gistfile1.mak

# Makefile
#
# Parts of this are borrowed from http://electrons.psychogenic.com
#

DEVICE=atmega324pa
CLOCK      = 20000000UL
PROGRAMMER = usbtiny
FUSES      = -U lfuse:w:0xe0:m -U hfuse:w:0xd9:m -U efuse:w:0xff:m

#############################
# Source files (use .S for assembly)

SOURCES=\
	main.S


#############################


CFLAGS=-I. -g -mmcu=$(DEVICE) -Os -DF_CPU=$(CLOCK) \
	-fpack-struct -fshort-enums             \
	-funsigned-bitfields -funsigned-char    \
	-Wall -Wstrict-prototypes               \
	-Wa,-ahlms=$(firstword                  \
	$(filter %.lst, $(<:.c=.lst)))

ASMFLAGS =-I. -mmcu=$(DEVICE) -DF_CPU=$(CLOCK) \
	-x assembler-with-cpp            \
	-Wa,-gstabs,-ahlms=$(firstword   \
		$(<:.S=.lst))

LDFLAGS=-Wl,-Map,main.out.map -mmcu=$(DEVICE)

CFILES=$(filter %.c, $(SOURCES))
ASMFILES=$(filter %.S, $(SOURCES))

OBJDEPS=$(CFILES:.c=.o)    \
	$(ASMFILES:.S=.o)

M4DEPS=$(ASMFILES:.S=_m4.S)

LST=$(filter %.lst, $(OBJDEPS:.o=.lst))

.SUFFIXES : .c .o .out .S .hex .ee.hex .h

.PHONY: writeflash clean stats gdbinit stats fuse


#############################
# Make targets:
# all, disasm, stats, hex, writeflash/install, clean, fuse

all: main.out

disasm: main.out
	avr-objdump -d main.out

stats: main.out
	avr-objdump -h main.out
	avr-size main.out 

hex: main.hex main.ee.hex

writeflash: hex
	avrdude -c $(PROGRAMMER) -p $(DEVICE) -U flash:w:main.hex:i

install: writeflash

clean:
	rm -f main.out main.out.map
	rm -f $(OBJDEPS)
	rm -f $(M4DEPS)
	rm -f $(LST)
	rm -f main.hex main.ee.hex main.elf

fuse:
	avrdude -c $(PROGRAMMER) -p $(DEVICE) $(FUSES)
	

main.out: $(M4DEPS)
	avr-gcc $(LDFLAGS) -o main.out $(M4DEPS)


#############################
# M4 Preprocessing

%_m4.S: %.S
	m4 < $< > $@


#############################
# Generating object files

#.S.o : 
#	avr-gcc $(ASMFLAGS) -c $< -o $@


#############################
# Generating hex files

# hex files from elf
.out.hex:
	avr-objcopy -j .text -j .data -O ihex $< $@

.out.ee.hex:
	avr-objcopy -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@