the bug of PN532

[hhh123]

hello,

       Recently, I fond that PN532 can't find some M1 card.the problem card of  UID 'length  is  4 bytes,and the first byte is 0x88 when I use pn512 device test . Just  to be  equal to the CT, but the UID is 4 bytes can  compute the ATQA  to reach. But the pn532 return no cards. I guess  that PN532 deal the first byte 0x88 as equal to CT,then consider the UID  more than  4 bytes,  then  return  no card.

    can you test this situation?  And sove it

[IvanRuiz]

Hello,

Please refer to the following document for Mifare and handling of UIDs:

http://www.nxp.com/docs/en/application-note/AN10927.pdf 

NOTE:

Consider that the CT (0x88) indicates that the UID is not yet complete, and another Cascade Level has to follow.

Regards,

Ivan.

[hhh123]

Hello,

    Thanks for your response .The douctment says Note:the UID0 byte of a 4 byte UID must not be 0x88.

But the UID of problem card is only 4 bytes and UID0 just is 0x88 ,means that the card is not standard.

                                                                                                                                                       Best Regards,