I convert an Uno RC522 NFC project to Leonardo Ethernet Shield.
I set Slave Select to SDA (2) and SCL to (3), I can’t detect the NFC reader.
While Uno can detect it with SS(7), I get failure warning on Leonardo.
Firmware Version: 0xFF = (unknown) WARNING: Communication failure, is the MFRC522 properly connected? Setup ready
Witch is the right pin for SS and SCL? MSIO is (12) and MOSI is (11) now.