For what it's worth, I got my Adafruit NFC Shield working in SPI mode by soldering jumpers from the internal header with MOSI, MISO, SCK and SS to pins 11, 12, 13 and 10 respectively. Since the library has implemented a Soft SPI, you can use any pins.. however I'd prefer to hook them up to the same pins that are hooked to the hardware SPI, for when I use this with my Spark Core ;-)
Code: Select all
#define SCK 13
#define MISO 12
#define MOSI 11
#define SS 10