# required packages
# sudo aptitude install avrdude gcc-avr avr-libc
# the program
PROG=ir-cock-grenade
# to compile
CC=avr-gcc
OBJDUMP=avr-objdump
OBJCOPY=avr-objcopy
CFLAGS=-g -Wall -O3
# the target
#DEVICE=atmega328p
DEVICE=attiny85
F_CPU=1000000
# the port to flash
#PORT=/dev/ttyUSB0
# the flasher
#PROGRAMMER=buspirate
PROGRAMMER=usbtiny
# to flash
#AVRDUDE=avrdude -p $(DEVICE) -P $(PORT) -c $(PROGRAMMER)
AVRDUDE=avrdude -p $(DEVICE) -c $(PROGRAMMER) -B 50

all: prog

prog: verify $(PROG).c
	$(CC) $(CFLAGS) -I. -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) -o $(PROG) $(PROG).c
	$(OBJDUMP) -h -S $(PROG) > $(PROG).lst
	$(OBJCOPY) -j .text -j .data -O ihex $(PROG) $(PROG).hex

# Fuse extended byte:
# 0x07 = - - - -   - 1 1 1
#                    \-+-/
#                      +------ BODLEVEL 2..0 (Brown-out Detector trigger level -> disabled)
#
# Fuse high byte:
# 0xdf = 1 1 0 1   1 1 1 1
#        ^ ^ ^ ^   ^ \+/ ^
#        | | | |   |  |  +---- BOOTRST (Select Reset Vector -> jump to application at start)
#        | | | |   |  +------- BOOTSZ 1..0 (Select Boot Size -> 256 words starting at 0x3F00)
#        | | | |   +---------- EESAVE (preserve EEPROM on Chip Erase -> not preserved)
#        | | | +-------------- WDTON (watchdog timer always on -> disable)
#        | | +---------------- SPIEN (enable serial programming -> enabled)
#        | +------------------ DWEN (debug wire enable -> enabled)
#        +-------------------- RSTDISBL (disable external reset -> reset disabled)
#
# Fuse low byte:
# 0x62 = 0 1 1 0   0 0 1 0
#        ^ ^ \+/   \--+--/
#        | |  |       +------- CKSEL 3..0 (clock selection -> Internal RC oscillator)
#        | |  +--------------- SUT 1..0 (BOD enabled, fast rising power)
#        | +------------------ CKOUT (clock output on CKOUT pin -> disabled)
#        +-------------------- CKDIV8 (divide clock by 8 -> divide)
burn-fuse:
	$(AVRDUDE) -U efuse:w:0x07:m -U hfuse:w:0xdf:m -U lfuse:w:0x62:m

read-fuse:
	$(AVRDUDE) -U efuse:r:efuse.raw:r -U hfuse:r:hfuse.raw:r -U lfuse:r:lfuse.raw:r

flash:
	$(AVRDUDE) -U flash:w:$(PROG).hex:i

read-flash:
	$(AVRDUDE) -U flash:r:flash_dump.hex:i

flash: prog load
install : prog load
load:
	$(AVRDUDE) -U flash:w:$(PROG).hex:i

clean:
	rm -f $(PROG) *.hex *.lst

verify:
	$(AVRDUDE)
	if [ $$? -eq 0 ]; then \
		echo "avrdude configured correctly"; \
	else \
		echo "avrdude not configured correctly in Makefile"; \
		exit 1; \
	fi