CC=avr-gcc
CFLAGS=-mmcu=$(MMCU) -Wall -Os -DF_CPU=$(F_CPU)

MMCU=attiny45
PROGRAMMER=avr910
DEVICE=/dev/ttyUSB0
F_CPU=1000000

MAIN=coaster
SOURCES=$(MAIN).cpp

all: $(MAIN).hex

# Implicit rule to create hex files from source files
%.hex: %.out
  # $< is the first dependency
  # $@ is the left side of the rule
	avr-objcopy -O ihex $< $@
	avr-size --mcu=$(MMCU) --format=avr $<

%.out: $(SOURCES)
	$(CC) $(CFLAGS) -I./ $< -o $@ -std=c++11

program: $(MAIN).hex
	avrdude -p t45 -P $(DEVICE) -c $(PROGRAMMER) -U flash:w:$<

clean:
	rm *.hex