# Compile flags
CC = avr-g++

COMMON = -mmcu=$(MCU) -flto -fwhole-program

CFLAGS += $(COMMON)
CFLAGS += -Wall -Werror
CFLAGS += -Wno-error=strict-aliasing # for _invsqrt
CFLAGS += -std=gnu++98 -DF_CPU=$(CLOCK)UL -O3
CFLAGS += -funsigned-bitfields -fpack-struct -fshort-enums -funsigned-char
CFLAGS += -MD -MP -MT $@ -MF build/dep/$(@F).d
CFLAGS += -D__STDC_LIMIT_MACROS

# Linker flags
LDFLAGS += $(COMMON) -Wl,-u,vfprintf -lprintf_flt -lm
LIBS += -lm

# EEPROM flags
EEFLAGS += -j .eeprom
EEFLAGS += --set-section-flags=.eeprom="alloc,load"
EEFLAGS += --change-section-lma .eeprom=0 --no-change-warnings

# Programming flags
ifndef (PROGRAMMER)
PROGRAMMER = avrispmkII
#PROGRAMMER = jtag3pdi
endif
PDEV = usb
AVRDUDE_OPTS = -c $(PROGRAMMER) -p $(MCU) -P $(PDEV)

FUSE0=0xff
FUSE1=0x00
FUSE2=0xbe
FUSE4=0xff
FUSE5=0xeb

# Compile
build/%.o: src/%.c
	@mkdir -p $(shell dirname $@)
	$(CC) $(CFLAGS) -c -o $@ $<

build/%.o: src/%.cpp
	@mkdir -p $(shell dirname $@)
	$(CC) $(CFLAGS) -c -o $@ $<

build/%.o: src/%.S
	@mkdir -p $(shell dirname $@)
	$(CC) $(CFLAGS) -c -o $@ $<

# Link
%.hex: %.elf
	avr-objcopy -O ihex -R .eeprom -R .fuse -R .lock -R .signature $< $@

%.eep: %.elf
	avr-objcopy $(EEFLAGS) -O ihex $< $@

%.lss: %.elf
	avr-objdump -h -S $< > $@

size: $(PROJECT).elf
	@for X in A B C; do\
	  echo '****************************************************************' ;\
	  avr-size -$$X --mcu=$(MCU) $(PROJECT).elf ;\
	done

data-usage: $(PROJECT).elf
	avr-nm -CS --size-sort -t decimal $(PROJECT).elf | grep ' [BbDd] '


prog-usage: $(PROJECT).elf
	avr-nm -CS --size-sort -t decimal $(PROJECT).elf | grep -v ' [BbDd] '

# Program
reset:
	avrdude $(AVRDUDE_OPTS)

erase:
	avrdude $(AVRDUDE_OPTS) -e

program: $(PROJECT).hex
	avrdude $(AVRDUDE_OPTS) -U flash:w:$(PROJECT).hex:i

verify: $(PROJECT).hex
	avrdude $(AVRDUDE_OPTS) -U flash:v:$(PROJECT).hex:i

fuses:
	avrdude $(AVRDUDE_OPTS) -U fuse0:w:$(FUSE0):m -U fuse1:w:$(FUSE1):m \
	  -U fuse2:w:$(FUSE2):m -U fuse4:w:$(FUSE4):m -U fuse5:w:$(FUSE5):m

read_fuses:
	avrdude $(AVRDUDE_OPTS) -q -q -U fuse0:r:-:h -U fuse1:r:-:h -U fuse2:r:-:h \
	  -U fuse4:r:-:h -U fuse5:r:-:h

signature:
	avrdude $(AVRDUDE_OPTS) -q -q -U signature:r:-:h

prodsig:
	avrdude $(AVRDUDE_OPTS) -q -q -U prodsig:r:-:h

usersig:
	avrdude $(AVRDUDE_OPTS) -q -q -U usersig:r:-:h

# Clean
tidy:
	rm -f $(shell find -name \*~ -o -name \#\*)

clean: tidy
	rm -rf $(PROJECT).elf $(PROJECT).hex $(PROJECT).eep $(PROJECT).lss \
	  $(PROJECT).map build

.PHONY: tidy clean size reset erase program fuses read_fuses prodsig
.PHONY: signature usersig data-usage prog-usage

# Dependencies
-include $(shell mkdir -p build/dep) $(wildcard build/dep/*)