Makefile

# ATmega328P AVR Gameboy Handheld Console
# Build automation: `make` compiles, `make flash` programs via USBasp.

MCU        = atmega328p
F_CPU      = 20000000UL
PROGRAMMER = usbasp

CC      = avr-gcc
OBJCOPY = avr-objcopy
AVRDUDE = avrdude
SIZE    = avr-size

CFLAGS  = -Wall -Wextra -Os -std=gnu11 -mmcu=$(MCU) -DF_CPU=$(F_CPU)
CFLAGS += -ffunction-sections -fdata-sections
LDFLAGS = -mmcu=$(MCU) -Wl,--gc-sections

SRCS   = main.c system.c backlight.c display.c input.c audio.c boot.c menu.c snake.c tetris.c bricks.c launcher.c storage.c
OBJS   = $(SRCS:.c=.o)
TARGET = firmware

.PHONY: all flash clean size

all: $(TARGET).hex size

$(TARGET).elf: $(OBJS)
	$(CC) $(LDFLAGS) -o $@ $^

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

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

size: $(TARGET).elf
	$(SIZE) --mcu=$(MCU) --format=avr $<

flash: $(TARGET).hex
	$(AVRDUDE) -c $(PROGRAMMER) -p $(MCU) -U flash:w:$(TARGET).hex:i

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