NFC with SD module error

Projects Programming
2

Both the SD library and the PN532 library want to use SPI. The PN532 uses the old way of configuring SPI without the beginTransaction() settings stuff. I reckon, the original settings that the PN532 configures are getting changed by the use of the SD library and so the PN532 stuff fails.

Try adding a nfc.begin() in the loop() before the read card line:

void loop(void) {
 uint32_t id;
  nfc.begin();
  // look for MiFare type cards
  id = nfc.readPassiveTargetID(PN532_MIFARE_ISO14443A);