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I'd like to know if it's possible to use the ICSP header pins on the Leonardo as GPIO pins, for example for software serial, and how to address them. I've a project which needs all available I/O pins, and I could use having serial comms on those "extra" pins.

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From packages/arduino/hardware/avr/1.6.*/variants/leonardo/pins_arduino.h:

// Map SPI port to 'new' pins D14..D17
#define PIN_SPI_SS    (17)
#define PIN_SPI_MOSI  (16)
#define PIN_SPI_MISO  (14)
#define PIN_SPI_SCK   (15)

static const uint8_t SS   = PIN_SPI_SS;
static const uint8_t MOSI = PIN_SPI_MOSI;
static const uint8_t MISO = PIN_SPI_MISO;
static const uint8_t SCK  = PIN_SPI_SCK;

Those are the pin names and numbers you can use. Note that SS/17 is connected to the RX LED.

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  • Thanks! I'll test it as soon as I have some time to spare! ;) Commented Nov 10, 2016 at 17:02
  • It works, though SoftwareSerial don't seem to be able to manage baud rates of 115200 bps, which I need.. :$ Commented Nov 10, 2016 at 20:48

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