new targets: size, eeprom, bootlader, debug

firmware/Makefile

@@ -1,18 +1,24 @@
+# Arduino Nano with ATmega328P programming script
+# detailed configuration on http://arduino.cc/en/uploads/Main/boards.txt
 # required packages: avrdude gcc-avr avr-libc
-# the atmega firmware binary to output
+
+# the output firmware name
 TARGET=scale
 # to compile
 CC=avr-gcc
 OBJDUMP=avr-objdump
 OBJCOPY=avr-objcopy
+SIZE=avr-size
 CFLAGS=-g -Wall -Werror -O3 -std=c99
-# the target
+# the target (arduino nano)
 DEVICE=atmega328p
 F_CPU=16000000UL
 # the flasher
 PROGRAMMER=arduino
 PORT=/dev/ttyUSB0
-# to flash (specially for the arduino, with DTR pulse ot reset)
+# to flash
+# use the aduino bootlaoder, with a baudrate of 57600
+# reset the device to start bootlaoder
 FLASHER=avrdude -p $(DEVICE) -c $(PROGRAMMER) -P $(PORT) -b 57600 -D
 # source files to compile
 SRC = $(wildcard *.c)
@@ -24,30 +30,54 @@ OBJ = $(SRC:.c=.o)
 LST = $(SRC:.c=.lst)
 
 all: compile $(TARGET).lst flash
+	echo "EEPROM has to be programmed separately"
 
+debug: CFLAGS += -DDEBUG
+debug: all
+
+# reset board by setting DTR
+# the capacitor on DTR with create a pulse on RESET
+# after reset the bootloader is start
+# the bootloader can be used to reflash the device
 reset:
 	stty 57600 raw ignbrk hup < $(PORT)
 
-flash: compile reset
+# flash the device using the internal bootloader
+flash: $(TARGET).hex reset
 	$(FLASHER) -U flash:w:$(TARGET).hex:i
 
-compile: $(TARGET).hex
+# write EEPROM on the device
+eeprom: $(TARGET)_eeprom.hex reset
+	$(FLASHER) -U eeprom:w:$(TARGET)_eeprom.hex:i
 
-# compile
+# write bootloader and fuses
+bootloader:
+	wget http://code.google.com/p/arduino/source/browse/trunk/hardware/arduino/bootloaders/atmega/ATmegaBOOT_168_atmega328.hex
+	avrdude -p $(DEVICE) -c usbtiny	-U lfuse:w:0xff:m -U hfuse:w:0xda:m -U efuse:w:0x05:m -U flash:w:ATmegaBOOT_168_atmega328.hex:i
+	rm ATmegaBOOT_168_atmega328.hex
+
+# create main target firmware
+compile: $(TARGET).elf
+	$(SIZE) --format=avr --mcu=$(DEVICE) $(TARGET).elf
+
+# compile source files
 %.o: %.c %.h
 	$(CC) $(CFLAGS) -I. -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) -c -o $@ $<
 
-# link
+# link compiled files
 %.elf: $(OBJ)
 	$(CC) $(CFLAGS) -I. -mmcu=$(DEVICE) -DF_CPU=$(F_CPU) -Wl,-Map=$(TARGET).map,--cref -o $@ $(OBJ)
 
-# extended listing
+# create extended listing for additional information
 %.lst: %.elf
-	$(OBJDUMP) -h -S $< > $@
+	$(OBJDUMP) --section-headers --source $< > $@
 
-# output file
+# create flashable ihex from firmware
 %.hex: %.elf
-	$(OBJCOPY) -j .text -j .data -O ihex $< $@
+	$(OBJCOPY) --only-section .text --only-section .data --output-target ihex $< $@
+
+%_eeprom.hex: %.elf
+	$(OBJCOPY) --only-section .eeprom --change-section-lma .eeprom=0 --output-target ihex $< $@
 
 clean:
-	rm -f $(TARGET) $(TARGET).hex $(TARGET).elf $(TARGET).lst $(TARGET).map  $(LST) $(OBJ)
+	rm -f $(TARGET) $(TARGET).hex $(TARGET).elf $(TARGET).lst $(TARGET).map $(LST) $(OBJ)