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  1. /**
  2.   ******************************************************************************
  3.   * @file    stm32f1xx_hal_rtc.c
  4.   * @author  MCD Application Team
  5.   * @version V1.0.4
  6.   * @date    29-April-2016
  7.   * @brief   RTC HAL module driver.
  8.   *          This file provides firmware functions to manage the following
  9.   *          functionalities of the Real Time Clock (RTC) peripheral:
  10.   *           + Initialization and de-initialization functions
  11.   *           + RTC Time and Date functions
  12.   *           + RTC Alarm functions
  13.   *           + Peripheral Control functions  
  14.   *           + Peripheral State functions
  15.   *        
  16.   @verbatim
  17.   ==============================================================================
  18.                   ##### How to use this driver #####
  19.   ==================================================================
  20.   [..]
  21.     (+) Enable the RTC domain access (see description in the section above).
  22.     (+) Configure the RTC Prescaler (Asynchronous prescaler to generate RTC 1Hz time base)
  23.         using the HAL_RTC_Init() function.
  24.  
  25.   *** Time and Date configuration ***
  26.   ===================================
  27.   [..]
  28.     (+) To configure the RTC Calendar (Time and Date) use the HAL_RTC_SetTime()
  29.         and HAL_RTC_SetDate() functions.
  30.     (+) To read the RTC Calendar, use the HAL_RTC_GetTime() and HAL_RTC_GetDate() functions.
  31.  
  32.   *** Alarm configuration ***
  33.   ===========================
  34.   [..]
  35.     (+) To configure the RTC Alarm use the HAL_RTC_SetAlarm() function.
  36.         You can also configure the RTC Alarm with interrupt mode using the HAL_RTC_SetAlarm_IT() function.
  37.     (+) To read the RTC Alarm, use the HAL_RTC_GetAlarm() function.
  38.  
  39.   *** Tamper configuration ***
  40.   ============================
  41.   [..]
  42.     (+) Enable the RTC Tamper and configure the Tamper Level using the
  43.         HAL_RTCEx_SetTamper() function. You can configure RTC Tamper with interrupt
  44.         mode using HAL_RTCEx_SetTamper_IT() function.
  45.     (+) The TAMPER1 alternate function can be mapped to PC13
  46.  
  47.   *** Backup Data Registers configuration ***
  48.   ===========================================
  49.   [..]
  50.     (+) To write to the RTC Backup Data registers, use the HAL_RTCEx_BKUPWrite()
  51.         function.  
  52.     (+) To read the RTC Backup Data registers, use the HAL_RTCEx_BKUPRead()
  53.         function.
  54.      
  55.                   ##### WARNING: Drivers Restrictions  #####
  56.   ==================================================================
  57.   [..] RTC version used on STM32F1 families is version V1. All the features supported by V2
  58.        (other families) will be not supported on F1.
  59.   [..] As on V2, main RTC features are managed by HW. But on F1, date feature is completely
  60.        managed by SW.
  61.   [..] Then, there are some restrictions compared to other families:
  62.     (+) Only format 24 hours supported in HAL (format 12 hours not supported)
  63.     (+) Date is saved in SRAM. Then, when MCU is in STOP or STANDBY mode, date will be lost.
  64.         User should implement a way to save date before entering in low power mode (an
  65.         example is provided with firmware package based on backup registers)
  66.     (+) Date is automatically updated each time a HAL_RTC_GetTime or HAL_RTC_GetDate is called.
  67.     (+) Alarm detection is limited to 1 day. It will expire only 1 time (no alarm repetition, need
  68.         to program a new alarm)
  69.  
  70.               ##### Backup Domain Operating Condition #####
  71.   ==============================================================================
  72.   [..] The real-time clock (RTC) and the RTC backup registers can be powered
  73.        from the VBAT voltage when the main VDD supply is powered off.
  74.        To retain the content of the RTC backup registers and supply the RTC
  75.        when VDD is turned off, VBAT pin can be connected to an optional
  76.        standby voltage supplied by a battery or by another source.
  77.  
  78.   [..] To allow the RTC operating even when the main digital supply (VDD) is turned
  79.        off, the VBAT pin powers the following blocks:
  80.     (+) The RTC
  81.     (+) The LSE oscillator
  82.     (+) PC13 I/O
  83.  
  84.   [..] When the backup domain is supplied by VDD (analog switch connected to VDD),
  85.        the following pins are available:
  86.     (+) PC13 can be used as a Tamper pin
  87.  
  88.   [..] When the backup domain is supplied by VBAT (analog switch connected to VBAT
  89.        because VDD is not present), the following pins are available:
  90.     (+) PC13 can be used as the Tamper pin
  91.              
  92.                    ##### Backup Domain Reset #####
  93.   ==================================================================
  94.   [..] The backup domain reset sets all RTC registers and the RCC_BDCR register
  95.        to their reset values.
  96.   [..] A backup domain reset is generated when one of the following events occurs:
  97.     (#) Software reset, triggered by setting the BDRST bit in the
  98.         RCC Backup domain control register (RCC_BDCR).
  99.     (#) VDD or VBAT power on, if both supplies have previously been powered off.  
  100.     (#) Tamper detection event resets all data backup registers.
  101.  
  102.                    ##### Backup Domain Access #####
  103.   ==================================================================
  104.   [..] After reset, the backup domain (RTC registers, RTC backup data
  105.        registers and backup SRAM) is protected against possible unwanted write
  106.        accesses.
  107.   [..] To enable access to the RTC Domain and RTC registers, proceed as follows:
  108.     (+) Call the function HAL_RCCEx_PeriphCLKConfig in using RCC_PERIPHCLK_RTC for
  109.         PeriphClockSelection and select RTCClockSelection (LSE, LSI or HSE)
  110.     (+) Enable the BKP clock in using __HAL_RCC_BKP_CLK_ENABLE()
  111.  
  112.                   ##### RTC and low power modes #####
  113.   ==================================================================
  114.   [..] The MCU can be woken up from a low power mode by an RTC alternate
  115.        function.
  116.   [..] The RTC alternate functions are the RTC alarms (Alarm A),
  117.        and RTC tamper event detection.
  118.        These RTC alternate functions can wake up the system from the Stop and
  119.        Standby low power modes.
  120.   [..] The system can also wake up from low power modes without depending
  121.        on an external interrupt (Auto-wakeup mode), by using the RTC alarm.
  122.      
  123.    @endverbatim
  124.   ******************************************************************************
  125.   * @attention
  126.   *
  127.   * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
  128.   *
  129.   * Redistribution and use in source and binary forms, with or without modification,
  130.   * are permitted provided that the following conditions are met:
  131.   *   1. Redistributions of source code must retain the above copyright notice,
  132.   *      this list of conditions and the following disclaimer.
  133.   *   2. Redistributions in binary form must reproduce the above copyright notice,
  134.   *      this list of conditions and the following disclaimer in the documentation
  135.   *      and/or other materials provided with the distribution.
  136.   *   3. Neither the name of STMicroelectronics nor the names of its contributors
  137.   *      may be used to endorse or promote products derived from this software
  138.   *      without specific prior written permission.
  139.   *
  140.   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  141.   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  142.   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  143.   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  144.   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  145.   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  146.   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  147.   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  148.   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  149.   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  150.   *
  151.   ******************************************************************************
  152.   */
  153.  
  154. /* Includes ------------------------------------------------------------------*/
  155. #include "stm32f1xx_hal.h"
  156.  
  157. /** @addtogroup STM32F1xx_HAL_Driver
  158.   * @{
  159.   */
  160.  
  161. /** @defgroup RTC RTC
  162.   * @brief RTC HAL module driver
  163.   * @{
  164.   */
  165.  
  166. #ifdef HAL_RTC_MODULE_ENABLED
  167.  
  168. /* Private typedef -----------------------------------------------------------*/
  169. /* Private define ------------------------------------------------------------*/
  170. /** @defgroup RTC_Private_Constants RTC Private Constants
  171.   * @{
  172.   */
  173. #define RTC_ALARM_RESETVALUE_REGISTER    (uint16_t)0xFFFF
  174. #define RTC_ALARM_RESETVALUE             (uint32_t)0xFFFFFFFF
  175.  
  176. /**
  177.   * @}
  178.   */
  179.  
  180. /* Private macro -------------------------------------------------------------*/
  181. /** @defgroup RTC_Private_Macros RTC Private Macros
  182.   * @{
  183.   */
  184. /**
  185.   * @}
  186.   */
  187.  
  188. /* Private variables ---------------------------------------------------------*/
  189. /* Private function prototypes -----------------------------------------------*/
  190. /** @defgroup RTC_Private_Functions RTC Private Functions
  191.   * @{
  192.   */
  193. static uint32_t           RTC_ReadTimeCounter(RTC_HandleTypeDef* hrtc);
  194. static HAL_StatusTypeDef  RTC_WriteTimeCounter(RTC_HandleTypeDef* hrtc, uint32_t TimeCounter);
  195. static uint32_t           RTC_ReadAlarmCounter(RTC_HandleTypeDef* hrtc);
  196. static HAL_StatusTypeDef  RTC_WriteAlarmCounter(RTC_HandleTypeDef* hrtc, uint32_t AlarmCounter);
  197. static HAL_StatusTypeDef  RTC_EnterInitMode(RTC_HandleTypeDef* hrtc);
  198. static HAL_StatusTypeDef  RTC_ExitInitMode(RTC_HandleTypeDef* hrtc);
  199. static uint8_t            RTC_ByteToBcd2(uint8_t Value);
  200. static uint8_t            RTC_Bcd2ToByte(uint8_t Value);
  201. static uint8_t            RTC_IsLeapYear(uint16_t nYear);
  202. static void               RTC_DateUpdate(RTC_HandleTypeDef* hrtc, uint32_t DayElapsed);
  203. static uint8_t            RTC_WeekDayNum(uint32_t nYear, uint8_t nMonth, uint8_t nDay);
  204.  
  205. /**
  206.   * @}
  207.   */
  208.  
  209. /* Private functions ---------------------------------------------------------*/
  210. /** @defgroup RTC_Exported_Functions RTC Exported Functions
  211.   * @{
  212.   */
  213.  
  214. /** @defgroup RTC_Exported_Functions_Group1 Initialization and de-initialization functions
  215.  *  @brief    Initialization and Configuration functions
  216.  *
  217. @verbatim    
  218.  ===============================================================================
  219.               ##### Initialization and de-initialization functions #####
  220.  ===============================================================================
  221.    [..] This section provides functions allowing to initialize and configure the
  222.          RTC Prescaler (Asynchronous), disable RTC registers Write protection,
  223.          enter and exit the RTC initialization mode,
  224.          RTC registers synchronization check and reference clock detection enable.
  225.          (#) The RTC Prescaler should be programmed to generate the RTC 1Hz time base.
  226.          (#) All RTC registers are Write protected. Writing to the RTC registers
  227.              is enabled by setting the CNF bit in the RTC_CRL register.
  228.          (#) To read the calendar after wakeup from low power modes (Standby or Stop)
  229.              the software must first wait for the RSF bit (Register Synchronized Flag)
  230.              in the RTC_CRL register to be set by hardware.
  231.              The HAL_RTC_WaitForSynchro() function implements the above software
  232.              sequence (RSF clear and RSF check).
  233.  
  234. @endverbatim
  235.   * @{
  236.   */
  237.  
  238. /**
  239.   * @brief  Initializes the RTC peripheral
  240.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  241.   *                the configuration information for RTC.
  242.   * @retval HAL status
  243.   */
  244. HAL_StatusTypeDef HAL_RTC_Init(RTC_HandleTypeDef *hrtc)
  245. {
  246.   uint32_t prescaler = 0;
  247.   /* Check input parameters */
  248.   if(hrtc == NULL)
  249.   {
  250.      return HAL_ERROR;
  251.   }
  252.  
  253.   /* Check the parameters */
  254.   assert_param(IS_RTC_ALL_INSTANCE(hrtc->Instance));
  255.   assert_param(IS_RTC_CALIB_OUTPUT(hrtc->Init.OutPut));
  256.   assert_param(IS_RTC_ASYNCH_PREDIV(hrtc->Init.AsynchPrediv));
  257.    
  258.   if(hrtc->State == HAL_RTC_STATE_RESET)
  259.   {
  260.     /* Allocate lock resource and initialize it */
  261.     hrtc->Lock = HAL_UNLOCKED;
  262.    
  263.     /* Initialize RTC MSP */
  264.     HAL_RTC_MspInit(hrtc);
  265.   }
  266.  
  267.   /* Set RTC state */  
  268.   hrtc->State = HAL_RTC_STATE_BUSY;  
  269.        
  270.   /* Waiting for synchro */
  271.   if(HAL_RTC_WaitForSynchro(hrtc) != HAL_OK)
  272.   {
  273.     /* Set RTC state */
  274.     hrtc->State = HAL_RTC_STATE_ERROR;
  275.    
  276.     return HAL_ERROR;
  277.   }
  278.  
  279.   /* Set Initialization mode */
  280.   if(RTC_EnterInitMode(hrtc) != HAL_OK)
  281.   {
  282.     /* Set RTC state */
  283.     hrtc->State = HAL_RTC_STATE_ERROR;
  284.    
  285.     return HAL_ERROR;
  286.   }
  287.   else
  288.   {
  289.     /* Clear Flags Bits */
  290.     CLEAR_BIT(hrtc->Instance->CRL, (RTC_FLAG_OW | RTC_FLAG_ALRAF | RTC_FLAG_SEC));
  291.    
  292.     if(hrtc->Init.OutPut != RTC_OUTPUTSOURCE_NONE)
  293.     {
  294.       /* Disable the selected Tamper pin */
  295.       CLEAR_BIT(BKP->CR, BKP_CR_TPE);
  296.     }
  297.    
  298.     /* Set the signal which will be routed to RTC Tamper pin*/
  299.     MODIFY_REG(BKP->RTCCR, (BKP_RTCCR_CCO | BKP_RTCCR_ASOE | BKP_RTCCR_ASOS), hrtc->Init.OutPut);
  300.  
  301.     if (hrtc->Init.AsynchPrediv != RTC_AUTO_1_SECOND)
  302.     {
  303.       /* RTC Prescaler provided directly by end-user*/
  304.       prescaler = hrtc->Init.AsynchPrediv;
  305.     }
  306.     else
  307.     {
  308.       /* RTC Prescaler will be automatically calculated to get 1 second timebase */
  309.       /* Get the RTCCLK frequency */
  310.       prescaler = HAL_RCCEx_GetPeriphCLKFreq(RCC_PERIPHCLK_RTC);
  311.  
  312.       /* Check that RTC clock is enabled*/
  313.       if (prescaler == 0)
  314.       {
  315.         /* Should not happen. Frequency is not available*/
  316.         hrtc->State = HAL_RTC_STATE_ERROR;
  317.         return HAL_ERROR;
  318.       }
  319.       else
  320.       {
  321.         /* RTC period = RTCCLK/(RTC_PR + 1) */
  322.         prescaler = prescaler - 1;
  323.       }
  324.     }
  325.    
  326.     /* Configure the RTC_PRLH / RTC_PRLL */
  327.     MODIFY_REG(hrtc->Instance->PRLH, RTC_PRLH_PRL, (prescaler >> 16));
  328.     MODIFY_REG(hrtc->Instance->PRLL, RTC_PRLL_PRL, (prescaler & RTC_PRLL_PRL));
  329.      
  330.     /* Wait for synchro */
  331.     if(RTC_ExitInitMode(hrtc) != HAL_OK)
  332.     {      
  333.       hrtc->State = HAL_RTC_STATE_ERROR;
  334.      
  335.       return HAL_ERROR;
  336.     }
  337.    
  338.     /* Initialize date to 1st of January 2000 */
  339.     hrtc->DateToUpdate.Year = 0x00;
  340.     hrtc->DateToUpdate.Month = RTC_MONTH_JANUARY;
  341.     hrtc->DateToUpdate.Date = 0x01;
  342.  
  343.     /* Set RTC state */
  344.     hrtc->State = HAL_RTC_STATE_READY;
  345.    
  346.     return HAL_OK;
  347.   }
  348. }
  349.  
  350. /**
  351.   * @brief  DeInitializes the RTC peripheral
  352.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  353.   *                the configuration information for RTC.
  354.   * @note   This function does not reset the RTC Backup Data registers.  
  355.   * @retval HAL status
  356.   */
  357. HAL_StatusTypeDef HAL_RTC_DeInit(RTC_HandleTypeDef *hrtc)
  358. {
  359.   /* Check input parameters */
  360.   if(hrtc == NULL)
  361.   {
  362.      return HAL_ERROR;
  363.   }
  364.  
  365.   /* Check the parameters */
  366.   assert_param(IS_RTC_ALL_INSTANCE(hrtc->Instance));
  367.  
  368.   /* Set RTC state */
  369.   hrtc->State = HAL_RTC_STATE_BUSY;
  370.  
  371.   /* Set Initialization mode */
  372.   if(RTC_EnterInitMode(hrtc) != HAL_OK)
  373.   {
  374.     /* Set RTC state */
  375.     hrtc->State = HAL_RTC_STATE_ERROR;
  376.    
  377.     /* Release Lock */
  378.     __HAL_UNLOCK(hrtc);
  379.  
  380.     return HAL_ERROR;
  381.   }  
  382.   else
  383.   {
  384.     CLEAR_REG(hrtc->Instance->CNTL);
  385.     CLEAR_REG(hrtc->Instance->CNTH);
  386.     WRITE_REG(hrtc->Instance->PRLL, 0x00008000);
  387.     CLEAR_REG(hrtc->Instance->PRLH);
  388.  
  389.     /* Reset All CRH/CRL bits */
  390.     CLEAR_REG(hrtc->Instance->CRH);
  391.     CLEAR_REG(hrtc->Instance->CRL);
  392.    
  393.     if(RTC_ExitInitMode(hrtc) != HAL_OK)
  394.     {      
  395.       hrtc->State = HAL_RTC_STATE_ERROR;
  396.      
  397.       /* Process Unlocked */
  398.       __HAL_UNLOCK(hrtc);
  399.      
  400.       return HAL_ERROR;
  401.     }
  402.   }
  403.  
  404.   /* Wait for synchro*/
  405.   HAL_RTC_WaitForSynchro(hrtc);
  406.  
  407.   /* Clear RSF flag */
  408.   CLEAR_BIT(hrtc->Instance->CRL, RTC_FLAG_RSF);
  409.    
  410.   /* De-Initialize RTC MSP */
  411.   HAL_RTC_MspDeInit(hrtc);
  412.  
  413.   hrtc->State = HAL_RTC_STATE_RESET;
  414.  
  415.   /* Release Lock */
  416.   __HAL_UNLOCK(hrtc);
  417.  
  418.   return HAL_OK;
  419. }
  420.  
  421. /**
  422.   * @brief  Initializes the RTC MSP.
  423.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  424.   *                the configuration information for RTC.  
  425.   * @retval None
  426.   */
  427. __weak void HAL_RTC_MspInit(RTC_HandleTypeDef* hrtc)
  428. {
  429.   /* Prevent unused argument(s) compilation warning */
  430.   UNUSED(hrtc);
  431.   /* NOTE : This function Should not be modified, when the callback is needed,
  432.             the HAL_RTC_MspInit could be implemented in the user file
  433.    */
  434. }
  435.  
  436. /**
  437.   * @brief  DeInitializes the RTC MSP.
  438.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  439.   *                the configuration information for RTC.
  440.   * @retval None
  441.   */
  442. __weak void HAL_RTC_MspDeInit(RTC_HandleTypeDef* hrtc)
  443. {
  444.   /* Prevent unused argument(s) compilation warning */
  445.   UNUSED(hrtc);
  446.   /* NOTE : This function Should not be modified, when the callback is needed,
  447.             the HAL_RTC_MspDeInit could be implemented in the user file
  448.    */
  449. }
  450.  
  451. /**
  452.   * @}
  453.   */
  454.  
  455. /** @defgroup RTC_Exported_Functions_Group2 Time and Date functions
  456.  *  @brief   RTC Time and Date functions
  457.  *
  458. @verbatim  
  459.  ===============================================================================
  460.                  ##### RTC Time and Date functions #####
  461.  ===============================================================================  
  462.  
  463.  [..] This section provides functions allowing to configure Time and Date features
  464.  
  465. @endverbatim
  466.   * @{
  467.   */
  468.  
  469. /**
  470.   * @brief  Sets RTC current time.
  471.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  472.   *                the configuration information for RTC.
  473.   * @param  sTime: Pointer to Time structure
  474.   * @param  Format: Specifies the format of the entered parameters.
  475.   *          This parameter can be one of the following values:
  476.   *            @arg RTC_FORMAT_BIN: Binary data format
  477.   *            @arg RTC_FORMAT_BCD: BCD data format
  478.   * @retval HAL status
  479.   */
  480. HAL_StatusTypeDef HAL_RTC_SetTime(RTC_HandleTypeDef *hrtc, RTC_TimeTypeDef *sTime, uint32_t Format)
  481. {
  482.   uint32_t counter_time = 0, counter_alarm = 0;
  483.  
  484.   /* Check input parameters */
  485.   if((hrtc == NULL) || (sTime == NULL))
  486.   {
  487.      return HAL_ERROR;
  488.   }
  489.  
  490.  /* Check the parameters */
  491.   assert_param(IS_RTC_FORMAT(Format));
  492.  
  493.   /* Process Locked */
  494.   __HAL_LOCK(hrtc);
  495.  
  496.   hrtc->State = HAL_RTC_STATE_BUSY;
  497.  
  498.   if(Format == RTC_FORMAT_BIN)
  499.   {
  500.     assert_param(IS_RTC_HOUR24(sTime->Hours));
  501.     assert_param(IS_RTC_MINUTES(sTime->Minutes));
  502.     assert_param(IS_RTC_SECONDS(sTime->Seconds));
  503.  
  504.     counter_time = (uint32_t)(((uint32_t)sTime->Hours * 3600) + \
  505.                         ((uint32_t)sTime->Minutes * 60) + \
  506.                         ((uint32_t)sTime->Seconds));  
  507.   }
  508.   else
  509.   {
  510.     assert_param(IS_RTC_HOUR24(RTC_Bcd2ToByte(sTime->Hours)));
  511.     assert_param(IS_RTC_MINUTES(RTC_Bcd2ToByte(sTime->Minutes)));
  512.     assert_param(IS_RTC_SECONDS(RTC_Bcd2ToByte(sTime->Seconds)));
  513.  
  514.     counter_time = (((uint32_t)(RTC_Bcd2ToByte(sTime->Hours)) * 3600) + \
  515.               ((uint32_t)(RTC_Bcd2ToByte(sTime->Minutes)) * 60) + \
  516.               ((uint32_t)(RTC_Bcd2ToByte(sTime->Seconds))));  
  517.   }
  518.  
  519.   /* Write time counter in RTC registers */
  520.   if (RTC_WriteTimeCounter(hrtc, counter_time) != HAL_OK)
  521.   {
  522.     /* Set RTC state */
  523.     hrtc->State = HAL_RTC_STATE_ERROR;
  524.    
  525.     /* Process Unlocked */
  526.     __HAL_UNLOCK(hrtc);
  527.    
  528.     return HAL_ERROR;
  529.   }
  530.   else
  531.   {
  532.     /* Clear Second and overflow flags */
  533.     CLEAR_BIT(hrtc->Instance->CRL, (RTC_FLAG_SEC | RTC_FLAG_OW));
  534.    
  535.     /* Read current Alarm counter in RTC registers */
  536.     counter_alarm = RTC_ReadAlarmCounter(hrtc);
  537.  
  538.     /* Set again alarm to match with new time if enabled */
  539.     if (counter_alarm != RTC_ALARM_RESETVALUE)
  540.     {
  541.       if(counter_alarm < counter_time)
  542.       {
  543.         /* Add 1 day to alarm counter*/
  544.         counter_alarm += (uint32_t)(24 * 3600);
  545.        
  546.         /* Write new Alarm counter in RTC registers */
  547.         if (RTC_WriteAlarmCounter(hrtc, counter_alarm) != HAL_OK)
  548.         {
  549.           /* Set RTC state */
  550.           hrtc->State = HAL_RTC_STATE_ERROR;
  551.          
  552.           /* Process Unlocked */
  553.           __HAL_UNLOCK(hrtc);
  554.          
  555.           return HAL_ERROR;
  556.         }
  557.       }
  558.     }
  559.    
  560.     hrtc->State = HAL_RTC_STATE_READY;
  561.  
  562.    __HAL_UNLOCK(hrtc);
  563.      
  564.    return HAL_OK;
  565.   }
  566. }
  567.  
  568. /**
  569.   * @brief  Gets RTC current time.
  570.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  571.   *                the configuration information for RTC.
  572.   * @param  sTime: Pointer to Time structure
  573.   * @param  Format: Specifies the format of the entered parameters.
  574.   *          This parameter can be one of the following values:
  575.   *            @arg RTC_FORMAT_BIN: Binary data format
  576.   *            @arg RTC_FORMAT_BCD: BCD data format
  577.   * @retval HAL status
  578.   */
  579. HAL_StatusTypeDef HAL_RTC_GetTime(RTC_HandleTypeDef *hrtc, RTC_TimeTypeDef *sTime, uint32_t Format)
  580. {
  581.   uint32_t counter_time = 0, counter_alarm = 0, days_elapsed = 0, hours = 0;
  582.  
  583.   /* Check input parameters */
  584.   if((hrtc == NULL) || (sTime == NULL))
  585.   {
  586.      return HAL_ERROR;
  587.   }
  588.  
  589.   /* Check the parameters */
  590.   assert_param(IS_RTC_FORMAT(Format));
  591.  
  592.   /* Check if counter overflow occurred */
  593.   if (__HAL_RTC_OVERFLOW_GET_FLAG(hrtc, RTC_FLAG_OW))
  594.   {
  595.       return HAL_ERROR;
  596.   }
  597.  
  598.   /* Read the time counter*/
  599.   counter_time = RTC_ReadTimeCounter(hrtc);
  600.  
  601.   /* Fill the structure fields with the read parameters */
  602.   hours = counter_time / 3600;
  603.   sTime->Minutes  = (uint8_t)((counter_time % 3600) / 60);
  604.   sTime->Seconds  = (uint8_t)((counter_time % 3600) % 60);
  605.  
  606.   if (hours >= 24)
  607.   {
  608.     /* Get number of days elapsed from last calculation */
  609.     days_elapsed = (hours / 24);
  610.  
  611.     /* Set Hours in RTC_TimeTypeDef structure*/
  612.     sTime->Hours = (hours % 24);    
  613.  
  614.     /* Read Alarm counter in RTC registers */
  615.     counter_alarm = RTC_ReadAlarmCounter(hrtc);
  616.  
  617.     /* Calculate remaining time to reach alarm (only if set and not yet expired)*/
  618.     if ((counter_alarm != RTC_ALARM_RESETVALUE) && (counter_alarm > counter_time))
  619.     {
  620.       counter_alarm -= counter_time;
  621.     }
  622.     else
  623.     {
  624.       /* In case of counter_alarm < counter_time */
  625.       /* Alarm expiration already occurred but alarm not deactivated */
  626.       counter_alarm = RTC_ALARM_RESETVALUE;
  627.     }
  628.  
  629.     /* Set updated time in decreasing counter by number of days elapsed */
  630.     counter_time -= (days_elapsed * 24 * 3600);
  631.    
  632.     /* Write time counter in RTC registers */
  633.     if (RTC_WriteTimeCounter(hrtc, counter_time) != HAL_OK)
  634.     {
  635.       return HAL_ERROR;
  636.     }
  637.  
  638.     /* Set updated alarm to be set */
  639.     if (counter_alarm != RTC_ALARM_RESETVALUE)
  640.     {
  641.       counter_alarm += counter_time;
  642.      
  643.       /* Write time counter in RTC registers */
  644.       if (RTC_WriteAlarmCounter(hrtc, counter_alarm) != HAL_OK)
  645.       {
  646.         return HAL_ERROR;
  647.       }
  648.     }
  649.     else
  650.     {
  651.       /* Alarm already occurred. Set it to reset values to avoid unexpected expiration */
  652.       if (RTC_WriteAlarmCounter(hrtc, counter_alarm) != HAL_OK)
  653.       {
  654.         return HAL_ERROR;
  655.       }
  656.     }
  657.    
  658.     /* Update date */
  659.     RTC_DateUpdate(hrtc, days_elapsed);
  660.   }
  661.   else
  662.   {
  663.     sTime->Hours = hours;    
  664.   }
  665.  
  666.   /* Check the input parameters format */
  667.   if(Format != RTC_FORMAT_BIN)
  668.   {
  669.     /* Convert the time structure parameters to BCD format */
  670.     sTime->Hours    = (uint8_t)RTC_ByteToBcd2(sTime->Hours);
  671.     sTime->Minutes  = (uint8_t)RTC_ByteToBcd2(sTime->Minutes);
  672.     sTime->Seconds  = (uint8_t)RTC_ByteToBcd2(sTime->Seconds);  
  673.   }
  674.  
  675.   return HAL_OK;
  676. }
  677.  
  678.  
  679. /**
  680.   * @brief  Sets RTC current date.
  681.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  682.   *                the configuration information for RTC.
  683.   * @param  sDate: Pointer to date structure
  684.   * @param  Format: specifies the format of the entered parameters.
  685.   *          This parameter can be one of the following values:
  686.   *            @arg RTC_FORMAT_BIN: Binary data format
  687.   *            @arg RTC_FORMAT_BCD: BCD data format
  688.   * @retval HAL status
  689.   */
  690. HAL_StatusTypeDef HAL_RTC_SetDate(RTC_HandleTypeDef *hrtc, RTC_DateTypeDef *sDate, uint32_t Format)
  691. {
  692.   uint32_t counter_time = 0, counter_alarm = 0, hours = 0;
  693.  
  694.   /* Check input parameters */
  695.   if((hrtc == NULL) || (sDate == NULL))
  696.   {
  697.      return HAL_ERROR;
  698.   }
  699.  
  700.   /* Check the parameters */
  701.   assert_param(IS_RTC_FORMAT(Format));
  702.  
  703.  /* Process Locked */
  704.  __HAL_LOCK(hrtc);
  705.  
  706.   hrtc->State = HAL_RTC_STATE_BUSY;
  707.  
  708.   if(Format == RTC_FORMAT_BIN)
  709.   {  
  710.     assert_param(IS_RTC_YEAR(sDate->Year));
  711.     assert_param(IS_RTC_MONTH(sDate->Month));
  712.     assert_param(IS_RTC_DATE(sDate->Date));
  713.  
  714.     /* Change the current date */
  715.     hrtc->DateToUpdate.Year  = sDate->Year;
  716.     hrtc->DateToUpdate.Month = sDate->Month;
  717.     hrtc->DateToUpdate.Date  = sDate->Date;
  718.   }
  719.   else
  720.   {  
  721.     assert_param(IS_RTC_YEAR(RTC_Bcd2ToByte(sDate->Year)));
  722.     assert_param(IS_RTC_MONTH(RTC_Bcd2ToByte(sDate->Month)));
  723.     assert_param(IS_RTC_DATE(RTC_Bcd2ToByte(sDate->Date)));
  724.    
  725.     /* Change the current date */
  726.     hrtc->DateToUpdate.Year  = RTC_Bcd2ToByte(sDate->Year);
  727.     hrtc->DateToUpdate.Month = RTC_Bcd2ToByte(sDate->Month);
  728.     hrtc->DateToUpdate.Date  = RTC_Bcd2ToByte(sDate->Date);
  729.   }
  730.  
  731.   /* WeekDay set by user can be ignored because automatically calculated */
  732.   hrtc->DateToUpdate.WeekDay = RTC_WeekDayNum(hrtc->DateToUpdate.Year, hrtc->DateToUpdate.Month, hrtc->DateToUpdate.Date);
  733.   sDate->WeekDay = hrtc->DateToUpdate.WeekDay;
  734.  
  735.   /* Reset time to be aligned on the same day */
  736.   /* Read the time counter*/
  737.   counter_time = RTC_ReadTimeCounter(hrtc);
  738.  
  739.   /* Fill the structure fields with the read parameters */
  740.   hours = counter_time / 3600;
  741.   if (hours > 24)
  742.   {
  743.     /* Set updated time in decreasing counter by number of days elapsed */
  744.     counter_time -= ((hours / 24) * 24 * 3600);
  745.     /* Write time counter in RTC registers */
  746.     if (RTC_WriteTimeCounter(hrtc, counter_time) != HAL_OK)
  747.     {
  748.       /* Set RTC state */
  749.       hrtc->State = HAL_RTC_STATE_ERROR;
  750.      
  751.       /* Process Unlocked */
  752.       __HAL_UNLOCK(hrtc);
  753.      
  754.       return HAL_ERROR;
  755.     }
  756.  
  757.     /* Read current Alarm counter in RTC registers */
  758.     counter_alarm = RTC_ReadAlarmCounter(hrtc);
  759.  
  760.     /* Set again alarm to match with new time if enabled */
  761.     if (counter_alarm != RTC_ALARM_RESETVALUE)
  762.     {
  763.       if(counter_alarm < counter_time)
  764.       {
  765.         /* Add 1 day to alarm counter*/
  766.         counter_alarm += (uint32_t)(24 * 3600);
  767.        
  768.         /* Write new Alarm counter in RTC registers */
  769.         if (RTC_WriteAlarmCounter(hrtc, counter_alarm) != HAL_OK)
  770.         {
  771.           /* Set RTC state */
  772.           hrtc->State = HAL_RTC_STATE_ERROR;
  773.          
  774.           /* Process Unlocked */
  775.           __HAL_UNLOCK(hrtc);
  776.          
  777.           return HAL_ERROR;
  778.         }
  779.       }
  780.     }
  781.    
  782.  
  783.   }
  784.  
  785.   hrtc->State = HAL_RTC_STATE_READY ;
  786.  
  787.   /* Process Unlocked */
  788.   __HAL_UNLOCK(hrtc);
  789.  
  790.   return HAL_OK;    
  791. }
  792.  
  793. /**
  794.   * @brief  Gets RTC current date.
  795.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  796.   *                the configuration information for RTC.
  797.   * @param  sDate: Pointer to Date structure
  798.   * @param  Format: Specifies the format of the entered parameters.
  799.   *          This parameter can be one of the following values:
  800.   *            @arg RTC_FORMAT_BIN:  Binary data format
  801.   *            @arg RTC_FORMAT_BCD:  BCD data format
  802.   * @retval HAL status
  803.   */
  804. HAL_StatusTypeDef HAL_RTC_GetDate(RTC_HandleTypeDef *hrtc, RTC_DateTypeDef *sDate, uint32_t Format)
  805. {
  806.   RTC_TimeTypeDef stime = {0};
  807.  
  808.   /* Check input parameters */
  809.   if((hrtc == NULL) || (sDate == NULL))
  810.   {
  811.      return HAL_ERROR;
  812.   }
  813.  
  814.   /* Check the parameters */
  815.   assert_param(IS_RTC_FORMAT(Format));
  816.  
  817.   /* Call HAL_RTC_GetTime function to update date if counter higher than 24 hours */
  818.   if (HAL_RTC_GetTime(hrtc, &stime, RTC_FORMAT_BIN) != HAL_OK)
  819.   {
  820.     return HAL_ERROR;
  821.   }
  822.  
  823.   /* Fill the structure fields with the read parameters */
  824.   sDate->WeekDay  = hrtc->DateToUpdate.WeekDay;
  825.   sDate->Year     = hrtc->DateToUpdate.Year;
  826.   sDate->Month    = hrtc->DateToUpdate.Month;
  827.   sDate->Date     = hrtc->DateToUpdate.Date;
  828.  
  829.   /* Check the input parameters format */
  830.   if(Format != RTC_FORMAT_BIN)
  831.   {    
  832.     /* Convert the date structure parameters to BCD format */
  833.     sDate->Year   = (uint8_t)RTC_ByteToBcd2(sDate->Year);
  834.     sDate->Month  = (uint8_t)RTC_ByteToBcd2(sDate->Month);
  835.     sDate->Date   = (uint8_t)RTC_ByteToBcd2(sDate->Date);  
  836.   }
  837.   return HAL_OK;
  838. }
  839.  
  840. /**
  841.   * @}
  842.   */
  843.  
  844. /** @defgroup RTC_Exported_Functions_Group3 Alarm functions
  845.  *  @brief   RTC Alarm functions
  846.  *
  847. @verbatim  
  848.  ===============================================================================
  849.                  ##### RTC Alarm functions #####
  850.  ===============================================================================  
  851.  
  852.  [..] This section provides functions allowing to configure Alarm feature
  853.  
  854. @endverbatim
  855.   * @{
  856.   */
  857.  
  858. /**
  859.   * @brief  Sets the specified RTC Alarm.
  860.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  861.   *                the configuration information for RTC.
  862.   * @param  sAlarm: Pointer to Alarm structure
  863.   * @param  Format: Specifies the format of the entered parameters.
  864.   *          This parameter can be one of the following values:
  865.   *             @arg RTC_FORMAT_BIN: Binary data format
  866.   *             @arg RTC_FORMAT_BCD: BCD data format
  867.   * @retval HAL status
  868.   */
  869. HAL_StatusTypeDef HAL_RTC_SetAlarm(RTC_HandleTypeDef *hrtc, RTC_AlarmTypeDef *sAlarm, uint32_t Format)
  870. {
  871.   uint32_t counter_alarm = 0, counter_time;
  872.   RTC_TimeTypeDef stime = {0};
  873.  
  874.   /* Check input parameters */
  875.   if((hrtc == NULL) || (sAlarm == NULL))
  876.   {
  877.      return HAL_ERROR;
  878.   }
  879.  
  880.   /* Check the parameters */
  881.   assert_param(IS_RTC_FORMAT(Format));
  882.   assert_param(IS_RTC_ALARM(sAlarm->Alarm));
  883.  
  884.   /* Process Locked */
  885.   __HAL_LOCK(hrtc);
  886.  
  887.   hrtc->State = HAL_RTC_STATE_BUSY;
  888.  
  889.   /* Call HAL_RTC_GetTime function to update date if counter higher than 24 hours */
  890.   if (HAL_RTC_GetTime(hrtc, &stime, RTC_FORMAT_BIN) != HAL_OK)
  891.   {
  892.     return HAL_ERROR;
  893.   }
  894.  
  895.   /* Convert time in seconds */
  896.   counter_time = (uint32_t)(((uint32_t)stime.Hours * 3600) + \
  897.                       ((uint32_t)stime.Minutes * 60) + \
  898.                       ((uint32_t)stime.Seconds));  
  899.  
  900.   if(Format == RTC_FORMAT_BIN)
  901.   {
  902.     assert_param(IS_RTC_HOUR24(sAlarm->AlarmTime.Hours));
  903.     assert_param(IS_RTC_MINUTES(sAlarm->AlarmTime.Minutes));
  904.     assert_param(IS_RTC_SECONDS(sAlarm->AlarmTime.Seconds));
  905.    
  906.     counter_alarm = (uint32_t)(((uint32_t)sAlarm->AlarmTime.Hours * 3600) + \
  907.                         ((uint32_t)sAlarm->AlarmTime.Minutes * 60) + \
  908.                         ((uint32_t)sAlarm->AlarmTime.Seconds));  
  909.   }
  910.   else
  911.   {
  912.     assert_param(IS_RTC_HOUR24(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)));
  913.     assert_param(IS_RTC_MINUTES(RTC_Bcd2ToByte(sAlarm->AlarmTime.Minutes)));
  914.     assert_param(IS_RTC_SECONDS(RTC_Bcd2ToByte(sAlarm->AlarmTime.Seconds)));
  915.    
  916.     counter_alarm = (((uint32_t)(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)) * 3600) + \
  917.               ((uint32_t)(RTC_Bcd2ToByte(sAlarm->AlarmTime.Minutes)) * 60) + \
  918.               ((uint32_t)RTC_Bcd2ToByte(sAlarm->AlarmTime.Seconds)));  
  919.   }
  920.  
  921.   /* Check that requested alarm should expire in the same day (otherwise add 1 day) */
  922.   if (counter_alarm < counter_time)
  923.   {
  924.     /* Add 1 day to alarm counter*/
  925.     counter_alarm += (uint32_t)(24 * 3600);
  926.   }
  927.  
  928.   /* Write Alarm counter in RTC registers */
  929.   if (RTC_WriteAlarmCounter(hrtc, counter_alarm) != HAL_OK)
  930.   {
  931.     /* Set RTC state */
  932.     hrtc->State = HAL_RTC_STATE_ERROR;
  933.    
  934.     /* Process Unlocked */
  935.     __HAL_UNLOCK(hrtc);
  936.    
  937.     return HAL_ERROR;
  938.   }
  939.   else
  940.   {
  941.     hrtc->State = HAL_RTC_STATE_READY;
  942.  
  943.    __HAL_UNLOCK(hrtc);
  944.      
  945.    return HAL_OK;
  946.   }
  947. }
  948.  
  949. /**
  950.   * @brief  Sets the specified RTC Alarm with Interrupt
  951.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  952.   *                the configuration information for RTC.
  953.   * @param  sAlarm: Pointer to Alarm structure
  954.   * @param  Format: Specifies the format of the entered parameters.
  955.   *          This parameter can be one of the following values:
  956.   *             @arg RTC_FORMAT_BIN: Binary data format
  957.   *             @arg RTC_FORMAT_BCD: BCD data format
  958.   * @note   The HAL_RTC_SetTime() must be called before enabling the Alarm feature.  
  959.   * @retval HAL status
  960.   */
  961. HAL_StatusTypeDef HAL_RTC_SetAlarm_IT(RTC_HandleTypeDef *hrtc, RTC_AlarmTypeDef *sAlarm, uint32_t Format)
  962. {
  963.   uint32_t counter_alarm = 0, counter_time;
  964.   RTC_TimeTypeDef stime = {0};
  965.  
  966.   /* Check input parameters */
  967.   if((hrtc == NULL) || (sAlarm == NULL))
  968.   {
  969.      return HAL_ERROR;
  970.   }
  971.  
  972.   /* Check the parameters */
  973.   assert_param(IS_RTC_FORMAT(Format));
  974.   assert_param(IS_RTC_ALARM(sAlarm->Alarm));
  975.  
  976.   /* Process Locked */
  977.   __HAL_LOCK(hrtc);
  978.  
  979.   hrtc->State = HAL_RTC_STATE_BUSY;
  980.  
  981.   /* Call HAL_RTC_GetTime function to update date if counter higher than 24 hours */
  982.   if (HAL_RTC_GetTime(hrtc, &stime, RTC_FORMAT_BIN) != HAL_OK)
  983.   {
  984.     return HAL_ERROR;
  985.   }
  986.  
  987.   /* Convert time in seconds */
  988.   counter_time = (uint32_t)(((uint32_t)stime.Hours * 3600) + \
  989.                       ((uint32_t)stime.Minutes * 60) + \
  990.                       ((uint32_t)stime.Seconds));  
  991.  
  992.   if(Format == RTC_FORMAT_BIN)
  993.   {
  994.     assert_param(IS_RTC_HOUR24(sAlarm->AlarmTime.Hours));
  995.     assert_param(IS_RTC_MINUTES(sAlarm->AlarmTime.Minutes));
  996.     assert_param(IS_RTC_SECONDS(sAlarm->AlarmTime.Seconds));
  997.    
  998.     counter_alarm = (uint32_t)(((uint32_t)sAlarm->AlarmTime.Hours * 3600) + \
  999.       ((uint32_t)sAlarm->AlarmTime.Minutes * 60) + \
  1000.         ((uint32_t)sAlarm->AlarmTime.Seconds));  
  1001.   }
  1002.   else
  1003.   {
  1004.     assert_param(IS_RTC_HOUR24(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)));
  1005.     assert_param(IS_RTC_MINUTES(RTC_Bcd2ToByte(sAlarm->AlarmTime.Minutes)));
  1006.     assert_param(IS_RTC_SECONDS(RTC_Bcd2ToByte(sAlarm->AlarmTime.Seconds)));
  1007.    
  1008.     counter_alarm = (((uint32_t)(RTC_Bcd2ToByte(sAlarm->AlarmTime.Hours)) * 3600) + \
  1009.       ((uint32_t)(RTC_Bcd2ToByte(sAlarm->AlarmTime.Minutes)) * 60) + \
  1010.         ((uint32_t)RTC_Bcd2ToByte(sAlarm->AlarmTime.Seconds)));  
  1011.   }
  1012.  
  1013.   /* Check that requested alarm should expire in the same day (otherwise add 1 day) */
  1014.   if (counter_alarm < counter_time)
  1015.   {
  1016.     /* Add 1 day to alarm counter*/
  1017.     counter_alarm += (uint32_t)(24 * 3600);
  1018.   }
  1019.  
  1020.   /* Write alarm counter in RTC registers */
  1021.   if (RTC_WriteAlarmCounter(hrtc, counter_alarm) != HAL_OK)
  1022.   {
  1023.     /* Set RTC state */
  1024.     hrtc->State = HAL_RTC_STATE_ERROR;
  1025.    
  1026.     /* Process Unlocked */
  1027.     __HAL_UNLOCK(hrtc);
  1028.    
  1029.     return HAL_ERROR;
  1030.   }
  1031.   else
  1032.   {
  1033.     /* Clear flag alarm A */
  1034.     __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF);
  1035.    
  1036.     /* Configure the Alarm interrupt */
  1037.     __HAL_RTC_ALARM_ENABLE_IT(hrtc,RTC_IT_ALRA);
  1038.    
  1039.     /* RTC Alarm Interrupt Configuration: EXTI configuration */
  1040.     __HAL_RTC_ALARM_EXTI_ENABLE_IT();
  1041.    
  1042.     __HAL_RTC_ALARM_EXTI_ENABLE_RISING_EDGE();
  1043.  
  1044.     hrtc->State = HAL_RTC_STATE_READY;
  1045.  
  1046.    __HAL_UNLOCK(hrtc);
  1047.      
  1048.    return HAL_OK;
  1049.   }
  1050. }
  1051.  
  1052. /**
  1053.   * @brief  Gets the RTC Alarm value and masks.
  1054.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1055.   *                the configuration information for RTC.
  1056.   * @param  sAlarm: Pointer to Date structure
  1057.   * @param  Alarm: Specifies the Alarm.
  1058.   *          This parameter can be one of the following values:
  1059.   *             @arg RTC_ALARM_A: Alarm
  1060.   * @param  Format: Specifies the format of the entered parameters.
  1061.   *          This parameter can be one of the following values:
  1062.   *             @arg RTC_FORMAT_BIN: Binary data format
  1063.   *             @arg RTC_FORMAT_BCD: BCD data format
  1064.   * @retval HAL status
  1065.   */
  1066. HAL_StatusTypeDef HAL_RTC_GetAlarm(RTC_HandleTypeDef *hrtc, RTC_AlarmTypeDef *sAlarm, uint32_t Alarm, uint32_t Format)
  1067. {
  1068.   uint32_t counter_alarm = 0;
  1069.  
  1070.   /* Check input parameters */
  1071.   if((hrtc == NULL) || (sAlarm == NULL))
  1072.   {
  1073.      return HAL_ERROR;
  1074.   }
  1075.  
  1076.   /* Check the parameters */
  1077.   assert_param(IS_RTC_FORMAT(Format));
  1078.   assert_param(IS_RTC_ALARM(Alarm));
  1079.  
  1080.   /* Read Alarm counter in RTC registers */
  1081.   counter_alarm = RTC_ReadAlarmCounter(hrtc);
  1082.  
  1083.   /* Fill the structure with the read parameters */
  1084.   /* Set hours in a day range (between 0 to 24)*/
  1085.   sAlarm->AlarmTime.Hours   = (uint32_t)((counter_alarm / 3600) % 24);
  1086.   sAlarm->AlarmTime.Minutes = (uint32_t)((counter_alarm % 3600) / 60);
  1087.   sAlarm->AlarmTime.Seconds = (uint32_t)((counter_alarm % 3600) % 60);
  1088.  
  1089.   if(Format != RTC_FORMAT_BIN)
  1090.   {
  1091.     sAlarm->AlarmTime.Hours   = RTC_ByteToBcd2(sAlarm->AlarmTime.Hours);
  1092.     sAlarm->AlarmTime.Minutes = RTC_ByteToBcd2(sAlarm->AlarmTime.Minutes);
  1093.     sAlarm->AlarmTime.Seconds = RTC_ByteToBcd2(sAlarm->AlarmTime.Seconds);
  1094.   }  
  1095.  
  1096.   return HAL_OK;
  1097. }
  1098.  
  1099. /**
  1100.   * @brief  Deactive the specified RTC Alarm
  1101.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1102.   *                the configuration information for RTC.
  1103.   * @param  Alarm: Specifies the Alarm.
  1104.   *          This parameter can be one of the following values:
  1105.   *            @arg RTC_ALARM_A:  AlarmA
  1106.   * @retval HAL status
  1107.   */
  1108. HAL_StatusTypeDef HAL_RTC_DeactivateAlarm(RTC_HandleTypeDef *hrtc, uint32_t Alarm)
  1109. {
  1110.   /* Check the parameters */
  1111.   assert_param(IS_RTC_ALARM(Alarm));
  1112.  
  1113.   /* Check input parameters */
  1114.   if(hrtc == NULL)
  1115.   {
  1116.      return HAL_ERROR;
  1117.   }
  1118.  
  1119.   /* Process Locked */
  1120.   __HAL_LOCK(hrtc);
  1121.  
  1122.   hrtc->State = HAL_RTC_STATE_BUSY;
  1123.  
  1124.   /* In case of interrupt mode is used, the interrupt source must disabled */
  1125.   __HAL_RTC_ALARM_DISABLE_IT(hrtc, RTC_IT_ALRA);
  1126.  
  1127.   /* Set Initialization mode */
  1128.   if(RTC_EnterInitMode(hrtc) != HAL_OK)
  1129.   {
  1130.     /* Set RTC state */
  1131.     hrtc->State = HAL_RTC_STATE_ERROR;
  1132.    
  1133.     /* Process Unlocked */
  1134.     __HAL_UNLOCK(hrtc);
  1135.    
  1136.     return HAL_ERROR;
  1137.   }
  1138.   else
  1139.   {
  1140.     /* Clear flag alarm A */
  1141.     __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF);
  1142.    
  1143.     /* Set to default values ALRH & ALRL registers */
  1144.     WRITE_REG(hrtc->Instance->ALRH, RTC_ALARM_RESETVALUE_REGISTER);
  1145.     WRITE_REG(hrtc->Instance->ALRL, RTC_ALARM_RESETVALUE_REGISTER);
  1146.  
  1147.     /* RTC Alarm Interrupt Configuration: Disable EXTI configuration */
  1148.     __HAL_RTC_ALARM_EXTI_DISABLE_IT();
  1149.    
  1150.     /* Wait for synchro */
  1151.     if(RTC_ExitInitMode(hrtc) != HAL_OK)
  1152.     {      
  1153.       hrtc->State = HAL_RTC_STATE_ERROR;
  1154.      
  1155.       /* Process Unlocked */
  1156.       __HAL_UNLOCK(hrtc);
  1157.      
  1158.       return HAL_ERROR;
  1159.     }
  1160.   }
  1161.   hrtc->State = HAL_RTC_STATE_READY;
  1162.  
  1163.   /* Process Unlocked */
  1164.   __HAL_UNLOCK(hrtc);  
  1165.  
  1166.   return HAL_OK;
  1167. }
  1168.  
  1169. /**
  1170.   * @brief  This function handles Alarm interrupt request.
  1171.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1172.   *                the configuration information for RTC.
  1173.   * @retval None
  1174.   */
  1175. void HAL_RTC_AlarmIRQHandler(RTC_HandleTypeDef* hrtc)
  1176. {  
  1177.   if(__HAL_RTC_ALARM_GET_IT_SOURCE(hrtc, RTC_IT_ALRA))
  1178.   {
  1179.     /* Get the status of the Interrupt */
  1180.     if(__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAF) != (uint32_t)RESET)
  1181.     {
  1182.       /* AlarmA callback */
  1183.       HAL_RTC_AlarmAEventCallback(hrtc);
  1184.      
  1185.       /* Clear the Alarm interrupt pending bit */
  1186.       __HAL_RTC_ALARM_CLEAR_FLAG(hrtc,RTC_FLAG_ALRAF);
  1187.     }
  1188.   }
  1189.  
  1190.   /* Clear the EXTI's line Flag for RTC Alarm */
  1191.   __HAL_RTC_ALARM_EXTI_CLEAR_FLAG();
  1192.  
  1193.   /* Change RTC state */
  1194.   hrtc->State = HAL_RTC_STATE_READY;
  1195. }
  1196.  
  1197. /**
  1198.   * @brief  Alarm A callback.
  1199.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1200.   *                the configuration information for RTC.
  1201.   * @retval None
  1202.   */
  1203. __weak void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
  1204. {
  1205.   /* Prevent unused argument(s) compilation warning */
  1206.   UNUSED(hrtc);
  1207.   /* NOTE : This function Should not be modified, when the callback is needed,
  1208.             the HAL_RTC_AlarmAEventCallback could be implemented in the user file
  1209.    */
  1210. }
  1211.  
  1212. /**
  1213.   * @brief  This function handles AlarmA Polling request.
  1214.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1215.   *                the configuration information for RTC.
  1216.   * @param  Timeout: Timeout duration
  1217.   * @retval HAL status
  1218.   */
  1219. HAL_StatusTypeDef HAL_RTC_PollForAlarmAEvent(RTC_HandleTypeDef *hrtc, uint32_t Timeout)
  1220. {  
  1221.   uint32_t tickstart = HAL_GetTick();  
  1222.  
  1223.   /* Check input parameters */
  1224.   if(hrtc == NULL)
  1225.   {
  1226.      return HAL_ERROR;
  1227.   }
  1228.  
  1229.   while(__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAF) == RESET)
  1230.   {
  1231.     if(Timeout != HAL_MAX_DELAY)
  1232.     {
  1233.       if((Timeout == 0)||((HAL_GetTick() - tickstart ) > Timeout))
  1234.       {
  1235.         hrtc->State = HAL_RTC_STATE_TIMEOUT;
  1236.         return HAL_TIMEOUT;
  1237.       }
  1238.     }
  1239.   }
  1240.  
  1241.   /* Clear the Alarm interrupt pending bit */
  1242.   __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF);
  1243.  
  1244.   /* Change RTC state */
  1245.   hrtc->State = HAL_RTC_STATE_READY;
  1246.  
  1247.   return HAL_OK;  
  1248. }
  1249.  
  1250. /**
  1251.   * @}
  1252.   */
  1253.  
  1254. /** @defgroup RTC_Exported_Functions_Group4 Peripheral State functions
  1255.  *  @brief   Peripheral State functions
  1256.  *
  1257. @verbatim  
  1258.  ===============================================================================
  1259.                      ##### Peripheral State functions #####
  1260.  ===============================================================================  
  1261.     [..]
  1262.     This subsection provides functions allowing to
  1263.       (+) Get RTC state
  1264.  
  1265. @endverbatim
  1266.   * @{
  1267.   */
  1268. /**
  1269.   * @brief  Returns the RTC state.
  1270.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1271.   *                the configuration information for RTC.
  1272.   * @retval HAL state
  1273.   */
  1274. HAL_RTCStateTypeDef HAL_RTC_GetState(RTC_HandleTypeDef* hrtc)
  1275. {
  1276.   return hrtc->State;
  1277. }
  1278.  
  1279. /**
  1280.   * @}
  1281.   */
  1282.  
  1283. /** @defgroup RTC_Exported_Functions_Group5 Peripheral Control functions
  1284.  *  @brief   Peripheral Control functions
  1285.  *
  1286. @verbatim  
  1287.  ===============================================================================
  1288.                      ##### Peripheral Control functions #####
  1289.  ===============================================================================  
  1290.     [..]
  1291.     This subsection provides functions allowing to
  1292.       (+) Wait for RTC Time and Date Synchronization
  1293.  
  1294. @endverbatim
  1295.   * @{
  1296.   */
  1297.  
  1298. /**
  1299.   * @brief  Waits until the RTC registers (RTC_CNT, RTC_ALR and RTC_PRL)
  1300.   *   are synchronized with RTC APB clock.
  1301.   * @note   This function must be called before any read operation after an APB reset
  1302.   *   or an APB clock stop.
  1303.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1304.   *                the configuration information for RTC.
  1305.   * @retval HAL status
  1306.   */
  1307. HAL_StatusTypeDef HAL_RTC_WaitForSynchro(RTC_HandleTypeDef* hrtc)
  1308. {
  1309.   uint32_t tickstart = 0;
  1310.  
  1311.   /* Check input parameters */
  1312.   if(hrtc == NULL)
  1313.   {
  1314.      return HAL_ERROR;
  1315.   }
  1316.  
  1317.   /* Clear RSF flag */
  1318.   CLEAR_BIT(hrtc->Instance->CRL, RTC_FLAG_RSF);
  1319.  
  1320.   tickstart = HAL_GetTick();
  1321.  
  1322.   /* Wait the registers to be synchronised */
  1323.   while((hrtc->Instance->CRL & RTC_FLAG_RSF) == (uint32_t)RESET)
  1324.   {
  1325.     if((HAL_GetTick() - tickstart ) >  RTC_TIMEOUT_VALUE)
  1326.     {      
  1327.       return HAL_TIMEOUT;
  1328.     }
  1329.   }
  1330.  
  1331.   return HAL_OK;
  1332. }
  1333.  
  1334. /**
  1335.   * @}
  1336.   */
  1337.  
  1338.  
  1339. /**
  1340.   * @}
  1341.   */
  1342.  
  1343. /** @addtogroup RTC_Private_Functions
  1344.   * @{
  1345.   */
  1346.  
  1347.  
  1348. /**
  1349.   * @brief  Read the time counter available in RTC_CNT registers.
  1350.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1351.   *                the configuration information for RTC.
  1352.   * @retval Time counter
  1353.   */
  1354. static uint32_t RTC_ReadTimeCounter(RTC_HandleTypeDef* hrtc)
  1355. {
  1356.   uint16_t high1 = 0, high2 = 0, low = 0;
  1357.   uint32_t timecounter = 0;
  1358.  
  1359.   high1 = READ_REG(hrtc->Instance->CNTH & RTC_CNTH_RTC_CNT);
  1360.   low   = READ_REG(hrtc->Instance->CNTL & RTC_CNTL_RTC_CNT);
  1361.   high2 = READ_REG(hrtc->Instance->CNTH & RTC_CNTH_RTC_CNT);
  1362.  
  1363.   if (high1 != high2)
  1364.   { /* In this case the counter roll over during reading of CNTL and CNTH registers,
  1365.        read again CNTL register then return the counter value */
  1366.     timecounter = (((uint32_t) high2 << 16 ) | READ_REG(hrtc->Instance->CNTL & RTC_CNTL_RTC_CNT));
  1367.   }
  1368.   else
  1369.   { /* No counter roll over during reading of CNTL and CNTH registers, counter
  1370.        value is equal to first value of CNTL and CNTH */
  1371.     timecounter = (((uint32_t) high1 << 16 ) | low);
  1372.   }
  1373.  
  1374.   return timecounter;
  1375. }
  1376.  
  1377. /**
  1378.   * @brief  Write the time counter in RTC_CNT registers.
  1379.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1380.   *                the configuration information for RTC.
  1381.   * @param  TimeCounter: Counter to write in RTC_CNT registers
  1382.   * @retval HAL status
  1383.   */
  1384. static HAL_StatusTypeDef RTC_WriteTimeCounter(RTC_HandleTypeDef* hrtc, uint32_t TimeCounter)
  1385. {
  1386.   HAL_StatusTypeDef status = HAL_OK;
  1387.  
  1388.   /* Set Initialization mode */
  1389.   if(RTC_EnterInitMode(hrtc) != HAL_OK)
  1390.   {
  1391.     status = HAL_ERROR;
  1392.   }
  1393.   else
  1394.   {
  1395.     /* Set RTC COUNTER MSB word */
  1396.     WRITE_REG(hrtc->Instance->CNTH, (TimeCounter >> 16));
  1397.     /* Set RTC COUNTER LSB word */
  1398.     WRITE_REG(hrtc->Instance->CNTL, (TimeCounter & RTC_CNTL_RTC_CNT));
  1399.    
  1400.     /* Wait for synchro */
  1401.     if(RTC_ExitInitMode(hrtc) != HAL_OK)
  1402.     {      
  1403.       status = HAL_ERROR;
  1404.     }
  1405.   }
  1406.  
  1407.   return status;
  1408. }
  1409.  
  1410. /**
  1411.   * @brief  Read the time counter available in RTC_ALR registers.
  1412.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1413.   *                the configuration information for RTC.
  1414.   * @retval Time counter
  1415.   */
  1416. static uint32_t RTC_ReadAlarmCounter(RTC_HandleTypeDef* hrtc)
  1417. {
  1418.   uint16_t high1 = 0, low = 0;
  1419.  
  1420.   high1 = READ_REG(hrtc->Instance->ALRH & RTC_CNTH_RTC_CNT);
  1421.   low   = READ_REG(hrtc->Instance->ALRL & RTC_CNTL_RTC_CNT);
  1422.  
  1423.   return (((uint32_t) high1 << 16 ) | low);
  1424. }
  1425.  
  1426. /**
  1427.   * @brief  Write the time counter in RTC_ALR registers.
  1428.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1429.   *                the configuration information for RTC.
  1430.   * @param  AlarmCounter: Counter to write in RTC_ALR registers
  1431.   * @retval HAL status
  1432.   */
  1433. static HAL_StatusTypeDef RTC_WriteAlarmCounter(RTC_HandleTypeDef* hrtc, uint32_t AlarmCounter)
  1434. {
  1435.   HAL_StatusTypeDef status = HAL_OK;
  1436.  
  1437.   /* Set Initialization mode */
  1438.   if(RTC_EnterInitMode(hrtc) != HAL_OK)
  1439.   {
  1440.     status = HAL_ERROR;
  1441.   }
  1442.   else
  1443.   {
  1444.     /* Set RTC COUNTER MSB word */
  1445.     WRITE_REG(hrtc->Instance->ALRH, (AlarmCounter >> 16));
  1446.     /* Set RTC COUNTER LSB word */
  1447.     WRITE_REG(hrtc->Instance->ALRL, (AlarmCounter & RTC_ALRL_RTC_ALR));
  1448.    
  1449.     /* Wait for synchro */
  1450.     if(RTC_ExitInitMode(hrtc) != HAL_OK)
  1451.     {      
  1452.       status = HAL_ERROR;
  1453.     }
  1454.   }
  1455.  
  1456.   return status;
  1457. }
  1458.  
  1459. /**
  1460.   * @brief  Enters the RTC Initialization mode.
  1461.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1462.   *                the configuration information for RTC.
  1463.   * @retval HAL status
  1464.   */
  1465. static HAL_StatusTypeDef RTC_EnterInitMode(RTC_HandleTypeDef* hrtc)
  1466. {
  1467.   uint32_t tickstart = 0;
  1468.  
  1469.   tickstart = HAL_GetTick();
  1470.   /* Wait till RTC is in INIT state and if Time out is reached exit */
  1471.   while((hrtc->Instance->CRL & RTC_CRL_RTOFF) == (uint32_t)RESET)
  1472.   {
  1473.     if((HAL_GetTick() - tickstart) >  RTC_TIMEOUT_VALUE)
  1474.     {      
  1475.       return HAL_TIMEOUT;
  1476.     }
  1477.   }
  1478.  
  1479.   /* Disable the write protection for RTC registers */
  1480.   __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
  1481.  
  1482.  
  1483.   return HAL_OK;  
  1484. }
  1485.  
  1486. /**
  1487.   * @brief  Exit the RTC Initialization mode.
  1488.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1489.   *                the configuration information for RTC.
  1490.   * @retval HAL status
  1491.   */
  1492. static HAL_StatusTypeDef RTC_ExitInitMode(RTC_HandleTypeDef* hrtc)
  1493. {
  1494.   uint32_t tickstart = 0;
  1495.  
  1496.   /* Disable the write protection for RTC registers */
  1497.   __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
  1498.  
  1499.   tickstart = HAL_GetTick();
  1500.   /* Wait till RTC is in INIT state and if Time out is reached exit */
  1501.   while((hrtc->Instance->CRL & RTC_CRL_RTOFF) == (uint32_t)RESET)
  1502.   {
  1503.     if((HAL_GetTick() - tickstart) >  RTC_TIMEOUT_VALUE)
  1504.     {      
  1505.       return HAL_TIMEOUT;
  1506.     }
  1507.   }
  1508.  
  1509.   return HAL_OK;  
  1510. }
  1511.  
  1512. /**
  1513.   * @brief  Converts a 2 digit decimal to BCD format.
  1514.   * @param  Value: Byte to be converted
  1515.   * @retval Converted byte
  1516.   */
  1517. static uint8_t RTC_ByteToBcd2(uint8_t Value)
  1518. {
  1519.   uint32_t bcdhigh = 0;
  1520.  
  1521.   while(Value >= 10)
  1522.   {
  1523.     bcdhigh++;
  1524.     Value -= 10;
  1525.   }
  1526.  
  1527.   return  ((uint8_t)(bcdhigh << 4) | Value);
  1528. }
  1529.  
  1530. /**
  1531.   * @brief  Converts from 2 digit BCD to Binary.
  1532.   * @param  Value: BCD value to be converted
  1533.   * @retval Converted word
  1534.   */
  1535. static uint8_t RTC_Bcd2ToByte(uint8_t Value)
  1536. {
  1537.   uint32_t tmp = 0;
  1538.   tmp = ((uint8_t)(Value & (uint8_t)0xF0) >> (uint8_t)0x4) * 10;
  1539.   return (tmp + (Value & (uint8_t)0x0F));
  1540. }
  1541.  
  1542. /**
  1543.   * @brief  Updates date when time is 23:59:59.
  1544.   * @param  hrtc   pointer to a RTC_HandleTypeDef structure that contains
  1545.   *                the configuration information for RTC.
  1546.   * @param  DayElapsed: Number of days elapsed from last date update
  1547.   * @retval None
  1548.   */
  1549. static void RTC_DateUpdate(RTC_HandleTypeDef* hrtc, uint32_t DayElapsed)
  1550. {
  1551.   uint32_t year = 0, month = 0, day = 0;
  1552.   uint32_t loop = 0;
  1553.  
  1554.   /* Get the current year*/
  1555.   year = hrtc->DateToUpdate.Year;
  1556.  
  1557.   /* Get the current month and day */
  1558.   month = hrtc->DateToUpdate.Month;
  1559.   day = hrtc->DateToUpdate.Date;
  1560.  
  1561.   for (loop = 0; loop < DayElapsed; loop++)
  1562.   {
  1563.     if((month == 1) || (month == 3) || (month == 5) || (month == 7) || \
  1564.        (month == 8) || (month == 10) || (month == 12))
  1565.     {
  1566.       if(day < 31)
  1567.       {
  1568.         day++;
  1569.       }
  1570.       /* Date structure member: day = 31 */
  1571.       else
  1572.       {
  1573.         if(month != 12)
  1574.         {
  1575.           month++;
  1576.           day = 1;
  1577.         }
  1578.         /* Date structure member: day = 31 & month =12 */
  1579.         else
  1580.         {
  1581.           month = 1;
  1582.           day = 1;
  1583.           year++;
  1584.         }
  1585.       }
  1586.     }
  1587.     else if((month == 4) || (month == 6) || (month == 9) || (month == 11))
  1588.     {
  1589.       if(day < 30)
  1590.       {
  1591.         day++;
  1592.       }
  1593.       /* Date structure member: day = 30 */
  1594.       else
  1595.       {
  1596.         month++;
  1597.         day = 1;
  1598.       }
  1599.     }
  1600.     else if(month == 2)
  1601.     {
  1602.       if(day < 28)
  1603.       {
  1604.         day++;
  1605.       }
  1606.       else if(day == 28)
  1607.       {
  1608.         /* Leap year */
  1609.         if(RTC_IsLeapYear(year))
  1610.         {
  1611.           day++;
  1612.         }
  1613.         else
  1614.         {
  1615.           month++;
  1616.           day = 1;
  1617.         }
  1618.       }
  1619.       else if(day == 29)
  1620.       {
  1621.         month++;
  1622.         day = 1;
  1623.       }
  1624.     }
  1625.   }
  1626.  
  1627.   /* Update year */
  1628.   hrtc->DateToUpdate.Year = year;
  1629.  
  1630.   /* Update day and month */
  1631.   hrtc->DateToUpdate.Month = month;
  1632.   hrtc->DateToUpdate.Date = day;
  1633.  
  1634.   /* Update day of the week */
  1635.   hrtc->DateToUpdate.WeekDay = RTC_WeekDayNum(year, month, day);
  1636. }
  1637.  
  1638. /**
  1639.   * @brief  Check whether the passed year is Leap or not.
  1640.   * @param  nYear  year to check
  1641.   * @retval 1: leap year
  1642.   *         0: not leap year
  1643.   */
  1644. static uint8_t RTC_IsLeapYear(uint16_t nYear)
  1645. {
  1646.   if((nYear % 4) != 0)
  1647.   {
  1648.     return 0;
  1649.   }
  1650.  
  1651.   if((nYear % 100) != 0)
  1652.   {
  1653.     return 1;
  1654.   }
  1655.  
  1656.   if((nYear % 400) == 0)
  1657.   {
  1658.     return 1;
  1659.   }
  1660.   else
  1661.   {
  1662.     return 0;
  1663.   }
  1664. }
  1665.  
  1666. /**
  1667.   * @brief  Determines the week number, the day number and the week day number.
  1668.   * @param  nYear   year to check
  1669.   * @param  nMonth  Month to check
  1670.   * @param  nDay    Day to check
  1671.   * @note   Day is calculated with hypothesis that year > 2000
  1672.   * @retval Value which can take one of the following parameters:
  1673.   *         @arg RTC_WEEKDAY_MONDAY
  1674.   *         @arg RTC_WEEKDAY_TUESDAY
  1675.   *         @arg RTC_WEEKDAY_WEDNESDAY
  1676.   *         @arg RTC_WEEKDAY_THURSDAY
  1677.   *         @arg RTC_WEEKDAY_FRIDAY
  1678.   *         @arg RTC_WEEKDAY_SATURDAY
  1679.   *         @arg RTC_WEEKDAY_SUNDAY
  1680.   */
  1681. static uint8_t RTC_WeekDayNum(uint32_t nYear, uint8_t nMonth, uint8_t nDay)
  1682. {
  1683.   uint32_t year = 0, weekday = 0;
  1684.  
  1685.   year = 2000 + nYear;
  1686.  
  1687.   if(nMonth < 3)
  1688.   {
  1689.     /*D = { [(23 x month)/9] + day + 4 + year + [(year-1)/4] - [(year-1)/100] + [(year-1)/400] } mod 7*/
  1690.     weekday = (((23 * nMonth)/9) + nDay + 4 + year + ((year-1)/4) - ((year-1)/100) + ((year-1)/400)) % 7;
  1691.   }
  1692.   else
  1693.   {
  1694.     /*D = { [(23 x month)/9] + day + 4 + year + [year/4] - [year/100] + [year/400] - 2 } mod 7*/
  1695.     weekday = (((23 * nMonth)/9) + nDay + 4 + year + (year/4) - (year/100) + (year/400) - 2 ) % 7;
  1696.   }
  1697.  
  1698.   return (uint8_t)weekday;
  1699. }
  1700.  
  1701. /**
  1702.   * @}
  1703.   */
  1704.  
  1705. #endif /* HAL_RTC_MODULE_ENABLED */
  1706. /**
  1707.   * @}
  1708.   */
  1709.  
  1710. /**
  1711.   * @}
  1712.   */
  1713.  
  1714. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
  1715.