circuitpython/ports/atmel-samd/boards/metro_m0_express/mpconfigboard.h

#define MICROPY_HW_BOARD_NAME "Adafruit Metro M0 Express"
#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)

// Clock rates are off: Salae reads 12MHz which is the limit even though we set it to the safer 8MHz.
#define SPI_FLASH_BAUDRATE  (8000000)

#define SPI_FLASH_MOSI_PIN          PIN_PB22
#define SPI_FLASH_MISO_PIN          PIN_PB03
#define SPI_FLASH_SCK_PIN           PIN_PB23
#define SPI_FLASH_CS_PIN            PIN_PA13
#define SPI_FLASH_MOSI_PIN_FUNCTION PINMUX_PB22D_SERCOM5_PAD2
#define SPI_FLASH_MISO_PIN_FUNCTION PINMUX_PB03D_SERCOM5_PAD1
#define SPI_FLASH_SCK_PIN_FUNCTION  PINMUX_PB23D_SERCOM5_PAD3
#define SPI_FLASH_SERCOM            SERCOM5
#define SPI_FLASH_SERCOM_INDEX      5
#define SPI_FLASH_MOSI_PAD          2
#define SPI_FLASH_MISO_PAD          1
#define SPI_FLASH_SCK_PAD           3
// <o> Transmit Data Pinout
// <0x0=>PAD[0,1]_DO_SCK
// <0x1=>PAD[2,3]_DO_SCK
// <0x2=>PAD[3,1]_DO_SCK
// <0x3=>PAD[0,3]_DO_SCK
#define SPI_FLASH_DOPO              1
#define SPI_FLASH_DIPO              1   // same as MISO pad

// These are pins not to reset.
#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 MICROPY_PORT_C        (0)

#include "spi_flash.h"

// If you change this, then make sure to update the linker scripts as well to
// make sure you don't overwrite code.
// #define CIRCUITPY_INTERNAL_NVM_SIZE 256
#define CIRCUITPY_INTERNAL_NVM_SIZE 0

#define BOARD_FLASH_SIZE (0x00040000 - 0x2000 - CIRCUITPY_INTERNAL_NVM_SIZE)

#include "flash_S25FL216K.h"
#include "flash_GD25Q16C.h"