makefile

CC = avr-gcc
OBJCPY = avr-objcopy
SIZE = avr-size
MCU = atmega328p
F_CPU = 16000000
U8G2_SRC = u8g2_csrc
CFLAGS = \
	-mmcu=$(MCU) \
	-DF_CPU=$(F_CPU)UL \
	-Os \
	-std=gnu99 \
	-Werror \
	-ffunction-sections \
	-fdata-sections \
	-I $(U8G2_SRC)/ \
	-I lib/ \
	-DAVR_USE_HW_I2C 

LDFLAGS = \
	-Wl,--gc-sections \
	-mmcu=$(MCU)

AVRDUDE=avrdude
#select serial port 
PORT=/dev/ttyUSB0

SRC = $(shell ls $(U8G2_SRC)/*.c) $(shell ls lib/*.c) $(shell ls lib/avr-hw-i2c/*.c) $(shell ls *.c)

OBJ = $(SRC:.c=.o)

main.hex: main.elf
	$(OBJCPY) -O ihex -R .eeprom main.elf main.hex

main.elf: $(OBJ)
	$(CC) $(CFLAGS) $(LDFLAGS) $(OBJ) -o $@ 

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

clean:
	rm -f $(OBJ) main.elf main.hex

# Example for Arduino Duemilanove
upload: main.hex
	$(AVRDUDE) -F -v -p $(MCU) -c arduino -P $(PORT) -b 115200 -U flash:w:main.hex:i