from machine import Pin, SPI
from mfrc522 import MFRC522
import time

# SPI configuration for Raspberry Pi Pico
# SCK=18, MOSI=19, MISO=16
spi = SPI(0, 
          baudrate=100000, 
          polarity=0, 
          phase=0,
          sck=Pin(2), 
          mosi=Pin(3), 
          miso=Pin(4))

# RST and CS (SDA) pins
RST_PIN = 0
CS_PIN  = 5

print("---------------------------------------")
print("Initialize the reader")
print("---------------------------------------")
rfid = MFRC522(spi, RST_PIN, CS_PIN, 2)

print("---------------------------------------")
print("System ready! Bring a tag close...")
print("---------------------------------------")

while True:
    # 1. Look for a card
    (stat, tag_type) = rfid.request(rfid.PICC_REQIDL)

    if stat == rfid.OK:
        # If a card is present, attempt to read its UID
        (stat, uid) = rfid.anticoll()
        
        if stat == rfid.OK:
            # Convert the byte list to a Hexadecimal string
            #uid_hex = "{:02X}{:02X}{:02X}{:02X}".format(uid[0], uid[1], uid[2], uid[3])
            # uid is a list of bytes: [12, 45, 120, 10]
            # Convert it to a clean hex string
            print("---------------------------------------")
            uid_hex = ":".join(["{:02X}".format(x) for x in uid])
            print("Card detected!")
            print("Unique ID (HEX) :", uid_hex)
            print("Unique ID (DEC) :", uid)
            print("---------------------------------------")
            
            # Pause to avoid reading the same card multiple times
            time.sleep(1.5)
        else:
            # If detected but UID cannot be read
            print("---------------------------------------")
            print("UID read error (Anticollision), anticollstat:", stat)
            print("---------------------------------------")
    else:
        # If detected but UID cannot be read
        print("---------------------------------------")
        print("No Card detected")
        print("---------------------------------------")

    time.sleep(5)