/**
  ******************************************************************************
  * @file    stm32l0xx_hal_rtc.c
  * @author  MCD Application Team
  * @brief   RTC HAL module driver.
  *          This file provides firmware functions to manage the following
  *          functionalities of the Real-Time Clock (RTC) peripheral:
  *           + Initialization and de-initialization functions
  *           + RTC Calendar (Time and Date) configuration functions
  *           + RTC Alarms (Alarm A and Alarm B) configuration functions
  *           + Peripheral Control functions
  *           + Peripheral State functions
  *
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2016 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  @verbatim
  ==============================================================================
               ##### RTC and Backup Domain Operating Condition #####
  ==============================================================================
  [..] The real-time clock (RTC) and the RTC backup registers can be powered
       from the VBAT voltage when the main VDD supply is powered off.
       To retain the content of the RTC backup registers and supply the RTC when
       VDD is turned off, VBAT pin can be connected to an optional standby
       voltage supplied by a battery or by another source.

  [..] To allow the RTC operating even when the main digital supply (VDD) is turned
       off, the VBAT pin powers the following blocks:
    (#) The RTC
    (#) The LSE oscillator
    (#) PC13 to PC15 I/Os, plus PA0 and PE6 I/Os (when available)

  [..] When the backup domain is supplied by VDD (analog switch connected to VDD),
       the following pins are available:
    (#) PC14 and PC15 can be used as either GPIO or LSE pins
    (#) PC13 can be used as a GPIO or as the RTC_AF1 pin
    (#) PA0 can be used as a GPIO or as the RTC_AF2 pin
    (#) PE6 can be used as a GPIO or as the RTC_AF3 pin

  [..] When the backup domain is supplied by VBAT (analog switch connected to VBAT
       because VDD is not present), the following pins are available:
    (#) PC14 and PC15 can be used as LSE pins only
    (#) PC13 can be used as the RTC_AF1 pin
    (#) PA0 can be used as the RTC_AF2 pin
    (#) PE6 can be used as the RTC_AF3 pin

                   ##### Backup Domain Reset #####
  ==================================================================
  [..] The backup domain reset sets all RTC registers and the RCC_BDCR register
       to their reset values.
  [..] A backup domain reset is generated when one of the following events occurs:
    (#) Software reset, triggered by setting the BDRST bit in the
        RCC Backup domain control register (RCC_BDCR).
    (#) VDD or VBAT power on, if both supplies have previously been powered off.
    (#) Tamper detection event resets all data backup registers.

                   ##### Backup Domain Access #####
  ==================================================================
  [..] After reset, the backup domain (RTC registers, RTC backup data registers
       is protected against possible unwanted write accesses.
  [..] To enable access to the RTC Domain and RTC registers, proceed as follows:
    (+) Enable the Power Controller (PWR) APB1 interface clock using the
        __HAL_RCC_PWR_CLK_ENABLE() macro.
    (+) Enable access to RTC domain using the HAL_PWR_EnableBkUpAccess() function.
    (+) Select the RTC clock source using the __HAL_RCC_RTC_CONFIG() macro.
    (+) Enable RTC Clock using the __HAL_RCC_RTC_ENABLE() macro.

  ==============================================================================
                        ##### How to use this driver #####
  ==============================================================================
  [..]
    (+) Enable the RTC domain access (see description in the section above).
    (+) Configure the RTC Prescaler (Asynchronous and Synchronous) and RTC hour
        format using the HAL_RTC_Init() function.

  *** Time and Date configuration ***
  ===================================
  [..]
    (+) To configure the RTC Calendar (Time and Date) use the HAL_RTC_SetTime()
        and HAL_RTC_SetDate() functions.
    (+) To read the RTC Calendar, use the HAL_RTC_GetTime() and HAL_RTC_GetDate()
        functions.
    (+) To manage the RTC summer or winter time change, use the following
        functions:
        (++) HAL_RTC_DST_Add1Hour() or HAL_RTC_DST_Sub1Hour to add or subtract
             1 hour from the calendar time.
        (++) HAL_RTC_DST_SetStoreOperation() or HAL_RTC_DST_ClearStoreOperation
             to memorize whether the time change has been performed or not.

  *** Alarm configuration ***
  ===========================
  [..]
    (+) To configure the RTC Alarm use the HAL_RTC_SetAlarm() function.
        You can also configure the RTC Alarm with interrupt mode using the
        HAL_RTC_SetAlarm_IT() function.
    (+) To read the RTC Alarm, use the HAL_RTC_GetAlarm() function.

                  ##### RTC and low power modes #####
  ==================================================================
  [..] The MCU can be woken up from a low power mode by an RTC alternate
       function.
  [..] The RTC alternate functions are the RTC alarms (Alarm A and Alarm B),
       RTC wakeup, RTC tamper event detection and RTC timestamp event detection.
       These RTC alternate functions can wake up the system from the Stop and
       Standby low power modes.
  [..] The system can also wake up from low power modes without depending
       on an external interrupt (Auto-wakeup mode), by using the RTC alarm
       or the RTC wakeup events.
  [..] The RTC provides a programmable time base for waking up from the
       Stop or Standby mode at regular intervals.
       Wakeup from STOP and STANDBY modes is possible only when the RTC clock
       source is LSE or LSI.

  *** Callback registration ***
  =============================================
  [..]
  The compilation define  USE_HAL_RTC_REGISTER_CALLBACKS when set to 1
  allows the user to configure dynamically the driver callbacks.
  Use Function HAL_RTC_RegisterCallback() to register an interrupt callback.
  [..]
  Function HAL_RTC_RegisterCallback() allows to register following callbacks:
    (+) AlarmAEventCallback          : RTC Alarm A Event callback.
    (+) AlarmBEventCallback          : RTC Alarm B Event callback.
    (+) TimeStampEventCallback       : RTC Timestamp Event callback.
    (+) WakeUpTimerEventCallback     : RTC WakeUpTimer Event callback.
    (+) Tamper1EventCallback         : RTC Tamper 1 Event callback.
    (+) Tamper2EventCallback         : RTC Tamper 2 Event callback.
    (+) Tamper3EventCallback         : RTC Tamper 3 Event callback.
    (+) MspInitCallback              : RTC MspInit callback.
    (+) MspDeInitCallback            : RTC MspDeInit callback.
  [..]
  This function takes as parameters the HAL peripheral handle, the Callback ID
  and a pointer to the user callback function.
  [..]
  Use function HAL_RTC_UnRegisterCallback() to reset a callback to the default
  weak function.
  HAL_RTC_UnRegisterCallback() takes as parameters the HAL peripheral handle,
  and the Callback ID.
  This function allows to reset following callbacks:
    (+) AlarmAEventCallback          : RTC Alarm A Event callback.
    (+) AlarmBEventCallback          : RTC Alarm B Event callback.
    (+) TimeStampEventCallback       : RTC Timestamp Event callback.
    (+) WakeUpTimerEventCallback     : RTC WakeUpTimer Event callback.
    (+) Tamper1EventCallback         : RTC Tamper 1 Event callback.
    (+) Tamper2EventCallback         : RTC Tamper 2 Event callback.
    (+) Tamper3EventCallback         : RTC Tamper 3 Event callback.
    (+) MspInitCallback              : RTC MspInit callback.
    (+) MspDeInitCallback            : RTC MspDeInit callback.
  [..]
  By default, after the HAL_RTC_Init() and when the state is HAL_RTC_STATE_RESET,
  all callbacks are set to the corresponding weak functions:
  examples AlarmAEventCallback(), WakeUpTimerEventCallback().
  Exception done for MspInit() and MspDeInit() callbacks that are reset to the
  legacy weak function in the HAL_RTC_Init()/HAL_RTC_DeInit() only
  when these callbacks are null (not registered beforehand).
  If not, MspInit() or MspDeInit() are not null, HAL_RTC_Init()/HAL_RTC_DeInit()
  keep and use the user MspInit()/MspDeInit() callbacks (registered beforehand).
  [..]
  Callbacks can be registered/unregistered in HAL_RTC_STATE_READY state only.
  Exception done MspInit()/MspDeInit() that can be registered/unregistered
  in HAL_RTC_STATE_READY or HAL_RTC_STATE_RESET state.
  Thus registered (user) MspInit()/MspDeInit() callbacks can be used during the
  Init/DeInit.
  In that case first register the MspInit()/MspDeInit() user callbacks
  using HAL_RTC_RegisterCallback() before calling HAL_RTC_DeInit()
  or HAL_RTC_Init() functions.
  [..]
  When The compilation define USE_HAL_RTC_REGISTER_CALLBACKS is set to 0 or
  not defined, the callback registration feature is not available and all
  callbacks are set to the corresponding weak functions.

  @endverbatim
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "stm32l0xx_hal.h"

/** @addtogroup STM32L0xx_HAL_Driver
  * @{
  */

/** @defgroup RTC RTC
  * @brief    RTC HAL module driver
  * @{
  */

#ifdef HAL_RTC_MODULE_ENABLED

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Exported functions --------------------------------------------------------*/

/** @defgroup RTC_Exported_Functions RTC Exported Functions
  * @{
  */

/** @defgroup RTC_Exported_Functions_Group1 Initialization and de-initialization functions
  * @brief    Initialization and Configuration functions
  *
@verbatim
 ===============================================================================
              ##### Initialization and de-initialization functions #####
 ===============================================================================
   [..] This section provides functions allowing to initialize and configure the
         RTC Prescaler (Synchronous and Asynchronous), RTC Hour format, disable
         RTC registers Write protection, enter and exit the RTC initialization mode,
         RTC registers synchronization check and reference clock detection enable.
         (#) The RTC Prescaler is programmed to generate the RTC 1Hz time base.
             It is split into 2 programmable prescalers to minimize power consumption.
             (++) A 7-bit asynchronous prescaler and a 15-bit synchronous prescaler.
             (++) When both prescalers are used, it is recommended to configure the
                 asynchronous prescaler to a high value to minimize power consumption.
         (#) All RTC registers are Write protected. Writing to the RTC registers
             is enabled by writing a key into the Write Protection register, RTC_WPR.
         (#) To configure the RTC Calendar, user application should enter
             initialization mode. In this mode, the calendar counter is stopped
             and its value can be updated. When the initialization sequence is
             complete, the calendar restarts counting after 4 RTCCLK cycles.
         (#) To read the calendar through the shadow registers after Calendar
             initialization, calendar update or after wakeup from low power modes
             the software must first clear the RSF flag. The software must then
             wait until it is set again before reading the calendar, which means
             that the calendar registers have been correctly copied into the
             RTC_TR and RTC_DR shadow registers. The HAL_RTC_WaitForSynchro() function
             implements the above software sequence (RSF clear and RSF check).

@endverbatim
  * @{
  */

/**
  * @brief  Initializes the RTC peripheral
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_Init(RTC_HandleTypeDef *hrtc)
{
  HAL_StatusTypeDef status = HAL_ERROR;

  /* Check RTC handler validity */
  if (hrtc == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_RTC_ALL_INSTANCE(hrtc->Instance));
  assert_param(IS_RTC_HOUR_FORMAT(hrtc->Init.HourFormat));
  assert_param(IS_RTC_ASYNCH_PREDIV(hrtc->Init.AsynchPrediv));
  assert_param(IS_RTC_SYNCH_PREDIV(hrtc->Init.SynchPrediv));
  assert_param(IS_RTC_OUTPUT(hrtc->Init.OutPut));
  assert_param(IS_RTC_OUTPUT_REMAP(hrtc->Init.OutPutRemap));
  assert_param(IS_RTC_OUTPUT_POL(hrtc->Init.OutPutPolarity));
  assert_param(IS_RTC_OUTPUT_TYPE(hrtc->Init.OutPutType));

#if (USE_HAL_RTC_REGISTER_CALLBACKS == 1)
  if (hrtc->State == HAL_RTC_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    hrtc->Lock = HAL_UNLOCKED;

    hrtc->AlarmAEventCallback          =  HAL_RTC_AlarmAEventCallback;        /* Legacy weak AlarmAEventCallback      */
    hrtc->AlarmBEventCallback          =  HAL_RTCEx_AlarmBEventCallback;      /* Legacy weak AlarmBEventCallback      */
    hrtc->TimeStampEventCallback       =  HAL_RTCEx_TimeStampEventCallback;   /* Legacy weak TimeStampEventCallback   */
    hrtc->WakeUpTimerEventCallback     =  HAL_RTCEx_WakeUpTimerEventCallback; /* Legacy weak WakeUpTimerEventCallback */
#if defined(RTC_TAMPER1_SUPPORT)
    hrtc->Tamper1EventCallback         =  HAL_RTCEx_Tamper1EventCallback;     /* Legacy weak Tamper1EventCallback     */
#endif /* RTC_TAMPER1_SUPPORT */
    hrtc->Tamper2EventCallback         =  HAL_RTCEx_Tamper2EventCallback;     /* Legacy weak Tamper2EventCallback     */
#if defined(RTC_TAMPER3_SUPPORT)
    hrtc->Tamper3EventCallback         =  HAL_RTCEx_Tamper3EventCallback;     /* Legacy weak Tamper3EventCallback     */
#endif /* RTC_TAMPER3_SUPPORT */

    if (hrtc->MspInitCallback == NULL)
    {
      hrtc->MspInitCallback = HAL_RTC_MspInit;
    }
    /* Init the low level hardware */
    hrtc->MspInitCallback(hrtc);

    if (hrtc->MspDeInitCallback == NULL)
    {
      hrtc->MspDeInitCallback = HAL_RTC_MspDeInit;
    }
  }
#else /* USE_HAL_RTC_REGISTER_CALLBACKS */
  if (hrtc->State == HAL_RTC_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    hrtc->Lock = HAL_UNLOCKED;

    /* Initialize RTC MSP */
    HAL_RTC_MspInit(hrtc);
  }
#endif /* USE_HAL_RTC_REGISTER_CALLBACKS */

  /* Set RTC state */
  hrtc->State = HAL_RTC_STATE_BUSY;

  /* Check whether the calendar needs to be initialized */
  if (__HAL_RTC_IS_CALENDAR_INITIALIZED(hrtc) == 0U)
  {
    /* Disable the write protection for RTC registers */
    __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

    /* Enter Initialization mode */
    status = RTC_EnterInitMode(hrtc);

    if (status == HAL_OK)
    {
      /* Clear RTC_CR FMT, OSEL and POL Bits */
      hrtc->Instance->CR &= ((uint32_t)~(RTC_CR_FMT | RTC_CR_OSEL | RTC_CR_POL));
      /* Set RTC_CR register */
      hrtc->Instance->CR |= (uint32_t)(hrtc->Init.HourFormat | hrtc->Init.OutPut | hrtc->Init.OutPutPolarity);

      /* Configure the RTC PRER */
      hrtc->Instance->PRER = (uint32_t)(hrtc->Init.SynchPrediv);
      hrtc->Instance->PRER |= (uint32_t)(hrtc->Init.AsynchPrediv << RTC_PRER_PREDIV_A_Pos);

      /* Exit Initialization mode */
      status = RTC_ExitInitMode(hrtc);
    }

    if (status == HAL_OK)
    {
      hrtc->Instance->OR &= (uint32_t)~(RTC_OUTPUT_TYPE_PUSHPULL | RTC_OUTPUT_REMAP_POS1);
      hrtc->Instance->OR |= (uint32_t)(hrtc->Init.OutPutType | hrtc->Init.OutPutRemap);
    }

    /* Enable the write protection for RTC registers */
    __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
  }
  else
  {
    /* The calendar is already initialized */
    status = HAL_OK;
  }

  if (status == HAL_OK)
  {
    hrtc->State = HAL_RTC_STATE_READY;
  }

  return status;
}

/**
  * @brief  DeInitializes the RTC peripheral
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @note   This function does not reset the RTC Backup Data registers.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_DeInit(RTC_HandleTypeDef *hrtc)
{
  HAL_StatusTypeDef status = HAL_ERROR;

  /* Check the parameters */
  assert_param(IS_RTC_ALL_INSTANCE(hrtc->Instance));

  /* Set RTC state */
  hrtc->State = HAL_RTC_STATE_BUSY;

  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

  /* Enter Initialization mode */
  status = RTC_EnterInitMode(hrtc);

  if (status == HAL_OK)
  {
    /* Reset RTC registers */
    hrtc->Instance->TR = 0x00000000U;
    hrtc->Instance->DR = (RTC_DR_WDU_0 | RTC_DR_MU_0 | RTC_DR_DU_0);
    hrtc->Instance->CR  &= 0x00000000U;
    hrtc->Instance->WUTR = RTC_WUTR_WUT;
    hrtc->Instance->PRER = (uint32_t)(RTC_PRER_PREDIV_A | 0x000000FFU);
    hrtc->Instance->ALRMAR   = 0x00000000U;
    hrtc->Instance->ALRMBR   = 0x00000000U;
    hrtc->Instance->CALR     = 0x00000000U;
    hrtc->Instance->SHIFTR   = 0x00000000U;
    hrtc->Instance->ALRMASSR = 0x00000000U;
    hrtc->Instance->ALRMBSSR = 0x00000000U;

    /* Exit Initialization mode */
    status = RTC_ExitInitMode(hrtc);
  }

  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

  if (status == HAL_OK)
  {
    /* Reset Tamper and alternate functions configuration register */
    hrtc->Instance->TAMPCR = 0x00000000U;

    /* Reset Option register */
    hrtc->Instance->OR = 0x00000000U;

#if (USE_HAL_RTC_REGISTER_CALLBACKS == 1)
    if (hrtc->MspDeInitCallback == NULL)
    {
      hrtc->MspDeInitCallback = HAL_RTC_MspDeInit;
    }

    /* DeInit the low level hardware: CLOCK, NVIC.*/
    hrtc->MspDeInitCallback(hrtc);
#else /* USE_HAL_RTC_REGISTER_CALLBACKS */
    /* De-Initialize RTC MSP */
    HAL_RTC_MspDeInit(hrtc);
#endif /* USE_HAL_RTC_REGISTER_CALLBACKS */

    hrtc->State = HAL_RTC_STATE_RESET;
  }

  /* Release Lock */
  __HAL_UNLOCK(hrtc);

  return status;
}

#if (USE_HAL_RTC_REGISTER_CALLBACKS == 1)
/**
  * @brief  Registers a User RTC Callback
  *         To be used instead of the weak predefined callback
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  CallbackID ID of the callback to be registered
  *         This parameter can be one of the following values:
  *          @arg @ref HAL_RTC_ALARM_A_EVENT_CB_ID          Alarm A Event Callback ID
  *          @arg @ref HAL_RTC_ALARM_B_EVENT_CB_ID          Alarm B Event Callback ID
  *          @arg @ref HAL_RTC_TIMESTAMP_EVENT_CB_ID        Timestamp Event Callback ID
  *          @arg @ref HAL_RTC_WAKEUPTIMER_EVENT_CB_ID      Wakeup Timer Event Callback ID
  *          @arg @ref HAL_RTC_TAMPER1_EVENT_CB_ID          Tamper 1 Callback ID
  *          @arg @ref HAL_RTC_TAMPER2_EVENT_CB_ID          Tamper 2 Callback ID
  *          @arg @ref HAL_RTC_TAMPER3_EVENT_CB_ID          Tamper 3 Callback ID
  *          @arg @ref HAL_RTC_MSPINIT_CB_ID                Msp Init callback ID
  *          @arg @ref HAL_RTC_MSPDEINIT_CB_ID              Msp DeInit callback ID
  * @note   HAL_RTC_TAMPER1_EVENT_CB_ID is not applicable to all devices.
  * @note   HAL_RTC_TAMPER3_EVENT_CB_ID is not applicable to all devices.
  * @param  pCallback pointer to the Callback function
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_RegisterCallback(RTC_HandleTypeDef *hrtc, HAL_RTC_CallbackIDTypeDef CallbackID, pRTC_CallbackTypeDef pCallback)
{
  HAL_StatusTypeDef status = HAL_OK;

  if (pCallback == NULL)
  {
    return HAL_ERROR;
  }

  /* Process locked */
  __HAL_LOCK(hrtc);

  if (HAL_RTC_STATE_READY == hrtc->State)
  {
    switch (CallbackID)
    {
      case HAL_RTC_ALARM_A_EVENT_CB_ID :
        hrtc->AlarmAEventCallback = pCallback;
        break;

      case HAL_RTC_ALARM_B_EVENT_CB_ID :
        hrtc->AlarmBEventCallback = pCallback;
        break;

      case HAL_RTC_TIMESTAMP_EVENT_CB_ID :
        hrtc->TimeStampEventCallback = pCallback;
        break;

      case HAL_RTC_WAKEUPTIMER_EVENT_CB_ID :
        hrtc->WakeUpTimerEventCallback = pCallback;
        break;

#if defined(RTC_TAMPER1_SUPPORT)
      case HAL_RTC_TAMPER1_EVENT_CB_ID :
        hrtc->Tamper1EventCallback = pCallback;
        break;
#endif /* RTC_TAMPER1_SUPPORT */

      case HAL_RTC_TAMPER2_EVENT_CB_ID :
        hrtc->Tamper2EventCallback = pCallback;
        break;

#if defined(RTC_TAMPER3_SUPPORT)
      case HAL_RTC_TAMPER3_EVENT_CB_ID :
        hrtc->Tamper3EventCallback = pCallback;
        break;
#endif /* RTC_TAMPER3_SUPPORT */

      case HAL_RTC_MSPINIT_CB_ID :
        hrtc->MspInitCallback = pCallback;
        break;

      case HAL_RTC_MSPDEINIT_CB_ID :
        hrtc->MspDeInitCallback = pCallback;
        break;

      default :
        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else if (HAL_RTC_STATE_RESET == hrtc->State)
  {
    switch (CallbackID)
    {
      case HAL_RTC_MSPINIT_CB_ID :
        hrtc->MspInitCallback = pCallback;
        break;

      case HAL_RTC_MSPDEINIT_CB_ID :
        hrtc->MspDeInitCallback = pCallback;
        break;

      default :
        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else
  {
    /* Return error status */
    status =  HAL_ERROR;
  }

  /* Release Lock */
  __HAL_UNLOCK(hrtc);

  return status;
}

/**
  * @brief  Unregisters an RTC Callback
  *         RTC callback is redirected to the weak predefined callback
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  CallbackID ID of the callback to be unregistered
  *         This parameter can be one of the following values:
  *          @arg @ref HAL_RTC_ALARM_A_EVENT_CB_ID          Alarm A Event Callback ID
  *          @arg @ref HAL_RTC_ALARM_B_EVENT_CB_ID          Alarm B Event Callback ID
  *          @arg @ref HAL_RTC_TIMESTAMP_EVENT_CB_ID        Timestamp Event Callback ID
  *          @arg @ref HAL_RTC_WAKEUPTIMER_EVENT_CB_ID      Wakeup Timer Event Callback ID
  *          @arg @ref HAL_RTC_TAMPER1_EVENT_CB_ID          Tamper 1 Callback ID
  *          @arg @ref HAL_RTC_TAMPER2_EVENT_CB_ID          Tamper 2 Callback ID
  *          @arg @ref HAL_RTC_TAMPER3_EVENT_CB_ID          Tamper 3 Callback ID
  *          @arg @ref HAL_RTC_MSPINIT_CB_ID Msp Init callback ID
  *          @arg @ref HAL_RTC_MSPDEINIT_CB_ID Msp DeInit callback ID
  * @note   HAL_RTC_TAMPER1_EVENT_CB_ID is not applicable to all devices.
  * @note   HAL_RTC_TAMPER3_EVENT_CB_ID is not applicable to all devices.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_UnRegisterCallback(RTC_HandleTypeDef *hrtc, HAL_RTC_CallbackIDTypeDef CallbackID)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Process locked */
  __HAL_LOCK(hrtc);

  if (HAL_RTC_STATE_READY == hrtc->State)
  {
    switch (CallbackID)
    {
      case HAL_RTC_ALARM_A_EVENT_CB_ID :
        hrtc->AlarmAEventCallback = HAL_RTC_AlarmAEventCallback;             /* Legacy weak AlarmAEventCallback    */
        break;

      case HAL_RTC_ALARM_B_EVENT_CB_ID :
        hrtc->AlarmBEventCallback = HAL_RTCEx_AlarmBEventCallback;           /* Legacy weak AlarmBEventCallback */
        break;

      case HAL_RTC_TIMESTAMP_EVENT_CB_ID :
        hrtc->TimeStampEventCallback = HAL_RTCEx_TimeStampEventCallback;     /* Legacy weak TimeStampEventCallback    */
        break;

      case HAL_RTC_WAKEUPTIMER_EVENT_CB_ID :
        hrtc->WakeUpTimerEventCallback = HAL_RTCEx_WakeUpTimerEventCallback; /* Legacy weak WakeUpTimerEventCallback */
        break;

#if defined(RTC_TAMPER1_SUPPORT)
      case HAL_RTC_TAMPER1_EVENT_CB_ID :
        hrtc->Tamper1EventCallback = HAL_RTCEx_Tamper1EventCallback;         /* Legacy weak Tamper1EventCallback   */
        break;
#endif /* RTC_TAMPER1_SUPPORT */

      case HAL_RTC_TAMPER2_EVENT_CB_ID :
        hrtc->Tamper2EventCallback = HAL_RTCEx_Tamper2EventCallback;         /* Legacy weak Tamper2EventCallback         */
        break;

#if defined(RTC_TAMPER3_SUPPORT)
      case HAL_RTC_TAMPER3_EVENT_CB_ID :
        hrtc->Tamper3EventCallback = HAL_RTCEx_Tamper3EventCallback;         /* Legacy weak Tamper3EventCallback         */
        break;
#endif /* RTC_TAMPER3_SUPPORT */

      case HAL_RTC_MSPINIT_CB_ID :
        hrtc->MspInitCallback = HAL_RTC_MspInit;
        break;

      case HAL_RTC_MSPDEINIT_CB_ID :
        hrtc->MspDeInitCallback = HAL_RTC_MspDeInit;
        break;

      default :
        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else if (HAL_RTC_STATE_RESET == hrtc->State)
  {
    switch (CallbackID)
    {
      case HAL_RTC_MSPINIT_CB_ID :
        hrtc->MspInitCallback = HAL_RTC_MspInit;
        break;

      case HAL_RTC_MSPDEINIT_CB_ID :
        hrtc->MspDeInitCallback = HAL_RTC_MspDeInit;
        break;

      default :
        /* Return error status */
        status =  HAL_ERROR;
        break;
    }
  }
  else
  {
    /* Return error status */
    status =  HAL_ERROR;
  }

  /* Release Lock */
  __HAL_UNLOCK(hrtc);

  return status;
}
#endif /* USE_HAL_RTC_REGISTER_CALLBACKS */

/**
  * @brief  Initializes the RTC MSP.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
__weak void HAL_RTC_MspInit(RTC_HandleTypeDef *hrtc)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hrtc);

  /* NOTE: This function should not be modified, when the callback is needed,
           the HAL_RTC_MspInit could be implemented in the user file
   */
}

/**
  * @brief  DeInitializes the RTC MSP.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
__weak void HAL_RTC_MspDeInit(RTC_HandleTypeDef *hrtc)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hrtc);

  /* NOTE: This function should not be modified, when the callback is needed,
           the HAL_RTC_MspDeInit could be implemented in the user file
   */
}

/**
  * @}
  */

/** @defgroup RTC_Exported_Functions_Group2 RTC Time and Date functions
  * @brief    RTC Time and Date functions
  *
@verbatim
 ===============================================================================
                 ##### RTC Time and Date functions #####
 ===============================================================================

 [..] This section provides functions allowing to configure Time and Date features

@endverbatim
  * @{
  */

/**
  * @brief  Sets RTC current time.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  sTime Pointer to Time structure
  * @note   DayLightSaving and StoreOperation interfaces are deprecated.
  *         To manage Daylight Saving Time, please use HAL_RTC_DST_xxx functions.
  * @param  Format Specifies the format of the entered parameters.
  *          This parameter can be one of the following values:
  *            @arg RTC_FORMAT_BIN: Binary data format
  *            @arg RTC_FORMAT_BCD: BCD data format
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_SetTime(RTC_HandleTypeDef *hrtc, RTC_TimeTypeDef *sTime, uint32_t Format)
{
  uint32_t tmpreg = 0U;
  HAL_StatusTypeDef status;

  /* Check the parameters */
  assert_param(IS_RTC_FORMAT(Format));
  assert_param(IS_RTC_DAYLIGHT_SAVING(sTime->DayLightSaving));
  assert_param(IS_RTC_STORE_OPERATION(sTime->StoreOperation));

  /* Process Locked */
  __HAL_LOCK(hrtc);

  hrtc->State = HAL_RTC_STATE_BUSY;

  if (Format == RTC_FORMAT_BIN)
  {
    if ((hrtc->Instance->CR & RTC_CR_FMT) != 0U)
    {
      assert_param(IS_RTC_HOUR12(sTime->Hours));
      assert_param(IS_RTC_HOURFORMAT12(sTime->TimeFormat));
    }
    else
    {
      sTime->TimeFormat = 0x00U;
      assert_param(IS_RTC_HOUR24(sTime->Hours));
    }
    assert_param(IS_RTC_MINUTES(sTime->Minutes));
    assert_param(IS_RTC_SECONDS(sTime->Seconds));

    tmpreg = (uint32_t)(( (uint32_t)RTC_ByteToBcd2(sTime->Hours)   << RTC_TR_HU_Pos)  | \
                        ( (uint32_t)RTC_ByteToBcd2(sTime->Minutes) << RTC_TR_MNU_Pos) | \
                        ( (uint32_t)RTC_ByteToBcd2(sTime->Seconds))                   | \
                        (((uint32_t)sTime->TimeFormat)             << RTC_TR_PM_Pos));
  }
  else
  {
    if ((hrtc->Instance->CR & RTC_CR_FMT) != 0U)
    {
      assert_param(IS_RTC_HOUR12(RTC_Bcd2ToByte(sTime->Hours)));
      assert_param(IS_RTC_HOURFORMAT12(sTime->TimeFormat));
    }
    else
    {
      sTime->TimeFormat = 0x00U;
      assert_param(IS_RTC_HOUR24(RTC_Bcd2ToByte(sTime->Hours)));
    }
    assert_param(IS_RTC_MINUTES(RTC_Bcd2ToByte(sTime->Minutes)));
    assert_param(IS_RTC_SECONDS(RTC_Bcd2ToByte(sTime->Seconds)));
    tmpreg = (((uint32_t)(sTime->Hours)      << RTC_TR_HU_Pos)  | \
              ((uint32_t)(sTime->Minutes)    << RTC_TR_MNU_Pos) | \
              ((uint32_t) sTime->Seconds)                       | \
              ((uint32_t)(sTime->TimeFormat) << RTC_TR_PM_Pos));
  }

  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

  /* Enter Initialization mode */
  status = RTC_EnterInitMode(hrtc);

  if (status == HAL_OK)
  {
    /* Set the RTC_TR register */
    hrtc->Instance->TR = (uint32_t)(tmpreg & RTC_TR_RESERVED_MASK);

    /* Clear the bits to be configured (Deprecated. Use HAL_RTC_DST_xxx functions instead) */
    hrtc->Instance->CR &= (uint32_t)~RTC_CR_BKP;

    /* Configure the RTC_CR register (Deprecated. Use HAL_RTC_DST_xxx functions instead) */
    hrtc->Instance->CR |= (uint32_t)(sTime->DayLightSaving | sTime->StoreOperation);

    /* Exit Initialization mode */
    status = RTC_ExitInitMode(hrtc);
  }

  if (status == HAL_OK)
  {
    hrtc->State = HAL_RTC_STATE_READY;
  }

  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

  /* Process Unlocked */
  __HAL_UNLOCK(hrtc);

  return status;
}

/**
  * @brief  Gets RTC current time.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  sTime Pointer to Time structure
  * @param  Format Specifies the format of the entered parameters.
  *          This parameter can be one of the following values:
  *            @arg RTC_FORMAT_BIN: Binary data format
  *            @arg RTC_FORMAT_BCD: BCD data format
  * @note  You can use SubSeconds and SecondFraction (sTime structure fields
  *        returned) to convert SubSeconds value in second fraction ratio with
  *        time unit following generic formula:
  *        Second fraction ratio * time_unit =
  *           [(SecondFraction - SubSeconds) / (SecondFraction + 1)] * time_unit
  *        This conversion can be performed only if no shift operation is pending
  *        (ie. SHFP=0) when PREDIV_S >= SS
  * @note  You must call HAL_RTC_GetDate() after HAL_RTC_GetTime() to unlock the
  *        values in the higher-order calendar shadow registers to ensure
  *        consistency between the time and date values.
  *        Reading RTC current time locks the values in calendar shadow registers
  *        until current date is read to ensure consistency between the time and
  *        date values.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_GetTime(RTC_HandleTypeDef *hrtc, RTC_TimeTypeDef *sTime, uint32_t Format)
{
  uint32_t tmpreg = 0U;

  /* Check the parameters */
  assert_param(IS_RTC_FORMAT(Format));

  /* Get subseconds value from the corresponding register */
  sTime->SubSeconds = (uint32_t)(hrtc->Instance->SSR);

  /* Get SecondFraction structure field from the corresponding register field*/
  sTime->SecondFraction = (uint32_t)(hrtc->Instance->PRER & RTC_PRER_PREDIV_S);

  /* Get the TR register */
  tmpreg = (uint32_t)(hrtc->Instance->TR & RTC_TR_RESERVED_MASK);

  /* Fill the structure fields with the read parameters */
  sTime->Hours      = (uint8_t)((tmpreg & (RTC_TR_HT  | RTC_TR_HU))  >> RTC_TR_HU_Pos);
  sTime->Minutes    = (uint8_t)((tmpreg & (RTC_TR_MNT | RTC_TR_MNU)) >> RTC_TR_MNU_Pos);
  sTime->Seconds    = (uint8_t)( tmpreg & (RTC_TR_ST  | RTC_TR_SU));
  sTime->TimeFormat = (uint8_t)((tmpreg & (RTC_TR_PM))               >> RTC_TR_PM_Pos);

  /* Check the input parameters format */
  if (Format == RTC_FORMAT_BIN)
  {
    /* Convert the time structure parameters to Binary format */
    sTime->Hours = (uint8_t)RTC_Bcd2ToByte(sTime->Hours);
    sTime->Minutes = (uint8_t)RTC_Bcd2ToByte(sTime->Minutes);
    sTime->Seconds = (uint8_t)RTC_Bcd2ToByte(sTime->Seconds);
  }

  return HAL_OK;
}

/**
  * @brief  Sets RTC current date.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  sDate Pointer to date structure
  * @param  Format specifies the format of the entered parameters.
  *          This parameter can be one of the following values:
  *            @arg RTC_FORMAT_BIN: Binary data format
  *            @arg RTC_FORMAT_BCD: BCD data format
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_SetDate(RTC_HandleTypeDef *hrtc, RTC_DateTypeDef *sDate, uint32_t Format)
{
  uint32_t datetmpreg = 0U;
  HAL_StatusTypeDef status;

  /* Check the parameters */
  assert_param(IS_RTC_FORMAT(Format));

  /* Process Locked */
  __HAL_LOCK(hrtc);

  hrtc->State = HAL_RTC_STATE_BUSY;

  if ((Format == RTC_FORMAT_BIN) && ((sDate->Month & 0x10U) == 0x10U))
  {
    sDate->Month = (uint8_t)((sDate->Month & (uint8_t)~(0x10U)) + (uint8_t)0x0AU);
  }

  assert_param(IS_RTC_WEEKDAY(sDate->WeekDay));

  if (Format == RTC_FORMAT_BIN)
  {
    assert_param(IS_RTC_YEAR(sDate->Year));
    assert_param(IS_RTC_MONTH(sDate->Month));
    assert_param(IS_RTC_DATE(sDate->Date));

    datetmpreg = (((uint32_t)RTC_ByteToBcd2(sDate->Year)  << RTC_DR_YU_Pos) | \
                  ((uint32_t)RTC_ByteToBcd2(sDate->Month) << RTC_DR_MU_Pos) | \
                  ((uint32_t)RTC_ByteToBcd2(sDate->Date))                   | \
                  ((uint32_t)sDate->WeekDay               << RTC_DR_WDU_Pos));
  }
  else
  {
    assert_param(IS_RTC_YEAR(RTC_Bcd2ToByte(sDate->Year)));
    assert_param(IS_RTC_MONTH(RTC_Bcd2ToByte(sDate->Month)));
    assert_param(IS_RTC_DATE(RTC_Bcd2ToByte(sDate->Date)));

    datetmpreg = ((((uint32_t)sDate->Year)    << RTC_DR_YU_Pos) | \
                  (((uint32_t)sDate->Month)   << RTC_DR_MU_Pos) | \
                  ((uint32_t) sDate->Date)                      | \
                  (((uint32_t)sDate->WeekDay) << RTC_DR_WDU_Pos));
  }

  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

  /* Enter Initialization mode */
  status = RTC_EnterInitMode(hrtc);

  if (status == HAL_OK)
  {
    /* Set the RTC_DR register */
    hrtc->Instance->DR = (uint32_t)(datetmpreg & RTC_DR_RESERVED_MASK);

    /* Exit Initialization mode */
    status = RTC_ExitInitMode(hrtc);
  }

  if (status == HAL_OK)
  {
    hrtc->State = HAL_RTC_STATE_READY;
  }

  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

  /* Process Unlocked */
  __HAL_UNLOCK(hrtc);

  return status;
}

/**
  * @brief  Gets RTC current date.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  sDate Pointer to Date structure
  * @param  Format Specifies the format of the entered parameters.
  *          This parameter can be one of the following values:
  *            @arg RTC_FORMAT_BIN:  Binary data format
  *            @arg RTC_FORMAT_BCD:  BCD data format
  * @note  You must call HAL_RTC_GetDate() after HAL_RTC_GetTime() to unlock the
  *        values in the higher-order calendar shadow registers to ensure
  *        consistency between the time and date values.
  *        Reading RTC current time locks the values in calendar shadow registers
  *        until current date is read to ensure consistency between the time and
  *        date values.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_GetDate(RTC_HandleTypeDef *hrtc, RTC_DateTypeDef *sDate, uint32_t Format)
{
  uint32_t datetmpreg = 0U;

  /* Check the parameters */
  assert_param(IS_RTC_FORMAT(Format));

  /* Get the DR register */
  datetmpreg = (uint32_t)(hrtc->Instance->DR & RTC_DR_RESERVED_MASK);

  /* Fill the structure fields with the read parameters */
  sDate->Year    = (uint8_t)((datetmpreg & (RTC_DR_YT | RTC_DR_YU)) >> RTC_DR_YU_Pos);
  sDate->Month   = (uint8_t)((datetmpreg & (RTC_DR_MT | RTC_DR_MU)) >> RTC_DR_MU_Pos);
  sDate->Date    = (uint8_t) (datetmpreg & (RTC_DR_DT | RTC_DR_DU));
  sDate->WeekDay = (uint8_t)((datetmpreg & (RTC_DR_WDU))            >> RTC_DR_WDU_Pos);

  /* Check the input parameters format */
  if (Format == RTC_FORMAT_BIN)
  {
    /* Convert the date structure parameters to Binary format */
    sDate->Year  = (uint8_t)RTC_Bcd2ToByte(sDate->Year);
    sDate->Month = (uint8_t)RTC_Bcd2ToByte(sDate->Month);
    sDate->Date  = (uint8_t)RTC_Bcd2ToByte(sDate->Date);
  }
  return HAL_OK;
}

/**
  * @}
  */

/** @defgroup RTC_Exported_Functions_Group3 RTC Alarm functions
  * @brief    RTC Alarm functions
  *
@verbatim
 ===============================================================================
                 ##### RTC Alarm functions #####
 ===============================================================================

 [..] This section provides functions allowing to configure Alarm feature

@endverbatim
  * @{
  */
/**
  * @brief  Sets the specified RTC Alarm.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  sAlarm Pointer to Alarm structure
  * @param  Format Specifies the format of the entered parameters.
  *          This parameter can be one of the following values:
  *             @arg RTC_FORMAT_BIN: Binary data format
  *             @arg RTC_FORMAT_BCD: BCD data format
  * @note   The Alarm register can only be written when the corresponding Alarm
  *         is disabled (Use the HAL_RTC_DeactivateAlarm()).
  * @note   The HAL_RTC_SetTime() must be called before enabling the Alarm feature.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_SetAlarm(RTC_HandleTypeDef *hrtc, RTC_AlarmTypeDef *sAlarm, uint32_t Format)
{
  uint32_t tickstart = 0U;
  uint32_t tmpreg = 0U;
  uint32_t subsecondtmpreg = 0U;

  /* Check the parameters */
  assert_param(IS_RTC_FORMAT(Format));
  assert_param(IS_RTC_ALARM(sAlarm->Alarm));
  assert_param(IS_RTC_ALARM_MASK(sAlarm->AlarmMask));
  assert_param(IS_RTC_ALARM_DATE_WEEKDAY_SEL(sAlarm->AlarmDateWeekDaySel));
  assert_param(IS_RTC_ALARM_SUB_SECOND_VALUE(sAlarm->AlarmTime.SubSeconds));
  assert_param(IS_RTC_ALARM_SUB_SECOND_MASK(sAlarm->AlarmSubSecondMask));

  /* Process Locked */
  __HAL_LOCK(hrtc);

  /* Change RTC state to BUSY */
  hrtc->State = HAL_RTC_STATE_BUSY;

  /* Check the data format (binary or BCD) and store the Alarm time and date
     configuration accordingly */
  if (Format == RTC_FORMAT_BIN)
  {
    if ((hrtc->Instance->CR & RTC_CR_FMT) != 0U)
    {
      assert_param(IS_RTC_HOUR12(sAlarm->AlarmTime.Hours));
      assert_param(IS_RTC_HOURFORMAT12(sAlarm->AlarmTime.TimeFormat));
    }
    else
    {
      sAlarm->AlarmTime.TimeFormat = 0x00U;
      assert_param(IS_RTC_HOUR24(sAlarm->AlarmTime.Hours));
    }
    assert_param(IS_RTC_MINUTES(sAlarm->AlarmTime.Minutes));
    assert_param(IS_RTC_SECONDS(sAlarm->AlarmTime.Seconds));

    if (sAlarm->AlarmDateWeekDaySel == RTC_ALARMDATEWEEKDAYSEL_DATE)
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_DATE(sAlarm->AlarmDateWeekDay));
    }
    else
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_WEEKDAY(sAlarm->AlarmDateWeekDay));
    }

    tmpreg = (((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmTime.Hours)   << RTC_ALRMAR_HU_Pos)  | \
              ((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmTime.Minutes) << RTC_ALRMAR_MNU_Pos) | \
              ((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmTime.Seconds))                       | \
              ((uint32_t)(sAlarm->AlarmTime.TimeFormat)            << RTC_TR_PM_Pos)      | \
              ((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmDateWeekDay)  << RTC_ALRMAR_DU_Pos)  | \
              ((uint32_t)sAlarm->AlarmDateWeekDaySel)                                     | \
              ((uint32_t)sAlarm->AlarmMask));
  }
  else
  {
    if ((hrtc->Instance->CR & RTC_CR_FMT) != 0U)
    {
      assert_param(IS_RTC_HOUR12(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)));
      assert_param(IS_RTC_HOURFORMAT12(sAlarm->AlarmTime.TimeFormat));
    }
    else
    {
      sAlarm->AlarmTime.TimeFormat = 0x00U;
      assert_param(IS_RTC_HOUR24(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)));
    }

    assert_param(IS_RTC_MINUTES(RTC_Bcd2ToByte(sAlarm->AlarmTime.Minutes)));
    assert_param(IS_RTC_SECONDS(RTC_Bcd2ToByte(sAlarm->AlarmTime.Seconds)));

    if (sAlarm->AlarmDateWeekDaySel == RTC_ALARMDATEWEEKDAYSEL_DATE)
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_DATE(RTC_Bcd2ToByte(sAlarm->AlarmDateWeekDay)));
    }
    else
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_WEEKDAY(RTC_Bcd2ToByte(sAlarm->AlarmDateWeekDay)));
    }

    tmpreg = (((uint32_t)(sAlarm->AlarmTime.Hours)      << RTC_ALRMAR_HU_Pos)  | \
              ((uint32_t)(sAlarm->AlarmTime.Minutes)    << RTC_ALRMAR_MNU_Pos) | \
              ((uint32_t) sAlarm->AlarmTime.Seconds)                           | \
              ((uint32_t)(sAlarm->AlarmTime.TimeFormat) << RTC_TR_PM_Pos)      | \
              ((uint32_t)(sAlarm->AlarmDateWeekDay)     << RTC_ALRMAR_DU_Pos)  | \
              ((uint32_t) sAlarm->AlarmDateWeekDaySel)                         | \
              ((uint32_t) sAlarm->AlarmMask));
  }

  /* Store the Alarm subseconds configuration */
  subsecondtmpreg = (uint32_t)((uint32_t)(sAlarm->AlarmTime.SubSeconds) | \
                               (uint32_t)(sAlarm->AlarmSubSecondMask));

  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

  /* Configure the Alarm register */
  if (sAlarm->Alarm == RTC_ALARM_A)
  {
    /* Disable the Alarm A */
    __HAL_RTC_ALARMA_DISABLE(hrtc);

    /* In case interrupt mode is used, the interrupt source must be disabled */
    __HAL_RTC_ALARM_DISABLE_IT(hrtc, RTC_IT_ALRA);

    /* Clear the Alarm flag */
    __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF);

    /* Get tick */
    tickstart = HAL_GetTick();

    /* Wait till RTC ALRAWF flag is set and if timeout is reached exit */
    while (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAWF) == 0U)
    {
      if ((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
      {
        /* Enable the write protection for RTC registers */
        __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

        hrtc->State = HAL_RTC_STATE_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hrtc);

        return HAL_TIMEOUT;
      }
    }

    hrtc->Instance->ALRMAR = (uint32_t)tmpreg;
    /* Configure the Alarm A Subseconds register */
    hrtc->Instance->ALRMASSR = subsecondtmpreg;
    /* Configure the Alarm state: Enable Alarm */
    __HAL_RTC_ALARMA_ENABLE(hrtc);
  }
  else
  {
    /* Disable the Alarm B */
    __HAL_RTC_ALARMB_DISABLE(hrtc);

    /* In case interrupt mode is used, the interrupt source must be disabled */
    __HAL_RTC_ALARM_DISABLE_IT(hrtc, RTC_IT_ALRB);

    /* Clear the Alarm flag */
    __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRBF);

    /* Get tick */
    tickstart = HAL_GetTick();

    /* Wait till RTC ALRBWF flag is set and if timeout is reached exit */
    while (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRBWF) == 0U)
    {
      if ((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
      {
        /* Enable the write protection for RTC registers */
        __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

        hrtc->State = HAL_RTC_STATE_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hrtc);

        return HAL_TIMEOUT;
      }
    }

    hrtc->Instance->ALRMBR = (uint32_t)tmpreg;
    /* Configure the Alarm B Subseconds register */
    hrtc->Instance->ALRMBSSR = subsecondtmpreg;
    /* Configure the Alarm state: Enable Alarm */
    __HAL_RTC_ALARMB_ENABLE(hrtc);
  }

  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

  /* Change RTC state back to READY */
  hrtc->State = HAL_RTC_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hrtc);

  return HAL_OK;
}

/**
  * @brief  Sets the specified RTC Alarm with Interrupt.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  sAlarm Pointer to Alarm structure
  * @param  Format Specifies the format of the entered parameters.
  *          This parameter can be one of the following values:
  *             @arg RTC_FORMAT_BIN: Binary data format
  *             @arg RTC_FORMAT_BCD: BCD data format
  * @note   The Alarm register can only be written when the corresponding Alarm
  *         is disabled (Use the HAL_RTC_DeactivateAlarm()).
  * @note   The HAL_RTC_SetTime() must be called before enabling the Alarm feature.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_SetAlarm_IT(RTC_HandleTypeDef *hrtc, RTC_AlarmTypeDef *sAlarm, uint32_t Format)
{
  __IO uint32_t count  = RTC_TIMEOUT_VALUE * (SystemCoreClock / 32U / 1000U);
       uint32_t tmpreg = 0U;
       uint32_t subsecondtmpreg = 0U;

  /* Check the parameters */
  assert_param(IS_RTC_FORMAT(Format));
  assert_param(IS_RTC_ALARM(sAlarm->Alarm));
  assert_param(IS_RTC_ALARM_MASK(sAlarm->AlarmMask));
  assert_param(IS_RTC_ALARM_DATE_WEEKDAY_SEL(sAlarm->AlarmDateWeekDaySel));
  assert_param(IS_RTC_ALARM_SUB_SECOND_VALUE(sAlarm->AlarmTime.SubSeconds));
  assert_param(IS_RTC_ALARM_SUB_SECOND_MASK(sAlarm->AlarmSubSecondMask));

  /* Process Locked */
  __HAL_LOCK(hrtc);

  /* Change RTC state to BUSY */
  hrtc->State = HAL_RTC_STATE_BUSY;

  /* Check the data format (binary or BCD) and store the Alarm time and date
     configuration accordingly */
  if (Format == RTC_FORMAT_BIN)
  {
    if ((hrtc->Instance->CR & RTC_CR_FMT) != 0U)
    {
      assert_param(IS_RTC_HOUR12(sAlarm->AlarmTime.Hours));
      assert_param(IS_RTC_HOURFORMAT12(sAlarm->AlarmTime.TimeFormat));
    }
    else
    {
      sAlarm->AlarmTime.TimeFormat = 0x00U;
      assert_param(IS_RTC_HOUR24(sAlarm->AlarmTime.Hours));
    }
    assert_param(IS_RTC_MINUTES(sAlarm->AlarmTime.Minutes));
    assert_param(IS_RTC_SECONDS(sAlarm->AlarmTime.Seconds));

    if (sAlarm->AlarmDateWeekDaySel == RTC_ALARMDATEWEEKDAYSEL_DATE)
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_DATE(sAlarm->AlarmDateWeekDay));
    }
    else
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_WEEKDAY(sAlarm->AlarmDateWeekDay));
    }

    tmpreg = (((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmTime.Hours)   << RTC_ALRMAR_HU_Pos)  | \
              ((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmTime.Minutes) << RTC_ALRMAR_MNU_Pos) | \
              ((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmTime.Seconds))                       | \
              ((uint32_t)(sAlarm->AlarmTime.TimeFormat)            << RTC_TR_PM_Pos)      | \
              ((uint32_t)RTC_ByteToBcd2(sAlarm->AlarmDateWeekDay)  << RTC_ALRMAR_DU_Pos)  | \
              ((uint32_t)sAlarm->AlarmDateWeekDaySel)                                     | \
              ((uint32_t)sAlarm->AlarmMask));
  }
  else
  {
    if ((hrtc->Instance->CR & RTC_CR_FMT) != 0U)
    {
      assert_param(IS_RTC_HOUR12(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)));
      assert_param(IS_RTC_HOURFORMAT12(sAlarm->AlarmTime.TimeFormat));
    }
    else
    {
      sAlarm->AlarmTime.TimeFormat = 0x00U;
      assert_param(IS_RTC_HOUR24(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)));
    }

    assert_param(IS_RTC_MINUTES(RTC_Bcd2ToByte(sAlarm->AlarmTime.Minutes)));
    assert_param(IS_RTC_SECONDS(RTC_Bcd2ToByte(sAlarm->AlarmTime.Seconds)));

    if (sAlarm->AlarmDateWeekDaySel == RTC_ALARMDATEWEEKDAYSEL_DATE)
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_DATE(RTC_Bcd2ToByte(sAlarm->AlarmDateWeekDay)));
    }
    else
    {
      assert_param(IS_RTC_ALARM_DATE_WEEKDAY_WEEKDAY(RTC_Bcd2ToByte(sAlarm->AlarmDateWeekDay)));
    }

    tmpreg = (((uint32_t)(sAlarm->AlarmTime.Hours)      << RTC_ALRMAR_HU_Pos)  | \
              ((uint32_t)(sAlarm->AlarmTime.Minutes)    << RTC_ALRMAR_MNU_Pos) | \
              ((uint32_t) sAlarm->AlarmTime.Seconds)                           | \
              ((uint32_t)(sAlarm->AlarmTime.TimeFormat) << RTC_TR_PM_Pos)      | \
              ((uint32_t)(sAlarm->AlarmDateWeekDay)     << RTC_ALRMAR_DU_Pos)  | \
              ((uint32_t) sAlarm->AlarmDateWeekDaySel)                         | \
              ((uint32_t) sAlarm->AlarmMask));
  }

  /* Store the Alarm subseconds configuration */
  subsecondtmpreg = (uint32_t)((uint32_t)(sAlarm->AlarmTime.SubSeconds) | \
                               (uint32_t)(sAlarm->AlarmSubSecondMask));

  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

  /* Configure the Alarm register */
  if (sAlarm->Alarm == RTC_ALARM_A)
  {
    /* Disable the Alarm A */
    __HAL_RTC_ALARMA_DISABLE(hrtc);

    /* Clear the Alarm flag */
    __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF);

    /* Wait till RTC ALRAWF flag is set and if timeout is reached exit */
    do
    {
      count = count - 1U;
      if (count == 0U)
      {
        /* Enable the write protection for RTC registers */
        __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

        hrtc->State = HAL_RTC_STATE_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hrtc);

        return HAL_TIMEOUT;
      }
    } while (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAWF) == 0U);

    hrtc->Instance->ALRMAR = (uint32_t)tmpreg;
    /* Configure the Alarm A Subseconds register */
    hrtc->Instance->ALRMASSR = subsecondtmpreg;
    /* Configure the Alarm state: Enable Alarm */
    __HAL_RTC_ALARMA_ENABLE(hrtc);
    /* Configure the Alarm interrupt */
    __HAL_RTC_ALARM_ENABLE_IT(hrtc, RTC_IT_ALRA);
  }
  else
  {
    /* Disable the Alarm B */
    __HAL_RTC_ALARMB_DISABLE(hrtc);

    /* Clear the Alarm flag */
    __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRBF);

    /* Reload the counter */
    count = RTC_TIMEOUT_VALUE * (SystemCoreClock / 32U / 1000U);

    /* Wait till RTC ALRBWF flag is set and if timeout is reached exit */
    do
    {
      count = count - 1U;
      if (count == 0U)
      {
        /* Enable the write protection for RTC registers */
        __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

        hrtc->State = HAL_RTC_STATE_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hrtc);

        return HAL_TIMEOUT;
      }
    } while (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRBWF) == 0U);

    hrtc->Instance->ALRMBR = (uint32_t)tmpreg;
    /* Configure the Alarm B Subseconds register */
    hrtc->Instance->ALRMBSSR = subsecondtmpreg;
    /* Configure the Alarm state: Enable Alarm */
    __HAL_RTC_ALARMB_ENABLE(hrtc);
    /* Configure the Alarm interrupt */
    __HAL_RTC_ALARM_ENABLE_IT(hrtc, RTC_IT_ALRB);
  }

  /* RTC Alarm Interrupt Configuration: EXTI configuration */
  __HAL_RTC_ALARM_EXTI_ENABLE_IT();
  __HAL_RTC_ALARM_EXTI_ENABLE_RISING_EDGE();

  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

  /* Change RTC state back to READY */
  hrtc->State = HAL_RTC_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hrtc);

  return HAL_OK;
}

/**
  * @brief  Deactivates the specified RTC Alarm.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  Alarm Specifies the Alarm.
  *          This parameter can be one of the following values:
  *            @arg RTC_ALARM_A: Alarm A
  *            @arg RTC_ALARM_B: Alarm B
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_DeactivateAlarm(RTC_HandleTypeDef *hrtc, uint32_t Alarm)
{
  uint32_t tickstart = 0U;

  /* Check the parameters */
  assert_param(IS_RTC_ALARM(Alarm));

  /* Process Locked */
  __HAL_LOCK(hrtc);

  hrtc->State = HAL_RTC_STATE_BUSY;

  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);

  if (Alarm == RTC_ALARM_A)
  {
    /* Disable Alarm A */
    __HAL_RTC_ALARMA_DISABLE(hrtc);

    /* In case interrupt mode is used, the interrupt source must be disabled */
    __HAL_RTC_ALARM_DISABLE_IT(hrtc, RTC_IT_ALRA);

    /* Get tick */
    tickstart = HAL_GetTick();

    /* Wait till RTC ALRxWF flag is set and if timeout is reached exit */
    while (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAWF) == 0U)
    {
      if ((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
      {
        /* Enable the write protection for RTC registers */
        __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

        hrtc->State = HAL_RTC_STATE_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hrtc);

        return HAL_TIMEOUT;
      }
    }
  }
  else
  {
    /* Disable Alarm B */
    __HAL_RTC_ALARMB_DISABLE(hrtc);

    /* In case interrupt mode is used, the interrupt source must be disabled */
    __HAL_RTC_ALARM_DISABLE_IT(hrtc, RTC_IT_ALRB);

    /* Get tick */
    tickstart = HAL_GetTick();

    /* Wait till RTC ALRxWF flag is set and if timeout is reached exit */
    while (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRBWF) == 0U)
    {
      if ((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
      {
        /* Enable the write protection for RTC registers */
        __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

        hrtc->State = HAL_RTC_STATE_TIMEOUT;

        /* Process Unlocked */
        __HAL_UNLOCK(hrtc);

        return HAL_TIMEOUT;
      }
    }
  }

  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);

  hrtc->State = HAL_RTC_STATE_READY;

  /* Process Unlocked */
  __HAL_UNLOCK(hrtc);

  return HAL_OK;
}

/**
  * @brief  Gets the RTC Alarm value and masks.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  sAlarm Pointer to Date structure
  * @param  Alarm Specifies the Alarm.
  *          This parameter can be one of the following values:
  *            @arg RTC_ALARM_A: Alarm A
  *            @arg RTC_ALARM_B: Alarm B
  * @param  Format Specifies the format of the entered parameters.
  *          This parameter can be one of the following values:
  *             @arg RTC_FORMAT_BIN: Binary data format
  *             @arg RTC_FORMAT_BCD: BCD data format
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_GetAlarm(RTC_HandleTypeDef *hrtc, RTC_AlarmTypeDef *sAlarm, uint32_t Alarm, uint32_t Format)
{
  uint32_t tmpreg = 0U;
  uint32_t subsecondtmpreg = 0U;

  /* Check the parameters */
  assert_param(IS_RTC_FORMAT(Format));
  assert_param(IS_RTC_ALARM(Alarm));

  if (Alarm == RTC_ALARM_A)
  {
    sAlarm->Alarm = RTC_ALARM_A;

    tmpreg = (uint32_t)(hrtc->Instance->ALRMAR);
    subsecondtmpreg = (uint32_t)((hrtc->Instance->ALRMASSR) & RTC_ALRMASSR_SS);
  }
  else
  {
    sAlarm->Alarm = RTC_ALARM_B;

    tmpreg = (uint32_t)(hrtc->Instance->ALRMBR);
    subsecondtmpreg = (uint32_t)((hrtc->Instance->ALRMBSSR) & RTC_ALRMBSSR_SS);
  }

  /* Fill the structure with the read parameters */
  sAlarm->AlarmTime.Hours      = (uint8_t) ((tmpreg & (RTC_ALRMAR_HT  | RTC_ALRMAR_HU))  >> RTC_ALRMAR_HU_Pos);
  sAlarm->AlarmTime.Minutes    = (uint8_t) ((tmpreg & (RTC_ALRMAR_MNT | RTC_ALRMAR_MNU)) >> RTC_ALRMAR_MNU_Pos);
  sAlarm->AlarmTime.Seconds    = (uint8_t) ( tmpreg & (RTC_ALRMAR_ST  | RTC_ALRMAR_SU));
  sAlarm->AlarmTime.TimeFormat = (uint8_t) ((tmpreg & RTC_ALRMAR_PM)                     >> RTC_TR_PM_Pos);
  sAlarm->AlarmTime.SubSeconds = (uint32_t) subsecondtmpreg;
  sAlarm->AlarmDateWeekDay     = (uint8_t) ((tmpreg & (RTC_ALRMAR_DT  | RTC_ALRMAR_DU))  >> RTC_ALRMAR_DU_Pos);
  sAlarm->AlarmDateWeekDaySel  = (uint32_t) (tmpreg & RTC_ALRMAR_WDSEL);
  sAlarm->AlarmMask            = (uint32_t) (tmpreg & RTC_ALARMMASK_ALL);

  if (Format == RTC_FORMAT_BIN)
  {
    sAlarm->AlarmTime.Hours   = RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours);
    sAlarm->AlarmTime.Minutes = RTC_Bcd2ToByte(sAlarm->AlarmTime.Minutes);
    sAlarm->AlarmTime.Seconds = RTC_Bcd2ToByte(sAlarm->AlarmTime.Seconds);
    sAlarm->AlarmDateWeekDay  = RTC_Bcd2ToByte(sAlarm->AlarmDateWeekDay);
  }

  return HAL_OK;
}

/**
  * @brief  Handles Alarm interrupt request.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
void HAL_RTC_AlarmIRQHandler(RTC_HandleTypeDef *hrtc)
{
  /* Clear the EXTI's line Flag for RTC Alarm */
  __HAL_RTC_ALARM_EXTI_CLEAR_FLAG();

  /* Get the Alarm A interrupt source enable status */
  if (__HAL_RTC_ALARM_GET_IT_SOURCE(hrtc, RTC_IT_ALRA) != 0U)
  {
    /* Get the pending status of the Alarm A Interrupt */
    if (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAF) != 0U)
    {
      /* Clear the Alarm A interrupt pending bit */
      __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF);

      /* Alarm A callback */
#if (USE_HAL_RTC_REGISTER_CALLBACKS == 1)
      hrtc->AlarmAEventCallback(hrtc);
#else
      HAL_RTC_AlarmAEventCallback(hrtc);
#endif /* USE_HAL_RTC_REGISTER_CALLBACKS */
    }
  }

  /* Get the Alarm B interrupt source enable status */
  if (__HAL_RTC_ALARM_GET_IT_SOURCE(hrtc, RTC_IT_ALRB) != 0U)
  {
    /* Get the pending status of the Alarm B Interrupt */
    if (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRBF) != 0U)
    {
      /* Clear the Alarm B interrupt pending bit */
      __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRBF);

      /* Alarm B callback */
#if (USE_HAL_RTC_REGISTER_CALLBACKS == 1)
      hrtc->AlarmBEventCallback(hrtc);
#else
      HAL_RTCEx_AlarmBEventCallback(hrtc);
#endif /* USE_HAL_RTC_REGISTER_CALLBACKS */
    }
  }

  /* Change RTC state */
  hrtc->State = HAL_RTC_STATE_READY;
}

/**
  * @brief  Alarm A callback.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
__weak void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
  /* Prevent unused argument(s) compilation warning */
  UNUSED(hrtc);

  /* NOTE: This function should not be modified, when the callback is needed,
           the HAL_RTC_AlarmAEventCallback could be implemented in the user file
   */
}

/**
  * @brief  Handles Alarm A Polling request.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @param  Timeout Timeout duration
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_PollForAlarmAEvent(RTC_HandleTypeDef *hrtc, uint32_t Timeout)
{
  uint32_t tickstart = 0U;

  /* Get tick */
  tickstart = HAL_GetTick();

  /* Wait till RTC ALRAF flag is set and if timeout is reached exit */
  while (__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAF) == 0U)
  {
    if (Timeout != HAL_MAX_DELAY)
    {
      if ((Timeout == 0U) || ((HAL_GetTick() - tickstart) > Timeout))
      {
        hrtc->State = HAL_RTC_STATE_TIMEOUT;
        return HAL_TIMEOUT;
      }
    }
  }

  /* Clear the Alarm flag */
  __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF);

  /* Change RTC state */
  hrtc->State = HAL_RTC_STATE_READY;

  return HAL_OK;
}

/**
  * @}
  */

/** @defgroup RTC_Exported_Functions_Group4 Peripheral Control functions
  * @brief    Peripheral Control functions
  *
@verbatim
 ===============================================================================
                     ##### Peripheral Control functions #####
 ===============================================================================
    [..]
    This subsection provides functions allowing to
      (+) Wait for RTC Time and Date Synchronization
      (+) Manage RTC Summer or Winter time change

@endverbatim
  * @{
  */

/**
  * @brief  Waits until the RTC Time and Date registers (RTC_TR and RTC_DR) are
  *         synchronized with RTC APB clock.
  * @note   The RTC Resynchronization mode is write protected, use the
  *         __HAL_RTC_WRITEPROTECTION_DISABLE() before calling this function.
  * @note   To read the calendar through the shadow registers after Calendar
  *         initialization, calendar update or after wakeup from low power modes
  *         the software must first clear the RSF flag.
  *         The software must then wait until it is set again before reading
  *         the calendar, which means that the calendar registers have been
  *         correctly copied into the RTC_TR and RTC_DR shadow registers.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval HAL status
  */
HAL_StatusTypeDef HAL_RTC_WaitForSynchro(RTC_HandleTypeDef *hrtc)
{
  uint32_t tickstart = 0U;

  /* Clear RSF flag, keep reserved bits at reset values (setting other flags has no effect) */
  hrtc->Instance->ISR = ((uint32_t)(RTC_RSF_MASK & RTC_ISR_RESERVED_MASK));

  /* Get tick */
  tickstart = HAL_GetTick();

  /* Wait the registers to be synchronised */
  while ((hrtc->Instance->ISR & RTC_ISR_RSF) == 0U)
  {
    if ((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
    {
      return HAL_TIMEOUT;
    }
  }

  return HAL_OK;
}

/**
  * @brief  Daylight Saving Time, adds one hour to the calendar in one
  *         single operation without going through the initialization procedure.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
void HAL_RTC_DST_Add1Hour(RTC_HandleTypeDef *hrtc)
{
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
  SET_BIT(hrtc->Instance->CR, RTC_CR_ADD1H);
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
}

/**
  * @brief  Daylight Saving Time, subtracts one hour from the calendar in one
  *         single operation without going through the initialization procedure.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
void HAL_RTC_DST_Sub1Hour(RTC_HandleTypeDef *hrtc)
{
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
  SET_BIT(hrtc->Instance->CR, RTC_CR_SUB1H);
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
}

/**
  * @brief  Daylight Saving Time, sets the store operation bit.
  * @note   It can be used by the software in order to memorize the DST status.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
void HAL_RTC_DST_SetStoreOperation(RTC_HandleTypeDef *hrtc)
{
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
  SET_BIT(hrtc->Instance->CR, RTC_CR_BKP);
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
}

/**
  * @brief  Daylight Saving Time, clears the store operation bit.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval None
  */
void HAL_RTC_DST_ClearStoreOperation(RTC_HandleTypeDef *hrtc)
{
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
  CLEAR_BIT(hrtc->Instance->CR, RTC_CR_BKP);
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
}

/**
  * @brief  Daylight Saving Time, reads the store operation bit.
  * @param  hrtc RTC handle
  * @retval operation see RTC_StoreOperation_Definitions
  */
uint32_t HAL_RTC_DST_ReadStoreOperation(RTC_HandleTypeDef *hrtc)
{
  return READ_BIT(hrtc->Instance->CR, RTC_CR_BKP);
}

/**
  * @}
  */

/** @defgroup RTC_Exported_Functions_Group5 Peripheral State functions
  * @brief    Peripheral State functions
  *
@verbatim
 ===============================================================================
                     ##### Peripheral State functions #####
 ===============================================================================
    [..]
    This subsection provides functions allowing to
      (+) Get RTC state

@endverbatim
  * @{
  */
/**
  * @brief  Returns the RTC state.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval HAL state
  */
HAL_RTCStateTypeDef HAL_RTC_GetState(RTC_HandleTypeDef *hrtc)
{
  return hrtc->State;
}

/**
  * @}
  */


/**
  * @}
  */

/** @addtogroup RTC_Private_Functions
  * @{
  */

/**
  * @brief  Enters the RTC Initialization mode.
  * @note   The RTC Initialization mode is write protected, use the
  *         __HAL_RTC_WRITEPROTECTION_DISABLE() before calling this function.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval HAL status
  */
HAL_StatusTypeDef RTC_EnterInitMode(RTC_HandleTypeDef *hrtc)
{
  uint32_t tickstart = 0U;
  HAL_StatusTypeDef status = HAL_OK;

  /* Check that Initialization mode is not already set */
  if (READ_BIT(hrtc->Instance->ISR, RTC_ISR_INITF) == 0U)
  {
    /* Set INIT bit to enter Initialization mode */
    SET_BIT(hrtc->Instance->ISR, RTC_ISR_INIT);

    /* Get tick */
    tickstart = HAL_GetTick();

    /* Wait till RTC is in INIT state and if timeout is reached exit */
    while ((READ_BIT(hrtc->Instance->ISR, RTC_ISR_INITF) == 0U) && (status != HAL_ERROR))
    {
      if ((HAL_GetTick() - tickstart) > RTC_TIMEOUT_VALUE)
      {
        /* Set RTC state */
        hrtc->State = HAL_RTC_STATE_ERROR;
        status = HAL_ERROR;
      }
    }
  }

  return status;
}

/**
  * @brief  Exits the RTC Initialization mode.
  * @param  hrtc pointer to a RTC_HandleTypeDef structure that contains
  *                the configuration information for RTC.
  * @retval HAL status
  */
HAL_StatusTypeDef RTC_ExitInitMode(RTC_HandleTypeDef *hrtc)
{
  HAL_StatusTypeDef status = HAL_OK;

  /* Clear INIT bit to exit Initialization mode */
  CLEAR_BIT(hrtc->Instance->ISR, RTC_ISR_INIT);

  /* If CR_BYPSHAD bit = 0, wait for synchro */
  if (READ_BIT(hrtc->Instance->CR, RTC_CR_BYPSHAD) == 0U)
  {
    if (HAL_RTC_WaitForSynchro(hrtc) != HAL_OK)
    {
      /* Set RTC state */
      hrtc->State = HAL_RTC_STATE_ERROR;
      status = HAL_ERROR;
    }
  }

  return status;
}

/**
  * @brief  Converts a 2-digit number from decimal to BCD format.
  * @param  number decimal-formatted number (from 0 to 99) to be converted
  * @retval Converted byte
  */
uint8_t RTC_ByteToBcd2(uint8_t number)
{
  uint32_t bcdhigh = 0U;

  while (number >= 10U)
  {
    bcdhigh++;
    number -= 10U;
  }

  return ((uint8_t)(bcdhigh << 4U) | number);
}

/**
  * @brief  Converts a 2-digit number from BCD to decimal format.
  * @param  number BCD-formatted number (from 00 to 99) to be converted
  * @retval Converted word
  */
uint8_t RTC_Bcd2ToByte(uint8_t number)
{
  uint32_t tens = 0U;
  tens = (((uint32_t)number & 0xF0U) >> 4U) * 10U;
  return (uint8_t)(tens + ((uint32_t)number & 0x0FU));
}

/**
  * @}
  */

#endif /* HAL_RTC_MODULE_ENABLED */
/**
  * @}
  */

/**
  * @}
  */