# ===== EEPROM Simulation (File-based) =====

EEPROM_FILE = "eeprom.dat"
EEPROM_SIZE = 256  # bytes

def eeprom_init():
    try:
        with open(EEPROM_FILE, "rb"):
            print("EEPROM exists")
    except:
        print("Creating EEPROM...")
        with open(EEPROM_FILE, "wb") as f:
            f.write(bytearray(EEPROM_SIZE))


def eeprom_write(addr, value):
    if not (0 <= addr < EEPROM_SIZE):
        raise ValueError("Address out of range")

    if not (0 <= value <= 255):
        raise ValueError("Value must be 0–255")

    with open(EEPROM_FILE, "r+b") as f:
        f.seek(addr)
        f.write(bytes([value]))


def eeprom_read(addr):
    if not (0 <= addr < EEPROM_SIZE):
        raise ValueError("Address out of range")

    with open(EEPROM_FILE, "rb") as f:
        f.seek(addr)
        data = f.read(1)
        if not data:
            return 0
        return data[0]


# ===== Test Logic =====

import time

eeprom_init()

addr = 10
write_value = 123

print("Writing", write_value, "at address", addr)
eeprom_write(addr, write_value)

time.sleep(1)

read_value = eeprom_read(addr)
print("Read from EEPROM:", read_value)


# ===== Boot Counter Demo =====

count = eeprom_read(0)

if count >= 255:   # overflow protect
    count = 0

count += 1
eeprom_write(0, count)

print("Boot counter:", count)