I've got the I2C NFC Shield and am trying to get it up and running with the Arduino Nano (ATMega328). I am reasonably confident in my solder joints and have power in the NFC Shield. The busy light comes on and stays on the moment power arrives - is this supposed to happen?
Running the readmifare example I get
Didn't find PN53x board
I have 5V, GND, SDA, SCL and D2 connected to their counterparts on the Nano. Is the IRQ (#define IRQ (2)) the pin on the ATMega328 or is there some magic remapping the number there from D2 to pin 5? (I think it should be 5 as that's the pin D2 maps to on the Nano.)