OPTIMIZE = -O2
CPPFLAGS += -DF_CPU=$(MCU_FREQ)
override CFLAGS = -g --std=c99 -Wall $(OPTIMIZE) -mmcu=$(MCU_TARGET)
override LDFLAGS =
AVRDUDE_ARGS =

# programs we are gonna use
CC = avr-gcc
OBJCOPY = avr-objcopy
OBJDUMP = avr-objdump
SIZE = avr-size
AVRDUDE = avrdude

ifdef BOARD
include boards/$(BOARD).mk
endif

ifdef BAUDRATE
CPPFLAGS += -DBAUDRATE=$(BAUDRATE)
endif

default: $(PROG).hex

clean:
	rm -rf *.o drivers/*.o *.elf *.lst *.hex *.bin *.asm

# automatic dependencies
include deps.mk
deps.mk: *.c drivers/*.c
	for i in *.c; do echo $${i%.c}.elf: $$(./finddeps.sh "$$i"); echo; done > deps.mk

# generic rules
%.o: %.c
	$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $^

%.elf: %.o $(DRIVER_OBJ:.c=.o)
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
	$(SIZE) $@

%.lst: %.elf
	$(OBJDUMP) -h -S $< > $@

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

%.bin: %.elf
	$(OBJCOPY) -j .text -j .data -O binary $< $@

%.asm: %.elf
	$(OBJDUMP) -z -j .text -m avr5 -d $< > $@

# flashing definitions and helper target
AVRDUDE_ARGS += -p$(MCU_TARGET)
AVRDUDE_ARGS += -c$(AVRDUDE_TYPE)

ifdef AVRDUDE_TTY
AVRDUDE_ARGS += -P$(AVRDUDE_TTY)
endif

ifdef AVRDUDE_BAUD
AVRDUDE_ARGS += -b$(AVRDUDE_BAUD)
endif

ifdef AVRDUDE_TYPE
reset:
	$(AVRDUDE) $(AVRDUDE_ARGS)

flash: $(PROG).hex
	$(AVRDUDE) $(AVRDUDE_ARGS) -U flash:w:$(PROG).hex
endif

# serial console
ifeq ($(COM),picocom)
serial:
	$(COM) -b $(BAUDRATE) $(AVRDUDE_TTY)
endif
ifeq ($(COM),screen)
serial:
	$(COM) $(AVRDUDE_TTY) $(BAUDRATE)
endif