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
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.
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,