DEVICE = atmega328p
MCU = atmega328p
AVRDUDE_DEVICE = m328p
DEVICE ?= atmega168
MCU ?= atmega168
AVRDUDE_DEVICE ?= m168

PORT ?= /dev/ttyACM0

CFLAGS=-g -Wall $(DEVICE_SPECIFIC_CFLAGS) -Os
LDFLAGS=-Wl,-gc-sections -Wl,-relax

all: $(if $(SIM), a.out, out.hex)

SOURCES := $(filter-out sim.c, $(wildcard *.c))
HEADERS := $(filter-out sim.h, $(wildcard *.h))
include ../shared/makefile

# simulation
SIM = true
CFLAGS += $(if $(SIM), -DW2_SIM, -mcall-prologues -mmcu=$(MCU))
LDFLAGS += $(if $(SIM), , -lpololu_$(DEVICE))
PREFIX := $(if $(SIM), , avr-)
SOURCES += $(if $(SIM), sim.c, )
HEADERS += $(if $(SIM), sim.h, )

OBJECTS := $(patsubst %.c,%.o, $(SOURCES))

AVRDUDE=avrdude
CC=$(PREFIX)gcc
OBJ2HEX=$(PREFIX)objcopy

# debug build info string
BUILD_STR=$(shell git update-index -q --refresh; git describe --tags --dirty='*' --broken='x' | cut -c1-20)
CFLAGS += -DW2_BUILD_STR="$(BUILD_STR)"

clean::
	rm -f *.o out.hex a.out

a.out: $(OBJECTS)
	$(CC) $(OBJECTS) $(CFLAGS) $(LDFLAGS)

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

out.hex: a.out
	$(OBJ2HEX) -R .eeprom -O ihex $< $@
	$(info build $(BUILD_STR) complete)

flash: out.hex
	$(AVRDUDE) -p $(AVRDUDE_DEVICE) -c avrisp2 -P $(PORT) -U flash:w:out.hex

format:
	$(eval SOURCES := $(filter-out sim.c, $(SOURCES)))
	$(eval HEADERS := $(filter-out sim.h, $(HEADERS)))
	clang-format -i $(SOURCES) $(HEADERS)
	clang-tidy --fix-errors $(SOURCES) $(HEADERS)

compile_commands: clean
	bear -- make