circuitpython/ports/stm32/boards/STM32L476DISC/mpconfigboard.h

#define MICROPY_BOARD_EARLY_INIT    STM32L476DISC_board_early_init
void STM32L476DISC_board_early_init(void);

#define MICROPY_HW_BOARD_NAME       "L476-DISCO"
#define MICROPY_HW_MCU_NAME         "STM32L476"

#define MICROPY_HW_ENABLE_INTERNAL_FLASH_STORAGE (0)
#define MICROPY_HW_HAS_SWITCH       (1)
#define MICROPY_HW_HAS_FLASH        (1)
#define MICROPY_HW_ENABLE_RNG       (1)
#define MICROPY_HW_ENABLE_RTC       (1)
#define MICROPY_HW_ENABLE_SERVO     (1)
#define MICROPY_HW_ENABLE_USB       (1)

// use external SPI flash for storage
#define MICROPY_HW_SPIFLASH_SIZE_BITS (128 * 1024 * 1024)
#define MICROPY_HW_SPIFLASH_CS      (pin_E11)
#define MICROPY_HW_SPIFLASH_SCK     (pin_E10)
#define MICROPY_HW_SPIFLASH_MOSI    (pin_E12)
#define MICROPY_HW_SPIFLASH_MISO    (pin_E13)

// block device config for SPI flash
extern const struct _mp_spiflash_config_t spiflash_config;
extern struct _spi_bdev_t spi_bdev;
#define MICROPY_HW_SPIFLASH_ENABLE_CACHE (1)
#define MICROPY_HW_BDEV_IOCTL(op, arg) ( \
    (op) == BDEV_IOCTL_NUM_BLOCKS ? (MICROPY_HW_SPIFLASH_SIZE_BITS / 8 / FLASH_BLOCK_SIZE) : \
    (op) == BDEV_IOCTL_INIT ? spi_bdev_ioctl(&spi_bdev, (op), (uint32_t)&spiflash_config) : \
    spi_bdev_ioctl(&spi_bdev, (op), (arg)) \
    )
#define MICROPY_HW_BDEV_READBLOCKS(dest, bl, n) spi_bdev_readblocks(&spi_bdev, (dest), (bl), (n))
#define MICROPY_HW_BDEV_WRITEBLOCKS(src, bl, n) spi_bdev_writeblocks(&spi_bdev, (src), (bl), (n))

// MSI is used and is 4MHz
#define MICROPY_HW_CLK_PLLM (1)
#define MICROPY_HW_CLK_PLLN (40)
#define MICROPY_HW_CLK_PLLP (RCC_PLLP_DIV7)
#define MICROPY_HW_CLK_PLLR (RCC_PLLR_DIV2)
#define MICROPY_HW_CLK_PLLQ (RCC_PLLQ_DIV2)

// The board has an external 32kHz crystal
#define MICROPY_HW_RTC_USE_LSE      (1)

#define MICROPY_HW_FLASH_LATENCY    FLASH_LATENCY_4

// USART config
#define MICROPY_HW_UART2_TX     (pin_D5)
#define MICROPY_HW_UART2_RX     (pin_D6)
// USART 2 is connected to the virtual com port on the ST-LINK
#define MICROPY_HW_UART_REPL        PYB_UART_2
#define MICROPY_HW_UART_REPL_BAUD   115200

// I2C buses
#define MICROPY_HW_I2C1_SCL (pin_B6)
#define MICROPY_HW_I2C1_SDA (pin_B7)
#define MICROPY_HW_I2C2_SCL (pin_B10)
#define MICROPY_HW_I2C2_SDA (pin_B11)

// SPI buses
#define MICROPY_HW_SPI2_NSS     (pin_D0)
#define MICROPY_HW_SPI2_SCK     (pin_D1)
#define MICROPY_HW_SPI2_MISO    (pin_D3)
#define MICROPY_HW_SPI2_MOSI    (pin_D4)

// CAN buses
#define MICROPY_HW_CAN1_TX (pin_B9)
#define MICROPY_HW_CAN1_RX (pin_B8)

// Joystick is pulled low. Pressing the button makes the input go high.
#define MICROPY_HW_USRSW_PIN        (pin_A0)
#define MICROPY_HW_USRSW_PULL       (GPIO_NOPULL)
#define MICROPY_HW_USRSW_EXTI_MODE  (GPIO_MODE_IT_RISING)
#define MICROPY_HW_USRSW_PRESSED    (1)

// LEDs
#define MICROPY_HW_LED1             (pin_B2) // red
#define MICROPY_HW_LED2             (pin_E8) // green
#define MICROPY_HW_LED_ON(pin)      (mp_hal_pin_high(pin))
#define MICROPY_HW_LED_OFF(pin)     (mp_hal_pin_low(pin))

// USB config
#define MICROPY_HW_USB_FS (1)
// #define MICROPY_HW_USB_OTG_ID_PIN      (pin_C12) // This is not the official ID Pin which should be PA10