diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..d9a9bec --- /dev/null +++ b/Makefile @@ -0,0 +1,210 @@ + +##########------------------------------------------------------########## +########## Project-specific Details ########## +########## Check these every time you start a new project ########## +##########------------------------------------------------------########## + +#MCU = atmega168p +#MCU = atmega2560 +#MCU = attiny85 +MCU = atmega328p +F_CPU = 1000000UL +BAUD = 9600UL +## Also try BAUD = 19200 or 38400 if you're feeling lucky. + +## A directory for common include files and the simple USART library. +## If you move either the current folder or the Library folder, you'll +## need to change this path to match. +#LIBDIR = ../../AVR-Programming-Library +#LIBDIR = /usr/lib/gcc/avr/5.4.0/ +LIBDIR = /lib/avr/ + +##########------------------------------------------------------########## +########## Programmer Defaults ########## +########## Set up once, then forget about it ########## +########## (Can override. See bottom of file.) ########## +##########------------------------------------------------------########## + +PROGRAMMER_TYPE = usbasp-clone +# extra arguments to avrdude: baud rate, chip type, -F flag, etc. +PROGRAMMER_ARGS = -b 9600 -B 4 -v + +##########------------------------------------------------------########## +########## Program Locations ########## +########## Won't need to change if they're in your PATH ########## +##########------------------------------------------------------########## + +CC = avr-gcc +OBJCOPY = avr-objcopy +OBJDUMP = avr-objdump +AVRSIZE = avr-size +AVRDUDE = avrdude + +##########------------------------------------------------------########## +########## Makefile Magic! ########## +########## Summary: ########## +########## We want a .hex file ########## +########## Compile source files into .elf ########## +########## Convert .elf file into .hex ########## +########## You shouldn't need to edit below. ########## +##########------------------------------------------------------########## + +## The name of your project (without the .c) +# TARGET = blinkLED +## Or name it automatically after the enclosing directory +TARGET = $(lastword $(subst /, ,$(CURDIR))) + +# Object files: will find all .c/.h files in current directory +# and in LIBDIR. If you have any other (sub-)directories with code, +# you can add them in to SOURCES below in the wildcard statement. +SOURCES=$(wildcard *.c $(LIBDIR)/*.c) +OBJECTS=$(SOURCES:.c=.o) +HEADERS=$(SOURCES:.c=.h) + +## Compilation options, type man avr-gcc if you're curious. +CPPFLAGS = -DF_CPU=$(F_CPU) -DBAUD=$(BAUD) -I. -I$(LIBDIR) +CFLAGS = -Os -g -std=gnu99 -Wall +## Use short (8-bit) data types +CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums +## Splits up object files per function +CFLAGS += -ffunction-sections -fdata-sections +LDFLAGS = -Wl,-Map,$(TARGET).map +## Optional, but often ends up with smaller code +LDFLAGS += -Wl,--gc-sections +## Relax shrinks code even more, but makes disassembly messy +## LDFLAGS += -Wl,--relax +## LDFLAGS += -Wl,-u,vfprintf -lprintf_flt -lm ## for floating-point printf +## LDFLAGS += -Wl,-u,vfprintf -lprintf_min ## for smaller printf +TARGET_ARCH = -mmcu=$(MCU) + +## Explicit pattern rules: +## To make .o files from .c files +%.o: %.c $(HEADERS) Makefile + $(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c -o $@ $<; + +$(TARGET).elf: $(OBJECTS) + $(CC) $(LDFLAGS) $(TARGET_ARCH) $^ $(LDLIBS) -o $@ + +%.hex: %.elf + $(OBJCOPY) -j .text -j .data -O ihex $< $@ + +%.eeprom: %.elf + $(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@ + +%.lst: %.elf + $(OBJDUMP) -S $< > $@ + +## These targets don't have files named after them +.PHONY: all disassemble disasm eeprom size clean squeaky_clean flash fuses + +all: $(TARGET).hex + +debug: + @echo + @echo "Source files:" $(SOURCES) + @echo "MCU, F_CPU, BAUD:" $(MCU), $(F_CPU), $(BAUD) + @echo + +# Optionally create listing file from .elf +# This creates approximate assembly-language equivalent of your code. +# Useful for debugging time-sensitive bits, +# or making sure the compiler does what you want. +disassemble: $(TARGET).lst + +disasm: disassemble + +# Optionally show how big the resulting program is +size: $(TARGET).elf + $(AVRSIZE) -C --mcu=$(MCU) $(TARGET).elf + +clean: + rm -f $(TARGET).elf $(TARGET).hex $(TARGET).obj \ + $(TARGET).o $(TARGET).d $(TARGET).eep $(TARGET).lst \ + $(TARGET).lss $(TARGET).sym $(TARGET).map $(TARGET)~ \ + $(TARGET).eeprom + +squeaky_clean: + rm -f *.elf *.hex *.obj *.o *.d *.eep *.lst *.lss *.sym *.map *~ *.eeprom + +##########------------------------------------------------------########## +########## Programmer-specific details ########## +########## Flashing code to AVR using avrdude ########## +##########------------------------------------------------------########## + +flash: $(TARGET).hex + $(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U flash:w:$< + +## An alias +program: flash + +flash_eeprom: $(TARGET).eeprom + $(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -U eeprom:w:$< + +avrdude_terminal: + $(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nt + +## If you've got multiple programmers that you use, +## you can define them here so that it's easy to switch. +## To invoke, use something like `make flash_arduinoISP` +flash_usbtiny: PROGRAMMER_TYPE = usbtiny +flash_usbtiny: PROGRAMMER_ARGS = # USBTiny works with no further arguments +flash_usbtiny: flash + +flash_usbasp: PROGRAMMER_TYPE = usbasp +flash_usbasp: PROGRAMMER_ARGS = # USBasp works with no further arguments +flash_usbasp: flash + +flash_arduinoISP: PROGRAMMER_TYPE = avrisp +flash_arduinoISP: PROGRAMMER_ARGS = -b 19200 -P /dev/ttyACM0 +## (for windows) flash_arduinoISP: PROGRAMMER_ARGS = -b 19200 -P com5 +flash_arduinoISP: flash + +flash_109: PROGRAMMER_TYPE = avr109 +flash_109: PROGRAMMER_ARGS = -b 9600 -P /dev/ttyUSB0 +flash_109: flash + +##########------------------------------------------------------########## +########## Fuse settings and suitable defaults ########## +##########------------------------------------------------------########## + +## Mega 48, 88, 168, 328 default values +LFUSE = 0x62 # +HFUSE = 0xdf #High fuses +EFUSE = 0x00 # + +## ATtiny85 Settings +#LFUSE = 0x62 +#HFUSE = 0xdf +#EFUSE = 0xff + + + + + +## Generic +FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m + +fuses: + $(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) \ + $(PROGRAMMER_ARGS) $(FUSE_STRING) +show_fuses: + $(AVRDUDE) -c $(PROGRAMMER_TYPE) -p $(MCU) $(PROGRAMMER_ARGS) -nv + +## Called with no extra definitions, sets to defaults +set_default_fuses: FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m +set_default_fuses: fuses + +## Set the fuse byte for full-speed mode +## Note: can also be set in firmware for modern chips +set_fast_fuse: LFUSE = 0xE2 +set_fast_fuse: FUSE_STRING = -U lfuse:w:$(LFUSE):m +set_fast_fuse: fuses + +## Set the EESAVE fuse byte to preserve EEPROM across flashes +set_eeprom_save_fuse: HFUSE = 0xD7 +set_eeprom_save_fuse: FUSE_STRING = -U hfuse:w:$(HFUSE):m +set_eeprom_save_fuse: fuses + +## Clear the EESAVE fuse byte +clear_eeprom_save_fuse: FUSE_STRING = -U hfuse:w:$(HFUSE):m +clear_eeprom_save_fuse: fuses diff --git a/avr_usart.c b/avr_usart.c new file mode 100644 index 0000000..bdae0f9 --- /dev/null +++ b/avr_usart.c @@ -0,0 +1,121 @@ +/* + * Author: Jake Goodwin + * Date: 2023 + * Description: Small library to communicate with the AT-09 bluetooth module. + */ + +#include +#include +#include +#include +#include "avr_at-09.h" + + +//############################# +//Globals +//############################# + +int main() { + unsigned char* tx_buffer[16]; + unsigned char* rx_buffer[16]; + + led_blink(); + led_blink(); + led_blink(); + _delay_ms(1000); + + init_usart0(); + + //enable interrupts + sei(); + + while(1) { + led_blink(); + } + + return 0; +} + + + +//############################# +//FUNCTIONS +//############################# + +/* + * Input: None + * Output: None + * Description: init usart0 hardware in async mode + */ +void init_usart0(void) { + DDRB |= (1<>8); + UBRR0L |= (uint8_t) BT_UBRR; + + //Enable recv and Transmit pins, overrides other uses. + //IN the usart control and status register 0B + UCSR0B = (1< AT-09 TX + * AVR D1 --> AT-09 RX + * AVR D2 --> AT-09 State + */ +#define FOSC 1000000 +#define BLE_BAUD 9600 +#define BT_UBRR FOSC/16/BLE_BAUD - 1 + +#define TX_PIN PIND0 +#define TX_DDR DDD0 + +#define RX_PIN PIND1 +#define RX_DDR DDD1 + +#define AT_PORT PORTD + +//LED PIN for indicator and debug. +#define LED_PIN PINC0 +#define LED_DDR DDC0 + + +//############################# +//TYPES +//############################# + +//############################# +//FUNCTION PROTOTYPES +//############################# +static void led_blink(void); + +void init_usart0(void); +void tx_usart0(unsigned char data); +unsigned char rx_usart0(void); +