RFID_RT_HMI.py

#!/usr/bin/env python3
# Code tested and is working as of 21/01/2022 for BP
# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""
This example shows connecting to the PN532 with I2C (requires clock
stretching support), SPI, or UART. SPI is best, it uses the most pins but
is the most reliable and universally supported.
After initialization, try waving various 13.56MHz RFID cards over it!
"""

from pickle import FALSE
import board
import busio
from digitalio import DigitalInOut
import binascii
from multiprocessing import Process    # for parallel processing

#
# NOTE: pick the import that matches the interface being used
#
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
# 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)


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

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

# Read and store the db in RAM
byte_arr1 = []
with open("rfidBinDatabase", "rb") as f:
    print('Opening the file!')
    byte = f.read(1)
    while byte:
        # Do stuff with byte.
        byte = f.read(1)
        byte_arr1.extend(bytes(byte))

byte_arr = byte_arr1
print('Byte arr of db is:',byte_arr)

def ScanCard():
    print("Waiting for RFID/NFC card...")
    prevUID = bytearray(b'3\x00\x00\x00')
    while True:
        # Check if a card is available to read
        uid = pn532.read_passive_target(timeout=3)
        print(".", end="")
        # Try again if no card is available.
        if uid is None:
            continue
        # print("Detected card with UID:", uid)
        # print("Same ID?",prevUID, uid)
        if prevUID == uid:
            # print("Same ID",prevUID, uid)
            continue
        # Log the card that is detected
        prevUID = uid
        file = open("rfidLog.txt", "ab")
        # Write bytes to file
        immutable_bytes = bytes(uid)
        file.write(immutable_bytes)
        file.close()
                # if (i+1) % 3:
                    # print(byte_arr)
                    # byte_arr.clear()
        print("Detected card with UID:", uid)
        print(set(immutable_bytes).issubset(byte_arr))

def HMIDisplay():
    print("HMI Display STARTED\n")
    while True:
        print("Some info\n")
        for i in range(10000000):
            for i in range(10000000):
                pass


if __name__ == '__main__':
  p1 = Process(target=ScanCard)
  p1.start()
  p2 = Process(target=HMIDisplay)
  p2.start()
  p1.join()
  p2.join()