# AVR-GCC compiler
CC = avr-gcc

# Programmer (change it according to your programmer)
PROGRAMMER = usbasp

# MCU
MCU = atmega328p
QEMU_MACHINE_NAME = uno

# Compiler flags
CFLAGS = -std=c99 -Wall -Wno-array-bounds -mmcu=$(MCU) -DF_CPU=16000000UL -Os -g -ffunction-sections -fdata-sections

# Source files
SRCS = main.c

# Object files
OBJS = $(SRCS:.c=.o)

# Target file
TARGET = main

# Default target
all: $(TARGET).hex

# Compile C files
%.o: %.c
	$(CC) $(CFLAGS) -c $< -o $@

# Link object files
$(TARGET).elf: $(OBJS)
	$(CC) $(CFLAGS) $(OBJS) -o $(TARGET).elf -Wl,--gc-sections

# Convert ELF to HEX
$(TARGET).hex: $(TARGET).elf
	avr-objcopy -O ihex -R .eeprom $(TARGET).elf $(TARGET).hex

# Flash the program
flash: $(TARGET).hex
	avrdude -p $(MCU) -c $(PROGRAMMER) -U flash:w:$(TARGET).hex

# Run the program in QEMU
qemu: $(TARGET).elf
	qemu-system-avr -machine $(QEMU_MACHINE_NAME) -bios $(TARGET).elf

.PHONY: serial
serial:
	picocom -b 9600 /dev/ttyUSB0

# Check so that we can talk to the MCU
.PHONY: check
check:
	avrdude -p $(MCU) -c $(PROGRAMMER)

# Generate symbol table and assembly
extra: $(TARGET).elf
	avr-objdump -t $(TARGET).elf > $(TARGET).map
	avr-objdump -S $(TARGET).elf > $(TARGET).asm

# Clean
.PHONY: clean
clean:
	rm -f $(OBJS) $(TARGET).elf $(TARGET).hex $(TARGET).map $(TARGET).asm

size: main.hex
	avr-size --mcu=$(MCU) main.hex