write.py

# Copyright (c) 2019 charlysan

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r"""Example script to write a tag with custom Customer ID and UID

Flow:
    - Try to read a tag within an infinite loop.
    - If a tag is found then try to write it using CID and UID.
    - Verify if the tag has been successfully written.
    - If the write operation succeeds then beep twice and output CID, UID and CRC value
    - If the write operation fails then beep three times and output error message.


Note: extra check has been added to avoid processing the same tag (CID/UID) more than once in a row.
"""

from __future__ import print_function
from time import sleep
from rfidhid.core import RfidHid

def main():
    """Main Write Tag Function"""

    # CID and UID to be written
    CID = 77
    UID = 1234567891

    try:
        # Try to open RFID device using default vid:pid (ffff:0035)
        rfid = RfidHid()
    except Exception as e:
        print(e)
        exit()

    # Initialize device
    print('Initializing device...')
    rfid.init()
    sleep(2)
    print('Done!')
    print('CID:UID to be written: %s:%s' % (CID, UID))
    print ('Please hold a tag to the reader until you hear two beeps...\n')


    uid_temp = None

    while True:
        payload_response = rfid.read_tag()
        if payload_response.has_id_data():
            uid = payload_response.get_tag_uid()
            # Avoid processing the same tag (CID/UID) more than once in a row
            if uid != uid_temp:
                uid_temp = uid

                rfid.write_tag_from_cid_and_uid(CID, UID)
                sleep(0.2) # you cannot immediately read after a write operation

                payload_response_w = rfid.read_tag()
                # Write verification
                if payload_response_w.get_tag_cid() == CID and payload_response_w.get_tag_uid() == UID:
                    print('Write OK!')
                    print('uid: %s' % payload_response_w.get_tag_uid())
                    print('customer_id: %s' % payload_response.get_tag_cid())
                    print('CRC Sum: %s' % hex(payload_response.get_crc_sum()))
                    rfid.beep(2)
                else:
                    print('Write ERROR!')
                    rfid.beep(3)
        else:
            uid_temp = None
        sleep(0.1)


if __name__ == "__main__": 
    main()