read the sector of a 7byte 4k card using pn532

[Pradeep_C]

when I try to read the sector of a 7byte 4k card using pn532 it's giving error.but 4byte 4k card working fine . i am using raspberry Pi. anyone can help me

[mikeysklar]

Are you using libnfc? There uidLength seems like the thing to change, but another user post suggested the got a 7 byte tag going another way.

Code: Select all

   uint8_t uidLength;                        // Length of the UID (4 or 7 bytes depending on ISO14443A card type)
  
  // Wait for an ISO14443A type cards (Mifare, etc.).  When one is found
  // 'uid' will be populated with the UID, and uidLength will indicate
  // if the uid is 4 bytes (Mifare Classic) or 7 bytes (Mifare Ultralight)
  success = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A, &uid[0], &uidLength)

[Pradeep_C]

Thank you for the reply .it has been resolved .

[mikeysklar]

What was your resolution?