PROGRAMMER:= usbtiny
PROGRAMMER_PORT:= usb

CC:=avr-gcc
OBJCOPY:=avr-objcopy
AVRDUDE:=avrdude
CFLAGS:= -Os -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Wextra -Wall -Wstrict-prototypes -std=gnu99 -ggdb
LIBS:=
HOSTCC:=gcc

#Fuse Settings
LFUSE:=0xBF
HFUSE:=0xDD
EFUSE:=0x00

# Source filenames
FILES:=soil_sensor.c bus.c light.c humidity.c time.c moisture.c crc.c
BT_FILES:=bootloader/bootloader.c bootloader/bus.c bootloader/crc.c bootloader/light.c

BOOTSTART = 0x1800
BTLDFLAGS += -Wl,--section-start=.text=$(BOOTSTART)


.PHONY: clean fuses download bootloader download-bootloader download-combo all newdevice

# By default, compile and download both bootloader and main program.
all: download-combo
bootloader: bootloader.bin download-bootloader
newdevice: fuses download-combo

# Burn fuses
fuses:
	@$(AVRDUDE) -p atmega88pb -c $(PROGRAMMER) -P $(PROGRAMMER_PORT) -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m

# Compile and Link Bootloader
bootloader.bin: $(BT_FILES)
ifndef BREV
	@$(error Board revision is not set. Use BREV=2, BREV=4, or BREV=5 on the make command line.)
endif
	@$(CC) -mmcu=atmega88pb $(CFLAGS) -DBREV=$(BREV) -I. $(BT_FILES) -o bootloader.elf $(LIBS) $(BTLDFLAGS)
	@$(OBJCOPY) -O binary -R .eeprom bootloader.elf bootloader.bin
	@$(OBJCOPY) -O ihex -R .eeprom bootloader.elf bootloader.hex

# Compile & link main program
main.bin: $(FILES)
ifndef BREV
	@$(error Board revision is not set. Use BREV=2, BREV=4, or BREV=5 on the make command line.)
endif
	@$(CC) -mmcu=atmega88pb $(CFLAGS) -DBREV=$(BREV) -I. -T ldscript-avr4-mainprogram-custom.x $(FILES) -o main.elf $(LIBS) 
	@$(OBJCOPY) -O binary -R .eeprom main.elf main.bin

# Download main program, without changing fuses or eeprom.
download: main.bin
	@$(AVRDUDE) -p atmega88pb -c $(PROGRAMMER) -P $(PROGRAMMER_PORT) -U flash:w:main.bin:r

# Download bootloader, without changing fuses or eeprom.
download-bootloader: bootloader.bin
	@$(AVRDUDE) -p atmega88pb -c $(PROGRAMMER) -P $(PROGRAMMER_PORT) -U flash:w:bootloader.hex:i
	
# Download both bootloader and main program
download-combo: main.bin bootloader.bin tools/crc-calc
	@cp main.bin combo.bin
	@dd if=bootloader.bin of=combo.bin conv=notrunc seek=6144 bs=1
	@tools/crc-calc combo.bin
	@$(AVRDUDE) -p atmega88pb -c $(PROGRAMMER) -P $(PROGRAMMER_PORT) -U flash:w:combo.bin:r
	
# Build crc-calc for setting the CRC on the combined firmware file
tools/crc-calc: tools/crc-calc.c
	@$(HOSTCC) tools/crc-calc.c -o tools/crc-calc -Wall -std=gnu99 -ggdb

#Delete generated files
clean:
	@rm -f *.hex *.elf *.bin