# makefile
#
# written by Guido Socher
# http://www.linuxfocus.org/Deutsch/November2004/article352.shtml
#
# license: GPL (http://www.gnu.org/licenses/gpl.txt)
#
# some tiny changes by mikrocontrollerspielwiese.de

MCU=atmega8
CC=avr-gcc
OBJCOPY=avr-objcopy

# optimize for size:
CFLAGS=-g -mmcu=$(MCU) -Wall -Wstrict-prototypes -Os -mcall-prologues

#-------------------
all: test1.hex

#-------------------
help: 
	@echo "Usage: make all|load|rdfuses|wrfuse1mhz|wrfuse4mhz|wrfusecrystal"
	@echo "Warning: you will not be able to undo wrfusecrystal unless you connect an"
	@echo "         external crystal! uC is dead after wrfusecrystal if you do not"
	@echo "         have an external crystal."
	
#-------------------
test1.hex : test1.out 
	$(OBJCOPY) -R .eeprom -O ihex test1.out test1.hex 
test1.out : test1.o 
	$(CC) $(CFLAGS) -o test1.out -Wl,-Map,test1.map test1.o 
test1.o : test1.c 
	$(CC) $(CFLAGS) -Os -c test1.c
	
#------------------
load: test1.hex
	./prg_load_uc test1.hex

#-------------------
# fuse byte settings:
#  Atmel AVR ATmega8 
#  Fuse Low Byte      = 0xe1 (1MHz internal), 0xe3 (4MHz internal), 0xe4 (8MHz internal)
#  Fuse High Byte     = 0xd9 
#  Factory default is 0xe1 for low byte and 0xd9 for high byte
# Check this with make rdfuses
rdfuses:
	./prg_fusebit_uc -r
	
# use internal RC oscillator 1 Mhz
wrfuse1mhz:
	./prg_fusebit_uc -w 1
	
# use internal RC oscillator 4 Mhz
wrfuse4mhz:
	./prg_fusebit_uc -w 4
	
# use external 3-8 Mhz crystal
# Warning: you can not reset this to intenal unless you connect a crystal!!
wrfusecrystal:
	@echo "Warning: The external crystal setting can not be changed back without a working crystal"
	@echo "         You have 3 seconds to abort this with crtl-c"
	@sleep 3
	./prg_fusebit_uc -w 0
	
#-------------------
clean:
	rm -f *.o *.map *.out *.hex
	
#-------------------
