CC	= avr-gcc
OBJCOPY	= avr-objcopy
OBJDUMP	= avr-objdump
SIZE	= avr-size
NM	= avr-nm
AVRDUDE	= avrdude
RM	= rm -f
COPY	= cp

# Define all object files.
OBJ = $(SRC:.c=.o) $(ASRC:.S=.o)


# Compiler flags to generate dependency files.
GENDEPFLAGS = -MMD -MP -MF .dep/$(@F:%.o=%.d)


# Combine all necessary flags and optional flags.
# Add target processor to flags.
ALL_CFLAGS = -mmcu=$(MCU) $(CFLAGS) $(GENDEPFLAGS)

AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
AVRDUDE_BASIC = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
AVRDUDE_FLAGS = $(AVRDUDE_BASIC) $(AVRDUDE_NO_VERIFY) $(AVRDUDE_VERBOSE)

# Be silent per default, but 'make V=1' will show all compiler calls.
ifneq ($(V),1)
Q	:= @
NULL	:= 2>/dev/null
else
QP	:= \#
endif

.PHONY: elf hex lss sym size
elf: $(TARGET).elf
hex: $(TARGET).hex
lss: $(TARGET).lss
sym: $(TARGET).sym

size: $(TARGET).elf
	@$(QP)printf "  SIZE $(TARGET).elf\n"
	$(Q)$(SIZE) $(TARGET).elf

# Program the device.
.PHONY: flash fuses
flash: $(TARGET).hex
	$(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH)

fuses:
	$(AVRDUDE) $(AVRDUDE_FLAGS) -u -U hfuse:w:$(HFUSE):m -U lfuse:w:$(LFUSE):m


.SUFFIXES: .elf .hex .eep .lss .sym

%.hex: %.elf
	@$(QP)printf "  OBJCOPY $(*).hex\n"
	$(Q)$(OBJCOPY) -Oihex -R .eeprom $< $@


# Create extended listing file from ELF output file.
%.lss: %.elf
	@$(QP)printf "  OBJDUMP $@\n"
	$(Q)$(OBJDUMP) -h -S $< > $@

# Create a symbol table from ELF output file.
%.sym: %.elf
	@$(QP)printf "  NM $@\n"
	$(Q)$(NM) -n $< > $@



# Link: create ELF output file from object files.
.SECONDARY : $(TARGET).elf
.PRECIOUS : $(OBJ)
%.elf %.map: $(OBJ)
	@$(QP)printf "  LD      $@\n"
	$(Q)$(CC) $(ALL_CFLAGS) $^ --output $@ $(LDFLAGS)


# Compile: create object files from C source files.
%.o: %.c
	@$(QP)printf "  CC      $<\n"
	$(Q)$(CC) -c $(ALL_CFLAGS) $< -o $@


# Target: clean project.
.PHONY:	clean distclean
clean:
	@$(QP)printf "  CLEAN\n"
	$(Q)$(RM) $(TARGET).elf $(TARGET).lss $(TARGET).map $(TARGET).sym \
	$(OBJ) $(SRC:.c=.s) .dep/*

distclean: clean
	@$(QP)printf "  DISTCLEAN\n"
	$(Q)$(RM) $(TARGET).hex $(TARGET).tar.gz

.PHONY:	dist
dist: build
	tar cvfz $(TARGET).tar.gz \
	$(SRC) \
	$(TARGET).hex $(TARGET).eep

# Include the dependency files.
-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)