84 lines
2.7 KiB
Makefile
84 lines
2.7 KiB
Makefile
# frequency of the CPU (in Hz)
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F_CPU = 16000000UL
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TARGET = main
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CC = avr-gcc
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INCLUDES ?= -I../../headers/ # ?= : dont define if already defined
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AVRGCC_MCU_TYPE = atmega328p
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AVRDUDE_MCU_TYPE = m328p
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BAUD_RATE = 115200
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PROGRAMMER_ID = arduino
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# original firmware dump
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DUMP_ORI = ../../ressources/dump_atmega328p_ori.hex
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# Find all C source files in the current directory
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SRC = $(wildcard *.c)
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# Generate object file names from source file names
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OBJ = $(SRC:.c=.o)
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# Compiler flags
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CFLAGS = -mmcu=$(AVRGCC_MCU_TYPE) -D F_CPU=$(F_CPU) $(INCLUDES) -Os
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# Detect OS
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OS := $(shell uname -s)
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# Set Serial Port based on OS
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ifeq ($(OS), Darwin) # macOS
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SERIAL_PORT := $(shell ls /dev/tty.usb* 2>/dev/null | head -n 1) # should be : /dev/tty.usbserial-310
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else ifeq ($(OS), Linux) # Ubuntu/Linux
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SERIAL_PORT = $(shell ls /dev/ttyUSB* 2>/dev/null | head -n 1) # should be : /dev/ttyUSB0
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endif
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##
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## RULES
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##
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all: hex flash
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hex: $(TARGET).hex
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# Compile each .c file to corresponding .o file
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%.o: %.c
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$(CC) $(CFLAGS) -c $< -o $@
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# Link all object files to create the binary
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# avr-gcc : compiler for AVR microcontrollers, https://gcc.gnu.org/wiki/avr-gcc#Using_avr-gcc, https://gcc.gnu.org/onlinedocs/gcc/AVR-Options.html
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# -mmcu : the target microcontrolle (ATmega328P)
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# -D : defines a preprocessor macro (#define F_CPU <value>)
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# -o : output filename
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$(TARGET).bin: $(OBJ)
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$(CC) -mmcu=$(AVRGCC_MCU_TYPE) $(OBJ) -o $(TARGET).bin
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# Convert binary to hex for flashing
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# avr-objcopy : man avr-jobcopy, https://linux.die.net/man/1/avr-objcopy
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# -O : specifies output format, Intel HEX
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# some formats (list not found in any doc) :
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# -O ihex : Used for flashing AVR chips
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# -O binary : Raw binary file
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# -O elf32-avr : Used for debugging
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$(TARGET).hex: $(TARGET).bin
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avr-objcopy -O ihex $(TARGET).bin $(TARGET).hex
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# Flash the hex file to the microcontroller
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# avr-dude : AVR Downloader/UploaDEr, upload firmware, https://avrdudes.github.io/avrdude, v6.3 https://download-mirror.savannah.gnu.org/releases/avrdude/avrdude-doc-6.3.pdf
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# -p : specifies the microcontroller -> m328p
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# -c : programmer-id
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# -b : baud rate for serial communication
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# -P : the serial port, found with `ls /dev/tty*` -> /dev/ttyUSB0
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# -U : Uploads (w = write) the HEX firmware file to the flash memory
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# (-v : verbose info dump)
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flash:
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avrdude -p $(AVRDUDE_MCU_TYPE) -c $(PROGRAMMER_ID) -b $(BAUD_RATE) -P $(SERIAL_PORT) -U flash:w:$(TARGET).hex
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restore:
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avrdude -p $(AVRDUDE_MCU_TYPE) -c $(PROGRAMMER_ID) -b $(BAUD_RATE) -P $(SERIAL_PORT) -U flash:w:$(DUMP_ORI)
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dump:
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avrdude -p $(AVRDUDE_MCU_TYPE) -c $(PROGRAMMER_ID) -b $(BAUD_RATE) -P $(SERIAL_PORT) -U flash:r:dump.hex
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clean:
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rm -f main.hex main.bin *.o
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.PHONY : all clean hex flash restore
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