circuitpython/atmel-samd/boards/metro_m0_flash/mpconfigboard.h

#define USB_REPL

#define MICROPY_HW_BOARD_NAME "Adafruit Metro M0 with Flash (Experimental)"
#define MICROPY_HW_MCU_NAME "samd21g18"

#define MICROPY_HW_LED_TX   PIN_PA27
#define MICROPY_HW_LED_RX   PIN_PA31

#define MICROPY_HW_NEOPIXEL (&pin_PA30)

#define SPI_FLASH_BAUDRATE  (1000000)

// Rev E
// #define SPI_FLASH_MUX_SETTING SPI_SIGNAL_MUX_SETTING_E
// #define SPI_FLASH_PAD0_PINMUX PINMUX_PA12D_SERCOM4_PAD0 // MISO
// // Use default pinmux for the chip select since we manage it ourselves.
// #define SPI_FLASH_PAD1_PINMUX PINMUX_DEFAULT // CS
// #define SPI_FLASH_PAD2_PINMUX PINMUX_PB10D_SERCOM4_PAD2 // MOSI
// #define SPI_FLASH_PAD3_PINMUX PINMUX_PB11D_SERCOM4_PAD3 // SCK
// #define SPI_FLASH_CS          PIN_PA13
// #define SPI_FLASH_SERCOM      SERCOM4
//
// #define MICROPY_PORT_A        (PORT_PA12 | PORT_PA13 |PORT_PA24 | PORT_PA25 | PORT_PA27 | PORT_PA30)
// #define MICROPY_PORT_B        (PORT_PB03 | PORT_PB10 | PORT_PB11)

// Rev F
#define SPI_FLASH_MUX_SETTING SPI_SIGNAL_MUX_SETTING_F
#define SPI_FLASH_PAD0_PINMUX PINMUX_DEFAULT // CS
// Use default pinmux for the chip select since we manage it ourselves.
#define SPI_FLASH_PAD1_PINMUX PINMUX_PB03D_SERCOM5_PAD1 // MISO
#define SPI_FLASH_PAD2_PINMUX PINMUX_PB22D_SERCOM5_PAD2 // MOSI
#define SPI_FLASH_PAD3_PINMUX PINMUX_PB23D_SERCOM5_PAD3 // SCK
#define SPI_FLASH_CS          PIN_PA13
#define SPI_FLASH_SERCOM      SERCOM5

#define MICROPY_PORT_A        (PORT_PA13 |PORT_PA24 | PORT_PA25 | PORT_PA27 | PORT_PA30 | PORT_PA31)
#define MICROPY_PORT_B        (PORT_PB03 | PORT_PB22 | PORT_PB23)

#define AUTORESET_DELAY_MS 500

#include "spi_flash.h"

#define BOARD_FLASH_SIZE (0x00040000 - 0x2000)