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.
// 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.