# Name: Makefile
# Author: Justin R. Cutler <justin.r.cutler@gmail.com>
# Copyright: 2012 Justin R. Cutler
# License: GPLv3
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

# This is a prototype Makefile. Modify it according to your needs.
# You should at least check the settings for
# DEVICE ....... The AVR device you compile for
# CLOCK ........ Target AVR clock rate in Hertz
# OBJECTS ...... The object files created from your source files. This list is
#                usually the same as the list of source files with suffix ".o".
# PROGRAMMER ... Options to avrdude which define the hardware you use for
#                uploading to the AVR and the interface where this hardware
#                is connected. We recommend that you leave it undefined and
#                add settings like this to your ~/.avrduderc file:
#                   default_programmer = "stk500v2";
#                   default_serial = "avrdoper";
# FUSES ........ Parameters for avrdude to flash the fuses appropriately.

DEVICE     = attiny85
CLOCK      = 1000000
PROGRAMMER = #-c stk500v2 -P avrdoper
OBJECTS    = main.o
FUSES      = -U hfuse:w:0xdf:m -U lfuse:w:0x62:m

# ATtiny85 fuse bits used above (fuse bits for other devices are different!):
# Example for 1 MHz internal oscillator
# Fuse high byte:
# 0xdf = 1 1 0 1   1 1 1 1
#        ^ ^ ^ ^   ^ \-+-/
#        | | | |   |   +------ BODLEVEL 2..0 (disabled)
#        | | | |   +---------- EESAVE (EEPROM not preserved over chip erase)
#        | | | +-------------- WDTON (watchdog not always on)
#        | | +---------------- SPIEN (serial programming is enabled)
#        | +------------------ DWEN (DebugWIRE disabled)
#        +-------------------- RSTDISBL (RESET pin enabled)
# Fuse low byte:
# 0x62 = 0 1 1 0   0 0 1 0
#        ^ ^ \ /   \--+--/
#        | |  |       +------- CKSEL 3..0 (8MHz internal RC)
#        | |  +--------------- SUT 1..0 (slowly rising power)
#        | +------------------ CKOUT (clock output disabled)
#        +-------------------- CKDIV8 (clock divided by 8)
#
# For computing fuse byte values for other devices and options see
# the fuse bit calculator at http://www.engbedded.com/fusecalc/


# Tune the lines below only if you know what you are doing:

AVRDUDE = avrdude $(PROGRAMMER) -p $(DEVICE)
COMPILE = avr-gcc -Wall -Os -DF_CPU=$(CLOCK) -mmcu=$(DEVICE)

# symbolic targets:
all:	main.hex

.c.o:
	$(COMPILE) -c $< -o $@

.S.o:
	$(COMPILE) -x assembler-with-cpp -c $< -o $@
# "-x assembler-with-cpp" should not be necessary since this is the default
# file type for the .S (with capital S) extension. However, upper case
# characters are not always preserved on Windows. To ensure WinAVR
# compatibility define the file type manually.

.c.s:
	$(COMPILE) -S $< -o $@

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

fuse:
	$(AVRDUDE) $(FUSES)

# Xcode uses the Makefile targets "", "clean" and "install"
install: flash fuse

# if you use a bootloader, change the command below appropriately:
load: all
	bootloadHID main.hex

clean:
	rm -f main.hex main.elf $(OBJECTS)

# file targets:
main.elf: $(OBJECTS)
	$(COMPILE) -o main.elf $(OBJECTS)

main.hex: main.elf
	rm -f main.hex
	avr-objcopy -j .text -j .data -O ihex main.elf main.hex
	avr-size --format=avr --mcu=$(DEVICE) main.elf
# If you have an EEPROM section, you must also create a hex file for the
# EEPROM and add it to the "flash" target.

# Targets for code debugging and analysis:
disasm:	main.elf
	avr-objdump -d main.elf

cpp:
	$(COMPILE) -E main.c