Makefile for simple ATmega C projects

Makefile

MCU = atmega328p
DUDEMCU = m328p
PROG = usbasp

OPT = s
CPPFLAGS = -DF_CPU=16000000 -O$(OPT)
CFLAGS = -mmcu=$(MCU)

TARGET = main

CC = avr-gcc
DUDE = avrdude
OBJCOPY = avr-objcopy

.PHONY: build
build: $(TARGET).hex

$(TARGET).hex: $(TARGET).elf
	$(OBJCOPY) -O ihex $< $@

$(TARGET).elf: $(TARGET).o
	$(CC) $(CFLAGS) $< -o $@

$(TARGET).o: $(TARGET).c
	$(CC) $(CFLAGS) $(CPPFLAGS) -c $< -o $@

.PHONY: upload
upload: $(TARGET).hex
	$(DUDE) -c $(PROG) -p $(DUDEMCU) -v -U flash:w:$(TARGET).hex:i

.PHONY: clean
clean:
	rm -f $(TARGET).o $(TARGET).elf $(TARGET).hex