DEVICE  = attiny85
F_CPU   = 16500000

CFLAGS  = -Iusbdrv -I. -DDEBUG_LEVEL=0
OBJECTS = usbdrv/usbdrv.o usbdrv/usbdrvasm.o usbdrv/oddebug.o main.o
COMPILE = avr-gcc -Wall -Os -DF_CPU=$(F_CPU) $(CFLAGS) -mmcu=$(DEVICE)

.PHONY: help beeon

help: ## This help.
	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST)

.DEFAULT_GOAL := beeon

beeon: main.hex ## build firmware
	@echo "done"

main.hex: main.elf
	avr-objcopy -j .text -j .data -O ihex main.elf main.hex
	avr-size main.hex

main.elf: $(OBJECTS)
	$(COMPILE) -o main.elf $(OBJECTS)

clean: ## cleanup build output
	-rm -f main.hex main.lst main.obj main.cof main.list main.map main.eep.hex main.elf *.o usbdrv/*.o main.s usbdrv/oddebug.s usbdrv/usbdrv.s

usbdrv/usbdrv.o:
	$(COMPILE) $(SERIAL) -c usbdrv/usbdrv.c -o $@

.c.o:
	$(COMPILE) -c $< -o $@

.S.o:
	$(COMPILE) -x assembler-with-cpp -c $< -o $@

.c.s:
	$(COMPILE) -S $< -o $@

cpp:
	$(COMPILE) -E main.c