# ###############################
# WCH(RISC-V) toolchain file for the ch32v003
# ###############################

# ----------------------------------------
# File: riscv64-toolchain.cmake
# Description: Cmake file for the WCH controllers. It has two differnt
# types of kinds things it can output. It can output or build release binaries
# or it output debug builds.
# ----------------------------------------




##################################################
# Configurable Section
##################################################
# Specify the cross-compiler
#set(CROSS_TOOLCHAIN riscv32-unknown-elf-)
#set(CROSS_TOOLCHAIN riscv64-unknown-elf-)
set(CMAKE_SYSTEM_NAME Generic)
set(CMAKE_SYSTEM_PROCESSOR riscv)
set(CMAKE_SYSTEM_PROCESSOR "CUSTOM")
set(DEBUG_BINARY 1)
set(CMAKE_SYSTEM_VERSION 1)



# This logic checks the operating system.
if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "FreeBSD")
    message("OS:: FreeBSD")
    set(NEWLIB /usr/local/riscv/riscv64-unknown-elf/include)
    set(CMAKE_C_COMPILER riscv64-unknown-elf-gcc)
    set(CMAKE_CXX_COMPILER riscv64-unknown-elf-g++)
    set(CMAKE_FIND_ROOT_PATH /usr/local/riscv/)
    #set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --sysroot=${NEWLIB}")
    #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --sysroot=${NEWLIB}")
    # Without these two lines it freaks out.
    set(CMAKE_C_STANDARD_COMPUTED_DEFAULT GNU)
    set(CMAKE_CXX_STANDARD_COMPUTED_DEFAULT GNU)

elseif(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Linux")
    message("OS:: LINUX")
else()
    message("OS:: UNKNOWN?")
    message("Please add your OS details to the toolchain file.")
endif()

# Find the Newlib

# Find the ch32v003fun

#


# ----------------------------------------
# MCU Setup
# ----------------------------------------


#this really shouldn't be needed as it's also defined in the
# `/inc/funconfig.h` file.

# Specify the exact Chip
#set(MCU CH32V003J4M6)
#set(MCU CH32V003A4M6)
#set(MCU CH32V003F4P6)
#set(MCU CH32V003F4U6)
set(MCU CH32V003)

#Define it for the preprocessor as well.
add_compile_definitions(${MCU})

#add_definitions(-D${MCU})


##################################################
# Advanced Section
##################################################



#-------------------
# General Flags
#-------------------

set(OBJECT_GEN_FLAGS "\
-g \
-Os \
-flto \
-ffunction-sections \
-fdata-sections \
-fmessage-length=0 \
-msmall-data-limit=8 ")

#-------------------
# CFLAGS for ARCH
#-------------------

set(C_FLAGS_ARCH "\
-march=rv32ec \
-mabi=ilp32e \
-I${NEWLIB} \
-nostdlib")

#-------------------
# CFLAGS
#-------------------

# I'm appending to the existing cflags from the cmake file in the root dir.
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} \
${C_FLAGS_ARCH} \
${OBJECT_GEN_FLAGS}")


#-------------------
# ASMFLAGS for cross
#-------------------


#-------------------
# LFLAGS for cross
#-------------------

#set(LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/${LINKER_SCRIPT})
set(LINKER_SCRIPT "./src/ch32v003.ld")

#set(LD_FLAGS "-lgcc")
set(LD_FLAGS " \
    -Wl,--print-memory-usage \
    -Wl,-Map=${PROJECT_NAME}.map \
    -lgcc \
    -T ${LINKER_SCRIPT} \
    -Wl,--gc-sections")



#-------------------
# Print out info 
#-------------------

message(STATUS "CMAKE_C_FLAGS: ${CMAKE_C_FLAGS}")
message(STATUS "CMAKE_INCLUDE_PATH: ${CMAKE_INCLUDE_PATH}")
message(STATUS "CMAKE_FIND_ROOT_PATH: ${CMAKE_FIND_ROOT_PATH}")



# Unset all cache
unset(SEMIHOSTING)
unset(CMAKE_TOOLCHAIN_FILE)
unset(CMAKE_BUILD_TYPE)