##
##  spreadspace avr utils
##
##
##  Copyright (C) 2012 Christian Pointner <equinox@spreadspace.org>
##
##  This file is part of spreadspace avr utils.
##
##  spreadspace avr utils 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
##  any later version.
##
##  spreadspace avr utils 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 spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
##

ifeq ($(BOARD_TYPE),teensy1)
  MCU := at90usb162
  F_CPU := 16000000
  PROG := teensy
endif
ifeq ($(BOARD_TYPE),teensy2)
  MCU := atmega32u4
  F_CPU := 16000000
  PROG := teensy
endif
ifeq ($(BOARD_TYPE),teensy1pp)
  MCU := at90usb646
  F_CPU := 16000000
  PROG := teensy
endif
ifeq ($(BOARD_TYPE),teensy2pp)
  MCU := at90usb1286
  F_CPU := 16000000
  PROG := teensy
endif
ifeq ($(BOARD_TYPE),hhd70dongle)
  MCU := atmega32u4
  F_CPU := 16000000
  PROG := DFU
endif
ifeq ($(BOARD_TYPE),arduinoUno)
  MCU := atmega328p
  F_CPU := 16000000
  PROG := avrdude
  UPLOAD_RATE := 57600
  PROG_TYPE := stk500v1
  AVRDUDE_PORT := /dev/ttyUSB0
endif
ifeq ($(BOARD_TYPE),arduino2009v2)
  MCU := atmega328p
  F_CPU := 16000000
  PROG := avrdude
  UPLOAD_RATE := 57600
  PROG_TYPE := stk500v1
  AVRDUDE_PORT := /dev/ttyUSB0
endif
ifeq ($(BOARD_TYPE),arduino2009)
  MCU := atmega168
  F_CPU := 16000000
  PROG := avrdude
  UPLOAD_RATE := 19200
  PROG_TYPE := stk500v1
  AVRDUDE_PORT := /dev/ttyUSB0
endif
ifeq ($(BOARD_TYPE),arduino10000)
  MCU := atmega168
  F_CPU := 16000000
  PROG := avrdude
  UPLOAD_RATE := 19200
  PROG_TYPE := stk500v1
  AVRDUDE_PORT := /dev/ttyUSB0
endif
ifeq ($(BOARD_TYPE),arduinoNG)
  MCU := atmega8
  F_CPU := 16000000
  PROG := avrdude
  UPLOAD_RATE := 19200
  PROG_TYPE := stk500v1
  AVRDUDE_PORT := /dev/ttyUSB0
endif

CC = avr-gcc
OBJCOPY = avr-objcopy

DFU = dfu-programmer
teensy = teensy_loader_cli
avrdude = avrdude

## Options common to compile, link and assembly rules
COMMON = -mmcu=$(MCU)

## Compile options common for all C compilation units.
CFLAGS = $(COMMON) 
CFLAGS += -O2
CFLAGS += -funsigned-char
CFLAGS += -funsigned-bitfields
CFLAGS += -ffunction-sections
CFLAGS += -fpack-struct
CFLAGS += -fshort-enums
CFLAGS += -Wall
CFLAGS += -Wstrict-prototypes
CFLAGS += -DF_CPU=$(F_CPU)UL
CFLAGS += -D__BOARD_$(BOARD_TYPE)__

## Linker flags
LDFLAGS = $(COMMON)
LDFLAGS += 

SRC := $(OBJ:%.o=%.c)

.PHONY: clean program erase flash reset run

ELFFILE := $(NAME).elf
HEXFILE := $(NAME).hex

all: $(HEXFILE)

%.d: %.c
	@set -e; rm -f $@; \
  $(CC) -MM $(CFLAGS) $< > $@.$$$$; \
  sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
  rm -f $@.$$$$; echo '(re)building $@'

ifneq ($(MAKECMDGOALS),distclean)
-include $(SRC:%.c=%.d)
endif

%.o: %.c
	$(CC) $(CFLAGS) -c $<

$(ELFFILE): $(OBJ)
	$(CC) $(OBJ) -o $@ $(LDFLAGS)

$(HEXFILE): $(ELFFILE)
	$(OBJCOPY) -O ihex -R .eeprom -R .fuse -R .lock -R .signature $< $@

clean:
	rm -f *.o
	rm -f *.d
	rm -f *.d.*
	rm -f $(ELFFILE)
	rm -f $(HEXFILE)


### DFU-Programmer
define DFU/erase
	$(DFU) $(MCU) erase || true
endef

define DFU/flash
	$(DFU) $(MCU) flash $1
endef

define DFU/run
	$(DFU) $(MCU) start
endef

### teensy-loader
define teensy/erase
endef

define teensy/flash
	$(teensy) -mmcu=$(MCU) -w -v $1
endef

define teensy/run
endef

### avrdude
define avrdude/erase
	$(avrdude) -V -F -p $(MCU) -P $(AVRDUDE_PORT) -c $(PROG_TYPE) -b $(UPLOAD_RATE) -e
endef

define avrdude/flash
	$(avrdude) -V -F -p $(MCU) -P $(AVRDUDE_PORT) -c $(PROG_TYPE) -b $(UPLOAD_RATE) -D -U flash:w:$1
endef

define avrdude/run
endef

### Program Targets
program: reset erase flash run

erase:
	$(call $(PROG)/$@,)

flash: $(HEXFILE)
	$(call $(PROG)/$@,$(HEXFILE))

run:
	$(call $(PROG)/$@,)

reset:
	@if [ -n "$(RESET_FUNC)" ]; then  \
    if [ -x "$(RESET_FUNC)" ]; then \
      "$(RESET_FUNC)";              \
    else                            \
      echo "WARNING: ignoring non-existing or non-executable reset script"; \
    fi                              \
  fi