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/**

  ******************************************************************************

  * @file    stm32l1xx_hal_rcc_ex.c

  * @author  MCD Application Team

  * @brief   Extended RCC HAL module driver.

  *          This file provides firmware functions to manage the following

  *          functionalities RCC extension peripheral:

  *           + Extended Peripheral Control functions

  *

  ******************************************************************************

  * @attention

  *

  * <h2><center>&copy; Copyright(c) 2017 STMicroelectronics.

  * All rights reserved.</center></h2>

  *

  * This software component is licensed by ST under BSD 3-Clause license,

  * the "License"; You may not use this file except in compliance with the

  * License. You may obtain a copy of the License at:

  *                        opensource.org/licenses/BSD-3-Clause

  *

  ******************************************************************************

  */

/* Includes ------------------------------------------------------------------*/

#include "stm32l1xx_hal.h"

/** @addtogroup STM32L1xx_HAL_Driver

  * @{

  */

#ifdef HAL_RCC_MODULE_ENABLED

/** @defgroup RCCEx RCCEx

  * @brief RCC Extension HAL module driver

  * @{

  */

/* Private typedef -----------------------------------------------------------*/

/* Private define ------------------------------------------------------------*/

/** @defgroup RCCEx_Private_Constants RCCEx Private Constants

  * @{

  */

/**

  * @}

  */

/* Private macro -------------------------------------------------------------*/

/** @defgroup RCCEx_Private_Macros RCCEx Private Macros

  * @{

  */

/**

  * @}

  */

/* Private variables ---------------------------------------------------------*/

/* Private function prototypes -----------------------------------------------*/

/* Private functions ---------------------------------------------------------*/

/** @defgroup RCCEx_Exported_Functions RCCEx Exported Functions

  * @{

  */

/** @defgroup RCCEx_Exported_Functions_Group1 Extended Peripheral Control functions

 *  @brief  Extended Peripheral Control functions

 *

@verbatim

 ===============================================================================

                ##### Extended Peripheral Control functions  #####

 ===============================================================================

    [..]

    This subsection provides a set of functions allowing to control the RCC Clocks

    frequencies.

    [..]

    (@) Important 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) are set to their reset values.

@endverbatim

  * @{

  */

/**

  * @brief  Initializes the RCC extended peripherals clocks according to the specified

  *         parameters in the RCC_PeriphCLKInitTypeDef.

  * @param  PeriphClkInit pointer to an RCC_PeriphCLKInitTypeDef structure that

  *         contains the configuration information for the Extended Peripherals clocks(RTC/LCD clock).

  * @retval HAL status

  * @note   If HAL_ERROR returned, first switch-OFF HSE clock oscillator with @ref HAL_RCC_OscConfig()

  *         to possibly update HSE divider.

  */

HAL_StatusTypeDef HAL_RCCEx_PeriphCLKConfig(RCC_PeriphCLKInitTypeDef  *PeriphClkInit)

{

  uint32_t tickstart;

  uint32_t temp_reg;

  /* Check the parameters */

  assert_param(IS_RCC_PERIPHCLOCK(PeriphClkInit->PeriphClockSelection));

  /*------------------------------- RTC/LCD Configuration ------------------------*/

  if ((((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_RTC) == RCC_PERIPHCLK_RTC)

#if defined(LCD)

   || (((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_LCD) == RCC_PERIPHCLK_LCD)

#endif /* LCD */

     )

  {

    /* check for RTC Parameters used to output RTCCLK */

    if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_RTC) == RCC_PERIPHCLK_RTC)

    {

      assert_param(IS_RCC_RTCCLKSOURCE(PeriphClkInit->RTCClockSelection));

    }

#if defined(LCD)

    if(((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_LCD) == RCC_PERIPHCLK_LCD)

    {

      assert_param(IS_RCC_RTCCLKSOURCE(PeriphClkInit->LCDClockSelection));

    }

#endif /* LCD */

    FlagStatus       pwrclkchanged = RESET;

    /* As soon as function is called to change RTC clock source, activation of the

       power domain is done. */

    /* Requires to enable write access to Backup Domain of necessary */

    if(__HAL_RCC_PWR_IS_CLK_DISABLED())

    {

      __HAL_RCC_PWR_CLK_ENABLE();

      pwrclkchanged = SET;

    }

    if(HAL_IS_BIT_CLR(PWR->CR, PWR_CR_DBP))

    {

      /* Enable write access to Backup domain */

      SET_BIT(PWR->CR, PWR_CR_DBP);

      /* Wait for Backup domain Write protection disable */

      tickstart = HAL_GetTick();

      while(HAL_IS_BIT_CLR(PWR->CR, PWR_CR_DBP))

      {

        if((HAL_GetTick() - tickstart) > RCC_DBP_TIMEOUT_VALUE)

        {

          return HAL_TIMEOUT;

        }

      }

    }

    /* Check if user wants to change HSE RTC prescaler whereas HSE is enabled */

    temp_reg = (RCC->CR & RCC_CR_RTCPRE);

    if ((temp_reg != (PeriphClkInit->RTCClockSelection & RCC_CR_RTCPRE))

#if defined (LCD)

     || (temp_reg != (PeriphClkInit->LCDClockSelection & RCC_CR_RTCPRE))

#endif /* LCD */

       )

    { /* Check HSE State */

      if ((PeriphClkInit->RTCClockSelection & RCC_CSR_RTCSEL) == RCC_CSR_RTCSEL_HSE)

      {

        if (HAL_IS_BIT_SET(RCC->CR, RCC_CR_HSERDY))

        {

          /* To update HSE divider, first switch-OFF HSE clock oscillator*/

          return HAL_ERROR;

        }

      }

    }

    /* Reset the Backup domain only if the RTC Clock source selection is modified from reset value */

    temp_reg = (RCC->CSR & RCC_CSR_RTCSEL);

    if((temp_reg != 0x00000000U) && (((temp_reg != (PeriphClkInit->RTCClockSelection & RCC_CSR_RTCSEL)) \

      && (((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_RTC) == RCC_PERIPHCLK_RTC))

#if defined(LCD)

      || ((temp_reg != (PeriphClkInit->LCDClockSelection & RCC_CSR_RTCSEL)) \

       && (((PeriphClkInit->PeriphClockSelection) & RCC_PERIPHCLK_LCD) == RCC_PERIPHCLK_LCD))

#endif /* LCD */

     ))

    {

      /* Store the content of CSR register before the reset of Backup Domain */

      temp_reg = (RCC->CSR & ~(RCC_CSR_RTCSEL));

      /* RTC Clock selection can be changed only if the Backup Domain is reset */

      __HAL_RCC_BACKUPRESET_FORCE();

      __HAL_RCC_BACKUPRESET_RELEASE();

      /* Restore the Content of CSR register */

      RCC->CSR = temp_reg;

       /* Wait for LSERDY if LSE was enabled */

      if (HAL_IS_BIT_SET(temp_reg, RCC_CSR_LSEON))

      {

        /* Get Start Tick */

        tickstart = HAL_GetTick();

        /* Wait till LSE is ready */

        while(__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == 0U)

        {

          if((HAL_GetTick() - tickstart ) > RCC_LSE_TIMEOUT_VALUE)

          {

            return HAL_TIMEOUT;

          }

        }

      }

    }

    __HAL_RCC_RTC_CONFIG(PeriphClkInit->RTCClockSelection);

    /* Require to disable power clock if necessary */

    if(pwrclkchanged == SET)

    {

      __HAL_RCC_PWR_CLK_DISABLE();

    }

  }

  return HAL_OK;

}

/**

  * @brief  Get the PeriphClkInit according to the internal RCC configuration registers.

  * @param  PeriphClkInit pointer to an RCC_PeriphCLKInitTypeDef structure that

  *         returns the configuration information for the Extended Peripherals clocks(RTC/LCD clocks).

  * @retval None

  */

void HAL_RCCEx_GetPeriphCLKConfig(RCC_PeriphCLKInitTypeDef  *PeriphClkInit)

{

  uint32_t srcclk;

  /* Set all possible values for the extended clock type parameter------------*/

  PeriphClkInit->PeriphClockSelection = RCC_PERIPHCLK_RTC;

#if defined(LCD)

  PeriphClkInit->PeriphClockSelection |= RCC_PERIPHCLK_LCD;

#endif /* LCD */

  /* Get the RTC/LCD configuration -----------------------------------------------*/

  srcclk = __HAL_RCC_GET_RTC_SOURCE();

  if (srcclk != RCC_RTCCLKSOURCE_HSE_DIV2)

  {

    /* Source clock is LSE or LSI*/

    PeriphClkInit->RTCClockSelection = srcclk;

  }

  else

  {

    /* Source clock is HSE. Need to get the prescaler value*/

    PeriphClkInit->RTCClockSelection = srcclk | (READ_BIT(RCC->CR, RCC_CR_RTCPRE));

  }

#if defined(LCD)

  PeriphClkInit->LCDClockSelection = PeriphClkInit->RTCClockSelection;

#endif /* LCD */

}

/**

  * @brief  Return the peripheral clock frequency

  * @note   Return 0 if peripheral clock is unknown

  * @param  PeriphClk Peripheral clock identifier

  *         This parameter can be one of the following values:

  *            @arg @ref RCC_PERIPHCLK_RTC      RTC peripheral clock

  *            @arg @ref RCC_PERIPHCLK_LCD      LCD peripheral clock (*)

  * @note   (*) means that this peripheral is not present on all the devices

  * @retval Frequency in Hz (0: means that no available frequency for the peripheral)

  */

uint32_t HAL_RCCEx_GetPeriphCLKFreq(uint32_t PeriphClk)

{

  uint32_t frequency = 0;

  uint32_t srcclk;

  /* Check the parameters */

  assert_param(IS_RCC_PERIPHCLOCK(PeriphClk));

  switch (PeriphClk)

  {

  case RCC_PERIPHCLK_RTC:

#if defined(LCD)

  case RCC_PERIPHCLK_LCD:

#endif /* LCD */

    {

      /* Get the current RTC source */

      srcclk = __HAL_RCC_GET_RTC_SOURCE();

      /* Check if LSE is ready if RTC clock selection is LSE */

      if (srcclk == RCC_RTCCLKSOURCE_LSE)

      {

        if (HAL_IS_BIT_SET(RCC->CSR, RCC_CSR_LSERDY))

        {

          frequency = LSE_VALUE;

        }

      }

      /* Check if LSI is ready if RTC clock selection is LSI */

      else if (srcclk == RCC_RTCCLKSOURCE_LSI)

      {

        if (HAL_IS_BIT_SET(RCC->CSR, RCC_CSR_LSIRDY))

        {

          frequency = LSI_VALUE;

        }

      }

      /* Check if HSE is ready and if RTC clock selection is HSE */

      else if (srcclk == RCC_RTCCLKSOURCE_HSE_DIVX)

      {

        if (HAL_IS_BIT_SET(RCC->CR, RCC_CR_HSERDY))

        {

          /* Get the current HSE clock divider */

          switch (__HAL_RCC_GET_RTC_HSE_PRESCALER())

          {

            case RCC_RTC_HSE_DIV_16:  /* HSE DIV16 has been selected */

            {

              frequency = HSE_VALUE / 16U;

              break;

            }

            case RCC_RTC_HSE_DIV_8:   /* HSE DIV8 has been selected  */

            {

              frequency = HSE_VALUE / 8U;

              break;

            }

            case RCC_RTC_HSE_DIV_4:   /* HSE DIV4 has been selected  */

            {

              frequency = HSE_VALUE / 4U;

              break;

            }

            default:                  /* HSE DIV2 has been selected  */

            {

              frequency = HSE_VALUE / 2U;

              break;

            }

          }

        }

      }

      else

      {

        /* No clock source, frequency default init at 0 */

      }

      break;

    }

  default:

    break;

  }

  return(frequency);

}

#if defined(RCC_LSECSS_SUPPORT)

/**

  * @brief  Enables the LSE Clock Security System.

  * @note   If a failure is detected on the external 32 kHz oscillator, the LSE clock is no longer supplied

  *         to the RTC but no hardware action is made to the registers.

  *         In Standby mode a wakeup is generated. In other modes an interrupt can be sent to wakeup

  *         the software (see Section 5.3.4: Clock interrupt register (RCC_CIR) on page 104).

  *         The software MUST then disable the LSECSSON bit, stop the defective 32 kHz oscillator

  *         (disabling LSEON), and can change the RTC clock source (no clock or LSI or HSE, with

  *         RTCSEL), or take any required action to secure the application.

  * @note   LSE CSS available only for high density and medium+ devices

  * @retval None

  */

void HAL_RCCEx_EnableLSECSS(void)

{

  *(__IO uint32_t *) CSR_LSECSSON_BB = (uint32_t)ENABLE;

}

/**

  * @brief  Disables the LSE Clock Security System.

  * @note   Once enabled this bit cannot be disabled, except after an LSE failure detection

  *         (LSECSSD=1). In that case the software MUST disable the LSECSSON bit.

  *         Reset by power on reset and RTC software reset (RTCRST bit).

  * @note   LSE CSS available only for high density and medium+ devices

  * @retval None

  */

void HAL_RCCEx_DisableLSECSS(void)

{

  /* Disable LSE CSS */

  *(__IO uint32_t *) CSR_LSECSSON_BB = (uint32_t)DISABLE;

  /* Disable LSE CSS IT */

  __HAL_RCC_DISABLE_IT(RCC_IT_LSECSS);

}

/**

  * @brief  Enable the LSE Clock Security System IT & corresponding EXTI line.

  * @note   LSE Clock Security System IT is mapped on RTC EXTI line 19

  * @retval None

  */

void HAL_RCCEx_EnableLSECSS_IT(void)

{

  /* Enable LSE CSS */

  *(__IO uint32_t *) CSR_LSECSSON_BB = (uint32_t)ENABLE;

  /* Enable LSE CSS IT */

  __HAL_RCC_ENABLE_IT(RCC_IT_LSECSS);

  /* Enable IT on EXTI Line 19 */

  __HAL_RCC_LSECSS_EXTI_ENABLE_IT();

  __HAL_RCC_LSECSS_EXTI_ENABLE_RISING_EDGE();

}

/**

  * @brief Handle the RCC LSE Clock Security System interrupt request.

  * @retval None

  */

void HAL_RCCEx_LSECSS_IRQHandler(void)

{

  /* Check RCC LSE CSSF flag  */

  if(__HAL_RCC_GET_IT(RCC_IT_LSECSS))

  {

    /* RCC LSE Clock Security System interrupt user callback */

    HAL_RCCEx_LSECSS_Callback();

    /* Clear RCC LSE CSS pending bit */

    __HAL_RCC_CLEAR_IT(RCC_IT_LSECSS);

  }

}

/**

  * @brief  RCCEx LSE Clock Security System interrupt callback.

  * @retval none

  */

__weak void HAL_RCCEx_LSECSS_Callback(void)

{

  /* NOTE : This function should not be modified, when the callback is needed,

            the @ref HAL_RCCEx_LSECSS_Callback should be implemented in the user file

   */

}

#endif /* RCC_LSECSS_SUPPORT */

/**

  * @}

  */

/**

  * @}

  */

/**

  * @}

  */

/**

  * @}

  */

#endif /* HAL_RCC_MODULE_ENABLED */

/**

  * @}

  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/