Avr makefile

# the output binary name (found in ./bin)
ELFOUT:=main.elf
HEXOUT:=main.hex
 
# the source files you wish to use (without the '.c') - main.c is added later
SRCS:=
 
# which device are you using?
DEVICE:=atmega328p
 
# what protocol do you use to communicate with the IC?
AVRDUDE_PROTO:=stk500v1
#AVRDUDE_PROTO:=buspirate
 
# which serial port is it connected to?
AVRDUDE_PORT:=/dev/ttyUSB0
AVRDUDE_BAUD:=57600
 
###################################################################################
# There should be no need to change below here for most projects
 
DIRS:=bin obj hex
SRCS+=main
OPTIMISATION:=-fwhole-program \
              -falign-functions \
              -falign-jumps \
              -falign-labels \
              -falign-loops \
              -fif-conversion2 \
              -finline-functions \
              -fregmove \
              -frename-registers \
              -freorder-blocks \
              -freorder-functions \
              -fsplit-wide-types \
              -ftoplevel-reorder \
              -funroll-all-loops \
              -fvariable-expansion-in-unroller
CROSS_COMPILE:=avr-
CC:=$(CROSS_COMPILE)gcc
OBJCOPY:=$(CROSS_COMPILE)objcopy
CFLAGS:=$(OPTIMISATION) -mmcu=$(DEVICE) -c -Wall -O9
CLINKS:=$(OPTIMISATION) -mmcu=$(DEVICE)
 
.PHONY: all new clean spotless .dirs upload download
 
all: .dirs ./hex/$(HEXOUT)
 
new: clean ./hex/$(HEXOUT)
 
clean:
	rm -f *~
	rm -f ./hex/$(HEXOUT)
	rm -f ./bin/$(ELFOUT)
	rm -f ./obj/*.o
 
spotless: clean
	rm -rdf $(addprefix ./,$(DIRS)) .dirs
.dirs: makefile
	mkdir -p $(addprefix ./,$(DIRS))
	@touch .dirs
 
 
upload: ./hex/$(HEXOUT)
	avrdude -c$(AVRDUDE_PROTO) -P$(AVRDUDE_PORT) -b$(AVRDUDE_BAUD) -D -Uflash:w:./hex/$(HEXOUT):a
 
download:
	rm ./hex/$(HEXOUT).downloaded
	avrdude -c$(AVRDUDE_PROTO) -P$(AVRDUDE_PORT) -b$(AVRDUDE_BAUD) -D -Uflash:r:./hex/$(HEXOUT).downloaded:a
 
 
./hex/$(HEXOUT): ./bin/$(ELFOUT)
	$(OBJCOPY) -j .text -O ihex $^ $@
./bin/$(ELFOUT): $(addprefix ./obj/,$(addsuffix .o,$(SRCS))) makefile
	$(CC) $(CLINKS) $(filter %.o,$^) -o $@
 
./obj/%.o: %.c %.h makefile
	$(CC) $(CFLAGS) $*.c -o $@
./obj/%.o: %.c makefile
	$(CC) $(CFLAGS) $*.c -o $@