PREFIX := avr-
CFLAGS_COMMON := -I/usr/avr/include/
CFLAGS_CPU := -DF_CPU=16000000UL -mmcu=atmega328p -Os
CFLAGS := $(CFLAGS_COMMON) $(CFLAGS_CPU)
LDFLAGS_COMMON := -I/usr/avr/include/
LDFLAGS_CPU := -mmcu=atmega328p
LDFLAGS := $(LDFLAGS_COMMON) $(LDFLAGS_CPU)
CC := $(PREFIX)gcc

build: main.hex

flash: main.hex
	sudo avrdude -FV -c arduino -p ATmega328p -P /dev/ttyUSB0 -b 57600 -U flash:w:$<

clean:
	$(RM) *.hex *.elf *.o

bear: compile_commands.json

compile_commands.json: clean
	bear -- make build

main.hex: main.elf
	$(PREFIX)objcopy -O ihex -R .eeprom $< $@

main.elf: main.o
	$(CC) -w $(LDFLAGS) -o $@ $<

%.o: %.c %.h
	$(CC) $(CFLAGS) -c -o $@ $<

.PHONY: build flash clean bear