text: /**
    ******************************************************************************
    * @file    Projects/Multi/Examples/IKS01A1/LSM6DS3_FIFOContinuousMode/Src/stm32l4xx_hal_msp.c
    * @author  CL
    * @version V4.0.0
    * @date    1-May-2017
    * @brief   HAL MSP module.
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
    *
    * Redistribution and use in source and binary forms, with or without modification,
    * are permitted provided that the following conditions are met:
    *   1. Redistributions of source code must retain the above copyright notice,
    *      this list of conditions and the following disclaimer.
    *   2. Redistributions in binary form must reproduce the above copyright notice,
    *      this list of conditions and the following disclaimer in the documentation
    *      and/or other materials provided with the distribution.
    *   3. Neither the name of STMicroelectronics nor the names of its contributors
    *      may be used to endorse or promote products derived from this software
    *      without specific prior written permission.
    *
    * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
    * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
    * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
    * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
    * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    *
    ******************************************************************************
    */
  
  /* Includes ------------------------------------------------------------------*/
  #include "main.h"
  
  /** @addtogroup X_NUCLEO_IKS01A1_Examples
    * @{
    */
  
  /** @addtogroup FIFO_CONTINUOUS_MODE
    * @{
    */
  
  int use_LSI = 0;
  
  /* Private typedef -----------------------------------------------------------*/
  /* Private define ------------------------------------------------------------*/
  /* Private macro -------------------------------------------------------------*/
  /* Private variables ---------------------------------------------------------*/
  /* Private function prototypes -----------------------------------------------*/
  /* Private functions ---------------------------------------------------------*/
  
  /**
    * @brief RTC MSP Initialization
    *        This function configures the hardware resources used in this example
    * @param hrtc: RTC handle pointer
    *
    * @note  Care must be taken when HAL_RCCEx_PeriphCLKConfig() is used to select
    *        the RTC clock source; in this case the Backup domain will be reset in
    *        order to modify the RTC Clock source, as consequence RTC registers (including
    *        the backup registers) and RCC_BDCR register are set to their reset values.
    *
    * @retval None
    */
  void HAL_RTC_MspInit(RTC_HandleTypeDef *hrtc)
  {
    RCC_OscInitTypeDef        RCC_OscInitStruct;
    RCC_PeriphCLKInitTypeDef  PeriphClkInitStruct;
  
    /*##-1- Enables the PWR Clock and Enables access to the backup domain ###################################*/
    /* To change the source clock of the RTC feature (LSE, LSI), You have to:
       - Enable the power clock using __HAL_RCC_PWR_CLK_ENABLE()
       - Enable write access using HAL_PWR_EnableBkUpAccess() function before to
         configure the RTC clock source (to be done once after reset).
       - Reset the Back up Domain using __HAL_RCC_BACKUPRESET_FORCE() and
         __HAL_RCC_BACKUPRESET_RELEASE().
       - Configure the needed RTC clock source */
    __HAL_RCC_PWR_CLK_ENABLE();
    HAL_PWR_EnableBkUpAccess();
  
    /*##-2- Configue LSE/LSI as RTC clock soucre ###############################*/
    if(use_LSI == 0)
    {
      RCC_OscInitStruct.OscillatorType =  RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
      RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
      RCC_OscInitStruct.LSEState = RCC_LSE_ON;
      RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
      if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
      {
        Error_Handler(__func__);
      }
  
      PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
      PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
      if(HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
      {
        Error_Handler(__func__);
      }
    }
    else
    {
      RCC_OscInitStruct.OscillatorType =  RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE;
      RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
      RCC_OscInitStruct.LSIState = RCC_LSI_ON;
      RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
      if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
      {
        Error_Handler(__func__);
      }
  
      PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
      PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
      if(HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
      {
        Error_Handler(__func__);
      }
    }
  
    /*##-2- Enable RTC peripheral Clocks #######################################*/
    /* Enable RTC Clock */
    __HAL_RCC_RTC_ENABLE();
  
    /*##-4- Configure the NVIC for RTC Alarm ###################################*/
    HAL_NVIC_SetPriority(RTC_Alarm_IRQn, 0x0F, 0);
    HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn);
  }
  
  /**
    * @brief RTC MSP De-Initialization
    *        This function frees the hardware resources used in this example:
    *          - Disable the Peripheral's clock
    * @param hrtc: RTC handle pointer
    * @retval None
    */
  void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc)
  {
    /*##-1- Reset peripherals ##################################################*/
    __HAL_RCC_RTC_DISABLE();
  }
  
  /**
    * @}
    */
  
  /**
    * @}
    */
  
  /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  