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TRF7960 Demo with Stellaris

JasonHaedt
Genius 3320 points
Other Parts Discussed in Thread: TRF7960

Dear TI Team,

I was playing around with the TRF7960 demo and was writing different blocks on the cards to verify the functionality of the TRF7960.  However, after writing one of the cards it is no longer functional.  Is there specific data that must be on the card?  Is there anyway to reprogram a card that will no longer identify with evaluation?

Sincerely,

Jason

  • 0
    TI__Guru* 91206 points

    Jason -

    I am not sure what you did here as i don't think it should be possible to disable the tags using what is available in the touchscreen "GUI" provided by the kit. The only thing i can think of here is that somehow you changed the default keys (should not be possible from that screen, though) as this is what is being used for the authentication step(s). Have you tried using the Format button or Erase button after selecting the block? or can you not even get that far?

    Also, i did not quite understand your question about not wanting to id a card with an evaluation? what exactly are you looking for here? the cards are not specially programmed, they are just new cards with default Mifare keys in them...

    Thanks!

  • 0 in reply to Josh Wyatt
    Genius 3320 points

    Josh,

    I was not using the gui, but was using the command line to read and write blocks.  However after writing several blocks to nonzero values my card no longer identifies when I place it on the TRF7960 evaluation board. When it does not identify, it doesn't even read a serial number on the card itself.  So my thought was that I must have overwritten something important in one of the blocks.  Is that possible?

    The main reason I ask is I am hesitant to write data to the other card because I don't want ruin that card either.  There are only two cards that come with the kit.  Any thoughts?

    Sincerely,

    Jason

  • 0 in reply to JasonHaedt
    TI__Guru* 91206 points

    Exactly - you must have over written the default keys. so then now the cards cannot be authenticated with the Stellaris kit firmware since it is using those. Please see attached DS on the card so you can possibly get them back to where they were or if you know what you wrote into the card, then you could modify that demo FW to match the keys you wrote.

    3005.M001053_MF1ICS50_rev5_3.pdf