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TRF7962A: How to modify the crc-POLYNOMIAL in TRF7962A software?

yingying liao
Prodigy 70 points
Part Number: TRF7962A

Hello:

I have a trouble,

My RFID-TAG used a different CRC-POLYNOMIAL, such as 0x1122. But how to modify the code in TRF7962A, and readout tag correctly？

thanks

  • 0
    Prodigy 70 points
    My RFID-TAG used a different CRC-INIT, not 0xFFFF, but 0x1122. But how to modify the code in TRF7962A, and readout tag correctly？



    thanks
  • 0 in reply to yingying liao
    TI__Guru* 90906 points
    which ISO15693 card is that? (curious - been doing RFID for a while, never came across this particular one)
    if it uses a different CRC for both the downlink and the uplink, you will have to set the ISO Control register bit 7 to a 1 (to handle the reception), and then send your string out with a 0x90 (instead of a 0x91), i.e. 0x8F, 0x90, 0x3D, number of bytes going out, command, and your CRC. (whatever the tag expects)
    then on the RX in, you will get the tag response with the CRC in there, so you can handle checking it.