circuitpython/ports/stm32/boards/NUCLEO_L476RG/mpconfigboard.h

#define MICROPY_HW_BOARD_NAME       "NUCLEO-L476RG"
#define MICROPY_HW_MCU_NAME         "STM32L476RG"

#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_USB       (1)
#define MICROPY_HW_ENABLE_DAC       (1)

// 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_PLLQ (RCC_PLLQ_DIV2)
#define MICROPY_HW_CLK_PLLR (RCC_PLLR_DIV2)

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

// UART config
#define MICROPY_HW_UART2_TX     (pin_A2)
#define MICROPY_HW_UART2_RX     (pin_A3)

#define MICROPY_HW_UART_REPL        PYB_UART_2
#define MICROPY_HW_UART_REPL_BAUD   115200

#define MICROPY_HW_FLASH_LATENCY    FLASH_LATENCY_4

// I2C busses
#define MICROPY_HW_I2C1_SCL (pin_B8)
#define MICROPY_HW_I2C1_SDA (pin_B9)
#define MICROPY_HW_I2C2_SCL (pin_B10)
#define MICROPY_HW_I2C2_SDA (pin_B11)
#define MICROPY_HW_I2C3_SCL (pin_C0)
#define MICROPY_HW_I2C3_SDA (pin_C1)

// SPI busses
#define MICROPY_HW_SPI1_NSS     (pin_A4)
#define MICROPY_HW_SPI1_SCK     (pin_B3)
#define MICROPY_HW_SPI1_MISO    (pin_B4)
#define MICROPY_HW_SPI1_MOSI    (pin_B5)
#define MICROPY_HW_SPI2_NSS     (pin_B12)
#define MICROPY_HW_SPI2_SCK     (pin_B13)
#define MICROPY_HW_SPI2_MISO    (pin_B14)
#define MICROPY_HW_SPI2_MOSI    (pin_B15)

// CAN bus
#define MICROPY_HW_CAN1_TX (pin_A12)
#define MICROPY_HW_CAN1_RX (pin_A11)

// USRSW is pulled low. Pressing the button makes the input go high.
#define MICROPY_HW_USRSW_PIN        (pin_C13)
#define MICROPY_HW_USRSW_PULL       (GPIO_NOPULL)
#define MICROPY_HW_USRSW_EXTI_MODE  (GPIO_MODE_IT_FALLING)
#define MICROPY_HW_USRSW_PRESSED    (0)

// LEDs
#define MICROPY_HW_LED1             (pin_A5) // Green LED on Nucleo
#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)