Makefile

CC = avr-gcc
PROCESSOR = atmega328p
FREQ = 16000000
AVRDUDE_CONFIG = arduino
AVRDUDE_PART = ATMEGA328P
AVRDUDE_PROGRAMMING_DEVICE = /dev/tty.usbmodem1421
AVRDUDE_BAUD = 115200

all: buildhex

clean:
        rm *.o *.hex blink

build:
        $(CC) -Os -DF_CPU=$(FREQ)UL -mmcu=$(PROCESSOR) blink.c

buildhex: build
        avr-objcopy -O ihex -R .eeprom blink blink.hex

flash: buildhex
        avrdude -F -V -c $(AVRDUDE_CONFIG) -p $(AVRDUDE_PART) -P $(AVRDUDE_PROGRAMMING_DEVICE) -b $(AVRDUDE_BAUD) -U flash:w:blink.hex