MCU := atmega328p
CLOCK := 16000000
CC := avr-gcc
CFLAGS := -Wall -std=c99 -Os -ffunction-sections -fdata-sections -mmcu=$(MCU) -DF_CPU=$(CLOCK) $(patsubst %,-D%,$(FEATURES)) -I../common
LDFLAGS := -Os -Wl,--gc-sections -mmcu=$(MCU)
AVRDUDE := avrdude
OBJCOPY := avr-objcopy
DEVICE := /dev/ttyUSB0
ifeq ($(MCU),atmega168)
BAUD := 19200
else
BAUD := 57600
endif

VPATH := ../common

help:
	@echo "Targets:"
	@echo "  %.hex:    Build firmware from %.c"
	@echo "  upload-%: Upload firmware to AVR"
	@echo "  clean:    Clean all built files"
	@echo
	@echo "Variables:"
	@echo "  MCU:      Microcontroller type"
	@echo "            Arduino Duemilanove = atmega328p (default)"
	@echo "            Arduino Mini = atmega168"

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

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

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

upload-%: %.hex
	$(AVRDUDE) -p$(MCU) -carduino -P$(DEVICE) -b$(BAUD) -D -Uflash:w:$<:i

clean:
	$(RM) *.hex
	$(RM) *.elf
	$(RM) *.o