stmhal: Add support for the STM32F401NUCLEO board.

Includes full version of pins.csv file with correct mapping of the Nucleo
STM32F401RE chip (LQFP64 package).

stmhal/boards/STM32F401NUCLEO/mpconfigboard.h

@@ -0,0 +1,37 @@
+#define MICROPY_HW_BOARD_NAME       "F401NUCLEO"
+#define MICROPY_HW_MCU_NAME         "STM32F401xE"
+
+#define MICROPY_HW_HAS_SWITCH       (1)
+#define MICROPY_HW_ENABLE_RTC       (1)
+
+// HSE is 8MHz, CPU freq set to 84MHz
+#define MICROPY_HW_CLK_PLLM (8)
+#define MICROPY_HW_CLK_PLLN (336)
+#define MICROPY_HW_CLK_PLLP (RCC_PLLP_DIV4)
+#define MICROPY_HW_CLK_PLLQ (7)
+
+// UART config
+#define MICROPY_HW_UART2_PORT (GPIOA)
+#define MICROPY_HW_UART2_PINS (GPIO_PIN_2 | GPIO_PIN_3)
+#define MICROPY_HW_UART6_PORT (GPIOC)
+#define MICROPY_HW_UART6_PINS (GPIO_PIN_6 | GPIO_PIN_7)
+
+// I2C busses
+#define MICROPY_HW_I2C1_SCL (pin_B6)
+#define MICROPY_HW_I2C1_SDA (pin_B7)
+
+// 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 LD2 LED on Nucleo
+#define MICROPY_HW_LED_OTYPE        (GPIO_MODE_OUTPUT_PP)
+#define MICROPY_HW_LED_ON(pin)      (pin->gpio->BSRRL = pin->pin_mask)
+#define MICROPY_HW_LED_OFF(pin)     (pin->gpio->BSRRH = pin->pin_mask)
+
+// USB config
+#define MICROPY_HW_USB_VBUS_DETECT_PIN (pin_A9)
+#define MICROPY_HW_USB_OTG_ID_PIN      (pin_A10)

stmhal/boards/STM32F401NUCLEO/mpconfigboard.mk

@@ -0,0 +1,4 @@
+MCU_SERIES = f4
+CMSIS_MCU = STM32F401xE
+AF_FILE = boards/stm32f401_af.csv
+LD_FILE = boards/stm32f401.ld

stmhal/boards/STM32F401NUCLEO/pins.csv

@@ -0,0 +1,52 @@
+PC0,PC0
+PC1,PC1
+PC2,PC2
+PC3,PC3
+PA0,PA0
+PA1,PA1
+PA2,PA2
+PA3,PA3
+PA4,PA4
+PA5,PA5
+PA6,PA6
+PA7,PA7
+PC4,PC4
+PC5,PC5
+PB0,PB0
+PB1,PB1
+PB2,PB2
+PB10,PB10
+PB12,PB12
+PB13,PB13
+PB14,PB14
+PB15,PB15
+PC6,PC6
+PC7,PC7
+PC8,PC8
+PC9,PC9
+PA8,PA8
+PA9,PA9
+PA10,PA10
+PA13,PA13
+PA14,PA14
+PA15,PA15
+PC10,PC10
+PC11,PC11
+PC12,PC12
+PD2,PD2
+PB4,PB4
+PB5,PB5
+PB6,PB6
+PB7,PB7
+PB8,PB8
+PB9,PB9
+PC13,PC13
+PC14,PC14
+PC15,PC15
+PH0,PH0
+PH1,PH1
+LED_GREEN,PA5
+LED_ORANGE,PA5
+LED_RED,PA5
+LED_BLUE,PA4
+SW,PC13