circuitpython/ports/atmel-samd/boards/feather_m0_basic/mpconfigboard.h

// LEDs
#define MICROPY_HW_LED_STATUS   (&pin_PA17)

#define MICROPY_HW_BOARD_NAME "Adafruit Feather M0 Basic"
#define MICROPY_HW_MCU_NAME "samd21g18"

#define DEFAULT_I2C_BUS_SCL (&pin_PA23)
#define DEFAULT_I2C_BUS_SDA (&pin_PA22)

#define DEFAULT_SPI_BUS_SCK (&pin_PB11)
#define DEFAULT_SPI_BUS_MOSI (&pin_PB10)
#define DEFAULT_SPI_BUS_MISO (&pin_PA12)

#define DEFAULT_UART_BUS_RX (&pin_PA11)
#define DEFAULT_UART_BUS_TX (&pin_PA10)

// USB is always used internally so skip the pin objects for it.
#define IGNORE_PIN_PA24     1
#define IGNORE_PIN_PA25     1

// Connected to a crystal
#define IGNORE_PIN_PA00     1
#define IGNORE_PIN_PA01     1

// Unconnected
#define IGNORE_PIN_PB03     1
#define IGNORE_PIN_PB22     1
#define IGNORE_PIN_PB23     1
#define IGNORE_PIN_PA06     1
#define IGNORE_PIN_PA08     1
#define IGNORE_PIN_PA09     1
#define IGNORE_PIN_PA13     1
#define IGNORE_PIN_PA14     1
#define IGNORE_PIN_PA21     1
#define IGNORE_PIN_PA27     1
#define IGNORE_PIN_PA28     1

// SWD-only
#define IGNORE_PIN_PA30     1
#define IGNORE_PIN_PA31     1