Mulitiple SPI devices. (NFC Shield v2, and SD shield V2)

Projects Networking, Protocols, and Devices
4

You should disable all other SPI devices before starting any of them. The code below disables the SD card SPI before starting the NDEF reader so the SD card won't corrupt the SPI bus during the startup.

void setup(void) {
  Serial.begin(9600);

  // disable SD before starting NFC
  pinMode(7, OUTPUT);
  digitalWrite(7, HIGH);

  Serial.println("NDEF Reader");
  nfc.begin();