MCU=attiny13
# MCU=attiny24A # this is for tests of >1kB firmware
CC=avr-gcc -mmcu=$(MCU) -I$(INCLUDE_DIRS) -Os -fshort-enums
INCLUDE_DIRS=autoinclude
MAKEHEX=avr-objcopy -O ihex
AVRDUDE=avrdude

# Make sure the programmer port is correct for you! For security reasons, we do
# not script automatic port detection here. Please find the correct port
# manually and change the variable PROGRAMMER_TTY here accordingly.
ifeq ($(OS),Windows_NT)
    # Use the command `mode` to find the COM port on Windows.
    PROGRAMMER_TTY=COM3
else
    # Use the command `ls /dev/ttyUSB*` to find the port on Linux. Please make sure
    # the correct /dev/ttyUSBx has write permissions for everyone (at least 0666).
    # If for some reason you cannot change those, change the line
    # 	AVRDUDE=avrdude 
    # above to 
    # 	AVRDUDE=sudo avrdude
    # and program the chip with sudo permissions.
    PROGRAMMER_TTY=/dev/ttyUSB0
endif

# Make sure this is your programmer board. We assume STK500 as the default.
PROGRAMMER_BOARD=avrisp
# Only stk500 and avrisp (Arduino ISP) have been tested, so you will have to
# set the PROGRAMMER_BAUDRATE variable manually if you use any other
# programmer.

ifeq ($(PROGRAMMER_BOARD),stk500)
    PROGRAMMER_BAUDRATE=115200
endif
ifeq ($(PROGRAMMER_BOARD),avrisp)
    # Arduino ISP - a DIY programmer made from Arduino, see
    # https://docs.arduino.cc/built-in-examples/arduino-isp/ArduinoISP
    PROGRAMMER_BAUDRATE=19200
endif

all: build/main.hex


build:
	mkdir -p build

burn:
	mkdir -p burn

autoinclude:
	mkdir -p autoinclude

autoinclude/tinyqirx_conf.auto.h: conf/tinyqirx.conf autoinclude bin/generate_precalculation_header.py
	python bin/generate_precalculation_header.py $< $@

build/main.hex: build/main.o
	avr-size --mcu=$(MCU) build/main.o
	$(MAKEHEX) $< $@

build/main.cc: src/main.c src/tinyqirx_core.c src/tinyqirx.c src/tinyqirx_utils.c autoinclude/tinyqirx_conf.auto.h
	$(CC) -E $< -o $@

build/main.S: src/main.c src/tinyqirx_core.c src/tinyqirx.c src/tinyqirx_utils.c autoinclude/tinyqirx_conf.auto.h
	$(CC) -S $< -o $@

build/main.o: src/main.c build src/tinyqirx_core.c src/tinyqirx.c src/tinyqirx_utils.c autoinclude/tinyqirx_conf.auto.h
	$(CC) $< -o $@

.PHONY: install clean asm readfuses

# For some reason, this command is prone to yielding "Unexpected Device
# signature, 0x0000" and "Verification error, first mismatch at byte 0x0000"
# errors.  Just run it multiple times until succeeded. If it does not, try
# moving the wires.
install: build/main.hex
	$(AVRDUDE) -c $(PROGRAMMER_BOARD) -p $(MCU) -P $(PROGRAMMER_TTY) -b $(PROGRAMMER_BAUDRATE) -U flash:w:$<:i -F



burn/ensure_write.txt: burn
	touch burn/ensure_write.txt

writefuses: burn/writehfuse.hex burn/writelfuse.hex
#	$(AVRDUDE) -c $(PROGRAMMER_BOARD) -p $(MCU) -P $(PROGRAMMER_TTY) -b $(PROGRAMMER_BAUDRATE) -U hfuse:w:burn/writehfuse.hex:i -F
	$(AVRDUDE) -c $(PROGRAMMER_BOARD) -p $(MCU) -P $(PROGRAMMER_TTY) -b $(PROGRAMMER_BAUDRATE) -U lfuse:w:burn/writelfuse.hex:i -F

burn/writehfuse.hex: burn/writehfuse.bin
	avr-objcopy -O ihex -I binary $< $@

burn/writelfuse.hex: burn/writelfuse.bin
	avr-objcopy -O ihex -I binary $< $@

burn/writehfuse.bin: setfuse/hfuse.txt
	xxd -ps -r $< > $@

burn/writelfuse.bin: setfuse/lfuse.txt
	xxd -ps -r $< > $@

burn/ensure_read.txt: burn
	touch burn/ensure_read.txt

burn/readhfuse.hex: burn/ensure_read.txt
	$(AVRDUDE) -c $(PROGRAMMER_BOARD) -p $(MCU) -P $(PROGRAMMER_TTY) -b $(PROGRAMMER_BAUDRATE) -U hfuse:r:$@:i -F

burn/readlfuse.hex: burn/ensure_read.txt
	$(AVRDUDE) -c $(PROGRAMMER_BOARD) -p $(MCU) -P $(PROGRAMMER_TTY) -b $(PROGRAMMER_BAUDRATE) -U lfuse:r:$@:i -F

burn/readhfuse.bin: burn/readhfuse.hex
	avr-objcopy -I ihex -O binary $< $@

burn/readlfuse.bin: burn/readlfuse.hex
	avr-objcopy -I ihex -O binary $< $@

burn/readhfuse.txt: burn/readhfuse.bin
	xxd -ps $< > $@

burn/readlfuse.txt: burn/readlfuse.bin
	xxd -ps $< > $@

readfuses: burn/readhfuse.txt burn/readlfuse.txt
	cat burn/readhfuse.txt burn/readlfuse.txt
	rm burn/ensure_read.txt

clean:
	rm -rf build autoinclude burn

asm: build/main.S build/main.cc
#asm: build/main.cc