# Example of detecting and reading a block from a MiFare classic NFC card.
# Author: Tony DiCola & Roberto Laricchia
# MiFare Classic modification: Francesco Crisafulli
#
# Copyright (c) 2015 Adafruit Industries
#
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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
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# furnished to do so, subject to the following conditions:
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"""
This example shows connecting to the PN532 and writing & reading a mifare classic
type RFID tag
"""

import board
import busio
from digitalio import DigitalInOut
#
# NOTE: pick the import that matches the interface being used
#
from adafruit_pn532.adafruit_pn532 import MIFARE_CMD_AUTH_B  
from adafruit_pn532.i2c import PN532_I2C
#from adafruit_pn532.spi import PN532_SPI
#from adafruit_pn532.uart import PN532_UART

# I2C connection:
i2c = busio.I2C(board.SCL, board.SDA)

# Non-hardware reset/request with I2C
pn532 = PN532_I2C(i2c, debug=False)

# With I2C, we recommend connecting RSTPD_N (reset) to a digital pin for manual
# harware reset
#reset_pin = DigitalInOut(board.D6)
# On Raspberry Pi, you must also connect a pin to P32 "H_Request" for hardware
# wakeup! this means we don't need to do the I2C clock-stretch thing
#req_pin = DigitalInOut(board.D12)
#pn532 = PN532_I2C(i2c, debug=False, reset=reset_pin, req=req_pin)

# SPI connection:
#spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
#cs_pin = DigitalInOut(board.D5)
#pn532 = PN532_SPI(spi, cs_pin, debug=False)

# UART connection
#uart = busio.UART(board.TX, board.RX, baudrate=115200, timeout=100)
#pn532 = PN532_UART(uart, debug=False)

ic, ver, rev, support = pn532.get_firmware_version()
print('Found PN532 with firmware version: {0}.{1}'.format(ver, rev))

# Configure PN532 to communicate with MiFare cards
pn532.SAM_configuration()

print('Waiting for RFID/NFC card to write to!')

key = b'\xFF\xFF\xFF\xFF\xFF\xFF'

while True:
    # Check if a card is available to read
    uid = pn532.read_passive_target(timeout=0.5)
    print('.', end="")
    # Try again if no card is available.
    if uid is not None:
        break

print("")

print('Found card with UID:', [hex(i) for i in uid])
print("Authenticating block 4 ...")

authenticated = pn532.mifare_classic_authenticate_block(uid,4,MIFARE_CMD_AUTH_B,key)
if not authenticated:
    print("Authentication failed!")

# Set 16 bytes of block to 0xFEEDBEEF
data = bytearray(16)
data[0:16] = b'\xFE\xED\xBE\xEF\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'

# Write 16 byte block.
pn532.mifare_classic_write_block(4, data)
# Read block #6
print('Wrote to block 4, now trying to read that data:',
      [hex(x) for x in pn532.mifare_classic_read_block(4)])