# Makefile.isp for Optiboot
# Bill Westfield (WestfW@yahoo.com)  March, 2013
# $Id$
#
# Instructions:
#
# This is a "daughter" Makefile that burns the bootloader using a ISP
# device programmer.  It is designed to inherit assorted variables from
# the parent optiboot "Makefile"...  Using a daughter makefile makes
# certain variable manipulations more obvious.
#
# To burn bootloader .hex file, invoke the main Makefile using:
# make diecimila_isp
# make lilypad_isp
# make ng_isp
# etc...
#
#
# Note: inherit paths/etc from parent Makefile.
#
#---------------------------------------------------------------------------
# 
# * Copyright 2013-2015 by Bill Westfield.  Part of Optiboot.
# * This software is licensed under version 2 of the Gnu Public Licence.
# * See optiboot.c for details.
# 
#---------------------------------------------------------------------------

# enter the parameters for the avrdude isp tool  -b19200
#

# Inherit avrdude paths from top-level makefile
AVRDUDE_ROOT ?= $(GCCROOT)
AVRDUDE_CONF ?= -C$(TOOLROOT)/avr/etc/avrdude.conf

# Default filename for the selected target
FILENAME     ?= $(PROGRAM)_$(TARGET).hex

# These are the parameters for a usb-based STK500v2 programmer.
# Exact type unknown.  (historical Makefile values.)
#ISPTOOL	   = stk500v2
#ISPPORT	   =  usb
#ISPSPEED   = -b 115200
#
#
# These are parameters for using an Arduino with the ArduinoISP sketch
#  as the programmer.  On a mac, for a particular Uno as programmer.
ISPTOOL	?= stk500v1
ISPPORT	?= /dev/tty.usbserial-FTD61T6Q
ISPSPEED ?= -b19200



# Not all chips have EFUSE.

ifdef EFUSE
EFUSE_CMD= -U efuse:w:0x$(EFUSE):m
endif

# Default lock fuse configuration (NO lock)
LOCKFUSE ?= 2f# APP protect mode 1, BL protect mode 1

#
# avrdude commands to erase chip, unlock memory, and program fuses.
#
ISPFUSES =	-e -u -U lock:w:0x$(LOCKFUSE):m $(EFUSE_CMD) \
	 	-U hfuse:w:0x$(HFUSE):m -U lfuse:w:0x$(LFUSE):m


#
# avrdude commands to program the new bootloader, and protect the bootloader
# space from accidental SPM writes.  Note: "2f" allows boot section to be read
# by the application, which is different than the arduino default.
#
ISPFLASH =	-U flash:w:$(FILENAME) -U lock:w:$(LOCKFUSE):m

# There are certain complicated caused by the fact that the default state
# of a fuse is a "1" rather than a "0", especially with respect to fuse bits
# that have not been implemented.  Those would normally not be included, but
# unimplemented fuses still default to being "1"
#
# the efuse should really be 0xf8; since, however, only the lower
# three bits of that byte are used on the atmega168, avrdude gets
# confused if you specify 1's for the higher bits, see:
# http://tinker.it/now/2007/02/24/the-tale-of-avrdude-atmega168-and-extended-bits-fuses/
#
# similarly, the lock bits should be 0xff instead of 0x3f (to
# unlock the bootloader section) and 0xcf instead of 0x2f (to
# lock it), but since the high two bits of the lock byte are
# unused, avrdude would get confused.

isp: $(FILENAME)
	$(AVRDUDE_ROOT)avrdude $(AVRDUDE_CONF) -c $(ISPTOOL) \
              -p $(MCU_TARGET) -P $(ISPPORT) $(ISPSPEED) \
	$(ISPFUSES) \
	$(ISPFLASH)