CC ?= avr-gcc
OBJCOPY ?= avr-objcopy
AVRDUDE ?= avrdude
QEMU_AVR ?= qemu-system-avr

MCU ?= atmega32u4
SIM_MCU ?= atmega2560
COMMON_CFLAGS += -Wall -Wextra -DF_CPU=16000000UL
CFLAGS += $(COMMON_CFLAGS) -mmcu=$(MCU) -O3
SIM_CFLAGS += $(COMMON_CFLAGS) -mmcu=$(SIM_MCU) -g3 -gdwarf-2 -DWDT_DISABLE

COMMON_LDFLAGS += -Wl,-u,vfprintf -lprintf_flt
LDFLAGS += $(COMMON_LDFLAGS) -mmcu=$(MCU)
SIM_LDFLAGS += $(COMMON_LDFLAGS) -mmcu=$(SIM_MCU)

$(shell mkdir -p build/{real,sim})

all: build/altimeter_sim.elf build/altimeter.hex

emu: build/altimeter_sim.elf
	$(QEMU_AVR) -s -S -nographic -machine mega2560 -bios $<

flash: build/altimeter.hex
	$(AVRDUDE) -F -V -c avr109 -p $(MCU) -P $(PORT) -b 115200 -U flash:w:$<

clean:
	rm -rf build/

build/altimeter.elf: \
	build/real/barometer_sim.o \
	build/real/display_sim.o \
	build/real/altimeter.o \
	build/real/util.o
	$(CC) -o $@ $^ $(LDFLAGS)

build/altimeter_sim.elf: \
	build/sim/barometer_sim.o \
	build/sim/display_sim.o \
	build/sim/altimeter.o \
	build/sim/util.o
	$(CC) -o $@ $^ $(SIM_LDFLAGS)

include config.mk


build/sim/%.o: %.c
	$(CC) -c -o $@ $^ $(SIM_CFLAGS)

build/real/%.o: %.c
	$(CC) -c -o $@ $^ $(CFLAGS)

build/%.hex: build/%.elf
	$(OBJCOPY) -O ihex -R .eeprom $< $@

build/%.elf:
	$(CC) -o $@ $^ $(CFLAGS)


.PHONY: all emu flash clean