Hi,
Our product (Card Reader), after many years of working fine with DESFire / DESFire EV1 cards, is having a problem when trying to interface DESFire EV2 cards, using the same program code that works well for all other DESfire cards.
My communication with the PICC fails in the ISO14443-4 part when using Desfire EV2 cards, in this procedure:
- I send RATS command "0xE0" with parameter 0x50 which corresponds to "FSDI defining maximum frame of bytes the PCD can receive" = 64. Also selects the CID (card identifier) to be = 0.
- I receive 6 bytes response, assuming that it is OK.
Then I sent the 3 bytes of PPS request as follows:
0xD0 - the start byte,
0x11 - Parameter 0, indicates the presence of Parameter 1.
0x05 - Parameter 1, setting 212kbps for both DRI and DSI.
After this, I get zero response from the PICC where I should get the "0xD0" instead, and so afterward's no communication is available with the PICC so this is the fail part!
The same code works fine for all DESFire cards except Desfire EV2.
The used frontend chip is MFRC522.
What might be the problem? Why would EV2 fail way back in the ISO14443-4 part where other cards work fine?
Thanks in advance!
