stm32/boards/NUCLEO_L152RE: Add NUCLEO-L152RE board support.

This change adds NUCLEO-L152RE support to the STM32 port.
NUCLEO-L152RE: https://www.st.com/en/evaluation-tools/nucleo-l152re.html
This board use STM32L152RE:
https://www.st.com/en/microcontrollers-microprocessors/stm32l152re.html

ports/stm32/boards/NUCLEO_L152RE/board.json

@@ -0,0 +1,15 @@
+{
+    "deploy": [
+        "./deploy.md"
+    ],
+    "docs": "",
+    "features": [],
+    "images": [
+        "nucleo_l152re.jpg"
+    ],
+    "mcu": "stm32l1",
+    "product": "Nucleo L152RE",
+    "thumbnail": "",
+    "url": "",
+    "vendor": "ST Microelectronics"
+}

ports/stm32/boards/NUCLEO_L152RE/deploy.md

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+### STM32 via ST-Link
+
+Nucleo and Discovery boards typically include a built-in ST-Link programmer.
+
+A `.bin` or `.hex` file can be flashed using [st-flash](https://github.com/stlink-org/stlink).
+
+```bash
+# Optional erase to clear existing filesystem.
+st-flash erase
+
+# Flash .bin
+st-flash write firmware.bin 0x08000000
+# or, flash .hex
+st-flash --format ihex write firmware.hex
+```
+
+A `.hex` file can be flashed using [STM32 Cube Programmer](https://www.st.com/en/development-tools/stm32cubeprog.html).
+
+```bash
+STM32_Programmer.sh -c port=SWD mode=UR dLPM -d firmware.hex -v -hardRst
+```
+
+### STM32 via DFU
+
+Boards with USB support can also be programmed via the ST DFU bootloader, using e.g. [dfu-util](http://dfu-util.sourceforge.net/) or [pydfu.py](https://github.com/micropython/micropython/blob/master/tools/pydfu.py).
+
+To enter the bootloader the `BOOT0` pin can be connected to `VCC` during reset, or you can use `machine.bootloader()` from the MicroPython REPL.
+
+```bash
+dfu-util --alt 0 -D firmware.dfu
+```

ports/stm32/boards/NUCLEO_L152RE/mpconfigboard.h

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+#define MICROPY_HW_BOARD_NAME       "NUCLEO-L152RE"
+#define MICROPY_HW_MCU_NAME         "STM32L152xE"
+
+#define MICROPY_HW_HAS_SWITCH       (1)
+#define MICROPY_HW_ENABLE_RTC       (1)
+// This board has an external 32kHz crystal
+#define MICROPY_HW_RTC_USE_LSE      (1)
+#define MICROPY_HW_ENABLE_SERVO     (1)
+#define MICROPY_HW_ENABLE_DAC       (1)
+
+// HSE is 8MHz, HSI is 16MHz CPU freq set to 32MHz
+// Default source for the clock is HSI.
+// For revisions of the board greater than C-01, HSE can be used as a
+// clock source by removing the #define MICROPY_HW_CLK_USE_HSE line
+#define MICROPY_HW_CLK_USE_HSI (1)
+
+#if MICROPY_HW_CLK_USE_HSI
+#define MICROPY_HW_CLK_PLLMUL (RCC_CFGR_PLLMUL6)
+#define MICROPY_HW_CLK_PLLDIV (RCC_CFGR_PLLDIV3)
+#else
+#define MICROPY_HW_CLK_PLLMUL (RCC_CFGR_PLLMUL12)
+#define MICROPY_HW_CLK_PLLDIV (RCC_CFGR_PLLDIV3)
+#endif
+
+// UART config
+#define MICROPY_HW_UART1_TX     (pin_A9)
+#define MICROPY_HW_UART1_RX     (pin_A10)
+#define MICROPY_HW_UART2_TX     (pin_A2)
+#define MICROPY_HW_UART2_RX     (pin_A3)
+#define MICROPY_HW_UART3_TX     (pin_B10)
+#define MICROPY_HW_UART3_RX     (pin_B11)
+#define MICROPY_HW_UART4_TX     (pin_C10)
+#define MICROPY_HW_UART4_RX     (pin_C11)
+#define MICROPY_HW_UART5_TX     (pin_C12)
+#define MICROPY_HW_UART5_RX     (pin_D2)
+// UART 2 connects to the STM32F103 (STLINK) on the Nucleo board
+// and this is exposed as a USB Serial port.
+#define MICROPY_HW_UART_REPL        PYB_UART_2
+#define MICROPY_HW_UART_REPL_BAUD   115200
+
+// I2C buses
+#define MICROPY_HW_I2C1_SCL (pin_B8)        // Arduino D15, pin 3 on CN10
+#define MICROPY_HW_I2C1_SDA (pin_B9)        //         D14, pin 5 on CN10
+#define MICROPY_HW_I2C2_SCL (pin_B10)       // Arduino D6,  pin 25 on CN10
+#define MICROPY_HW_I2C2_SDA (pin_B11)       // Arduino D3,  pin 31 on CN10
+
+// SPI buses
+#define MICROPY_HW_SPI1_NSS     (pin_A15)   //              pin 17 on CN7
+#define MICROPY_HW_SPI1_SCK     (pin_A5)    // Arduino D13, pin 11 on CN10
+#define MICROPY_HW_SPI1_MISO    (pin_A6)    // Arduino D12, pin 13 on CN10
+#define MICROPY_HW_SPI1_MOSI    (pin_A7)    // Arduino D11, pin 15 on CN10
+
+#define MICROPY_HW_SPI2_NSS     (pin_B12)   //              pin 16 on CN10
+#define MICROPY_HW_SPI2_SCK     (pin_B13)   //              pin 30 on CN10
+#define MICROPY_HW_SPI2_MISO    (pin_B14)   //              pin 28 on CN10
+#define MICROPY_HW_SPI2_MOSI    (pin_B15)   //              pin 26 on CN10
+
+#define MICROPY_HW_SPI3_NSS     (pin_A4)    // Arduino A2,  pin 32 on CN7
+#define MICROPY_HW_SPI3_SCK     (pin_C10)   // Arduino D3,  pin 31 on CN10
+#define MICROPY_HW_SPI3_MISO    (pin_C11)   // Arduino D5,  pin 27 on CN10
+#define MICROPY_HW_SPI3_MOSI    (pin_C12)   // Arduino D4,  pin 29 on CN10
+
+// 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_ON(pin)      (mp_hal_pin_high(pin))
+#define MICROPY_HW_LED_OFF(pin)     (mp_hal_pin_low(pin))
+
+#define MICROPY_HW_FLASH_LATENCY FLASH_LATENCY_1

ports/stm32/boards/NUCLEO_L152RE/mpconfigboard.mk

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+MCU_SERIES = l1
+CMSIS_MCU = STM32L152xE
+AF_FILE = boards/stm32l152_af.csv
+LD_FILES = boards/stm32l152xe.ld boards/common_basic.ld

ports/stm32/boards/NUCLEO_L152RE/pins.csv

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+D0,PA3
+D1,PA2
+D2,PA10
+D3,PB3
+D4,PB5
+D5,PB4
+D6,PB10
+D7,PA8
+D8,PA9
+D9,PC7
+D10,PB6
+D11,PA7
+D12,PA6
+D13,PA5
+D14,PB9
+D15,PB8
+A0,PA0
+A1,PA1
+A2,PA4
+A3,PB0
+A4,PC1
+A5,PC0
+PA0,PA0
+PA1,PA1
+PA2,PA2
+PA3,PA3
+PA4,PA4
+PA5,PA5
+PA6,PA6
+PA7,PA7
+PA8,PA8
+PA9,PA9
+PA10,PA10
+PA11,PA11
+PA12,PA12
+PA15,PA15
+PB0,PB0
+PB1,PB1
+PB2,PB2
+PB3,PB3
+PB4,PB4
+PB5,PB5
+PB6,PB6
+PB7,PB7
+PB8,PB8
+PB9,PB9
+PB10,PB10
+PB11,PB11
+PB12,PB12
+PB13,PB13
+PB14,PB14
+PB15,PB15
+PC0,PC0
+PC1,PC1
+PC2,PC2
+PC3,PC3
+PC4,PC4
+PC5,PC5
+PC6,PC6
+PC7,PC7
+PC8,PC8
+PC9,PC9
+PC10,PC10
+PC11,PC11
+PC12,PC12
+PC13,PC13
+PC14,PC14
+PC15,PC15
+PD2,PD2
+PH0,PH0
+PH1,PH1
+LED_GREEN,PA5
+LED_ORANGE,PA5
+LED_RED,PA5
+LED_BLUE,PA4
+SW,PC13

ports/stm32/boards/NUCLEO_L152RE/stm32l1xx_hal_conf.h

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+/* This file is part of the MicroPython project, http://micropython.org/
+ * The MIT License (MIT)
+ * Copyright (c) 2019 Damien P. George
+ */
+#ifndef MICROPY_INCLUDED_STM32L1XX_HAL_CONF_H
+#define MICROPY_INCLUDED_STM32L1XX_HAL_CONF_H
+
+#include "boards/stm32l1xx_hal_conf_base.h"
+
+#endif // MICROPY_INCLUDED_STM32L1XX_HAL_CONF_H