Added items to the todo list.

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 3.20)
 
 # Use the fancy version substitution
-project(cmake-cpputest-template
+project(template
     VERSION 1.0
     DESCRIPTION "template for cmake + cpputest"
     LANGUAGES   C CXX
@@ -53,7 +53,6 @@ if (UNIT_TESTING)
     
     include_directories(
         ${CPPUTEST_INCLUDE_DIRS}
-        /usr/include/c++/11/
         ./inc
         ./mocks
         )

README.md

@@ -0,0 +1,52 @@
+# CH32V20X TDD template
+
+## Description
+
+This is a TDD focused template that uses the cpputest testing harness and 
+CMAKE for the build system. The build system and testing is held together with
+the use of the `otto.sh` script.
+
+## Dependencies
+
+- CMAKE >= 3.20
+- CppUTest >= 3.8
+- Bash/Sh shell
+- wchisp and/or wlink(rust pgrm)
+
+
+## Hardware Specific
+
+Given this template targets the whole range of CH32V20X chips you will want
+to define their memory layout to reflect the chip you have chosen.
+
+## Using the template
+
+### Change project configuration
+
+*Basic Steps:*
+1. Change project name parameter in `CMakeLists.txt` in root dir.
+2. Edit the memory layout file.
+
+
+### Setting up dependencies
+
+### Running Tests
+
+```sh
+echo "1" | ./otto.sh
+```
+
+### Building Binaries
+
+
+### Flashing Micro-Controller
+
+
+## TODO
+
+- [ ] check shared libraries build correctly.
+- [ ] check if all compile options are same for all parts.
+- [ ] Setup linker script inclusion.
+- [ ] Add flash target/command.
+- [ ] Add size target/command.
+- [ ] 

ch32v20x-toolchain.cmake

@@ -0,0 +1,68 @@
+# ###############################
+# CH32V20X toolchain file 
+# ###############################
+
+# Specify the cross-compiler
+set(CMAKE_SYSTEM_NAME Generic)
+set(CMAKE_SYSTEM_VERSION 1)
+set(CMAKE_SYSTEM_PROCESSOR riscv)
+
+set(MCU ch32v203)
+set(MARCH rv32imac)
+set(MABI ilp32)
+set(F_CPU 144000000UL)
+set(PROGRAMMER wlink)
+
+# Define the toolchain executables
+set(TRIPPLE riscv-none-elf)
+set(CMAKE_C_COMPILER ${TRIPPLE}-gcc)
+set(CMAKE_CXX_COMPILER ${TRIPPLE}-g++)
+set(CMAKE_ASM_COMPILER ${TRIPPLE}-gcc)
+set(CMAKE_LINKER ${TRIPPLE}-ld)
+set(CMAKE_OBJCOPY ${TRIPPLE}-objcopy)
+set(CMAKE_SIZE ${TRIPPLE}-size)
+
+# #####################################
+# Flags and Options for ELF building
+# #####################################
+
+#riscv-none-embed-gcc -march=rv32imac -mabi=ilp32 -msmall-data-limit=8 
+#-msave-restore -Os -fmessage-length=0 -fsigned-char -ffunction-sections 
+#-fdata-sections -fno-common -Wunused -Wuninitialized  
+#-g -T "/home/ronin/mrs_community-workspace/CH32V203K8T6/Ld/Link.ld" 
+#-nostartfiles -Xlinker --gc-sections -Wl,-Map,"CH32V203K8T6.map" 
+#--specs=nano.specs --specs=nosys.specs -o "CH32V203K8T6.elf" 
+#$(OBJS) $(USER_OBJS) $(LIBS)
+
+# #####################################
+# Building HEX file
+# #####################################
+
+#riscv-none-embed-objcopy -O ihex "CH32V203K8T6.elf"  "CH32V203K8T6.hex"
+
+# #####################################
+# LST building
+# #####################################
+
+#riscv-none-embed-objdump --all-headers --demangle --disassemble "CH32V203K8T6.elf" > "CH32V203K8T6.lst"
+
+# #####################################
+# Size building or CMD 
+# #####################################
+
+#riscv-none-embed-size --format=berkeley "CH32V203K8T6.elf"
+
+# Define compile options
+# Should check to see if parts are all compiled using same options
+set(CMAKE_C_FLAGS "-march=${MARCH} -mabi=${MABI} -msmall-data-limit=8\
+-msave-restore -Os -fmessage-length=0 -fsigned-char -ffunction-sections\
+-fdata-section -fno-common -Wunused -Wuninitialized -g\
+-T ./src/linker/Link.ld -nostartfiles -Xlinker --gc-sections -Wl\
+--specs=nano.sepcs --specs=nosys.specs
+") 
+set(CMAKE_CXX_FLAGS "-march=${MARCH}") 
+#set(CMAKE_EXE_LINKER_FLAGS_INIT "-mmcu=${AVR_MCU}")
+
+# Define the archiver and other tools
+set(CMAKE_AR ${TRIPPLE}-gcc-ar)
+set(CMAKE_RANLIB ${TRIPPLE}-gcc-ranlib)

src/CMakeLists.txt

@@ -1,3 +1,42 @@
-add_executable(main
-    main.c    
+# LOCATION: projectroot/src
+
+add_subdirectory(core)
+add_subdirectory(peripheral)
+add_subdirectory(system)
+add_subdirectory(startup)
+
+add_library(isr SHARED
+    ch32v20x_it.c     
+)
+
+add_executable(main
+    main.c 
+    ch32v20x_it.c
+)
+
+target_link_libraries(main 
+    core_riscv
+    system_ch32v20x 
+    debug
+    ch32v20x_adc 
+    ch32v20x_can
+    ch32v20x_dbgmcu
+    ch32v20x_exti
+    ch32v20x_gpio
+    ch32v20x_i2c
+    ch32v20x_misc
+    ch32v20x_pwr
+    ch32v20x_rtc
+    ch32v20x_tim
+    ch32v20x_usb
+    ch32v20x_bkp
+    ch32v20x_crc
+    ch32v20x_dma
+    ch32v20x_flash
+    ch32v20x_iwdg
+    ch32v20x_opa
+    ch32v20x_rcc
+    ch32v20x_spi
+    ch32v20x_usart
+    ch32v20x_wwdg
 )

src/ch32v20x_conf.h

@@ -0,0 +1,42 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_conf.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : Library configuration file.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_CONF_H
+#define __CH32V20x_CONF_H
+
+#include "ch32v20x_adc.h"
+#include "ch32v20x_bkp.h"
+#include "ch32v20x_can.h"
+#include "ch32v20x_crc.h"
+#include "ch32v20x_dbgmcu.h"
+#include "ch32v20x_dma.h"
+#include "ch32v20x_exti.h"
+#include "ch32v20x_flash.h"
+#include "ch32v20x_gpio.h"
+#include "ch32v20x_i2c.h"
+#include "ch32v20x_iwdg.h"
+#include "ch32v20x_pwr.h"
+#include "ch32v20x_rcc.h"
+#include "ch32v20x_rtc.h"
+#include "ch32v20x_spi.h"
+#include "ch32v20x_tim.h"
+#include "ch32v20x_usart.h"
+#include "ch32v20x_wwdg.h"
+#include "ch32v20x_it.h"
+#include "ch32v20x_misc.h"
+
+
+#endif /* __CH32V20x_CONF_H */
+
+
+	
+	
+	

src/ch32v20x_it.c

@@ -0,0 +1,46 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_it.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2023/12/29
+ * Description        : Main Interrupt Service Routines.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_it.h"
+
+void NMI_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
+void HardFault_Handler(void) __attribute__((interrupt("WCH-Interrupt-fast")));
+
+/*********************************************************************
+ * @fn      NMI_Handler
+ *
+ * @brief   This function handles NMI exception.
+ *
+ * @return  none
+ */
+void NMI_Handler(void)
+{
+  while (1)
+  {
+  }
+}
+
+/*********************************************************************
+ * @fn      HardFault_Handler
+ *
+ * @brief   This function handles Hard Fault exception.
+ *
+ * @return  none
+ */
+void HardFault_Handler(void)
+{
+  NVIC_SystemReset();
+  while (1)
+  {
+  }
+}
+
+

src/ch32v20x_it.h

@@ -0,0 +1,20 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_it.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains the headers of the interrupt handlers.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_IT_H
+#define __CH32V20x_IT_H
+
+#include "debug.h"
+
+
+#endif /* __CH32V20x_IT_H */
+
+

src/core/CMakeLists.txt

@@ -0,0 +1,8 @@
+# LOCATION: projectroot/src/core
+
+#Example/template lines.
+add_library(core_riscv SHARED
+    core_riscv.c
+)
+
+target_include_directories(core_riscv PUBLIC ./inc)

src/core/core_riscv.c

@@ -0,0 +1,306 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : core_riscv.c
+ * Author             : WCH
+ * Version            : V1.0.1
+ * Date               : 2023/11/11
+ * Description        : RISC-V V4 Core Peripheral Access Layer Source File for CH32V20x
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include <stdint.h>
+
+/* define compiler specific symbols */
+#if defined ( __CC_ARM   )
+  #define __ASM            __asm                                      /* asm keyword for ARM Compiler          */
+  #define __INLINE         __inline                                   /* inline keyword for ARM Compiler       */
+
+#elif defined ( __ICCARM__ )
+  #define __ASM           __asm                                       /* asm keyword for IAR Compiler          */
+  #define __INLINE        inline                                      /* inline keyword for IAR Compiler. Only avaiable in High optimization mode */
+
+#elif defined   (  __GNUC__  )
+  #define __ASM            __asm                                      /* asm keyword for GNU Compiler          */
+  #define __INLINE         inline                                     /* inline keyword for GNU Compiler       */
+
+#elif defined   (  __TASKING__  )
+  #define __ASM            __asm                                      /* asm keyword for TASKING Compiler      */
+  #define __INLINE         inline                                     /* inline keyword for TASKING Compiler   */
+
+#endif
+
+
+
+/*********************************************************************
+ * @fn      __get_MSTATUS
+ *
+ * @brief   Return the Machine Status Register
+ *
+ * @return  mstatus value
+ */
+uint32_t __get_MSTATUS(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mstatus" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_MSTATUS
+ *
+ * @brief   Set the Machine Status Register
+ *
+ * @param   value  - set mstatus value
+ *
+ * @return  none
+ */
+void __set_MSTATUS(uint32_t value)
+{
+  __ASM volatile ("csrw mstatus, %0" : : "r" (value) );
+}
+
+/*********************************************************************
+ * @fn      __get_MISA
+ *
+ * @brief   Return the Machine ISA Register
+ *
+ * @return  misa value
+ */
+uint32_t __get_MISA(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "misa" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_MISA
+ *
+ * @brief   Set the Machine ISA Register
+ *
+ * @param   value  - set misa value
+ *
+ * @return  none
+ */
+void __set_MISA(uint32_t value)
+{
+  __ASM volatile ("csrw misa, %0" : : "r" (value) );
+}
+
+/*********************************************************************
+ * @fn      __get_MTVEC
+ *
+ * @brief   Return the Machine Trap-Vector Base-Address Register
+ *
+ * @return  mtvec value
+ */
+uint32_t __get_MTVEC(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mtvec" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_MTVEC
+ *
+ * @brief   Set the Machine Trap-Vector Base-Address Register
+ *
+ * @param   value  - set mtvec value
+ *
+ * @return  none
+ */
+void __set_MTVEC(uint32_t value)
+{
+  __ASM volatile ("csrw mtvec, %0" : : "r" (value) );
+}
+
+/*********************************************************************
+ * @fn      __get_MSCRATCH
+ *
+ * @brief   Return the Machine Seratch Register
+ *
+ * @return  mscratch value
+ */
+uint32_t __get_MSCRATCH(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mscratch" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_MSCRATCH
+ *
+ * @brief   Set the Machine Seratch Register
+ *
+ * @param   value  - set mscratch value
+ *
+ * @return  none
+ */
+void __set_MSCRATCH(uint32_t value)
+{
+  __ASM volatile ("csrw mscratch, %0" : : "r" (value) );
+}
+
+/*********************************************************************
+ * @fn      __get_MEPC
+ *
+ * @brief   Return the Machine Exception Program Register
+ *
+ * @return  mepc value
+ */
+uint32_t __get_MEPC(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mepc" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_MEPC
+ *
+ * @brief   Set the Machine Exception Program Register
+ *
+ * @return  mepc value
+ */
+void __set_MEPC(uint32_t value)
+{
+  __ASM volatile ("csrw mepc, %0" : : "r" (value) );
+}
+
+/*********************************************************************
+ * @fn      __get_MCAUSE
+ *
+ * @brief   Return the Machine Cause Register
+ *
+ * @return  mcause value
+ */
+uint32_t __get_MCAUSE(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mcause" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_MEPC
+ *
+ * @brief   Set the Machine Cause Register
+ *
+ * @return  mcause value
+ */
+void __set_MCAUSE(uint32_t value)
+{
+  __ASM volatile ("csrw mcause, %0" : : "r" (value) );
+}
+
+/*********************************************************************
+ * @fn      __get_MTVAL
+ *
+ * @brief   Return the Machine Trap Value Register
+ *
+ * @return  mtval value
+ */
+uint32_t __get_MTVAL(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mtval" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_MTVAL
+ *
+ * @brief   Set the Machine Trap Value Register
+ *
+ * @return  mtval value
+ */
+void __set_MTVAL(uint32_t value)
+{
+  __ASM volatile ("csrw mtval, %0" : : "r" (value) );
+}
+
+/*********************************************************************
+ * @fn      __get_MVENDORID
+ *
+ * @brief   Return Vendor ID Register
+ *
+ * @return  mvendorid value
+ */
+uint32_t __get_MVENDORID(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mvendorid" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __get_MARCHID
+ *
+ * @brief   Return Machine Architecture ID Register
+ *
+ * @return  marchid value
+ */
+uint32_t __get_MARCHID(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "marchid" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __get_MIMPID
+ *
+ * @brief   Return Machine Implementation ID Register
+ *
+ * @return  mimpid value
+ */
+uint32_t __get_MIMPID(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mimpid" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __get_MHARTID
+ *
+ * @brief   Return Hart ID Register
+ *
+ * @return  mhartid value
+ */
+uint32_t __get_MHARTID(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "csrr %0," "mhartid" : "=r" (result) );
+  return (result);
+}
+
+/*********************************************************************
+ * @fn      __get_SP
+ *
+ * @brief   Return SP Register
+ *
+ * @return  SP value
+ */
+uint32_t __get_SP(void)
+{
+  uint32_t result;
+
+  __ASM volatile ( "mv %0," "sp" : "=r"(result) : );
+  return (result);
+}
+

src/core/core_riscv.h

@@ -0,0 +1,589 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : core_riscv.h
+ * Author             : WCH
+ * Version            : V1.0.1
+ * Date               : 2023/11/11
+ * Description        : RISC-V V4 Core Peripheral Access Layer Header File for CH32V20x
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CORE_RISCV_H__
+#define __CORE_RISCV_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* IO definitions */
+#ifdef __cplusplus
+  #define     __I     volatile                /*  defines 'read only' permissions      */
+#else
+  #define     __I     volatile const          /*  defines 'read only' permissions     */
+#endif
+#define       __O     volatile                /*  defines 'write only' permissions     */
+#define       __IO    volatile                /*  defines 'read / write' permissions   */
+
+/* Standard Peripheral Library old types (maintained for legacy purpose) */
+typedef __I uint64_t vuc64;   /* Read Only */
+typedef __I uint32_t vuc32;   /* Read Only */
+typedef __I uint16_t vuc16;   /* Read Only */
+typedef __I uint8_t  vuc8;    /* Read Only */
+
+typedef const uint64_t uc64;  /* Read Only */
+typedef const uint32_t uc32;  /* Read Only */
+typedef const uint16_t uc16;  /* Read Only */
+typedef const uint8_t  uc8;   /* Read Only */
+
+typedef __I int64_t vsc64;    /* Read Only */
+typedef __I int32_t vsc32;    /* Read Only */
+typedef __I int16_t vsc16;    /* Read Only */
+typedef __I int8_t  vsc8;     /* Read Only */
+
+typedef const int64_t sc64;   /* Read Only */
+typedef const int32_t sc32;   /* Read Only */
+typedef const int16_t sc16;   /* Read Only */
+typedef const int8_t  sc8;    /* Read Only */
+
+typedef __IO uint64_t  vu64;
+typedef __IO uint32_t  vu32;
+typedef __IO uint16_t  vu16;
+typedef __IO uint8_t   vu8;
+
+typedef uint64_t  u64;
+typedef uint32_t  u32;
+typedef uint16_t  u16;
+typedef uint8_t   u8;
+
+typedef __IO int64_t  vs64;
+typedef __IO int32_t  vs32;
+typedef __IO int16_t  vs16;
+typedef __IO int8_t   vs8;
+
+typedef int64_t  s64;
+typedef int32_t  s32;
+typedef int16_t  s16;
+typedef int8_t   s8;
+
+typedef enum {NoREADY = 0, READY = !NoREADY} ErrorStatus;
+
+typedef enum {DISABLE = 0, ENABLE = !DISABLE} FunctionalState;
+
+typedef enum {RESET = 0, SET = !RESET} FlagStatus, ITStatus;
+
+#define   RV_STATIC_INLINE  static  inline
+
+/* memory mapped structure for Program Fast Interrupt Controller (PFIC) */
+typedef struct{
+  __I  uint32_t ISR[8];
+  __I  uint32_t IPR[8];
+  __IO uint32_t ITHRESDR;
+  __IO uint32_t RESERVED;
+  __IO uint32_t CFGR;
+  __I  uint32_t GISR;
+  __IO uint8_t VTFIDR[4];
+  uint8_t RESERVED0[12];
+  __IO uint32_t VTFADDR[4];
+  uint8_t RESERVED1[0x90];
+  __O  uint32_t IENR[8];
+  uint8_t RESERVED2[0x60];
+  __O  uint32_t IRER[8];
+  uint8_t RESERVED3[0x60];
+  __O  uint32_t IPSR[8];
+  uint8_t RESERVED4[0x60];
+  __O  uint32_t IPRR[8];
+  uint8_t RESERVED5[0x60];
+  __IO uint32_t IACTR[8];
+  uint8_t RESERVED6[0xE0];
+  __IO uint8_t IPRIOR[256];
+  uint8_t RESERVED7[0x810];
+  __IO uint32_t SCTLR;
+}PFIC_Type;
+
+/* memory mapped structure for SysTick */
+typedef struct
+{
+    __IO uint32_t CTLR;
+    __IO uint32_t SR;
+    __IO uint64_t CNT;
+    __IO uint64_t CMP;
+}SysTick_Type;
+
+
+#define PFIC            ((PFIC_Type *) 0xE000E000 )
+#define NVIC            PFIC
+#define NVIC_KEY1       ((uint32_t)0xFA050000)
+#define	NVIC_KEY2		((uint32_t)0xBCAF0000)
+#define	NVIC_KEY3		((uint32_t)0xBEEF0000)
+
+#define SysTick         ((SysTick_Type *) 0xE000F000)
+
+
+/*********************************************************************
+ * @fn      __enable_irq
+ *
+ * @brief   Enable Global Interrupt
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void __enable_irq()
+{
+  __asm volatile ("csrs 0x800, %0" : : "r" (0x88) );
+}
+
+/*********************************************************************
+ * @fn      __disable_irq
+ *
+ * @brief   Disable Global Interrupt
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void __disable_irq()
+{
+  __asm volatile ("csrc 0x800, %0" : : "r" (0x88) );
+}
+
+/*********************************************************************
+ * @fn      __NOP
+ *
+ * @brief   nop
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void __NOP()
+{
+  __asm volatile ("nop");
+}
+
+/*********************************************************************
+ * @fn      NVIC_EnableIRQ
+ *
+ * @brief   Enable Interrupt
+ *
+ * @param   IRQn - Interrupt Numbers
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void NVIC_EnableIRQ(IRQn_Type IRQn)
+{
+  NVIC->IENR[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F));
+}
+
+/*********************************************************************
+ * @fn      NVIC_DisableIRQ
+ *
+ * @brief   Disable Interrupt
+ *
+ * @param   IRQn - Interrupt Numbers
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void NVIC_DisableIRQ(IRQn_Type IRQn)
+{
+  NVIC->IRER[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F));
+}
+
+/*********************************************************************
+ * @fn      NVIC_GetStatusIRQ
+ *
+ * @brief   Get Interrupt Enable State
+ *
+ * @param   IRQn - Interrupt Numbers
+ *
+ * @return  1 - Interrupt Pending Enable
+ *          0 - Interrupt Pending Disable
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE uint32_t NVIC_GetStatusIRQ(IRQn_Type IRQn)
+{
+  return((uint32_t) ((NVIC->ISR[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F)))?1:0));
+}
+
+/*********************************************************************
+ * @fn      NVIC_GetPendingIRQ
+ *
+ * @brief   Get Interrupt Pending State
+ *
+ * @param   IRQn - Interrupt Numbers
+ *
+ * @return  1 - Interrupt Pending Enable
+ *          0 - Interrupt Pending Disable
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE uint32_t NVIC_GetPendingIRQ(IRQn_Type IRQn)
+{
+  return((uint32_t) ((NVIC->IPR[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F)))?1:0));
+}
+
+/*********************************************************************
+ * @fn      NVIC_SetPendingIRQ
+ *
+ * @brief   Set Interrupt Pending
+ *
+ * @param   IRQn - Interrupt Numbers
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void NVIC_SetPendingIRQ(IRQn_Type IRQn)
+{
+  NVIC->IPSR[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F));
+}
+
+/*********************************************************************
+ * @fn      NVIC_ClearPendingIRQ
+ *
+ * @brief   Clear Interrupt Pending
+ *
+ * @param   IRQn - Interrupt Numbers
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void NVIC_ClearPendingIRQ(IRQn_Type IRQn)
+{
+  NVIC->IPRR[((uint32_t)(IRQn) >> 5)] = (1 << ((uint32_t)(IRQn) & 0x1F));
+}
+
+/*********************************************************************
+ * @fn      NVIC_GetActive
+ *
+ * @brief   Get Interrupt Active State
+ *
+ * @param   IRQn - Interrupt Numbers
+ *
+ * @return  1 - Interrupt Active
+ *          0 - Interrupt No Active
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE uint32_t NVIC_GetActive(IRQn_Type IRQn)
+{
+  return((uint32_t)((NVIC->IACTR[(uint32_t)(IRQn) >> 5] & (1 << ((uint32_t)(IRQn) & 0x1F)))?1:0));
+}
+
+/*********************************************************************
+ * @fn      NVIC_SetPriority
+ *
+ * @brief   Set Interrupt Priority
+ *
+ * @param   IRQn - Interrupt Numbers
+ *          interrupt nesting enable(CSR-0x804 bit1 = 1)
+ *            priority - bit[7] - Preemption Priority
+ *                       bit[6:5] - Sub priority
+ *                       bit[4:0] - Reserve
+ *          interrupt nesting disable(CSR-0x804 bit1 = 0)
+ *            priority - bit[7:5] - Sub priority
+ *                       bit[4:0] - Reserve
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void NVIC_SetPriority(IRQn_Type IRQn, uint8_t priority)
+{
+  NVIC->IPRIOR[(uint32_t)(IRQn)] = priority;
+}
+
+/*********************************************************************
+ * @fn      __WFI
+ *
+ * @brief   Wait for Interrupt
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void __WFI(void)
+{
+  NVIC->SCTLR &= ~(1<<3);	// wfi
+  asm volatile ("wfi");
+}
+
+/*********************************************************************
+ * @fn      _SEV
+ *
+ * @brief   Set Event
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void _SEV(void)
+{
+  NVIC->SCTLR |= (1<<5);
+}
+
+/*********************************************************************
+ * @fn      _WFE
+ *
+ * @brief   Wait for Events
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void _WFE(void)
+{
+    uint32_t tmp= NVIC->SCTLR;
+    tmp &= ~(1<<5);
+    tmp |= (1<<3);
+    NVIC->SCTLR = tmp;
+    asm volatile ("wfi");
+}
+
+/*********************************************************************
+ * @fn      __WFE
+ *
+ * @brief   Wait for Events
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void __WFE(void)
+{
+  _SEV();
+  _WFE();
+  _WFE();
+  if(*(vu32*)(0x40023800) & (1<<6))
+  {
+    NVIC->SCTLR |= (1<<5);
+  }
+}
+
+/*********************************************************************
+ * @fn      SetVTFIRQ
+ *
+ * @brief   Set VTF Interrupt
+ *
+ * @param   addr - VTF interrupt service function base address.
+ *          IRQn - Interrupt Numbers
+ *          num - VTF Interrupt Numbers
+ *          NewState - DISABLE or ENABLE
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void SetVTFIRQ(uint32_t addr, IRQn_Type IRQn, uint8_t num, FunctionalState NewState)
+{
+  if(num > 3)  return ;
+
+  if (NewState != DISABLE)
+  {
+      NVIC->VTFIDR[num] = IRQn;
+      NVIC->VTFADDR[num] = ((addr&0xFFFFFFFE)|0x1);
+  }
+  else
+  {
+      NVIC->VTFIDR[num] = IRQn;
+      NVIC->VTFADDR[num] = ((addr&0xFFFFFFFE)&(~0x1));
+  }
+}
+
+/*********************************************************************
+ * @fn      NVIC_SystemReset
+ *
+ * @brief   Initiate a system reset request
+ *
+ * @return  none
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE void NVIC_SystemReset(void)
+{
+  NVIC->CFGR = NVIC_KEY3|(1<<7);
+}
+
+/*********************************************************************
+ * @fn      __AMOADD_W
+ *   
+ * @brief   Atomic Add with 32bit value
+ *          Atomically ADD 32bit value with value in memory using amoadd.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be ADDed
+ *
+ * @return  return memory value + add value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE int32_t __AMOADD_W(volatile int32_t *addr, int32_t value)
+{
+    int32_t result;
+
+    __asm volatile ("amoadd.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/*********************************************************************
+ * @fn      __AMOAND_W
+ *
+ * @brief   Atomic And with 32bit value
+ *          Atomically AND 32bit value with value in memory using amoand.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be ANDed
+ *
+ * @return  return memory value & and value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE int32_t __AMOAND_W(volatile int32_t *addr, int32_t value)
+{
+    int32_t result;
+
+    __asm volatile ("amoand.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/*********************************************************************
+ * @fn      __AMOMAX_W
+ *
+ * @brief   Atomic signed MAX with 32bit value
+ *          Atomically signed max compare 32bit value with value in memory using amomax.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be compared
+ *
+ * @return  the bigger value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE int32_t __AMOMAX_W(volatile int32_t *addr, int32_t value)
+{
+    int32_t result;
+
+    __asm volatile ("amomax.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/*********************************************************************
+ * @fn      __AMOMAXU_W
+ *
+ * @brief   Atomic unsigned MAX with 32bit value
+ *          Atomically unsigned max compare 32bit value with value in memory using amomaxu.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be compared
+ *             
+ * @return  return the bigger value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE uint32_t __AMOMAXU_W(volatile uint32_t *addr, uint32_t value)
+{
+    uint32_t result;
+
+    __asm volatile ("amomaxu.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/*********************************************************************
+ * @fn      __AMOMIN_W
+ *
+ * @brief   Atomic signed MIN with 32bit value
+ *          Atomically signed min compare 32bit value with value in memory using amomin.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be compared
+ *
+ * @return  the smaller value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE int32_t __AMOMIN_W(volatile int32_t *addr, int32_t value)
+{
+    int32_t result;
+
+    __asm volatile ("amomin.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/*********************************************************************
+ * @fn      __AMOMINU_W
+ *
+ * @brief   Atomic unsigned MIN with 32bit value
+ *          Atomically unsigned min compare 32bit value with value in memory using amominu.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be compared
+ *
+ * @return  the smaller value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE uint32_t __AMOMINU_W(volatile uint32_t *addr, uint32_t value)
+{
+    uint32_t result;
+
+    __asm volatile ("amominu.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/*********************************************************************
+ * @fn      __AMOOR_W
+ *  
+ * @brief   Atomic OR with 32bit value
+ *          Atomically OR 32bit value with value in memory using amoor.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be ORed
+ * 
+ * @return  return memory value | and value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE int32_t __AMOOR_W(volatile int32_t *addr, int32_t value)
+{
+    int32_t result;
+
+    __asm volatile ("amoor.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/*********************************************************************
+ * @fn      __AMOSWAP_W
+ *
+ * @brief   Atomically swap new 32bit value into memory using amoswap.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          newval - New value to be stored into the address
+ *
+ * @return  return the original value in memory
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE uint32_t __AMOSWAP_W(volatile uint32_t *addr, uint32_t newval)
+{
+    uint32_t result;
+
+    __asm volatile ("amoswap.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(newval) : "memory");
+    return result;
+}
+
+/*********************************************************************
+ * @fn      __AMOXOR_W
+ *
+ * @brief   Atomic XOR with 32bit value
+ *          Atomically XOR 32bit value with value in memory using amoxor.d.
+ *
+ * @param   addr - Address pointer to data, address need to be 4byte aligned
+ *          value - value to be XORed
+ *
+ * @return  return memory value ^ and value
+ */
+__attribute__( ( always_inline ) ) RV_STATIC_INLINE int32_t __AMOXOR_W(volatile int32_t *addr, int32_t value)
+{
+    int32_t result;
+
+    __asm volatile ("amoxor.w %0, %2, %1" : \
+            "=r"(result), "+A"(*addr) : "r"(value) : "memory");
+    return *addr;
+}
+
+/* Core_Exported_Functions */  
+extern uint32_t __get_MSTATUS(void);
+extern void __set_MSTATUS(uint32_t value);
+extern uint32_t __get_MISA(void);
+extern void __set_MISA(uint32_t value);
+extern uint32_t __get_MTVEC(void);
+extern void __set_MTVEC(uint32_t value);
+extern uint32_t __get_MSCRATCH(void);
+extern void __set_MSCRATCH(uint32_t value);
+extern uint32_t __get_MEPC(void);
+extern void __set_MEPC(uint32_t value);
+extern uint32_t __get_MCAUSE(void);
+extern void __set_MCAUSE(uint32_t value);
+extern uint32_t __get_MTVAL(void);
+extern void __set_MTVAL(uint32_t value);
+extern uint32_t __get_MVENDORID(void);
+extern uint32_t __get_MARCHID(void);
+extern uint32_t __get_MIMPID(void);
+extern uint32_t __get_MHARTID(void);
+extern uint32_t __get_SP(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+
+
+
+

src/debug/CMakeLists.txt

@@ -0,0 +1,8 @@
+# LOCATION: projectroot/src/debug
+
+add_library(debug SHARED
+    debug.c
+)
+
+target_include_directories(debug PUBLIC ./)
+

src/debug/debug.c

@@ -0,0 +1,191 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : debug.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for UART
+ *                      Printf , Delay functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "debug.h"
+
+static uint8_t  p_us = 0;
+static uint16_t p_ms = 0;
+/*********************************************************************
+ * @fn      Delay_Init
+ *
+ * @brief   Initializes Delay Funcation.
+ *
+ * @return  none
+ */
+void Delay_Init(void)
+{
+    p_us = SystemCoreClock / 8000000;
+    p_ms = (uint16_t)p_us * 1000;
+}
+
+/*********************************************************************
+ * @fn      Delay_Us
+ *
+ * @brief   Microsecond Delay Time.
+ *
+ * @param   n - Microsecond number.
+ *
+ * @return  None
+ */
+void Delay_Us(uint32_t n)
+{
+    uint32_t i;
+
+    SysTick->SR &= ~(1 << 0);
+    i = (uint32_t)n * p_us;
+
+    SysTick->CMP = i;
+    SysTick->CTLR |= (1 << 4);
+    SysTick->CTLR |= (1 << 5) | (1 << 0);
+
+    while((SysTick->SR & (1 << 0)) != (1 << 0));
+    SysTick->CTLR &= ~(1 << 0);
+}
+
+/*********************************************************************
+ * @fn      Delay_Ms
+ *
+ * @brief   Millisecond Delay Time.
+ *
+ * @param   n - Millisecond number.
+ *
+ * @return  None
+ */
+void Delay_Ms(uint32_t n)
+{
+    uint32_t i;
+
+    SysTick->SR &= ~(1 << 0);
+    i = (uint32_t)n * p_ms;
+
+    SysTick->CMP = i;
+    SysTick->CTLR |= (1 << 4);
+    SysTick->CTLR |= (1 << 5) | (1 << 0);
+
+    while((SysTick->SR & (1 << 0)) != (1 << 0));
+    SysTick->CTLR &= ~(1 << 0);
+}
+
+/*********************************************************************
+ * @fn      USART_Printf_Init
+ *
+ * @brief   Initializes the USARTx peripheral.
+ *
+ * @param   baudrate - USART communication baud rate.
+ *
+ * @return  None
+ */
+void USART_Printf_Init(uint32_t baudrate)
+{
+    GPIO_InitTypeDef  GPIO_InitStructure;
+    USART_InitTypeDef USART_InitStructure;
+
+#if(DEBUG == DEBUG_UART1)
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
+
+    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+    GPIO_Init(GPIOA, &GPIO_InitStructure);
+
+#elif(DEBUG == DEBUG_UART2)
+    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
+
+    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+    GPIO_Init(GPIOA, &GPIO_InitStructure);
+
+#elif(DEBUG == DEBUG_UART3)
+    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
+
+    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
+    GPIO_Init(GPIOB, &GPIO_InitStructure);
+
+#endif
+
+    USART_InitStructure.USART_BaudRate = baudrate;
+    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+    USART_InitStructure.USART_StopBits = USART_StopBits_1;
+    USART_InitStructure.USART_Parity = USART_Parity_No;
+    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+    USART_InitStructure.USART_Mode = USART_Mode_Tx;
+
+#if(DEBUG == DEBUG_UART1)
+    USART_Init(USART1, &USART_InitStructure);
+    USART_Cmd(USART1, ENABLE);
+
+#elif(DEBUG == DEBUG_UART2)
+    USART_Init(USART2, &USART_InitStructure);
+    USART_Cmd(USART2, ENABLE);
+
+#elif(DEBUG == DEBUG_UART3)
+    USART_Init(USART3, &USART_InitStructure);
+    USART_Cmd(USART3, ENABLE);
+
+#endif
+}
+
+/*********************************************************************
+ * @fn      _write
+ *
+ * @brief   Support Printf Function
+ *
+ * @param   *buf - UART send Data.
+ *          size - Data length
+ *
+ * @return  size: Data length
+ */
+__attribute__((used))
+int _write(int fd, char *buf, int size)
+{
+    int i;
+
+    for(i = 0; i < size; i++){
+#if(DEBUG == DEBUG_UART1)
+        while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
+        USART_SendData(USART1, *buf++);
+#elif(DEBUG == DEBUG_UART2)
+        while(USART_GetFlagStatus(USART2, USART_FLAG_TC) == RESET);
+        USART_SendData(USART2, *buf++);
+#elif(DEBUG == DEBUG_UART3)
+        while(USART_GetFlagStatus(USART3, USART_FLAG_TC) == RESET);
+        USART_SendData(USART3, *buf++);
+#endif
+    }
+
+    return size;
+}
+
+/*********************************************************************
+ * @fn      _sbrk
+ *
+ * @brief   Change the spatial position of data segment.
+ *
+ * @return  size: Data length
+ */
+void *_sbrk(ptrdiff_t incr)
+{
+    extern char _end[];
+    extern char _heap_end[];
+    static char *curbrk = _end;
+
+    if ((curbrk + incr < _end) || (curbrk + incr > _heap_end))
+    return NULL - 1;
+
+    curbrk += incr;
+    return curbrk - incr;
+}

src/debug/debug.h

@@ -0,0 +1,48 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : debug.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for UART
+ *                      Printf , Delay functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __DEBUG_H
+#define __DEBUG_H
+
+#include "stdio.h"
+#include "ch32v20x.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* UART Printf Definition */
+#define DEBUG_UART1    1
+#define DEBUG_UART2    2
+#define DEBUG_UART3    3
+
+/* DEBUG UATR Definition */
+#ifndef DEBUG
+#define DEBUG   DEBUG_UART1
+#endif
+
+void Delay_Init(void);
+void Delay_Us(uint32_t n);
+void Delay_Ms(uint32_t n);
+void USART_Printf_Init(uint32_t baudrate);
+
+#if(DEBUG)
+  #define PRINT(format, ...)    printf(format, ##__VA_ARGS__)
+#else
+  #define PRINT(X...)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/linker/Link.ld

@@ -0,0 +1 @@
+ENTRY( _start )

__stack_size = 2048;

PROVIDE( _stack_size = __stack_size );


MEMORY
{  
/* CH32V20x_D6 - CH32V203F6-CH32V203G6-CH32V203C6 */
/*
	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 32K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 10K
*/

/* CH32V20x_D6 - CH32V203K8-CH32V203C8-CH32V203G8-CH32V203F8 */
	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 64K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 20K

  
/* CH32V20x_D8 - CH32V203RB
   CH32V20x_D8W - CH32V208x
   FLASH + RAM supports the following configuration
   FLASH-128K + RAM-64K
   FLASH-144K + RAM-48K
   FLASH-160K + RAM-32K
*/
/*
	FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 160K
	RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 32K
*/

}


SECTIONS
{

	.init :
	{
		_sinit = .;
		. = ALIGN(4);
		KEEP(*(SORT_NONE(.init)))
		. = ALIGN(4);
		_einit = .;
	} >FLASH AT>FLASH

  .vector :
  {
      *(.vector);
	  . = ALIGN(64);
  } >FLASH AT>FLASH

	.text :
	{
		. = ALIGN(4);
		*(.text)
		*(.text.*)
		*(.rodata)
		*(.rodata*)
		*(.gnu.linkonce.t.*)
		. = ALIGN(4);
	} >FLASH AT>FLASH 

	.fini :
	{
		KEEP(*(SORT_NONE(.fini)))
		. = ALIGN(4);
	} >FLASH AT>FLASH

	PROVIDE( _etext = . );
	PROVIDE( _eitcm = . );	

	.preinit_array  :
	{
	  PROVIDE_HIDDEN (__preinit_array_start = .);
	  KEEP (*(.preinit_array))
	  PROVIDE_HIDDEN (__preinit_array_end = .);
	} >FLASH AT>FLASH 
	
	.init_array     :
	{
	  PROVIDE_HIDDEN (__init_array_start = .);
	  KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
	  KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
	  PROVIDE_HIDDEN (__init_array_end = .);
	} >FLASH AT>FLASH 
	
	.fini_array     :
	{
	  PROVIDE_HIDDEN (__fini_array_start = .);
	  KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
	  KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
	  PROVIDE_HIDDEN (__fini_array_end = .);
	} >FLASH AT>FLASH 
	
	.ctors          :
	{
	  /* gcc uses crtbegin.o to find the start of
	     the constructors, so we make sure it is
	     first.  Because this is a wildcard, it
	     doesn't matter if the user does not
	     actually link against crtbegin.o; the
	     linker won't look for a file to match a
	     wildcard.  The wildcard also means that it
	     doesn't matter which directory crtbegin.o
	     is in.  */
	  KEEP (*crtbegin.o(.ctors))
	  KEEP (*crtbegin?.o(.ctors))
	  /* We don't want to include the .ctor section from
	     the crtend.o file until after the sorted ctors.
	     The .ctor section from the crtend file contains the
	     end of ctors marker and it must be last */
	  KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
	  KEEP (*(SORT(.ctors.*)))
	  KEEP (*(.ctors))
	} >FLASH AT>FLASH 
	
	.dtors          :
	{
	  KEEP (*crtbegin.o(.dtors))
	  KEEP (*crtbegin?.o(.dtors))
	  KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
	  KEEP (*(SORT(.dtors.*)))
	  KEEP (*(.dtors))
	} >FLASH AT>FLASH 

	.dalign :
	{
		. = ALIGN(4);
		PROVIDE(_data_vma = .);
	} >RAM AT>FLASH	

	.dlalign :
	{
		. = ALIGN(4); 
		PROVIDE(_data_lma = .);
	} >FLASH AT>FLASH

	.data :
	{
    	*(.gnu.linkonce.r.*)
    	*(.data .data.*)
    	*(.gnu.linkonce.d.*)
		. = ALIGN(8);
    	PROVIDE( __global_pointer$ = . + 0x800 );
    	*(.sdata .sdata.*)
		*(.sdata2.*)
    	*(.gnu.linkonce.s.*)
    	. = ALIGN(8);
    	*(.srodata.cst16)
    	*(.srodata.cst8)
    	*(.srodata.cst4)
    	*(.srodata.cst2)
    	*(.srodata .srodata.*)
    	. = ALIGN(4);
		PROVIDE( _edata = .);
	} >RAM AT>FLASH

	.bss :
	{
		. = ALIGN(4);
		PROVIDE( _sbss = .);
  	    *(.sbss*)
        *(.gnu.linkonce.sb.*)
		*(.bss*)
     	*(.gnu.linkonce.b.*)		
		*(COMMON*)
		. = ALIGN(4);
		PROVIDE( _ebss = .);
	} >RAM AT>FLASH

	PROVIDE( _end = _ebss);
	PROVIDE( end = . );

    .stack ORIGIN(RAM) + LENGTH(RAM) - __stack_size :
    {
        PROVIDE( _heap_end = . );   
        . = ALIGN(4);
        PROVIDE(_susrstack = . );
        . = . + __stack_size;
        PROVIDE( _eusrstack = .);
    } >RAM 

}

src/main.c

@@ -1,8 +1,44 @@
-#include "stdio.h"
+#include "debug.h"
 
-int main(int argc, char **argv)
+/* Global typedef */
+
+/* Global define */
+
+/* Global Variable */
+
+void GPIO_Toggle_INIT(void)
 {
-    printf("Hello!\n");
-    return 0;
+    GPIO_InitTypeDef GPIO_InitStructure = {0};
+
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
+    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
+    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
+    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
+    GPIO_Init(GPIOA, &GPIO_InitStructure);
+}
+
+/**
+ * @fn main
+ * @brief Main program
+ * @return none
+ */
+
+int main(void)
+{
+    u8 i = 0;
+
+    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
+    SystemCoreClockUpdate();
+    Delay_Init();
+    //USART_Printf_Init(115200);
+    //printf("SystemClk:%d\r\n", SystemCoreClock);
+    //printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
+    //printf("GPIO Toggle TEST\r\n");
+    GPIO_Toggle_INIT();
+
+    while(1)
+    {
+    	Delay_Ms(250);
+        GPIO_WriteBit(GPIOA, GPIO_Pin_1, (i == 0) ? (i = Bit_SET) : (i = Bit_RESET));
+    }
 }
-    

src/peripheral/CMakeLists.txt

@@ -0,0 +1,144 @@
+# LOCATION: projectroot/src/peripheral
+
+#Example/template lines.
+#add_library(ch32v20x_xxx SHARED
+#    src/ch32v20x_xxx.c
+#)
+#
+#target_include_directories(ch32v20x_xxx PUBLIC ./inc)
+
+
+
+add_library(ch32v20x_adc SHARED
+    src/ch32v20x_adc.c
+)
+target_include_directories(ch32v20x_adc PUBLIC ./inc)
+
+
+add_library(ch32v20x_can SHARED
+    src/ch32v20x_can.c
+)
+target_include_directories(ch32v20x_can PUBLIC ./inc)
+
+
+add_library(ch32v20x_dbgmcu SHARED
+    src/ch32v20x_dbgmcu.c
+)
+target_include_directories(ch32v20x_dbgmcu PUBLIC ./inc)
+
+
+add_library(ch32v20x_exti SHARED
+    src/ch32v20x_exti.c
+)
+target_include_directories(ch32v20x_exti PUBLIC ./inc)
+
+
+add_library(ch32v20x_gpio SHARED
+    src/ch32v20x_gpio.c
+)
+target_include_directories(ch32v20x_gpio PUBLIC ./inc)
+
+
+add_library(ch32v20x_i2c SHARED
+    src/ch32v20x_i2c.c
+)
+target_include_directories(ch32v20x_i2c PUBLIC ./inc)
+
+
+add_library(ch32v20x_misc SHARED
+    src/ch32v20x_misc.c
+)
+target_include_directories(ch32v20x_misc PUBLIC ./inc)
+
+
+add_library(ch32v20x_pwr SHARED
+    src/ch32v20x_pwr.c
+)
+target_include_directories(ch32v20x_pwr PUBLIC ./inc)
+
+
+add_library(ch32v20x_rtc SHARED
+    src/ch32v20x_rtc.c
+)
+target_include_directories(ch32v20x_rtc PUBLIC ./inc)
+
+
+add_library(ch32v20x_tim SHARED
+    src/ch32v20x_tim.c
+)
+target_include_directories(ch32v20x_tim PUBLIC ./inc)
+
+
+add_library(ch32v20x_usb SHARED
+    src/ch32v20x_usb.c
+)
+target_include_directories(ch32v20x_usb PUBLIC ./inc)
+
+
+add_library(ch32v20x_bkp SHARED
+    src/ch32v20x_bkp.c
+)
+target_include_directories(ch32v20x_bkp PUBLIC ./inc)
+
+
+add_library(ch32v20x_crc SHARED
+    src/ch32v20x_crc.c
+)
+target_include_directories(ch32v20x_crc PUBLIC ./inc)
+
+
+add_library(ch32v20x_dma SHARED
+    src/ch32v20x_dma.c
+)
+target_include_directories(ch32v20x_dma PUBLIC ./inc)
+
+
+add_library(ch32v20x_flash SHARED
+    src/ch32v20x_flash.c
+)
+target_include_directories(ch32v20x_flash PUBLIC ./inc)
+
+
+add_library(ch32v20x_iwdg SHARED
+    src/ch32v20x_iwdg.c
+)
+target_include_directories(ch32v20x_iwdg PUBLIC ./inc)
+
+
+add_library(ch32v20x_opa SHARED
+    src/ch32v20x_opa.c
+)
+target_include_directories(ch32v20x_opa PUBLIC ./inc)
+
+
+add_library(ch32v20x_rcc SHARED
+    src/ch32v20x_rcc.c
+)
+target_include_directories(ch32v20x_rcc PUBLIC ./inc)
+
+
+add_library(ch32v20x_spi SHARED
+    src/ch32v20x_spi.c
+)
+target_include_directories(ch32v20x_spi PUBLIC ./inc)
+
+
+add_library(ch32v20x_usart SHARED
+    src/ch32v20x_usart.c
+)
+target_include_directories(ch32v20x_usart PUBLIC ./inc)
+
+
+add_library(ch32v20x_wwdg SHARED
+    src/ch32v20x_wwdg.c
+)
+target_include_directories(ch32v20x_wwdg PUBLIC ./inc)
+
+
+# This one doesn't have source code.
+#target_include_directories(ch32v20x PUBLIC ./inc)
+#
+#add_library(ch32v20x SHARED
+#    src/ch32v20x.c
+#)
+

src/peripheral/inc/ch32v20x_adc.h

@@ -0,0 +1,220 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_adc.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      ADC firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_ADC_H
+#define __CH32V20x_ADC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* ADC Init structure definition */
+typedef struct
+{
+    uint32_t ADC_Mode; /* Configures the ADC to operate in independent or
+                          dual mode.
+                          This parameter can be a value of @ref ADC_mode */
+
+    FunctionalState ADC_ScanConvMode; /* Specifies whether the conversion is performed in
+                                         Scan (multichannels) or Single (one channel) mode.
+                                         This parameter can be set to ENABLE or DISABLE */
+
+    FunctionalState ADC_ContinuousConvMode; /* Specifies whether the conversion is performed in
+                                               Continuous or Single mode.
+                                               This parameter can be set to ENABLE or DISABLE. */
+
+    uint32_t ADC_ExternalTrigConv; /* Defines the external trigger used to start the analog
+                                      to digital conversion of regular channels. This parameter
+                                      can be a value of @ref ADC_external_trigger_sources_for_regular_channels_conversion */
+
+    uint32_t ADC_DataAlign; /* Specifies whether the ADC data alignment is left or right.
+                               This parameter can be a value of @ref ADC_data_align */
+
+    uint8_t ADC_NbrOfChannel; /* Specifies the number of ADC channels that will be converted
+                                   using the sequencer for regular channel group.
+                                   This parameter must range from 1 to 16. */
+
+    uint32_t ADC_OutputBuffer; /* Specifies whether the ADC channel output buffer is enabled or disabled.
+                                    This parameter can be a value of @ref ADC_OutputBuffer */
+
+    uint32_t ADC_Pga; /* Specifies the PGA gain multiple.
+                           This parameter can be a value of @ref ADC_Pga */
+} ADC_InitTypeDef;
+
+/* ADC_mode */
+#define ADC_Mode_Independent                           ((uint32_t)0x00000000)
+#define ADC_Mode_RegInjecSimult                        ((uint32_t)0x00010000)
+#define ADC_Mode_RegSimult_AlterTrig                   ((uint32_t)0x00020000)
+#define ADC_Mode_InjecSimult_FastInterl                ((uint32_t)0x00030000)
+#define ADC_Mode_InjecSimult_SlowInterl                ((uint32_t)0x00040000)
+#define ADC_Mode_InjecSimult                           ((uint32_t)0x00050000)
+#define ADC_Mode_RegSimult                             ((uint32_t)0x00060000)
+#define ADC_Mode_FastInterl                            ((uint32_t)0x00070000)
+#define ADC_Mode_SlowInterl                            ((uint32_t)0x00080000)
+#define ADC_Mode_AlterTrig                             ((uint32_t)0x00090000)
+
+/* ADC_external_trigger_sources_for_regular_channels_conversion */
+#define ADC_ExternalTrigConv_T1_CC1                    ((uint32_t)0x00000000)
+#define ADC_ExternalTrigConv_T1_CC2                    ((uint32_t)0x00020000)
+#define ADC_ExternalTrigConv_T2_CC2                    ((uint32_t)0x00060000)
+#define ADC_ExternalTrigConv_T3_TRGO                   ((uint32_t)0x00080000)
+#define ADC_ExternalTrigConv_T4_CC4                    ((uint32_t)0x000A0000)
+#define ADC_ExternalTrigConv_Ext_IT11_TIM8_TRGO        ((uint32_t)0x000C0000)
+
+#define ADC_ExternalTrigConv_T1_CC3                    ((uint32_t)0x00040000)
+#define ADC_ExternalTrigConv_None                      ((uint32_t)0x000E0000)
+
+#define ADC_ExternalTrigConv_T3_CC1                    ((uint32_t)0x00000000)
+#define ADC_ExternalTrigConv_T2_CC3                    ((uint32_t)0x00020000)
+#define ADC_ExternalTrigConv_T8_CC1                    ((uint32_t)0x00060000)
+#define ADC_ExternalTrigConv_T8_TRGO                   ((uint32_t)0x00080000)
+#define ADC_ExternalTrigConv_T5_CC1                    ((uint32_t)0x000A0000)
+#define ADC_ExternalTrigConv_T5_CC3                    ((uint32_t)0x000C0000)
+
+/* ADC_data_align */
+#define ADC_DataAlign_Right                            ((uint32_t)0x00000000)
+#define ADC_DataAlign_Left                             ((uint32_t)0x00000800)
+
+/* ADC_channels */
+#define ADC_Channel_0                                  ((uint8_t)0x00)
+#define ADC_Channel_1                                  ((uint8_t)0x01)
+#define ADC_Channel_2                                  ((uint8_t)0x02)
+#define ADC_Channel_3                                  ((uint8_t)0x03)
+#define ADC_Channel_4                                  ((uint8_t)0x04)
+#define ADC_Channel_5                                  ((uint8_t)0x05)
+#define ADC_Channel_6                                  ((uint8_t)0x06)
+#define ADC_Channel_7                                  ((uint8_t)0x07)
+#define ADC_Channel_8                                  ((uint8_t)0x08)
+#define ADC_Channel_9                                  ((uint8_t)0x09)
+#define ADC_Channel_10                                 ((uint8_t)0x0A)
+#define ADC_Channel_11                                 ((uint8_t)0x0B)
+#define ADC_Channel_12                                 ((uint8_t)0x0C)
+#define ADC_Channel_13                                 ((uint8_t)0x0D)
+#define ADC_Channel_14                                 ((uint8_t)0x0E)
+#define ADC_Channel_15                                 ((uint8_t)0x0F)
+#define ADC_Channel_16                                 ((uint8_t)0x10)
+#define ADC_Channel_17                                 ((uint8_t)0x11)
+
+#define ADC_Channel_TempSensor                         ((uint8_t)ADC_Channel_16)
+#define ADC_Channel_Vrefint                            ((uint8_t)ADC_Channel_17)
+
+/*ADC_output_buffer*/
+#define ADC_OutputBuffer_Enable                        ((uint32_t)0x04000000)
+#define ADC_OutputBuffer_Disable                       ((uint32_t)0x00000000)
+
+/*ADC_pga*/
+#define ADC_Pga_1                                      ((uint32_t)0x00000000)
+#define ADC_Pga_4                                      ((uint32_t)0x08000000)
+#define ADC_Pga_16                                     ((uint32_t)0x10000000)
+#define ADC_Pga_64                                     ((uint32_t)0x18000000)
+
+/* ADC_sampling_time */
+#define ADC_SampleTime_1Cycles5                        ((uint8_t)0x00)
+#define ADC_SampleTime_7Cycles5                        ((uint8_t)0x01)
+#define ADC_SampleTime_13Cycles5                       ((uint8_t)0x02)
+#define ADC_SampleTime_28Cycles5                       ((uint8_t)0x03)
+#define ADC_SampleTime_41Cycles5                       ((uint8_t)0x04)
+#define ADC_SampleTime_55Cycles5                       ((uint8_t)0x05)
+#define ADC_SampleTime_71Cycles5                       ((uint8_t)0x06)
+#define ADC_SampleTime_239Cycles5                      ((uint8_t)0x07)
+
+/* ADC_external_trigger_sources_for_injected_channels_conversion */
+#define ADC_ExternalTrigInjecConv_T2_TRGO              ((uint32_t)0x00002000)
+#define ADC_ExternalTrigInjecConv_T2_CC1               ((uint32_t)0x00003000)
+#define ADC_ExternalTrigInjecConv_T3_CC4               ((uint32_t)0x00004000)
+#define ADC_ExternalTrigInjecConv_T4_TRGO              ((uint32_t)0x00005000)
+#define ADC_ExternalTrigInjecConv_Ext_IT15_TIM8_CC4    ((uint32_t)0x00006000)
+
+#define ADC_ExternalTrigInjecConv_T1_TRGO              ((uint32_t)0x00000000)
+#define ADC_ExternalTrigInjecConv_T1_CC4               ((uint32_t)0x00001000)
+#define ADC_ExternalTrigInjecConv_None                 ((uint32_t)0x00007000)
+
+#define ADC_ExternalTrigInjecConv_T4_CC3               ((uint32_t)0x00002000)
+#define ADC_ExternalTrigInjecConv_T8_CC2               ((uint32_t)0x00003000)
+#define ADC_ExternalTrigInjecConv_T8_CC4               ((uint32_t)0x00004000)
+#define ADC_ExternalTrigInjecConv_T5_TRGO              ((uint32_t)0x00005000)
+#define ADC_ExternalTrigInjecConv_T5_CC4               ((uint32_t)0x00006000)
+
+/* ADC_injected_channel_selection */
+#define ADC_InjectedChannel_1                          ((uint8_t)0x14)
+#define ADC_InjectedChannel_2                          ((uint8_t)0x18)
+#define ADC_InjectedChannel_3                          ((uint8_t)0x1C)
+#define ADC_InjectedChannel_4                          ((uint8_t)0x20)
+
+/* ADC_analog_watchdog_selection */
+#define ADC_AnalogWatchdog_SingleRegEnable             ((uint32_t)0x00800200)
+#define ADC_AnalogWatchdog_SingleInjecEnable           ((uint32_t)0x00400200)
+#define ADC_AnalogWatchdog_SingleRegOrInjecEnable      ((uint32_t)0x00C00200)
+#define ADC_AnalogWatchdog_AllRegEnable                ((uint32_t)0x00800000)
+#define ADC_AnalogWatchdog_AllInjecEnable              ((uint32_t)0x00400000)
+#define ADC_AnalogWatchdog_AllRegAllInjecEnable        ((uint32_t)0x00C00000)
+#define ADC_AnalogWatchdog_None                        ((uint32_t)0x00000000)
+
+/* ADC_interrupts_definition */
+#define ADC_IT_EOC                                     ((uint16_t)0x0220)
+#define ADC_IT_AWD                                     ((uint16_t)0x0140)
+#define ADC_IT_JEOC                                    ((uint16_t)0x0480)
+
+/* ADC_flags_definition */
+#define ADC_FLAG_AWD                                   ((uint8_t)0x01)
+#define ADC_FLAG_EOC                                   ((uint8_t)0x02)
+#define ADC_FLAG_JEOC                                  ((uint8_t)0x04)
+#define ADC_FLAG_JSTRT                                 ((uint8_t)0x08)
+#define ADC_FLAG_STRT                                  ((uint8_t)0x10)
+
+void       ADC_DeInit(ADC_TypeDef *ADCx);
+void       ADC_Init(ADC_TypeDef *ADCx, ADC_InitTypeDef *ADC_InitStruct);
+void       ADC_StructInit(ADC_InitTypeDef *ADC_InitStruct);
+void       ADC_Cmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+void       ADC_DMACmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+void       ADC_ITConfig(ADC_TypeDef *ADCx, uint16_t ADC_IT, FunctionalState NewState);
+void       ADC_ResetCalibration(ADC_TypeDef *ADCx);
+FlagStatus ADC_GetResetCalibrationStatus(ADC_TypeDef *ADCx);
+void       ADC_StartCalibration(ADC_TypeDef *ADCx);
+FlagStatus ADC_GetCalibrationStatus(ADC_TypeDef *ADCx);
+void       ADC_SoftwareStartConvCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+FlagStatus ADC_GetSoftwareStartConvStatus(ADC_TypeDef *ADCx);
+void       ADC_DiscModeChannelCountConfig(ADC_TypeDef *ADCx, uint8_t Number);
+void       ADC_DiscModeCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+void       ADC_RegularChannelConfig(ADC_TypeDef *ADCx, uint8_t ADC_Channel, uint8_t Rank, uint8_t ADC_SampleTime);
+void       ADC_ExternalTrigConvCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+uint16_t   ADC_GetConversionValue(ADC_TypeDef *ADCx);
+uint32_t   ADC_GetDualModeConversionValue(void);
+void       ADC_AutoInjectedConvCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+void       ADC_InjectedDiscModeCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+void       ADC_ExternalTrigInjectedConvConfig(ADC_TypeDef *ADCx, uint32_t ADC_ExternalTrigInjecConv);
+void       ADC_ExternalTrigInjectedConvCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+void       ADC_SoftwareStartInjectedConvCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+FlagStatus ADC_GetSoftwareStartInjectedConvCmdStatus(ADC_TypeDef *ADCx);
+void       ADC_InjectedChannelConfig(ADC_TypeDef *ADCx, uint8_t ADC_Channel, uint8_t Rank, uint8_t ADC_SampleTime);
+void       ADC_InjectedSequencerLengthConfig(ADC_TypeDef *ADCx, uint8_t Length);
+void       ADC_SetInjectedOffset(ADC_TypeDef *ADCx, uint8_t ADC_InjectedChannel, uint16_t Offset);
+uint16_t   ADC_GetInjectedConversionValue(ADC_TypeDef *ADCx, uint8_t ADC_InjectedChannel);
+void       ADC_AnalogWatchdogCmd(ADC_TypeDef *ADCx, uint32_t ADC_AnalogWatchdog);
+void       ADC_AnalogWatchdogThresholdsConfig(ADC_TypeDef *ADCx, uint16_t HighThreshold, uint16_t LowThreshold);
+void       ADC_AnalogWatchdogSingleChannelConfig(ADC_TypeDef *ADCx, uint8_t ADC_Channel);
+void       ADC_TempSensorVrefintCmd(FunctionalState NewState);
+FlagStatus ADC_GetFlagStatus(ADC_TypeDef *ADCx, uint8_t ADC_FLAG);
+void       ADC_ClearFlag(ADC_TypeDef *ADCx, uint8_t ADC_FLAG);
+ITStatus   ADC_GetITStatus(ADC_TypeDef *ADCx, uint16_t ADC_IT);
+void       ADC_ClearITPendingBit(ADC_TypeDef *ADCx, uint16_t ADC_IT);
+s32        TempSensor_Volt_To_Temper(s32 Value);
+void       ADC_BufferCmd(ADC_TypeDef *ADCx, FunctionalState NewState);
+int16_t    Get_CalibrationValue(ADC_TypeDef *ADCx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_bkp.h

@@ -0,0 +1,93 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_bkp.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      BKP firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_BKP_H
+#define __CH32V20x_BKP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* Tamper_Pin_active_level */
+#define BKP_TamperPinLevel_High           ((uint16_t)0x0000)
+#define BKP_TamperPinLevel_Low            ((uint16_t)0x0001)
+
+/* RTC_output_source_to_output_on_the_Tamper_pin */
+#define BKP_RTCOutputSource_None          ((uint16_t)0x0000)
+#define BKP_RTCOutputSource_CalibClock    ((uint16_t)0x0080)
+#define BKP_RTCOutputSource_Alarm         ((uint16_t)0x0100)
+#define BKP_RTCOutputSource_Second        ((uint16_t)0x0300)
+
+/* Data_Backup_Register */
+#define BKP_DR1                           ((uint16_t)0x0004)
+#define BKP_DR2                           ((uint16_t)0x0008)
+#define BKP_DR3                           ((uint16_t)0x000C)
+#define BKP_DR4                           ((uint16_t)0x0010)
+#define BKP_DR5                           ((uint16_t)0x0014)
+#define BKP_DR6                           ((uint16_t)0x0018)
+#define BKP_DR7                           ((uint16_t)0x001C)
+#define BKP_DR8                           ((uint16_t)0x0020)
+#define BKP_DR9                           ((uint16_t)0x0024)
+#define BKP_DR10                          ((uint16_t)0x0028)
+#define BKP_DR11                          ((uint16_t)0x0040)
+#define BKP_DR12                          ((uint16_t)0x0044)
+#define BKP_DR13                          ((uint16_t)0x0048)
+#define BKP_DR14                          ((uint16_t)0x004C)
+#define BKP_DR15                          ((uint16_t)0x0050)
+#define BKP_DR16                          ((uint16_t)0x0054)
+#define BKP_DR17                          ((uint16_t)0x0058)
+#define BKP_DR18                          ((uint16_t)0x005C)
+#define BKP_DR19                          ((uint16_t)0x0060)
+#define BKP_DR20                          ((uint16_t)0x0064)
+#define BKP_DR21                          ((uint16_t)0x0068)
+#define BKP_DR22                          ((uint16_t)0x006C)
+#define BKP_DR23                          ((uint16_t)0x0070)
+#define BKP_DR24                          ((uint16_t)0x0074)
+#define BKP_DR25                          ((uint16_t)0x0078)
+#define BKP_DR26                          ((uint16_t)0x007C)
+#define BKP_DR27                          ((uint16_t)0x0080)
+#define BKP_DR28                          ((uint16_t)0x0084)
+#define BKP_DR29                          ((uint16_t)0x0088)
+#define BKP_DR30                          ((uint16_t)0x008C)
+#define BKP_DR31                          ((uint16_t)0x0090)
+#define BKP_DR32                          ((uint16_t)0x0094)
+#define BKP_DR33                          ((uint16_t)0x0098)
+#define BKP_DR34                          ((uint16_t)0x009C)
+#define BKP_DR35                          ((uint16_t)0x00A0)
+#define BKP_DR36                          ((uint16_t)0x00A4)
+#define BKP_DR37                          ((uint16_t)0x00A8)
+#define BKP_DR38                          ((uint16_t)0x00AC)
+#define BKP_DR39                          ((uint16_t)0x00B0)
+#define BKP_DR40                          ((uint16_t)0x00B4)
+#define BKP_DR41                          ((uint16_t)0x00B8)
+#define BKP_DR42                          ((uint16_t)0x00BC)
+
+void       BKP_DeInit(void);
+void       BKP_TamperPinLevelConfig(uint16_t BKP_TamperPinLevel);
+void       BKP_TamperPinCmd(FunctionalState NewState);
+void       BKP_ITConfig(FunctionalState NewState);
+void       BKP_RTCOutputConfig(uint16_t BKP_RTCOutputSource);
+void       BKP_SetRTCCalibrationValue(uint8_t CalibrationValue);
+void       BKP_WriteBackupRegister(uint16_t BKP_DR, uint16_t Data);
+uint16_t   BKP_ReadBackupRegister(uint16_t BKP_DR);
+FlagStatus BKP_GetFlagStatus(void);
+void       BKP_ClearFlag(void);
+ITStatus   BKP_GetITStatus(void);
+void       BKP_ClearITPendingBit(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_can.h

@@ -0,0 +1,369 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_can.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      CAN firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_CAN_H
+#define __CH32V20x_CAN_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* CAN init structure definition */
+typedef struct
+{
+    uint16_t CAN_Prescaler; /* Specifies the length of a time quantum.
+                               It ranges from 1 to 1024. */
+
+    uint8_t CAN_Mode; /* Specifies the CAN operating mode.
+                         This parameter can be a value of
+                        @ref CAN_operating_mode */
+
+    uint8_t CAN_SJW; /* Specifies the maximum number of time quanta
+                        the CAN hardware is allowed to lengthen or
+                        shorten a bit to perform resynchronization.
+                        This parameter can be a value of
+                        @ref CAN_synchronisation_jump_width */
+
+    uint8_t CAN_BS1; /* Specifies the number of time quanta in Bit
+                        Segment 1. This parameter can be a value of
+                        @ref CAN_time_quantum_in_bit_segment_1 */
+
+    uint8_t CAN_BS2; /* Specifies the number of time quanta in Bit
+                        Segment 2.
+                        This parameter can be a value of
+                        @ref CAN_time_quantum_in_bit_segment_2 */
+
+    FunctionalState CAN_TTCM; /* Enable or disable the time triggered
+                                 communication mode. This parameter can be set
+                                 either to ENABLE or DISABLE. */
+
+    FunctionalState CAN_ABOM; /* Enable or disable the automatic bus-off
+                                 management. This parameter can be set either
+                                 to ENABLE or DISABLE. */
+
+    FunctionalState CAN_AWUM; /* Enable or disable the automatic wake-up mode.
+                                 This parameter can be set either to ENABLE or
+                                 DISABLE. */
+
+    FunctionalState CAN_NART; /* Enable or disable the no-automatic
+                                 retransmission mode. This parameter can be
+                                 set either to ENABLE or DISABLE. */
+
+    FunctionalState CAN_RFLM; /* Enable or disable the Receive FIFO Locked mode.
+                                 This parameter can be set either to ENABLE
+                                 or DISABLE. */
+
+    FunctionalState CAN_TXFP; /* Enable or disable the transmit FIFO priority.
+                                 This parameter can be set either to ENABLE
+                                 or DISABLE. */
+} CAN_InitTypeDef;
+
+/* CAN filter init structure definition */
+typedef struct
+{
+    uint16_t CAN_FilterIdHigh; /* Specifies the filter identification number (MSBs for a 32-bit
+                                      configuration, first one for a 16-bit configuration).
+                                      This parameter can be a value between 0x0000 and 0xFFFF */
+
+    uint16_t CAN_FilterIdLow; /* Specifies the filter identification number (LSBs for a 32-bit
+                                     configuration, second one for a 16-bit configuration).
+                                     This parameter can be a value between 0x0000 and 0xFFFF */
+
+    uint16_t CAN_FilterMaskIdHigh; /* Specifies the filter mask number or identification number,
+                                          according to the mode (MSBs for a 32-bit configuration,
+                                          first one for a 16-bit configuration).
+                                          This parameter can be a value between 0x0000 and 0xFFFF */
+
+    uint16_t CAN_FilterMaskIdLow; /* Specifies the filter mask number or identification number,
+                                         according to the mode (LSBs for a 32-bit configuration,
+                                         second one for a 16-bit configuration).
+                                         This parameter can be a value between 0x0000 and 0xFFFF */
+
+    uint16_t CAN_FilterFIFOAssignment; /* Specifies the FIFO (0 or 1) which will be assigned to the filter.
+                                              This parameter can be a value of @ref CAN_filter_FIFO */
+
+    uint8_t CAN_FilterNumber; /* Specifies the filter which will be initialized. It ranges from 0 to 13. */
+
+    uint8_t CAN_FilterMode; /* Specifies the filter mode to be initialized.
+                                   This parameter can be a value of @ref CAN_filter_mode */
+
+    uint8_t CAN_FilterScale; /* Specifies the filter scale.
+                                    This parameter can be a value of @ref CAN_filter_scale */
+
+    FunctionalState CAN_FilterActivation; /* Enable or disable the filter.
+                                              This parameter can be set either to ENABLE or DISABLE. */
+} CAN_FilterInitTypeDef;
+
+/* CAN Tx message structure definition */
+typedef struct
+{
+    uint32_t StdId; /* Specifies the standard identifier.
+                       This parameter can be a value between 0 to 0x7FF. */
+
+    uint32_t ExtId; /* Specifies the extended identifier.
+                       This parameter can be a value between 0 to 0x1FFFFFFF. */
+
+    uint8_t IDE; /* Specifies the type of identifier for the message that
+                    will be transmitted. This parameter can be a value
+                    of @ref CAN_identifier_type */
+
+    uint8_t RTR; /* Specifies the type of frame for the message that will
+                    be transmitted. This parameter can be a value of
+                    @ref CAN_remote_transmission_request */
+
+    uint8_t DLC; /* Specifies the length of the frame that will be
+                    transmitted. This parameter can be a value between
+                    0 to 8 */
+
+    uint8_t Data[8]; /* Contains the data to be transmitted. It ranges from 0
+                         to 0xFF. */
+} CanTxMsg;
+
+/* CAN Rx message structure definition  */
+typedef struct
+{
+    uint32_t StdId; /* Specifies the standard identifier.
+                       This parameter can be a value between 0 to 0x7FF. */
+
+    uint32_t ExtId; /* Specifies the extended identifier.
+                       This parameter can be a value between 0 to 0x1FFFFFFF. */
+
+    uint8_t IDE; /* Specifies the type of identifier for the message that
+                    will be received. This parameter can be a value of
+                    @ref CAN_identifier_type */
+
+    uint8_t RTR; /* Specifies the type of frame for the received message.
+                    This parameter can be a value of
+                    @ref CAN_remote_transmission_request */
+
+    uint8_t DLC; /* Specifies the length of the frame that will be received.
+                    This parameter can be a value between 0 to 8 */
+
+    uint8_t Data[8]; /* Contains the data to be received. It ranges from 0 to
+                        0xFF. */
+
+    uint8_t FMI; /* Specifies the index of the filter the message stored in
+                    the mailbox passes through. This parameter can be a
+                    value between 0 to 0xFF */
+} CanRxMsg;
+
+/* CAN_sleep_constants */
+#define CAN_InitStatus_Failed               ((uint8_t)0x00) /* CAN initialization failed */
+#define CAN_InitStatus_Success              ((uint8_t)0x01) /* CAN initialization OK */
+
+/* CAN_Mode */
+#define CAN_Mode_Normal                     ((uint8_t)0x00) /* normal mode */
+#define CAN_Mode_LoopBack                   ((uint8_t)0x01) /* loopback mode */
+#define CAN_Mode_Silent                     ((uint8_t)0x02) /* silent mode */
+#define CAN_Mode_Silent_LoopBack            ((uint8_t)0x03) /* loopback combined with silent mode */
+
+/* CAN_Operating_Mode */
+#define CAN_OperatingMode_Initialization    ((uint8_t)0x00) /* Initialization mode */
+#define CAN_OperatingMode_Normal            ((uint8_t)0x01) /* Normal mode */
+#define CAN_OperatingMode_Sleep             ((uint8_t)0x02) /* sleep mode */
+
+/* CAN_Mode_Status */
+#define CAN_ModeStatus_Failed               ((uint8_t)0x00)                   /* CAN entering the specific mode failed */
+#define CAN_ModeStatus_Success              ((uint8_t)!CAN_ModeStatus_Failed) /* CAN entering the specific mode Succeed */
+
+/* CAN_synchronisation_jump_width */
+#define CAN_SJW_1tq                         ((uint8_t)0x00) /* 1 time quantum */
+#define CAN_SJW_2tq                         ((uint8_t)0x01) /* 2 time quantum */
+#define CAN_SJW_3tq                         ((uint8_t)0x02) /* 3 time quantum */
+#define CAN_SJW_4tq                         ((uint8_t)0x03) /* 4 time quantum */
+
+/* CAN_time_quantum_in_bit_segment_1 */
+#define CAN_BS1_1tq                         ((uint8_t)0x00) /* 1 time quantum */
+#define CAN_BS1_2tq                         ((uint8_t)0x01) /* 2 time quantum */
+#define CAN_BS1_3tq                         ((uint8_t)0x02) /* 3 time quantum */
+#define CAN_BS1_4tq                         ((uint8_t)0x03) /* 4 time quantum */
+#define CAN_BS1_5tq                         ((uint8_t)0x04) /* 5 time quantum */
+#define CAN_BS1_6tq                         ((uint8_t)0x05) /* 6 time quantum */
+#define CAN_BS1_7tq                         ((uint8_t)0x06) /* 7 time quantum */
+#define CAN_BS1_8tq                         ((uint8_t)0x07) /* 8 time quantum */
+#define CAN_BS1_9tq                         ((uint8_t)0x08) /* 9 time quantum */
+#define CAN_BS1_10tq                        ((uint8_t)0x09) /* 10 time quantum */
+#define CAN_BS1_11tq                        ((uint8_t)0x0A) /* 11 time quantum */
+#define CAN_BS1_12tq                        ((uint8_t)0x0B) /* 12 time quantum */
+#define CAN_BS1_13tq                        ((uint8_t)0x0C) /* 13 time quantum */
+#define CAN_BS1_14tq                        ((uint8_t)0x0D) /* 14 time quantum */
+#define CAN_BS1_15tq                        ((uint8_t)0x0E) /* 15 time quantum */
+#define CAN_BS1_16tq                        ((uint8_t)0x0F) /* 16 time quantum */
+
+/* CAN_time_quantum_in_bit_segment_2 */
+#define CAN_BS2_1tq                         ((uint8_t)0x00) /* 1 time quantum */
+#define CAN_BS2_2tq                         ((uint8_t)0x01) /* 2 time quantum */
+#define CAN_BS2_3tq                         ((uint8_t)0x02) /* 3 time quantum */
+#define CAN_BS2_4tq                         ((uint8_t)0x03) /* 4 time quantum */
+#define CAN_BS2_5tq                         ((uint8_t)0x04) /* 5 time quantum */
+#define CAN_BS2_6tq                         ((uint8_t)0x05) /* 6 time quantum */
+#define CAN_BS2_7tq                         ((uint8_t)0x06) /* 7 time quantum */
+#define CAN_BS2_8tq                         ((uint8_t)0x07) /* 8 time quantum */
+
+/* CAN_filter_mode */
+#define CAN_FilterMode_IdMask               ((uint8_t)0x00) /* identifier/mask mode */
+#define CAN_FilterMode_IdList               ((uint8_t)0x01) /* identifier list mode */
+
+/* CAN_filter_scale */
+#define CAN_FilterScale_16bit               ((uint8_t)0x00) /* Two 16-bit filters */
+#define CAN_FilterScale_32bit               ((uint8_t)0x01) /* One 32-bit filter */
+
+/* CAN_filter_FIFO */
+#define CAN_Filter_FIFO0                    ((uint8_t)0x00) /* Filter FIFO 0 assignment for filter x */
+#define CAN_Filter_FIFO1                    ((uint8_t)0x01) /* Filter FIFO 1 assignment for filter x */
+
+/* CAN_identifier_type */
+#define CAN_Id_Standard                     ((uint32_t)0x00000000) /* Standard Id */
+#define CAN_Id_Extended                     ((uint32_t)0x00000004) /* Extended Id */
+
+/* CAN_remote_transmission_request */
+#define CAN_RTR_Data                        ((uint32_t)0x00000000) /* Data frame */
+#define CAN_RTR_Remote                      ((uint32_t)0x00000002) /* Remote frame */
+
+/* CAN_transmit_constants */
+#define CAN_TxStatus_Failed                 ((uint8_t)0x00) /* CAN transmission failed */
+#define CAN_TxStatus_Ok                     ((uint8_t)0x01) /* CAN transmission succeeded */
+#define CAN_TxStatus_Pending                ((uint8_t)0x02) /* CAN transmission pending */
+#define CAN_TxStatus_NoMailBox              ((uint8_t)0x04) /* CAN cell did not provide an empty mailbox */
+
+/* CAN_receive_FIFO_number_constants */
+#define CAN_FIFO0                           ((uint8_t)0x00) /* CAN FIFO 0 used to receive */
+#define CAN_FIFO1                           ((uint8_t)0x01) /* CAN FIFO 1 used to receive */
+
+/* CAN_sleep_constants */
+#define CAN_Sleep_Failed                    ((uint8_t)0x00) /* CAN did not enter the sleep mode */
+#define CAN_Sleep_Ok                        ((uint8_t)0x01) /* CAN entered the sleep mode */
+
+/* CAN_wake_up_constants */
+#define CAN_WakeUp_Failed                   ((uint8_t)0x00) /* CAN did not leave the sleep mode */
+#define CAN_WakeUp_Ok                       ((uint8_t)0x01) /* CAN leaved the sleep mode */
+
+/* CAN_Error_Code_constants */
+#define CAN_ErrorCode_NoErr                 ((uint8_t)0x00) /* No Error */
+#define CAN_ErrorCode_StuffErr              ((uint8_t)0x10) /* Stuff Error */
+#define CAN_ErrorCode_FormErr               ((uint8_t)0x20) /* Form Error */
+#define CAN_ErrorCode_ACKErr                ((uint8_t)0x30) /* Acknowledgment Error */
+#define CAN_ErrorCode_BitRecessiveErr       ((uint8_t)0x40) /* Bit Recessive Error */
+#define CAN_ErrorCode_BitDominantErr        ((uint8_t)0x50) /* Bit Dominant Error */
+#define CAN_ErrorCode_CRCErr                ((uint8_t)0x60) /* CRC Error  */
+#define CAN_ErrorCode_SoftwareSetErr        ((uint8_t)0x70) /* Software Set Error */
+
+/* CAN_flags */
+/* Transmit Flags */
+/* If the flag is 0x3XXXXXXX, it means that it can be used with CAN_GetFlagStatus()
+ * and CAN_ClearFlag() functions. 
+ * If the flag is 0x1XXXXXXX, it means that it can only be used with CAN_GetFlagStatus() function. 
+*/
+#define CAN_FLAG_RQCP0                      ((uint32_t)0x38000001) /* Request MailBox0 Flag */
+#define CAN_FLAG_RQCP1                      ((uint32_t)0x38000100) /* Request MailBox1 Flag */
+#define CAN_FLAG_RQCP2                      ((uint32_t)0x38010000) /* Request MailBox2 Flag */
+
+/* Receive Flags */
+#define CAN_FLAG_FMP0                       ((uint32_t)0x12000003) /* FIFO 0 Message Pending Flag */
+#define CAN_FLAG_FF0                        ((uint32_t)0x32000008) /* FIFO 0 Full Flag            */
+#define CAN_FLAG_FOV0                       ((uint32_t)0x32000010) /* FIFO 0 Overrun Flag         */
+#define CAN_FLAG_FMP1                       ((uint32_t)0x14000003) /* FIFO 1 Message Pending Flag */
+#define CAN_FLAG_FF1                        ((uint32_t)0x34000008) /* FIFO 1 Full Flag            */
+#define CAN_FLAG_FOV1                       ((uint32_t)0x34000010) /* FIFO 1 Overrun Flag         */
+
+/* Operating Mode Flags */
+#define CAN_FLAG_WKU                        ((uint32_t)0x31000008) /* Wake up Flag */
+#define CAN_FLAG_SLAK                       ((uint32_t)0x31000012) /* Sleep acknowledge Flag */
+/* Note:
+ *When SLAK intterupt is disabled (SLKIE=0), no polling on SLAKI is possible. 
+ *In this case the SLAK bit can be polled.
+*/
+
+
+/* Error Flags */
+#define CAN_FLAG_EWG                        ((uint32_t)0x10F00001) /* Error Warning Flag   */
+#define CAN_FLAG_EPV                        ((uint32_t)0x10F00002) /* Error Passive Flag   */
+#define CAN_FLAG_BOF                        ((uint32_t)0x10F00004) /* Bus-Off Flag         */
+#define CAN_FLAG_LEC                        ((uint32_t)0x30F00070) /* Last error code Flag */
+
+/* CAN_interrupts */
+#define CAN_IT_TME                          ((uint32_t)0x00000001) /* Transmit mailbox empty Interrupt*/
+
+/* Receive Interrupts */
+#define CAN_IT_FMP0                         ((uint32_t)0x00000002) /* FIFO 0 message pending Interrupt*/
+#define CAN_IT_FF0                          ((uint32_t)0x00000004) /* FIFO 0 full Interrupt*/
+#define CAN_IT_FOV0                         ((uint32_t)0x00000008) /* FIFO 0 overrun Interrupt*/
+#define CAN_IT_FMP1                         ((uint32_t)0x00000010) /* FIFO 1 message pending Interrupt*/
+#define CAN_IT_FF1                          ((uint32_t)0x00000020) /* FIFO 1 full Interrupt*/
+#define CAN_IT_FOV1                         ((uint32_t)0x00000040) /* FIFO 1 overrun Interrupt*/
+
+/* Operating Mode Interrupts */
+#define CAN_IT_WKU                          ((uint32_t)0x00010000) /* Wake-up Interrupt*/
+#define CAN_IT_SLK                          ((uint32_t)0x00020000) /* Sleep acknowledge Interrupt*/
+
+/* Error Interrupts */
+#define CAN_IT_EWG                          ((uint32_t)0x00000100) /* Error warning Interrupt*/
+#define CAN_IT_EPV                          ((uint32_t)0x00000200) /* Error passive Interrupt*/
+#define CAN_IT_BOF                          ((uint32_t)0x00000400) /* Bus-off Interrupt*/
+#define CAN_IT_LEC                          ((uint32_t)0x00000800) /* Last error code Interrupt*/
+#define CAN_IT_ERR                          ((uint32_t)0x00008000) /* Error Interrupt*/
+
+/* Flags named as Interrupts : kept only for FW compatibility */
+#define CAN_IT_RQCP0                        CAN_IT_TME
+#define CAN_IT_RQCP1                        CAN_IT_TME
+#define CAN_IT_RQCP2                        CAN_IT_TME
+
+/* CAN_Legacy */
+#define CANINITFAILED                       CAN_InitStatus_Failed
+#define CANINITOK                           CAN_InitStatus_Success
+#define CAN_FilterFIFO0                     CAN_Filter_FIFO0
+#define CAN_FilterFIFO1                     CAN_Filter_FIFO1
+#define CAN_ID_STD                          CAN_Id_Standard
+#define CAN_ID_EXT                          CAN_Id_Extended
+#define CAN_RTR_DATA                        CAN_RTR_Data
+#define CAN_RTR_REMOTE                      CAN_RTR_Remote
+#define CANTXFAILE                          CAN_TxStatus_Failed
+#define CANTXOK                             CAN_TxStatus_Ok
+#define CANTXPENDING                        CAN_TxStatus_Pending
+#define CAN_NO_MB                           CAN_TxStatus_NoMailBox
+#define CANSLEEPFAILED                      CAN_Sleep_Failed
+#define CANSLEEPOK                          CAN_Sleep_Ok
+#define CANWAKEUPFAILED                     CAN_WakeUp_Failed
+#define CANWAKEUPOK                         CAN_WakeUp_Ok
+
+void       CAN_DeInit(CAN_TypeDef *CANx);
+uint8_t    CAN_Init(CAN_TypeDef *CANx, CAN_InitTypeDef *CAN_InitStruct);
+void       CAN_FilterInit(CAN_FilterInitTypeDef *CAN_FilterInitStruct);
+void       CAN_StructInit(CAN_InitTypeDef *CAN_InitStruct);
+void       CAN_SlaveStartBank(uint8_t CAN_BankNumber);
+void       CAN_DBGFreeze(CAN_TypeDef *CANx, FunctionalState NewState);
+void       CAN_TTComModeCmd(CAN_TypeDef *CANx, FunctionalState NewState);
+uint8_t    CAN_Transmit(CAN_TypeDef *CANx, CanTxMsg *TxMessage);
+uint8_t    CAN_TransmitStatus(CAN_TypeDef *CANx, uint8_t TransmitMailbox);
+void       CAN_CancelTransmit(CAN_TypeDef *CANx, uint8_t Mailbox);
+void       CAN_Receive(CAN_TypeDef *CANx, uint8_t FIFONumber, CanRxMsg *RxMessage);
+void       CAN_FIFORelease(CAN_TypeDef *CANx, uint8_t FIFONumber);
+uint8_t    CAN_MessagePending(CAN_TypeDef *CANx, uint8_t FIFONumber);
+uint8_t    CAN_OperatingModeRequest(CAN_TypeDef *CANx, uint8_t CAN_OperatingMode);
+uint8_t    CAN_Sleep(CAN_TypeDef *CANx);
+uint8_t    CAN_WakeUp(CAN_TypeDef *CANx);
+uint8_t    CAN_GetLastErrorCode(CAN_TypeDef *CANx);
+uint8_t    CAN_GetReceiveErrorCounter(CAN_TypeDef *CANx);
+uint8_t    CAN_GetLSBTransmitErrorCounter(CAN_TypeDef *CANx);
+void       CAN_ITConfig(CAN_TypeDef *CANx, uint32_t CAN_IT, FunctionalState NewState);
+FlagStatus CAN_GetFlagStatus(CAN_TypeDef *CANx, uint32_t CAN_FLAG);
+void       CAN_ClearFlag(CAN_TypeDef *CANx, uint32_t CAN_FLAG);
+ITStatus   CAN_GetITStatus(CAN_TypeDef *CANx, uint32_t CAN_IT);
+void       CAN_ClearITPendingBit(CAN_TypeDef *CANx, uint32_t CAN_IT);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_crc.h

@@ -0,0 +1,33 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_crc.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      CRC firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_CRC_H
+#define __CH32V20x_CRC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+void     CRC_ResetDR(void);
+uint32_t CRC_CalcCRC(uint32_t Data);
+uint32_t CRC_CalcBlockCRC(uint32_t pBuffer[], uint32_t BufferLength);
+uint32_t CRC_GetCRC(void);
+void     CRC_SetIDRegister(uint8_t IDValue);
+uint8_t  CRC_GetIDRegister(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_dbgmcu.h

@@ -0,0 +1,52 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_dbgmcu.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      DBGMCU firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_DBGMCU_H
+#define __CH32V20x_DBGMCU_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+#define DBGMCU_SLEEP                 ((uint32_t)0x00000001)
+#define DBGMCU_STOP                  ((uint32_t)0x00000002)
+#define DBGMCU_STANDBY               ((uint32_t)0x00000004)
+#define DBGMCU_IWDG_STOP             ((uint32_t)0x00000100)
+#define DBGMCU_WWDG_STOP             ((uint32_t)0x00000200)
+#define DBGMCU_I2C1_SMBUS_TIMEOUT    ((uint32_t)0x00000400)
+#define DBGMCU_I2C2_SMBUS_TIMEOUT    ((uint32_t)0x00000800)
+#define DBGMCU_TIM1_STOP             ((uint32_t)0x00001000)
+#define DBGMCU_TIM2_STOP             ((uint32_t)0x00002000)
+#define DBGMCU_TIM3_STOP             ((uint32_t)0x00004000)
+#define DBGMCU_TIM4_STOP             ((uint32_t)0x00008000)
+#define DBGMCU_TIM5_STOP             ((uint32_t)0x00010000)
+#define DBGMCU_TIM6_STOP             ((uint32_t)0x00020000)
+#define DBGMCU_TIM7_STOP             ((uint32_t)0x00040000)
+#define DBGMCU_TIM8_STOP             ((uint32_t)0x00080000)
+#define DBGMCU_CAN1_STOP             ((uint32_t)0x00100000)
+#define DBGMCU_CAN2_STOP             ((uint32_t)0x00200000)
+#define DBGMCU_TIM9_STOP             ((uint32_t)0x00400000)
+#define DBGMCU_TIM10_STOP            ((uint32_t)0x00800000)
+
+uint32_t DBGMCU_GetREVID(void);
+uint32_t DBGMCU_GetDEVID(void);
+uint32_t __get_DEBUG_CR(void);
+void __set_DEBUG_CR(uint32_t value);
+void DBGMCU_Config(uint32_t DBGMCU_Periph, FunctionalState NewState);
+uint32_t DBGMCU_GetCHIPID( void );
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_dma.h

@@ -0,0 +1,184 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_dma.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      DMA firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_DMA_H
+#define __CH32V20x_DMA_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* DMA Init structure definition */
+typedef struct
+{
+    uint32_t DMA_PeripheralBaseAddr; /* Specifies the peripheral base address for DMAy Channelx. */
+
+    uint32_t DMA_MemoryBaseAddr; /* Specifies the memory base address for DMAy Channelx. */
+
+    uint32_t DMA_DIR; /* Specifies if the peripheral is the source or destination.
+                         This parameter can be a value of @ref DMA_data_transfer_direction */
+
+    uint32_t DMA_BufferSize; /* Specifies the buffer size, in data unit, of the specified Channel.
+                                The data unit is equal to the configuration set in DMA_PeripheralDataSize
+                                or DMA_MemoryDataSize members depending in the transfer direction. */
+
+    uint32_t DMA_PeripheralInc; /* Specifies whether the Peripheral address register is incremented or not.
+                                   This parameter can be a value of @ref DMA_peripheral_incremented_mode */
+
+    uint32_t DMA_MemoryInc; /* Specifies whether the memory address register is incremented or not.
+                               This parameter can be a value of @ref DMA_memory_incremented_mode */
+
+    uint32_t DMA_PeripheralDataSize; /* Specifies the Peripheral data width.
+                                        This parameter can be a value of @ref DMA_peripheral_data_size */
+
+    uint32_t DMA_MemoryDataSize; /* Specifies the Memory data width.
+                                    This parameter can be a value of @ref DMA_memory_data_size */
+
+    uint32_t DMA_Mode; /* Specifies the operation mode of the DMAy Channelx.
+                          This parameter can be a value of @ref DMA_circular_normal_mode.
+                          @note: The circular buffer mode cannot be used if the memory-to-memory
+                                data transfer is configured on the selected Channel */
+
+    uint32_t DMA_Priority; /* Specifies the software priority for the DMAy Channelx.
+                              This parameter can be a value of @ref DMA_priority_level */
+
+    uint32_t DMA_M2M; /* Specifies if the DMAy Channelx will be used in memory-to-memory transfer.
+                         This parameter can be a value of @ref DMA_memory_to_memory */
+} DMA_InitTypeDef;
+
+/* DMA_data_transfer_direction */
+#define DMA_DIR_PeripheralDST              ((uint32_t)0x00000010)
+#define DMA_DIR_PeripheralSRC              ((uint32_t)0x00000000)
+
+/* DMA_peripheral_incremented_mode */
+#define DMA_PeripheralInc_Enable           ((uint32_t)0x00000040)
+#define DMA_PeripheralInc_Disable          ((uint32_t)0x00000000)
+
+/* DMA_memory_incremented_mode */
+#define DMA_MemoryInc_Enable               ((uint32_t)0x00000080)
+#define DMA_MemoryInc_Disable              ((uint32_t)0x00000000)
+
+/* DMA_peripheral_data_size */
+#define DMA_PeripheralDataSize_Byte        ((uint32_t)0x00000000)
+#define DMA_PeripheralDataSize_HalfWord    ((uint32_t)0x00000100)
+#define DMA_PeripheralDataSize_Word        ((uint32_t)0x00000200)
+
+/* DMA_memory_data_size */
+#define DMA_MemoryDataSize_Byte            ((uint32_t)0x00000000)
+#define DMA_MemoryDataSize_HalfWord        ((uint32_t)0x00000400)
+#define DMA_MemoryDataSize_Word            ((uint32_t)0x00000800)
+
+/* DMA_circular_normal_mode */
+#define DMA_Mode_Circular                  ((uint32_t)0x00000020)
+#define DMA_Mode_Normal                    ((uint32_t)0x00000000)
+
+/* DMA_priority_level */
+#define DMA_Priority_VeryHigh              ((uint32_t)0x00003000)
+#define DMA_Priority_High                  ((uint32_t)0x00002000)
+#define DMA_Priority_Medium                ((uint32_t)0x00001000)
+#define DMA_Priority_Low                   ((uint32_t)0x00000000)
+
+/* DMA_memory_to_memory */
+#define DMA_M2M_Enable                     ((uint32_t)0x00004000)
+#define DMA_M2M_Disable                    ((uint32_t)0x00000000)
+
+/* DMA_interrupts_definition */
+#define DMA_IT_TC                          ((uint32_t)0x00000002)
+#define DMA_IT_HT                          ((uint32_t)0x00000004)
+#define DMA_IT_TE                          ((uint32_t)0x00000008)
+
+#define DMA1_IT_GL1                        ((uint32_t)0x00000001)
+#define DMA1_IT_TC1                        ((uint32_t)0x00000002)
+#define DMA1_IT_HT1                        ((uint32_t)0x00000004)
+#define DMA1_IT_TE1                        ((uint32_t)0x00000008)
+#define DMA1_IT_GL2                        ((uint32_t)0x00000010)
+#define DMA1_IT_TC2                        ((uint32_t)0x00000020)
+#define DMA1_IT_HT2                        ((uint32_t)0x00000040)
+#define DMA1_IT_TE2                        ((uint32_t)0x00000080)
+#define DMA1_IT_GL3                        ((uint32_t)0x00000100)
+#define DMA1_IT_TC3                        ((uint32_t)0x00000200)
+#define DMA1_IT_HT3                        ((uint32_t)0x00000400)
+#define DMA1_IT_TE3                        ((uint32_t)0x00000800)
+#define DMA1_IT_GL4                        ((uint32_t)0x00001000)
+#define DMA1_IT_TC4                        ((uint32_t)0x00002000)
+#define DMA1_IT_HT4                        ((uint32_t)0x00004000)
+#define DMA1_IT_TE4                        ((uint32_t)0x00008000)
+#define DMA1_IT_GL5                        ((uint32_t)0x00010000)
+#define DMA1_IT_TC5                        ((uint32_t)0x00020000)
+#define DMA1_IT_HT5                        ((uint32_t)0x00040000)
+#define DMA1_IT_TE5                        ((uint32_t)0x00080000)
+#define DMA1_IT_GL6                        ((uint32_t)0x00100000)
+#define DMA1_IT_TC6                        ((uint32_t)0x00200000)
+#define DMA1_IT_HT6                        ((uint32_t)0x00400000)
+#define DMA1_IT_TE6                        ((uint32_t)0x00800000)
+#define DMA1_IT_GL7                        ((uint32_t)0x01000000)
+#define DMA1_IT_TC7                        ((uint32_t)0x02000000)
+#define DMA1_IT_HT7                        ((uint32_t)0x04000000)
+#define DMA1_IT_TE7                        ((uint32_t)0x08000000)
+#define DMA1_IT_GL8                        ((uint32_t)0x10000000)
+#define DMA1_IT_TC8                        ((uint32_t)0x20000000)
+#define DMA1_IT_HT8                        ((uint32_t)0x40000000)
+#define DMA1_IT_TE8                        ((uint32_t)0x80000000)
+
+/* DMA_flags_definition */
+#define DMA1_FLAG_GL1                      ((uint32_t)0x00000001)
+#define DMA1_FLAG_TC1                      ((uint32_t)0x00000002)
+#define DMA1_FLAG_HT1                      ((uint32_t)0x00000004)
+#define DMA1_FLAG_TE1                      ((uint32_t)0x00000008)
+#define DMA1_FLAG_GL2                      ((uint32_t)0x00000010)
+#define DMA1_FLAG_TC2                      ((uint32_t)0x00000020)
+#define DMA1_FLAG_HT2                      ((uint32_t)0x00000040)
+#define DMA1_FLAG_TE2                      ((uint32_t)0x00000080)
+#define DMA1_FLAG_GL3                      ((uint32_t)0x00000100)
+#define DMA1_FLAG_TC3                      ((uint32_t)0x00000200)
+#define DMA1_FLAG_HT3                      ((uint32_t)0x00000400)
+#define DMA1_FLAG_TE3                      ((uint32_t)0x00000800)
+#define DMA1_FLAG_GL4                      ((uint32_t)0x00001000)
+#define DMA1_FLAG_TC4                      ((uint32_t)0x00002000)
+#define DMA1_FLAG_HT4                      ((uint32_t)0x00004000)
+#define DMA1_FLAG_TE4                      ((uint32_t)0x00008000)
+#define DMA1_FLAG_GL5                      ((uint32_t)0x00010000)
+#define DMA1_FLAG_TC5                      ((uint32_t)0x00020000)
+#define DMA1_FLAG_HT5                      ((uint32_t)0x00040000)
+#define DMA1_FLAG_TE5                      ((uint32_t)0x00080000)
+#define DMA1_FLAG_GL6                      ((uint32_t)0x00100000)
+#define DMA1_FLAG_TC6                      ((uint32_t)0x00200000)
+#define DMA1_FLAG_HT6                      ((uint32_t)0x00400000)
+#define DMA1_FLAG_TE6                      ((uint32_t)0x00800000)
+#define DMA1_FLAG_GL7                      ((uint32_t)0x01000000)
+#define DMA1_FLAG_TC7                      ((uint32_t)0x02000000)
+#define DMA1_FLAG_HT7                      ((uint32_t)0x04000000)
+#define DMA1_FLAG_TE7                      ((uint32_t)0x08000000)
+#define DMA1_FLAG_GL8                      ((uint32_t)0x10000000)
+#define DMA1_FLAG_TC8                      ((uint32_t)0x20000000)
+#define DMA1_FLAG_HT8                      ((uint32_t)0x40000000)
+#define DMA1_FLAG_TE8                      ((uint32_t)0x80000000)
+
+void       DMA_DeInit(DMA_Channel_TypeDef *DMAy_Channelx);
+void       DMA_Init(DMA_Channel_TypeDef *DMAy_Channelx, DMA_InitTypeDef *DMA_InitStruct);
+void       DMA_StructInit(DMA_InitTypeDef *DMA_InitStruct);
+void       DMA_Cmd(DMA_Channel_TypeDef *DMAy_Channelx, FunctionalState NewState);
+void       DMA_ITConfig(DMA_Channel_TypeDef *DMAy_Channelx, uint32_t DMA_IT, FunctionalState NewState);
+void       DMA_SetCurrDataCounter(DMA_Channel_TypeDef *DMAy_Channelx, uint16_t DataNumber);
+uint16_t   DMA_GetCurrDataCounter(DMA_Channel_TypeDef *DMAy_Channelx);
+FlagStatus DMA_GetFlagStatus(uint32_t DMAy_FLAG);
+void       DMA_ClearFlag(uint32_t DMAy_FLAG);
+ITStatus   DMA_GetITStatus(uint32_t DMAy_IT);
+void       DMA_ClearITPendingBit(uint32_t DMAy_IT);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_exti.h

@@ -0,0 +1,95 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_exti.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      EXTI firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_EXTI_H
+#define __CH32V20x_EXTI_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* EXTI mode enumeration */
+typedef enum
+{
+    EXTI_Mode_Interrupt = 0x00,
+    EXTI_Mode_Event = 0x04
+} EXTIMode_TypeDef;
+
+/* EXTI Trigger enumeration */
+typedef enum
+{
+    EXTI_Trigger_Rising = 0x08,
+    EXTI_Trigger_Falling = 0x0C,
+    EXTI_Trigger_Rising_Falling = 0x10
+} EXTITrigger_TypeDef;
+
+/* EXTI Init Structure definition */
+typedef struct
+{
+    uint32_t EXTI_Line; /* Specifies the EXTI lines to be enabled or disabled.
+                           This parameter can be any combination of @ref EXTI_Lines */
+
+    EXTIMode_TypeDef EXTI_Mode; /* Specifies the mode for the EXTI lines.
+                                   This parameter can be a value of @ref EXTIMode_TypeDef */
+
+    EXTITrigger_TypeDef EXTI_Trigger; /* Specifies the trigger signal active edge for the EXTI lines.
+                                         This parameter can be a value of @ref EXTIMode_TypeDef */
+
+    FunctionalState EXTI_LineCmd; /* Specifies the new state of the selected EXTI lines.
+                                     This parameter can be set either to ENABLE or DISABLE */
+} EXTI_InitTypeDef;
+
+/* EXTI_Lines */
+#define EXTI_Line0     ((uint32_t)0x00001)  /* External interrupt line 0 */
+#define EXTI_Line1     ((uint32_t)0x00002)  /* External interrupt line 1 */
+#define EXTI_Line2     ((uint32_t)0x00004)  /* External interrupt line 2 */
+#define EXTI_Line3     ((uint32_t)0x00008)  /* External interrupt line 3 */
+#define EXTI_Line4     ((uint32_t)0x00010)  /* External interrupt line 4 */
+#define EXTI_Line5     ((uint32_t)0x00020)  /* External interrupt line 5 */
+#define EXTI_Line6     ((uint32_t)0x00040)  /* External interrupt line 6 */
+#define EXTI_Line7     ((uint32_t)0x00080)  /* External interrupt line 7 */
+#define EXTI_Line8     ((uint32_t)0x00100)  /* External interrupt line 8 */
+#define EXTI_Line9     ((uint32_t)0x00200)  /* External interrupt line 9 */
+#define EXTI_Line10    ((uint32_t)0x00400)  /* External interrupt line 10 */
+#define EXTI_Line11    ((uint32_t)0x00800)  /* External interrupt line 11 */
+#define EXTI_Line12    ((uint32_t)0x01000)  /* External interrupt line 12 */
+#define EXTI_Line13    ((uint32_t)0x02000)  /* External interrupt line 13 */
+#define EXTI_Line14    ((uint32_t)0x04000)  /* External interrupt line 14 */
+#define EXTI_Line15    ((uint32_t)0x08000)  /* External interrupt line 15 */
+#define EXTI_Line16    ((uint32_t)0x10000)  /* External interrupt line 16 Connected to the PVD Output */
+#define EXTI_Line17    ((uint32_t)0x20000)  /* External interrupt line 17 Connected to the RTC Alarm event */
+#define EXTI_Line18    ((uint32_t)0x40000)  /* External interrupt line 18 Connected to the USBD Device \
+                                               Wakeup from suspend event */
+#define EXTI_Line19    ((uint32_t)0x80000)  /* External interrupt line 19 Connected to the Ethernet Wakeup event */
+#define EXTI_Line20    ((uint32_t)0x100000) /* External interrupt line 20 Connected to the USBFS Wakeup event */
+
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+  #define EXTI_Line21    ((uint32_t)0x200000) /* External interrupt line 21 Connected to the OSCCAL Wakeup event */
+
+#endif
+
+void       EXTI_DeInit(void);
+void       EXTI_Init(EXTI_InitTypeDef *EXTI_InitStruct);
+void       EXTI_StructInit(EXTI_InitTypeDef *EXTI_InitStruct);
+void       EXTI_GenerateSWInterrupt(uint32_t EXTI_Line);
+FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line);
+void       EXTI_ClearFlag(uint32_t EXTI_Line);
+ITStatus   EXTI_GetITStatus(uint32_t EXTI_Line);
+void       EXTI_ClearITPendingBit(uint32_t EXTI_Line);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_flash.h

@@ -0,0 +1,148 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_flash.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the FLASH
+ *                      firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_FLASH_H
+#define __CH32V20x_FLASH_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* FLASH Status */
+typedef enum
+{
+    FLASH_BUSY = 1,
+    FLASH_ERROR_PG,
+    FLASH_ERROR_WRP,
+    FLASH_COMPLETE,
+    FLASH_TIMEOUT,
+    FLASH_OP_RANGE_ERROR = 0xFD,
+    FLASH_ALIGN_ERROR = 0xFE,
+    FLASH_ADR_RANGE_ERROR = 0xFF,
+} FLASH_Status;
+
+/* Write Protect */
+#define FLASH_WRProt_Sectors0          ((uint32_t)0x00000001) /* Write protection of setor 0 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors1          ((uint32_t)0x00000002) /* Write protection of setor 1 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors2          ((uint32_t)0x00000004) /* Write protection of setor 2 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors3          ((uint32_t)0x00000008) /* Write protection of setor 3 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors4          ((uint32_t)0x00000010) /* Write protection of setor 4 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors5          ((uint32_t)0x00000020) /* Write protection of setor 5 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors6          ((uint32_t)0x00000040) /* Write protection of setor 6 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors7          ((uint32_t)0x00000080) /* Write protection of setor 7 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors8          ((uint32_t)0x00000100) /* Write protection of setor 8 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors9          ((uint32_t)0x00000200) /* Write protection of setor 9 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors10         ((uint32_t)0x00000400) /* Write protection of setor 10 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors11         ((uint32_t)0x00000800) /* Write protection of setor 11 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors12         ((uint32_t)0x00001000) /* Write protection of setor 12 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors13         ((uint32_t)0x00002000) /* Write protection of setor 13 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors14         ((uint32_t)0x00004000) /* Write protection of setor 14 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors15         ((uint32_t)0x00008000) /* Write protection of setor 15 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors16         ((uint32_t)0x00010000) /* Write protection of setor 16 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors17         ((uint32_t)0x00020000) /* Write protection of setor 17 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors18         ((uint32_t)0x00040000) /* Write protection of setor 18 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors19         ((uint32_t)0x00080000) /* Write protection of setor 19 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors20         ((uint32_t)0x00100000) /* Write protection of setor 20 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors21         ((uint32_t)0x00200000) /* Write protection of setor 21 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors22         ((uint32_t)0x00400000) /* Write protection of setor 22 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors23         ((uint32_t)0x00800000) /* Write protection of setor 23 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors24         ((uint32_t)0x01000000) /* Write protection of setor 24 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors25         ((uint32_t)0x02000000) /* Write protection of setor 25 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors26         ((uint32_t)0x04000000) /* Write protection of setor 26 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors27         ((uint32_t)0x08000000) /* Write protection of setor 27 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors28         ((uint32_t)0x10000000) /* Write protection of setor 28 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors29         ((uint32_t)0x20000000) /* Write protection of setor 29 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors30         ((uint32_t)0x40000000) /* Write protection of setor 30 ,4K bytes/sector */
+#define FLASH_WRProt_Sectors31to127    ((uint32_t)0x80000000) /* Write protection of page 31 to 127 */
+
+#define FLASH_WRProt_AllSectors        ((uint32_t)0xFFFFFFFF) /* Write protection of all Sectors */
+
+/* Option_Bytes_IWatchdog */
+#define OB_IWDG_SW                     ((uint16_t)0x0001) /* Software IWDG selected */
+#define OB_IWDG_HW                     ((uint16_t)0x0000) /* Hardware IWDG selected */
+
+/* Option_Bytes_nRST_STOP */
+#define OB_STOP_NoRST                  ((uint16_t)0x0002) /* No reset generated when entering in STOP */
+#define OB_STOP_RST                    ((uint16_t)0x0000) /* Reset generated when entering in STOP */
+
+/* Option_Bytes_nRST_STDBY  */
+#define OB_STDBY_NoRST                 ((uint16_t)0x0004) /* No reset generated when entering in STANDBY */
+#define OB_STDBY_RST                   ((uint16_t)0x0000) /* Reset generated when entering in STANDBY */
+
+/* FLASH_Interrupts */
+#define FLASH_IT_ERROR                 ((uint32_t)0x00000400) /* FPEC error interrupt source */
+#define FLASH_IT_EOP                   ((uint32_t)0x00001000) /* End of FLASH Operation Interrupt source */
+#define FLASH_IT_BANK1_ERROR           FLASH_IT_ERROR         /* FPEC BANK1 error interrupt source */
+#define FLASH_IT_BANK1_EOP             FLASH_IT_EOP           /* End of FLASH BANK1 Operation Interrupt source */
+
+/* FLASH_Flags */
+#define FLASH_FLAG_BSY                 ((uint32_t)0x00000001) /* FLASH Busy flag */
+#define FLASH_FLAG_EOP                 ((uint32_t)0x00000020) /* FLASH End of Operation flag */
+#define FLASH_FLAG_WRPRTERR            ((uint32_t)0x00000010) /* FLASH Write protected error flag */
+#define FLASH_FLAG_OPTERR              ((uint32_t)0x00000001) /* FLASH Option Byte error flag */
+
+#define FLASH_FLAG_BANK1_BSY           FLASH_FLAG_BSY       /* FLASH BANK1 Busy flag*/
+#define FLASH_FLAG_BANK1_EOP           FLASH_FLAG_EOP       /* FLASH BANK1 End of Operation flag */
+#define FLASH_FLAG_BANK1_WRPRTERR      FLASH_FLAG_WRPRTERR  /* FLASH BANK1 Write protected error flag */
+
+/* FLASH_Access_CLK */
+#define FLASH_Access_SYSTEM_HALF      ((uint32_t)0x00000000) /* FLASH Enhance Clock = SYSTEM */
+#define FLASH_Access_SYSTEM           ((uint32_t)0x02000000) /* Enhance_CLK = SYSTEM/2 */
+
+/*Functions used for all devices*/
+void         FLASH_Unlock(void);
+void         FLASH_Lock(void);
+FLASH_Status FLASH_ErasePage(uint32_t Page_Address);
+FLASH_Status FLASH_EraseAllPages(void);
+FLASH_Status FLASH_EraseOptionBytes(void);
+FLASH_Status FLASH_ProgramWord(uint32_t Address, uint32_t Data);
+FLASH_Status FLASH_ProgramHalfWord(uint32_t Address, uint16_t Data);
+FLASH_Status FLASH_ProgramOptionByteData(uint32_t Address, uint8_t Data);
+FLASH_Status FLASH_EnableWriteProtection(uint32_t FLASH_Sectors);
+FLASH_Status FLASH_ReadOutProtection(FunctionalState NewState);
+FLASH_Status FLASH_UserOptionByteConfig(uint16_t OB_IWDG, uint16_t OB_STOP, uint16_t OB_STDBY);
+uint32_t     FLASH_GetUserOptionByte(void);
+uint32_t     FLASH_GetWriteProtectionOptionByte(void);
+FlagStatus   FLASH_GetReadOutProtectionStatus(void);
+void         FLASH_ITConfig(uint32_t FLASH_IT, FunctionalState NewState);
+FlagStatus   FLASH_GetFlagStatus(uint32_t FLASH_FLAG);
+void         FLASH_ClearFlag(uint32_t FLASH_FLAG);
+FLASH_Status FLASH_GetStatus(void);
+FLASH_Status FLASH_WaitForLastOperation(uint32_t Timeout);
+void         FLASH_Unlock_Fast(void);
+void         FLASH_Lock_Fast(void);
+void         FLASH_ErasePage_Fast(uint32_t Page_Address);
+void         FLASH_EraseBlock_32K_Fast(uint32_t Block_Address);
+void         FLASH_ProgramPage_Fast(uint32_t Page_Address, uint32_t *pbuf);
+void         FLASH_Access_Clock_Cfg(uint32_t FLASH_Access_CLK);
+void         FLASH_Enhance_Mode(FunctionalState NewState);
+
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+void         FLASH_GetMACAddress(uint8_t *Buffer);
+#endif
+
+/* New function used for all devices */
+void         FLASH_UnlockBank1(void);
+void         FLASH_LockBank1(void);
+FLASH_Status FLASH_EraseAllBank1Pages(void);
+FLASH_Status FLASH_GetBank1Status(void);
+FLASH_Status FLASH_WaitForLastBank1Operation(uint32_t Timeout);
+FLASH_Status FLASH_ROM_ERASE(uint32_t StartAddr, uint32_t Length);
+FLASH_Status FLASH_ROM_WRITE(uint32_t StartAddr, uint32_t *pbuf, uint32_t Length);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_gpio.h

@@ -0,0 +1,191 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_gpio.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/07/23
+ * Description        : This file contains all the functions prototypes for the
+ *                      GPIO firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_GPIO_H
+#define __CH32V20x_GPIO_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* Output Maximum frequency selection */
+typedef enum
+{
+    GPIO_Speed_10MHz = 1,
+    GPIO_Speed_2MHz,
+    GPIO_Speed_50MHz
+} GPIOSpeed_TypeDef;
+
+/* Configuration Mode enumeration */
+typedef enum
+{
+    GPIO_Mode_AIN = 0x0,
+    GPIO_Mode_IN_FLOATING = 0x04,
+    GPIO_Mode_IPD = 0x28,
+    GPIO_Mode_IPU = 0x48,
+    GPIO_Mode_Out_OD = 0x14,
+    GPIO_Mode_Out_PP = 0x10,
+    GPIO_Mode_AF_OD = 0x1C,
+    GPIO_Mode_AF_PP = 0x18
+} GPIOMode_TypeDef;
+
+/* GPIO Init structure definition */
+typedef struct
+{
+    uint16_t GPIO_Pin; /* Specifies the GPIO pins to be configured.
+                          This parameter can be any value of @ref GPIO_pins_define */
+
+    GPIOSpeed_TypeDef GPIO_Speed; /* Specifies the speed for the selected pins.
+                                     This parameter can be a value of @ref GPIOSpeed_TypeDef */
+
+    GPIOMode_TypeDef GPIO_Mode; /* Specifies the operating mode for the selected pins.
+                                   This parameter can be a value of @ref GPIOMode_TypeDef */
+} GPIO_InitTypeDef;
+
+/* Bit_SET and Bit_RESET enumeration */
+typedef enum
+{
+    Bit_RESET = 0,
+    Bit_SET
+} BitAction;
+
+/* GPIO_pins_define */
+#define GPIO_Pin_0                      ((uint16_t)0x0001) /* Pin 0 selected */
+#define GPIO_Pin_1                      ((uint16_t)0x0002) /* Pin 1 selected */
+#define GPIO_Pin_2                      ((uint16_t)0x0004) /* Pin 2 selected */
+#define GPIO_Pin_3                      ((uint16_t)0x0008) /* Pin 3 selected */
+#define GPIO_Pin_4                      ((uint16_t)0x0010) /* Pin 4 selected */
+#define GPIO_Pin_5                      ((uint16_t)0x0020) /* Pin 5 selected */
+#define GPIO_Pin_6                      ((uint16_t)0x0040) /* Pin 6 selected */
+#define GPIO_Pin_7                      ((uint16_t)0x0080) /* Pin 7 selected */
+#define GPIO_Pin_8                      ((uint16_t)0x0100) /* Pin 8 selected */
+#define GPIO_Pin_9                      ((uint16_t)0x0200) /* Pin 9 selected */
+#define GPIO_Pin_10                     ((uint16_t)0x0400) /* Pin 10 selected */
+#define GPIO_Pin_11                     ((uint16_t)0x0800) /* Pin 11 selected */
+#define GPIO_Pin_12                     ((uint16_t)0x1000) /* Pin 12 selected */
+#define GPIO_Pin_13                     ((uint16_t)0x2000) /* Pin 13 selected */
+#define GPIO_Pin_14                     ((uint16_t)0x4000) /* Pin 14 selected */
+#define GPIO_Pin_15                     ((uint16_t)0x8000) /* Pin 15 selected */
+#define GPIO_Pin_All                    ((uint16_t)0xFFFF) /* All pins selected */
+
+/* GPIO_Remap_define */
+/* PCFR1 */
+#define GPIO_Remap_SPI1                 ((uint32_t)0x00000001) /* SPI1 Alternate Function mapping */
+#define GPIO_Remap_I2C1                 ((uint32_t)0x00000002) /* I2C1 Alternate Function mapping */
+#define GPIO_Remap_USART1               ((uint32_t)0x00000004) /* USART1 Alternate Function mapping low bit */
+#define GPIO_Remap_USART2               ((uint32_t)0x00000008) /* USART2 Alternate Function mapping */
+#define GPIO_PartialRemap_USART3        ((uint32_t)0x00140010) /* USART3 Partial Alternate Function mapping */
+#define GPIO_FullRemap_USART3           ((uint32_t)0x00140030) /* USART3 Full Alternate Function mapping */
+#define GPIO_PartialRemap_TIM1          ((uint32_t)0x00160040) /* TIM1 Partial Alternate Function mapping */
+#define GPIO_FullRemap_TIM1             ((uint32_t)0x001600C0) /* TIM1 Full Alternate Function mapping */
+#define GPIO_PartialRemap1_TIM2         ((uint32_t)0x00180100) /* TIM2 Partial1 Alternate Function mapping */
+#define GPIO_PartialRemap2_TIM2         ((uint32_t)0x00180200) /* TIM2 Partial2 Alternate Function mapping */
+#define GPIO_FullRemap_TIM2             ((uint32_t)0x00180300) /* TIM2 Full Alternate Function mapping */
+#define GPIO_PartialRemap_TIM3          ((uint32_t)0x001A0800) /* TIM3 Partial Alternate Function mapping */
+#define GPIO_FullRemap_TIM3             ((uint32_t)0x001A0C00) /* TIM3 Full Alternate Function mapping */
+#define GPIO_Remap_TIM4                 ((uint32_t)0x00001000) /* TIM4 Alternate Function mapping */
+#define GPIO_Remap1_CAN1                ((uint32_t)0x001D4000) /* CAN1 Alternate Function mapping */
+#define GPIO_Remap2_CAN1                ((uint32_t)0x001D6000) /* CAN1 Alternate Function mapping */
+#define GPIO_Remap_PD0PD1               ((uint32_t)0x00008000) /* PD0 and PD1 Alternate Function mapping */
+#define GPIO_Remap_TIM5CH4_LSI          ((uint32_t)0x00200001) /* LSI connected to TIM5 Channel4 input capture for calibration */
+#define GPIO_Remap_ADC1_ETRGINJ         ((uint32_t)0x00200002) /* ADC1 External Trigger Injected Conversion remapping */
+#define GPIO_Remap_ADC1_ETRGREG         ((uint32_t)0x00200004) /* ADC1 External Trigger Regular Conversion remapping */
+#define GPIO_Remap_ADC2_ETRGINJ         ((uint32_t)0x00200008) /* ADC2 External Trigger Injected Conversion remapping */
+#define GPIO_Remap_ADC2_ETRGREG         ((uint32_t)0x00200010) /* ADC2 External Trigger Regular Conversion remapping */
+#define GPIO_Remap_ETH                  ((uint32_t)0x00200020) /* Ethernet remapping (only for Connectivity line devices) */
+#define GPIO_Remap_CAN2                 ((uint32_t)0x00200040) /* CAN2 remapping (only for Connectivity line devices) */
+#define GPIO_Remap_MII_RMII_SEL         ((uint32_t)0x00200080) /* MII or RMII selection */
+#define GPIO_Remap_SWJ_Disable          ((uint32_t)0x00300400) /* Full SWJ Disabled */
+#define GPIO_Remap_SPI3                 ((uint32_t)0x00201000) /* SPI3/I2S3 Alternate Function mapping (only for Connectivity line devices) */
+#define GPIO_Remap_TIM2ITR1_PTP_SOF     ((uint32_t)0x00202000) /* Ethernet PTP output or USB OTG SOF (Start of Frame) connected \
+                                                                  to TIM2 Internal Trigger 1 for calibration                    \
+                                                                  (only for Connectivity line devices) */
+#define GPIO_Remap_PTP_PPS              ((uint32_t)0x00204000) /* Ethernet MAC PPS_PTS output on PB05 (only for Connectivity line devices) */
+#define GPIO_Remap_PD01                 GPIO_Remap_PD0PD1
+
+/* PCFR2 */
+#define GPIO_Remap_TIM8                 ((uint32_t)0x80000004) /* TIM8 Alternate Function mapping */
+#define GPIO_PartialRemap_TIM9          ((uint32_t)0x80130008) /* TIM9 Partial Alternate Function mapping */
+#define GPIO_FullRemap_TIM9             ((uint32_t)0x80130010) /* TIM9 Full Alternate Function mapping */
+#define GPIO_PartialRemap_TIM10         ((uint32_t)0x80150020) /* TIM10 Partial Alternate Function mapping */
+#define GPIO_FullRemap_TIM10            ((uint32_t)0x80150040) /* TIM10 Full Alternate Function mapping */
+#define GPIO_Remap_FSMC_NADV            ((uint32_t)0x80000400) /* FSMC_NADV Alternate Function mapping */
+#define GPIO_PartialRemap_USART4        ((uint32_t)0x80300001) /* USART4 Partial Alternate Function mapping */
+#define GPIO_FullRemap_USART4           ((uint32_t)0x80300002) /* USART4 Full Alternate Function mapping */
+#define GPIO_PartialRemap_USART5        ((uint32_t)0x80320004) /* USART5 Partial Alternate Function mapping */
+#define GPIO_FullRemap_USART5           ((uint32_t)0x80320008) /* USART5 Full Alternate Function mapping */
+#define GPIO_PartialRemap_USART6        ((uint32_t)0x80340010) /* USART6 Partial Alternate Function mapping */
+#define GPIO_FullRemap_USART6           ((uint32_t)0x80340020) /* USART6 Full Alternate Function mapping */
+#define GPIO_PartialRemap_USART7        ((uint32_t)0x80360040) /* USART7 Partial Alternate Function mapping */
+#define GPIO_FullRemap_USART7           ((uint32_t)0x80360080) /* USART7 Full Alternate Function mapping */
+#define GPIO_PartialRemap_USART8        ((uint32_t)0x80380100) /* USART8 Partial Alternate Function mapping */
+#define GPIO_FullRemap_USART8           ((uint32_t)0x80380200) /* USART8 Full Alternate Function mapping */
+#define GPIO_Remap_USART1_HighBit       ((uint32_t)0x80200400) /* USART1 Alternate Function mapping high bit */
+
+/* GPIO_Port_Sources */
+#define GPIO_PortSourceGPIOA            ((uint8_t)0x00)
+#define GPIO_PortSourceGPIOB            ((uint8_t)0x01)
+#define GPIO_PortSourceGPIOC            ((uint8_t)0x02)
+#define GPIO_PortSourceGPIOD            ((uint8_t)0x03)
+#define GPIO_PortSourceGPIOE            ((uint8_t)0x04)
+#define GPIO_PortSourceGPIOF            ((uint8_t)0x05)
+#define GPIO_PortSourceGPIOG            ((uint8_t)0x06)
+
+/* GPIO_Pin_sources */
+#define GPIO_PinSource0                 ((uint8_t)0x00)
+#define GPIO_PinSource1                 ((uint8_t)0x01)
+#define GPIO_PinSource2                 ((uint8_t)0x02)
+#define GPIO_PinSource3                 ((uint8_t)0x03)
+#define GPIO_PinSource4                 ((uint8_t)0x04)
+#define GPIO_PinSource5                 ((uint8_t)0x05)
+#define GPIO_PinSource6                 ((uint8_t)0x06)
+#define GPIO_PinSource7                 ((uint8_t)0x07)
+#define GPIO_PinSource8                 ((uint8_t)0x08)
+#define GPIO_PinSource9                 ((uint8_t)0x09)
+#define GPIO_PinSource10                ((uint8_t)0x0A)
+#define GPIO_PinSource11                ((uint8_t)0x0B)
+#define GPIO_PinSource12                ((uint8_t)0x0C)
+#define GPIO_PinSource13                ((uint8_t)0x0D)
+#define GPIO_PinSource14                ((uint8_t)0x0E)
+#define GPIO_PinSource15                ((uint8_t)0x0F)
+
+/* Ethernet_Media_Interface */
+#define GPIO_ETH_MediaInterface_MII     ((u32)0x00000000)
+#define GPIO_ETH_MediaInterface_RMII    ((u32)0x00000001)
+
+void     GPIO_DeInit(GPIO_TypeDef *GPIOx);
+void     GPIO_AFIODeInit(void);
+void     GPIO_Init(GPIO_TypeDef *GPIOx, GPIO_InitTypeDef *GPIO_InitStruct);
+void     GPIO_StructInit(GPIO_InitTypeDef *GPIO_InitStruct);
+uint8_t  GPIO_ReadInputDataBit(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin);
+uint16_t GPIO_ReadInputData(GPIO_TypeDef *GPIOx);
+uint8_t  GPIO_ReadOutputDataBit(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin);
+uint16_t GPIO_ReadOutputData(GPIO_TypeDef *GPIOx);
+void     GPIO_SetBits(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin);
+void     GPIO_ResetBits(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin);
+void     GPIO_WriteBit(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, BitAction BitVal);
+void     GPIO_Write(GPIO_TypeDef *GPIOx, uint16_t PortVal);
+void     GPIO_PinLockConfig(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin);
+void     GPIO_EventOutputConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource);
+void     GPIO_EventOutputCmd(FunctionalState NewState);
+void     GPIO_PinRemapConfig(uint32_t GPIO_Remap, FunctionalState NewState);
+void     GPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource);
+void     GPIO_ETH_MediaInterfaceConfig(uint32_t GPIO_ETH_MediaInterface);
+void     GPIO_IPD_Unused(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_i2c.h

@@ -0,0 +1,429 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_i2c.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      I2C firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_I2C_H
+#define __CH32V20x_I2C_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* I2C Init structure definition  */
+typedef struct
+{
+    uint32_t I2C_ClockSpeed; /* Specifies the clock frequency.
+                                This parameter must be set to a value lower than 400kHz */
+
+    uint16_t I2C_Mode; /* Specifies the I2C mode.
+                          This parameter can be a value of @ref I2C_mode */
+
+    uint16_t I2C_DutyCycle; /* Specifies the I2C fast mode duty cycle.
+                               This parameter can be a value of @ref I2C_duty_cycle_in_fast_mode */
+
+    uint16_t I2C_OwnAddress1; /* Specifies the first device own address.
+                                 This parameter can be a 7-bit or 10-bit address. */
+
+    uint16_t I2C_Ack; /* Enables or disables the acknowledgement.
+                         This parameter can be a value of @ref I2C_acknowledgement */
+
+    uint16_t I2C_AcknowledgedAddress; /* Specifies if 7-bit or 10-bit address is acknowledged.
+                                         This parameter can be a value of @ref I2C_acknowledged_address */
+} I2C_InitTypeDef;
+
+/* I2C_mode */
+#define I2C_Mode_I2C                                         ((uint16_t)0x0000)
+#define I2C_Mode_SMBusDevice                                 ((uint16_t)0x0002)
+#define I2C_Mode_SMBusHost                                   ((uint16_t)0x000A)
+
+/* I2C_duty_cycle_in_fast_mode */
+#define I2C_DutyCycle_16_9                                   ((uint16_t)0x4000) /* I2C fast mode Tlow/Thigh = 16/9 */
+#define I2C_DutyCycle_2                                      ((uint16_t)0xBFFF) /* I2C fast mode Tlow/Thigh = 2 */
+
+/* I2C_acknowledgement */
+#define I2C_Ack_Enable                                       ((uint16_t)0x0400)
+#define I2C_Ack_Disable                                      ((uint16_t)0x0000)
+
+/* I2C_transfer_direction */
+#define I2C_Direction_Transmitter                            ((uint8_t)0x00)
+#define I2C_Direction_Receiver                               ((uint8_t)0x01)
+
+/* I2C_acknowledged_address */
+#define I2C_AcknowledgedAddress_7bit                         ((uint16_t)0x4000)
+#define I2C_AcknowledgedAddress_10bit                        ((uint16_t)0xC000)
+
+/* I2C_registers */
+#define I2C_Register_CTLR1                                   ((uint8_t)0x00)
+#define I2C_Register_CTLR2                                   ((uint8_t)0x04)
+#define I2C_Register_OADDR1                                  ((uint8_t)0x08)
+#define I2C_Register_OADDR2                                  ((uint8_t)0x0C)
+#define I2C_Register_DATAR                                   ((uint8_t)0x10)
+#define I2C_Register_STAR1                                   ((uint8_t)0x14)
+#define I2C_Register_STAR2                                   ((uint8_t)0x18)
+#define I2C_Register_CKCFGR                                  ((uint8_t)0x1C)
+#define I2C_Register_RTR                                     ((uint8_t)0x20)
+
+/* I2C_SMBus_alert_pin_level */
+#define I2C_SMBusAlert_Low                                   ((uint16_t)0x2000)
+#define I2C_SMBusAlert_High                                  ((uint16_t)0xDFFF)
+
+/* I2C_PEC_position */
+#define I2C_PECPosition_Next                                 ((uint16_t)0x0800)
+#define I2C_PECPosition_Current                              ((uint16_t)0xF7FF)
+
+/* I2C_NACK_position */
+#define I2C_NACKPosition_Next                                ((uint16_t)0x0800)
+#define I2C_NACKPosition_Current                             ((uint16_t)0xF7FF)
+
+/* I2C_interrupts_definition */
+#define I2C_IT_BUF                                           ((uint16_t)0x0400)
+#define I2C_IT_EVT                                           ((uint16_t)0x0200)
+#define I2C_IT_ERR                                           ((uint16_t)0x0100)
+
+/* I2C_interrupts_definition */
+#define I2C_IT_SMBALERT                                      ((uint32_t)0x01008000)
+#define I2C_IT_TIMEOUT                                       ((uint32_t)0x01004000)
+#define I2C_IT_PECERR                                        ((uint32_t)0x01001000)
+#define I2C_IT_OVR                                           ((uint32_t)0x01000800)
+#define I2C_IT_AF                                            ((uint32_t)0x01000400)
+#define I2C_IT_ARLO                                          ((uint32_t)0x01000200)
+#define I2C_IT_BERR                                          ((uint32_t)0x01000100)
+#define I2C_IT_TXE                                           ((uint32_t)0x06000080)
+#define I2C_IT_RXNE                                          ((uint32_t)0x06000040)
+#define I2C_IT_STOPF                                         ((uint32_t)0x02000010)
+#define I2C_IT_ADD10                                         ((uint32_t)0x02000008)
+#define I2C_IT_BTF                                           ((uint32_t)0x02000004)
+#define I2C_IT_ADDR                                          ((uint32_t)0x02000002)
+#define I2C_IT_SB                                            ((uint32_t)0x02000001)
+
+/* SR2 register flags  */
+#define I2C_FLAG_DUALF                                       ((uint32_t)0x00800000)
+#define I2C_FLAG_SMBHOST                                     ((uint32_t)0x00400000)
+#define I2C_FLAG_SMBDEFAULT                                  ((uint32_t)0x00200000)
+#define I2C_FLAG_GENCALL                                     ((uint32_t)0x00100000)
+#define I2C_FLAG_TRA                                         ((uint32_t)0x00040000)
+#define I2C_FLAG_BUSY                                        ((uint32_t)0x00020000)
+#define I2C_FLAG_MSL                                         ((uint32_t)0x00010000)
+
+/* SR1 register flags */
+#define I2C_FLAG_SMBALERT                                    ((uint32_t)0x10008000)
+#define I2C_FLAG_TIMEOUT                                     ((uint32_t)0x10004000)
+#define I2C_FLAG_PECERR                                      ((uint32_t)0x10001000)
+#define I2C_FLAG_OVR                                         ((uint32_t)0x10000800)
+#define I2C_FLAG_AF                                          ((uint32_t)0x10000400)
+#define I2C_FLAG_ARLO                                        ((uint32_t)0x10000200)
+#define I2C_FLAG_BERR                                        ((uint32_t)0x10000100)
+#define I2C_FLAG_TXE                                         ((uint32_t)0x10000080)
+#define I2C_FLAG_RXNE                                        ((uint32_t)0x10000040)
+#define I2C_FLAG_STOPF                                       ((uint32_t)0x10000010)
+#define I2C_FLAG_ADD10                                       ((uint32_t)0x10000008)
+#define I2C_FLAG_BTF                                         ((uint32_t)0x10000004)
+#define I2C_FLAG_ADDR                                        ((uint32_t)0x10000002)
+#define I2C_FLAG_SB                                          ((uint32_t)0x10000001)
+
+/****************I2C Master Events (Events grouped in order of communication)********************/
+
+/******************************************************************************************************************** 
+  * @brief  Start communicate
+  * 
+  * After master use I2C_GenerateSTART() function sending the START condition,the master 
+  * has to wait for event 5(the Start condition has been correctly 
+  * released on the I2C bus ).
+  * 
+  */
+/* EVT5 */
+#define  I2C_EVENT_MASTER_MODE_SELECT                      ((uint32_t)0x00030001)  /* BUSY, MSL and SB flag */
+
+/********************************************************************************************************************
+  * @brief  Address Acknowledge
+  * 
+  * When start condition correctly released on the bus(check EVT5), the 
+  * master use I2C_Send7bitAddress() function sends the address of the slave(s) with which it will communicate 
+  * it also determines master as transmitter or Receiver. Then the master has to wait that a slave acknowledges 
+  * his address. If an acknowledge is sent on the bus, one of the following events will be set:
+  * 
+  *
+  * 
+  *  1) In case of Master Receiver (7-bit addressing): the I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED 
+  *     event is set.
+  *  
+  *  2) In case of Master Transmitter (7-bit addressing): the I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED 
+  *     is set
+  *  
+  *  3) In case of 10-Bit addressing mode, the master (after generating the START 
+  *  and checking on EVT5) use I2C_SendData() function send the header of 10-bit addressing mode.  
+  *  Then master wait EVT9. EVT9 means that the 10-bit addressing header has been correctly sent 
+  *  on the bus. Then master should use the function I2C_Send7bitAddress() to send the second part 
+  *  of the 10-bit address (LSB) . Then master should wait for event 6. 
+  *
+  *     
+  */
+
+/* EVT6 */
+#define  I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED        ((uint32_t)0x00070082)  /* BUSY, MSL, ADDR, TXE and TRA flags */
+#define  I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED           ((uint32_t)0x00030002)  /* BUSY, MSL and ADDR flags */
+/*EVT9 */
+#define  I2C_EVENT_MASTER_MODE_ADDRESS10                   ((uint32_t)0x00030008)  /* BUSY, MSL and ADD10 flags */
+
+/******************************************************************************************************************** 
+  * @brief Communication events
+  * 
+  * If START condition has generated and slave address 
+  * been acknowledged. then the master has to check one of the following events for 
+  * communication procedures:
+  *  
+  * 1) Master Receiver mode: The master has to wait on the event EVT7 then use  
+  *   I2C_ReceiveData() function to read the data received from the slave .
+  * 
+  * 2) Master Transmitter mode: The master use I2C_SendData() function to send data  
+  *     then to wait on event EVT8 or EVT8_2.
+  *    These two events are similar: 
+  *     - EVT8 means that the data has been written in the data register and is 
+  *       being shifted out.
+  *     - EVT8_2 means that the data has been physically shifted out and output 
+  *       on the bus.
+  *     In most cases, using EVT8 is sufficient for the application.
+  *     Using EVT8_2  will leads to a slower communication  speed but will more reliable .
+  *     EVT8_2 is also more suitable than EVT8 for testing on the last data transmission 
+  *    
+  *     
+  *  Note:
+  *  In case the  user software does not guarantee that this event EVT7 is managed before 
+  *  the current byte end of transfer, then user may check on I2C_EVENT_MASTER_BYTE_RECEIVED 
+  *  and I2C_FLAG_BTF flag at the same time .But in this case the communication may be slower.
+  *
+  * 
+  */
+
+/* Master Receive mode */ 
+/* EVT7 */
+#define  I2C_EVENT_MASTER_BYTE_RECEIVED                    ((uint32_t)0x00030040)  /* BUSY, MSL and RXNE flags */
+
+/* Master Transmitter mode*/
+/* EVT8 */
+#define I2C_EVENT_MASTER_BYTE_TRANSMITTING                 ((uint32_t)0x00070080) /* TRA, BUSY, MSL, TXE flags */
+/* EVT8_2 */
+#define  I2C_EVENT_MASTER_BYTE_TRANSMITTED                 ((uint32_t)0x00070084)  /* TRA, BUSY, MSL, TXE and BTF flags */
+
+/******************I2C Slave Events (Events grouped in order of communication)******************/
+
+/******************************************************************************************************************** 
+  * @brief  Start Communicate events
+  * 
+  * Wait on one of these events at the start of the communication. It means that 
+  * the I2C peripheral detected a start condition of master device generate on the bus.  
+  * If the acknowledge feature is enabled through function I2C_AcknowledgeConfig()),The peripheral generates an ACK condition on the bus. 
+  *    
+  *
+  *
+  * a) In normal case (only one address managed by the slave), when the address 
+  *   sent by the master matches the own address of the peripheral (configured by 
+  *   I2C_OwnAddress1 field) the I2C_EVENT_SLAVE_XXX_ADDRESS_MATCHED event is set 
+  *   (where XXX could be TRANSMITTER or RECEIVER).
+  *    
+  * b) In case the address sent by the master matches the second address of the 
+  *   peripheral (configured by the function I2C_OwnAddress2Config() and enabled 
+  *   by the function I2C_DualAddressCmd()) the events I2C_EVENT_SLAVE_XXX_SECONDADDRESS_MATCHED 
+  *   (where XXX could be TRANSMITTER or RECEIVER) are set.
+  *   
+  * c) In case the address sent by the master is General Call (address 0x00) and 
+  *   if the General Call is enabled for the peripheral (using function I2C_GeneralCallCmd()) 
+  *   the following event is set I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED.   
+  * 
+  */
+
+/* EVT1 */   
+/* a) Case of One Single Address managed by the slave */
+#define  I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED          ((uint32_t)0x00020002) /* BUSY and ADDR flags */
+#define  I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED       ((uint32_t)0x00060082) /* TRA, BUSY, TXE and ADDR flags */
+
+/* b) Case of Dual address managed by the slave */
+#define  I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED    ((uint32_t)0x00820000)  /* DUALF and BUSY flags */
+#define  I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED ((uint32_t)0x00860080)  /* DUALF, TRA, BUSY and TXE flags */
+
+/* c) Case of General Call enabled for the slave */
+#define  I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED        ((uint32_t)0x00120000)  /* GENCALL and BUSY flags */
+
+/******************************************************************************************************************** 
+  * @brief  Communication events
+  * 
+  * Wait on one of these events when EVT1 has already been checked : 
+  * 
+  * - Slave Receiver mode:
+  *     - EVT2--The device is expecting to receive a data byte . 
+  *     - EVT4--The device is expecting the end of the communication: master 
+  *       sends a stop condition and data transmission is stopped.
+  *    
+  * - Slave Transmitter mode:
+  *    - EVT3--When a byte has been transmitted by the slave and the Master is expecting 
+  *      the end of the byte transmission. The two events I2C_EVENT_SLAVE_BYTE_TRANSMITTED and
+  *      I2C_EVENT_SLAVE_BYTE_TRANSMITTING are similar. If the user software doesn't guarantee 
+  *      the EVT3 is managed before the current byte end of transfer The second one can optionally
+  *      be used. 
+  *    - EVT3_2--When the master sends a NACK  to tell slave device that data transmission 
+  *      shall end . The slave device has to stop sending 
+  *      data bytes and wait a Stop condition from bus.
+  *      
+  *  Note:
+  *  If the  user software does not guarantee that the event 2 is 
+  *  managed before the current byte end of transfer, User may check on I2C_EVENT_SLAVE_BYTE_RECEIVED 
+  *  and I2C_FLAG_BTF flag at the same time .
+  *  In this case the communication will be slower.
+  *
+  */
+
+/* Slave Receiver mode*/ 
+/* EVT2 */
+#define  I2C_EVENT_SLAVE_BYTE_RECEIVED                     ((uint32_t)0x00020040)  /* BUSY and RXNE flags */
+/* EVT4  */
+#define  I2C_EVENT_SLAVE_STOP_DETECTED                     ((uint32_t)0x00000010)  /* STOPF flag */
+
+/* Slave Transmitter mode*/
+/* EVT3 */
+#define  I2C_EVENT_SLAVE_BYTE_TRANSMITTED                  ((uint32_t)0x00060084)  /* TRA, BUSY, TXE and BTF flags */
+#define  I2C_EVENT_SLAVE_BYTE_TRANSMITTING                 ((uint32_t)0x00060080)  /* TRA, BUSY and TXE flags */
+/*EVT3_2 */
+#define  I2C_EVENT_SLAVE_ACK_FAILURE                       ((uint32_t)0x00000400)  /* AF flag */
+
+
+void     I2C_DeInit(I2C_TypeDef *I2Cx);
+void     I2C_Init(I2C_TypeDef *I2Cx, I2C_InitTypeDef *I2C_InitStruct);
+void     I2C_StructInit(I2C_InitTypeDef *I2C_InitStruct);
+void     I2C_Cmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_DMACmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_DMALastTransferCmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_GenerateSTART(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_GenerateSTOP(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_AcknowledgeConfig(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_OwnAddress2Config(I2C_TypeDef *I2Cx, uint8_t Address);
+void     I2C_DualAddressCmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_GeneralCallCmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_ITConfig(I2C_TypeDef *I2Cx, uint16_t I2C_IT, FunctionalState NewState);
+void     I2C_SendData(I2C_TypeDef *I2Cx, uint8_t Data);
+uint8_t  I2C_ReceiveData(I2C_TypeDef *I2Cx);
+void     I2C_Send7bitAddress(I2C_TypeDef *I2Cx, uint8_t Address, uint8_t I2C_Direction);
+uint16_t I2C_ReadRegister(I2C_TypeDef *I2Cx, uint8_t I2C_Register);
+void     I2C_SoftwareResetCmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_NACKPositionConfig(I2C_TypeDef *I2Cx, uint16_t I2C_NACKPosition);
+void     I2C_SMBusAlertConfig(I2C_TypeDef *I2Cx, uint16_t I2C_SMBusAlert);
+void     I2C_TransmitPEC(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_PECPositionConfig(I2C_TypeDef *I2Cx, uint16_t I2C_PECPosition);
+void     I2C_CalculatePEC(I2C_TypeDef *I2Cx, FunctionalState NewState);
+uint8_t  I2C_GetPEC(I2C_TypeDef *I2Cx);
+void     I2C_ARPCmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_StretchClockCmd(I2C_TypeDef *I2Cx, FunctionalState NewState);
+void     I2C_FastModeDutyCycleConfig(I2C_TypeDef *I2Cx, uint16_t I2C_DutyCycle);
+
+
+/*****************************************************************************************
+ *
+ *                         I2C State Monitoring Functions
+ *                       
+ ****************************************************************************************   
+ * This I2C driver provides three different ways for I2C state monitoring
+ *  profit the application requirements and constraints:
+ *        
+ *  
+ * a) First way:
+ *    Using I2C_CheckEvent() function:
+ *    It compares the status registers (STARR1 and STAR2) content to a given event
+ *    (can be the combination of more flags).
+ *    If the current status registers includes the given flags  will return SUCCESS.
+ *    and  if the current status registers miss flags will returns ERROR.
+ *    - When to use:
+ *      - This function is suitable for most applications as well as for startup 
+ *      activity since the events are fully described in the product reference manual 
+ *      (CH32FV2x-V3xRM).
+ *      - It is also suitable for users who need to define their own events.
+ *    - Limitations:
+ *      - If an error occurs besides to the monitored error,
+ *        the I2C_CheckEvent() function may return SUCCESS despite the communication
+ *       in corrupted state.  it is suggeted to use error interrupts to monitor the error
+ *        events and handle them in IRQ handler.
+ *
+ *        
+ *        Note: 
+ *        The following functions are recommended for error management: :
+ *          - I2C_ITConfig() main function of configure and enable the error interrupts.
+ *          - I2Cx_ER_IRQHandler() will be called when the error interrupt happen.
+ *            Where x is the peripheral instance (I2C1, I2C2 ...)
+ *          -  I2Cx_ER_IRQHandler() will call I2C_GetFlagStatus() or I2C_GetITStatus() functions
+ *            to determine which error occurred.
+ *          - I2C_ClearFlag() \ I2C_ClearITPendingBit() \ I2C_SoftwareResetCmd()
+ *            \ I2C_GenerateStop() will be use to clear the error flag and source,
+ *            and return to correct communication status.
+ *            
+ *
+ *  b) Second way:
+ *     Using the function to get a single word(uint32_t) composed of status register 1 and register 2. 
+ *     (Status Register 2 value is shifted left by 16 bits and concatenated to Status Register 1).
+ *     - When to use:
+ *
+ *       - This function is suitable for the same applications above but it 
+ *         don't have the limitations of I2C_GetFlagStatus() function .
+ *         The returned value could be compared to events already defined in the 
+ *         library (CH32V20x_i2c.h) or to custom values defined by user.
+ *       - This function can be used to monitor the status of multiple flags simultaneously.
+ *       - Contrary to the I2C_CheckEvent () function, this function can choose the time to
+ *         accept the event according to the user's needs (when all event flags are set and  
+ *         no other flags are set, or only when the required flags are set) 
+ *     
+ *     - Limitations:
+ *       - User may need to define his own events.
+ *       - Same remark concerning the error management is applicable for this 
+ *         function if user decides to check only regular communication flags (and 
+ *         ignores error flags).
+ *     
+ *
+ *  c) Third way:
+ *     Using the function I2C_GetFlagStatus() get the status of 
+ *     one single flag . 
+ *     - When to use:
+ *        - This function could be used for specific applications or in debug phase.
+ *        - It is suitable when only one flag checking is needed . 
+ *          
+ *     - Limitations: 
+ *        - Call this function to access the status register. Some flag bits may be cleared.           
+ *       - Function may need to be called twice or more in order to monitor one single event. 
+ */
+            
+ 
+
+/*********************************************************
+ * 
+ *  a) Basic state monitoring(First way)
+ ********************************************************
+ */
+ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT);
+/*********************************************************
+ * 
+ *  b) Advanced state monitoring(Second way:)
+ ********************************************************
+ */
+uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx);
+/*********************************************************
+ * 
+ *  c) Flag-based state monitoring(Third way)
+ *********************************************************
+ */
+FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG);
+
+void     I2C_ClearFlag(I2C_TypeDef *I2Cx, uint32_t I2C_FLAG);
+ITStatus I2C_GetITStatus(I2C_TypeDef *I2Cx, uint32_t I2C_IT);
+void     I2C_ClearITPendingBit(I2C_TypeDef *I2Cx, uint32_t I2C_IT);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_iwdg.h

@@ -0,0 +1,50 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_iwdg.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      IWDG firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_IWDG_H
+#define __CH32V20x_IWDG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* IWDG_WriteAccess */
+#define IWDG_WriteAccess_Enable     ((uint16_t)0x5555)
+#define IWDG_WriteAccess_Disable    ((uint16_t)0x0000)
+
+/* IWDG_prescaler */
+#define IWDG_Prescaler_4            ((uint8_t)0x00)
+#define IWDG_Prescaler_8            ((uint8_t)0x01)
+#define IWDG_Prescaler_16           ((uint8_t)0x02)
+#define IWDG_Prescaler_32           ((uint8_t)0x03)
+#define IWDG_Prescaler_64           ((uint8_t)0x04)
+#define IWDG_Prescaler_128          ((uint8_t)0x05)
+#define IWDG_Prescaler_256          ((uint8_t)0x06)
+
+/* IWDG_Flag */
+#define IWDG_FLAG_PVU               ((uint16_t)0x0001)
+#define IWDG_FLAG_RVU               ((uint16_t)0x0002)
+
+void       IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess);
+void       IWDG_SetPrescaler(uint8_t IWDG_Prescaler);
+void       IWDG_SetReload(uint16_t Reload);
+void       IWDG_ReloadCounter(void);
+void       IWDG_Enable(void);
+FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_misc.h

@@ -0,0 +1,72 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_misc.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      miscellaneous firmware library functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_MISC_H
+#define __CH32V20x_MISC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* CSR_INTSYSCR_INEST_definition */
+#define INTSYSCR_INEST_NoEN   0x00   /* interrupt nesting disable(CSR-0x804 bit1 = 0) */
+#define INTSYSCR_INEST_EN     0x01   /* interrupt nesting enable(CSR-0x804 bit1 = 1) */
+
+/* Check the configuration of CSR(0x804) in the startup file(.S)
+ *   interrupt nesting enable(CSR-0x804 bit1 = 1)
+ *     priority - bit[7] - Preemption Priority
+ *                bit[6:5] - Sub priority
+ *                bit[4:0] - Reserve
+ *   interrupt nesting disable(CSR-0x804 bit1 = 0)
+ *     priority - bit[7:5] - Sub priority
+ *                bit[4:0] - Reserve
+ */
+
+#ifndef INTSYSCR_INEST
+#define INTSYSCR_INEST   INTSYSCR_INEST_EN
+#endif
+
+/* NVIC Init Structure definition
+ *   interrupt nesting enable(CSR-0x804 bit1 = 1)
+ *     NVIC_IRQChannelPreemptionPriority - range from 0 to 1.
+ *     NVIC_IRQChannelSubPriority - range from 0 to 3.
+ *
+ *   interrupt nesting disable(CSR-0x804 bit1 = 0)
+ *     NVIC_IRQChannelPreemptionPriority - range is 0.
+ *     NVIC_IRQChannelSubPriority - range from 0 to 7.
+ *
+ */
+typedef struct
+{
+    uint8_t NVIC_IRQChannel;
+    uint8_t NVIC_IRQChannelPreemptionPriority;
+    uint8_t NVIC_IRQChannelSubPriority;
+    FunctionalState NVIC_IRQChannelCmd;
+} NVIC_InitTypeDef;
+
+/* Preemption_Priority_Group */
+#if (INTSYSCR_INEST == INTSYSCR_INEST_NoEN)
+#define NVIC_PriorityGroup_0           ((uint32_t)0x00) /* interrupt nesting disable(CSR-0x804 bit1 = 0) */
+#else
+#define NVIC_PriorityGroup_1           ((uint32_t)0x01) /* interrupt nesting enable(CSR-0x804 bit1 = 1) */
+#endif
+
+void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup);
+void NVIC_Init(NVIC_InitTypeDef *NVIC_InitStruct);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_opa.h

@@ -0,0 +1,74 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_opa.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      OPA firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_OPA_H
+#define __CH32V20x_OPA_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+#define OPA_PSEL_OFFSET    3
+#define OPA_NSEL_OFFSET    2
+#define OPA_MODE_OFFSET    1
+
+/* OPA member enumeration */
+typedef enum
+{
+    OPA1 = 0,
+    OPA2,
+    OPA3,
+    OPA4
+} OPA_Num_TypeDef;
+
+/* OPA PSEL enumeration */
+typedef enum
+{
+    CHP0 = 0,
+    CHP1
+} OPA_PSEL_TypeDef;
+
+/* OPA NSEL enumeration */
+typedef enum
+{
+    CHN0 = 0,
+    CHN1
+} OPA_NSEL_TypeDef;
+
+/* OPA out channel enumeration */
+typedef enum
+{
+    OUT_IO_OUT0 = 0,
+    OUT_IO_OUT1
+} OPA_Mode_TypeDef;
+
+/* OPA Init Structure definition */
+typedef struct
+{
+    OPA_Num_TypeDef  OPA_NUM; /* Specifies the members of OPA */
+    OPA_PSEL_TypeDef PSEL;    /* Specifies the positive channel of OPA */
+    OPA_NSEL_TypeDef NSEL;    /* Specifies the negative channel of OPA */
+    OPA_Mode_TypeDef Mode;    /* Specifies the mode of OPA */
+} OPA_InitTypeDef;
+
+void OPA_DeInit(void);
+void OPA_Init(OPA_InitTypeDef *OPA_InitStruct);
+void OPA_StructInit(OPA_InitTypeDef *OPA_InitStruct);
+void OPA_Cmd(OPA_Num_TypeDef OPA_NUM, FunctionalState NewState);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_pwr.h

@@ -0,0 +1,74 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_pwr.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the PWR
+ *                      firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_PWR_H
+#define __CH32V20x_PWR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* PVD_detection_level  */
+
+#define PWR_PVDLevel_MODE0          ((uint32_t)0x00000000)
+#define PWR_PVDLevel_MODE1          ((uint32_t)0x00000020)
+#define PWR_PVDLevel_MODE2          ((uint32_t)0x00000040)
+#define PWR_PVDLevel_MODE3          ((uint32_t)0x00000060)
+#define PWR_PVDLevel_MODE4          ((uint32_t)0x00000080)
+#define PWR_PVDLevel_MODE5          ((uint32_t)0x000000A0)
+#define PWR_PVDLevel_MODE6          ((uint32_t)0x000000C0)
+#define PWR_PVDLevel_MODE7          ((uint32_t)0x000000E0)
+
+#define PWR_PVDLevel_2V2            PWR_PVDLevel_MODE0
+#define PWR_PVDLevel_2V3            PWR_PVDLevel_MODE1
+#define PWR_PVDLevel_2V4            PWR_PVDLevel_MODE2
+#define PWR_PVDLevel_2V5            PWR_PVDLevel_MODE3
+#define PWR_PVDLevel_2V6            PWR_PVDLevel_MODE4
+#define PWR_PVDLevel_2V7            PWR_PVDLevel_MODE5
+#define PWR_PVDLevel_2V8            PWR_PVDLevel_MODE6
+#define PWR_PVDLevel_2V9            PWR_PVDLevel_MODE7
+
+/* Regulator_state_is_STOP_mode */
+#define PWR_Regulator_ON          ((uint32_t)0x00000000)
+#define PWR_Regulator_LowPower    ((uint32_t)0x00000001)
+
+/* STOP_mode_entry */
+#define PWR_STOPEntry_WFI         ((uint8_t)0x01)
+#define PWR_STOPEntry_WFE         ((uint8_t)0x02)
+
+/* PWR_Flag */
+#define PWR_FLAG_WU               ((uint32_t)0x00000001)
+#define PWR_FLAG_SB               ((uint32_t)0x00000002)
+#define PWR_FLAG_PVDO             ((uint32_t)0x00000004)
+
+void       PWR_DeInit(void);
+void       PWR_BackupAccessCmd(FunctionalState NewState);
+void       PWR_PVDCmd(FunctionalState NewState);
+void       PWR_PVDLevelConfig(uint32_t PWR_PVDLevel);
+void       PWR_WakeUpPinCmd(FunctionalState NewState);
+void       PWR_EnterSTOPMode(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry);
+void       PWR_EnterSTANDBYMode(void);
+FlagStatus PWR_GetFlagStatus(uint32_t PWR_FLAG);
+void       PWR_ClearFlag(uint32_t PWR_FLAG);
+void       PWR_EnterSTANDBYMode_RAM(void);
+void       PWR_EnterSTANDBYMode_RAM_LV(void);
+void       PWR_EnterSTANDBYMode_RAM_VBAT_EN(void);
+void       PWR_EnterSTANDBYMode_RAM_LV_VBAT_EN(void);
+void       PWR_EnterSTOPMode_RAM_LV(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_rcc.h

@@ -0,0 +1,264 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_rcc.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/02/21
+ * Description        : This file provides all the RCC firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_RCC_H
+#define __CH32V20x_RCC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* RCC_Exported_Types */
+typedef struct
+{
+    uint32_t SYSCLK_Frequency; /* returns SYSCLK clock frequency expressed in Hz */
+    uint32_t HCLK_Frequency;   /* returns HCLK clock frequency expressed in Hz */
+    uint32_t PCLK1_Frequency;  /* returns PCLK1 clock frequency expressed in Hz */
+    uint32_t PCLK2_Frequency;  /* returns PCLK2 clock frequency expressed in Hz */
+    uint32_t ADCCLK_Frequency; /* returns ADCCLK clock frequency expressed in Hz */
+} RCC_ClocksTypeDef;
+
+/* HSE_configuration */
+#define RCC_HSE_OFF                     ((uint32_t)0x00000000)
+#define RCC_HSE_ON                      ((uint32_t)0x00010000)
+#define RCC_HSE_Bypass                  ((uint32_t)0x00040000)
+
+/* PLL_entry_clock_source */
+#define RCC_PLLSource_HSI_Div2          ((uint32_t)0x00000000)
+#define RCC_PLLSource_HSE_Div1          ((uint32_t)0x00010000)
+#define RCC_PLLSource_HSE_Div2          ((uint32_t)0x00030000)
+
+/* PLL_multiplication_factor for other CH32V20x  */
+#define RCC_PLLMul_2                    ((uint32_t)0x00000000)
+#define RCC_PLLMul_3                    ((uint32_t)0x00040000)
+#define RCC_PLLMul_4                    ((uint32_t)0x00080000)
+#define RCC_PLLMul_5                    ((uint32_t)0x000C0000)
+#define RCC_PLLMul_6                    ((uint32_t)0x00100000)
+#define RCC_PLLMul_7                    ((uint32_t)0x00140000)
+#define RCC_PLLMul_8                    ((uint32_t)0x00180000)
+#define RCC_PLLMul_9                    ((uint32_t)0x001C0000)
+#define RCC_PLLMul_10                   ((uint32_t)0x00200000)
+#define RCC_PLLMul_11                   ((uint32_t)0x00240000)
+#define RCC_PLLMul_12                   ((uint32_t)0x00280000)
+#define RCC_PLLMul_13                   ((uint32_t)0x002C0000)
+#define RCC_PLLMul_14                   ((uint32_t)0x00300000)
+#define RCC_PLLMul_15                   ((uint32_t)0x00340000)
+#define RCC_PLLMul_16                   ((uint32_t)0x00380000)
+#define RCC_PLLMul_18                   ((uint32_t)0x003C0000)
+
+/* System_clock_source */
+#define RCC_SYSCLKSource_HSI            ((uint32_t)0x00000000)
+#define RCC_SYSCLKSource_HSE            ((uint32_t)0x00000001)
+#define RCC_SYSCLKSource_PLLCLK         ((uint32_t)0x00000002)
+
+/* AHB_clock_source */
+#define RCC_SYSCLK_Div1                 ((uint32_t)0x00000000)
+#define RCC_SYSCLK_Div2                 ((uint32_t)0x00000080)
+#define RCC_SYSCLK_Div4                 ((uint32_t)0x00000090)
+#define RCC_SYSCLK_Div8                 ((uint32_t)0x000000A0)
+#define RCC_SYSCLK_Div16                ((uint32_t)0x000000B0)
+#define RCC_SYSCLK_Div64                ((uint32_t)0x000000C0)
+#define RCC_SYSCLK_Div128               ((uint32_t)0x000000D0)
+#define RCC_SYSCLK_Div256               ((uint32_t)0x000000E0)
+#define RCC_SYSCLK_Div512               ((uint32_t)0x000000F0)
+
+/* APB1_APB2_clock_source */
+#define RCC_HCLK_Div1                   ((uint32_t)0x00000000)
+#define RCC_HCLK_Div2                   ((uint32_t)0x00000400)
+#define RCC_HCLK_Div4                   ((uint32_t)0x00000500)
+#define RCC_HCLK_Div8                   ((uint32_t)0x00000600)
+#define RCC_HCLK_Div16                  ((uint32_t)0x00000700)
+
+/* RCC_Interrupt_source */
+#define RCC_IT_LSIRDY                   ((uint8_t)0x01)
+#define RCC_IT_LSERDY                   ((uint8_t)0x02)
+#define RCC_IT_HSIRDY                   ((uint8_t)0x04)
+#define RCC_IT_HSERDY                   ((uint8_t)0x08)
+#define RCC_IT_PLLRDY                   ((uint8_t)0x10)
+#define RCC_IT_CSS                      ((uint8_t)0x80)
+
+/* USB_Device_clock_source */
+#define RCC_USBCLKSource_PLLCLK_Div1    ((uint8_t)0x00)
+#define RCC_USBCLKSource_PLLCLK_Div2    ((uint8_t)0x01)
+#define RCC_USBCLKSource_PLLCLK_Div3    ((uint8_t)0x02)
+
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+  #define RCC_USBCLKSource_PLLCLK_Div5    ((uint8_t)0x03)
+
+#endif
+
+/* ADC_clock_source */
+#define RCC_PCLK2_Div2                 ((uint32_t)0x00000000)
+#define RCC_PCLK2_Div4                 ((uint32_t)0x00004000)
+#define RCC_PCLK2_Div6                 ((uint32_t)0x00008000)
+#define RCC_PCLK2_Div8                 ((uint32_t)0x0000C000)
+
+/* LSE_configuration */
+#define RCC_LSE_OFF                    ((uint8_t)0x00)
+#define RCC_LSE_ON                     ((uint8_t)0x01)
+#define RCC_LSE_Bypass                 ((uint8_t)0x04)
+
+/* RTC_clock_source */
+#define RCC_RTCCLKSource_LSE           ((uint32_t)0x00000100)
+#define RCC_RTCCLKSource_LSI           ((uint32_t)0x00000200)
+
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+#define RCC_RTCCLKSource_HSE_Div512    ((uint32_t)0x00000300)
+#else
+#define RCC_RTCCLKSource_HSE_Div128    ((uint32_t)0x00000300)
+#endif
+
+/* AHB_peripheral */
+#define RCC_AHBPeriph_DMA1             ((uint32_t)0x00000001)
+#define RCC_AHBPeriph_DMA2             ((uint32_t)0x00000002)
+#define RCC_AHBPeriph_SRAM             ((uint32_t)0x00000004)
+#define RCC_AHBPeriph_CRC              ((uint32_t)0x00000040)
+#define RCC_AHBPeriph_FSMC             ((uint32_t)0x00000100)
+#define RCC_AHBPeriph_RNG              ((uint32_t)0x00000200)
+#define RCC_AHBPeriph_SDIO             ((uint32_t)0x00000400)
+#define RCC_AHBPeriph_USBHS            ((uint32_t)0x00000800)
+#define RCC_AHBPeriph_USBFS            ((uint32_t)0x00001000)
+#define RCC_AHBPeriph_OTG_FS           RCC_AHBPeriph_USBFS
+
+#ifdef CH32V20x_D8W
+#define RCC_AHBPeriph_BLE_CRC          ((uint32_t)0x00030040)
+#endif
+
+/* APB2_peripheral */
+#define RCC_APB2Periph_AFIO            ((uint32_t)0x00000001)
+#define RCC_APB2Periph_GPIOA           ((uint32_t)0x00000004)
+#define RCC_APB2Periph_GPIOB           ((uint32_t)0x00000008)
+#define RCC_APB2Periph_GPIOC           ((uint32_t)0x00000010)
+#define RCC_APB2Periph_GPIOD           ((uint32_t)0x00000020)
+#define RCC_APB2Periph_GPIOE           ((uint32_t)0x00000040)
+#define RCC_APB2Periph_ADC1            ((uint32_t)0x00000200)
+#define RCC_APB2Periph_ADC2            ((uint32_t)0x00000400)
+#define RCC_APB2Periph_TIM1            ((uint32_t)0x00000800)
+#define RCC_APB2Periph_SPI1            ((uint32_t)0x00001000)
+#define RCC_APB2Periph_TIM8            ((uint32_t)0x00002000)
+#define RCC_APB2Periph_USART1          ((uint32_t)0x00004000)
+#define RCC_APB2Periph_TIM9            ((uint32_t)0x00080000)
+#define RCC_APB2Periph_TIM10           ((uint32_t)0x00100000)
+
+/* APB1_peripheral */
+#define RCC_APB1Periph_TIM2            ((uint32_t)0x00000001)
+#define RCC_APB1Periph_TIM3            ((uint32_t)0x00000002)
+#define RCC_APB1Periph_TIM4            ((uint32_t)0x00000004)
+#define RCC_APB1Periph_TIM5            ((uint32_t)0x00000008)
+#define RCC_APB1Periph_TIM6            ((uint32_t)0x00000010)
+#define RCC_APB1Periph_TIM7            ((uint32_t)0x00000020)
+#define RCC_APB1Periph_UART6           ((uint32_t)0x00000040)
+#define RCC_APB1Periph_UART7           ((uint32_t)0x00000080)
+#define RCC_APB1Periph_UART8           ((uint32_t)0x00000100)
+#define RCC_APB1Periph_WWDG            ((uint32_t)0x00000800)
+#define RCC_APB1Periph_SPI2            ((uint32_t)0x00004000)
+#define RCC_APB1Periph_SPI3            ((uint32_t)0x00008000)
+#define RCC_APB1Periph_USART2          ((uint32_t)0x00020000)
+#define RCC_APB1Periph_USART3          ((uint32_t)0x00040000)
+#define RCC_APB1Periph_UART4           ((uint32_t)0x00080000)
+#define RCC_APB1Periph_UART5           ((uint32_t)0x00100000)
+#define RCC_APB1Periph_I2C1            ((uint32_t)0x00200000)
+#define RCC_APB1Periph_I2C2            ((uint32_t)0x00400000)
+#define RCC_APB1Periph_USB             ((uint32_t)0x00800000)
+#define RCC_APB1Periph_CAN1            ((uint32_t)0x02000000)
+#define RCC_APB1Periph_CAN2            ((uint32_t)0x04000000)
+#define RCC_APB1Periph_BKP             ((uint32_t)0x08000000)
+#define RCC_APB1Periph_PWR             ((uint32_t)0x10000000)
+#define RCC_APB1Periph_DAC             ((uint32_t)0x20000000)
+
+/* Clock_source_to_output_on_MCO_pin */
+#define RCC_MCO_NoClock                ((uint8_t)0x00)
+#define RCC_MCO_SYSCLK                 ((uint8_t)0x04)
+#define RCC_MCO_HSI                    ((uint8_t)0x05)
+#define RCC_MCO_HSE                    ((uint8_t)0x06)
+#define RCC_MCO_PLLCLK_Div2            ((uint8_t)0x07)
+
+/* RCC_Flag */
+#define RCC_FLAG_HSIRDY                ((uint8_t)0x21)
+#define RCC_FLAG_HSERDY                ((uint8_t)0x31)
+#define RCC_FLAG_PLLRDY                ((uint8_t)0x39)
+#define RCC_FLAG_LSERDY                ((uint8_t)0x41)
+#define RCC_FLAG_LSIRDY                ((uint8_t)0x61)
+#define RCC_FLAG_PINRST                ((uint8_t)0x7A)
+#define RCC_FLAG_PORRST                ((uint8_t)0x7B)
+#define RCC_FLAG_SFTRST                ((uint8_t)0x7C)
+#define RCC_FLAG_IWDGRST               ((uint8_t)0x7D)
+#define RCC_FLAG_WWDGRST               ((uint8_t)0x7E)
+#define RCC_FLAG_LPWRRST               ((uint8_t)0x7F)
+
+/* SysTick_clock_source */
+#define SysTick_CLKSource_HCLK_Div8    ((uint32_t)0xFFFFFFFB)
+#define SysTick_CLKSource_HCLK         ((uint32_t)0x00000004)
+
+/* USBFS_clock_source */
+#define RCC_USBPLL_Div1                ((uint32_t)0x00)
+#define RCC_USBPLL_Div2                ((uint32_t)0x01)
+#define RCC_USBPLL_Div3                ((uint32_t)0x02)
+#define RCC_USBPLL_Div4                ((uint32_t)0x03)
+#define RCC_USBPLL_Div5                ((uint32_t)0x04)
+#define RCC_USBPLL_Div6                ((uint32_t)0x05)
+#define RCC_USBPLL_Div7                ((uint32_t)0x06)
+#define RCC_USBPLL_Div8                ((uint32_t)0x07)
+
+/* ETH_clock_source */
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+  #define RCC_ETHCLK_Div1    ((uint32_t)0x00)
+  #define RCC_ETHCLK_Div2    ((uint32_t)0x01)
+
+#endif
+
+void        RCC_DeInit(void);
+void        RCC_HSEConfig(uint32_t RCC_HSE);
+ErrorStatus RCC_WaitForHSEStartUp(void);
+void        RCC_AdjustHSICalibrationValue(uint8_t HSICalibrationValue);
+void        RCC_HSICmd(FunctionalState NewState);
+void        RCC_PLLConfig(uint32_t RCC_PLLSource, uint32_t RCC_PLLMul);
+void        RCC_PLLCmd(FunctionalState NewState);
+void        RCC_SYSCLKConfig(uint32_t RCC_SYSCLKSource);
+uint8_t     RCC_GetSYSCLKSource(void);
+void        RCC_HCLKConfig(uint32_t RCC_SYSCLK);
+void        RCC_PCLK1Config(uint32_t RCC_HCLK);
+void        RCC_PCLK2Config(uint32_t RCC_HCLK);
+void        RCC_ITConfig(uint8_t RCC_IT, FunctionalState NewState);
+void        RCC_USBCLKConfig(uint32_t RCC_USBCLKSource);
+void        RCC_ADCCLKConfig(uint32_t RCC_PCLK2);
+void        RCC_LSEConfig(uint8_t RCC_LSE);
+void        RCC_LSICmd(FunctionalState NewState);
+void        RCC_RTCCLKConfig(uint32_t RCC_RTCCLKSource);
+void        RCC_RTCCLKCmd(FunctionalState NewState);
+void        RCC_GetClocksFreq(RCC_ClocksTypeDef *RCC_Clocks);
+void        RCC_AHBPeriphClockCmd(uint32_t RCC_AHBPeriph, FunctionalState NewState);
+void        RCC_APB2PeriphClockCmd(uint32_t RCC_APB2Periph, FunctionalState NewState);
+void        RCC_APB1PeriphClockCmd(uint32_t RCC_APB1Periph, FunctionalState NewState);
+void        RCC_APB2PeriphResetCmd(uint32_t RCC_APB2Periph, FunctionalState NewState);
+void        RCC_APB1PeriphResetCmd(uint32_t RCC_APB1Periph, FunctionalState NewState);
+void        RCC_BackupResetCmd(FunctionalState NewState);
+void        RCC_ClockSecuritySystemCmd(FunctionalState NewState);
+void        RCC_MCOConfig(uint8_t RCC_MCO);
+FlagStatus  RCC_GetFlagStatus(uint8_t RCC_FLAG);
+void        RCC_ClearFlag(void);
+ITStatus    RCC_GetITStatus(uint8_t RCC_IT);
+void        RCC_ClearITPendingBit(uint8_t RCC_IT);
+void        RCC_ADCCLKADJcmd(FunctionalState NewState);
+FlagStatus  RCC_USB5PRE_JUDGE();
+
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+void RCC_ETHDIVConfig(uint32_t RCC_ETHPRE_Div);
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_rtc.h

@@ -0,0 +1,98 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_rtc.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the RTC
+ *                      firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_RTC_H
+#define __CH32V20x_RTC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+typedef enum
+{
+    Level_32 = 2,
+    Level_64,
+    Level_128,
+
+} Cali_LevelTypeDef;
+
+/* RTC_interrupts_define */
+#define RTC_IT_OW         ((uint16_t)0x0004) /* Overflow interrupt */
+#define RTC_IT_ALR        ((uint16_t)0x0002) /* Alarm interrupt */
+#define RTC_IT_SEC        ((uint16_t)0x0001) /* Second interrupt */
+
+/* RTC_interrupts_flags */
+#define RTC_FLAG_RTOFF    ((uint16_t)0x0020) /* RTC Operation OFF flag */
+#define RTC_FLAG_RSF      ((uint16_t)0x0008) /* Registers Synchronized flag */
+#define RTC_FLAG_OW       ((uint16_t)0x0004) /* Overflow flag */
+#define RTC_FLAG_ALR      ((uint16_t)0x0002) /* Alarm flag */
+#define RTC_FLAG_SEC      ((uint16_t)0x0001) /* Second flag */
+
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+#define RB_OSC32K_HTUNE       (0x1FE0)
+#define RB_OSC32K_LTUNE       (0x1F)
+
+#define RB_OSC_CAL_HALT       (0x80)
+#define RB_OSC_CAL_EN         (0x02)
+#define RB_OSC_CAL_INT_EN     (0x01)
+
+#define RB_OSC_CAL_OV_CNT     (0xFF)
+
+#define RB_OSC_CAL_IF_END     (1 << 15)
+#define RB_OSC_CAL_CNT_OV     (1 << 14)
+#define RB_OSC_CAL_CNT        (0x3FFF)
+
+#define RB_CAL_LP_EN          (1 << 6)
+#define RB_CAL_WKUP_EN        (1 << 5)
+#define RB_OSC_HALT_MD        (1 << 4)
+#define RB_OSC_CNT_VLU        (0x0F)
+
+
+#ifdef CLK_OSC32K
+#if ( CLK_OSC32K == 1 )
+#define CAB_LSIFQ       32000
+#else
+#define CAB_LSIFQ       32768
+#endif
+#else
+#define CAB_LSIFQ       32000
+#endif
+#endif
+
+
+void       RTC_ITConfig(uint16_t RTC_IT, FunctionalState NewState);
+void       RTC_EnterConfigMode(void);
+void       RTC_ExitConfigMode(void);
+uint32_t   RTC_GetCounter(void);
+void       RTC_SetCounter(uint32_t CounterValue);
+void       RTC_SetPrescaler(uint32_t PrescalerValue);
+void       RTC_SetAlarm(uint32_t AlarmValue);
+uint32_t   RTC_GetDivider(void);
+void       RTC_WaitForLastTask(void);
+void       RTC_WaitForSynchro(void);
+FlagStatus RTC_GetFlagStatus(uint16_t RTC_FLAG);
+void       RTC_ClearFlag(uint16_t RTC_FLAG);
+ITStatus   RTC_GetITStatus(uint16_t RTC_IT);
+void       RTC_ClearITPendingBit(uint16_t RTC_IT);
+
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+void Calibration_LSI(Cali_LevelTypeDef cali_Lv);
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_spi.h

@@ -0,0 +1,220 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_spi.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      SPI firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_SPI_H
+#define __CH32V20x_SPI_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* SPI Init structure definition */
+typedef struct
+{
+    uint16_t SPI_Direction; /* Specifies the SPI unidirectional or bidirectional data mode.
+                               This parameter can be a value of @ref SPI_data_direction */
+
+    uint16_t SPI_Mode; /* Specifies the SPI operating mode.
+                          This parameter can be a value of @ref SPI_mode */
+
+    uint16_t SPI_DataSize; /* Specifies the SPI data size.
+                              This parameter can be a value of @ref SPI_data_size */
+
+    uint16_t SPI_CPOL; /* Specifies the serial clock steady state.
+                          This parameter can be a value of @ref SPI_Clock_Polarity */
+
+    uint16_t SPI_CPHA; /* Specifies the clock active edge for the bit capture.
+                          This parameter can be a value of @ref SPI_Clock_Phase */
+
+    uint16_t SPI_NSS; /* Specifies whether the NSS signal is managed by
+                         hardware (NSS pin) or by software using the SSI bit.
+                         This parameter can be a value of @ref SPI_Slave_Select_management */
+
+    uint16_t SPI_BaudRatePrescaler; /* Specifies the Baud Rate prescaler value which will be
+                                       used to configure the transmit and receive SCK clock.
+                                       This parameter can be a value of @ref SPI_BaudRate_Prescaler.
+                                       @note The communication clock is derived from the master
+                                             clock. The slave clock does not need to be set. */
+
+    uint16_t SPI_FirstBit; /* Specifies whether data transfers start from MSB or LSB bit.
+                              This parameter can be a value of @ref SPI_MSB_LSB_transmission */
+
+    uint16_t SPI_CRCPolynomial; /* Specifies the polynomial used for the CRC calculation. */
+} SPI_InitTypeDef;
+
+/* I2S Init structure definition */
+typedef struct
+{
+    uint16_t I2S_Mode; /* Specifies the I2S operating mode.
+                          This parameter can be a value of @ref I2S_Mode */
+
+    uint16_t I2S_Standard; /* Specifies the standard used for the I2S communication.
+                              This parameter can be a value of @ref I2S_Standard */
+
+    uint16_t I2S_DataFormat; /* Specifies the data format for the I2S communication.
+                                This parameter can be a value of @ref I2S_Data_Format */
+
+    uint16_t I2S_MCLKOutput; /* Specifies whether the I2S MCLK output is enabled or not.
+                                This parameter can be a value of @ref I2S_MCLK_Output */
+
+    uint32_t I2S_AudioFreq; /* Specifies the frequency selected for the I2S communication.
+                               This parameter can be a value of @ref I2S_Audio_Frequency */
+
+    uint16_t I2S_CPOL; /* Specifies the idle state of the I2S clock.
+                          This parameter can be a value of @ref I2S_Clock_Polarity */
+} I2S_InitTypeDef;
+
+/* SPI_data_direction */
+#define SPI_Direction_2Lines_FullDuplex    ((uint16_t)0x0000)
+#define SPI_Direction_2Lines_RxOnly        ((uint16_t)0x0400)
+#define SPI_Direction_1Line_Rx             ((uint16_t)0x8000)
+#define SPI_Direction_1Line_Tx             ((uint16_t)0xC000)
+
+/* SPI_mode */
+#define SPI_Mode_Master                    ((uint16_t)0x0104)
+#define SPI_Mode_Slave                     ((uint16_t)0x0000)
+
+/* SPI_data_size */
+#define SPI_DataSize_16b                   ((uint16_t)0x0800)
+#define SPI_DataSize_8b                    ((uint16_t)0x0000)
+
+/* SPI_Clock_Polarity */
+#define SPI_CPOL_Low                       ((uint16_t)0x0000)
+#define SPI_CPOL_High                      ((uint16_t)0x0002)
+
+/* SPI_Clock_Phase */
+#define SPI_CPHA_1Edge                     ((uint16_t)0x0000)
+#define SPI_CPHA_2Edge                     ((uint16_t)0x0001)
+
+/* SPI_Slave_Select_management */
+#define SPI_NSS_Soft                       ((uint16_t)0x0200)
+#define SPI_NSS_Hard                       ((uint16_t)0x0000)
+
+/* SPI_BaudRate_Prescaler */
+#define SPI_BaudRatePrescaler_2            ((uint16_t)0x0000)
+#define SPI_BaudRatePrescaler_4            ((uint16_t)0x0008)
+#define SPI_BaudRatePrescaler_8            ((uint16_t)0x0010)
+#define SPI_BaudRatePrescaler_16           ((uint16_t)0x0018)
+#define SPI_BaudRatePrescaler_32           ((uint16_t)0x0020)
+#define SPI_BaudRatePrescaler_64           ((uint16_t)0x0028)
+#define SPI_BaudRatePrescaler_128          ((uint16_t)0x0030)
+#define SPI_BaudRatePrescaler_256          ((uint16_t)0x0038)
+
+/* SPI_MSB_LSB_transmission */
+#define SPI_FirstBit_MSB                   ((uint16_t)0x0000)
+#define SPI_FirstBit_LSB                   ((uint16_t)0x0080)
+
+/* I2S_Mode */
+#define I2S_Mode_SlaveTx                   ((uint16_t)0x0000)
+#define I2S_Mode_SlaveRx                   ((uint16_t)0x0100)
+#define I2S_Mode_MasterTx                  ((uint16_t)0x0200)
+#define I2S_Mode_MasterRx                  ((uint16_t)0x0300)
+
+/* I2S_Standard */
+#define I2S_Standard_Phillips              ((uint16_t)0x0000)
+#define I2S_Standard_MSB                   ((uint16_t)0x0010)
+#define I2S_Standard_LSB                   ((uint16_t)0x0020)
+#define I2S_Standard_PCMShort              ((uint16_t)0x0030)
+#define I2S_Standard_PCMLong               ((uint16_t)0x00B0)
+
+/* I2S_Data_Format */
+#define I2S_DataFormat_16b                 ((uint16_t)0x0000)
+#define I2S_DataFormat_16bextended         ((uint16_t)0x0001)
+#define I2S_DataFormat_24b                 ((uint16_t)0x0003)
+#define I2S_DataFormat_32b                 ((uint16_t)0x0005)
+
+/* I2S_MCLK_Output */
+#define I2S_MCLKOutput_Enable              ((uint16_t)0x0200)
+#define I2S_MCLKOutput_Disable             ((uint16_t)0x0000)
+
+/* I2S_Audio_Frequency */
+#define I2S_AudioFreq_192k                 ((uint32_t)192000)
+#define I2S_AudioFreq_96k                  ((uint32_t)96000)
+#define I2S_AudioFreq_48k                  ((uint32_t)48000)
+#define I2S_AudioFreq_44k                  ((uint32_t)44100)
+#define I2S_AudioFreq_32k                  ((uint32_t)32000)
+#define I2S_AudioFreq_22k                  ((uint32_t)22050)
+#define I2S_AudioFreq_16k                  ((uint32_t)16000)
+#define I2S_AudioFreq_11k                  ((uint32_t)11025)
+#define I2S_AudioFreq_8k                   ((uint32_t)8000)
+#define I2S_AudioFreq_Default              ((uint32_t)2)
+
+/* I2S_Clock_Polarity */
+#define I2S_CPOL_Low                       ((uint16_t)0x0000)
+#define I2S_CPOL_High                      ((uint16_t)0x0008)
+
+/* SPI_I2S_DMA_transfer_requests */
+#define SPI_I2S_DMAReq_Tx                  ((uint16_t)0x0002)
+#define SPI_I2S_DMAReq_Rx                  ((uint16_t)0x0001)
+
+/* SPI_NSS_internal_software_management */
+#define SPI_NSSInternalSoft_Set            ((uint16_t)0x0100)
+#define SPI_NSSInternalSoft_Reset          ((uint16_t)0xFEFF)
+
+/* SPI_CRC_Transmit_Receive */
+#define SPI_CRC_Tx                         ((uint8_t)0x00)
+#define SPI_CRC_Rx                         ((uint8_t)0x01)
+
+/* SPI_direction_transmit_receive */
+#define SPI_Direction_Rx                   ((uint16_t)0xBFFF)
+#define SPI_Direction_Tx                   ((uint16_t)0x4000)
+
+/* SPI_I2S_interrupts_definition */
+#define SPI_I2S_IT_TXE                     ((uint8_t)0x71)
+#define SPI_I2S_IT_RXNE                    ((uint8_t)0x60)
+#define SPI_I2S_IT_ERR                     ((uint8_t)0x50)
+#define SPI_I2S_IT_OVR                     ((uint8_t)0x56)
+#define SPI_IT_MODF                        ((uint8_t)0x55)
+#define SPI_IT_CRCERR                      ((uint8_t)0x54)
+#define I2S_IT_UDR                         ((uint8_t)0x53)
+
+/* SPI_I2S_flags_definition */
+#define SPI_I2S_FLAG_RXNE                  ((uint16_t)0x0001)
+#define SPI_I2S_FLAG_TXE                   ((uint16_t)0x0002)
+#define I2S_FLAG_CHSIDE                    ((uint16_t)0x0004)
+#define I2S_FLAG_UDR                       ((uint16_t)0x0008)
+#define SPI_FLAG_CRCERR                    ((uint16_t)0x0010)
+#define SPI_FLAG_MODF                      ((uint16_t)0x0020)
+#define SPI_I2S_FLAG_OVR                   ((uint16_t)0x0040)
+#define SPI_I2S_FLAG_BSY                   ((uint16_t)0x0080)
+
+void       SPI_I2S_DeInit(SPI_TypeDef *SPIx);
+void       SPI_Init(SPI_TypeDef *SPIx, SPI_InitTypeDef *SPI_InitStruct);
+void       I2S_Init(SPI_TypeDef *SPIx, I2S_InitTypeDef *I2S_InitStruct);
+void       SPI_StructInit(SPI_InitTypeDef *SPI_InitStruct);
+void       I2S_StructInit(I2S_InitTypeDef *I2S_InitStruct);
+void       SPI_Cmd(SPI_TypeDef *SPIx, FunctionalState NewState);
+void       I2S_Cmd(SPI_TypeDef *SPIx, FunctionalState NewState);
+void       SPI_I2S_ITConfig(SPI_TypeDef *SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState);
+void       SPI_I2S_DMACmd(SPI_TypeDef *SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState NewState);
+void       SPI_I2S_SendData(SPI_TypeDef *SPIx, uint16_t Data);
+uint16_t   SPI_I2S_ReceiveData(SPI_TypeDef *SPIx);
+void       SPI_NSSInternalSoftwareConfig(SPI_TypeDef *SPIx, uint16_t SPI_NSSInternalSoft);
+void       SPI_SSOutputCmd(SPI_TypeDef *SPIx, FunctionalState NewState);
+void       SPI_DataSizeConfig(SPI_TypeDef *SPIx, uint16_t SPI_DataSize);
+void       SPI_TransmitCRC(SPI_TypeDef *SPIx);
+void       SPI_CalculateCRC(SPI_TypeDef *SPIx, FunctionalState NewState);
+uint16_t   SPI_GetCRC(SPI_TypeDef *SPIx, uint8_t SPI_CRC);
+uint16_t   SPI_GetCRCPolynomial(SPI_TypeDef *SPIx);
+void       SPI_BiDirectionalLineConfig(SPI_TypeDef *SPIx, uint16_t SPI_Direction);
+FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef *SPIx, uint16_t SPI_I2S_FLAG);
+void       SPI_I2S_ClearFlag(SPI_TypeDef *SPIx, uint16_t SPI_I2S_FLAG);
+ITStatus   SPI_I2S_GetITStatus(SPI_TypeDef *SPIx, uint8_t SPI_I2S_IT);
+void       SPI_I2S_ClearITPendingBit(SPI_TypeDef *SPIx, uint8_t SPI_I2S_IT);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_tim.h

@@ -0,0 +1,508 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_tim.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      TIM firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_TIM_H
+#define __CH32V20x_TIM_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* TIM Time Base Init structure definition */
+typedef struct
+{
+    uint16_t TIM_Prescaler; /* Specifies the prescaler value used to divide the TIM clock.
+                               This parameter can be a number between 0x0000 and 0xFFFF */
+
+    uint16_t TIM_CounterMode; /* Specifies the counter mode.
+                                 This parameter can be a value of @ref TIM_Counter_Mode */
+
+    uint16_t TIM_Period; /* Specifies the period value to be loaded into the active
+                            Auto-Reload Register at the next update event.
+                            This parameter must be a number between 0x0000 and 0xFFFF.  */
+
+    uint16_t TIM_ClockDivision; /* Specifies the clock division.
+                                  This parameter can be a value of @ref TIM_Clock_Division_CKD */
+
+    uint8_t TIM_RepetitionCounter; /* Specifies the repetition counter value. Each time the RCR downcounter
+                                      reaches zero, an update event is generated and counting restarts
+                                      from the RCR value (N).
+                                      This means in PWM mode that (N+1) corresponds to:
+                                         - the number of PWM periods in edge-aligned mode
+                                         - the number of half PWM period in center-aligned mode
+                                      This parameter must be a number between 0x00 and 0xFF.
+                                      @note This parameter is valid only for TIM1 and TIM8. */
+} TIM_TimeBaseInitTypeDef;
+
+/* TIM Output Compare Init structure definition */
+typedef struct
+{
+    uint16_t TIM_OCMode; /* Specifies the TIM mode.
+                            This parameter can be a value of @ref TIM_Output_Compare_and_PWM_modes */
+
+    uint16_t TIM_OutputState; /* Specifies the TIM Output Compare state.
+                                 This parameter can be a value of @ref TIM_Output_Compare_state */
+
+    uint16_t TIM_OutputNState; /* Specifies the TIM complementary Output Compare state.
+                                  This parameter can be a value of @ref TIM_Output_Compare_N_state
+                                  @note This parameter is valid only for TIM1 and TIM8. */
+
+    uint16_t TIM_Pulse; /* Specifies the pulse value to be loaded into the Capture Compare Register.
+                           This parameter can be a number between 0x0000 and 0xFFFF */
+
+    uint16_t TIM_OCPolarity; /* Specifies the output polarity.
+                                This parameter can be a value of @ref TIM_Output_Compare_Polarity */
+
+    uint16_t TIM_OCNPolarity; /* Specifies the complementary output polarity.
+                                 This parameter can be a value of @ref TIM_Output_Compare_N_Polarity
+                                 @note This parameter is valid only for TIM1 and TIM8. */
+
+    uint16_t TIM_OCIdleState; /* Specifies the TIM Output Compare pin state during Idle state.
+                                 This parameter can be a value of @ref TIM_Output_Compare_Idle_State
+                                 @note This parameter is valid only for TIM1 and TIM8. */
+
+    uint16_t TIM_OCNIdleState; /* Specifies the TIM Output Compare pin state during Idle state.
+                                  This parameter can be a value of @ref TIM_Output_Compare_N_Idle_State
+                                  @note This parameter is valid only for TIM1 and TIM8. */
+} TIM_OCInitTypeDef;
+
+/* TIM Input Capture Init structure definition */
+typedef struct
+{
+    uint16_t TIM_Channel; /* Specifies the TIM channel.
+                             This parameter can be a value of @ref TIM_Channel */
+
+    uint16_t TIM_ICPolarity; /* Specifies the active edge of the input signal.
+                                This parameter can be a value of @ref TIM_Input_Capture_Polarity */
+
+    uint16_t TIM_ICSelection; /* Specifies the input.
+                                 This parameter can be a value of @ref TIM_Input_Capture_Selection */
+
+    uint16_t TIM_ICPrescaler; /* Specifies the Input Capture Prescaler.
+                                 This parameter can be a value of @ref TIM_Input_Capture_Prescaler */
+
+    uint16_t TIM_ICFilter; /* Specifies the input capture filter.
+                              This parameter can be a number between 0x0 and 0xF */
+} TIM_ICInitTypeDef;
+
+/* BDTR structure definition */
+typedef struct
+{
+    uint16_t TIM_OSSRState; /* Specifies the Off-State selection used in Run mode.
+                               This parameter can be a value of @ref OSSR_Off_State_Selection_for_Run_mode_state */
+
+    uint16_t TIM_OSSIState; /* Specifies the Off-State used in Idle state.
+                               This parameter can be a value of @ref OSSI_Off_State_Selection_for_Idle_mode_state */
+
+    uint16_t TIM_LOCKLevel; /* Specifies the LOCK level parameters.
+                               This parameter can be a value of @ref Lock_level */
+
+    uint16_t TIM_DeadTime; /* Specifies the delay time between the switching-off and the
+                              switching-on of the outputs.
+                              This parameter can be a number between 0x00 and 0xFF  */
+
+    uint16_t TIM_Break; /* Specifies whether the TIM Break input is enabled or not.
+                           This parameter can be a value of @ref Break_Input_enable_disable */
+
+    uint16_t TIM_BreakPolarity; /* Specifies the TIM Break Input pin polarity.
+                                   This parameter can be a value of @ref Break_Polarity */
+
+    uint16_t TIM_AutomaticOutput; /* Specifies whether the TIM Automatic Output feature is enabled or not.
+                                     This parameter can be a value of @ref TIM_AOE_Bit_Set_Reset */
+} TIM_BDTRInitTypeDef;
+
+/* TIM_Output_Compare_and_PWM_modes */
+#define TIM_OCMode_Timing                  ((uint16_t)0x0000)
+#define TIM_OCMode_Active                  ((uint16_t)0x0010)
+#define TIM_OCMode_Inactive                ((uint16_t)0x0020)
+#define TIM_OCMode_Toggle                  ((uint16_t)0x0030)
+#define TIM_OCMode_PWM1                    ((uint16_t)0x0060)
+#define TIM_OCMode_PWM2                    ((uint16_t)0x0070)
+
+/* TIM_One_Pulse_Mode */
+#define TIM_OPMode_Single                  ((uint16_t)0x0008)
+#define TIM_OPMode_Repetitive              ((uint16_t)0x0000)
+
+/* TIM_Channel */
+#define TIM_Channel_1                      ((uint16_t)0x0000)
+#define TIM_Channel_2                      ((uint16_t)0x0004)
+#define TIM_Channel_3                      ((uint16_t)0x0008)
+#define TIM_Channel_4                      ((uint16_t)0x000C)
+
+/* TIM_Clock_Division_CKD */
+#define TIM_CKD_DIV1                       ((uint16_t)0x0000)
+#define TIM_CKD_DIV2                       ((uint16_t)0x0100)
+#define TIM_CKD_DIV4                       ((uint16_t)0x0200)
+
+/* TIM_Counter_Mode */
+#define TIM_CounterMode_Up                 ((uint16_t)0x0000)
+#define TIM_CounterMode_Down               ((uint16_t)0x0010)
+#define TIM_CounterMode_CenterAligned1     ((uint16_t)0x0020)
+#define TIM_CounterMode_CenterAligned2     ((uint16_t)0x0040)
+#define TIM_CounterMode_CenterAligned3     ((uint16_t)0x0060)
+
+/* TIM_Output_Compare_Polarity */
+#define TIM_OCPolarity_High                ((uint16_t)0x0000)
+#define TIM_OCPolarity_Low                 ((uint16_t)0x0002)
+
+/* TIM_Output_Compare_N_Polarity */
+#define TIM_OCNPolarity_High               ((uint16_t)0x0000)
+#define TIM_OCNPolarity_Low                ((uint16_t)0x0008)
+
+/* TIM_Output_Compare_state */
+#define TIM_OutputState_Disable            ((uint16_t)0x0000)
+#define TIM_OutputState_Enable             ((uint16_t)0x0001)
+
+/* TIM_Output_Compare_N_state */
+#define TIM_OutputNState_Disable           ((uint16_t)0x0000)
+#define TIM_OutputNState_Enable            ((uint16_t)0x0004)
+
+/* TIM_Capture_Compare_state */
+#define TIM_CCx_Enable                     ((uint16_t)0x0001)
+#define TIM_CCx_Disable                    ((uint16_t)0x0000)
+
+/* TIM_Capture_Compare_N_state */
+#define TIM_CCxN_Enable                    ((uint16_t)0x0004)
+#define TIM_CCxN_Disable                   ((uint16_t)0x0000)
+
+/* Break_Input_enable_disable */
+#define TIM_Break_Enable                   ((uint16_t)0x1000)
+#define TIM_Break_Disable                  ((uint16_t)0x0000)
+
+/* Break_Polarity */
+#define TIM_BreakPolarity_Low              ((uint16_t)0x0000)
+#define TIM_BreakPolarity_High             ((uint16_t)0x2000)
+
+/* TIM_AOE_Bit_Set_Reset */
+#define TIM_AutomaticOutput_Enable         ((uint16_t)0x4000)
+#define TIM_AutomaticOutput_Disable        ((uint16_t)0x0000)
+
+/* Lock_level */
+#define TIM_LOCKLevel_OFF                  ((uint16_t)0x0000)
+#define TIM_LOCKLevel_1                    ((uint16_t)0x0100)
+#define TIM_LOCKLevel_2                    ((uint16_t)0x0200)
+#define TIM_LOCKLevel_3                    ((uint16_t)0x0300)
+
+/* OSSI_Off_State_Selection_for_Idle_mode_state */
+#define TIM_OSSIState_Enable               ((uint16_t)0x0400)
+#define TIM_OSSIState_Disable              ((uint16_t)0x0000)
+
+/* OSSR_Off_State_Selection_for_Run_mode_state */
+#define TIM_OSSRState_Enable               ((uint16_t)0x0800)
+#define TIM_OSSRState_Disable              ((uint16_t)0x0000)
+
+/* TIM_Output_Compare_Idle_State */
+#define TIM_OCIdleState_Set                ((uint16_t)0x0100)
+#define TIM_OCIdleState_Reset              ((uint16_t)0x0000)
+
+/* TIM_Output_Compare_N_Idle_State */
+#define TIM_OCNIdleState_Set               ((uint16_t)0x0200)
+#define TIM_OCNIdleState_Reset             ((uint16_t)0x0000)
+
+/* TIM_Input_Capture_Polarity */
+#define TIM_ICPolarity_Rising              ((uint16_t)0x0000)
+#define TIM_ICPolarity_Falling             ((uint16_t)0x0002)
+#define TIM_ICPolarity_BothEdge            ((uint16_t)0x000A)
+
+/* TIM_Input_Capture_Selection */
+#define TIM_ICSelection_DirectTI           ((uint16_t)0x0001) /* TIM Input 1, 2, 3 or 4 is selected to be \
+                                                                 connected to IC1, IC2, IC3 or IC4, respectively */
+#define TIM_ICSelection_IndirectTI         ((uint16_t)0x0002) /* TIM Input 1, 2, 3 or 4 is selected to be \
+                                                                 connected to IC2, IC1, IC4 or IC3, respectively. */
+#define TIM_ICSelection_TRC                ((uint16_t)0x0003) /* TIM Input 1, 2, 3 or 4 is selected to be connected to TRC. */
+
+/* TIM_Input_Capture_Prescaler */
+#define TIM_ICPSC_DIV1                     ((uint16_t)0x0000) /* Capture performed each time an edge is detected on the capture input. */
+#define TIM_ICPSC_DIV2                     ((uint16_t)0x0004) /* Capture performed once every 2 events. */
+#define TIM_ICPSC_DIV4                     ((uint16_t)0x0008) /* Capture performed once every 4 events. */
+#define TIM_ICPSC_DIV8                     ((uint16_t)0x000C) /* Capture performed once every 8 events. */
+
+/* TIM_interrupt_sources */
+#define TIM_IT_Update                      ((uint16_t)0x0001)
+#define TIM_IT_CC1                         ((uint16_t)0x0002)
+#define TIM_IT_CC2                         ((uint16_t)0x0004)
+#define TIM_IT_CC3                         ((uint16_t)0x0008)
+#define TIM_IT_CC4                         ((uint16_t)0x0010)
+#define TIM_IT_COM                         ((uint16_t)0x0020)
+#define TIM_IT_Trigger                     ((uint16_t)0x0040)
+#define TIM_IT_Break                       ((uint16_t)0x0080)
+
+/* TIM_DMA_Base_address */
+#define TIM_DMABase_CR1                    ((uint16_t)0x0000)
+#define TIM_DMABase_CR2                    ((uint16_t)0x0001)
+#define TIM_DMABase_SMCR                   ((uint16_t)0x0002)
+#define TIM_DMABase_DIER                   ((uint16_t)0x0003)
+#define TIM_DMABase_SR                     ((uint16_t)0x0004)
+#define TIM_DMABase_EGR                    ((uint16_t)0x0005)
+#define TIM_DMABase_CCMR1                  ((uint16_t)0x0006)
+#define TIM_DMABase_CCMR2                  ((uint16_t)0x0007)
+#define TIM_DMABase_CCER                   ((uint16_t)0x0008)
+#define TIM_DMABase_CNT                    ((uint16_t)0x0009)
+#define TIM_DMABase_PSC                    ((uint16_t)0x000A)
+#define TIM_DMABase_ARR                    ((uint16_t)0x000B)
+#define TIM_DMABase_RCR                    ((uint16_t)0x000C)
+#define TIM_DMABase_CCR1                   ((uint16_t)0x000D)
+#define TIM_DMABase_CCR2                   ((uint16_t)0x000E)
+#define TIM_DMABase_CCR3                   ((uint16_t)0x000F)
+#define TIM_DMABase_CCR4                   ((uint16_t)0x0010)
+#define TIM_DMABase_BDTR                   ((uint16_t)0x0011)
+#define TIM_DMABase_DCR                    ((uint16_t)0x0012)
+
+/* TIM_DMA_Burst_Length */
+#define TIM_DMABurstLength_1Transfer       ((uint16_t)0x0000)
+#define TIM_DMABurstLength_2Transfers      ((uint16_t)0x0100)
+#define TIM_DMABurstLength_3Transfers      ((uint16_t)0x0200)
+#define TIM_DMABurstLength_4Transfers      ((uint16_t)0x0300)
+#define TIM_DMABurstLength_5Transfers      ((uint16_t)0x0400)
+#define TIM_DMABurstLength_6Transfers      ((uint16_t)0x0500)
+#define TIM_DMABurstLength_7Transfers      ((uint16_t)0x0600)
+#define TIM_DMABurstLength_8Transfers      ((uint16_t)0x0700)
+#define TIM_DMABurstLength_9Transfers      ((uint16_t)0x0800)
+#define TIM_DMABurstLength_10Transfers     ((uint16_t)0x0900)
+#define TIM_DMABurstLength_11Transfers     ((uint16_t)0x0A00)
+#define TIM_DMABurstLength_12Transfers     ((uint16_t)0x0B00)
+#define TIM_DMABurstLength_13Transfers     ((uint16_t)0x0C00)
+#define TIM_DMABurstLength_14Transfers     ((uint16_t)0x0D00)
+#define TIM_DMABurstLength_15Transfers     ((uint16_t)0x0E00)
+#define TIM_DMABurstLength_16Transfers     ((uint16_t)0x0F00)
+#define TIM_DMABurstLength_17Transfers     ((uint16_t)0x1000)
+#define TIM_DMABurstLength_18Transfers     ((uint16_t)0x1100)
+
+/* TIM_DMA_sources */
+#define TIM_DMA_Update                     ((uint16_t)0x0100)
+#define TIM_DMA_CC1                        ((uint16_t)0x0200)
+#define TIM_DMA_CC2                        ((uint16_t)0x0400)
+#define TIM_DMA_CC3                        ((uint16_t)0x0800)
+#define TIM_DMA_CC4                        ((uint16_t)0x1000)
+#define TIM_DMA_COM                        ((uint16_t)0x2000)
+#define TIM_DMA_Trigger                    ((uint16_t)0x4000)
+
+/* TIM_External_Trigger_Prescaler */
+#define TIM_ExtTRGPSC_OFF                  ((uint16_t)0x0000)
+#define TIM_ExtTRGPSC_DIV2                 ((uint16_t)0x1000)
+#define TIM_ExtTRGPSC_DIV4                 ((uint16_t)0x2000)
+#define TIM_ExtTRGPSC_DIV8                 ((uint16_t)0x3000)
+
+/* TIM_Internal_Trigger_Selection */
+#define TIM_TS_ITR0                        ((uint16_t)0x0000)
+#define TIM_TS_ITR1                        ((uint16_t)0x0010)
+#define TIM_TS_ITR2                        ((uint16_t)0x0020)
+#define TIM_TS_ITR3                        ((uint16_t)0x0030)
+#define TIM_TS_TI1F_ED                     ((uint16_t)0x0040)
+#define TIM_TS_TI1FP1                      ((uint16_t)0x0050)
+#define TIM_TS_TI2FP2                      ((uint16_t)0x0060)
+#define TIM_TS_ETRF                        ((uint16_t)0x0070)
+
+/* TIM_TIx_External_Clock_Source */
+#define TIM_TIxExternalCLK1Source_TI1      ((uint16_t)0x0050)
+#define TIM_TIxExternalCLK1Source_TI2      ((uint16_t)0x0060)
+#define TIM_TIxExternalCLK1Source_TI1ED    ((uint16_t)0x0040)
+
+/* TIM_External_Trigger_Polarity */
+#define TIM_ExtTRGPolarity_Inverted        ((uint16_t)0x8000)
+#define TIM_ExtTRGPolarity_NonInverted     ((uint16_t)0x0000)
+
+/* TIM_Prescaler_Reload_Mode */
+#define TIM_PSCReloadMode_Update           ((uint16_t)0x0000)
+#define TIM_PSCReloadMode_Immediate        ((uint16_t)0x0001)
+
+/* TIM_Forced_Action */
+#define TIM_ForcedAction_Active            ((uint16_t)0x0050)
+#define TIM_ForcedAction_InActive          ((uint16_t)0x0040)
+
+/* TIM_Encoder_Mode */
+#define TIM_EncoderMode_TI1                ((uint16_t)0x0001)
+#define TIM_EncoderMode_TI2                ((uint16_t)0x0002)
+#define TIM_EncoderMode_TI12               ((uint16_t)0x0003)
+
+/* TIM_Event_Source */
+#define TIM_EventSource_Update             ((uint16_t)0x0001)
+#define TIM_EventSource_CC1                ((uint16_t)0x0002)
+#define TIM_EventSource_CC2                ((uint16_t)0x0004)
+#define TIM_EventSource_CC3                ((uint16_t)0x0008)
+#define TIM_EventSource_CC4                ((uint16_t)0x0010)
+#define TIM_EventSource_COM                ((uint16_t)0x0020)
+#define TIM_EventSource_Trigger            ((uint16_t)0x0040)
+#define TIM_EventSource_Break              ((uint16_t)0x0080)
+
+/* TIM_Update_Source */
+#define TIM_UpdateSource_Global            ((uint16_t)0x0000) /* Source of update is the counter overflow/underflow \
+                                                                 or the setting of UG bit, or an update generation  \
+                                                                 through the slave mode controller. */
+#define TIM_UpdateSource_Regular           ((uint16_t)0x0001) /* Source of update is counter overflow/underflow. */
+
+/* TIM_Output_Compare_Preload_State */
+#define TIM_OCPreload_Enable               ((uint16_t)0x0008)
+#define TIM_OCPreload_Disable              ((uint16_t)0x0000)
+
+/* TIM_Output_Compare_Fast_State */
+#define TIM_OCFast_Enable                  ((uint16_t)0x0004)
+#define TIM_OCFast_Disable                 ((uint16_t)0x0000)
+
+/* TIM_Output_Compare_Clear_State */
+#define TIM_OCClear_Enable                 ((uint16_t)0x0080)
+#define TIM_OCClear_Disable                ((uint16_t)0x0000)
+
+/* TIM_Trigger_Output_Source */
+#define TIM_TRGOSource_Reset               ((uint16_t)0x0000)
+#define TIM_TRGOSource_Enable              ((uint16_t)0x0010)
+#define TIM_TRGOSource_Update              ((uint16_t)0x0020)
+#define TIM_TRGOSource_OC1                 ((uint16_t)0x0030)
+#define TIM_TRGOSource_OC1Ref              ((uint16_t)0x0040)
+#define TIM_TRGOSource_OC2Ref              ((uint16_t)0x0050)
+#define TIM_TRGOSource_OC3Ref              ((uint16_t)0x0060)
+#define TIM_TRGOSource_OC4Ref              ((uint16_t)0x0070)
+
+/* TIM_Slave_Mode */
+#define TIM_SlaveMode_Reset                ((uint16_t)0x0004)
+#define TIM_SlaveMode_Gated                ((uint16_t)0x0005)
+#define TIM_SlaveMode_Trigger              ((uint16_t)0x0006)
+#define TIM_SlaveMode_External1            ((uint16_t)0x0007)
+
+/* TIM_Master_Slave_Mode */
+#define TIM_MasterSlaveMode_Enable         ((uint16_t)0x0080)
+#define TIM_MasterSlaveMode_Disable        ((uint16_t)0x0000)
+
+/* TIM_Flags */
+#define TIM_FLAG_Update                    ((uint16_t)0x0001)
+#define TIM_FLAG_CC1                       ((uint16_t)0x0002)
+#define TIM_FLAG_CC2                       ((uint16_t)0x0004)
+#define TIM_FLAG_CC3                       ((uint16_t)0x0008)
+#define TIM_FLAG_CC4                       ((uint16_t)0x0010)
+#define TIM_FLAG_COM                       ((uint16_t)0x0020)
+#define TIM_FLAG_Trigger                   ((uint16_t)0x0040)
+#define TIM_FLAG_Break                     ((uint16_t)0x0080)
+#define TIM_FLAG_CC1OF                     ((uint16_t)0x0200)
+#define TIM_FLAG_CC2OF                     ((uint16_t)0x0400)
+#define TIM_FLAG_CC3OF                     ((uint16_t)0x0800)
+#define TIM_FLAG_CC4OF                     ((uint16_t)0x1000)
+
+/* TIM_Legacy */
+#define TIM_DMABurstLength_1Byte           TIM_DMABurstLength_1Transfer
+#define TIM_DMABurstLength_2Bytes          TIM_DMABurstLength_2Transfers
+#define TIM_DMABurstLength_3Bytes          TIM_DMABurstLength_3Transfers
+#define TIM_DMABurstLength_4Bytes          TIM_DMABurstLength_4Transfers
+#define TIM_DMABurstLength_5Bytes          TIM_DMABurstLength_5Transfers
+#define TIM_DMABurstLength_6Bytes          TIM_DMABurstLength_6Transfers
+#define TIM_DMABurstLength_7Bytes          TIM_DMABurstLength_7Transfers
+#define TIM_DMABurstLength_8Bytes          TIM_DMABurstLength_8Transfers
+#define TIM_DMABurstLength_9Bytes          TIM_DMABurstLength_9Transfers
+#define TIM_DMABurstLength_10Bytes         TIM_DMABurstLength_10Transfers
+#define TIM_DMABurstLength_11Bytes         TIM_DMABurstLength_11Transfers
+#define TIM_DMABurstLength_12Bytes         TIM_DMABurstLength_12Transfers
+#define TIM_DMABurstLength_13Bytes         TIM_DMABurstLength_13Transfers
+#define TIM_DMABurstLength_14Bytes         TIM_DMABurstLength_14Transfers
+#define TIM_DMABurstLength_15Bytes         TIM_DMABurstLength_15Transfers
+#define TIM_DMABurstLength_16Bytes         TIM_DMABurstLength_16Transfers
+#define TIM_DMABurstLength_17Bytes         TIM_DMABurstLength_17Transfers
+#define TIM_DMABurstLength_18Bytes         TIM_DMABurstLength_18Transfers
+
+void       TIM_DeInit(TIM_TypeDef *TIMx);
+void       TIM_TimeBaseInit(TIM_TypeDef *TIMx, TIM_TimeBaseInitTypeDef *TIM_TimeBaseInitStruct);
+void       TIM_OC1Init(TIM_TypeDef *TIMx, TIM_OCInitTypeDef *TIM_OCInitStruct);
+void       TIM_OC2Init(TIM_TypeDef *TIMx, TIM_OCInitTypeDef *TIM_OCInitStruct);
+void       TIM_OC3Init(TIM_TypeDef *TIMx, TIM_OCInitTypeDef *TIM_OCInitStruct);
+void       TIM_OC4Init(TIM_TypeDef *TIMx, TIM_OCInitTypeDef *TIM_OCInitStruct);
+void       TIM_ICInit(TIM_TypeDef *TIMx, TIM_ICInitTypeDef *TIM_ICInitStruct);
+void       TIM_PWMIConfig(TIM_TypeDef *TIMx, TIM_ICInitTypeDef *TIM_ICInitStruct);
+void       TIM_BDTRConfig(TIM_TypeDef *TIMx, TIM_BDTRInitTypeDef *TIM_BDTRInitStruct);
+void       TIM_TimeBaseStructInit(TIM_TimeBaseInitTypeDef *TIM_TimeBaseInitStruct);
+void       TIM_OCStructInit(TIM_OCInitTypeDef *TIM_OCInitStruct);
+void       TIM_ICStructInit(TIM_ICInitTypeDef *TIM_ICInitStruct);
+void       TIM_BDTRStructInit(TIM_BDTRInitTypeDef *TIM_BDTRInitStruct);
+void       TIM_Cmd(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_CtrlPWMOutputs(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_ITConfig(TIM_TypeDef *TIMx, uint16_t TIM_IT, FunctionalState NewState);
+void       TIM_GenerateEvent(TIM_TypeDef *TIMx, uint16_t TIM_EventSource);
+void       TIM_DMAConfig(TIM_TypeDef *TIMx, uint16_t TIM_DMABase, uint16_t TIM_DMABurstLength);
+void       TIM_DMACmd(TIM_TypeDef *TIMx, uint16_t TIM_DMASource, FunctionalState NewState);
+void       TIM_InternalClockConfig(TIM_TypeDef *TIMx);
+void       TIM_ITRxExternalClockConfig(TIM_TypeDef *TIMx, uint16_t TIM_InputTriggerSource);
+void       TIM_TIxExternalClockConfig(TIM_TypeDef *TIMx, uint16_t TIM_TIxExternalCLKSource,
+                                      uint16_t TIM_ICPolarity, uint16_t ICFilter);
+void       TIM_ETRClockMode1Config(TIM_TypeDef *TIMx, uint16_t TIM_ExtTRGPrescaler, uint16_t TIM_ExtTRGPolarity,
+                                   uint16_t ExtTRGFilter);
+void       TIM_ETRClockMode2Config(TIM_TypeDef *TIMx, uint16_t TIM_ExtTRGPrescaler,
+                                   uint16_t TIM_ExtTRGPolarity, uint16_t ExtTRGFilter);
+void       TIM_ETRConfig(TIM_TypeDef *TIMx, uint16_t TIM_ExtTRGPrescaler, uint16_t TIM_ExtTRGPolarity,
+                         uint16_t ExtTRGFilter);
+void       TIM_PrescalerConfig(TIM_TypeDef *TIMx, uint16_t Prescaler, uint16_t TIM_PSCReloadMode);
+void       TIM_CounterModeConfig(TIM_TypeDef *TIMx, uint16_t TIM_CounterMode);
+void       TIM_SelectInputTrigger(TIM_TypeDef *TIMx, uint16_t TIM_InputTriggerSource);
+void       TIM_EncoderInterfaceConfig(TIM_TypeDef *TIMx, uint16_t TIM_EncoderMode,
+                                      uint16_t TIM_IC1Polarity, uint16_t TIM_IC2Polarity);
+void       TIM_ForcedOC1Config(TIM_TypeDef *TIMx, uint16_t TIM_ForcedAction);
+void       TIM_ForcedOC2Config(TIM_TypeDef *TIMx, uint16_t TIM_ForcedAction);
+void       TIM_ForcedOC3Config(TIM_TypeDef *TIMx, uint16_t TIM_ForcedAction);
+void       TIM_ForcedOC4Config(TIM_TypeDef *TIMx, uint16_t TIM_ForcedAction);
+void       TIM_ARRPreloadConfig(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_SelectCOM(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_SelectCCDMA(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_CCPreloadControl(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_OC1PreloadConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPreload);
+void       TIM_OC2PreloadConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPreload);
+void       TIM_OC3PreloadConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPreload);
+void       TIM_OC4PreloadConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPreload);
+void       TIM_OC1FastConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCFast);
+void       TIM_OC2FastConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCFast);
+void       TIM_OC3FastConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCFast);
+void       TIM_OC4FastConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCFast);
+void       TIM_ClearOC1Ref(TIM_TypeDef *TIMx, uint16_t TIM_OCClear);
+void       TIM_ClearOC2Ref(TIM_TypeDef *TIMx, uint16_t TIM_OCClear);
+void       TIM_ClearOC3Ref(TIM_TypeDef *TIMx, uint16_t TIM_OCClear);
+void       TIM_ClearOC4Ref(TIM_TypeDef *TIMx, uint16_t TIM_OCClear);
+void       TIM_OC1PolarityConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPolarity);
+void       TIM_OC1NPolarityConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCNPolarity);
+void       TIM_OC2PolarityConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPolarity);
+void       TIM_OC2NPolarityConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCNPolarity);
+void       TIM_OC3PolarityConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPolarity);
+void       TIM_OC3NPolarityConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCNPolarity);
+void       TIM_OC4PolarityConfig(TIM_TypeDef *TIMx, uint16_t TIM_OCPolarity);
+void       TIM_CCxCmd(TIM_TypeDef *TIMx, uint16_t TIM_Channel, uint16_t TIM_CCx);
+void       TIM_CCxNCmd(TIM_TypeDef *TIMx, uint16_t TIM_Channel, uint16_t TIM_CCxN);
+void       TIM_SelectOCxM(TIM_TypeDef *TIMx, uint16_t TIM_Channel, uint16_t TIM_OCMode);
+void       TIM_UpdateDisableConfig(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_UpdateRequestConfig(TIM_TypeDef *TIMx, uint16_t TIM_UpdateSource);
+void       TIM_SelectHallSensor(TIM_TypeDef *TIMx, FunctionalState NewState);
+void       TIM_SelectOnePulseMode(TIM_TypeDef *TIMx, uint16_t TIM_OPMode);
+void       TIM_SelectOutputTrigger(TIM_TypeDef *TIMx, uint16_t TIM_TRGOSource);
+void       TIM_SelectSlaveMode(TIM_TypeDef *TIMx, uint16_t TIM_SlaveMode);
+void       TIM_SelectMasterSlaveMode(TIM_TypeDef *TIMx, uint16_t TIM_MasterSlaveMode);
+void       TIM_SetCounter(TIM_TypeDef *TIMx, uint16_t Counter);
+void       TIM_SetAutoreload(TIM_TypeDef *TIMx, uint16_t Autoreload);
+void       TIM_SetCompare1(TIM_TypeDef *TIMx, uint16_t Compare1);
+void       TIM_SetCompare2(TIM_TypeDef *TIMx, uint16_t Compare2);
+void       TIM_SetCompare3(TIM_TypeDef *TIMx, uint16_t Compare3);
+void       TIM_SetCompare4(TIM_TypeDef *TIMx, uint16_t Compare4);
+void       TIM_SetIC1Prescaler(TIM_TypeDef *TIMx, uint16_t TIM_ICPSC);
+void       TIM_SetIC2Prescaler(TIM_TypeDef *TIMx, uint16_t TIM_ICPSC);
+void       TIM_SetIC3Prescaler(TIM_TypeDef *TIMx, uint16_t TIM_ICPSC);
+void       TIM_SetIC4Prescaler(TIM_TypeDef *TIMx, uint16_t TIM_ICPSC);
+void       TIM_SetClockDivision(TIM_TypeDef *TIMx, uint16_t TIM_CKD);
+uint16_t   TIM_GetCapture1(TIM_TypeDef *TIMx);
+uint16_t   TIM_GetCapture2(TIM_TypeDef *TIMx);
+uint16_t   TIM_GetCapture3(TIM_TypeDef *TIMx);
+uint16_t   TIM_GetCapture4(TIM_TypeDef *TIMx);
+uint16_t   TIM_GetCounter(TIM_TypeDef *TIMx);
+uint16_t   TIM_GetPrescaler(TIM_TypeDef *TIMx);
+FlagStatus TIM_GetFlagStatus(TIM_TypeDef *TIMx, uint16_t TIM_FLAG);
+void       TIM_ClearFlag(TIM_TypeDef *TIMx, uint16_t TIM_FLAG);
+ITStatus   TIM_GetITStatus(TIM_TypeDef *TIMx, uint16_t TIM_IT);
+void       TIM_ClearITPendingBit(TIM_TypeDef *TIMx, uint16_t TIM_IT);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_usart.h

@@ -0,0 +1,185 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_usart.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/01/06
+ * Description        : This file contains all the functions prototypes for the
+ *                      USART firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_USART_H
+#define __CH32V20x_USART_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* USART Init Structure definition */
+typedef struct
+{
+    uint32_t USART_BaudRate; /* This member configures the USART communication baud rate.
+                                The baud rate is computed using the following formula:
+                                 - IntegerDivider = ((PCLKx) / (16 * (USART_InitStruct->USART_BaudRate)))
+                                 - FractionalDivider = ((IntegerDivider - ((u32) IntegerDivider)) * 16) + 0.5 */
+
+    uint16_t USART_WordLength; /* Specifies the number of data bits transmitted or received in a frame.
+                                  This parameter can be a value of @ref USART_Word_Length */
+
+    uint16_t USART_StopBits; /* Specifies the number of stop bits transmitted.
+                                This parameter can be a value of @ref USART_Stop_Bits */
+
+    uint16_t USART_Parity; /* Specifies the parity mode.
+                              This parameter can be a value of @ref USART_Parity
+                              @note When parity is enabled, the computed parity is inserted
+                                    at the MSB position of the transmitted data (9th bit when
+                                    the word length is set to 9 data bits; 8th bit when the
+                                    word length is set to 8 data bits). */
+
+    uint16_t USART_Mode; /* Specifies wether the Receive or Transmit mode is enabled or disabled.
+                            This parameter can be a value of @ref USART_Mode */
+
+    uint16_t USART_HardwareFlowControl; /* Specifies wether the hardware flow control mode is enabled
+                                           or disabled.
+                                           This parameter can be a value of @ref USART_Hardware_Flow_Control */
+} USART_InitTypeDef;
+
+/* USART Clock Init Structure definition */
+typedef struct
+{
+    uint16_t USART_Clock; /* Specifies whether the USART clock is enabled or disabled.
+                             This parameter can be a value of @ref USART_Clock */
+
+    uint16_t USART_CPOL; /* Specifies the steady state value of the serial clock.
+                            This parameter can be a value of @ref USART_Clock_Polarity */
+
+    uint16_t USART_CPHA; /* Specifies the clock transition on which the bit capture is made.
+                            This parameter can be a value of @ref USART_Clock_Phase */
+
+    uint16_t USART_LastBit; /* Specifies whether the clock pulse corresponding to the last transmitted
+                               data bit (MSB) has to be output on the SCLK pin in synchronous mode.
+                               This parameter can be a value of @ref USART_Last_Bit */
+} USART_ClockInitTypeDef;
+
+/* USART_Word_Length */
+#define USART_WordLength_8b                  ((uint16_t)0x0000)
+#define USART_WordLength_9b                  ((uint16_t)0x1000)
+
+/* USART_Stop_Bits */
+#define USART_StopBits_1                     ((uint16_t)0x0000)
+#define USART_StopBits_0_5                   ((uint16_t)0x1000)
+#define USART_StopBits_2                     ((uint16_t)0x2000)
+#define USART_StopBits_1_5                   ((uint16_t)0x3000)
+
+/* USART_Parity */
+#define USART_Parity_No                      ((uint16_t)0x0000)
+#define USART_Parity_Even                    ((uint16_t)0x0400)
+#define USART_Parity_Odd                     ((uint16_t)0x0600)
+
+/* USART_Mode */
+#define USART_Mode_Rx                        ((uint16_t)0x0004)
+#define USART_Mode_Tx                        ((uint16_t)0x0008)
+
+/* USART_Hardware_Flow_Control */
+#define USART_HardwareFlowControl_None       ((uint16_t)0x0000)
+#define USART_HardwareFlowControl_RTS        ((uint16_t)0x0100)
+#define USART_HardwareFlowControl_CTS        ((uint16_t)0x0200)
+#define USART_HardwareFlowControl_RTS_CTS    ((uint16_t)0x0300)
+
+/* USART_Clock */
+#define USART_Clock_Disable                  ((uint16_t)0x0000)
+#define USART_Clock_Enable                   ((uint16_t)0x0800)
+
+/* USART_Clock_Polarity */
+#define USART_CPOL_Low                       ((uint16_t)0x0000)
+#define USART_CPOL_High                      ((uint16_t)0x0400)
+
+/* USART_Clock_Phase */
+#define USART_CPHA_1Edge                     ((uint16_t)0x0000)
+#define USART_CPHA_2Edge                     ((uint16_t)0x0200)
+
+/* USART_Last_Bit */
+#define USART_LastBit_Disable                ((uint16_t)0x0000)
+#define USART_LastBit_Enable                 ((uint16_t)0x0100)
+
+/* USART_Interrupt_definition */
+#define USART_IT_PE                          ((uint16_t)0x0028)
+#define USART_IT_TXE                         ((uint16_t)0x0727)
+#define USART_IT_TC                          ((uint16_t)0x0626)
+#define USART_IT_RXNE                        ((uint16_t)0x0525)
+#define USART_IT_ORE_RX                      ((uint16_t)0x0325)
+#define USART_IT_IDLE                        ((uint16_t)0x0424)
+#define USART_IT_LBD                         ((uint16_t)0x0846)
+#define USART_IT_CTS                         ((uint16_t)0x096A)
+#define USART_IT_ERR                         ((uint16_t)0x0060)
+#define USART_IT_ORE_ER                      ((uint16_t)0x0360)
+#define USART_IT_NE                          ((uint16_t)0x0260)
+#define USART_IT_FE                          ((uint16_t)0x0160)
+
+#define USART_IT_ORE                         USART_IT_ORE_ER
+
+/* USART_DMA_Requests */
+#define USART_DMAReq_Tx                      ((uint16_t)0x0080)
+#define USART_DMAReq_Rx                      ((uint16_t)0x0040)
+
+/* USART_WakeUp_methods */
+#define USART_WakeUp_IdleLine                ((uint16_t)0x0000)
+#define USART_WakeUp_AddressMark             ((uint16_t)0x0800)
+
+/* USART_LIN_Break_Detection_Length */
+#define USART_LINBreakDetectLength_10b       ((uint16_t)0x0000)
+#define USART_LINBreakDetectLength_11b       ((uint16_t)0x0020)
+
+/* USART_IrDA_Low_Power */
+#define USART_IrDAMode_LowPower              ((uint16_t)0x0004)
+#define USART_IrDAMode_Normal                ((uint16_t)0x0000)
+
+/* USART_Flags */
+#define USART_FLAG_CTS                       ((uint16_t)0x0200)
+#define USART_FLAG_LBD                       ((uint16_t)0x0100)
+#define USART_FLAG_TXE                       ((uint16_t)0x0080)
+#define USART_FLAG_TC                        ((uint16_t)0x0040)
+#define USART_FLAG_RXNE                      ((uint16_t)0x0020)
+#define USART_FLAG_IDLE                      ((uint16_t)0x0010)
+#define USART_FLAG_ORE                       ((uint16_t)0x0008)
+#define USART_FLAG_NE                        ((uint16_t)0x0004)
+#define USART_FLAG_FE                        ((uint16_t)0x0002)
+#define USART_FLAG_PE                        ((uint16_t)0x0001)
+
+void       USART_DeInit(USART_TypeDef *USARTx);
+void       USART_Init(USART_TypeDef *USARTx, USART_InitTypeDef *USART_InitStruct);
+void       USART_StructInit(USART_InitTypeDef *USART_InitStruct);
+void       USART_ClockInit(USART_TypeDef *USARTx, USART_ClockInitTypeDef *USART_ClockInitStruct);
+void       USART_ClockStructInit(USART_ClockInitTypeDef *USART_ClockInitStruct);
+void       USART_Cmd(USART_TypeDef *USARTx, FunctionalState NewState);
+void       USART_ITConfig(USART_TypeDef *USARTx, uint16_t USART_IT, FunctionalState NewState);
+void       USART_DMACmd(USART_TypeDef *USARTx, uint16_t USART_DMAReq, FunctionalState NewState);
+void       USART_SetAddress(USART_TypeDef *USARTx, uint8_t USART_Address);
+void       USART_WakeUpConfig(USART_TypeDef *USARTx, uint16_t USART_WakeUp);
+void       USART_ReceiverWakeUpCmd(USART_TypeDef *USARTx, FunctionalState NewState);
+void       USART_LINBreakDetectLengthConfig(USART_TypeDef *USARTx, uint16_t USART_LINBreakDetectLength);
+void       USART_LINCmd(USART_TypeDef *USARTx, FunctionalState NewState);
+void       USART_SendData(USART_TypeDef *USARTx, uint16_t Data);
+uint16_t   USART_ReceiveData(USART_TypeDef *USARTx);
+void       USART_SendBreak(USART_TypeDef *USARTx);
+void       USART_SetGuardTime(USART_TypeDef *USARTx, uint8_t USART_GuardTime);
+void       USART_SetPrescaler(USART_TypeDef *USARTx, uint8_t USART_Prescaler);
+void       USART_SmartCardCmd(USART_TypeDef *USARTx, FunctionalState NewState);
+void       USART_SmartCardNACKCmd(USART_TypeDef *USARTx, FunctionalState NewState);
+void       USART_HalfDuplexCmd(USART_TypeDef *USARTx, FunctionalState NewState);
+void       USART_IrDAConfig(USART_TypeDef *USARTx, uint16_t USART_IrDAMode);
+void       USART_IrDACmd(USART_TypeDef *USARTx, FunctionalState NewState);
+FlagStatus USART_GetFlagStatus(USART_TypeDef *USARTx, uint16_t USART_FLAG);
+void       USART_ClearFlag(USART_TypeDef *USARTx, uint16_t USART_FLAG);
+ITStatus   USART_GetITStatus(USART_TypeDef *USARTx, uint16_t USART_IT);
+void       USART_ClearITPendingBit(USART_TypeDef *USARTx, uint16_t USART_IT);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/inc/ch32v20x_usb.h

@@ -0,0 +1,532 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_usb.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/01/30
+ * Description        : This file contains all the functions prototypes for the USB
+ *                      firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20X_USB_H
+#define __CH32V20X_USB_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*******************************************************************************/
+/* Header File */
+#include "stdint.h"
+
+/*******************************************************************************/
+/* USB Communication Related Macro Definition */
+#ifndef DEFAULT_ENDP0_SIZE
+#define DEFAULT_ENDP0_SIZE          8          // default maximum packet size for endpoint 0
+#endif
+#ifndef MAX_PACKET_SIZE
+#define MAX_PACKET_SIZE             64         // maximum packet size
+#endif
+
+/* USB PID */
+#ifndef USB_PID_SETUP
+#define USB_PID_NULL                0x00
+#define USB_PID_SOF                 0x05
+#define USB_PID_SETUP               0x0D
+#define USB_PID_IN                  0x09
+#define USB_PID_OUT                 0x01
+#define USB_PID_NYET                0x06
+#define USB_PID_ACK                 0x02
+#define USB_PID_NAK                 0x0A
+#define USB_PID_STALL               0x0E
+#define USB_PID_DATA0               0x03
+#define USB_PID_DATA1               0x0B
+#define USB_PID_PRE                 0x0C
+#endif
+
+/* USB standard device request code */
+#ifndef USB_GET_DESCRIPTOR
+#define USB_GET_STATUS              0x00
+#define USB_CLEAR_FEATURE           0x01
+#define USB_SET_FEATURE             0x03
+#define USB_SET_ADDRESS             0x05
+#define USB_GET_DESCRIPTOR          0x06
+#define USB_SET_DESCRIPTOR          0x07
+#define USB_GET_CONFIGURATION       0x08
+#define USB_SET_CONFIGURATION       0x09
+#define USB_GET_INTERFACE           0x0A
+#define USB_SET_INTERFACE           0x0B
+#define USB_SYNCH_FRAME             0x0C
+#endif
+
+#define DEF_STRING_DESC_LANG        0x00
+#define DEF_STRING_DESC_MANU        0x01
+#define DEF_STRING_DESC_PROD        0x02
+#define DEF_STRING_DESC_SERN        0x03
+
+/* USB hub class request code */
+#ifndef HUB_GET_DESCRIPTOR
+#define HUB_GET_STATUS              0x00
+#define HUB_CLEAR_FEATURE           0x01
+#define HUB_GET_STATE               0x02
+#define HUB_SET_FEATURE             0x03
+#define HUB_GET_DESCRIPTOR          0x06
+#define HUB_SET_DESCRIPTOR          0x07
+#endif
+
+/* USB HID class request code */
+#ifndef HID_GET_REPORT
+#define HID_GET_REPORT              0x01
+#define HID_GET_IDLE                0x02
+#define HID_GET_PROTOCOL            0x03
+#define HID_SET_REPORT              0x09
+#define HID_SET_IDLE                0x0A
+#define HID_SET_PROTOCOL            0x0B
+#endif
+
+/* Bit Define for USB Request Type */
+#ifndef USB_REQ_TYP_MASK
+#define USB_REQ_TYP_IN              0x80
+#define USB_REQ_TYP_OUT             0x00
+#define USB_REQ_TYP_READ            0x80
+#define USB_REQ_TYP_WRITE           0x00
+#define USB_REQ_TYP_MASK            0x60
+#define USB_REQ_TYP_STANDARD        0x00
+#define USB_REQ_TYP_CLASS           0x20
+#define USB_REQ_TYP_VENDOR          0x40
+#define USB_REQ_TYP_RESERVED        0x60
+#define USB_REQ_RECIP_MASK          0x1F
+#define USB_REQ_RECIP_DEVICE        0x00
+#define USB_REQ_RECIP_INTERF        0x01
+#define USB_REQ_RECIP_ENDP          0x02
+#define USB_REQ_RECIP_OTHER         0x03
+#define USB_REQ_FEAT_REMOTE_WAKEUP  0x01
+#define USB_REQ_FEAT_ENDP_HALT      0x00
+#endif
+
+/* USB Descriptor Type */
+#ifndef USB_DESCR_TYP_DEVICE
+#define USB_DESCR_TYP_DEVICE        0x01
+#define USB_DESCR_TYP_CONFIG        0x02
+#define USB_DESCR_TYP_STRING        0x03
+#define USB_DESCR_TYP_INTERF        0x04
+#define USB_DESCR_TYP_ENDP          0x05
+#define USB_DESCR_TYP_QUALIF        0x06
+#define USB_DESCR_TYP_SPEED         0x07
+#define USB_DESCR_TYP_OTG           0x09
+#define USB_DESCR_TYP_BOS           0X0F
+#define USB_DESCR_TYP_HID           0x21
+#define USB_DESCR_TYP_REPORT        0x22
+#define USB_DESCR_TYP_PHYSIC        0x23
+#define USB_DESCR_TYP_CS_INTF       0x24
+#define USB_DESCR_TYP_CS_ENDP       0x25
+#define USB_DESCR_TYP_HUB           0x29
+#endif
+
+/* USB Device Class */
+#ifndef USB_DEV_CLASS_HUB
+#define USB_DEV_CLASS_RESERVED      0x00
+#define USB_DEV_CLASS_AUDIO         0x01
+#define USB_DEV_CLASS_COMMUNIC      0x02
+#define USB_DEV_CLASS_HID           0x03
+#define USB_DEV_CLASS_MONITOR       0x04
+#define USB_DEV_CLASS_PHYSIC_IF     0x05
+#define USB_DEV_CLASS_POWER         0x06
+#define USB_DEV_CLASS_IMAGE         0x06
+#define USB_DEV_CLASS_PRINTER       0x07
+#define USB_DEV_CLASS_STORAGE       0x08
+#define USB_DEV_CLASS_HUB           0x09
+#define USB_DEV_CLASS_VEN_SPEC      0xFF
+#endif
+
+/* USB Hub Class Request */
+#ifndef HUB_GET_HUB_DESCRIPTOR
+#define HUB_CLEAR_HUB_FEATURE       0x20
+#define HUB_CLEAR_PORT_FEATURE      0x23
+#define HUB_GET_BUS_STATE           0xA3
+#define HUB_GET_HUB_DESCRIPTOR      0xA0
+#define HUB_GET_HUB_STATUS          0xA0
+#define HUB_GET_PORT_STATUS         0xA3
+#define HUB_SET_HUB_DESCRIPTOR      0x20
+#define HUB_SET_HUB_FEATURE         0x20
+#define HUB_SET_PORT_FEATURE        0x23
+#endif
+
+/* Hub Class Feature Selectors */
+#ifndef HUB_PORT_RESET
+#define HUB_C_HUB_LOCAL_POWER       0
+#define HUB_C_HUB_OVER_CURRENT      1
+#define HUB_PORT_CONNECTION         0
+#define HUB_PORT_ENABLE             1
+#define HUB_PORT_SUSPEND            2
+#define HUB_PORT_OVER_CURRENT       3
+#define HUB_PORT_RESET              4
+#define HUB_PORT_POWER              8
+#define HUB_PORT_LOW_SPEED          9
+#define HUB_C_PORT_CONNECTION       16
+#define HUB_C_PORT_ENABLE           17
+#define HUB_C_PORT_SUSPEND          18
+#define HUB_C_PORT_OVER_CURRENT     19
+#define HUB_C_PORT_RESET            20
+#endif
+
+/* USB HID Class Request Code */
+#ifndef HID_GET_REPORT
+#define HID_GET_REPORT              0x01
+#define HID_GET_IDLE                0x02
+#define HID_GET_PROTOCOL            0x03
+#define HID_SET_REPORT              0x09
+#define HID_SET_IDLE                0x0A
+#define HID_SET_PROTOCOL            0x0B
+#endif
+
+/* USB CDC Class request code */
+#ifndef CDC_GET_LINE_CODING
+#define CDC_GET_LINE_CODING         0X21                                      /* This request allows the host to find out the currently configured line coding */
+#define CDC_SET_LINE_CODING         0x20                                      /* Configures DTE rate, stop-bits, parity, and number-of-character */
+#define CDC_SET_LINE_CTLSTE         0X22                                      /* This request generates RS-232/V.24 style control signals */
+#define CDC_SEND_BREAK              0X23                                      /* Sends special carrier modulation used to specify RS-232 style break */
+#endif
+
+/* USB UDisk */
+#ifndef USB_BO_CBW_SIZE
+#define USB_BO_CBW_SIZE             0x1F
+#define USB_BO_CSW_SIZE             0x0D
+#endif
+#ifndef USB_BO_CBW_SIG0
+#define USB_BO_CBW_SIG0             0x55
+#define USB_BO_CBW_SIG1             0x53
+#define USB_BO_CBW_SIG2             0x42
+#define USB_BO_CBW_SIG3             0x43
+#define USB_BO_CSW_SIG0             0x55
+#define USB_BO_CSW_SIG1             0x53
+#define USB_BO_CSW_SIG2             0x42
+#define USB_BO_CSW_SIG3             0x53
+#endif
+
+
+/*******************************************************************************/
+/* USBFS Related Register Macro Definition */
+
+/* R8_USB_CTRL */
+#define USBFS_UC_HOST_MODE          0x80
+#define USBFS_UC_LOW_SPEED          0x40
+#define USBFS_UC_DEV_PU_EN          0x20
+#define USBFS_UC_SYS_CTRL_MASK      0x30
+#define USBFS_UC_SYS_CTRL0          0x00
+#define USBFS_UC_SYS_CTRL1          0x10
+#define USBFS_UC_SYS_CTRL2          0x20
+#define USBFS_UC_SYS_CTRL3          0x30
+#define USBFS_UC_INT_BUSY           0x08
+#define USBFS_UC_RESET_SIE          0x04
+#define USBFS_UC_CLR_ALL            0x02
+#define USBFS_UC_DMA_EN             0x01
+
+/* R8_USB_INT_EN */
+#define USBFS_UIE_DEV_NAK           0x40
+#define USBFS_UIE_FIFO_OV           0x10
+#define USBFS_UIE_HST_SOF           0x08
+#define USBFS_UIE_SUSPEND           0x04
+#define USBFS_UIE_TRANSFER          0x02
+#define USBFS_UIE_DETECT            0x01
+#define USBFS_UIE_BUS_RST           0x01
+
+/* R8_USB_DEV_AD */
+#define USBFS_UDA_GP_BIT            0x80
+#define USBFS_USB_ADDR_MASK         0x7F
+
+/* R8_USB_MIS_ST */
+#define USBFS_UMS_SOF_PRES          0x80
+#define USBFS_UMS_SOF_ACT           0x40
+#define USBFS_UMS_SIE_FREE          0x20
+#define USBFS_UMS_R_FIFO_RDY        0x10
+#define USBFS_UMS_BUS_RESET         0x08
+#define USBFS_UMS_SUSPEND           0x04
+#define USBFS_UMS_DM_LEVEL          0x02
+#define USBFS_UMS_DEV_ATTACH        0x01
+
+/* R8_USB_INT_FG */
+#define USBFS_U_IS_NAK              0x80    // RO, indicate current USB transfer is NAK received
+#define USBFS_U_TOG_OK              0x40    // RO, indicate current USB transfer toggle is OK
+#define USBFS_U_SIE_FREE            0x20    // RO, indicate USB SIE free status
+#define USBFS_UIF_FIFO_OV           0x10    // FIFO overflow interrupt flag for USB, direct bit address clear or write 1 to clear
+#define USBFS_UIF_HST_SOF           0x08    // host SOF timer interrupt flag for USB host, direct bit address clear or write 1 to clear
+#define USBFS_UIF_SUSPEND           0x04    // USB suspend or resume event interrupt flag, direct bit address clear or write 1 to clear
+#define USBFS_UIF_TRANSFER          0x02    // USB transfer completion interrupt flag, direct bit address clear or write 1 to clear
+#define USBFS_UIF_DETECT            0x01    // device detected event interrupt flag for USB host mode, direct bit address clear or write 1 to clear
+#define USBFS_UIF_BUS_RST           0x01    // bus reset event interrupt flag for USB device mode, direct bit address clear or write 1 to clear
+
+/* R8_USB_INT_ST */
+#define USBFS_UIS_IS_NAK            0x80      // RO, indicate current USB transfer is NAK received for USB device mode
+#define USBFS_UIS_TOG_OK            0x40      // RO, indicate current USB transfer toggle is OK
+#define USBFS_UIS_TOKEN_MASK        0x30      // RO, bit mask of current token PID code received for USB device mode
+#define USBFS_UIS_TOKEN_OUT         0x00
+#define USBFS_UIS_TOKEN_IN          0x20
+#define USBFS_UIS_TOKEN_SETUP       0x30
+// bUIS_TOKEN1 & bUIS_TOKEN0: current token PID code received for USB device mode
+//   00: OUT token PID received
+//   10: IN token PID received
+//   11: SETUP token PID received
+#define USBFS_UIS_ENDP_MASK         0x0F      // RO, bit mask of current transfer endpoint number for USB device mode
+#define USBFS_UIS_H_RES_MASK        0x0F      // RO, bit mask of current transfer handshake response for USB host mode: 0000=no response, time out from device, others=handshake response PID received
+
+/* R32_USB_OTG_CR */
+#define USBFS_CR_SESS_VTH           0x20
+#define USBFS_CR_VBUS_VTH           0x10
+#define USBFS_CR_OTG_EN             0x08
+#define USBFS_CR_IDPU               0x04
+#define USBFS_CR_CHARGE_VBUS        0x02
+#define USBFS_CR_DISCHAR_VBUS       0x01
+
+/* R32_USB_OTG_SR */
+#define USBFS_SR_ID_DIG             0x08
+#define USBFS_SR_SESS_END           0x04
+#define USBFS_SR_SESS_VLD           0x02
+#define USBFS_SR_VBUS_VLD           0x01
+
+/* R8_UDEV_CTRL */
+#define USBFS_UD_PD_DIS             0x80      // disable USB UDP/UDM pulldown resistance: 0=enable pulldown, 1=disable
+#define USBFS_UD_DP_PIN             0x20      // ReadOnly: indicate current UDP pin level
+#define USBFS_UD_DM_PIN             0x10      // ReadOnly: indicate current UDM pin level
+#define USBFS_UD_LOW_SPEED          0x04      // enable USB physical port low speed: 0=full speed, 1=low speed
+#define USBFS_UD_GP_BIT             0x02      // general purpose bit
+#define USBFS_UD_PORT_EN            0x01      // enable USB physical port I/O: 0=disable, 1=enable
+
+/* R8_UEP4_1_MOD */
+#define USBFS_UEP1_RX_EN            0x80      // enable USB endpoint 1 receiving (OUT)
+#define USBFS_UEP1_TX_EN            0x40      // enable USB endpoint 1 transmittal (IN)
+#define USBFS_UEP1_BUF_MOD          0x10      // buffer mode of USB endpoint 1
+#define USBFS_UEP4_RX_EN            0x08      // enable USB endpoint 4 receiving (OUT)
+#define USBFS_UEP4_TX_EN            0x04      // enable USB endpoint 4 transmittal (IN)
+#define USBFS_UEP4_BUF_MOD          0x01
+
+/* R8_UEP2_3_MOD */
+#define USBFS_UEP3_RX_EN            0x80      // enable USB endpoint 3 receiving (OUT)
+#define USBFS_UEP3_TX_EN            0x40      // enable USB endpoint 3 transmittal (IN)
+#define USBFS_UEP3_BUF_MOD          0x10      // buffer mode of USB endpoint 3
+#define USBFS_UEP2_RX_EN            0x08      // enable USB endpoint 2 receiving (OUT)
+#define USBFS_UEP2_TX_EN            0x04      // enable USB endpoint 2 transmittal (IN)
+#define USBFS_UEP2_BUF_MOD          0x01      // buffer mode of USB endpoint 2
+
+/* R8_UEP5_6_MOD */
+#define USBFS_UEP6_RX_EN            0x80      // enable USB endpoint 6 receiving (OUT)
+#define USBFS_UEP6_TX_EN            0x40      // enable USB endpoint 6 transmittal (IN)
+#define USBFS_UEP6_BUF_MOD          0x10      // buffer mode of USB endpoint 6
+#define USBFS_UEP5_RX_EN            0x08      // enable USB endpoint 5 receiving (OUT)
+#define USBFS_UEP5_TX_EN            0x04      // enable USB endpoint 5 transmittal (IN)
+#define USBFS_UEP5_BUF_MOD          0x01      // buffer mode of USB endpoint 5
+
+/* R8_UEP7_MOD */
+#define USBFS_UEP7_RX_EN            0x08      // enable USB endpoint 7 receiving (OUT)
+#define USBFS_UEP7_TX_EN            0x04      // enable USB endpoint 7 transmittal (IN)
+#define USBFS_UEP7_BUF_MOD          0x01      // buffer mode of USB endpoint 7
+
+/* R8_UEPn_TX_CTRL */
+#define USBFS_UEP_T_AUTO_TOG        0x08      // enable automatic toggle after successful transfer completion on endpoint 1/2/3: 0=manual toggle, 1=automatic toggle
+#define USBFS_UEP_T_TOG             0x04      // prepared data toggle flag of USB endpoint X transmittal (IN): 0=DATA0, 1=DATA1
+#define USBFS_UEP_T_RES_MASK        0x03      // bit mask of handshake response type for USB endpoint X transmittal (IN)
+#define USBFS_UEP_T_RES_ACK         0x00
+#define USBFS_UEP_T_RES_NONE        0x01
+#define USBFS_UEP_T_RES_NAK         0x02
+#define USBFS_UEP_T_RES_STALL       0x03
+// bUEP_T_RES1 & bUEP_T_RES0: handshake response type for USB endpoint X transmittal (IN)
+//   00: DATA0 or DATA1 then expecting ACK (ready)
+//   01: DATA0 or DATA1 then expecting no response, time out from host, for non-zero endpoint isochronous transactions
+//   10: NAK (busy)
+//   11: STALL (error)
+// host aux setup
+
+/* R8_UEPn_RX_CTRL, n=0-7 */
+#define USBFS_UEP_R_AUTO_TOG        0x08      // enable automatic toggle after successful transfer completion on endpoint 1/2/3: 0=manual toggle, 1=automatic toggle
+#define USBFS_UEP_R_TOG             0x04      // expected data toggle flag of USB endpoint X receiving (OUT): 0=DATA0, 1=DATA1
+#define USBFS_UEP_R_RES_MASK        0x03      // bit mask of handshake response type for USB endpoint X receiving (OUT)
+#define USBFS_UEP_R_RES_ACK         0x00
+#define USBFS_UEP_R_RES_NONE        0x01
+#define USBFS_UEP_R_RES_NAK         0x02
+#define USBFS_UEP_R_RES_STALL       0x03
+// RB_UEP_R_RES1 & RB_UEP_R_RES0: handshake response type for USB endpoint X receiving (OUT)
+//   00: ACK (ready)
+//   01: no response, time out to host, for non-zero endpoint isochronous transactions
+//   10: NAK (busy)
+//   11: STALL (error)
+
+/* R8_UHOST_CTRL */
+#define USBFS_UH_PD_DIS             0x80      // disable USB UDP/UDM pulldown resistance: 0=enable pulldown, 1=disable
+#define USBFS_UH_DP_PIN             0x20      // ReadOnly: indicate current UDP pin level
+#define USBFS_UH_DM_PIN             0x10      // ReadOnly: indicate current UDM pin level
+#define USBFS_UH_LOW_SPEED          0x04      // enable USB port low speed: 0=full speed, 1=low speed
+#define USBFS_UH_BUS_RESET          0x02      // control USB bus reset: 0=normal, 1=force bus reset
+#define USBFS_UH_PORT_EN            0x01      // enable USB port: 0=disable, 1=enable port, automatic disabled if USB device detached
+
+/* R32_UH_EP_MOD */
+#define USBFS_UH_EP_TX_EN           0x40      // enable USB host OUT endpoint transmittal
+#define USBFS_UH_EP_TBUF_MOD        0x10      // buffer mode of USB host OUT endpoint
+// bUH_EP_TX_EN & bUH_EP_TBUF_MOD: USB host OUT endpoint buffer mode, buffer start address is UH_TX_DMA
+//   0 x:  disable endpoint and disable buffer
+//   1 0:  64 bytes buffer for transmittal (OUT endpoint)
+//   1 1:  dual 64 bytes buffer by toggle bit bUH_T_TOG selection for transmittal (OUT endpoint), total=128bytes
+#define USBFS_UH_EP_RX_EN           0x08      // enable USB host IN endpoint receiving
+#define USBFS_UH_EP_RBUF_MOD        0x01      // buffer mode of USB host IN endpoint
+// bUH_EP_RX_EN & bUH_EP_RBUF_MOD: USB host IN endpoint buffer mode, buffer start address is UH_RX_DMA
+//   0 x:  disable endpoint and disable buffer
+//   1 0:  64 bytes buffer for receiving (IN endpoint)
+//   1 1:  dual 64 bytes buffer by toggle bit bUH_R_TOG selection for receiving (IN endpoint), total=128bytes
+
+/* R16_UH_SETUP */
+#define USBFS_UH_PRE_PID_EN         0x0400      // USB host PRE PID enable for low speed device via hub
+#define USBFS_UH_SOF_EN             0x0004      // USB host automatic SOF enable
+
+/* R8_UH_EP_PID */
+#define USBFS_UH_TOKEN_MASK         0xF0      // bit mask of token PID for USB host transfer
+#define USBFS_UH_ENDP_MASK          0x0F      // bit mask of endpoint number for USB host transfer
+
+/* R8_UH_RX_CTRL */
+#define USBFS_UH_R_AUTO_TOG         0x08      // enable automatic toggle after successful transfer completion: 0=manual toggle, 1=automatic toggle
+#define USBFS_UH_R_TOG              0x04      // expected data toggle flag of host receiving (IN): 0=DATA0, 1=DATA1
+#define USBFS_UH_R_RES              0x01      // prepared handshake response type for host receiving (IN): 0=ACK (ready), 1=no response, time out to device, for isochronous transactions
+
+/* R8_UH_TX_CTRL */
+#define USBFS_UH_T_AUTO_TOG         0x08      // enable automatic toggle after successful transfer completion: 0=manual toggle, 1=automatic toggle
+#define USBFS_UH_T_TOG              0x04      // prepared data toggle flag of host transmittal (SETUP/OUT): 0=DATA0, 1=DATA1
+#define USBFS_UH_T_RES              0x01      // expected handshake response type for host transmittal (SETUP/OUT): 0=ACK (ready), 1=no response, time out from device, for isochronous transactions
+
+
+/*******************************************************************************/
+/* Struct Definition */
+
+/* USB Setup Request */
+typedef struct __attribute__((packed)) _USB_SETUP_REQ
+{
+    uint8_t  bRequestType;
+    uint8_t  bRequest;
+    uint16_t wValue;
+    uint16_t wIndex;
+    uint16_t wLength;
+} USB_SETUP_REQ, *PUSB_SETUP_REQ;
+
+/* USB Device Descriptor */
+typedef struct __attribute__((packed)) _USB_DEVICE_DESCR
+{
+    uint8_t  bLength;
+    uint8_t  bDescriptorType;
+    uint16_t bcdUSB;
+    uint8_t  bDeviceClass;
+    uint8_t  bDeviceSubClass;
+    uint8_t  bDeviceProtocol;
+    uint8_t  bMaxPacketSize0;
+    uint16_t idVendor;
+    uint16_t idProduct;
+    uint16_t bcdDevice;
+    uint8_t  iManufacturer;
+    uint8_t  iProduct;
+    uint8_t  iSerialNumber;
+    uint8_t  bNumConfigurations;
+} USB_DEV_DESCR, *PUSB_DEV_DESCR;
+
+/* USB Configuration Descriptor */
+typedef struct __attribute__((packed)) _USB_CONFIG_DESCR
+{
+    uint8_t  bLength;
+    uint8_t  bDescriptorType;
+    uint16_t wTotalLength;
+    uint8_t  bNumInterfaces;
+    uint8_t  bConfigurationValue;
+    uint8_t  iConfiguration;
+    uint8_t  bmAttributes;
+    uint8_t  MaxPower;
+} USB_CFG_DESCR, *PUSB_CFG_DESCR;
+
+/* USB Interface Descriptor */
+typedef struct __attribute__((packed)) _USB_INTERF_DESCR
+{
+    uint8_t  bLength;
+    uint8_t  bDescriptorType;
+    uint8_t  bInterfaceNumber;
+    uint8_t  bAlternateSetting;
+    uint8_t  bNumEndpoints;
+    uint8_t  bInterfaceClass;
+    uint8_t  bInterfaceSubClass;
+    uint8_t  bInterfaceProtocol;
+    uint8_t  iInterface;
+} USB_ITF_DESCR, *PUSB_ITF_DESCR;
+
+/* USB Endpoint Descriptor */
+typedef struct __attribute__((packed)) _USB_ENDPOINT_DESCR
+{
+    uint8_t  bLength;
+    uint8_t  bDescriptorType;
+    uint8_t  bEndpointAddress;
+    uint8_t  bmAttributes;
+    uint8_t  wMaxPacketSizeL;
+    uint8_t  wMaxPacketSizeH;
+    uint8_t  bInterval;
+} USB_ENDP_DESCR, *PUSB_ENDP_DESCR;
+
+/* USB Configuration Descriptor Set */
+typedef struct __attribute__((packed)) _USB_CONFIG_DESCR_LONG
+{
+    USB_CFG_DESCR  cfg_descr;
+    USB_ITF_DESCR  itf_descr;
+    USB_ENDP_DESCR endp_descr[ 1 ];
+} USB_CFG_DESCR_LONG, *PUSB_CFG_DESCR_LONG;
+
+/* USB HUB Descriptor */
+typedef struct __attribute__((packed)) _USB_HUB_DESCR
+{
+    uint8_t  bDescLength;
+    uint8_t  bDescriptorType;
+    uint8_t  bNbrPorts;
+    uint8_t  wHubCharacteristicsL;
+    uint8_t  wHubCharacteristicsH;
+    uint8_t  bPwrOn2PwrGood;
+    uint8_t  bHubContrCurrent;
+    uint8_t  DeviceRemovable;
+    uint8_t  PortPwrCtrlMask;
+} USB_HUB_DESCR, *PUSB_HUB_DESCR;
+
+/* USB HID Descriptor */
+typedef struct __attribute__((packed)) _USB_HID_DESCR
+{
+    uint8_t  bLength;
+    uint8_t  bDescriptorType;
+    uint16_t bcdHID;
+    uint8_t  bCountryCode;
+    uint8_t  bNumDescriptors;
+    uint8_t  bDescriptorTypeX;
+    uint8_t  wDescriptorLengthL;
+    uint8_t  wDescriptorLengthH;
+} USB_HID_DESCR, *PUSB_HID_DESCR;
+
+/* USB UDisk */
+typedef struct __attribute__((packed)) _UDISK_BOC_CBW
+{
+    uint32_t mCBW_Sig;
+    uint32_t mCBW_Tag;
+    uint32_t mCBW_DataLen;
+    uint8_t  mCBW_Flag;
+    uint8_t  mCBW_LUN;
+    uint8_t  mCBW_CB_Len;
+    uint8_t  mCBW_CB_Buf[ 16 ];
+} UDISK_BOC_CBW, *PXUDISK_BOC_CBW;
+
+/* USB UDisk */
+typedef struct __attribute__((packed)) _UDISK_BOC_CSW
+{
+    uint32_t mCBW_Sig;
+    uint32_t mCBW_Tag;
+    uint32_t mCSW_Residue;
+    uint8_t  mCSW_Status;
+} UDISK_BOC_CSW, *PXUDISK_BOC_CSW;
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_CH32V20X_USB_H */

src/peripheral/inc/ch32v20x_wwdg.h

@@ -0,0 +1,41 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_wwdg.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file contains all the functions prototypes for the WWDG
+ *                      firmware library.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __CH32V20x_WWDG_H
+#define __CH32V20x_WWDG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "ch32v20x.h"
+
+/* WWDG_Prescaler */
+#define WWDG_Prescaler_1    ((uint32_t)0x00000000)
+#define WWDG_Prescaler_2    ((uint32_t)0x00000080)
+#define WWDG_Prescaler_4    ((uint32_t)0x00000100)
+#define WWDG_Prescaler_8    ((uint32_t)0x00000180)
+
+void       WWDG_DeInit(void);
+void       WWDG_SetPrescaler(uint32_t WWDG_Prescaler);
+void       WWDG_SetWindowValue(uint8_t WindowValue);
+void       WWDG_EnableIT(void);
+void       WWDG_SetCounter(uint8_t Counter);
+void       WWDG_Enable(uint8_t Counter);
+FlagStatus WWDG_GetFlagStatus(void);
+void       WWDG_ClearFlag(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

src/peripheral/src/ch32v20x_bkp.c

@@ -0,0 +1,244 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_bkp.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2023/01/06
+ * Description        : This file provides all the BKP firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_bkp.h"
+#include "ch32v20x_rcc.h"
+
+/* BKP registers bit mask */
+
+/* OCTLR register bit mask */
+#define OCTLR_CAL_MASK    ((uint16_t)0xFF80)
+#define OCTLR_MASK        ((uint16_t)0xFC7F)
+
+/*********************************************************************
+ * @fn      BKP_DeInit
+ *
+ * @brief   Deinitializes the BKP peripheral registers to their default reset values.
+ *
+ * @return  none
+ */
+void BKP_DeInit(void)
+{
+    RCC_BackupResetCmd(ENABLE);
+    RCC_BackupResetCmd(DISABLE);
+}
+
+/*********************************************************************
+ * @fn      BKP_TamperPinLevelConfig
+ *
+ * @brief   Configures the Tamper Pin active level.
+ *
+ * @param   BKP_TamperPinLevel: specifies the Tamper Pin active level.
+ *            BKP_TamperPinLevel_High - Tamper pin active on high level.
+ *            BKP_TamperPinLevel_Low - Tamper pin active on low level.
+ *
+ * @return  none
+ */
+void BKP_TamperPinLevelConfig(uint16_t BKP_TamperPinLevel)
+{
+    if(BKP_TamperPinLevel)
+    {
+        BKP->TPCTLR |= (1 << 1);
+    }
+    else
+    {
+        BKP->TPCTLR &= ~(1 << 1);
+    }
+}
+
+/*********************************************************************
+ * @fn      BKP_TamperPinCmd
+ *
+ * @brief   Enables or disables the Tamper Pin activation.
+ *
+ * @param   NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void BKP_TamperPinCmd(FunctionalState NewState)
+{
+    if(NewState)
+    {
+        BKP->TPCTLR |= (1 << 0);
+    }
+    else
+    {
+        BKP->TPCTLR &= ~(1 << 0);
+    }
+}
+
+/*********************************************************************
+ * @fn      BKP_ITConfig
+ *
+ * @brief   Enables or disables the Tamper Pin Interrupt.
+ *
+ * @param   NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void BKP_ITConfig(FunctionalState NewState)
+{
+    if(NewState)
+    {
+        BKP->TPCSR |= (1 << 2);
+    }
+    else
+    {
+        BKP->TPCSR &= ~(1 << 2);
+    }
+}
+
+/*********************************************************************
+ * @fn      BKP_RTCOutputConfig
+ *
+ * @brief   Select the RTC output source to output on the Tamper pin.
+ *
+ * @param   BKP_RTCOutputSource - specifies the RTC output source.
+ *            BKP_RTCOutputSource_None - no RTC output on the Tamper pin.
+ *            BKP_RTCOutputSource_CalibClock - output the RTC clock with
+ *        frequency divided by 64 on the Tamper pin.
+ *            BKP_RTCOutputSource_Alarm - output the RTC Alarm pulse signal
+ *        on the Tamper pin.
+ *            BKP_RTCOutputSource_Second - output the RTC Second pulse
+ *        signal on the Tamper pin.
+ *
+ * @return  none
+ */
+void BKP_RTCOutputConfig(uint16_t BKP_RTCOutputSource)
+{
+    uint16_t tmpreg = 0;
+
+    tmpreg = BKP->OCTLR;
+    tmpreg &= OCTLR_MASK;
+    tmpreg |= BKP_RTCOutputSource;
+    BKP->OCTLR = tmpreg;
+}
+
+/*********************************************************************
+ * @fn      BKP_SetRTCCalibrationValue
+ *
+ * @brief   Sets RTC Clock Calibration value.
+ *
+ * @param   CalibrationValue - specifies the RTC Clock Calibration value.
+ *            This parameter must be a number between 0 and 0x7F.
+ *
+ * @return  none
+ */
+void BKP_SetRTCCalibrationValue(uint8_t CalibrationValue)
+{
+    uint16_t tmpreg = 0;
+
+    tmpreg = BKP->OCTLR;
+    tmpreg &= OCTLR_CAL_MASK;
+    tmpreg |= CalibrationValue;
+    BKP->OCTLR = tmpreg;
+}
+
+/*********************************************************************
+ * @fn      BKP_WriteBackupRegister
+ *
+ * @brief   Writes user data to the specified Data Backup Register.
+ *
+ * @param   BKP_DR - specifies the Data Backup Register.
+ *          Data - data to write.
+ *
+ * @return  none
+ */
+void BKP_WriteBackupRegister(uint16_t BKP_DR, uint16_t Data)
+{
+    __IO uint32_t tmp = 0;
+
+    tmp = (uint32_t)BKP_BASE;
+    tmp += BKP_DR;
+    *(__IO uint32_t *)tmp = Data;
+}
+
+/*********************************************************************
+ * @fn      BKP_ReadBackupRegister
+ *
+ * @brief   Reads data from the specified Data Backup Register.
+ *
+ * @param   BKP_DR - specifies the Data Backup Register.
+ *            This parameter can be BKP_DRx where x=[1, 42].
+ *
+ * @return  none
+ */
+uint16_t BKP_ReadBackupRegister(uint16_t BKP_DR)
+{
+    __IO uint32_t tmp = 0;
+
+    tmp = (uint32_t)BKP_BASE;
+    tmp += BKP_DR;
+
+    return (*(__IO uint16_t *)tmp);
+}
+
+/*********************************************************************
+ * @fn      BKP_GetFlagStatus
+ *
+ * @brief   Checks whether the Tamper Pin Event flag is set or not.
+ *
+ * @return  FlagStatus - SET or RESET.
+ */
+FlagStatus BKP_GetFlagStatus(void)
+{
+    if(BKP->TPCSR & (1 << 8))
+    {
+        return SET;
+    }
+    else
+    {
+        return RESET;
+    }
+}
+
+/*********************************************************************
+ * @fn      BKP_ClearFlag
+ *
+ * @brief   Clears Tamper Pin Event pending flag.
+ *
+ * @return  none
+ */
+void BKP_ClearFlag(void)
+{
+    BKP->TPCSR |= BKP_CTE;
+}
+
+/*********************************************************************
+ * @fn      BKP_GetITStatus
+ *
+ * @brief   Checks whether the Tamper Pin Interrupt has occurred or not.
+ *
+ * @return  ITStatus - SET or RESET.
+ */
+ITStatus BKP_GetITStatus(void)
+{
+    if(BKP->TPCSR & (1 << 9))
+    {
+        return SET;
+    }
+    else
+    {
+        return RESET;
+    }
+}
+
+/*********************************************************************
+ * @fn      BKP_ClearITPendingBit
+ *
+ * @brief   Clears Tamper Pin Interrupt pending bit.
+ *
+ * @return  none
+ */
+void BKP_ClearITPendingBit(void)
+{
+    BKP->TPCSR |= BKP_CTI;
+}

src/peripheral/src/ch32v20x_crc.c

@@ -0,0 +1,99 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_crc.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the CRC firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_crc.h"
+
+/*********************************************************************
+ * @fn      CRC_ResetDR
+ *
+ * @brief   Resets the CRC Data register (DR).
+ *
+ * @return  none
+ */
+void CRC_ResetDR(void)
+{
+    CRC->CTLR = CRC_CTLR_RESET;
+}
+
+/*********************************************************************
+ * @fn      CRC_CalcCRC
+ *
+ * @brief   Computes the 32-bit CRC of a given data word(32-bit).
+ *
+ * @param   Data - data word(32-bit) to compute its CRC.
+ *
+ * @return  32-bit CRC.
+ */
+uint32_t CRC_CalcCRC(uint32_t Data)
+{
+    CRC->DATAR = Data;
+
+    return (CRC->DATAR);
+}
+
+/*********************************************************************
+ * @fn      CRC_CalcBlockCRC
+ *
+ * @brief   Computes the 32-bit CRC of a given buffer of data word(32-bit).
+ *
+ * @param   pBuffer - pointer to the buffer containing the data to be computed.
+ *          BufferLength - length of the buffer to be computed.
+ *
+ * @return  32-bit CRC.
+ */
+uint32_t CRC_CalcBlockCRC(uint32_t pBuffer[], uint32_t BufferLength)
+{
+    uint32_t index = 0;
+
+    for(index = 0; index < BufferLength; index++){
+        CRC->DATAR = pBuffer[index];
+    }
+
+    return (CRC->DATAR);
+}
+
+/*********************************************************************
+ * @fn      CRC_GetCRC
+ *
+ * @brief   Returns the current CRC value.
+ *
+ * @return  32-bit CRC.
+ */
+uint32_t CRC_GetCRC(void)
+{
+    return (CRC->DATAR);
+}
+
+/*********************************************************************
+ * @fn      CRC_SetIDRegister
+ *
+ * @brief   Stores a 8-bit data in the Independent Data(ID) register.
+ *
+ * @param   IDValue - 8-bit value to be stored in the ID register.
+ *
+ * @return  none
+ */
+void CRC_SetIDRegister(uint8_t IDValue)
+{
+    CRC->IDATAR = IDValue;
+}
+
+/*********************************************************************
+ * @fn      CRC_GetIDRegister
+ *
+ * @brief   Returns the 8-bit data stored in the Independent Data(ID) register.
+ *
+ * @return  8-bit value of the ID register.
+ */
+uint8_t CRC_GetIDRegister(void)
+{
+    return (CRC->IDATAR);
+}

src/peripheral/src/ch32v20x_dbgmcu.c

@@ -0,0 +1,126 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_dbgmcu.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the DBGMCU firmware functions.
+ *********************************************************************************
+ * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+ * Attention: This software (modified or not) and binary are used for 
+ * microcontroller manufactured by Nanjing Qinheng Microelectronics.
+ *******************************************************************************/
+#include "ch32v20x_dbgmcu.h"
+
+#define IDCODE_DEVID_MASK    ((uint32_t)0x0000FFFF)
+
+/*********************************************************************
+ * @fn      DBGMCU_GetREVID
+ *
+ * @brief   Returns the device revision identifier.
+ *
+ * @return  Revision identifier.
+ */
+uint32_t DBGMCU_GetREVID(void)
+{
+	return ((*(uint32_t *)0x1FFFF704) >> 16);
+}
+
+/*********************************************************************
+ * @fn      DBGMCU_GetDEVID
+ *
+ * @brief   Returns the device identifier.
+ *
+ * @return  Device identifier.
+ */
+uint32_t DBGMCU_GetDEVID(void)
+{
+	return ((*(uint32_t *)0x1FFFF704) & IDCODE_DEVID_MASK);
+}
+
+/*********************************************************************
+ * @fn      __get_DEBUG_CR
+ *
+ * @brief   Return the DEBUGE Control Register
+ *
+ * @return  DEBUGE Control value
+ */
+uint32_t __get_DEBUG_CR(void)
+{
+	uint32_t result;
+
+	__asm volatile("csrr %0,""0x7C0" : "=r"(result));
+	return (result);
+}
+
+/*********************************************************************
+ * @fn      __set_DEBUG_CR
+ *
+ * @brief   Set the DEBUGE Control Register
+ *
+ * @param   value  - set DEBUGE Control value
+ *
+ * @return  none
+ */
+void __set_DEBUG_CR(uint32_t value)
+{
+	__asm volatile("csrw 0x7C0, %0" : : "r"(value));
+}
+
+
+/*********************************************************************
+ * @fn      DBGMCU_Config
+ *
+ * @brief   Configures the specified peripheral and low power mode behavior
+ *        when the MCU under Debug mode.
+ *
+ * @param   DBGMCU_Periph - specifies the peripheral and low power mode.
+ *            DBGMCU_IWDG_STOP - Debug IWDG stopped when Core is halted
+ *            DBGMCU_WWDG_STOP - Debug WWDG stopped when Core is halted
+ *            DBGMCU_TIM1_STOP - TIM1 counter stopped when Core is halted
+ *            DBGMCU_TIM2_STOP - TIM2 counter stopped when Core is halted
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void DBGMCU_Config(uint32_t DBGMCU_Periph, FunctionalState NewState)
+{
+	uint32_t val;
+
+	if(NewState != DISABLE)
+	{
+		__set_DEBUG_CR(DBGMCU_Periph);
+	}
+	else
+	{
+		val = __get_DEBUG_CR();
+		val &= ~(uint32_t)DBGMCU_Periph;
+		__set_DEBUG_CR(val);
+	}
+
+}
+/*********************************************************************
+ * @fn      DBGMCU_GetCHIPID
+ *
+ * @brief   Returns the CHIP identifier.
+ *
+ * @return Device identifier.
+ *          ChipID List-
+ *	CH32V203C8U6-0x203005x0
+ * 	CH32V203C8T6-0x203105x0
+ *  CH32V203K8T6-0x203205x0
+ *  CH32V203C6T6-0x203305x0
+ *  CH32V203G6U6-0x203605x0
+ *  CH32V203G8R6-0x203B05x0
+ *  CH32V203F8U6-0x203E05x0
+ *  CH32V203F6P6-0x203705x0-0x203905x0
+ *  CH32V203F8P6-0x203A05x0
+ *  CH32V203RBT6-0x203405xC
+ *  CH32V208WBU6-0x208005xC
+ *  CH32V208RBT6-0x208105xC
+ *  CH32V208CBU6-0x208205xC
+ *  CH32V208GBU6-0x208305xC
+ */
+uint32_t DBGMCU_GetCHIPID( void )
+{
+	return( *( uint32_t * )0x1FFFF704 );
+}

src/peripheral/src/ch32v20x_dma.c

@@ -0,0 +1,432 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_dma.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the DMA firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_dma.h"
+#include "ch32v20x_rcc.h"
+
+/* DMA1 Channelx interrupt pending bit masks */
+#define DMA1_Channel1_IT_Mask    ((uint32_t)(DMA_GIF1 | DMA_TCIF1 | DMA_HTIF1 | DMA_TEIF1))
+#define DMA1_Channel2_IT_Mask    ((uint32_t)(DMA_GIF2 | DMA_TCIF2 | DMA_HTIF2 | DMA_TEIF2))
+#define DMA1_Channel3_IT_Mask    ((uint32_t)(DMA_GIF3 | DMA_TCIF3 | DMA_HTIF3 | DMA_TEIF3))
+#define DMA1_Channel4_IT_Mask    ((uint32_t)(DMA_GIF4 | DMA_TCIF4 | DMA_HTIF4 | DMA_TEIF4))
+#define DMA1_Channel5_IT_Mask    ((uint32_t)(DMA_GIF5 | DMA_TCIF5 | DMA_HTIF5 | DMA_TEIF5))
+#define DMA1_Channel6_IT_Mask    ((uint32_t)(DMA_GIF6 | DMA_TCIF6 | DMA_HTIF6 | DMA_TEIF6))
+#define DMA1_Channel7_IT_Mask    ((uint32_t)(DMA_GIF7 | DMA_TCIF7 | DMA_HTIF7 | DMA_TEIF7))
+#define DMA1_Channel8_IT_Mask    ((uint32_t)(DMA_GIF8 | DMA_TCIF8 | DMA_HTIF8 | DMA_TEIF8))
+
+/* DMA2 FLAG mask */
+#define FLAG_Mask                ((uint32_t)0x10000000)
+
+/* DMA registers Masks */
+#define CFGR_CLEAR_Mask          ((uint32_t)0xFFFF800F)
+
+/*********************************************************************
+ * @fn      DMA_DeInit
+ *
+ * @brief   Deinitializes the DMAy Channelx registers to their default
+ *        reset values.
+ *
+ * @param   DMAy_Channelx - here y can be 1 or 2 to select the DMA and x can be
+ *        1 to 7 for DMA1 and 1 to 11 for DMA2 to select the DMA Channel.
+ *
+ * @return  none
+ */
+void DMA_DeInit(DMA_Channel_TypeDef *DMAy_Channelx)
+{
+    DMAy_Channelx->CFGR &= (uint16_t)(~DMA_CFGR1_EN);
+    DMAy_Channelx->CFGR = 0;
+    DMAy_Channelx->CNTR = 0;
+    DMAy_Channelx->PADDR = 0;
+    DMAy_Channelx->MADDR = 0;
+    if(DMAy_Channelx == DMA1_Channel1)
+    {
+        DMA1->INTFCR |= DMA1_Channel1_IT_Mask;
+    }
+    else if(DMAy_Channelx == DMA1_Channel2)
+    {
+        DMA1->INTFCR |= DMA1_Channel2_IT_Mask;
+    }
+    else if(DMAy_Channelx == DMA1_Channel3)
+    {
+        DMA1->INTFCR |= DMA1_Channel3_IT_Mask;
+    }
+    else if(DMAy_Channelx == DMA1_Channel4)
+    {
+        DMA1->INTFCR |= DMA1_Channel4_IT_Mask;
+    }
+    else if(DMAy_Channelx == DMA1_Channel5)
+    {
+        DMA1->INTFCR |= DMA1_Channel5_IT_Mask;
+    }
+    else if(DMAy_Channelx == DMA1_Channel6)
+    {
+        DMA1->INTFCR |= DMA1_Channel6_IT_Mask;
+    }
+    else if(DMAy_Channelx == DMA1_Channel7)
+    {
+        DMA1->INTFCR |= DMA1_Channel7_IT_Mask;
+    }
+    else if(DMAy_Channelx == DMA1_Channel8)
+    {
+        DMA1->INTFCR |= DMA1_Channel8_IT_Mask;
+    }
+}
+
+/*********************************************************************
+ * @fn      DMA_Init
+ *
+ * @brief   Initializes the DMAy Channelx according to the specified
+ *        parameters in the DMA_InitStruct.
+ *
+ * @param   DMAy_Channelx - here y can be 1 or 2 to select the DMA and x can be
+ *        1 to 7 for DMA1 and 1 to 11 for DMA2 to select the DMA Channel.
+ *          DMA_InitStruct - pointer to a DMA_InitTypeDef structure that contains
+ *        contains the configuration information for the specified DMA Channel.
+ *
+ * @return  none
+ */
+void DMA_Init(DMA_Channel_TypeDef *DMAy_Channelx, DMA_InitTypeDef *DMA_InitStruct)
+{
+    uint32_t tmpreg = 0;
+
+    tmpreg = DMAy_Channelx->CFGR;
+    tmpreg &= CFGR_CLEAR_Mask;
+    tmpreg |= DMA_InitStruct->DMA_DIR | DMA_InitStruct->DMA_Mode |
+              DMA_InitStruct->DMA_PeripheralInc | DMA_InitStruct->DMA_MemoryInc |
+              DMA_InitStruct->DMA_PeripheralDataSize | DMA_InitStruct->DMA_MemoryDataSize |
+              DMA_InitStruct->DMA_Priority | DMA_InitStruct->DMA_M2M;
+
+    DMAy_Channelx->CFGR = tmpreg;
+    DMAy_Channelx->CNTR = DMA_InitStruct->DMA_BufferSize;
+    DMAy_Channelx->PADDR = DMA_InitStruct->DMA_PeripheralBaseAddr;
+    DMAy_Channelx->MADDR = DMA_InitStruct->DMA_MemoryBaseAddr;
+}
+
+/*********************************************************************
+ * @fn      DMA_StructInit
+ *
+ * @brief   Fills each DMA_InitStruct member with its default value.
+ *
+ * @param   DMAy_Channelx - here y can be 1 or 2 to select the DMA and x can be
+ *        1 to 7 for DMA1 and 1 to 11 for DMA2 to select the DMA Channel.
+ *          DMA_InitStruct - pointer to a DMA_InitTypeDef structure that contains
+ *        contains the configuration information for the specified DMA Channel.
+ *
+ * @return  none
+ */
+void DMA_StructInit(DMA_InitTypeDef *DMA_InitStruct)
+{
+    DMA_InitStruct->DMA_PeripheralBaseAddr = 0;
+    DMA_InitStruct->DMA_MemoryBaseAddr = 0;
+    DMA_InitStruct->DMA_DIR = DMA_DIR_PeripheralSRC;
+    DMA_InitStruct->DMA_BufferSize = 0;
+    DMA_InitStruct->DMA_PeripheralInc = DMA_PeripheralInc_Disable;
+    DMA_InitStruct->DMA_MemoryInc = DMA_MemoryInc_Disable;
+    DMA_InitStruct->DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
+    DMA_InitStruct->DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
+    DMA_InitStruct->DMA_Mode = DMA_Mode_Normal;
+    DMA_InitStruct->DMA_Priority = DMA_Priority_Low;
+    DMA_InitStruct->DMA_M2M = DMA_M2M_Disable;
+}
+
+/*********************************************************************
+ * @fn      DMA_Cmd
+ *
+ * @brief   Enables or disables the specified DMAy Channelx.
+ *
+ * @param   DMAy_Channelx - here y can be 1 or 2 to select the DMA and x can be
+ *        1 to 7 for DMA1 and 1 to 11 for DMA2 to select the DMA Channel.
+ *          NewState - new state of the DMAy Channelx(ENABLE or DISABLE).
+ *
+ * @return  none
+ */
+void DMA_Cmd(DMA_Channel_TypeDef *DMAy_Channelx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        DMAy_Channelx->CFGR |= DMA_CFGR1_EN;
+    }
+    else
+    {
+        DMAy_Channelx->CFGR &= (uint16_t)(~DMA_CFGR1_EN);
+    }
+}
+
+/*********************************************************************
+ * @fn      DMA_ITConfig
+ *
+ * @brief   Enables or disables the specified DMAy Channelx interrupts.
+ *
+ * @param   DMAy_Channelx - here y can be 1 or 2 to select the DMA and x can be
+ *        1 to 7 for DMA1 and 1 to 11 for DMA2 to select the DMA Channel.
+ *          DMA_IT - specifies the DMA interrupts sources to be enabled
+ *        or disabled.
+ *           DMA_IT_TC - Transfer complete interrupt mask
+ *           DMA_IT_HT - Half transfer interrupt mask
+ *           DMA_IT_TE -  Transfer error interrupt mask
+ *          NewState - new state of the DMAy Channelx(ENABLE or DISABLE).
+ *
+ * @return  none
+ */
+void DMA_ITConfig(DMA_Channel_TypeDef *DMAy_Channelx, uint32_t DMA_IT, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        DMAy_Channelx->CFGR |= DMA_IT;
+    }
+    else
+    {
+        DMAy_Channelx->CFGR &= ~DMA_IT;
+    }
+}
+
+/*********************************************************************
+ * @fn      DMA_SetCurrDataCounter
+ *
+ * @brief   Sets the number of data units in the current DMAy Channelx transfer.
+ *
+ * @param   DMAy_Channelx - here y can be 1 or 2 to select the DMA and x can be
+ *        1 to 7 for DMA1 and 1 to 11 for DMA2 to select the DMA Channel.
+ *          DataNumber - The number of data units in the current DMAy Channelx
+ *        transfer.
+ *
+ * @return  none
+ */
+void DMA_SetCurrDataCounter(DMA_Channel_TypeDef *DMAy_Channelx, uint16_t DataNumber)
+{
+    DMAy_Channelx->CNTR = DataNumber;
+}
+
+/*********************************************************************
+ * @fn      DMA_GetCurrDataCounter
+ *
+ * @brief   Returns the number of remaining data units in the current
+ *        DMAy Channelx transfer.
+ *
+ * @param   DMAy_Channelx - here y can be 1 or 2 to select the DMA and x can be
+ *        1 to 7 for DMA1 and 1 to 11 for DMA2 to select the DMA Channel.
+ *
+ * @return  DataNumber - The number of remaining data units in the current
+ *        DMAy Channelx transfer.
+ */
+uint16_t DMA_GetCurrDataCounter(DMA_Channel_TypeDef *DMAy_Channelx)
+{
+    return ((uint16_t)(DMAy_Channelx->CNTR));
+}
+
+/*********************************************************************
+ * @fn      DMA_GetFlagStatus
+ *
+ * @brief   Checks whether the specified DMAy Channelx flag is set or not.
+ *
+ * @param   DMAy_FLAG - specifies the flag to check.
+ *            DMA1_FLAG_GL1 - DMA1 Channel1 global flag.
+ *            DMA1_FLAG_TC1 - DMA1 Channel1 transfer complete flag.
+ *            DMA1_FLAG_HT1 - DMA1 Channel1 half transfer flag.
+ *            DMA1_FLAG_TE1 - DMA1 Channel1 transfer error flag.
+ *            DMA1_FLAG_GL2 - DMA1 Channel2 global flag.
+ *            DMA1_FLAG_TC2 - DMA1 Channel2 transfer complete flag.
+ *            DMA1_FLAG_HT2 - DMA1 Channel2 half transfer flag.
+ *            DMA1_FLAG_TE2 - DMA1 Channel2 transfer error flag.
+ *            DMA1_FLAG_GL3 - DMA1 Channel3 global flag.
+ *            DMA1_FLAG_TC3 - DMA1 Channel3 transfer complete flag.
+ *            DMA1_FLAG_HT3 - DMA1 Channel3 half transfer flag.
+ *            DMA1_FLAG_TE3 - DMA1 Channel3 transfer error flag.
+ *            DMA1_FLAG_GL4 - DMA1 Channel4 global flag.
+ *            DMA1_FLAG_TC4 - DMA1 Channel4 transfer complete flag.
+ *            DMA1_FLAG_HT4 - DMA1 Channel4 half transfer flag.
+ *            DMA1_FLAG_TE4 - DMA1 Channel4 transfer error flag.
+ *            DMA1_FLAG_GL5 - DMA1 Channel5 global flag.
+ *            DMA1_FLAG_TC5 - DMA1 Channel5 transfer complete flag.
+ *            DMA1_FLAG_HT5 - DMA1 Channel5 half transfer flag.
+ *            DMA1_FLAG_TE5 - DMA1 Channel5 transfer error flag.
+ *            DMA1_FLAG_GL6 - DMA1 Channel6 global flag.
+ *            DMA1_FLAG_TC6 - DMA1 Channel6 transfer complete flag.
+ *            DMA1_FLAG_HT6 - DMA1 Channel6 half transfer flag.
+ *            DMA1_FLAG_TE6 - DMA1 Channel6 transfer error flag.
+ *            DMA1_FLAG_GL7 - DMA1 Channel7 global flag.
+ *            DMA1_FLAG_TC7 - DMA1 Channel7 transfer complete flag.
+ *            DMA1_FLAG_HT7 - DMA1 Channel7 half transfer flag.
+ *            DMA1_FLAG_TE7 - DMA1 Channel7 transfer error flag.
+ *            DMA2_FLAG_GL1 - DMA2 Channel1 global flag.
+ *            DMA2_FLAG_TC1 - DMA2 Channel1 transfer complete flag.
+ *            DMA2_FLAG_HT1 - DMA2 Channel1 half transfer flag.
+ *            DMA2_FLAG_TE1 - DMA2 Channel1 transfer error flag.
+
+ * @return  The new state of DMAy_FLAG (SET or RESET).
+ */
+FlagStatus DMA_GetFlagStatus(uint32_t DMAy_FLAG)
+{
+    FlagStatus bitstatus = RESET;
+    uint32_t   tmpreg = 0;
+
+    tmpreg = DMA1->INTFR;
+
+    if((tmpreg & DMAy_FLAG) != (uint32_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      DMA_ClearFlag
+ *
+ * @brief   Clears the DMAy Channelx's pending flags.
+ *
+ * @param   DMAy_FLAG - specifies the flag to check.
+ *            DMA1_FLAG_GL1 - DMA1 Channel1 global flag.
+ *            DMA1_FLAG_TC1 - DMA1 Channel1 transfer complete flag.
+ *            DMA1_FLAG_HT1 - DMA1 Channel1 half transfer flag.
+ *            DMA1_FLAG_TE1 - DMA1 Channel1 transfer error flag.
+ *            DMA1_FLAG_GL2 - DMA1 Channel2 global flag.
+ *            DMA1_FLAG_TC2 - DMA1 Channel2 transfer complete flag.
+ *            DMA1_FLAG_HT2 - DMA1 Channel2 half transfer flag.
+ *            DMA1_FLAG_TE2 - DMA1 Channel2 transfer error flag.
+ *            DMA1_FLAG_GL3 - DMA1 Channel3 global flag.
+ *            DMA1_FLAG_TC3 - DMA1 Channel3 transfer complete flag.
+ *            DMA1_FLAG_HT3 - DMA1 Channel3 half transfer flag.
+ *            DMA1_FLAG_TE3 - DMA1 Channel3 transfer error flag.
+ *            DMA1_FLAG_GL4 - DMA1 Channel4 global flag.
+ *            DMA1_FLAG_TC4 - DMA1 Channel4 transfer complete flag.
+ *            DMA1_FLAG_HT4 - DMA1 Channel4 half transfer flag.
+ *            DMA1_FLAG_TE4 - DMA1 Channel4 transfer error flag.
+ *            DMA1_FLAG_GL5 - DMA1 Channel5 global flag.
+ *            DMA1_FLAG_TC5 - DMA1 Channel5 transfer complete flag.
+ *            DMA1_FLAG_HT5 - DMA1 Channel5 half transfer flag.
+ *            DMA1_FLAG_TE5 - DMA1 Channel5 transfer error flag.
+ *            DMA1_FLAG_GL6 - DMA1 Channel6 global flag.
+ *            DMA1_FLAG_TC6 - DMA1 Channel6 transfer complete flag.
+ *            DMA1_FLAG_HT6 - DMA1 Channel6 half transfer flag.
+ *            DMA1_FLAG_TE6 - DMA1 Channel6 transfer error flag.
+ *            DMA1_FLAG_GL7 - DMA1 Channel7 global flag.
+ *            DMA1_FLAG_TC7 - DMA1 Channel7 transfer complete flag.
+ *            DMA1_FLAG_HT7 - DMA1 Channel7 half transfer flag.
+ *            DMA1_FLAG_TE7 - DMA1 Channel7 transfer error flag.
+ *            DMA2_FLAG_GL1 - DMA2 Channel1 global flag.
+ *            DMA2_FLAG_TC1 - DMA2 Channel1 transfer complete flag.
+ *            DMA2_FLAG_HT1 - DMA2 Channel1 half transfer flag.
+ *            DMA2_FLAG_TE1 - DMA2 Channel1 transfer error flag.
+ * @return  none
+ */
+void DMA_ClearFlag(uint32_t DMAy_FLAG)
+{
+    DMA1->INTFCR = DMAy_FLAG;
+}
+
+/*********************************************************************
+ * @fn      DMA_GetITStatus
+ *
+ * @brief   Checks whether the specified DMAy Channelx interrupt has
+ *        occurred or not.
+ *
+ * @param   DMAy_IT - specifies the DMAy interrupt source to check.
+ *            DMA1_IT_GL1 - DMA1 Channel1 global flag.
+ *            DMA1_IT_TC1 - DMA1 Channel1 transfer complete flag.
+ *            DMA1_IT_HT1 - DMA1 Channel1 half transfer flag.
+ *            DMA1_IT_TE1 - DMA1 Channel1 transfer error flag.
+ *            DMA1_IT_GL2 - DMA1 Channel2 global flag.
+ *            DMA1_IT_TC2 - DMA1 Channel2 transfer complete flag.
+ *            DMA1_IT_HT2 - DMA1 Channel2 half transfer flag.
+ *            DMA1_IT_TE2 - DMA1 Channel2 transfer error flag.
+ *            DMA1_IT_GL3 - DMA1 Channel3 global flag.
+ *            DMA1_IT_TC3 - DMA1 Channel3 transfer complete flag.
+ *            DMA1_IT_HT3 - DMA1 Channel3 half transfer flag.
+ *            DMA1_IT_TE3 - DMA1 Channel3 transfer error flag.
+ *            DMA1_IT_GL4 - DMA1 Channel4 global flag.
+ *            DMA1_IT_TC4 - DMA1 Channel4 transfer complete flag.
+ *            DMA1_IT_HT4 - DMA1 Channel4 half transfer flag.
+ *            DMA1_IT_TE4 - DMA1 Channel4 transfer error flag.
+ *            DMA1_IT_GL5 - DMA1 Channel5 global flag.
+ *            DMA1_IT_TC5 - DMA1 Channel5 transfer complete flag.
+ *            DMA1_IT_HT5 - DMA1 Channel5 half transfer flag.
+ *            DMA1_IT_TE5 - DMA1 Channel5 transfer error flag.
+ *            DMA1_IT_GL6 - DMA1 Channel6 global flag.
+ *            DMA1_IT_TC6 - DMA1 Channel6 transfer complete flag.
+ *            DMA1_IT_HT6 - DMA1 Channel6 half transfer flag.
+ *            DMA1_IT_TE6 - DMA1 Channel6 transfer error flag.
+ *            DMA1_IT_GL7 - DMA1 Channel7 global flag.
+ *            DMA1_IT_TC7 - DMA1 Channel7 transfer complete flag.
+ *            DMA1_IT_HT7 - DMA1 Channel7 half transfer flag.
+ *            DMA1_IT_TE7 - DMA1 Channel7 transfer error flag.
+ *            DMA2_IT_GL1 - DMA2 Channel1 global flag.
+ *            DMA2_IT_TC1 - DMA2 Channel1 transfer complete flag.
+ *            DMA2_IT_HT1 - DMA2 Channel1 half transfer flag.
+ *            DMA2_IT_TE1 - DMA2 Channel1 transfer error flag.
+ * @return  The new state of DMAy_IT (SET or RESET).
+ */
+ITStatus DMA_GetITStatus(uint32_t DMAy_IT)
+{
+    ITStatus bitstatus = RESET;
+    uint32_t tmpreg = 0;
+
+    tmpreg = DMA1->INTFR;
+
+    if((tmpreg & DMAy_IT) != (uint32_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      DMA_ClearITPendingBit
+ *
+ * @brief   Clears the DMAy Channelx's interrupt pending bits.
+ *
+ * @param   DMAy_IT - specifies the DMAy interrupt source to check.
+ *            DMA1_IT_GL1 - DMA1 Channel1 global flag.
+ *            DMA1_IT_TC1 - DMA1 Channel1 transfer complete flag.
+ *            DMA1_IT_HT1 - DMA1 Channel1 half transfer flag.
+ *            DMA1_IT_TE1 - DMA1 Channel1 transfer error flag.
+ *            DMA1_IT_GL2 - DMA1 Channel2 global flag.
+ *            DMA1_IT_TC2 - DMA1 Channel2 transfer complete flag.
+ *            DMA1_IT_HT2 - DMA1 Channel2 half transfer flag.
+ *            DMA1_IT_TE2 - DMA1 Channel2 transfer error flag.
+ *            DMA1_IT_GL3 - DMA1 Channel3 global flag.
+ *            DMA1_IT_TC3 - DMA1 Channel3 transfer complete flag.
+ *            DMA1_IT_HT3 - DMA1 Channel3 half transfer flag.
+ *            DMA1_IT_TE3 - DMA1 Channel3 transfer error flag.
+ *            DMA1_IT_GL4 - DMA1 Channel4 global flag.
+ *            DMA1_IT_TC4 - DMA1 Channel4 transfer complete flag.
+ *            DMA1_IT_HT4 - DMA1 Channel4 half transfer flag.
+ *            DMA1_IT_TE4 - DMA1 Channel4 transfer error flag.
+ *            DMA1_IT_GL5 - DMA1 Channel5 global flag.
+ *            DMA1_IT_TC5 - DMA1 Channel5 transfer complete flag.
+ *            DMA1_IT_HT5 - DMA1 Channel5 half transfer flag.
+ *            DMA1_IT_TE5 - DMA1 Channel5 transfer error flag.
+ *            DMA1_IT_GL6 - DMA1 Channel6 global flag.
+ *            DMA1_IT_TC6 - DMA1 Channel6 transfer complete flag.
+ *            DMA1_IT_HT6 - DMA1 Channel6 half transfer flag.
+ *            DMA1_IT_TE6 - DMA1 Channel6 transfer error flag.
+ *            DMA1_IT_GL7 - DMA1 Channel7 global flag.
+ *            DMA1_IT_TC7 - DMA1 Channel7 transfer complete flag.
+ *            DMA1_IT_HT7 - DMA1 Channel7 half transfer flag.
+ *            DMA1_IT_TE7 - DMA1 Channel7 transfer error flag.
+ *            DMA2_IT_GL1 - DMA2 Channel1 global flag.
+ *            DMA2_IT_TC1 - DMA2 Channel1 transfer complete flag.
+ *            DMA2_IT_HT1 - DMA2 Channel1 half transfer flag.
+ *            DMA2_IT_TE1 - DMA2 Channel1 transfer error flag.
+ * @return  none
+ */
+void DMA_ClearITPendingBit(uint32_t DMAy_IT)
+{
+    DMA1->INTFCR = DMAy_IT;
+}

src/peripheral/src/ch32v20x_exti.c

@@ -0,0 +1,182 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_exti.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the EXTI firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_exti.h"
+
+/* No interrupt selected */
+#define EXTI_LINENONE    ((uint32_t)0x00000)
+
+/*********************************************************************
+ * @fn      EXTI_DeInit
+ *
+ * @brief   Deinitializes the EXTI peripheral registers to their default
+ *        reset values.
+ *
+ * @return  none.
+ */
+void EXTI_DeInit(void)
+{
+    EXTI->INTENR = 0x00000000;
+    EXTI->EVENR = 0x00000000;
+    EXTI->RTENR = 0x00000000;
+    EXTI->FTENR = 0x00000000;
+    EXTI->INTFR = 0x000FFFFF;
+}
+
+/*********************************************************************
+ * @fn      EXTI_Init
+ *
+ * @brief   Initializes the EXTI peripheral according to the specified
+ *        parameters in the EXTI_InitStruct.
+ *
+ * @param   EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
+ *
+ * @return  none.
+ */
+void EXTI_Init(EXTI_InitTypeDef *EXTI_InitStruct)
+{
+    uint32_t tmp = 0;
+
+    tmp = (uint32_t)EXTI_BASE;
+    if(EXTI_InitStruct->EXTI_LineCmd != DISABLE)
+    {
+        EXTI->INTENR &= ~EXTI_InitStruct->EXTI_Line;
+        EXTI->EVENR &= ~EXTI_InitStruct->EXTI_Line;
+        tmp += EXTI_InitStruct->EXTI_Mode;
+        *(__IO uint32_t *)tmp |= EXTI_InitStruct->EXTI_Line;
+        EXTI->RTENR &= ~EXTI_InitStruct->EXTI_Line;
+        EXTI->FTENR &= ~EXTI_InitStruct->EXTI_Line;
+        if(EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
+        {
+            EXTI->RTENR |= EXTI_InitStruct->EXTI_Line;
+            EXTI->FTENR |= EXTI_InitStruct->EXTI_Line;
+        }
+        else
+        {
+            tmp = (uint32_t)EXTI_BASE;
+            tmp += EXTI_InitStruct->EXTI_Trigger;
+            *(__IO uint32_t *)tmp |= EXTI_InitStruct->EXTI_Line;
+        }
+    }
+    else
+    {
+        tmp += EXTI_InitStruct->EXTI_Mode;
+        *(__IO uint32_t *)tmp &= ~EXTI_InitStruct->EXTI_Line;
+    }
+}
+
+/*********************************************************************
+ * @fn      EXTI_StructInit
+ *
+ * @brief   Fills each EXTI_InitStruct member with its reset value.
+ *
+ * @param   EXTI_InitStruct - pointer to a EXTI_InitTypeDef structure
+ *
+ * @return  none.
+ */
+void EXTI_StructInit(EXTI_InitTypeDef *EXTI_InitStruct)
+{
+    EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
+    EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
+    EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
+    EXTI_InitStruct->EXTI_LineCmd = DISABLE;
+}
+
+/*********************************************************************
+ * @fn      EXTI_GenerateSWInterrupt
+ *
+ * @brief   Generates a Software interrupt.
+ *
+ * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
+ *
+ * @return  none.
+ */
+void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
+{
+    EXTI->SWIEVR |= EXTI_Line;
+}
+
+/*********************************************************************
+ * @fn      EXTI_GetFlagStatus
+ *
+ * @brief   Checks whether the specified EXTI line flag is set or not.
+ *
+ * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
+ *
+ * @return  The new state of EXTI_Line (SET or RESET).
+ */
+FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
+{
+    FlagStatus bitstatus = RESET;
+    if((EXTI->INTFR & EXTI_Line) != (uint32_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      EXTI_ClearFlag
+ *
+ * @brief   Clears the EXTI's line pending flags.
+ *
+ * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
+ *
+ * @return  None
+ */
+void EXTI_ClearFlag(uint32_t EXTI_Line)
+{
+    EXTI->INTFR = EXTI_Line;
+}
+
+/*********************************************************************
+ * @fn      EXTI_GetITStatus
+ *
+ * @brief   Checks whether the specified EXTI line is asserted or not.
+ *
+ * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
+ *
+ * @return  The new state of EXTI_Line (SET or RESET).
+ */
+ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
+{
+    ITStatus bitstatus = RESET;
+    uint32_t enablestatus = 0;
+
+    enablestatus = EXTI->INTENR & EXTI_Line;
+    if(((EXTI->INTFR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      EXTI_ClearITPendingBit
+ *
+ * @brief   Clears the EXTI's line pending bits.
+ *
+ * @param   EXTI_Line - specifies the EXTI lines to be enabled or disabled.
+ *
+ * @return  none
+ */
+void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
+{
+    EXTI->INTFR = EXTI_Line;
+}

src/peripheral/src/ch32v20x_gpio.c

@@ -0,0 +1,999 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_gpio.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/05/06
+ * Description        : This file provides all the GPIO firmware functions.
+ *********************************************************************************
+ * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+ * Attention: This software (modified or not) and binary are used for 
+ * microcontroller manufactured by Nanjing Qinheng Microelectronics.
+ *******************************************************************************/
+#include "ch32v20x_gpio.h"
+#include "ch32v20x_rcc.h"
+
+/* MASK */
+#define ECR_PORTPINCONFIG_MASK    ((uint16_t)0xFF80)
+#define LSB_MASK                  ((uint16_t)0xFFFF)
+#define DBGAFR_POSITION_MASK      ((uint32_t)0x000F0000)
+#define DBGAFR_SWJCFG_MASK        ((uint32_t)0xF0FFFFFF)
+#define DBGAFR_LOCATION_MASK      ((uint32_t)0x00200000)
+#define DBGAFR_NUMBITS_MASK       ((uint32_t)0x00100000)
+
+#if defined (CH32V20x_D6)
+uint8_t MCU_Version = 0;
+#endif
+
+/*********************************************************************
+ * @fn      GPIO_DeInit
+ *
+ * @brief   Deinitializes the GPIOx peripheral registers to their default
+ *        reset values.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *
+ * @return  none
+ */
+void GPIO_DeInit(GPIO_TypeDef *GPIOx)
+{
+    if(GPIOx == GPIOA)
+    {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, DISABLE);
+    }
+    else if(GPIOx == GPIOB)
+    {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, DISABLE);
+    }
+    else if(GPIOx == GPIOC)
+    {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOC, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOC, DISABLE);
+    }
+    else if(GPIOx == GPIOD)
+    {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOD, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOD, DISABLE);
+    }
+    else if(GPIOx == GPIOE)
+    {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOE, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOE, DISABLE);
+    }
+}
+
+/*********************************************************************
+ * @fn      GPIO_AFIODeInit
+ *
+ * @brief   Deinitializes the Alternate Functions (remap, event control
+ *        and EXTI configuration) registers to their default reset values.
+ *
+ * @return  none
+ */
+void GPIO_AFIODeInit(void)
+{
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_AFIO, ENABLE);
+    RCC_APB2PeriphResetCmd(RCC_APB2Periph_AFIO, DISABLE);
+}
+
+/*********************************************************************
+ * @fn      GPIO_Init
+ *
+ * @brief   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *
+ * @param   GPIO_InitStruct - pointer to a GPIO_InitTypeDef structure that
+ *        contains the configuration information for the specified GPIO peripheral.
+ *
+ * @return  none
+ */
+void GPIO_Init(GPIO_TypeDef *GPIOx, GPIO_InitTypeDef *GPIO_InitStruct)
+{
+    uint32_t currentmode = 0x00, currentpin = 0x00, pinpos = 0x00, pos = 0x00;
+    uint32_t tmpreg = 0x00, pinmask = 0x00;
+
+    currentmode = ((uint32_t)GPIO_InitStruct->GPIO_Mode) & ((uint32_t)0x0F);
+
+    if((((uint32_t)GPIO_InitStruct->GPIO_Mode) & ((uint32_t)0x10)) != 0x00)
+    {
+        currentmode |= (uint32_t)GPIO_InitStruct->GPIO_Speed;
+    }
+#if defined (CH32V20x_D6)
+    if(((*(uint32_t *) 0x40022030) & 0x0F000000) == 0)
+    {
+        MCU_Version = 1;
+    }
+
+    if((GPIOx == GPIOC) && MCU_Version){
+        GPIO_InitStruct->GPIO_Pin = GPIO_InitStruct->GPIO_Pin >> 13;
+    }
+
+#endif
+    if(((uint32_t)GPIO_InitStruct->GPIO_Pin & ((uint32_t)0x00FF)) != 0x00)
+    {
+        tmpreg = GPIOx->CFGLR;
+
+        for(pinpos = 0x00; pinpos < 0x08; pinpos++)
+        {
+            pos = ((uint32_t)0x01) << pinpos;
+            currentpin = (GPIO_InitStruct->GPIO_Pin) & pos;
+
+            if(currentpin == pos)
+            {
+                pos = pinpos << 2;
+                pinmask = ((uint32_t)0x0F) << pos;
+                tmpreg &= ~pinmask;
+                tmpreg |= (currentmode << pos);
+
+                if(GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPD)
+                {
+                    GPIOx->BCR = (((uint32_t)0x01) << pinpos);
+                }
+                else
+                {
+                    if(GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
+                    {
+                        GPIOx->BSHR = (((uint32_t)0x01) << pinpos);
+                    }
+                }
+            }
+        }
+        GPIOx->CFGLR = tmpreg;
+    }
+
+    if(GPIO_InitStruct->GPIO_Pin > 0x00FF)
+    {
+        tmpreg = GPIOx->CFGHR;
+
+        for(pinpos = 0x00; pinpos < 0x08; pinpos++)
+        {
+            pos = (((uint32_t)0x01) << (pinpos + 0x08));
+            currentpin = ((GPIO_InitStruct->GPIO_Pin) & pos);
+
+            if(currentpin == pos)
+            {
+                pos = pinpos << 2;
+                pinmask = ((uint32_t)0x0F) << pos;
+                tmpreg &= ~pinmask;
+                tmpreg |= (currentmode << pos);
+
+                if(GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPD)
+                {
+                    GPIOx->BCR = (((uint32_t)0x01) << (pinpos + 0x08));
+                }
+
+                if(GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
+                {
+                    GPIOx->BSHR = (((uint32_t)0x01) << (pinpos + 0x08));
+                }
+            }
+        }
+        GPIOx->CFGHR = tmpreg;
+    }
+}
+
+/*********************************************************************
+ * @fn      GPIO_StructInit
+ *
+ * @brief   Fills each GPIO_InitStruct member with its default
+ *
+ * @param   GPIO_InitStruct - pointer to a GPIO_InitTypeDef structure
+ *      which will be initialized.
+ *
+ * @return  none
+ */
+void GPIO_StructInit(GPIO_InitTypeDef *GPIO_InitStruct)
+{
+    GPIO_InitStruct->GPIO_Pin = GPIO_Pin_All;
+    GPIO_InitStruct->GPIO_Speed = GPIO_Speed_2MHz;
+    GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IN_FLOATING;
+}
+
+/*********************************************************************
+ * @fn      GPIO_ReadInputDataBit
+ *
+ * @brief   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *
+ * @param    GPIO_Pin - specifies the port bit to read.
+ *             This parameter can be GPIO_Pin_x where x can be (0..15).
+ *
+ * @return  The input port pin value.
+ */
+uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin)
+{
+    uint8_t bitstatus = 0x00;
+
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        GPIO_Pin = GPIO_Pin >> 13;
+    }
+
+#endif
+
+    if((GPIOx->INDR & GPIO_Pin) != (uint32_t)Bit_RESET)
+    {
+        bitstatus = (uint8_t)Bit_SET;
+    }
+    else
+    {
+        bitstatus = (uint8_t)Bit_RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      GPIO_ReadInputData
+ *
+ * @brief   Reads the specified GPIO input data port.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *
+ * @return  The output port pin value.
+ */
+uint16_t GPIO_ReadInputData(GPIO_TypeDef *GPIOx)
+{
+    uint16_t val;
+
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        val = ( uint16_t )(GPIOx->INDR << 13);
+    }
+    else{
+        val = ( uint16_t )GPIOx->INDR;
+    }
+
+#else
+    val = ( uint16_t )GPIOx->INDR;
+#endif
+
+return ( val );
+}
+
+/*********************************************************************
+ * @fn      GPIO_ReadOutputDataBit
+ *
+ * @brief   Reads the specified output data port bit.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *          GPIO_Pin - specifies the port bit to read.
+ *            This parameter can be GPIO_Pin_x where x can be (0..15).
+ *
+ * @return  none
+ */
+uint8_t GPIO_ReadOutputDataBit(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin)
+{
+    uint8_t bitstatus = 0x00;
+
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        GPIO_Pin = GPIO_Pin >> 13;
+    }
+
+#endif
+
+    if((GPIOx->OUTDR & GPIO_Pin) != (uint32_t)Bit_RESET)
+    {
+        bitstatus = (uint8_t)Bit_SET;
+    }
+    else
+    {
+        bitstatus = (uint8_t)Bit_RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      GPIO_ReadOutputData
+ *
+ * @brief   Reads the specified GPIO output data port.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *
+ * @return  GPIO output port pin value.
+ */
+uint16_t GPIO_ReadOutputData(GPIO_TypeDef *GPIOx)
+{
+    uint16_t val;
+
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        val = ( uint16_t )(GPIOx->OUTDR << 13);
+    }
+    else{
+        val = ( uint16_t )GPIOx->OUTDR;
+    }
+
+#else
+    val = ( uint16_t )GPIOx->OUTDR;
+#endif
+
+    return ( val );
+}
+
+/*********************************************************************
+ * @fn      GPIO_SetBits
+ *
+ * @brief   Sets the selected data port bits.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *          GPIO_Pin - specifies the port bits to be written.
+ *            This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
+ *
+ * @return  none
+ */
+void GPIO_SetBits(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin)
+{
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        GPIO_Pin = GPIO_Pin >> 13;
+    }
+
+#endif
+
+    GPIOx->BSHR = GPIO_Pin;
+}
+
+/*********************************************************************
+ * @fn      GPIO_ResetBits
+ *
+ * @brief   Clears the selected data port bits.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *          GPIO_Pin - specifies the port bits to be written.
+ *            This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
+ *
+ * @return  none
+ */
+void GPIO_ResetBits(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin)
+{
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        GPIO_Pin = GPIO_Pin >> 13;
+    }
+
+#endif
+
+    GPIOx->BCR = GPIO_Pin;
+}
+
+/*********************************************************************
+ * @fn      GPIO_WriteBit
+ *
+ * @brief   Sets or clears the selected data port bit.
+ *
+ * @param   GPIO_Pin - specifies the port bit to be written.
+ *            This parameter can be one of GPIO_Pin_x where x can be (0..15).
+ *          BitVal - specifies the value to be written to the selected bit.
+ *            Bit_RESET - to clear the port pin.
+ *            Bit_SET - to set the port pin.
+ *
+ * @return  none
+ */
+void GPIO_WriteBit(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin, BitAction BitVal)
+{
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        GPIO_Pin = GPIO_Pin >> 13;
+    }
+
+#endif
+
+    if(BitVal != Bit_RESET)
+    {
+        GPIOx->BSHR = GPIO_Pin;
+    }
+    else
+    {
+        GPIOx->BCR = GPIO_Pin;
+    }
+}
+
+/*********************************************************************
+ * @fn      GPIO_Write
+ *
+ * @brief   Writes data to the specified GPIO data port.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *          PortVal - specifies the value to be written to the port output data register.
+ *
+ * @return  none
+ */
+void GPIO_Write(GPIO_TypeDef *GPIOx, uint16_t PortVal)
+{
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        PortVal = PortVal >> 13;
+    }
+
+#endif
+
+    GPIOx->OUTDR = PortVal;
+}
+
+/*********************************************************************
+ * @fn      GPIO_PinLockConfig
+ *
+ * @brief   Locks GPIO Pins configuration registers.
+ *
+ * @param   GPIOx - where x can be (A..G) to select the GPIO peripheral.
+ *          GPIO_Pin - specifies the port bit to be written.
+ *            This parameter can be any combination of GPIO_Pin_x where x can be (0..15).
+ *
+ * @return  none
+ */
+void GPIO_PinLockConfig(GPIO_TypeDef *GPIOx, uint16_t GPIO_Pin)
+{
+    uint32_t tmp = 0x00010000;
+
+#if defined (CH32V20x_D6)
+    if((GPIOx == GPIOC) && MCU_Version){
+        GPIO_Pin = GPIO_Pin >> 13;
+    }
+
+#endif
+
+    tmp |= GPIO_Pin;
+    GPIOx->LCKR = tmp;
+    GPIOx->LCKR = GPIO_Pin;
+    GPIOx->LCKR = tmp;
+    tmp = GPIOx->LCKR;
+    tmp = GPIOx->LCKR;
+}
+
+/*********************************************************************
+ * @fn      GPIO_EventOutputConfig
+ *
+ * @brief   Selects the GPIO pin used as Event output.
+ *
+ * @param   GPIO_PortSource - selects the GPIO port to be used as source
+ *        for Event output.
+ *            This parameter can be GPIO_PortSourceGPIOx where x can be (A..E).
+ *          GPIO_PinSource - specifies the pin for the Event output.
+ *            This parameter can be GPIO_PinSourcex where x can be (0..15).
+ *
+ * @return  none
+ */
+void GPIO_EventOutputConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource)
+{
+    uint32_t tmpreg = 0x00;
+
+    tmpreg = AFIO->ECR;
+    tmpreg &= ECR_PORTPINCONFIG_MASK;
+    tmpreg |= (uint32_t)GPIO_PortSource << 0x04;
+    tmpreg |= GPIO_PinSource;
+    AFIO->ECR = tmpreg;
+}
+
+/*********************************************************************
+ * @fn      GPIO_EventOutputCmd
+ *
+ * @brief   Enables or disables the Event Output.
+ *
+ * @param   NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void GPIO_EventOutputCmd(FunctionalState NewState)
+{
+    if(NewState)
+    {
+        AFIO->ECR |= (1 << 7);
+    }
+    else
+    {
+        AFIO->ECR &= ~(1 << 7);
+    }
+}
+
+/*********************************************************************
+ * @fn      GPIO_PinRemapConfig
+ *
+ * @brief   Changes the mapping of the specified pin.
+ *
+ * @param   GPIO_Remap - selects the pin to remap.
+ *            GPIO_Remap_SPI1 - SPI1 Alternate Function mapping
+ *            GPIO_Remap_I2C1 - I2C1 Alternate Function mapping
+ *            GPIO_Remap_USART1 - USART1 Alternate Function mapping
+ *            GPIO_Remap_USART2 - USART2 Alternate Function mapping
+ *            GPIO_PartialRemap_USART3 - USART3 Partial Alternate Function mapping
+ *            GPIO_FullRemap_USART3 - USART3 Full Alternate Function mapping
+ *            GPIO_PartialRemap_TIM1 - TIM1 Partial Alternate Function mapping
+ *            GPIO_FullRemap_TIM1 - TIM1 Full Alternate Function mapping
+ *            GPIO_PartialRemap1_TIM2 - TIM2 Partial1 Alternate Function mapping
+ *            GPIO_PartialRemap2_TIM2 - TIM2 Partial2 Alternate Function mapping
+ *            GPIO_FullRemap_TIM2 - TIM2 Full Alternate Function mapping
+ *            GPIO_PartialRemap_TIM3 - TIM3 Partial Alternate Function mapping
+ *            GPIO_FullRemap_TIM3 - TIM3 Full Alternate Function mapping
+ *            GPIO_Remap_TIM4 - TIM4 Alternate Function mapping
+ *            GPIO_Remap1_CAN1 - CAN1 Alternate Function mapping
+ *            GPIO_Remap2_CAN1 - CAN1 Alternate Function mapping
+ *            GPIO_Remap_PD0PD1 - PD0 and PD1 Alternate Function mapping
+ *            GPIO_Remap_ADC1_ETRGINJ - ADC1 External Trigger Injected Conversion remapping
+ *            GPIO_Remap_ADC1_ETRGREG - ADC1 External Trigger Regular Conversion remapping
+ *            GPIO_Remap_ADC2_ETRGINJ - ADC2 External Trigger Injected Conversion remapping
+ *            GPIO_Remap_ADC2_ETRGREG - ADC2 External Trigger Regular Conversion remapping
+ *            GPIO_Remap_ETH - Ethernet remapping
+ *            GPIO_Remap_CAN2 - CAN2 remapping
+ *            GPIO_Remap_MII_RMII_SEL - MII or RMII selection
+ *            GPIO_Remap_SWJ_Disable - Full SWJ Disabled 
+ *            GPIO_Remap_TIM2ITR1_PTP_SOF - Ethernet PTP output or USB OTG SOF (Start of Frame) connected
+ *        to TIM2 Internal Trigger 1 for calibration
+ *            GPIO_Remap_TIM2ITR1_PTP_SOF - Ethernet PTP output or USB OTG SOF (Start of Frame)
+ *            GPIO_Remap_TIM8 - TIM8 Alternate Function mapping
+ *            GPIO_PartialRemap_TIM9 - TIM9 Partial Alternate Function mapping
+ *            GPIO_FullRemap_TIM9 - TIM9 Full Alternate Function mapping
+ *            GPIO_PartialRemap_TIM10 - TIM10 Partial Alternate Function mapping
+ *            GPIO_FullRemap_TIM10 - TIM10 Full Alternate Function mapping
+ *            GPIO_Remap_FSMC_NADV - FSMC_NADV Alternate Function mapping
+ *            GPIO_PartialRemap_USART4 - USART4 Partial Alternate Function mapping
+ *            GPIO_FullRemap_USART4 - USART4 Full Alternate Function mapping
+ *            GPIO_PartialRemap_USART5 - USART5 Partial Alternate Function mapping
+ *            GPIO_FullRemap_USART5 - USART5 Full Alternate Function mapping
+ *            GPIO_PartialRemap_USART6 - USART6 Partial Alternate Function mapping
+ *            GPIO_FullRemap_USART6 - USART6 Full Alternate Function mapping
+ *            GPIO_PartialRemap_USART7 - USART7 Partial Alternate Function mapping
+ *            GPIO_FullRemap_USART7 - USART7 Full Alternate Function mapping
+ *            GPIO_PartialRemap_USART8 - USART8 Partial Alternate Function mapping
+ *            GPIO_FullRemap_USART8 - USART8 Full Alternate Function mapping
+ *            GPIO_Remap_USART1_HighBit - USART1 Alternate Function mapping high bit
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void GPIO_PinRemapConfig(uint32_t GPIO_Remap, FunctionalState NewState)
+{
+    uint32_t tmp = 0x00, tmp1 = 0x00, tmpreg = 0x00, tmpmask = 0x00;
+
+    if((GPIO_Remap & 0x80000000) == 0x80000000)
+    {
+        tmpreg = AFIO->PCFR2;
+    }
+    else
+    {
+        tmpreg = AFIO->PCFR1;
+
+    if(((*(uint32_t *) 0x40022030) & 0x0F000000) == 0){
+        tmpreg = ((tmpreg>>1)&0xFFFFE000)|(tmpreg&0x00001FFF);
+    }
+
+    }
+
+    tmpmask = (GPIO_Remap & DBGAFR_POSITION_MASK) >> 0x10;
+    tmp = GPIO_Remap & LSB_MASK;
+
+    /* Clear bit */
+    if((GPIO_Remap & 0x80000000) == 0x80000000)
+    {                                                                                                                   /* PCFR2 */
+        if((GPIO_Remap & (DBGAFR_LOCATION_MASK | DBGAFR_NUMBITS_MASK)) == (DBGAFR_LOCATION_MASK | DBGAFR_NUMBITS_MASK)) /* [31:16] 2bit */
+        {
+            tmp1 = ((uint32_t)0x03) << (tmpmask + 0x10);
+            tmpreg &= ~tmp1;
+        }
+        else if((GPIO_Remap & DBGAFR_NUMBITS_MASK) == DBGAFR_NUMBITS_MASK) /* [15:0] 2bit */
+        {
+            tmp1 = ((uint32_t)0x03) << tmpmask;
+            tmpreg &= ~tmp1;
+        }
+        else /* [31:0] 1bit */
+        {
+            tmpreg &= ~(tmp << (((GPIO_Remap & 0x7FFFFFFF ) >> 0x15) * 0x10));
+        }
+    }
+    else
+    {                                                                                                                   /* PCFR1 */
+        if((GPIO_Remap & (DBGAFR_LOCATION_MASK | DBGAFR_NUMBITS_MASK)) == (DBGAFR_LOCATION_MASK | DBGAFR_NUMBITS_MASK)) /* [26:24] 3bit SWD_JTAG */
+        {
+            tmpreg &= DBGAFR_SWJCFG_MASK;
+            AFIO->PCFR1 &= DBGAFR_SWJCFG_MASK;
+        }
+        else if((GPIO_Remap & DBGAFR_NUMBITS_MASK) == DBGAFR_NUMBITS_MASK) /* [15:0] 2bit */
+        {
+            tmp1 = ((uint32_t)0x03) << tmpmask;
+            tmpreg &= ~tmp1;
+            tmpreg |= ~DBGAFR_SWJCFG_MASK;
+        }
+        else /* [31:0] 1bit */
+        {
+            tmpreg &= ~(tmp << ((GPIO_Remap >> 0x15) * 0x10));
+            tmpreg |= ~DBGAFR_SWJCFG_MASK;
+        }
+    }
+
+    /* Set bit */
+    if(NewState != DISABLE)
+    {
+        tmpreg |= (tmp << (((GPIO_Remap & 0x7FFFFFFF )>> 0x15) * 0x10));
+    }
+
+    if((GPIO_Remap & 0x80000000) == 0x80000000)
+    {
+        AFIO->PCFR2 = tmpreg;
+    }
+    else
+    {
+        AFIO->PCFR1 = tmpreg;
+    }
+}
+
+/*********************************************************************
+ * @fn      GPIO_EXTILineConfig
+ *
+ * @brief   Selects the GPIO pin used as EXTI Line.
+ *
+ * @param   GPIO_PortSource - selects the GPIO port to be used as source for EXTI lines.
+ *            This parameter can be GPIO_PortSourceGPIOx where x can be (A..G).
+ *          GPIO_PinSource - specifies the EXTI line to be configured.
+ *            This parameter can be GPIO_PinSourcex where x can be (0..15).
+ *
+ * @return  none
+ */
+void GPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource)
+{
+    uint32_t tmp = 0x00;
+
+    tmp = ((uint32_t)0x0F) << (0x04 * (GPIO_PinSource & (uint8_t)0x03));
+    AFIO->EXTICR[GPIO_PinSource >> 0x02] &= ~tmp;
+    AFIO->EXTICR[GPIO_PinSource >> 0x02] |= (((uint32_t)GPIO_PortSource) << (0x04 * (GPIO_PinSource & (uint8_t)0x03)));
+}
+
+/*********************************************************************
+ * @fn      GPIO_ETH_MediaInterfaceConfig
+ *
+ * @brief   Selects the Ethernet media interface.
+ *
+ * @param   GPIO_ETH_MediaInterface - specifies the Media Interface mode.
+ *            GPIO_ETH_MediaInterface_MII - MII mode
+ *            GPIO_ETH_MediaInterface_RMII - RMII mode
+ *
+ * @return  none
+ */
+void GPIO_ETH_MediaInterfaceConfig(uint32_t GPIO_ETH_MediaInterface)
+{
+    if(GPIO_ETH_MediaInterface)
+    {
+        AFIO->PCFR1 |= (1 << 23);
+    }
+    else
+    {
+        AFIO->PCFR1 &= ~(1 << 23);
+    }
+}
+
+/*********************************************************************
+ * @fn      GPIO_IPD_Unused
+ *
+ * @brief   Configure unused GPIO as input pull-up.
+ *
+ * @param   none
+ *
+ * @return  none
+ */
+void GPIO_IPD_Unused(void)
+{
+    GPIO_InitTypeDef GPIO_InitStructure = {0};
+    uint32_t chip = 0;
+    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB \
+                          | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD|RCC_APB2Periph_AFIO,ENABLE);
+    chip =  *( uint32_t * )0x1FFFF704 & (~0x000000F0);
+    switch(chip)
+    {
+#ifdef CH32V20x_D6
+        case 0x20370500:     //CH32V203F6P6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOA, &GPIO_InitStructure);
+             GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0\
+                                          |GPIO_Pin_3|GPIO_Pin_4\
+                                          |GPIO_Pin_5|GPIO_Pin_6\
+                                          |GPIO_Pin_7|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x203A0500:     //CH32V203F8P6
+        {
+            GPIO_PinRemapConfig(GPIO_Remap_PD01, ENABLE);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_12\
+                                          |GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOA, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1\
+                                          |GPIO_Pin_3|GPIO_Pin_4\
+                                          |GPIO_Pin_5|GPIO_Pin_8\
+                                          |GPIO_Pin_9|GPIO_Pin_10\
+                                          |GPIO_Pin_11|GPIO_Pin_12;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x203E0500:     //CH32V203F8U6
+        {
+            GPIO_PinRemapConfig(GPIO_Remap_PD01, ENABLE);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOA, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_12|GPIO_Pin_13;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x20360500:     //CH32V203G6U6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOA, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x203B0500:     //CH32V203G8R6
+        {
+             GPIO_PinRemapConfig(GPIO_Remap_PD01, ENABLE);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOA, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_9;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x20320500:     //CH32V203K8T6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13\
+                                          |GPIO_Pin_14|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x20330500:     //CH32V203C6T6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x20310500:     //CH32V203C8T6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+          case 0x20300500:     //CH32V203C8U6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+#elif defined(CH32V20x_D8)
+        case 0x2034050C:     //CH32V203RBT6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4\
+                                          |GPIO_Pin_5|GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+#elif defined(CH32V20x_D8W)
+        case 0x2083050C:     //CH32V208GBU6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOA, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_9|GPIO_Pin_10\
+                                          |GPIO_Pin_11|GPIO_Pin_12\
+                                          |GPIO_Pin_13|GPIO_Pin_14\
+                                          |GPIO_Pin_15;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOB, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12|GPIO_Pin_13;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x2082050C:     //CH32V208CBU6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1\
+                                          |GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6|GPIO_Pin_7\
+                                          |GPIO_Pin_8|GPIO_Pin_9\
+                                          |GPIO_Pin_10|GPIO_Pin_11\
+                                          |GPIO_Pin_12;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOC, &GPIO_InitStructure);
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3\
+                                          |GPIO_Pin_4|GPIO_Pin_5\
+                                          |GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+        case 0x2081050C:     //CH32V208RBT6
+        {
+            GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4\
+                                          |GPIO_Pin_5|GPIO_Pin_6;
+            GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
+            GPIO_Init(GPIOD, &GPIO_InitStructure);
+            break;
+        }
+#endif
+        default:
+        {
+            break;
+        }
+    }
+}

src/peripheral/src/ch32v20x_iwdg.c

@@ -0,0 +1,123 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_iwdg.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2023/12/29
+ * Description        : This file provides all the IWDG firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_iwdg.h"
+
+/* CTLR register bit mask */
+#define CTLR_KEY_Reload    ((uint16_t)0xAAAA)
+#define CTLR_KEY_Enable    ((uint16_t)0xCCCC)
+
+/*********************************************************************
+ * @fn      IWDG_WriteAccessCmd
+ *
+ * @brief   Enables or disables write access to IWDG_PSCR and IWDG_RLDR registers.
+ *
+ * @param   WDG_WriteAccess - new state of write access to IWDG_PSCR and
+ *        IWDG_RLDR registers.
+ *            IWDG_WriteAccess_Enable - Enable write access to IWDG_PSCR and
+ *        IWDG_RLDR registers.
+ *            IWDG_WriteAccess_Disable - Disable write access to IWDG_PSCR
+ *        and IWDG_RLDR registers.
+ *
+ * @return  none
+ */
+void IWDG_WriteAccessCmd(uint16_t IWDG_WriteAccess)
+{
+    IWDG->CTLR = IWDG_WriteAccess;
+}
+
+/*********************************************************************
+ * @fn      IWDG_SetPrescaler
+ *
+ * @brief   Sets IWDG Prescaler value.
+ *
+ * @param   IWDG_Prescaler - specifies the IWDG Prescaler value.
+ *             IWDG_Prescaler_4 - IWDG prescaler set to 4.
+ *             IWDG_Prescaler_8 - IWDG prescaler set to 8.
+ *             IWDG_Prescaler_16 - IWDG prescaler set to 16.
+ *             IWDG_Prescaler_32 - IWDG prescaler set to 32.
+ *             IWDG_Prescaler_64 - IWDG prescaler set to 64.
+ *             IWDG_Prescaler_128 - IWDG prescaler set to 128.
+ *             IWDG_Prescaler_256 - IWDG prescaler set to 256.
+ *
+ * @return  none
+ */
+void IWDG_SetPrescaler(uint8_t IWDG_Prescaler)
+{
+    IWDG->PSCR = IWDG_Prescaler;
+}
+
+/*********************************************************************
+ * @fn      IWDG_SetReload
+ *
+ * @brief   Sets IWDG Reload value.
+ *
+ * @param   Reload - specifies the IWDG Reload value.
+ *            This parameter must be a number between 0 and 0x0FFF.
+ *
+ * @return  none
+ */
+void IWDG_SetReload(uint16_t Reload)
+{
+    IWDG->RLDR = Reload;
+}
+
+/*********************************************************************
+ * @fn      IWDG_ReloadCounter
+ *
+ * @brief   Reloads IWDG counter with value defined in the reload register.
+ *
+ * @return  none
+ */
+void IWDG_ReloadCounter(void)
+{
+    IWDG->CTLR = CTLR_KEY_Reload;
+}
+
+/*********************************************************************
+ * @fn      IWDG_Enable
+ *
+ * @brief   Enables IWDG (write access to IWDG_PSCR and IWDG_RLDR registers disabled).
+ *
+ * @return  none
+ */
+void IWDG_Enable(void)
+{
+    IWDG->CTLR = CTLR_KEY_Enable;
+    while((RCC->RSTSCKR & 0x2)==RESET);
+}
+
+/*********************************************************************
+ * @fn      IWDG_GetFlagStatus
+ *
+ * @brief   Checks whether the specified IWDG flag is set or not.
+ *
+ * @param   IWDG_FLAG - specifies the flag to check.
+ *            IWDG_FLAG_PVU - Prescaler Value Update on going.
+ *            IWDG_FLAG_RVU - Reload Value Update on going.
+ *
+ * @return  none
+ */
+FlagStatus IWDG_GetFlagStatus(uint16_t IWDG_FLAG)
+{
+    FlagStatus bitstatus = RESET;
+
+    if((IWDG->STATR & IWDG_FLAG) != (uint32_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+
+    return bitstatus;
+}

src/peripheral/src/ch32v20x_misc.c

@@ -0,0 +1,81 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_misc.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the miscellaneous firmware functions .
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_misc.h"
+
+__IO uint32_t NVIC_Priority_Group = 0;
+
+/*********************************************************************
+ * @fn      NVIC_PriorityGroupConfig
+ *
+ * @brief   Configures the priority grouping - pre-emption priority and subpriority.
+ *
+ * @param   NVIC_PriorityGroup - specifies the priority grouping bits length.
+ *            NVIC_PriorityGroup_0 - 0 bits for pre-emption priority
+ *                                   3 bits for subpriority
+ *            NVIC_PriorityGroup_1 - 1 bits for pre-emption priority
+ *                                   2 bits for subpriority
+ *
+ * @return  none
+ */
+void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
+{
+    NVIC_Priority_Group = NVIC_PriorityGroup;
+}
+
+/*********************************************************************
+ * @fn      NVIC_Init
+ *
+ * @brief   Initializes the NVIC peripheral according to the specified parameters in
+ *        the NVIC_InitStruct.
+ *
+ * @param   NVIC_InitStruct - pointer to a NVIC_InitTypeDef structure that contains the
+ *        configuration information for the specified NVIC peripheral.
+ *            interrupt nesting enable(CSR-0x804 bit1 = 1)
+ *              NVIC_IRQChannelPreemptionPriority - range from 0 to 1.
+ *              NVIC_IRQChannelSubPriority - range from 0 to 3.
+ *
+ *            interrupt nesting disable(CSR-0x804 bit1 = 0)
+ *              NVIC_IRQChannelPreemptionPriority - range is 0.
+ *              NVIC_IRQChannelSubPriority - range from 0 to 7.
+ *
+ * @return  none
+ */
+void NVIC_Init(NVIC_InitTypeDef *NVIC_InitStruct)
+{
+#if (INTSYSCR_INEST == INTSYSCR_INEST_NoEN)
+    if(NVIC_Priority_Group == NVIC_PriorityGroup_0)
+    {
+        NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, NVIC_InitStruct->NVIC_IRQChannelSubPriority << 4);
+    }
+#else
+    if(NVIC_Priority_Group == NVIC_PriorityGroup_1)
+    {
+        if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority == 1)
+        {
+            NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (1 << 7) | (NVIC_InitStruct->NVIC_IRQChannelSubPriority << 5));
+        }
+        else if(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority == 0)
+        {
+            NVIC_SetPriority(NVIC_InitStruct->NVIC_IRQChannel, (0 << 7) | (NVIC_InitStruct->NVIC_IRQChannelSubPriority << 5));
+        }
+    }
+#endif
+
+    if(NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
+    {
+        NVIC_EnableIRQ(NVIC_InitStruct->NVIC_IRQChannel);
+    }
+    else
+    {
+        NVIC_DisableIRQ(NVIC_InitStruct->NVIC_IRQChannel);
+    }
+}

src/peripheral/src/ch32v20x_opa.c

@@ -0,0 +1,86 @@
+/********************************** (C) COPYRIGHT  *******************************
+ * File Name          : ch32v20x_opa.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the OPA firmware functions.
+ *********************************************************************************
+ * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+ * Attention: This software (modified or not) and binary are used for 
+ * microcontroller manufactured by Nanjing Qinheng Microelectronics.
+ *******************************************************************************/
+#include "ch32v20x_opa.h"
+
+#define OPA_MASK         ((uint32_t)0x000F)
+#define OPA_Total_NUM    4
+
+/*********************************************************************
+ * @fn      OPA_DeInit
+ *
+ * @brief   Deinitializes the OPA peripheral registers to their default
+ *        reset values.
+ *
+ * @return  none
+ */
+void OPA_DeInit(void)
+{
+    OPA->CR = 0;
+}
+
+/*********************************************************************
+ * @fn      OPA_Init
+ *
+ * @brief   Initializes the OPA peripheral according to the specified
+ *        parameters in the OPA_InitStruct.
+ *
+ * @param   OPA_InitStruct - pointer to a OPA_InitTypeDef structure
+ *
+ * @return  none
+ */
+void OPA_Init(OPA_InitTypeDef *OPA_InitStruct)
+{
+    uint32_t tmp = 0;
+    tmp = OPA->CR;
+    tmp &= ~(OPA_MASK << (OPA_InitStruct->OPA_NUM * OPA_Total_NUM));
+    tmp |= (((OPA_InitStruct->PSEL << OPA_PSEL_OFFSET) | (OPA_InitStruct->NSEL << OPA_NSEL_OFFSET) | (OPA_InitStruct->Mode << OPA_MODE_OFFSET)) << (OPA_InitStruct->OPA_NUM * OPA_Total_NUM));
+    OPA->CR = tmp;
+}
+
+/*********************************************************************
+ * @fn      OPA_StructInit
+ *
+ * @brief   Fills each OPA_StructInit member with its reset value.
+ *
+ * @param   OPA_StructInit - pointer to a OPA_InitTypeDef structure
+ *
+ * @return  none
+ */
+void OPA_StructInit(OPA_InitTypeDef *OPA_InitStruct)
+{
+    OPA_InitStruct->Mode = OUT_IO_OUT1;
+    OPA_InitStruct->PSEL = CHP0;
+    OPA_InitStruct->NSEL = CHN0;
+    OPA_InitStruct->OPA_NUM = OPA1;
+}
+
+/*********************************************************************
+ * @fn      OPA_Cmd
+ *
+ * @brief   Enables or disables the specified OPA peripheral.
+ *
+ * @param   OPA_NUM - Select OPA
+ *            NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void OPA_Cmd(OPA_Num_TypeDef OPA_NUM, FunctionalState NewState)
+{
+    if(NewState == ENABLE)
+    {
+        OPA->CR |= (1 << (OPA_NUM * OPA_Total_NUM));
+    }
+    else
+    {
+        OPA->CR &= ~(1 << (OPA_NUM * OPA_Total_NUM));
+    }
+}

src/peripheral/src/ch32v20x_pwr.c

@@ -0,0 +1,398 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_pwr.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the PWR firmware functions.
+ *********************************************************************************
+ * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+ * Attention: This software (modified or not) and binary are used for 
+ * microcontroller manufactured by Nanjing Qinheng Microelectronics.
+ *******************************************************************************/
+#include "ch32v20x_pwr.h"
+#include "ch32v20x_rcc.h"
+
+/* PWR registers bit mask */
+/* CTLR register bit mask */
+#define CTLR_DS_MASK     ((uint32_t)0xFFFFFFFC)
+#define CTLR_PLS_MASK    ((uint32_t)0xFFFFFF1F)
+
+/*********************************************************************
+ * @fn      PWR_DeInit
+ *
+ * @brief   Deinitializes the PWR peripheral registers to their default
+ *        reset values.
+ *
+ * @return  none
+ */
+void PWR_DeInit(void)
+{
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_PWR, ENABLE);
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_PWR, DISABLE);
+}
+
+/*********************************************************************
+ * @fn      PWR_BackupAccessCmd
+ *
+ * @brief   Enables or disables access to the RTC and backup registers.
+ *
+ * @param   NewState - new state of the access to the RTC and backup registers,
+ *            This parameter can be: ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void PWR_BackupAccessCmd(FunctionalState NewState)
+{
+    if(NewState)
+    {
+        PWR->CTLR |= (1 << 8);
+    }
+    else
+    {
+        PWR->CTLR &= ~(1 << 8);
+    }
+}
+
+/*********************************************************************
+ * @fn      PWR_PVDCmd
+ *
+ * @brief   Enables or disables the Power Voltage Detector(PVD).
+ *
+ * @param   NewState - new state of the PVD(ENABLE or DISABLE).
+ *
+ * @return  none
+ */
+void PWR_PVDCmd(FunctionalState NewState)
+{
+    if(NewState)
+    {
+        PWR->CTLR |= (1 << 4);
+    }
+    else
+    {
+        PWR->CTLR &= ~(1 << 4);
+    }
+}
+
+/*********************************************************************
+ * @fn      PWR_PVDLevelConfig
+ *
+ * @brief   Configures the voltage threshold detected by the Power Voltage
+ *        Detector(PVD).
+ *
+ * @param   PWR_PVDLevel - specifies the PVD detection level
+ *            PWR_PVDLevel_MODE0 - PVD detection level set to mode 0.
+ *            PWR_PVDLevel_MODE1 - PVD detection level set to mode 1.
+ *            PWR_PVDLevel_MODE2 - PVD detection level set to mode 2.
+ *            PWR_PVDLevel_MODE3 - PVD detection level set to mode 3.
+ *            PWR_PVDLevel_MODE4 - PVD detection level set to mode 4.
+ *            PWR_PVDLevel_MODE5 - PVD detection level set to mode 5.
+ *            PWR_PVDLevel_MODE6 - PVD detection level set to mode 6.
+ *            PWR_PVDLevel_MODE7 - PVD detection level set to mode 7.
+ *
+ * @return  none
+ */
+void PWR_PVDLevelConfig(uint32_t PWR_PVDLevel)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = PWR->CTLR;
+    tmpreg &= CTLR_PLS_MASK;
+    tmpreg |= PWR_PVDLevel;
+    PWR->CTLR = tmpreg;
+}
+
+/*********************************************************************
+ * @fn      PWR_WakeUpPinCmd
+ *
+ * @brief   Enables or disables the WakeUp Pin functionality.
+ *
+ * @param   NewState - new state of the WakeUp Pin functionality
+ *        (ENABLE or DISABLE).
+ *
+ * @return  none
+ */
+void PWR_WakeUpPinCmd(FunctionalState NewState)
+{
+    if(NewState)
+    {
+        PWR->CSR |= (1 << 8);
+    }
+    else
+    {
+        PWR->CSR &= ~(1 << 8);
+    }
+}
+
+/*********************************************************************
+ * @fn      PWR_EnterSTOPMode
+ *
+ * @brief   Enters STOP mode.
+ *
+ * @param   PWR_Regulator - specifies the regulator state in STOP mode.
+ *            PWR_Regulator_ON - STOP mode with regulator ON
+ *            PWR_Regulator_LowPower - STOP mode with regulator in low power mode
+ *          PWR_STOPEntry - specifies if STOP mode in entered with WFI or WFE instruction.
+ *            PWR_STOPEntry_WFI - enter STOP mode with WFI instruction
+ *            PWR_STOPEntry_WFE - enter STOP mode with WFE instruction
+ *
+ * @return  none
+ */
+void PWR_EnterSTOPMode(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = PWR->CTLR;
+    tmpreg &= CTLR_DS_MASK;
+    tmpreg |= PWR_Regulator;
+    PWR->CTLR = tmpreg;
+
+    NVIC->SCTLR |= (1 << 2);
+
+    if(PWR_STOPEntry == PWR_STOPEntry_WFI)
+    {
+        __WFI();
+    }
+    else
+    {
+        __WFE();
+    }
+
+    NVIC->SCTLR &= ~(1 << 2);
+}
+
+/*********************************************************************
+ * @fn      PWR_EnterSTANDBYMode
+ *
+ * @brief   Enters STANDBY mode.
+ *
+ * @return  none
+ */
+void PWR_EnterSTANDBYMode(void)
+{
+    PWR->CTLR |= PWR_CTLR_CWUF;
+    PWR->CTLR |= PWR_CTLR_PDDS;
+    NVIC->SCTLR |= (1 << 2);
+
+    __WFI();
+}
+
+/*********************************************************************
+ * @fn      PWR_GetFlagStatus
+ *
+ * @brief   Checks whether the specified PWR flag is set or not.
+ *
+ * @param   PWR_FLAG - specifies the flag to check.
+ *            PWR_FLAG_WU - Wake Up flag
+ *            PWR_FLAG_SB - StandBy flag
+ *            PWR_FLAG_PVDO - PVD Output
+ *
+ * @return  The new state of PWR_FLAG (SET or RESET).
+ */
+FlagStatus PWR_GetFlagStatus(uint32_t PWR_FLAG)
+{
+    FlagStatus bitstatus = RESET;
+
+    if((PWR->CSR & PWR_FLAG) != (uint32_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      PWR_ClearFlag
+ *
+ * @brief   Clears the PWR's pending flags.
+ *
+ * @param   PWR_FLAG - specifies the flag to clear.
+ *            PWR_FLAG_WU - Wake Up flag
+ *            PWR_FLAG_SB - StandBy flag
+ *
+ * @return  none
+ */
+void PWR_ClearFlag(uint32_t PWR_FLAG)
+{
+    PWR->CTLR |= PWR_FLAG << 2;
+}
+
+/*********************************************************************
+ * @fn      PWR_EnterSTANDBYMode_RAM
+ *
+ * @brief   Enters STANDBY mode with RAM data retention function on.
+ *
+ * @return  none
+ */
+void PWR_EnterSTANDBYMode_RAM(void)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = PWR->CTLR;
+
+    tmpreg |= PWR_CTLR_CWUF;
+    tmpreg |= PWR_CTLR_PDDS;
+
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+    //2K+30K in standby w power.
+    tmpreg |= (0x1 << 16) | (0x1 << 17);
+#else
+    //RAM in standby power.
+    tmpreg |= ( ( uint32_t )1 << 16 );
+
+#endif
+
+    PWR->CTLR = tmpreg;
+
+    NVIC->SCTLR |= (1 << 2);
+
+    __WFI();
+}
+
+/*********************************************************************
+ * @fn      PWR_EnterSTANDBYMode_RAM_LV
+ *
+ * @brief   Enters STANDBY mode with RAM data retention function and LV mode on.
+ *
+ * @return  none
+ */
+void PWR_EnterSTANDBYMode_RAM_LV(void)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = PWR->CTLR;
+
+    tmpreg |= PWR_CTLR_CWUF;
+    tmpreg |= PWR_CTLR_PDDS;
+
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+    //2K+30K in standby power.
+    tmpreg |= (0x1 << 16) | (0x1 << 17);
+    //2K+30K in standby LV .
+    tmpreg |= (0x1 << 20);
+#else
+    //RAM in standby power.
+    tmpreg |= ( ( uint32_t )1 << 16 );
+    //RAM in standby LV .
+    tmpreg |= ( ( uint32_t )1 << 20 );
+
+#endif
+
+    PWR->CTLR = tmpreg;
+
+    NVIC->SCTLR |= (1 << 2);
+
+    __WFI();
+}
+
+/*********************************************************************
+ * @fn      PWR_EnterSTANDBYMode_RAM_VBAT_EN
+ *
+ * @brief   Enters STANDBY mode with RAM data retention function on (VBAT Enable).
+ *
+ * @return  none
+ */
+void PWR_EnterSTANDBYMode_RAM_VBAT_EN(void)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = PWR->CTLR;
+
+    tmpreg |= PWR_CTLR_CWUF;
+    tmpreg |= PWR_CTLR_PDDS;
+
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+    //2K+30K in standby power (VBAT Enable).
+    tmpreg |= (0x1 << 18) | (0x1 << 19);
+#else
+      //RAM in standby w power.
+    tmpreg |= ( ( uint32_t )1 << 18 );
+
+#endif
+
+    PWR->CTLR = tmpreg;
+
+    NVIC->SCTLR |= (1 << 2);
+
+    __WFI();
+}
+
+/*********************************************************************
+ * @fn      PWR_EnterSTANDBYMode_RAM_LV_VBAT_EN
+ *
+ * @brief   Enters STANDBY mode with RAM data retention function and LV mode on(VBAT Enable).
+ *
+ * @return  none
+ */
+void PWR_EnterSTANDBYMode_RAM_LV_VBAT_EN(void)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = PWR->CTLR;
+
+    tmpreg |= PWR_CTLR_CWUF;
+    tmpreg |= PWR_CTLR_PDDS;
+
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+    //2K+30K in standby power (VBAT Enable).
+    tmpreg |= (0x1 << 18) | (0x1 << 19);
+    //2K+30K in standby LV .
+    tmpreg |= (0x1 << 20);
+#else
+      //RAM in standby w power.
+    tmpreg |= ( ( uint32_t )1 << 18 );
+    //RAM in standby LV .
+    tmpreg |= ( ( uint32_t )1 << 20 );
+
+#endif
+
+    PWR->CTLR = tmpreg;
+
+    NVIC->SCTLR |= (1 << 2);
+
+    __WFI();
+}
+
+
+/*********************************************************************
+ * @fn      PWR_EnterSTOPMode_RAM_LV
+ *
+ * @brief   Enters STOP mode with RAM data retention function and LV mode on.
+ *
+ * @param   PWR_Regulator - specifies the regulator state in STOP mode.
+ *            PWR_Regulator_ON - STOP mode with regulator ON
+ *            PWR_Regulator_LowPower - STOP mode with regulator in low power mode
+ *          PWR_STOPEntry - specifies if STOP mode in entered with WFI or WFE instruction.
+ *            PWR_STOPEntry_WFI - enter STOP mode with WFI instruction
+ *            PWR_STOPEntry_WFE - enter STOP mode with WFE instruction
+ *
+ * @return  none
+ */
+void PWR_EnterSTOPMode_RAM_LV(uint32_t PWR_Regulator, uint8_t PWR_STOPEntry)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = PWR->CTLR;
+    tmpreg &= CTLR_DS_MASK;
+    tmpreg |= PWR_Regulator;
+
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+
+    tmpreg |= (0x1 << 20);
+#else
+
+    tmpreg |= ( ( uint32_t )1 << 20 );
+
+#endif
+
+    PWR->CTLR = tmpreg;
+
+    NVIC->SCTLR |= (1 << 2);
+
+    if(PWR_STOPEntry == PWR_STOPEntry_WFI)
+    {
+        __WFI();
+    }
+    else
+    {
+        __WFE();
+    }
+
+    NVIC->SCTLR &= ~(1 << 2);
+}

src/peripheral/src/ch32v20x_rtc.c

@@ -0,0 +1,478 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_rtc.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/01/06
+ * Description        : This file provides all the RTC firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_rtc.h"
+
+/* RTC_Private_Defines */
+#define RTC_LSB_MASK     ((uint32_t)0x0000FFFF) /* RTC LSB Mask */
+#define PRLH_MSB_MASK    ((uint32_t)0x000F0000) /* RTC Prescaler MSB Mask */
+
+/*********************************************************************
+ * @fn      RTC_ITConfig
+ *
+ * @brief   Enables or disables the specified RTC interrupts.
+ *
+ * @param   RTC_IT - specifies the RTC interrupts sources to be enabled or disabled.
+ *            RTC_IT_OW - Overflow interrupt
+ *            RTC_IT_ALR - Alarm interrupt
+ *            RTC_IT_SEC - Second interrupt
+ *
+ * @return  NewState - new state of the specified RTC interrupts(ENABLE or DISABLE).
+ */
+void RTC_ITConfig(uint16_t RTC_IT, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        RTC->CTLRH |= RTC_IT;
+    }
+    else
+    {
+        RTC->CTLRH &= (uint16_t)~RTC_IT;
+    }
+}
+
+/*********************************************************************
+ * @fn      RTC_EnterConfigMode
+ *
+ * @brief   Enters the RTC configuration mode.
+ *
+ * @return  none
+ */
+void RTC_EnterConfigMode(void)
+{
+    RTC->CTLRL |= RTC_CTLRL_CNF;
+}
+
+/*********************************************************************
+ * @fn      RTC_ExitConfigMode
+ *
+ * @brief   Exits from the RTC configuration mode.
+ *
+ * @return  none
+ */
+void RTC_ExitConfigMode(void)
+{
+    RTC->CTLRL &= (uint16_t) ~((uint16_t)RTC_CTLRL_CNF);
+}
+
+/*********************************************************************
+ * @fn      RTC_GetCounter
+ *
+ * @brief   Gets the RTC counter value
+ *
+ * @return  RTC counter value
+ */
+uint32_t RTC_GetCounter(void)
+{
+    uint16_t high1a = 0, high1b = 0, high2a = 0, high2b = 0;
+    uint16_t low1 = 0, low2 = 0;
+
+    do{
+        high1a = RTC->CNTH;
+        high1b = RTC->CNTH;
+    }while( high1a != high1b );
+
+    do{
+        low1 = RTC->CNTL;
+        low2 = RTC->CNTL;
+    }while( low1 != low2 );
+
+    do{
+        high2a = RTC->CNTH;
+        high2b = RTC->CNTH;
+    }while( high2a != high2b );
+
+    if(high1b != high2b)
+    {
+        do{
+            low1 = RTC->CNTL;
+            low2 = RTC->CNTL;
+        }while( low1 != low2 );
+    }
+
+    return (((uint32_t)high2b << 16) | low2);
+}
+
+
+/*********************************************************************
+ * @fn      RTC_SetCounter
+ *
+ * @brief   Sets the RTC counter value.
+ *
+ * @param   CounterValue - RTC counter new value.
+ *
+ * @return  RTC counter value
+ */
+void RTC_SetCounter(uint32_t CounterValue)
+{
+    RTC_EnterConfigMode();
+    RTC->CNTH = CounterValue >> 16;
+    RTC->CNTL = (CounterValue & RTC_LSB_MASK);
+    RTC_ExitConfigMode();
+}
+
+/*********************************************************************
+ * @fn      RTC_SetPrescaler
+ *
+ * @brief   Sets the RTC prescaler value
+ *
+ * @param   PrescalerValue - RTC prescaler new value
+ *
+ * @return  none
+ */
+void RTC_SetPrescaler(uint32_t PrescalerValue)
+{
+    RTC_EnterConfigMode();
+    RTC->PSCRH = (PrescalerValue & PRLH_MSB_MASK) >> 16;
+    RTC->PSCRL = (PrescalerValue & RTC_LSB_MASK);
+    RTC_ExitConfigMode();
+}
+
+/*********************************************************************
+ * @fn      RTC_SetAlarm
+ *
+ * @brief   Sets the RTC alarm value
+ *
+ * @param   AlarmValue - RTC alarm new value
+ *
+ * @return  none
+ */
+void RTC_SetAlarm(uint32_t AlarmValue)
+{
+    RTC_EnterConfigMode();
+    RTC->ALRMH = AlarmValue >> 16;
+    RTC->ALRML = (AlarmValue & RTC_LSB_MASK);
+    RTC_ExitConfigMode();
+}
+
+/*********************************************************************
+ * @fn      RTC_GetDivider
+ *
+ * @brief   Gets the RTC divider value
+ *
+ * @return  RTC Divider value
+ */
+uint32_t RTC_GetDivider(void)
+{
+    uint16_t high1a = 0, high1b = 0, high2a = 0, high2b = 0;
+    uint16_t low1 = 0, low2 = 0;
+
+    do{
+        high1a = RTC->DIVH;
+        high1b = RTC->DIVH;
+    }while( high1a != high1b );
+
+    do{
+        low1 = RTC->DIVL;
+        low2 = RTC->DIVL;
+    }while( low1 != low2 );
+
+    do{
+        high2a = RTC->DIVH;
+        high2b = RTC->DIVH;
+    }while( high2a != high2b );
+
+    if(high1b != high2b)
+    {
+        do{
+            low1 = RTC->DIVL;
+            low2 = RTC->DIVL;
+        }while( low1 != low2 );
+    }
+
+    return ((((uint32_t)high2b & (uint32_t)0x000F) << 16) | low2);
+}
+
+/*********************************************************************
+ * @fn      RTC_WaitForLastTask
+ *
+ * @brief   Waits until last write operation on RTC registers has finished
+ *          Note-
+ *          This function must be called before any write to RTC registers.
+ * @return  none
+ */
+void RTC_WaitForLastTask(void)
+{
+    while((RTC->CTLRL & RTC_FLAG_RTOFF) == (uint16_t)RESET)
+    {
+    }
+}
+
+/*********************************************************************
+ * @fn      RTC_WaitForSynchro
+ *
+ * @brief   Waits until the RTC registers are synchronized with RTC APB clock
+ *          Note-
+ *          This function must be called before any read operation after an APB reset
+ *          or an APB clock stop.
+ *          
+ * @return  none
+ */
+void RTC_WaitForSynchro(void)
+{
+    RTC->CTLRL &= (uint16_t)~RTC_FLAG_RSF;
+    while((RTC->CTLRL & RTC_FLAG_RSF) == (uint16_t)RESET)
+    {
+    }
+}
+
+/*********************************************************************
+ * @fn      RTC_GetFlagStatus
+ *
+ * @brief   Checks whether the specified RTC flag is set or not
+ *
+ * @param   RTC_FLAG- specifies the flag to check
+ *            RTC_FLAG_RTOFF - RTC Operation OFF flag
+ *            RTC_FLAG_RSF - Registers Synchronized flag
+ *            RTC_FLAG_OW - Overflow flag
+ *            RTC_FLAG_ALR - Alarm flag
+ *            RTC_FLAG_SEC - Second flag
+ *
+ * @return  The new state of RTC_FLAG (SET or RESET)
+ */
+FlagStatus RTC_GetFlagStatus(uint16_t RTC_FLAG)
+{
+    FlagStatus bitstatus = RESET;
+    if((RTC->CTLRL & RTC_FLAG) != (uint16_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      RTC_ClearFlag
+ *
+ * @brief   Clears the RTC's pending flags
+ *
+ * @param   RTC_FLAG - specifies the flag to clear
+ *            RTC_FLAG_RSF - Registers Synchronized flag
+ *            RTC_FLAG_OW - Overflow flag
+ *            RTC_FLAG_ALR - Alarm flag
+ *            RTC_FLAG_SEC - Second flag
+ *
+ * @return  none
+ */
+void RTC_ClearFlag(uint16_t RTC_FLAG)
+{
+    RTC->CTLRL &= (uint16_t)~RTC_FLAG;
+}
+
+/*********************************************************************
+ * @fn      RTC_GetITStatus
+ *
+ * @brief   Checks whether the specified RTC interrupt has occurred or not
+ *
+ * @param   RTC_IT - specifies the RTC interrupts sources to check
+ *            RTC_FLAG_OW - Overflow interrupt
+ *            RTC_FLAG_ALR - Alarm interrupt
+ *            RTC_FLAG_SEC - Second interrupt
+ *
+ * @return  The new state of the RTC_IT (SET or RESET)
+ */
+ITStatus RTC_GetITStatus(uint16_t RTC_IT)
+{
+    ITStatus bitstatus = RESET;
+
+    bitstatus = (ITStatus)(RTC->CTLRL & RTC_IT);
+    if(((RTC->CTLRH & RTC_IT) != (uint16_t)RESET) && (bitstatus != (uint16_t)RESET))
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      RTC_ClearITPendingBit
+ *
+ * @brief   Clears the RTC's interrupt pending bits
+ *
+ * @param   RTC_IT - specifies the interrupt pending bit to clear
+ *            RTC_FLAG_OW - Overflow interrupt
+ *            RTC_FLAG_ALR - Alarm interrupt
+ *            RTC_FLAG_SEC - Second interrupt
+ *
+ * @return  none
+ */
+void RTC_ClearITPendingBit(uint16_t RTC_IT)
+{
+    RTC->CTLRL &= (uint16_t)~RTC_IT;
+}
+
+#if defined(CH32V20x_D8) || defined(CH32V20x_D8W)
+/*******************************************************************************
+ * @fn            Calibration_LSI
+ *
+ * @brief         LSI calibration
+ *
+ * @param         cali_Lv : calibration level
+ *                Level_32  -   1.2ms 1100ppm
+ *                Level_64  -   2.2ms 1000ppm
+ *                Level_128 -   4.2ms 800ppm
+ *
+ * @return        None
+ */
+void Calibration_LSI(Cali_LevelTypeDef cali_Lv)
+{
+    uint32_t i;
+    int32_t  cnt_offset;
+    int32_t  Freq = 0;
+    uint8_t  retry = 0;
+    uint8_t  retry_all = 0;
+    uint32_t cnt_32k = 0;
+    Freq = SystemCoreClock;
+    // Coarse tuning
+    OSC->LSI32K_CAL_CFG &= ~RB_OSC_CNT_VLU;
+    OSC->LSI32K_CAL_CFG |= 0;
+    while(1)
+    {
+        retry_all++;
+        while(1)
+        {
+            OSC->LSI32K_CAL_CTRL |= RB_OSC_CAL_EN;
+            OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+            OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_IF_END;
+            while(!(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END));
+            i = OSC->LSI32K_CAL_STATR;
+            OSC->LSI32K_CAL_CTRL &= ~RB_OSC_CAL_EN;
+            OSC->LSI32K_CAL_CTRL |= RB_OSC_CAL_EN;
+            OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+            OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_IF_END;
+            cnt_32k = RTC_GetCounter();
+            while(RTC_GetCounter() == cnt_32k);
+            OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+            while(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END);
+            while(!(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END));
+            i = OSC->LSI32K_CAL_STATR;
+            cnt_offset = (i & 0x3FFF) + OSC->LSI32K_CAL_OV_CNT * 0x3FFF - 2000 * (Freq / 1000) / CAB_LSIFQ;
+            if(((cnt_offset > -(20 * (Freq / 1000) / 36000)) && (cnt_offset < (20 * (Freq / 1000) / 36000))) || retry > 2)
+                break;
+            retry++;
+            cnt_offset = (cnt_offset > 0) ? (((cnt_offset * 2) / (40 * (Freq / 1000) / 36000)) + 1) / 2 : (((cnt_offset * 2) / (40 * (Freq / 1000) / 36000)) - 1) / 2;
+            OSC->LSI32K_TUNE += cnt_offset;
+        }
+        OSC->LSI32K_CAL_CFG &= ~RB_OSC_CNT_VLU;
+        OSC->LSI32K_CAL_CFG |= 2;
+        OSC->LSI32K_CAL_CTRL &= ~RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_CTRL |= RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_IF_END;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+
+        // Fine tuning
+        // After configuring the fine-tuning parameters, discard the two captured values (software behavior) and judge once, only one time is left here
+        while(!(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END));
+        i = OSC->LSI32K_CAL_STATR;
+        OSC->LSI32K_CAL_CTRL &= ~RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_CTRL |= RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_IF_END;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+        cnt_32k = RTC_GetCounter();
+        while(RTC_GetCounter() == cnt_32k);
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+        while(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END);
+        while(!(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END));
+        i = OSC->LSI32K_CAL_STATR;
+        cnt_offset = (i & 0x3FFF) + OSC->LSI32K_CAL_OV_CNT * 0x3FFF - 8000 * (1 << 2) * (Freq / 1000000) / 256 * 1000 / (CAB_LSIFQ / 256);
+        cnt_offset = (cnt_offset > 0) ? ((((cnt_offset * 2 * 100) / (748 * ((1 << 2) / 4) * (Freq / 1000) / 36000)) + 1) / 2) : ((((cnt_offset * 2 * 100) / (748 * ((1 << 2) / 4) * (Freq / 1000) / 36000)) - 1) / 2);
+        if((cnt_offset > 0)&&(((OSC->LSI32K_TUNE>>5)+cnt_offset)>0x7FF))
+        {
+            if(retry_all>2)
+            {
+                OSC->LSI32K_TUNE |= (0xFF<<5);
+            }
+            else
+            {
+                OSC->LSI32K_TUNE = (OSC->LSI32K_TUNE&0x1F)|(0x3FF<<5);
+                continue;
+            }
+        }
+        else if((cnt_offset < 0)&&((OSC->LSI32K_TUNE>>5)<(-cnt_offset)))
+        {
+            if(retry_all>2)
+            {
+                OSC->LSI32K_TUNE &= 0x1F;
+            }
+            else
+            {
+                OSC->LSI32K_TUNE = (OSC->LSI32K_TUNE&0x1F)|(0x7F<<5);
+                continue;
+            }
+        }
+        else
+        {
+            OSC->LSI32K_TUNE += (cnt_offset<<5);
+        }
+        OSC->LSI32K_CAL_CFG &= ~RB_OSC_CNT_VLU;
+        OSC->LSI32K_CAL_CFG |= cali_Lv;
+        OSC->LSI32K_CAL_CTRL &= ~RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_CTRL |= RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_IF_END;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+        // Fine tuning
+        // After configuring the fine-tuning parameters, discard the two captured values (software behavior) and judge once, only one time is left here
+        while(!(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END));
+        i = OSC->LSI32K_CAL_STATR;
+        OSC->LSI32K_CAL_CTRL &= ~RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_CTRL |= RB_OSC_CAL_EN;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_IF_END;
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+        cnt_32k = RTC_GetCounter();
+        while(RTC_GetCounter() == cnt_32k);
+        OSC->LSI32K_CAL_STATR |= RB_OSC_CAL_CNT_OV;
+        while(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END);
+        while(!(OSC->LSI32K_CAL_STATR & RB_OSC_CAL_IF_END));
+        OSC->LSI32K_CAL_CTRL &= ~RB_OSC_CAL_EN;
+        i = OSC->LSI32K_CAL_STATR;
+        cnt_offset = (i & 0x3FFF) + OSC->LSI32K_CAL_OV_CNT * 0x3FFF - 8000 * (1 << cali_Lv) * (Freq / 1000000) / 256 * 1000 / (CAB_LSIFQ / 256);
+        cnt_offset = (cnt_offset > 0) ? ((((cnt_offset * 2 * 100) / (748 * ((1 << cali_Lv) / 4) * (Freq / 1000) / 36000)) + 1) / 2) : ((((cnt_offset * 2 * 100) / (748 * ((1 << cali_Lv) / 4) * (Freq / 1000) / 36000)) - 1) / 2);
+        if((cnt_offset > 0)&&(((OSC->LSI32K_TUNE>>5)+cnt_offset)>0x7FF))
+        {
+            if(retry_all>2)
+            {
+                OSC->LSI32K_TUNE |= (0xFF<<5);
+                return;
+            }
+            else
+            {
+                OSC->LSI32K_TUNE = (OSC->LSI32K_TUNE&0x1F)|(0x3FF<<5);
+                continue;
+            }
+        }
+        else if((cnt_offset < 0)&&((OSC->LSI32K_TUNE>>5)<(-cnt_offset)))
+        {
+            if(retry_all>2)
+            {
+                OSC->LSI32K_TUNE &= 0x1F;
+                return;
+            }
+            else
+            {
+                OSC->LSI32K_TUNE = (OSC->LSI32K_TUNE&0x1F)|(0x3F<<5);
+                continue;
+            }
+        }
+        else
+        {
+            OSC->LSI32K_TUNE += (cnt_offset<<5);
+            return;
+        }
+    }
+}
+
+#endif

src/peripheral/src/ch32v20x_spi.c

@@ -0,0 +1,660 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_spi.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the SPI firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_spi.h"
+#include "ch32v20x_rcc.h"
+
+/* SPI SPE mask */
+#define CTLR1_SPE_Set         ((uint16_t)0x0040)
+#define CTLR1_SPE_Reset       ((uint16_t)0xFFBF)
+
+/* I2S I2SE mask */
+#define I2SCFGR_I2SE_Set      ((uint16_t)0x0400)
+#define I2SCFGR_I2SE_Reset    ((uint16_t)0xFBFF)
+
+/* SPI CRCNext mask */
+#define CTLR1_CRCNext_Set     ((uint16_t)0x1000)
+
+/* SPI CRCEN mask */
+#define CTLR1_CRCEN_Set       ((uint16_t)0x2000)
+#define CTLR1_CRCEN_Reset     ((uint16_t)0xDFFF)
+
+/* SPI SSOE mask */
+#define CTLR2_SSOE_Set        ((uint16_t)0x0004)
+#define CTLR2_SSOE_Reset      ((uint16_t)0xFFFB)
+
+/* SPI registers Masks */
+#define CTLR1_CLEAR_Mask      ((uint16_t)0x3040)
+#define I2SCFGR_CLEAR_Mask    ((uint16_t)0xF040)
+
+/* SPI or I2S mode selection masks */
+#define SPI_Mode_Select       ((uint16_t)0xF7FF)
+#define I2S_Mode_Select       ((uint16_t)0x0800)
+
+/* I2S clock source selection masks */
+#define I2S2_CLOCK_SRC        ((uint32_t)(0x00020000))
+#define I2S3_CLOCK_SRC        ((uint32_t)(0x00040000))
+#define I2S_MUL_MASK          ((uint32_t)(0x0000F000))
+#define I2S_DIV_MASK          ((uint32_t)(0x000000F0))
+
+/*********************************************************************
+ * @fn      SPI_I2S_DeInit
+ *
+ * @brief   Deinitializes the SPIx peripheral registers to their default
+ *        reset values (Affects also the I2Ss).
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *
+ * @return  none
+ */
+void SPI_I2S_DeInit(SPI_TypeDef *SPIx)
+{
+    if(SPIx == SPI1)
+    {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_SPI1, DISABLE);
+    }
+    else if(SPIx == SPI2)
+    {
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, ENABLE);
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_SPI2, DISABLE);
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_Init
+ *
+ * @brief   Initializes the SPIx peripheral according to the specified
+ *        parameters in the SPI_InitStruct.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          SPI_InitStruct - pointer to a SPI_InitTypeDef structure that
+ *        contains the configuration information for the specified SPI peripheral.
+ *
+ * @return  none
+ */
+void SPI_Init(SPI_TypeDef *SPIx, SPI_InitTypeDef *SPI_InitStruct)
+{
+    uint16_t tmpreg = 0;
+
+    tmpreg = SPIx->CTLR1;
+    tmpreg &= CTLR1_CLEAR_Mask;
+    tmpreg |= (uint16_t)((uint32_t)SPI_InitStruct->SPI_Direction | SPI_InitStruct->SPI_Mode |
+                         SPI_InitStruct->SPI_DataSize | SPI_InitStruct->SPI_CPOL |
+                         SPI_InitStruct->SPI_CPHA | SPI_InitStruct->SPI_NSS |
+                         SPI_InitStruct->SPI_BaudRatePrescaler | SPI_InitStruct->SPI_FirstBit);
+
+    SPIx->CTLR1 = tmpreg;
+    SPIx->I2SCFGR &= SPI_Mode_Select;
+    SPIx->CRCR = SPI_InitStruct->SPI_CRCPolynomial;
+}
+
+/*********************************************************************
+ * @fn      I2S_Init
+ *
+ * @brief   Initializes the SPIx peripheral according to the specified
+ *        parameters in the I2S_InitStruct.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *        (configured in I2S mode).
+ *          I2S_InitStruct - pointer to an I2S_InitTypeDef structure that
+ *        contains the configuration information for the specified SPI peripheral
+ *        configured in I2S mode.
+ *
+ * @return  none
+ */
+void I2S_Init(SPI_TypeDef *SPIx, I2S_InitTypeDef *I2S_InitStruct)
+{
+    uint16_t          tmpreg = 0, i2sdiv = 2, i2sodd = 0, packetlength = 1;
+    uint32_t          tmp = 0;
+    RCC_ClocksTypeDef RCC_Clocks;
+    uint32_t          sourceclock = 0;
+
+    SPIx->I2SCFGR &= I2SCFGR_CLEAR_Mask;
+    SPIx->I2SPR = 0x0002;
+    tmpreg = SPIx->I2SCFGR;
+
+    if(I2S_InitStruct->I2S_AudioFreq == I2S_AudioFreq_Default)
+    {
+        i2sodd = (uint16_t)0;
+        i2sdiv = (uint16_t)2;
+    }
+    else
+    {
+        if(I2S_InitStruct->I2S_DataFormat == I2S_DataFormat_16b)
+        {
+            packetlength = 1;
+        }
+        else
+        {
+            packetlength = 2;
+        }
+
+        if(((uint32_t)SPIx) == SPI2_BASE)
+        {
+            tmp = I2S2_CLOCK_SRC;
+        }
+        else
+        {
+            tmp = I2S3_CLOCK_SRC;
+        }
+
+        RCC_GetClocksFreq(&RCC_Clocks);
+
+        sourceclock = RCC_Clocks.SYSCLK_Frequency;
+
+        if(I2S_InitStruct->I2S_MCLKOutput == I2S_MCLKOutput_Enable)
+        {
+            tmp = (uint16_t)(((((sourceclock / 256) * 10) / I2S_InitStruct->I2S_AudioFreq)) + 5);
+        }
+        else
+        {
+            tmp = (uint16_t)(((((sourceclock / (32 * packetlength)) * 10) / I2S_InitStruct->I2S_AudioFreq)) + 5);
+        }
+
+        tmp = tmp / 10;
+        i2sodd = (uint16_t)(tmp & (uint16_t)0x0001);
+        i2sdiv = (uint16_t)((tmp - i2sodd) / 2);
+        i2sodd = (uint16_t)(i2sodd << 8);
+    }
+
+    if((i2sdiv < 2) || (i2sdiv > 0xFF))
+    {
+        i2sdiv = 2;
+        i2sodd = 0;
+    }
+
+    SPIx->I2SPR = (uint16_t)(i2sdiv | (uint16_t)(i2sodd | (uint16_t)I2S_InitStruct->I2S_MCLKOutput));
+    tmpreg |= (uint16_t)(I2S_Mode_Select | (uint16_t)(I2S_InitStruct->I2S_Mode |
+                                                      (uint16_t)(I2S_InitStruct->I2S_Standard | (uint16_t)(I2S_InitStruct->I2S_DataFormat |
+                                                                                                           (uint16_t)I2S_InitStruct->I2S_CPOL))));
+    SPIx->I2SCFGR = tmpreg;
+}
+
+/*********************************************************************
+ * @fn      SPI_StructInit
+ *
+ * @brief   Fills each SPI_InitStruct member with its default value.
+ *
+ * @param   SPI_InitStruct - pointer to a SPI_InitTypeDef structure which
+ *        will be initialized.
+ *
+ * @return  none
+ */
+void SPI_StructInit(SPI_InitTypeDef *SPI_InitStruct)
+{
+    SPI_InitStruct->SPI_Direction = SPI_Direction_2Lines_FullDuplex;
+    SPI_InitStruct->SPI_Mode = SPI_Mode_Slave;
+    SPI_InitStruct->SPI_DataSize = SPI_DataSize_8b;
+    SPI_InitStruct->SPI_CPOL = SPI_CPOL_Low;
+    SPI_InitStruct->SPI_CPHA = SPI_CPHA_1Edge;
+    SPI_InitStruct->SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_2;
+    SPI_InitStruct->SPI_FirstBit = SPI_FirstBit_MSB;
+    SPI_InitStruct->SPI_CRCPolynomial = 7;
+}
+
+/*********************************************************************
+ * @fn      I2S_StructInit
+ *
+ * @brief   Fills each I2S_InitStruct member with its default value.
+ *
+ * @param   I2S_InitStruct - pointer to a I2S_InitTypeDef structure which
+ *        will be initialized.
+ *
+ * @return  none
+ */
+void I2S_StructInit(I2S_InitTypeDef *I2S_InitStruct)
+{
+    I2S_InitStruct->I2S_Mode = I2S_Mode_SlaveTx;
+    I2S_InitStruct->I2S_Standard = I2S_Standard_Phillips;
+    I2S_InitStruct->I2S_DataFormat = I2S_DataFormat_16b;
+    I2S_InitStruct->I2S_MCLKOutput = I2S_MCLKOutput_Disable;
+    I2S_InitStruct->I2S_AudioFreq = I2S_AudioFreq_Default;
+    I2S_InitStruct->I2S_CPOL = I2S_CPOL_Low;
+}
+
+/*********************************************************************
+ * @fn      SPI_Cmd
+ *
+ * @brief   Enables or disables the specified SPI peripheral.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void SPI_Cmd(SPI_TypeDef *SPIx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        SPIx->CTLR1 |= CTLR1_SPE_Set;
+    }
+    else
+    {
+        SPIx->CTLR1 &= CTLR1_SPE_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      I2S_Cmd
+ *
+ * @brief   Enables or disables the specified SPI peripheral (in I2S mode).
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void I2S_Cmd(SPI_TypeDef *SPIx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        SPIx->I2SCFGR |= I2SCFGR_I2SE_Set;
+    }
+    else
+    {
+        SPIx->I2SCFGR &= I2SCFGR_I2SE_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_ITConfig
+ *
+ * @brief   Enables or disables the specified SPI/I2S interrupts.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *            - 2 or 3 in I2S mode.
+ *          SPI_I2S_IT - specifies the SPI/I2S interrupt source to be
+ *        enabled or disabled.
+ *            SPI_I2S_IT_TXE - Tx buffer empty interrupt mask.
+ *            SPI_I2S_IT_RXNE - Rx buffer not empty interrupt mask.
+ *            SPI_I2S_IT_ERR - Error interrupt mask.
+ *          NewState: ENABLE or DISABLE.
+ * @return  none
+ */
+void SPI_I2S_ITConfig(SPI_TypeDef *SPIx, uint8_t SPI_I2S_IT, FunctionalState NewState)
+{
+    uint16_t itpos = 0, itmask = 0;
+
+    itpos = SPI_I2S_IT >> 4;
+    itmask = (uint16_t)1 << (uint16_t)itpos;
+
+    if(NewState != DISABLE)
+    {
+        SPIx->CTLR2 |= itmask;
+    }
+    else
+    {
+        SPIx->CTLR2 &= (uint16_t)~itmask;
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_DMACmd
+ *
+ * @brief   Enables or disables the SPIx/I2Sx DMA interface.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *            - 2 or 3 in I2S mode.
+ *          SPI_I2S_DMAReq - specifies the SPI/I2S DMA transfer request to
+ *        be enabled or disabled.
+ *            SPI_I2S_DMAReq_Tx - Tx buffer DMA transfer request.
+ *            SPI_I2S_DMAReq_Rx - Rx buffer DMA transfer request.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void SPI_I2S_DMACmd(SPI_TypeDef *SPIx, uint16_t SPI_I2S_DMAReq, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        SPIx->CTLR2 |= SPI_I2S_DMAReq;
+    }
+    else
+    {
+        SPIx->CTLR2 &= (uint16_t)~SPI_I2S_DMAReq;
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_SendData
+ *
+ * @brief   Transmits a Data through the SPIx/I2Sx peripheral.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *            - 2 or 3 in I2S mode.
+ *          Data - Data to be transmitted.
+ *
+ * @return  none
+ */
+void SPI_I2S_SendData(SPI_TypeDef *SPIx, uint16_t Data)
+{
+    SPIx->DATAR = Data;
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_ReceiveData
+ *
+ * @brief   Returns the most recent received data by the SPIx/I2Sx peripheral.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *            - 2 or 3 in I2S mode.
+ *          Data - Data to be transmitted.
+ *
+ * @return  SPIx->DATAR - The value of the received data.
+ */
+uint16_t SPI_I2S_ReceiveData(SPI_TypeDef *SPIx)
+{
+    return SPIx->DATAR;
+}
+
+/*********************************************************************
+ * @fn      SPI_NSSInternalSoftwareConfig
+ *
+ * @brief   Configures internally by software the NSS pin for the selected SPI.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          SPI_NSSInternalSoft -
+ *            SPI_NSSInternalSoft_Set - Set NSS pin internally.
+ *            SPI_NSSInternalSoft_Reset - Reset NSS pin internally.
+ *
+ * @return  none
+ */
+void SPI_NSSInternalSoftwareConfig(SPI_TypeDef *SPIx, uint16_t SPI_NSSInternalSoft)
+{
+    if(SPI_NSSInternalSoft != SPI_NSSInternalSoft_Reset)
+    {
+        SPIx->CTLR1 |= SPI_NSSInternalSoft_Set;
+    }
+    else
+    {
+        SPIx->CTLR1 &= SPI_NSSInternalSoft_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_SSOutputCmd
+ *
+ * @brief   Enables or disables the SS output for the selected SPI.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          NewState - new state of the SPIx SS output.
+ *
+ * @return  none
+ */
+void SPI_SSOutputCmd(SPI_TypeDef *SPIx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        SPIx->CTLR2 |= CTLR2_SSOE_Set;
+    }
+    else
+    {
+        SPIx->CTLR2 &= CTLR2_SSOE_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_DataSizeConfig
+ *
+ * @brief   Configures the data size for the selected SPI.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          SPI_DataSize - specifies the SPI data size.
+ *            SPI_DataSize_16b - Set data frame format to 16bit.
+ *            SPI_DataSize_8b - Set data frame format to 8bit.
+ *
+ * @return  none
+ */
+void SPI_DataSizeConfig(SPI_TypeDef *SPIx, uint16_t SPI_DataSize)
+{
+    SPIx->CTLR1 &= (uint16_t)~SPI_DataSize_16b;
+    SPIx->CTLR1 |= SPI_DataSize;
+}
+
+/*********************************************************************
+ * @fn      SPI_TransmitCRC
+ *
+ * @brief   Transmit the SPIx CRC value.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *
+ * @return  none
+ */
+void SPI_TransmitCRC(SPI_TypeDef *SPIx)
+{
+    SPIx->CTLR1 |= CTLR1_CRCNext_Set;
+}
+
+/*********************************************************************
+ * @fn      SPI_CalculateCRC
+ *
+ * @brief   Enables or disables the CRC value calculation of the transferred bytes.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          NewState - new state of the SPIx CRC value calculation.
+ *
+ * @return  none
+ */
+void SPI_CalculateCRC(SPI_TypeDef *SPIx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        SPIx->CTLR1 |= CTLR1_CRCEN_Set;
+    }
+    else
+    {
+        SPIx->CTLR1 &= CTLR1_CRCEN_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_GetCRC
+ *
+ * @brief   Returns the transmit or the receive CRC register value for the specified SPI.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          SPI_CRC - specifies the CRC register to be read.
+ *            SPI_CRC_Tx - Selects Tx CRC register.
+ *            SPI_CRC_Rx - Selects Rx CRC register.
+ *
+ * @return  crcreg: The selected CRC register value.
+ */
+uint16_t SPI_GetCRC(SPI_TypeDef *SPIx, uint8_t SPI_CRC)
+{
+    uint16_t crcreg = 0;
+
+    if(SPI_CRC != SPI_CRC_Rx)
+    {
+        crcreg = SPIx->TCRCR;
+    }
+    else
+    {
+        crcreg = SPIx->RCRCR;
+    }
+
+    return crcreg;
+}
+
+/*********************************************************************
+ * @fn      SPI_GetCRCPolynomial
+ *
+ * @brief   Returns the CRC Polynomial register value for the specified SPI.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *
+ * @return  SPIx->CRCR - The CRC Polynomial register value.
+ */
+uint16_t SPI_GetCRCPolynomial(SPI_TypeDef *SPIx)
+{
+    return SPIx->CRCR;
+}
+
+/*********************************************************************
+ * @fn      SPI_BiDirectionalLineConfig
+ *
+ * @brief   Selects the data transfer direction in bi-directional mode
+ *      for the specified SPI.
+ *
+ * @param   SPIx - where x can be 1, 2 or 3 to select the SPI peripheral.
+ *          SPI_Direction - specifies the data transfer direction in
+ *        bi-directional mode.
+ *            SPI_Direction_Tx - Selects Tx transmission direction.
+ *            SPI_Direction_Rx - Selects Rx receive direction.
+ *
+ * @return  none
+ */
+void SPI_BiDirectionalLineConfig(SPI_TypeDef *SPIx, uint16_t SPI_Direction)
+{
+    if(SPI_Direction == SPI_Direction_Tx)
+    {
+        SPIx->CTLR1 |= SPI_Direction_Tx;
+    }
+    else
+    {
+        SPIx->CTLR1 &= SPI_Direction_Rx;
+    }
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_GetFlagStatus
+ *
+ * @brief   Checks whether the specified SPI/I2S flag is set or not.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *            - 2 or 3 in I2S mode.
+ *          SPI_I2S_FLAG - specifies the SPI/I2S flag to check.
+ *            SPI_I2S_FLAG_TXE - Transmit buffer empty flag.
+ *            SPI_I2S_FLAG_RXNE - Receive buffer not empty flag.
+ *            SPI_I2S_FLAG_BSY - Busy flag.
+ *            SPI_I2S_FLAG_OVR - Overrun flag.
+ *            SPI_FLAG_MODF - Mode Fault flag.
+ *            SPI_FLAG_CRCERR - CRC Error flag.
+ *            I2S_FLAG_UDR - Underrun Error flag.
+ *            I2S_FLAG_CHSIDE - Channel Side flag.
+ *
+ * @return  FlagStatus: SET or RESET.
+ */
+FlagStatus SPI_I2S_GetFlagStatus(SPI_TypeDef *SPIx, uint16_t SPI_I2S_FLAG)
+{
+    FlagStatus bitstatus = RESET;
+
+    if((SPIx->STATR & SPI_I2S_FLAG) != (uint16_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_ClearFlag
+ *
+ * @brief   Clears the SPIx CRC Error (CRCERR) flag.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *            - 2 or 3 in I2S mode.
+ *          SPI_I2S_FLAG - specifies the SPI flag to clear.
+ *            SPI_FLAG_CRCERR - CRC Error flag.
+ *          Note-
+ *          - OVR (OverRun error) flag is cleared by software sequence: a read 
+ *          operation to SPI_DATAR register (SPI_I2S_ReceiveData()) followed by a read 
+ *          operation to SPI_STATR register (SPI_I2S_GetFlagStatus()).
+ *          - UDR (UnderRun error) flag is cleared by a read operation to 
+ *          SPI_STATR register (SPI_I2S_GetFlagStatus()).
+ *          - MODF (Mode Fault) flag is cleared by software sequence: a read/write 
+ *          operation to SPI_STATR register (SPI_I2S_GetFlagStatus()) followed by a 
+ *          write operation to SPI_CTLR1 register (SPI_Cmd() to enable the SPI).
+ * @return  FlagStatus: SET or RESET.
+ */
+void SPI_I2S_ClearFlag(SPI_TypeDef *SPIx, uint16_t SPI_I2S_FLAG)
+{
+    SPIx->STATR = (uint16_t)~SPI_I2S_FLAG;
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_GetITStatus
+ *
+ * @brief   Checks whether the specified SPI/I2S interrupt has occurred or not.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *            - 2 or 3 in I2S mode.
+ *          SPI_I2S_IT - specifies the SPI/I2S interrupt source to check..
+ *            SPI_I2S_IT_TXE - Transmit buffer empty interrupt.
+ *            SPI_I2S_IT_RXNE - Receive buffer not empty interrupt.
+ *            SPI_I2S_IT_OVR - Overrun interrupt.
+ *            SPI_IT_MODF - Mode Fault interrupt.
+ *            SPI_IT_CRCERR - CRC Error interrupt.
+ *            I2S_IT_UDR - Underrun Error interrupt.
+ *
+ * @return  FlagStatus: SET or RESET.
+ */
+ITStatus SPI_I2S_GetITStatus(SPI_TypeDef *SPIx, uint8_t SPI_I2S_IT)
+{
+    ITStatus bitstatus = RESET;
+    uint16_t itpos = 0, itmask = 0, enablestatus = 0;
+
+    itpos = 0x01 << (SPI_I2S_IT & 0x0F);
+    itmask = SPI_I2S_IT >> 4;
+    itmask = 0x01 << itmask;
+    enablestatus = (SPIx->CTLR2 & itmask);
+
+    if(((SPIx->STATR & itpos) != (uint16_t)RESET) && enablestatus)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      SPI_I2S_ClearITPendingBit
+ *
+ * @brief   Clears the SPIx CRC Error (CRCERR) interrupt pending bit.
+ *
+ * @param   SPIx - where x can be
+ *            - 1, 2 or 3 in SPI mode.
+ *          SPI_I2S_IT - specifies the SPI interrupt pending bit to clear.
+ *            SPI_IT_CRCERR - CRC Error interrupt.
+ *         Note-
+ *         - OVR (OverRun Error) interrupt pending bit is cleared by software 
+ *         sequence: a read operation to SPI_DATAR register (SPI_I2S_ReceiveData()) 
+ *         followed by a read operation to SPI_STATR register (SPI_I2S_GetITStatus()).
+ *         - UDR (UnderRun Error) interrupt pending bit is cleared by a read 
+ *         operation to SPI_STATR register (SPI_I2S_GetITStatus()).
+ *         - MODF (Mode Fault) interrupt pending bit is cleared by software sequence:
+ *         a read/write operation to SPI_STATR register (SPI_I2S_GetITStatus()) 
+ *         followed by a write operation to SPI_CTLR1 register (SPI_Cmd() to enable 
+ *         the SPI).      
+ * @return  none
+ */
+void SPI_I2S_ClearITPendingBit(SPI_TypeDef *SPIx, uint8_t SPI_I2S_IT)
+{
+    uint16_t itpos = 0;
+
+    itpos = 0x01 << (SPI_I2S_IT & 0x0F);
+    SPIx->STATR = (uint16_t)~itpos;
+}

src/peripheral/src/ch32v20x_usart.c

@@ -0,0 +1,740 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_usart.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2024/01/06
+ * Description        : This file provides all the USART firmware functions.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x_usart.h"
+#include "ch32v20x_rcc.h"
+
+/* USART_Private_Defines */
+#define CTLR1_UE_Set              ((uint16_t)0x2000) /* USART Enable Mask */
+#define CTLR1_UE_Reset            ((uint16_t)0xDFFF) /* USART Disable Mask */
+
+#define CTLR1_WAKE_Mask           ((uint16_t)0xF7FF) /* USART WakeUp Method Mask */
+
+#define CTLR1_RWU_Set             ((uint16_t)0x0002) /* USART mute mode Enable Mask */
+#define CTLR1_RWU_Reset           ((uint16_t)0xFFFD) /* USART mute mode Enable Mask */
+#define CTLR1_SBK_Set             ((uint16_t)0x0001) /* USART Break Character send Mask */
+#define CTLR1_CLEAR_Mask          ((uint16_t)0xE9F3) /* USART CTLR1 Mask */
+#define CTLR2_Address_Mask        ((uint16_t)0xFFF0) /* USART address Mask */
+
+#define CTLR2_LINEN_Set           ((uint16_t)0x4000) /* USART LIN Enable Mask */
+#define CTLR2_LINEN_Reset         ((uint16_t)0xBFFF) /* USART LIN Disable Mask */
+
+#define CTLR2_LBDL_Mask           ((uint16_t)0xFFDF) /* USART LIN Break detection Mask */
+#define CTLR2_STOP_CLEAR_Mask     ((uint16_t)0xCFFF) /* USART CTLR2 STOP Bits Mask */
+#define CTLR2_CLOCK_CLEAR_Mask    ((uint16_t)0xF0FF) /* USART CTLR2 Clock Mask */
+
+#define CTLR3_SCEN_Set            ((uint16_t)0x0020) /* USART SC Enable Mask */
+#define CTLR3_SCEN_Reset          ((uint16_t)0xFFDF) /* USART SC Disable Mask */
+
+#define CTLR3_NACK_Set            ((uint16_t)0x0010) /* USART SC NACK Enable Mask */
+#define CTLR3_NACK_Reset          ((uint16_t)0xFFEF) /* USART SC NACK Disable Mask */
+
+#define CTLR3_HDSEL_Set           ((uint16_t)0x0008) /* USART Half-Duplex Enable Mask */
+#define CTLR3_HDSEL_Reset         ((uint16_t)0xFFF7) /* USART Half-Duplex Disable Mask */
+
+#define CTLR3_IRLP_Mask           ((uint16_t)0xFFFB) /* USART IrDA LowPower mode Mask */
+#define CTLR3_CLEAR_Mask          ((uint16_t)0xFCFF) /* USART CTLR3 Mask */
+
+#define CTLR3_IREN_Set            ((uint16_t)0x0002) /* USART IrDA Enable Mask */
+#define CTLR3_IREN_Reset          ((uint16_t)0xFFFD) /* USART IrDA Disable Mask */
+#define GPR_LSB_Mask              ((uint16_t)0x00FF) /* Guard Time Register LSB Mask */
+#define GPR_MSB_Mask              ((uint16_t)0xFF00) /* Guard Time Register MSB Mask */
+#define IT_Mask                   ((uint16_t)0x001F) /* USART Interrupt Mask */
+
+/*********************************************************************
+ * @fn      USART_DeInit
+ *
+ * @brief   Deinitializes the USARTx peripheral registers to their default
+ *        reset values.
+ *
+ * @param   USARTx - where x can be 1, 2 or 3 to select the UART peripheral.
+ *
+ * @return  none
+ */
+void USART_DeInit(USART_TypeDef *USARTx)
+{
+    if(USARTx == USART1)
+    {
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
+        RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
+    }
+    else if(USARTx == USART2)
+    {
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
+    }
+    else if(USARTx == USART3)
+    {
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
+    }
+    else if(USARTx == UART4)
+    {
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
+        RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_Init
+ *
+ * @brief   Initializes the USARTx peripheral according to the specified
+ *        parameters in the USART_InitStruct.
+ *
+ * @param   USARTx - where x can be 1, 2 or 3 to select the UART peripheral.
+ *          USART_InitStruct - pointer to a USART_InitTypeDef structure
+ *        that contains the configuration information for the specified
+ *        USART peripheral.
+ *
+ * @return  none
+ */
+void USART_Init(USART_TypeDef *USARTx, USART_InitTypeDef *USART_InitStruct)
+{
+    uint32_t          tmpreg = 0x00, apbclock = 0x00;
+    uint32_t          integerdivider = 0x00;
+    uint32_t          fractionaldivider = 0x00;
+    uint32_t          usartxbase = 0;
+    RCC_ClocksTypeDef RCC_ClocksStatus;
+
+    if(USART_InitStruct->USART_HardwareFlowControl != USART_HardwareFlowControl_None)
+    {
+    }
+
+    usartxbase = (uint32_t)USARTx;
+    tmpreg = USARTx->CTLR2;
+    tmpreg &= CTLR2_STOP_CLEAR_Mask;
+    tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;
+
+    USARTx->CTLR2 = (uint16_t)tmpreg;
+    tmpreg = USARTx->CTLR1;
+    tmpreg &= CTLR1_CLEAR_Mask;
+    tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
+              USART_InitStruct->USART_Mode;
+    USARTx->CTLR1 = (uint16_t)tmpreg;
+
+    tmpreg = USARTx->CTLR3;
+    tmpreg &= CTLR3_CLEAR_Mask;
+    tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
+    USARTx->CTLR3 = (uint16_t)tmpreg;
+
+    RCC_GetClocksFreq(&RCC_ClocksStatus);
+
+    if(usartxbase == USART1_BASE)
+    {
+        apbclock = RCC_ClocksStatus.PCLK2_Frequency;
+    }
+    else
+    {
+        apbclock = RCC_ClocksStatus.PCLK1_Frequency;
+    }
+    integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate)));
+    tmpreg = (integerdivider / 100) << 4;
+    fractionaldivider = integerdivider - (100 * (tmpreg >> 4));
+    tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);
+    USARTx->BRR = (uint16_t)tmpreg;
+}
+
+/*********************************************************************
+ * @fn      USART_StructInit
+ *
+ * @brief   Fills each USART_InitStruct member with its default value.
+ *
+ * @param   USART_InitStruct: pointer to a USART_InitTypeDef structure
+ *       which will be initialized.
+ *
+ * @return  none
+ */
+void USART_StructInit(USART_InitTypeDef *USART_InitStruct)
+{
+    USART_InitStruct->USART_BaudRate = 9600;
+    USART_InitStruct->USART_WordLength = USART_WordLength_8b;
+    USART_InitStruct->USART_StopBits = USART_StopBits_1;
+    USART_InitStruct->USART_Parity = USART_Parity_No;
+    USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+    USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+}
+
+/*********************************************************************
+ * @fn      USART_ClockInit
+ *
+ * @brief   Initializes the USARTx peripheral Clock according to the
+ *        specified parameters in the USART_ClockInitStruct .
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_ClockInitStruct - pointer to a USART_ClockInitTypeDef
+ *        structure that contains the configuration information for the specified
+ *        USART peripheral.
+ *
+ * @return  none
+ */
+void USART_ClockInit(USART_TypeDef *USARTx, USART_ClockInitTypeDef *USART_ClockInitStruct)
+{
+    uint32_t tmpreg = 0x00;
+
+    tmpreg = USARTx->CTLR2;
+    tmpreg &= CTLR2_CLOCK_CLEAR_Mask;
+    tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
+              USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
+    USARTx->CTLR2 = (uint16_t)tmpreg;
+}
+
+/*********************************************************************
+ * @fn      USART_ClockStructInit
+ *
+ * @brief   Fills each USART_ClockStructInit member with its default value.
+ *
+ * @param   USART_ClockInitStruct - pointer to a USART_ClockInitTypeDef
+ *        structure which will be initialized.
+ *
+ * @return  none
+ */
+void USART_ClockStructInit(USART_ClockInitTypeDef *USART_ClockInitStruct)
+{
+    USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
+    USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
+    USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
+    USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
+}
+
+/*********************************************************************
+ * @fn      USART_Cmd
+ *
+ * @brief   Enables or disables the specified USART peripheral.
+ *        reset values (Affects also the I2Ss).
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          NewState: ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_Cmd(USART_TypeDef *USARTx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR1 |= CTLR1_UE_Set;
+    }
+    else
+    {
+        USARTx->CTLR1 &= CTLR1_UE_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_ITConfig
+ *
+ * @brief   Enables or disables the specified USART interrupts.
+ *        reset values (Affects also the I2Ss).
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_IT - specifies the USART interrupt sources to be enabled or disabled.
+ *            USART_IT_LBD - LIN Break detection interrupt.
+ *            USART_IT_TXE - Transmit Data Register empty interrupt.
+ *            USART_IT_TC - Transmission complete interrupt.
+ *            USART_IT_RXNE - Receive Data register not empty interrupt.
+ *            USART_IT_IDLE - Idle line detection interrupt.
+ *            USART_IT_PE - Parity Error interrupt.
+ *            USART_IT_ERR - Error interrupt.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_ITConfig(USART_TypeDef *USARTx, uint16_t USART_IT, FunctionalState NewState)
+{
+    uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;
+    uint32_t usartxbase = 0x00;
+
+
+    usartxbase = (uint32_t)USARTx;
+    usartreg = (((uint8_t)USART_IT) >> 0x05);
+    itpos = USART_IT & IT_Mask;
+    itmask = (((uint32_t)0x01) << itpos);
+
+    if(usartreg == 0x01)
+    {
+        usartxbase += 0x0C;
+    }
+    else if(usartreg == 0x02)
+    {
+        usartxbase += 0x10;
+    }
+    else
+    {
+        usartxbase += 0x14;
+    }
+
+    if(NewState != DISABLE)
+    {
+        *(__IO uint32_t *)usartxbase |= itmask;
+    }
+    else
+    {
+        *(__IO uint32_t *)usartxbase &= ~itmask;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_DMACmd
+ *
+ * @brief   Enables or disables the USART DMA interface.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_DMAReq - specifies the DMA request.
+ *            USART_DMAReq_Tx - USART DMA transmit request.
+ *            USART_DMAReq_Rx - USART DMA receive request.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_DMACmd(USART_TypeDef *USARTx, uint16_t USART_DMAReq, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR3 |= USART_DMAReq;
+    }
+    else
+    {
+        USARTx->CTLR3 &= (uint16_t)~USART_DMAReq;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_SetAddress
+ *
+ * @brief   Sets the address of the USART node.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_Address - Indicates the address of the USART node.
+ *
+ * @return  none
+ */
+void USART_SetAddress(USART_TypeDef *USARTx, uint8_t USART_Address)
+{
+    USARTx->CTLR2 &= CTLR2_Address_Mask;
+    USARTx->CTLR2 |= USART_Address;
+}
+
+/*********************************************************************
+ * @fn      USART_WakeUpConfig
+ *
+ * @brief   Selects the USART WakeUp method.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_WakeUp - specifies the USART wakeup method.
+ *            USART_WakeUp_IdleLine - WakeUp by an idle line detection.
+ *            USART_WakeUp_AddressMark - WakeUp by an address mark.
+ *
+ * @return  none
+ */
+void USART_WakeUpConfig(USART_TypeDef *USARTx, uint16_t USART_WakeUp)
+{
+    USARTx->CTLR1 &= CTLR1_WAKE_Mask;
+    USARTx->CTLR1 |= USART_WakeUp;
+}
+
+/*********************************************************************
+ * @fn      USART_ReceiverWakeUpCmd
+ *
+ * @brief   Determines if the USART is in mute mode or not.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_ReceiverWakeUpCmd(USART_TypeDef *USARTx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR1 |= CTLR1_RWU_Set;
+    }
+    else
+    {
+        USARTx->CTLR1 &= CTLR1_RWU_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_LINBreakDetectLengthConfig
+ *
+ * @brief   Sets the USART LIN Break detection length.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_LINBreakDetectLength - specifies the LIN break detection length.
+ *            USART_LINBreakDetectLength_10b - 10-bit break detection.
+ *            USART_LINBreakDetectLength_11b - 11-bit break detection.
+ *
+ * @return  none
+ */
+void USART_LINBreakDetectLengthConfig(USART_TypeDef *USARTx, uint16_t USART_LINBreakDetectLength)
+{
+    USARTx->CTLR2 &= CTLR2_LBDL_Mask;
+    USARTx->CTLR2 |= USART_LINBreakDetectLength;
+}
+
+/*********************************************************************
+ * @fn      USART_LINCmd
+ *
+ * @brief   Enables or disables the USART LIN mode.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_LINCmd(USART_TypeDef *USARTx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR2 |= CTLR2_LINEN_Set;
+    }
+    else
+    {
+        USARTx->CTLR2 &= CTLR2_LINEN_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_SendData
+ *
+ * @brief   Transmits single data through the USARTx peripheral.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          Data - the data to transmit.
+ *
+ * @return  none
+ */
+void USART_SendData(USART_TypeDef *USARTx, uint16_t Data)
+{
+    USARTx->DATAR = (Data & (uint16_t)0x01FF);
+}
+
+/*********************************************************************
+ * @fn      USART_ReceiveData
+ *
+ * @brief   Returns the most recent received data by the USARTx peripheral.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *
+ * @return  The received data.
+ */
+uint16_t USART_ReceiveData(USART_TypeDef *USARTx)
+{
+    return (uint16_t)(USARTx->DATAR & (uint16_t)0x01FF);
+}
+
+/*********************************************************************
+ * @fn      USART_SendBreak
+ *
+ * @brief   Transmits break characters.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *
+ * @return  none
+ */
+void USART_SendBreak(USART_TypeDef *USARTx)
+{
+    USARTx->CTLR1 |= CTLR1_SBK_Set;
+}
+
+/*********************************************************************
+ * @fn      USART_SetGuardTime
+ *
+ * @brief   Sets the specified USART guard time.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_GuardTime - specifies the guard time.
+ *
+ * @return  none
+ */
+void USART_SetGuardTime(USART_TypeDef *USARTx, uint8_t USART_GuardTime)
+{
+    USARTx->GPR &= GPR_LSB_Mask;
+    USARTx->GPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
+}
+
+/*********************************************************************
+ * @fn      USART_SetPrescaler
+ *
+ * @brief   Sets the system clock prescaler.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_Prescaler - specifies the prescaler clock.
+ *
+ * @return  none
+ */
+void USART_SetPrescaler(USART_TypeDef *USARTx, uint8_t USART_Prescaler)
+{
+    USARTx->GPR &= GPR_MSB_Mask;
+    USARTx->GPR |= USART_Prescaler;
+}
+
+/*********************************************************************
+ * @fn      USART_SmartCardCmd
+ *
+ * @brief   Enables or disables the USART Smart Card mode.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_SmartCardCmd(USART_TypeDef *USARTx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR3 |= CTLR3_SCEN_Set;
+    }
+    else
+    {
+        USARTx->CTLR3 &= CTLR3_SCEN_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_SmartCardNACKCmd
+ *
+ * @brief   Enables or disables NACK transmission.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_SmartCardNACKCmd(USART_TypeDef *USARTx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR3 |= CTLR3_NACK_Set;
+    }
+    else
+    {
+        USARTx->CTLR3 &= CTLR3_NACK_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_HalfDuplexCmd
+ *
+ * @brief   Enables or disables the USART Half Duplex communication.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *                  NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_HalfDuplexCmd(USART_TypeDef *USARTx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR3 |= CTLR3_HDSEL_Set;
+    }
+    else
+    {
+        USARTx->CTLR3 &= CTLR3_HDSEL_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_IrDAConfig
+ *
+ * @brief   Configures the USART's IrDA interface.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_IrDAMode - specifies the IrDA mode.
+ *            USART_IrDAMode_LowPower.
+ *            USART_IrDAMode_Normal.
+ *
+ * @return  none
+ */
+void USART_IrDAConfig(USART_TypeDef *USARTx, uint16_t USART_IrDAMode)
+{
+    USARTx->CTLR3 &= CTLR3_IRLP_Mask;
+    USARTx->CTLR3 |= USART_IrDAMode;
+}
+
+/*********************************************************************
+ * @fn      USART_IrDACmd
+ *
+ * @brief   Enables or disables the USART's IrDA interface.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          NewState - ENABLE or DISABLE.
+ *
+ * @return  none
+ */
+void USART_IrDACmd(USART_TypeDef *USARTx, FunctionalState NewState)
+{
+    if(NewState != DISABLE)
+    {
+        USARTx->CTLR3 |= CTLR3_IREN_Set;
+    }
+    else
+    {
+        USARTx->CTLR3 &= CTLR3_IREN_Reset;
+    }
+}
+
+/*********************************************************************
+ * @fn      USART_GetFlagStatus
+ *
+ * @brief   Checks whether the specified USART flag is set or not.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_FLAG - specifies the flag to check.
+ *            USART_FLAG_LBD - LIN Break detection flag.
+ *            USART_FLAG_TXE - Transmit data register empty flag.
+ *            USART_FLAG_TC - Transmission Complete flag.
+ *            USART_FLAG_RXNE - Receive data register not empty flag.
+ *            USART_FLAG_IDLE - Idle Line detection flag.
+ *            USART_FLAG_ORE - OverRun Error flag.
+ *            USART_FLAG_NE - Noise Error flag.
+ *            USART_FLAG_FE - Framing Error flag.
+ *            USART_FLAG_PE - Parity Error flag.
+ *
+ * @return  bitstatus: SET or RESET
+ */
+FlagStatus USART_GetFlagStatus(USART_TypeDef *USARTx, uint16_t USART_FLAG)
+{
+    FlagStatus bitstatus = RESET;
+
+
+    if((USARTx->STATR & USART_FLAG) != (uint16_t)RESET)
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      USART_ClearFlag
+ *
+ * @brief   Clears the USARTx's pending flags.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_FLAG - specifies the flag to clear.
+ *            USART_FLAG_LBD - LIN Break detection flag.
+ *            USART_FLAG_TC - Transmission Complete flag.
+ *            USART_FLAG_RXNE - Receive data register not empty flag.
+ *          Note-
+ *            - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun 
+ *            error) and IDLE (Idle line detected) flags are cleared by software 
+ *            sequence: a read operation to USART_STATR register (USART_GetFlagStatus()) 
+ *            followed by a read operation to USART_DATAR register (USART_ReceiveData()).
+ *            - RXNE flag can be also cleared by a read to the USART_DATAR register 
+ *            (USART_ReceiveData()).
+ *            - TC flag can be also cleared by software sequence: a read operation to 
+ *            USART_STATR register (USART_GetFlagStatus()) followed by a write operation
+ *            to USART_DATAR register (USART_SendData()).
+ *            - TXE flag is cleared only by a write to the USART_DATAR register 
+ *            (USART_SendData()).
+ * @return  none
+ */
+void USART_ClearFlag(USART_TypeDef *USARTx, uint16_t USART_FLAG)
+{
+
+    USARTx->STATR = (uint16_t)~USART_FLAG;
+}
+
+/*********************************************************************
+ * @fn      USART_GetITStatus
+ *
+ * @brief   Checks whether the specified USART interrupt has occurred or not.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_IT - specifies the USART interrupt source to check.
+ *            USART_IT_LBD - LIN Break detection interrupt.
+ *            USART_IT_TXE - Tansmit Data Register empty interrupt.
+ *            USART_IT_TC - Transmission complete interrupt.
+ *            USART_IT_RXNE - Receive Data register not empty interrupt.
+ *            USART_IT_IDLE - Idle line detection interrupt.
+ *            USART_IT_ORE_RX - OverRun Error interrupt if the RXNEIE bit is set.
+ *            USART_IT_ORE_ER - OverRun Error interrupt if the EIE bit is set.
+ *            USART_IT_NE - Noise Error interrupt.
+ *            USART_IT_FE - Framing Error interrupt.
+ *            USART_IT_PE - Parity Error interrupt.
+ *
+ * @return  bitstatus: SET or RESET.
+ */
+ITStatus USART_GetITStatus(USART_TypeDef *USARTx, uint16_t USART_IT)
+{
+    uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
+    ITStatus bitstatus = RESET;
+
+    usartreg = (((uint8_t)USART_IT) >> 0x05);
+    itmask = USART_IT & IT_Mask;
+    itmask = (uint32_t)0x01 << itmask;
+
+    if(usartreg == 0x01)
+    {
+        itmask &= USARTx->CTLR1;
+    }
+    else if(usartreg == 0x02)
+    {
+        itmask &= USARTx->CTLR2;
+    }
+    else
+    {
+        itmask &= USARTx->CTLR3;
+    }
+
+    bitpos = USART_IT >> 0x08;
+    bitpos = (uint32_t)0x01 << bitpos;
+    bitpos &= USARTx->STATR;
+
+    if((itmask != (uint16_t)RESET) && (bitpos != (uint16_t)RESET))
+    {
+        bitstatus = SET;
+    }
+    else
+    {
+        bitstatus = RESET;
+    }
+
+    return bitstatus;
+}
+
+/*********************************************************************
+ * @fn      USART_ClearITPendingBit
+ *
+ * @brief   Clears the USARTx's interrupt pending bits.
+ *
+ * @param   USARTx - where x can be 1, 2, 3 to select the USART peripheral.
+ *          USART_IT - specifies the interrupt pending bit to clear.
+ *            USART_IT_LBD - LIN Break detection interrupt.
+ *            USART_IT_TC - Transmission complete interrupt.
+ *            USART_IT_RXNE - Receive Data register not empty interrupt.
+ *         Note-
+ *            - PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun 
+ *            error) and IDLE (Idle line detected) pending bits are cleared by 
+ *            software sequence: a read operation to USART_STATR register 
+ *            (USART_GetITStatus()) followed by a read operation to USART_DATAR register 
+ *            (USART_ReceiveData()).
+ *            - RXNE pending bit can be also cleared by a read to the USART_DATAR register 
+ *            (USART_ReceiveData()).
+ *            - TC pending bit can be also cleared by software sequence: a read 
+ *            operation to USART_STATR register (USART_GetITStatus()) followed by a write 
+ *            operation to USART_DATAR register (USART_SendData()).
+ *            - TXE pending bit is cleared only by a write to the USART_DATAR register 
+ *            (USART_SendData()).
+ * @return  none
+ */
+void USART_ClearITPendingBit(USART_TypeDef *USARTx, uint16_t USART_IT)
+{
+    uint16_t bitpos = 0x00, itmask = 0x00;
+
+    bitpos = USART_IT >> 0x08;
+    itmask = ((uint16_t)0x01 << (uint16_t)bitpos);
+    USARTx->STATR = (uint16_t)~itmask;
+}

src/peripheral/src/ch32v20x_wwdg.c

@@ -0,0 +1,141 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : ch32v20x_wwdg.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : This file provides all the WWDG firmware functions.
+ *********************************************************************************
+ * Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+ * Attention: This software (modified or not) and binary are used for 
+ * microcontroller manufactured by Nanjing Qinheng Microelectronics.
+ *******************************************************************************/
+#include "ch32v20x_wwdg.h"
+#include "ch32v20x_rcc.h"
+
+/* CTLR register bit mask */
+#define CTLR_WDGA_Set      ((uint32_t)0x00000080)
+
+/* CFGR register bit mask */
+#define CFGR_WDGTB_Mask    ((uint32_t)0xFFFFFE7F)
+#define CFGR_W_Mask        ((uint32_t)0xFFFFFF80)
+#define BIT_Mask           ((uint8_t)0x7F)
+
+/*********************************************************************
+ * @fn      WWDG_DeInit
+ *
+ * @brief   Deinitializes the WWDG peripheral registers to their default reset values
+ *
+ * @return  none
+ */
+void WWDG_DeInit(void)
+{
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, ENABLE);
+    RCC_APB1PeriphResetCmd(RCC_APB1Periph_WWDG, DISABLE);
+}
+
+/*********************************************************************
+ * @fn      WWDG_SetPrescaler
+ *
+ * @brief   Sets the WWDG Prescaler
+ *
+ * @param   WWDG_Prescaler - specifies the WWDG Prescaler
+ *            WWDG_Prescaler_1 - WWDG counter clock = (PCLK1/4096)/1
+ *            WWDG_Prescaler_2 - WWDG counter clock = (PCLK1/4096)/2
+ *            WWDG_Prescaler_4 - WWDG counter clock = (PCLK1/4096)/4
+ *            WWDG_Prescaler_8 - WWDG counter clock = (PCLK1/4096)/8
+ *
+ * @return  none
+ */
+void WWDG_SetPrescaler(uint32_t WWDG_Prescaler)
+{
+    uint32_t tmpreg = 0;
+    tmpreg = WWDG->CFGR & CFGR_WDGTB_Mask;
+    tmpreg |= WWDG_Prescaler;
+    WWDG->CFGR = tmpreg;
+}
+
+/*********************************************************************
+ * @fn      WWDG_SetWindowValue
+ *
+ * @brief   Sets the WWDG window value
+ *
+ * @param   WindowValue - specifies the window value to be compared to the
+ *        downcounter,which must be lower than 0x80
+ *
+ * @return  none
+ */
+void WWDG_SetWindowValue(uint8_t WindowValue)
+{
+    __IO uint32_t tmpreg = 0;
+
+    tmpreg = WWDG->CFGR & CFGR_W_Mask;
+
+    tmpreg |= WindowValue & (uint32_t)BIT_Mask;
+
+    WWDG->CFGR = tmpreg;
+}
+
+/*********************************************************************
+ * @fn      WWDG_EnableIT
+ *
+ * @brief   Enables the WWDG Early Wakeup interrupt(EWI)
+ *
+ * @return  none
+ */
+void WWDG_EnableIT(void)
+{
+    WWDG->CFGR |= (1 << 9);
+}
+
+/*********************************************************************
+ * @fn      WWDG_SetCounter
+ *
+ * @brief   Sets the WWDG counter value
+ *
+ * @param   Counter - specifies the watchdog counter value,which must be a
+ *        number between 0x40 and 0x7F
+ *
+ * @return  none
+ */
+void WWDG_SetCounter(uint8_t Counter)
+{
+    WWDG->CTLR = Counter & BIT_Mask;
+}
+
+/*********************************************************************
+ * @fn      WWDG_Enable
+ *
+ * @brief   Enables WWDG and load the counter value
+ *
+ * @param   Counter - specifies the watchdog counter value,which must be a
+ *        number between 0x40 and 0x7F
+ * @return  none
+ */
+void WWDG_Enable(uint8_t Counter)
+{
+    WWDG->CTLR = CTLR_WDGA_Set | Counter;
+}
+
+/*********************************************************************
+ * @fn      WWDG_GetFlagStatus
+ *
+ * @brief   Checks whether the Early Wakeup interrupt flag is set or not
+ *
+ * @return  The new state of the Early Wakeup interrupt flag (SET or RESET)
+ */
+FlagStatus WWDG_GetFlagStatus(void)
+{
+    return (FlagStatus)(WWDG->STATR);
+}
+
+/*********************************************************************
+ * @fn      WWDG_ClearFlag
+ *
+ * @brief   Clears Early Wakeup interrupt flag
+ *
+ * @return  none
+ */
+void WWDG_ClearFlag(void)
+{
+    WWDG->STATR = (uint32_t)RESET;
+}

src/startup/startup_ch32v20x_D6.S

@@ -0,0 +1,254 @@
+;/********************************** (C) COPYRIGHT *******************************
+;* File Name          : startup_ch32v20x_D6.s
+;* Author             : WCH
+;* Version            : V1.0.1
+;* Date               : 2024/01/31
+;* Description        :  CH32V203F6-CH32V203F8-CH32V203G6-CH32V203G8-CH32V203K8-CH32V203C6-CH32V203C8-CH32V203G8
+;*                    vector table for eclipse toolchain.
+;*********************************************************************************
+;* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+;* Attention: This software (modified or not) and binary are used for 
+;* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+
+	.section	.init,"ax",@progbits
+	.global	_start
+	.align	1
+_start:
+	j	handle_reset
+
+    .section    .vector,"ax",@progbits
+    .align  1
+_vector_base:
+    .option norvc;
+    .word   _start
+    .word   0
+    .word   NMI_Handler                /* NMI */
+    .word   HardFault_Handler          /* Hard Fault */
+    .word   0
+    .word   Ecall_M_Mode_Handler       /* Ecall M Mode */
+    .word   0
+    .word   0
+    .word   Ecall_U_Mode_Handler       /* Ecall U Mode */
+    .word   Break_Point_Handler        /* Break Point */
+    .word   0
+    .word   0
+    .word   SysTick_Handler            /* SysTick */
+    .word   0
+    .word   SW_Handler                 /* SW */
+    .word   0
+    /* External Interrupts */
+    .word   WWDG_IRQHandler            /* Window Watchdog */
+    .word   PVD_IRQHandler             /* PVD through EXTI Line detect */
+    .word   TAMPER_IRQHandler          /* TAMPER */
+    .word   RTC_IRQHandler             /* RTC */
+    .word   FLASH_IRQHandler           /* Flash */
+    .word   RCC_IRQHandler             /* RCC */
+    .word   EXTI0_IRQHandler           /* EXTI Line 0 */
+    .word   EXTI1_IRQHandler           /* EXTI Line 1 */
+    .word   EXTI2_IRQHandler           /* EXTI Line 2 */
+    .word   EXTI3_IRQHandler           /* EXTI Line 3 */
+    .word   EXTI4_IRQHandler           /* EXTI Line 4 */
+    .word   DMA1_Channel1_IRQHandler   /* DMA1 Channel 1 */
+    .word   DMA1_Channel2_IRQHandler   /* DMA1 Channel 2 */
+    .word   DMA1_Channel3_IRQHandler   /* DMA1 Channel 3 */
+    .word   DMA1_Channel4_IRQHandler   /* DMA1 Channel 4 */
+    .word   DMA1_Channel5_IRQHandler   /* DMA1 Channel 5 */
+    .word   DMA1_Channel6_IRQHandler   /* DMA1 Channel 6 */
+    .word   DMA1_Channel7_IRQHandler   /* DMA1 Channel 7 */
+    .word   ADC1_2_IRQHandler          /* ADC1_2 */
+    .word   USB_HP_CAN1_TX_IRQHandler  /* USB HP and CAN1 TX */
+    .word   USB_LP_CAN1_RX0_IRQHandler /* USB LP and CAN1RX0 */
+    .word   CAN1_RX1_IRQHandler        /* CAN1 RX1 */
+    .word   CAN1_SCE_IRQHandler        /* CAN1 SCE */
+    .word   EXTI9_5_IRQHandler         /* EXTI Line 9..5 */
+    .word   TIM1_BRK_IRQHandler        /* TIM1 Break */
+    .word   TIM1_UP_IRQHandler         /* TIM1 Update */
+    .word   TIM1_TRG_COM_IRQHandler    /* TIM1 Trigger and Commutation */
+    .word   TIM1_CC_IRQHandler         /* TIM1 Capture Compare */
+    .word   TIM2_IRQHandler            /* TIM2 */
+    .word   TIM3_IRQHandler            /* TIM3 */
+    .word   TIM4_IRQHandler            /* TIM4 */
+    .word   I2C1_EV_IRQHandler         /* I2C1 Event */
+    .word   I2C1_ER_IRQHandler         /* I2C1 Error */
+    .word   I2C2_EV_IRQHandler         /* I2C2 Event */
+    .word   I2C2_ER_IRQHandler         /* I2C2 Error */
+    .word   SPI1_IRQHandler            /* SPI1 */
+    .word   SPI2_IRQHandler            /* SPI2 */
+    .word   USART1_IRQHandler          /* USART1 */
+    .word   USART2_IRQHandler          /* USART2 */
+    .word   USART3_IRQHandler          /* USART3 */
+    .word   EXTI15_10_IRQHandler       /* EXTI Line 15..10 */
+    .word   RTCAlarm_IRQHandler        /* RTC Alarm through EXTI Line */
+    .word   USBWakeUp_IRQHandler       /* USB Wake up from suspend */
+    .word   USBFS_IRQHandler           /* USBFS Break */
+    .word   USBFSWakeUp_IRQHandler     /* USBFS Wake up from suspend */
+    .word   UART4_IRQHandler           /* UART4 */
+    .word   DMA1_Channel8_IRQHandler   /* DMA1 Channel8 */
+
+    .option rvc;
+    .section    .text.vector_handler, "ax", @progbits
+    .weak   NMI_Handler                /* NMI */
+    .weak   HardFault_Handler          /* Hard Fault */
+    .weak   Ecall_M_Mode_Handler       /* Ecall M Mode */
+    .weak   Ecall_U_Mode_Handler       /* Ecall U Mode */
+    .weak   Break_Point_Handler        /* Break Point */
+    .weak   SysTick_Handler            /* SysTick */
+    .weak   SW_Handler                 /* SW */
+    .weak   WWDG_IRQHandler            /* Window Watchdog */
+    .weak   PVD_IRQHandler             /* PVD through EXTI Line detect */
+    .weak   TAMPER_IRQHandler          /* TAMPER */
+    .weak   RTC_IRQHandler             /* RTC */
+    .weak   FLASH_IRQHandler           /* Flash */
+    .weak   RCC_IRQHandler             /* RCC */
+    .weak   EXTI0_IRQHandler           /* EXTI Line 0 */
+    .weak   EXTI1_IRQHandler           /* EXTI Line 1 */
+    .weak   EXTI2_IRQHandler           /* EXTI Line 2 */
+    .weak   EXTI3_IRQHandler           /* EXTI Line 3 */
+    .weak   EXTI4_IRQHandler           /* EXTI Line 4 */
+    .weak   DMA1_Channel1_IRQHandler   /* DMA1 Channel 1 */
+    .weak   DMA1_Channel2_IRQHandler   /* DMA1 Channel 2 */
+    .weak   DMA1_Channel3_IRQHandler   /* DMA1 Channel 3 */
+    .weak   DMA1_Channel4_IRQHandler   /* DMA1 Channel 4 */
+    .weak   DMA1_Channel5_IRQHandler   /* DMA1 Channel 5 */
+    .weak   DMA1_Channel6_IRQHandler   /* DMA1 Channel 6 */
+    .weak   DMA1_Channel7_IRQHandler   /* DMA1 Channel 7 */
+    .weak   ADC1_2_IRQHandler          /* ADC1_2 */
+    .weak   USB_HP_CAN1_TX_IRQHandler  /* USB HP and CAN1 TX */
+    .weak   USB_LP_CAN1_RX0_IRQHandler /* USB LP and CAN1RX0 */
+    .weak   CAN1_RX1_IRQHandler        /* CAN1 RX1 */
+    .weak   CAN1_SCE_IRQHandler        /* CAN1 SCE */
+    .weak   EXTI9_5_IRQHandler         /* EXTI Line 9..5 */
+    .weak   TIM1_BRK_IRQHandler        /* TIM1 Break */
+    .weak   TIM1_UP_IRQHandler         /* TIM1 Update */
+    .weak   TIM1_TRG_COM_IRQHandler    /* TIM1 Trigger and Commutation */
+    .weak   TIM1_CC_IRQHandler         /* TIM1 Capture Compare */
+    .weak   TIM2_IRQHandler            /* TIM2 */
+    .weak   TIM3_IRQHandler            /* TIM3 */
+    .weak   TIM4_IRQHandler            /* TIM4 */
+    .weak   I2C1_EV_IRQHandler         /* I2C1 Event */
+    .weak   I2C1_ER_IRQHandler         /* I2C1 Error */
+    .weak   I2C2_EV_IRQHandler         /* I2C2 Event */
+    .weak   I2C2_ER_IRQHandler         /* I2C2 Error */
+    .weak   SPI1_IRQHandler            /* SPI1 */
+    .weak   SPI2_IRQHandler            /* SPI2 */
+    .weak   USART1_IRQHandler          /* USART1 */
+    .weak   USART2_IRQHandler          /* USART2 */
+    .weak   USART3_IRQHandler          /* USART3 */
+    .weak   EXTI15_10_IRQHandler       /* EXTI Line 15..10 */
+    .weak   RTCAlarm_IRQHandler        /* RTC Alarm through EXTI Line */
+    .weak   USBWakeUp_IRQHandler       /* USB Wakeup from suspend */
+    .weak   USBFS_IRQHandler           /* USBFS */
+    .weak   USBFSWakeUp_IRQHandler     /* USBFS Wake Up */
+    .weak   UART4_IRQHandler           /* UART4 */
+    .weak   DMA1_Channel8_IRQHandler   /* DMA1 Channel8 */
+
+NMI_Handler:
+HardFault_Handler:
+Ecall_M_Mode_Handler:
+Ecall_U_Mode_Handler:
+Break_Point_Handler:
+SysTick_Handler:
+SW_Handler:
+WWDG_IRQHandler:
+PVD_IRQHandler:
+TAMPER_IRQHandler:
+RTC_IRQHandler:
+FLASH_IRQHandler:
+RCC_IRQHandler:
+EXTI0_IRQHandler:
+EXTI1_IRQHandler:
+EXTI2_IRQHandler:
+EXTI3_IRQHandler:
+EXTI4_IRQHandler:
+DMA1_Channel1_IRQHandler:
+DMA1_Channel2_IRQHandler:
+DMA1_Channel3_IRQHandler:
+DMA1_Channel4_IRQHandler:
+DMA1_Channel5_IRQHandler:
+DMA1_Channel6_IRQHandler:
+DMA1_Channel7_IRQHandler:
+ADC1_2_IRQHandler:
+USB_HP_CAN1_TX_IRQHandler:
+USB_LP_CAN1_RX0_IRQHandler:
+CAN1_RX1_IRQHandler:
+CAN1_SCE_IRQHandler:
+EXTI9_5_IRQHandler:
+TIM1_BRK_IRQHandler:
+TIM1_UP_IRQHandler:
+TIM1_TRG_COM_IRQHandler:
+TIM1_CC_IRQHandler:
+TIM2_IRQHandler:
+TIM3_IRQHandler:
+TIM4_IRQHandler:
+I2C1_EV_IRQHandler:
+I2C1_ER_IRQHandler:
+I2C2_EV_IRQHandler:
+I2C2_ER_IRQHandler:
+SPI1_IRQHandler:
+SPI2_IRQHandler:
+USART1_IRQHandler:
+USART2_IRQHandler:
+USART3_IRQHandler:
+EXTI15_10_IRQHandler:
+RTCAlarm_IRQHandler:
+USBWakeUp_IRQHandler:
+USBFS_IRQHandler:
+USBFSWakeUp_IRQHandler:
+UART4_IRQHandler:
+DMA1_Channel8_IRQHandler:
+1:
+	j 1b
+
+	.section	.text.handle_reset,"ax",@progbits
+	.weak	handle_reset
+	.align	1
+handle_reset:
+.option push 
+.option	norelax 
+	la gp, __global_pointer$
+.option	pop 
+1:
+	la sp, _eusrstack 
+2:
+/* Load data section from flash to RAM */
+	la a0, _data_lma
+	la a1, _data_vma
+	la a2, _edata
+	bgeu a1, a2, 2f
+1:
+	lw t0, (a0)
+	sw t0, (a1)
+	addi a0, a0, 4
+	addi a1, a1, 4
+	bltu a1, a2, 1b
+2:
+/* Clear bss section */
+	la a0, _sbss
+	la a1, _ebss
+	bgeu a0, a1, 2f
+1:
+	sw zero, (a0)
+	addi a0, a0, 4
+	bltu a0, a1, 1b
+2:
+/* Configure pipelining and instruction prediction */
+    li t0, 0x1f
+    csrw 0xbc0, t0
+/* Enable interrupt nesting and hardware stack */
+	li t0, 0x3
+	csrw 0x804, t0
+/* Enable global interrupt and configure privileged mode */
+   	li t0, 0x88           
+   	csrw mstatus, t0
+/* Configure the interrupt vector table recognition mode and entry address mode */
+ 	la t0, _vector_base
+    ori t0, t0, 3           
+	csrw mtvec, t0
+
+    jal  SystemInit
+	la t0, main
+	csrw mepc, t0
+	mret
+
+

src/startup/startup_ch32v20x_D8.S

@@ -0,0 +1,269 @@
+;/********************************** (C) COPYRIGHT *******************************
+;* File Name          : startup_ch32v20x_D8.s
+;* Author             : WCH
+;* Version            : V1.0.1
+;* Date               : 2024/01/31
+;* Description        : CH32V203RB
+;*                    vector table for eclipse toolchain.
+;*********************************************************************************
+;* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+;* Attention: This software (modified or not) and binary are used for 
+;* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+
+	.section	.init,"ax",@progbits
+	.global	_start
+	.align	1
+_start:
+	j	handle_reset
+
+    .section    .vector,"ax",@progbits
+    .align  1
+_vector_base:
+    .option norvc;
+    .word   _start
+    .word   0
+    .word   NMI_Handler                /* NMI */
+    .word   HardFault_Handler          /* Hard Fault */
+    .word   0
+    .word   Ecall_M_Mode_Handler       /* Ecall M Mode */
+    .word   0
+    .word   0
+    .word   Ecall_U_Mode_Handler       /* Ecall U Mode */
+    .word   Break_Point_Handler        /* Break Point */
+    .word   0
+    .word   0
+    .word   SysTick_Handler            /* SysTick */
+    .word   0
+    .word   SW_Handler                 /* SW */
+    .word   0
+    /* External Interrupts */
+    .word   WWDG_IRQHandler            /* Window Watchdog */
+    .word   PVD_IRQHandler             /* PVD through EXTI Line detect */
+    .word   TAMPER_IRQHandler          /* TAMPER */
+    .word   RTC_IRQHandler             /* RTC */
+    .word   FLASH_IRQHandler           /* Flash */
+    .word   RCC_IRQHandler             /* RCC */
+    .word   EXTI0_IRQHandler           /* EXTI Line 0 */
+    .word   EXTI1_IRQHandler           /* EXTI Line 1 */
+    .word   EXTI2_IRQHandler           /* EXTI Line 2 */
+    .word   EXTI3_IRQHandler           /* EXTI Line 3 */
+    .word   EXTI4_IRQHandler           /* EXTI Line 4 */
+    .word   DMA1_Channel1_IRQHandler   /* DMA1 Channel 1 */
+    .word   DMA1_Channel2_IRQHandler   /* DMA1 Channel 2 */
+    .word   DMA1_Channel3_IRQHandler   /* DMA1 Channel 3 */
+    .word   DMA1_Channel4_IRQHandler   /* DMA1 Channel 4 */
+    .word   DMA1_Channel5_IRQHandler   /* DMA1 Channel 5 */
+    .word   DMA1_Channel6_IRQHandler   /* DMA1 Channel 6 */
+    .word   DMA1_Channel7_IRQHandler   /* DMA1 Channel 7 */
+    .word   ADC1_2_IRQHandler          /* ADC1_2 */
+    .word   USB_HP_CAN1_TX_IRQHandler  /* USB HP and CAN1 TX */
+    .word   USB_LP_CAN1_RX0_IRQHandler /* USB LP and CAN1RX0 */
+    .word   CAN1_RX1_IRQHandler        /* CAN1 RX1 */
+    .word   CAN1_SCE_IRQHandler        /* CAN1 SCE */
+    .word   EXTI9_5_IRQHandler         /* EXTI Line 9..5 */
+    .word   TIM1_BRK_IRQHandler        /* TIM1 Break */
+    .word   TIM1_UP_IRQHandler         /* TIM1 Update */
+    .word   TIM1_TRG_COM_IRQHandler    /* TIM1 Trigger and Commutation */
+    .word   TIM1_CC_IRQHandler         /* TIM1 Capture Compare */
+    .word   TIM2_IRQHandler            /* TIM2 */
+    .word   TIM3_IRQHandler            /* TIM3 */
+    .word   TIM4_IRQHandler            /* TIM4 */
+    .word   I2C1_EV_IRQHandler         /* I2C1 Event */
+    .word   I2C1_ER_IRQHandler         /* I2C1 Error */
+    .word   I2C2_EV_IRQHandler         /* I2C2 Event */
+    .word   I2C2_ER_IRQHandler         /* I2C2 Error */
+    .word   SPI1_IRQHandler            /* SPI1 */
+    .word   SPI2_IRQHandler            /* SPI2 */
+    .word   USART1_IRQHandler          /* USART1 */
+    .word   USART2_IRQHandler          /* USART2 */
+    .word   USART3_IRQHandler          /* USART3 */
+    .word   EXTI15_10_IRQHandler       /* EXTI Line 15..10 */
+    .word   RTCAlarm_IRQHandler        /* RTC Alarm through EXTI Line */
+    .word   USBWakeUp_IRQHandler       /* USB Wake up from suspend */
+    .word   USBFS_IRQHandler           /* USBFS Break */
+    .word   USBFSWakeUp_IRQHandler     /* USBFS Wake up from suspend */
+    .word   ETH_IRQHandler             /* ETH global */
+    .word   ETHWakeUp_IRQHandler       /* ETH Wake up */
+    .word   0                          /* BLE BB */
+    .word   0                          /* BLE LLE */
+    .word   TIM5_IRQHandler            /* TIM5 */
+    .word   UART4_IRQHandler           /* UART4 */
+    .word   DMA1_Channel8_IRQHandler   /* DMA1 Channel8 */
+    .word   OSC32KCal_IRQHandler       /* OSC32KCal */
+    .word   OSCWakeUp_IRQHandler       /* OSC Wake Up */
+
+    .option rvc;
+    .section    .text.vector_handler, "ax", @progbits
+    .weak   NMI_Handler                /* NMI */
+    .weak   HardFault_Handler          /* Hard Fault */
+    .weak   Ecall_M_Mode_Handler       /* Ecall M Mode */
+    .weak   Ecall_U_Mode_Handler       /* Ecall U Mode */
+    .weak   Break_Point_Handler        /* Break Point */
+    .weak   SysTick_Handler            /* SysTick */
+    .weak   SW_Handler                 /* SW */
+    .weak   WWDG_IRQHandler            /* Window Watchdog */
+    .weak   PVD_IRQHandler             /* PVD through EXTI Line detect */
+    .weak   TAMPER_IRQHandler          /* TAMPER */
+    .weak   RTC_IRQHandler             /* RTC */
+    .weak   FLASH_IRQHandler           /* Flash */
+    .weak   RCC_IRQHandler             /* RCC */
+    .weak   EXTI0_IRQHandler           /* EXTI Line 0 */
+    .weak   EXTI1_IRQHandler           /* EXTI Line 1 */
+    .weak   EXTI2_IRQHandler           /* EXTI Line 2 */
+    .weak   EXTI3_IRQHandler           /* EXTI Line 3 */
+    .weak   EXTI4_IRQHandler           /* EXTI Line 4 */
+    .weak   DMA1_Channel1_IRQHandler   /* DMA1 Channel 1 */
+    .weak   DMA1_Channel2_IRQHandler   /* DMA1 Channel 2 */
+    .weak   DMA1_Channel3_IRQHandler   /* DMA1 Channel 3 */
+    .weak   DMA1_Channel4_IRQHandler   /* DMA1 Channel 4 */
+    .weak   DMA1_Channel5_IRQHandler   /* DMA1 Channel 5 */
+    .weak   DMA1_Channel6_IRQHandler   /* DMA1 Channel 6 */
+    .weak   DMA1_Channel7_IRQHandler   /* DMA1 Channel 7 */
+    .weak   ADC1_2_IRQHandler          /* ADC1_2 */
+    .weak   USB_HP_CAN1_TX_IRQHandler  /* USB HP and CAN1 TX */
+    .weak   USB_LP_CAN1_RX0_IRQHandler /* USB LP and CAN1RX0 */
+    .weak   CAN1_RX1_IRQHandler        /* CAN1 RX1 */
+    .weak   CAN1_SCE_IRQHandler        /* CAN1 SCE */
+    .weak   EXTI9_5_IRQHandler         /* EXTI Line 9..5 */
+    .weak   TIM1_BRK_IRQHandler        /* TIM1 Break */
+    .weak   TIM1_UP_IRQHandler         /* TIM1 Update */
+    .weak   TIM1_TRG_COM_IRQHandler    /* TIM1 Trigger and Commutation */
+    .weak   TIM1_CC_IRQHandler         /* TIM1 Capture Compare */
+    .weak   TIM2_IRQHandler            /* TIM2 */
+    .weak   TIM3_IRQHandler            /* TIM3 */
+    .weak   TIM4_IRQHandler            /* TIM4 */
+    .weak   I2C1_EV_IRQHandler         /* I2C1 Event */
+    .weak   I2C1_ER_IRQHandler         /* I2C1 Error */
+    .weak   I2C2_EV_IRQHandler         /* I2C2 Event */
+    .weak   I2C2_ER_IRQHandler         /* I2C2 Error */
+    .weak   SPI1_IRQHandler            /* SPI1 */
+    .weak   SPI2_IRQHandler            /* SPI2 */
+    .weak   USART1_IRQHandler          /* USART1 */
+    .weak   USART2_IRQHandler          /* USART2 */
+    .weak   USART3_IRQHandler          /* USART3 */
+    .weak   EXTI15_10_IRQHandler       /* EXTI Line 15..10 */
+    .weak   RTCAlarm_IRQHandler        /* RTC Alarm through EXTI Line */
+    .weak   USBWakeUp_IRQHandler       /* USB Wakeup from suspend */
+    .weak   USBFS_IRQHandler           /* USBFS */
+    .weak   USBFSWakeUp_IRQHandler     /* USBFS Wake Up */
+    .weak   ETH_IRQHandler             /* ETH global */
+    .weak   ETHWakeUp_IRQHandler       /* ETHWakeUp */
+    .weak   TIM5_IRQHandler            /* TIM5 */
+    .weak   UART4_IRQHandler           /* UART4 */
+    .weak   DMA1_Channel8_IRQHandler   /* DMA1 Channel8 */
+    .weak   OSC32KCal_IRQHandler       /* OSC32 KCal */
+    .weak   OSCWakeUp_IRQHandler       /* OSC Wake Up */
+
+NMI_Handler:
+HardFault_Handler:
+Ecall_M_Mode_Handler:
+Ecall_U_Mode_Handler:
+Break_Point_Handler:
+SysTick_Handler:
+SW_Handler:
+WWDG_IRQHandler:
+PVD_IRQHandler:
+TAMPER_IRQHandler:
+RTC_IRQHandler:
+FLASH_IRQHandler:
+RCC_IRQHandler:
+EXTI0_IRQHandler:
+EXTI1_IRQHandler:
+EXTI2_IRQHandler:
+EXTI3_IRQHandler:
+EXTI4_IRQHandler:
+DMA1_Channel1_IRQHandler:
+DMA1_Channel2_IRQHandler:
+DMA1_Channel3_IRQHandler:
+DMA1_Channel4_IRQHandler:
+DMA1_Channel5_IRQHandler:
+DMA1_Channel6_IRQHandler:
+DMA1_Channel7_IRQHandler:
+ADC1_2_IRQHandler:
+USB_HP_CAN1_TX_IRQHandler:
+USB_LP_CAN1_RX0_IRQHandler:
+CAN1_RX1_IRQHandler:
+CAN1_SCE_IRQHandler:
+EXTI9_5_IRQHandler:
+TIM1_BRK_IRQHandler:
+TIM1_UP_IRQHandler:
+TIM1_TRG_COM_IRQHandler:
+TIM1_CC_IRQHandler:
+TIM2_IRQHandler:
+TIM3_IRQHandler:
+TIM4_IRQHandler:
+I2C1_EV_IRQHandler:
+I2C1_ER_IRQHandler:
+I2C2_EV_IRQHandler:
+I2C2_ER_IRQHandler:
+SPI1_IRQHandler:
+SPI2_IRQHandler:
+USART1_IRQHandler:
+USART2_IRQHandler:
+USART3_IRQHandler:
+EXTI15_10_IRQHandler:
+RTCAlarm_IRQHandler:
+USBWakeUp_IRQHandler:
+USBFS_IRQHandler:
+USBFSWakeUp_IRQHandler:
+ETH_IRQHandler:
+ETHWakeUp_IRQHandler:
+TIM5_IRQHandler:
+OSC32KCal_IRQHandler:
+OSCWakeUp_IRQHandler:
+UART4_IRQHandler:
+DMA1_Channel8_IRQHandler:
+1:
+	j 1b
+
+	.section	.text.handle_reset,"ax",@progbits
+	.weak	handle_reset
+	.align	1
+handle_reset:
+.option push 
+.option	norelax 
+	la gp, __global_pointer$
+.option	pop 
+1:
+	la sp, _eusrstack 
+2:
+/* Load data section from flash to RAM */
+	la a0, _data_lma
+	la a1, _data_vma
+	la a2, _edata
+	bgeu a1, a2, 2f
+1:
+	lw t0, (a0)
+	sw t0, (a1)
+	addi a0, a0, 4
+	addi a1, a1, 4
+	bltu a1, a2, 1b
+2:
+/* Clear bss section */
+	la a0, _sbss
+	la a1, _ebss
+	bgeu a0, a1, 2f
+1:
+	sw zero, (a0)
+	addi a0, a0, 4
+	bltu a0, a1, 1b
+2:
+/* Configure pipelining and instruction prediction */
+    li t0, 0x1f
+    csrw 0xbc0, t0
+/* Enable interrupt nesting and hardware stack */
+	li t0, 0x3
+	csrw 0x804, t0
+/* Enable global interrupt and configure privileged mode */
+   	li t0, 0x88           
+   	csrw mstatus, t0
+/* Configure the interrupt vector table recognition mode and entry address mode */
+ 	la t0, _vector_base
+    ori t0, t0, 3           
+	csrw mtvec, t0
+
+    jal  SystemInit
+	la t0, main
+	csrw mepc, t0
+	mret

src/startup/startup_ch32v20x_D8W.S

@@ -0,0 +1,275 @@
+;/********************************** (C) COPYRIGHT *******************************
+;* File Name          : startup_ch32v20x_D8W.s
+;* Author             : WCH
+;* Version            : V1.0.1
+;* Date               : 2023/11/11
+;* Description        : CH32V208x
+;*                    vector table for eclipse toolchain.
+;*********************************************************************************
+;* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+;* Attention: This software (modified or not) and binary are used for 
+;* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+
+	.section	.init,"ax",@progbits
+	.global	_start
+	.align	1
+_start:
+	j	handle_reset
+
+    .section    .vector,"ax",@progbits
+    .align  1
+_vector_base:
+    .option norvc;
+    .word   _start
+    .word   0
+    .word   NMI_Handler                /* NMI */
+    .word   HardFault_Handler          /* Hard Fault */
+    .word   0
+    .word   Ecall_M_Mode_Handler       /* Ecall M Mode */
+    .word   0
+    .word   0
+    .word   Ecall_U_Mode_Handler       /* Ecall U Mode */
+    .word   Break_Point_Handler        /* Break Point */
+    .word   0
+    .word   0
+    .word   SysTick_Handler            /* SysTick */
+    .word   0
+    .word   SW_Handler                 /* SW */
+    .word   0
+    /* External Interrupts */
+    .word   WWDG_IRQHandler            /* Window Watchdog */
+    .word   PVD_IRQHandler             /* PVD through EXTI Line detect */
+    .word   TAMPER_IRQHandler          /* TAMPER */
+    .word   RTC_IRQHandler             /* RTC */
+    .word   FLASH_IRQHandler           /* Flash */
+    .word   RCC_IRQHandler             /* RCC */
+    .word   EXTI0_IRQHandler           /* EXTI Line 0 */
+    .word   EXTI1_IRQHandler           /* EXTI Line 1 */
+    .word   EXTI2_IRQHandler           /* EXTI Line 2 */
+    .word   EXTI3_IRQHandler           /* EXTI Line 3 */
+    .word   EXTI4_IRQHandler           /* EXTI Line 4 */
+    .word   DMA1_Channel1_IRQHandler   /* DMA1 Channel 1 */
+    .word   DMA1_Channel2_IRQHandler   /* DMA1 Channel 2 */
+    .word   DMA1_Channel3_IRQHandler   /* DMA1 Channel 3 */
+    .word   DMA1_Channel4_IRQHandler   /* DMA1 Channel 4 */
+    .word   DMA1_Channel5_IRQHandler   /* DMA1 Channel 5 */
+    .word   DMA1_Channel6_IRQHandler   /* DMA1 Channel 6 */
+    .word   DMA1_Channel7_IRQHandler   /* DMA1 Channel 7 */
+    .word   ADC1_2_IRQHandler          /* ADC1_2 */
+    .word   USB_HP_CAN1_TX_IRQHandler  /* USB HP and CAN1 TX */
+    .word   USB_LP_CAN1_RX0_IRQHandler /* USB LP and CAN1RX0 */
+    .word   CAN1_RX1_IRQHandler        /* CAN1 RX1 */
+    .word   CAN1_SCE_IRQHandler        /* CAN1 SCE */
+    .word   EXTI9_5_IRQHandler         /* EXTI Line 9..5 */
+    .word   TIM1_BRK_IRQHandler        /* TIM1 Break */
+    .word   TIM1_UP_IRQHandler         /* TIM1 Update */
+    .word   TIM1_TRG_COM_IRQHandler    /* TIM1 Trigger and Commutation */
+    .word   TIM1_CC_IRQHandler         /* TIM1 Capture Compare */
+    .word   TIM2_IRQHandler            /* TIM2 */
+    .word   TIM3_IRQHandler            /* TIM3 */
+    .word   TIM4_IRQHandler            /* TIM4 */
+    .word   I2C1_EV_IRQHandler         /* I2C1 Event */
+    .word   I2C1_ER_IRQHandler         /* I2C1 Error */
+    .word   I2C2_EV_IRQHandler         /* I2C2 Event */
+    .word   I2C2_ER_IRQHandler         /* I2C2 Error */
+    .word   SPI1_IRQHandler            /* SPI1 */
+    .word   SPI2_IRQHandler            /* SPI2 */
+    .word   USART1_IRQHandler          /* USART1 */
+    .word   USART2_IRQHandler          /* USART2 */
+    .word   USART3_IRQHandler          /* USART3 */
+    .word   EXTI15_10_IRQHandler       /* EXTI Line 15..10 */
+    .word   RTCAlarm_IRQHandler        /* RTC Alarm through EXTI Line */
+    .word   USBWakeUp_IRQHandler       /* USB Wake up from suspend */
+    .word   USBFS_IRQHandler           /* USBFS Break */
+    .word   USBFSWakeUp_IRQHandler     /* USBFS Wake up from suspend */
+    .word   ETH_IRQHandler             /* ETH global */
+    .word   ETHWakeUp_IRQHandler       /* ETH Wake up */
+    .word   BB_IRQHandler              /* BLE BB */
+    .word   LLE_IRQHandler             /* BLE LLE */
+    .word   TIM5_IRQHandler            /* TIM5 */
+    .word   UART4_IRQHandler           /* UART4 */
+    .word   DMA1_Channel8_IRQHandler   /* DMA1 Channel8 */
+    .word   OSC32KCal_IRQHandler       /* OSC32KCal */
+    .word   OSCWakeUp_IRQHandler       /* OSC Wake Up */
+
+    .option rvc;
+    .section    .text.vector_handler, "ax", @progbits
+    .weak   NMI_Handler                /* NMI */
+    .weak   HardFault_Handler          /* Hard Fault */
+    .weak   Ecall_M_Mode_Handler       /* Ecall M Mode */
+    .weak   Ecall_U_Mode_Handler       /* Ecall U Mode */
+    .weak   Break_Point_Handler        /* Break Point */
+    .weak   SysTick_Handler            /* SysTick */
+    .weak   SW_Handler                 /* SW */
+    .weak   WWDG_IRQHandler            /* Window Watchdog */
+    .weak   PVD_IRQHandler             /* PVD through EXTI Line detect */
+    .weak   TAMPER_IRQHandler          /* TAMPER */
+    .weak   RTC_IRQHandler             /* RTC */
+    .weak   FLASH_IRQHandler           /* Flash */
+    .weak   RCC_IRQHandler             /* RCC */
+    .weak   EXTI0_IRQHandler           /* EXTI Line 0 */
+    .weak   EXTI1_IRQHandler           /* EXTI Line 1 */
+    .weak   EXTI2_IRQHandler           /* EXTI Line 2 */
+    .weak   EXTI3_IRQHandler           /* EXTI Line 3 */
+    .weak   EXTI4_IRQHandler           /* EXTI Line 4 */
+    .weak   DMA1_Channel1_IRQHandler   /* DMA1 Channel 1 */
+    .weak   DMA1_Channel2_IRQHandler   /* DMA1 Channel 2 */
+    .weak   DMA1_Channel3_IRQHandler   /* DMA1 Channel 3 */
+    .weak   DMA1_Channel4_IRQHandler   /* DMA1 Channel 4 */
+    .weak   DMA1_Channel5_IRQHandler   /* DMA1 Channel 5 */
+    .weak   DMA1_Channel6_IRQHandler   /* DMA1 Channel 6 */
+    .weak   DMA1_Channel7_IRQHandler   /* DMA1 Channel 7 */
+    .weak   ADC1_2_IRQHandler          /* ADC1_2 */
+    .weak   USB_HP_CAN1_TX_IRQHandler  /* USB HP and CAN1 TX */
+    .weak   USB_LP_CAN1_RX0_IRQHandler /* USB LP and CAN1RX0 */
+    .weak   CAN1_RX1_IRQHandler        /* CAN1 RX1 */
+    .weak   CAN1_SCE_IRQHandler        /* CAN1 SCE */
+    .weak   EXTI9_5_IRQHandler         /* EXTI Line 9..5 */
+    .weak   TIM1_BRK_IRQHandler        /* TIM1 Break */
+    .weak   TIM1_UP_IRQHandler         /* TIM1 Update */
+    .weak   TIM1_TRG_COM_IRQHandler    /* TIM1 Trigger and Commutation */
+    .weak   TIM1_CC_IRQHandler         /* TIM1 Capture Compare */
+    .weak   TIM2_IRQHandler            /* TIM2 */
+    .weak   TIM3_IRQHandler            /* TIM3 */
+    .weak   TIM4_IRQHandler            /* TIM4 */
+    .weak   I2C1_EV_IRQHandler         /* I2C1 Event */
+    .weak   I2C1_ER_IRQHandler         /* I2C1 Error */
+    .weak   I2C2_EV_IRQHandler         /* I2C2 Event */
+    .weak   I2C2_ER_IRQHandler         /* I2C2 Error */
+    .weak   SPI1_IRQHandler            /* SPI1 */
+    .weak   SPI2_IRQHandler            /* SPI2 */
+    .weak   USART1_IRQHandler          /* USART1 */
+    .weak   USART2_IRQHandler          /* USART2 */
+    .weak   USART3_IRQHandler          /* USART3 */
+    .weak   EXTI15_10_IRQHandler       /* EXTI Line 15..10 */
+    .weak   RTCAlarm_IRQHandler        /* RTC Alarm through EXTI Line */
+    .weak   USBWakeUp_IRQHandler       /* USB Wakeup from suspend */
+    .weak   USBFS_IRQHandler           /* USBFS */
+    .weak   USBFSWakeUp_IRQHandler     /* USBFS Wake Up */
+    .weak   ETH_IRQHandler             /* ETH global */
+    .weak   ETHWakeUp_IRQHandler       /* ETHWakeUp */
+    .weak   BB_IRQHandler              /* BLE BB */
+    .weak   LLE_IRQHandler             /* BLE LLE */
+    .weak   TIM5_IRQHandler            /* TIM5 */
+    .weak   UART4_IRQHandler           /* UART4 */
+    .weak   DMA1_Channel8_IRQHandler   /* DMA1 Channel8 */
+    .weak   OSC32KCal_IRQHandler       /* OSC32 KCal */
+    .weak   OSCWakeUp_IRQHandler       /* OSC Wake Up */
+
+NMI_Handler:
+HardFault_Handler:
+Ecall_M_Mode_Handler:
+Ecall_U_Mode_Handler:
+Break_Point_Handler:
+SysTick_Handler:
+SW_Handler:
+WWDG_IRQHandler:
+PVD_IRQHandler:
+TAMPER_IRQHandler:
+RTC_IRQHandler:
+FLASH_IRQHandler:
+RCC_IRQHandler:
+EXTI0_IRQHandler:
+EXTI1_IRQHandler:
+EXTI2_IRQHandler:
+EXTI3_IRQHandler:
+EXTI4_IRQHandler:
+DMA1_Channel1_IRQHandler:
+DMA1_Channel2_IRQHandler:
+DMA1_Channel3_IRQHandler:
+DMA1_Channel4_IRQHandler:
+DMA1_Channel5_IRQHandler:
+DMA1_Channel6_IRQHandler:
+DMA1_Channel7_IRQHandler:
+ADC1_2_IRQHandler:
+USB_HP_CAN1_TX_IRQHandler:
+USB_LP_CAN1_RX0_IRQHandler:
+CAN1_RX1_IRQHandler:
+CAN1_SCE_IRQHandler:
+EXTI9_5_IRQHandler:
+TIM1_BRK_IRQHandler:
+TIM1_UP_IRQHandler:
+TIM1_TRG_COM_IRQHandler:
+TIM1_CC_IRQHandler:
+TIM2_IRQHandler:
+TIM3_IRQHandler:
+TIM4_IRQHandler:
+I2C1_EV_IRQHandler:
+I2C1_ER_IRQHandler:
+I2C2_EV_IRQHandler:
+I2C2_ER_IRQHandler:
+SPI1_IRQHandler:
+SPI2_IRQHandler:
+USART1_IRQHandler:
+USART2_IRQHandler:
+USART3_IRQHandler:
+EXTI15_10_IRQHandler:
+RTCAlarm_IRQHandler:
+USBWakeUp_IRQHandler:
+USBFS_IRQHandler:
+USBFSWakeUp_IRQHandler:
+ETH_IRQHandler:
+ETHWakeUp_IRQHandler:
+BB_IRQHandler:
+LLE_IRQHandler:
+TIM5_IRQHandler:
+UART4_IRQHandler:
+DMA1_Channel8_IRQHandler:
+OSC32KCal_IRQHandler:
+OSCWakeUp_IRQHandler:
+1:
+	j 1b
+
+	.section	.text.handle_reset,"ax",@progbits
+	.weak	handle_reset
+	.align	1
+handle_reset:
+.option push 
+.option	norelax 
+	la gp, __global_pointer$
+.option	pop 
+1:
+	la sp, _eusrstack 
+2:
+/* Load data section from flash to RAM */
+	la a0, _data_lma
+	la a1, _data_vma
+	la a2, _edata
+	bgeu a1, a2, 2f
+1:
+	lw t0, (a0)
+	sw t0, (a1)
+	addi a0, a0, 4
+	addi a1, a1, 4
+	bltu a1, a2, 1b
+2:
+/* Clear bss section */
+	la a0, _sbss
+	la a1, _ebss
+	bgeu a0, a1, 2f
+1:
+	sw zero, (a0)
+	addi a0, a0, 4
+	bltu a0, a1, 1b
+2:
+/* Configure pipelining and instruction prediction */
+    li t0, 0x1f
+    csrw 0xbc0, t0
+/* Enable interrupt nesting and hardware stack */
+	li t0, 0x3
+	csrw 0x804, t0
+/* Enable global interrupt and configure privileged mode */
+   	li t0, 0x88           
+   	csrw mstatus, t0
+/* Configure the interrupt vector table recognition mode and entry address mode */
+ 	la t0, _vector_base
+    ori t0, t0, 3           
+	csrw mtvec, t0
+
+    jal  SystemInit
+	la t0, main
+	csrw mepc, t0
+	mret
+
+

src/system/CMakeLists.txt

@@ -0,0 +1,6 @@
+# LOCATION: projectroot/src/system
+
+add_library(system_ch32v20x SHARED
+    system_ch32v20x.c
+)
+target_include_directories(system_ch32v20x PUBLIC ./inc)

src/system/system_ch32v20x.c

@@ -0,0 +1,987 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : system_ch32v20x.c
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : CH32V20x Device Peripheral Access Layer System Source File.
+ *                      For HSE = 32Mhz (CH32V208x/CH32V203RBT6)
+ *                      For HSE = 8Mhz (other CH32V203x)
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#include "ch32v20x.h" 
+
+/* 
+* Uncomment the line corresponding to the desired System clock (SYSCLK) frequency (after 
+* reset the HSI is used as SYSCLK source).
+* If none of the define below is enabled, the HSI is used as System clock source. 
+*/
+//#define SYSCLK_FREQ_HSE    HSE_VALUE
+//#define SYSCLK_FREQ_48MHz_HSE  48000000
+//#define SYSCLK_FREQ_56MHz_HSE  56000000
+//#define SYSCLK_FREQ_72MHz_HSE  72000000
+#define SYSCLK_FREQ_96MHz_HSE  96000000
+//#define SYSCLK_FREQ_120MHz_HSE  120000000
+//#define SYSCLK_FREQ_144MHz_HSE  144000000
+//#define SYSCLK_FREQ_HSI    HSI_VALUE
+//#define SYSCLK_FREQ_48MHz_HSI  48000000
+//#define SYSCLK_FREQ_56MHz_HSI  56000000
+//#define SYSCLK_FREQ_72MHz_HSI  72000000
+//#define SYSCLK_FREQ_96MHz_HSI  96000000
+//#define SYSCLK_FREQ_120MHz_HSI  120000000
+//#define SYSCLK_FREQ_144MHz_HSI  144000000
+
+/* Clock Definitions */
+#ifdef SYSCLK_FREQ_HSE
+uint32_t SystemCoreClock         = SYSCLK_FREQ_HSE;              /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_48MHz_HSE
+uint32_t SystemCoreClock         = SYSCLK_FREQ_48MHz_HSE;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_56MHz_HSE
+uint32_t SystemCoreClock         = SYSCLK_FREQ_56MHz_HSE;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_72MHz_HSE
+uint32_t SystemCoreClock         = SYSCLK_FREQ_72MHz_HSE;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_96MHz_HSE
+uint32_t SystemCoreClock         = SYSCLK_FREQ_96MHz_HSE;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_120MHz_HSE
+uint32_t SystemCoreClock         = SYSCLK_FREQ_120MHz_HSE;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_144MHz_HSE
+uint32_t SystemCoreClock         = SYSCLK_FREQ_144MHz_HSE;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_48MHz_HSI
+uint32_t SystemCoreClock         = SYSCLK_FREQ_48MHz_HSI;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_56MHz_HSI
+uint32_t SystemCoreClock         = SYSCLK_FREQ_56MHz_HSI;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_72MHz_HSI
+uint32_t SystemCoreClock         = SYSCLK_FREQ_72MHz_HSI;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_96MHz_HSI
+uint32_t SystemCoreClock         = SYSCLK_FREQ_96MHz_HSI;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_120MHz_HSI
+uint32_t SystemCoreClock         = SYSCLK_FREQ_120MHz_HSI;        /* System Clock Frequency (Core Clock) */
+#elif defined SYSCLK_FREQ_144MHz_HSI
+uint32_t SystemCoreClock         = SYSCLK_FREQ_144MHz_HSI;        /* System Clock Frequency (Core Clock) */
+#else
+uint32_t SystemCoreClock         = HSI_VALUE;                    /* System Clock Frequency (Core Clock) */
+
+#endif
+
+__I uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
+
+
+/* system_private_function_proto_types */
+static void SetSysClock(void);
+
+#ifdef SYSCLK_FREQ_HSE
+static void SetSysClockToHSE( void );
+#elif defined SYSCLK_FREQ_48MHz_HSE
+static void SetSysClockTo48_HSE( void );
+#elif defined SYSCLK_FREQ_56MHz_HSE
+static void SetSysClockTo56_HSE( void );
+#elif defined SYSCLK_FREQ_72MHz_HSE
+static void SetSysClockTo72_HSE( void );
+#elif defined SYSCLK_FREQ_96MHz_HSE
+static void SetSysClockTo96_HSE( void );
+#elif defined SYSCLK_FREQ_120MHz_HSE
+static void SetSysClockTo120_HSE( void );
+#elif defined SYSCLK_FREQ_144MHz_HSE
+static void SetSysClockTo144_HSE( void );
+#elif defined SYSCLK_FREQ_48MHz_HSI
+static void SetSysClockTo48_HSI( void );
+#elif defined SYSCLK_FREQ_56MHz_HSI
+static void SetSysClockTo56_HSI( void );
+#elif defined SYSCLK_FREQ_72MHz_HSI
+static void SetSysClockTo72_HSI( void );
+#elif defined SYSCLK_FREQ_96MHz_HSI
+static void SetSysClockTo96_HSI( void );
+#elif defined SYSCLK_FREQ_120MHz_HSI
+static void SetSysClockTo120_HSI( void );
+#elif defined SYSCLK_FREQ_144MHz_HSI
+static void SetSysClockTo144_HSI( void );
+
+#endif
+
+/*********************************************************************
+ * @fn      SystemInit
+ *
+ * @brief   Setup the microcontroller system Initialize the Embedded Flash Interface,
+ *        the PLL and update the SystemCoreClock variable.
+ *
+ * @return  none
+ */
+void SystemInit (void)
+{
+  RCC->CTLR |= (uint32_t)0x00000001;
+  RCC->CFGR0 &= (uint32_t)0xF0FF0000;
+  RCC->CTLR &= (uint32_t)0xFEF6FFFF;
+  RCC->CTLR &= (uint32_t)0xFFFBFFFF;
+  RCC->CFGR0 &= (uint32_t)0xFF00FFFF;
+  RCC->INTR = 0x009F0000;    
+  SetSysClock();
+}
+
+
+/*********************************************************************
+ * @fn      SystemCoreClockUpdate
+ *
+ * @brief   Update SystemCoreClock variable according to Clock Register Values.
+ *
+ * @return  none
+ */
+void SystemCoreClockUpdate (void)
+{
+  uint32_t tmp = 0, pllmull = 0, pllsource = 0, Pll_6_5 = 0;
+
+  tmp = RCC->CFGR0 & RCC_SWS;
+
+  switch (tmp)
+  {
+    case 0x00:
+      SystemCoreClock = HSI_VALUE;
+      break;
+    case 0x04:
+      SystemCoreClock = HSE_VALUE;
+      break;
+    case 0x08:
+      pllmull = RCC->CFGR0 & RCC_PLLMULL;
+      pllsource = RCC->CFGR0 & RCC_PLLSRC;
+      pllmull = ( pllmull >> 18) + 2;
+
+      if(pllmull == 17) pllmull = 18;
+
+      if (pllsource == 0x00)
+      {
+          if(EXTEN->EXTEN_CTR & EXTEN_PLL_HSI_PRE){
+              SystemCoreClock = HSI_VALUE * pllmull;
+          }
+          else{
+              SystemCoreClock = (HSI_VALUE >> 1) * pllmull;
+          }
+      }
+      else
+      {
+#if defined (CH32V20x_D8W) || defined (CH32V20x_D8)
+        if(((RCC->CFGR0 & (3<<22)) == (3<<22)) && (RCC_USB5PRE_JUDGE()== SET))
+        {
+          SystemCoreClock = ((HSE_VALUE>>1)) * pllmull;
+        }
+        else
+#endif
+        if ((RCC->CFGR0 & RCC_PLLXTPRE) != (uint32_t)RESET)
+        {
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+          SystemCoreClock = ((HSE_VALUE>>2) >> 1) * pllmull;
+#else
+          SystemCoreClock = (HSE_VALUE >> 1) * pllmull;
+#endif
+        }
+        else
+        {
+#if defined (CH32V20x_D8) || defined (CH32V20x_D8W)
+            SystemCoreClock = (HSE_VALUE>>2) * pllmull;
+#else
+          SystemCoreClock = HSE_VALUE * pllmull;
+#endif
+        }
+      }
+
+      if(Pll_6_5 == 1) SystemCoreClock = (SystemCoreClock / 2);
+
+      break;
+    default:
+      SystemCoreClock = HSI_VALUE;
+      break;
+  }
+
+  tmp = AHBPrescTable[((RCC->CFGR0 & RCC_HPRE) >> 4)];
+  SystemCoreClock >>= tmp;
+}
+
+/*********************************************************************
+ * @fn      SetSysClock
+ *
+ * @brief   Configures the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClock(void)
+{
+  //GPIO_IPD_Unused();
+#ifdef SYSCLK_FREQ_HSE
+    SetSysClockToHSE();
+#elif defined SYSCLK_FREQ_48MHz_HSE
+    SetSysClockTo48_HSE();
+#elif defined SYSCLK_FREQ_56MHz_HSE
+    SetSysClockTo56_HSE();
+#elif defined SYSCLK_FREQ_72MHz_HSE
+    SetSysClockTo72_HSE();
+#elif defined SYSCLK_FREQ_96MHz_HSE
+    SetSysClockTo96_HSE();
+#elif defined SYSCLK_FREQ_120MHz_HSE
+    SetSysClockTo120_HSE();
+#elif defined SYSCLK_FREQ_144MHz_HSE
+    SetSysClockTo144_HSE();
+#elif defined SYSCLK_FREQ_48MHz_HSI
+    SetSysClockTo48_HSI();
+#elif defined SYSCLK_FREQ_56MHz_HSI
+    SetSysClockTo56_HSI();
+#elif defined SYSCLK_FREQ_72MHz_HSI
+    SetSysClockTo72_HSI();
+#elif defined SYSCLK_FREQ_96MHz_HSI
+    SetSysClockTo96_HSI();
+#elif defined SYSCLK_FREQ_120MHz_HSI
+    SetSysClockTo120_HSI();
+#elif defined SYSCLK_FREQ_144MHz_HSI
+    SetSysClockTo144_HSI();
+
+#endif
+ 
+ /* If none of the define above is enabled, the HSI is used as System clock
+  * source (default after reset) 
+	*/ 
+}
+
+
+#ifdef SYSCLK_FREQ_HSE
+
+/*********************************************************************
+ * @fn      SetSysClockToHSE
+ *
+ * @brief   Sets HSE as System clock source and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockToHSE(void)
+{
+  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
+  
+   
+  RCC->CTLR |= ((uint32_t)RCC_HSEON);
+ 
+  /* Wait till HSE is ready and if Time out is reached exit */
+  do
+  {
+    HSEStatus = RCC->CTLR & RCC_HSERDY;
+    StartUpCounter++;  
+  } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
+
+  if ((RCC->CTLR & RCC_HSERDY) != RESET)
+  {
+    HSEStatus = (uint32_t)0x01;
+  }
+  else
+  {
+    HSEStatus = (uint32_t)0x00;
+  }  
+
+  if (HSEStatus == (uint32_t)0x01)
+  {
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;      
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV1;
+    
+    /* Select HSE as system clock source
+     *  CH32V20x_D6 (HSE=8MHZ)
+     *  CH32V20x_D8 (HSE=32MHZ)
+     *  CH32V20x_D8W (HSE=32MHZ)
+     */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_HSE;    
+
+    /* Wait till HSE is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x04)
+    {
+    }
+  }
+  else
+  { 
+		/* If HSE fails to start-up, the application will have wrong clock 
+     * configuration. User can add here some code to deal with this error 
+		 */
+  }  
+}
+
+#elif defined SYSCLK_FREQ_48MHz_HSE
+
+/*********************************************************************
+ * @fn      SetSysClockTo48_HSE
+ *
+ * @brief   Sets System clock frequency to 48MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo48_HSE(void)
+{
+  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
+     
+   
+  RCC->CTLR |= ((uint32_t)RCC_HSEON);
+  /* Wait till HSE is ready and if Time out is reached exit */
+  do
+  {
+    HSEStatus = RCC->CTLR & RCC_HSERDY;
+    StartUpCounter++;  
+  } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
+
+  if ((RCC->CTLR & RCC_HSERDY) != RESET)
+  {
+    HSEStatus = (uint32_t)0x01;
+  }
+  else
+  {
+    HSEStatus = (uint32_t)0x00;
+  }  
+
+  if (HSEStatus == (uint32_t)0x01)
+  {
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;    
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;  
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  CH32V20x_D6-PLL configuration: PLLCLK = HSE * 6 = 48 MHz (HSE=8MHZ)
+     *  CH32V20x_D8-PLL configuration: PLLCLK = HSE/4 * 6 = 48 MHz (HSE=32MHZ)
+     *  CH32V20x_D8W-PLL configuration: PLLCLK = HSE/4 * 6 = 48 MHz (HSE=32MHZ)
+     */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE | RCC_PLLMULL));
+
+     RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSE | RCC_PLLXTPRE_HSE | RCC_PLLMULL6);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;    
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+  }
+  else
+  { 
+		/* 
+		 * If HSE fails to start-up, the application will have wrong clock 
+     * configuration. User can add here some code to deal with this error 
+		 */
+  } 
+}
+
+#elif defined SYSCLK_FREQ_56MHz_HSE
+
+/*********************************************************************
+ * @fn      SetSysClockTo56_HSE
+ *
+ * @brief   Sets System clock frequency to 56MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo56_HSE(void)
+{
+  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
+     
+  RCC->CTLR |= ((uint32_t)RCC_HSEON);
+
+  /* Wait till HSE is ready and if Time out is reached exit */
+  do
+  {
+    HSEStatus = RCC->CTLR & RCC_HSERDY;
+    StartUpCounter++;  
+  } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
+
+  if ((RCC->CTLR & RCC_HSERDY) != RESET)
+  {
+    HSEStatus = (uint32_t)0x01;
+  }
+  else
+  {
+    HSEStatus = (uint32_t)0x00;
+  }  
+
+  if (HSEStatus == (uint32_t)0x01)
+  {
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;   
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+  
+    /*  CH32V20x_D6-PLL configuration: PLLCLK = HSE * 7 = 56 MHz (HSE=8MHZ)
+     *  CH32V20x_D8-PLL configuration: PLLCLK = HSE/4 * 7 = 56 MHz (HSE=32MHZ)
+     *  CH32V20x_D8W-PLL configuration: PLLCLK = HSE/4 * 7 = 56 MHz (HSE=32MHZ)
+     */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE | RCC_PLLMULL));
+
+    RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSE | RCC_PLLXTPRE_HSE | RCC_PLLMULL7);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;    
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+  }
+  else
+  { 
+		/* 
+		 * If HSE fails to start-up, the application will have wrong clock 
+     * configuration. User can add here some code to deal with this error 
+		 */
+  } 
+}
+
+#elif defined SYSCLK_FREQ_72MHz_HSE
+
+/*********************************************************************
+ * @fn      SetSysClockTo72_HSE
+ *
+ * @brief   Sets System clock frequency to 72MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo72_HSE(void)
+{
+  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
+     
+  RCC->CTLR |= ((uint32_t)RCC_HSEON);
+ 
+  /* Wait till HSE is ready and if Time out is reached exit */
+  do
+  {
+    HSEStatus = RCC->CTLR & RCC_HSERDY;
+    StartUpCounter++;  
+  } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
+
+  if ((RCC->CTLR & RCC_HSERDY) != RESET)
+  {
+    HSEStatus = (uint32_t)0x01;
+  }
+  else
+  {
+    HSEStatus = (uint32_t)0x00;
+  }  
+
+  if (HSEStatus == (uint32_t)0x01)
+  {
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1; 
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1; 
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+ 
+    /*  CH32V20x_D6-PLL configuration: PLLCLK = HSE * 9 = 72 MHz (HSE=8MHZ)
+     *  CH32V20x_D8-PLL configuration: PLLCLK = HSE/4 * 9 = 72 MHz (HSE=32MHZ)
+     *  CH32V20x_D8W-PLL configuration: PLLCLK = HSE/4 * 9 = 72 MHz (HSE=32MHZ)
+     */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE |
+                                        RCC_PLLMULL));
+
+    RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSE | RCC_PLLXTPRE_HSE | RCC_PLLMULL9);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }    
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;    
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+  }
+  else
+  { 
+		/* 
+		 * If HSE fails to start-up, the application will have wrong clock 
+     * configuration. User can add here some code to deal with this error 
+		 */
+  }
+}
+
+
+#elif defined SYSCLK_FREQ_96MHz_HSE
+
+/*********************************************************************
+ * @fn      SetSysClockTo96_HSE
+ *
+ * @brief   Sets System clock frequency to 96MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo96_HSE(void)
+{
+  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
+
+  RCC->CTLR |= ((uint32_t)RCC_HSEON);
+
+  /* Wait till HSE is ready and if Time out is reached exit */
+  do
+  {
+    HSEStatus = RCC->CTLR & RCC_HSERDY;
+    StartUpCounter++;
+  } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
+
+  if ((RCC->CTLR & RCC_HSERDY) != RESET)
+  {
+    HSEStatus = (uint32_t)0x01;
+  }
+  else
+  {
+    HSEStatus = (uint32_t)0x00;
+  }
+
+  if (HSEStatus == (uint32_t)0x01)
+  {
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  CH32V20x_D6-PLL configuration: PLLCLK = HSE * 12 = 96 MHz (HSE=8MHZ)
+     *  CH32V20x_D8-PLL configuration: PLLCLK = HSE/4 * 12 = 96 MHz (HSE=32MHZ)
+     *  CH32V20x_D8W-PLL configuration: PLLCLK = HSE/4 * 12 = 96 MHz (HSE=32MHZ)
+     */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE |
+                                        RCC_PLLMULL));
+
+    RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSE | RCC_PLLXTPRE_HSE | RCC_PLLMULL12);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+  }
+  else
+  {
+        /*
+         * If HSE fails to start-up, the application will have wrong clock
+     * configuration. User can add here some code to deal with this error
+         */
+  }
+}
+
+
+#elif defined SYSCLK_FREQ_120MHz_HSE
+
+/*********************************************************************
+ * @fn      SetSysClockTo120_HSE
+ *
+ * @brief   Sets System clock frequency to 120MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo120_HSE(void)
+{
+    __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
+
+    RCC->CTLR |= ((uint32_t)RCC_HSEON);
+
+    /* Wait till HSE is ready and if Time out is reached exit */
+    do
+    {
+        HSEStatus = RCC->CTLR & RCC_HSERDY;
+        StartUpCounter++;
+    } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
+
+    if((RCC->CTLR & RCC_HSERDY) != RESET)
+    {
+        HSEStatus = (uint32_t)0x01;
+    }
+    else
+    {
+        HSEStatus = (uint32_t)0x00;
+    }
+
+    if(HSEStatus == (uint32_t)0x01)
+    {
+#if defined (CH32V20x_D8W)
+        RCC->CFGR0 |= (uint32_t)(3<<22);
+        /* HCLK = SYSCLK/2 */
+        RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV2;
+#else
+        /* HCLK = SYSCLK */
+        RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+#endif
+        /* PCLK2 = HCLK */
+        RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+        /* PCLK1 = HCLK */
+        RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+        /*  CH32V20x_D6-PLL configuration: PLLCLK = HSE * 15 = 120 MHz (HSE=8MHZ)
+         *  CH32V20x_D8-PLL configuration: PLLCLK = HSE/4 * 15 = 120 MHz (HSE=32MHZ)
+         *  CH32V20x_D8W-PLL configuration: PLLCLK = HSE/2 * 15 = 240 MHz (HSE=32MHZ)
+         */
+        RCC->CFGR0 &= (uint32_t)((uint32_t) ~(RCC_PLLSRC | RCC_PLLXTPRE |
+                                              RCC_PLLMULL));
+
+        RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSE | RCC_PLLXTPRE_HSE | RCC_PLLMULL15);
+
+        /* Enable PLL */
+        RCC->CTLR |= RCC_PLLON;
+        /* Wait till PLL is ready */
+        while((RCC->CTLR & RCC_PLLRDY) == 0)
+        {
+        }
+        /* Select PLL as system clock source */
+        RCC->CFGR0 &= (uint32_t)((uint32_t) ~(RCC_SW));
+        RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+        /* Wait till PLL is used as system clock source */
+        while((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+        {
+        }
+    }
+    else
+    {
+        /*
+         * If HSE fails to start-up, the application will have wrong clock
+         * configuration. User can add here some code to deal with this error
+         */
+    }
+}
+#elif defined SYSCLK_FREQ_144MHz_HSE
+
+/*********************************************************************
+ * @fn      SetSysClockTo144_HSE
+ *
+ * @brief   Sets System clock frequency to 144MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo144_HSE(void)
+{
+  __IO uint32_t StartUpCounter = 0, HSEStatus = 0;
+
+  RCC->CTLR |= ((uint32_t)RCC_HSEON);
+
+  /* Wait till HSE is ready and if Time out is reached exit */
+  do
+  {
+    HSEStatus = RCC->CTLR & RCC_HSERDY;
+    StartUpCounter++;
+  } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT));
+
+  if ((RCC->CTLR & RCC_HSERDY) != RESET)
+  {
+    HSEStatus = (uint32_t)0x01;
+  }
+  else
+  {
+    HSEStatus = (uint32_t)0x00;
+  }
+
+  if (HSEStatus == (uint32_t)0x01)
+  {
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  CH32V20x_D6-PLL configuration: PLLCLK = HSE * 18 = 144 MHz (HSE=8MHZ)
+     *  CH32V20x_D8-PLL configuration: PLLCLK = HSE/4 * 18 = 144 MHz (HSE=32MHZ)
+     *  CH32V20x_D8W-PLL configuration: PLLCLK = HSE/4 * 18 = 144 MHz (HSE=32MHZ)
+     */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE |
+                                        RCC_PLLMULL));
+
+    RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSE | RCC_PLLXTPRE_HSE | RCC_PLLMULL18);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+  }
+  else
+  {
+        /*
+         * If HSE fails to start-up, the application will have wrong clock
+     * configuration. User can add here some code to deal with this error
+         */
+  }
+}
+
+#elif defined SYSCLK_FREQ_48MHz_HSI
+
+/*********************************************************************
+ * @fn      SetSysClockTo48_HSI
+ *
+ * @brief   Sets System clock frequency to 48MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo48_HSI(void)
+{
+    EXTEN->EXTEN_CTR |= EXTEN_PLL_HSI_PRE;
+
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  PLL configuration: PLLCLK = HSI * 6 = 48 MHz */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE | RCC_PLLMULL));
+
+     RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSI_Div2 | RCC_PLLMULL6);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+}
+
+#elif defined SYSCLK_FREQ_56MHz_HSI
+
+/*********************************************************************
+ * @fn      SetSysClockTo56_HSI
+ *
+ * @brief   Sets System clock frequency to 56MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo56_HSI(void)
+{
+    EXTEN->EXTEN_CTR |= EXTEN_PLL_HSI_PRE;
+
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  PLL configuration: PLLCLK = HSI * 7 = 48 MHz */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE | RCC_PLLMULL));
+
+     RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSI_Div2 | RCC_PLLMULL7);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+}
+
+#elif defined SYSCLK_FREQ_72MHz_HSI
+
+/*********************************************************************
+ * @fn      SetSysClockTo72_HSI
+ *
+ * @brief   Sets System clock frequency to 72MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo72_HSI(void)
+{
+    EXTEN->EXTEN_CTR |= EXTEN_PLL_HSI_PRE;
+
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  PLL configuration: PLLCLK = HSI * 9 = 72 MHz */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE | RCC_PLLMULL));
+
+     RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSI_Div2 | RCC_PLLMULL9);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+}
+
+
+#elif defined SYSCLK_FREQ_96MHz_HSI
+
+/*********************************************************************
+ * @fn      SetSysClockTo96_HSI
+ *
+ * @brief   Sets System clock frequency to 96MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo96_HSI(void)
+{
+    EXTEN->EXTEN_CTR |= EXTEN_PLL_HSI_PRE;
+
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  PLL configuration: PLLCLK = HSI * 12 = 96 MHz */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE | RCC_PLLMULL));
+
+     RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSI_Div2 | RCC_PLLMULL12);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+}
+
+
+#elif defined SYSCLK_FREQ_120MHz_HSI
+
+/*********************************************************************
+ * @fn      SetSysClockTo120_HSI
+ *
+ * @brief   Sets System clock frequency to 120MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo120_HSI(void)
+{
+    EXTEN->EXTEN_CTR |= EXTEN_PLL_HSI_PRE;
+
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  PLL configuration: PLLCLK = HSI * 15 = 120 MHz */
+    RCC->CFGR0 &= (uint32_t)((uint32_t) ~(RCC_PLLSRC | RCC_PLLXTPRE |
+                                          RCC_PLLMULL));
+
+    RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSI_Div2 | RCC_PLLMULL15);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t) ~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+}
+#elif defined SYSCLK_FREQ_144MHz_HSI
+
+/*********************************************************************
+ * @fn      SetSysClockTo144_HSI
+ *
+ * @brief   Sets System clock frequency to 144MHz and configure HCLK, PCLK2 and PCLK1 prescalers.
+ *
+ * @return  none
+ */
+static void SetSysClockTo144_HSI(void)
+{
+    EXTEN->EXTEN_CTR |= EXTEN_PLL_HSI_PRE;
+
+    /* HCLK = SYSCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_HPRE_DIV1;
+    /* PCLK2 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE2_DIV1;
+    /* PCLK1 = HCLK */
+    RCC->CFGR0 |= (uint32_t)RCC_PPRE1_DIV2;
+
+    /*  PLL configuration: PLLCLK = HSI * 18 = 144 MHz */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_PLLSRC | RCC_PLLXTPRE | RCC_PLLMULL));
+
+     RCC->CFGR0 |= (uint32_t)(RCC_PLLSRC_HSI_Div2 | RCC_PLLMULL18);
+
+    /* Enable PLL */
+    RCC->CTLR |= RCC_PLLON;
+    /* Wait till PLL is ready */
+    while((RCC->CTLR & RCC_PLLRDY) == 0)
+    {
+    }
+    /* Select PLL as system clock source */
+    RCC->CFGR0 &= (uint32_t)((uint32_t)~(RCC_SW));
+    RCC->CFGR0 |= (uint32_t)RCC_SW_PLL;
+    /* Wait till PLL is used as system clock source */
+    while ((RCC->CFGR0 & (uint32_t)RCC_SWS) != (uint32_t)0x08)
+    {
+    }
+}
+
+
+#endif

src/system/system_ch32v20x.h

@@ -0,0 +1,32 @@
+/********************************** (C) COPYRIGHT *******************************
+ * File Name          : system_ch32v20x.h
+ * Author             : WCH
+ * Version            : V1.0.0
+ * Date               : 2021/06/06
+ * Description        : CH32V20x Device Peripheral Access Layer System Header File.
+*********************************************************************************
+* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
+* Attention: This software (modified or not) and binary are used for 
+* microcontroller manufactured by Nanjing Qinheng Microelectronics.
+*******************************************************************************/
+#ifndef __SYSTEM_ch32v20x_H 
+#define __SYSTEM_ch32v20x_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif 
+
+extern uint32_t SystemCoreClock;          /* System Clock Frequency (Core Clock) */
+
+/* System_Exported_Functions */  
+extern void SystemInit(void);
+extern void SystemCoreClockUpdate(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*__CH32V20x_SYSTEM_H */
+
+
+