spd-lorabees/Src/hw_rtc.c

/*
 / _____)             _              | |
( (____  _____ ____ _| |_ _____  ____| |__
 \____ \| ___ |    (_   _) ___ |/ ___)  _ \
 _____) ) ____| | | || |_| ____( (___| | | |
(______/|_____)_|_|_| \__)_____)\____)_| |_|
    (C)2013 Semtech

Description: MCU RTC timer

License: Revised BSD License, see LICENSE.TXT file include in the project

Maintainer: Miguel Luis and Gregory Cristian
*/
 /*******************************************************************************
  * @file    hw_rtc.c
  * @author  MCD Application Team
  * @version V1.1.2
  * @date    08-September-2017
  * @brief   driver for RTC
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics International N.V. 
  * All rights reserved.</center></h2>
  *
  * Redistribution and use in source and binary forms, with or without 
  * modification, are permitted, provided that the following conditions are met:
  *
  * 1. Redistribution of source code must retain the above copyright notice, 
  *    this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  *    this list of conditions and the following disclaimer in the documentation
  *    and/or other materials provided with the distribution.
  * 3. Neither the name of STMicroelectronics nor the names of other 
  *    contributors to this software may be used to endorse or promote products 
  *    derived from this software without specific written permission.
  * 4. This software, including modifications and/or derivative works of this 
  *    software, must execute solely and exclusively on microcontroller or
  *    microprocessor devices manufactured by or for STMicroelectronics.
  * 5. Redistribution and use of this software other than as permitted under 
  *    this license is void and will automatically terminate your rights under 
  *    this license. 
  *
  * THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS" 
  * AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT 
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 
  * PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
  * RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT 
  * SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
  * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
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  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "hw.h"
#include "low_power.h"

/* Private typedef -----------------------------------------------------------*/
typedef struct
{
  TimerTime_t Rtc_Time; /* Reference time */
  
  RTC_TimeTypeDef RTC_Calndr_Time; /* Reference time in calendar format */

  RTC_DateTypeDef RTC_Calndr_Date; /* Reference date in calendar format */
  
} RtcTimerContext_t;

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

/* MCU Wake Up Time */
#define MIN_ALARM_DELAY               3 /* in ticks */

/* subsecond number of bits */
#define N_PREDIV_S                 10

/* Synchonuous prediv  */
#define PREDIV_S                  ((1<<N_PREDIV_S)-1)

/* Asynchonuous prediv   */
#define PREDIV_A                  (1<<(15-N_PREDIV_S))-1

/* Sub-second mask definition  */
#if  (N_PREDIV_S == 10)
#define HW_RTC_ALARMSUBSECONDMASK RTC_ALARMSUBSECONDMASK_SS14_10
#else
#error "Please define HW_RTC_ALARMSUBSECONDMASK"
#endif

/* RTC Time base in us */
#define USEC_NUMBER               1000000
#define MSEC_NUMBER               (USEC_NUMBER/1000)
#define RTC_ALARM_TIME_BASE       (USEC_NUMBER>>N_PREDIV_S)

#define COMMON_FACTOR        3
#define CONV_NUMER                (MSEC_NUMBER>>COMMON_FACTOR)
#define CONV_DENOM                (1<<(N_PREDIV_S-COMMON_FACTOR))

#define  DAYS_IN_LEAP_YEAR (uint32_t) 366

#define  DAYS_IN_YEAR      (uint32_t) 365

#define  SECONDS_IN_1DAY   (uint32_t) 86400

#define  SECONDS_IN_1HOUR   (uint32_t) 3600

#define  SECONDS_IN_1MINUTE   (uint32_t) 60

#define  MINUTES_IN_1HOUR    (uint32_t) 60

#define  HOURS_IN_1DAY      (uint32_t) 24

#define  DAYS_IN_MONTH_CORRECTION_NORM     ((uint32_t) 0x99AAA0 )
#define  DAYS_IN_MONTH_CORRECTION_LEAP     ((uint32_t) 0x445550 )


/* Calculates ceiling(X/N) */
#define DIVC(X,N)   ( ( (X) + (N) -1 ) / (N) )


/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/*!
 * \brief Indicates if the RTC is already Initalized or not
 */
static bool HW_RTC_Initalized = false;

/*!
 * \brief compensates MCU wakeup time
 */
 
static bool McuWakeUpTimeInitialized = false;

/*!
 * \brief compensates MCU wakeup time
 */
 
static int16_t McuWakeUpTimeCal = 0;

/*!
 * Number of days in each month on a normal year
 */
static const uint8_t DaysInMonth[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

/*!
 * Number of days in each month on a leap year
 */
static const uint8_t DaysInMonthLeapYear[] = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

static RTC_HandleTypeDef RtcHandle={0};

static RTC_AlarmTypeDef RTC_AlarmStructure;

/*!
 * Keep the value of the RTC timer when the RTC alarm is set
 * Set with the HW_RTC_SetTimerContext function
 * Value is kept as a Reference to calculate alarm
 */
static RtcTimerContext_t RtcTimerContext;

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

static void HW_RTC_SetConfig( void );

static void HW_RTC_SetAlarmConfig( void );

static void HW_RTC_StartWakeUpAlarm( uint32_t timeoutValue );

static TimerTime_t HW_RTC_GetCalendarValue(  RTC_DateTypeDef* RTC_DateStruct, RTC_TimeTypeDef* RTC_TimeStruct  );

/* Exported functions ---------------------------------------------------------*/

/*!
 * @brief Initializes the RTC timer
 * @note The timer is based on the RTC
 * @param none
 * @retval none
 */
void HW_RTC_Init( void )
{
  if( HW_RTC_Initalized == false )
  {
    HW_RTC_SetConfig( );
    HW_RTC_SetAlarmConfig( );
    HW_RTC_SetTimerContext( );
    HW_RTC_Initalized = true;
  }
}

/*!
 * @brief Configures the RTC timer
 * @note The timer is based on the RTC
 * @param none
 * @retval none
 */
static void HW_RTC_SetConfig( void )
{
  RTC_TimeTypeDef RTC_TimeStruct;
  RTC_DateTypeDef RTC_DateStruct;

  RtcHandle.Instance = RTC;

  RtcHandle.Init.HourFormat = RTC_HOURFORMAT_24;
  RtcHandle.Init.AsynchPrediv = PREDIV_A; /* RTC_ASYNCH_PREDIV; */
  RtcHandle.Init.SynchPrediv = PREDIV_S; /* RTC_SYNCH_PREDIV; */
  RtcHandle.Init.OutPut = RTC_OUTPUT;
  RtcHandle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
  RtcHandle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;

  HAL_RTC_Init( &RtcHandle );
  
  /*Monday 1st January 2016*/
  RTC_DateStruct.Year = 0;
  RTC_DateStruct.Month = RTC_MONTH_JANUARY;
  RTC_DateStruct.Date = 1;
  RTC_DateStruct.WeekDay = RTC_WEEKDAY_MONDAY;
  HAL_RTC_SetDate(&RtcHandle , &RTC_DateStruct, RTC_FORMAT_BIN);
  
  /*at 0:0:0*/
  RTC_TimeStruct.Hours = 0;
  RTC_TimeStruct.Minutes = 0;

  RTC_TimeStruct.Seconds = 0;
  RTC_TimeStruct.TimeFormat = 0;
  RTC_TimeStruct.SubSeconds = 0;
  RTC_TimeStruct.StoreOperation = RTC_DAYLIGHTSAVING_NONE;
  RTC_TimeStruct.DayLightSaving = RTC_STOREOPERATION_RESET;
  
  HAL_RTC_SetTime(&RtcHandle , &RTC_TimeStruct, RTC_FORMAT_BIN);
  
 /*Enable Direct Read of the calendar registers (not through Shadow) */
  HAL_RTCEx_EnableBypassShadow(&RtcHandle);
}

/*!
 * @brief calculates the wake up time between wake up and mcu start
 * @note resulotion in RTC_ALARM_TIME_BASE in timer ticks
 * @param none
 * @retval none
 */
void HW_RTC_setMcuWakeUpTime( void )
{
  RTC_TimeTypeDef RTC_TimeStruct;
  RTC_DateTypeDef RTC_DateStruct;
  
  TimerTime_t now, hit;
  int16_t McuWakeUpTime;
  
  if ((McuWakeUpTimeInitialized == false) &&
      ( HAL_NVIC_GetPendingIRQ( RTC_Alarm_IRQn ) == 1))
  { /* warning: works ok if now is below 30 days
       it is ok since it's done once at first alarm wake-up*/
    McuWakeUpTimeInitialized = true;
    now = HW_RTC_GetCalendarValue( &RTC_DateStruct, &RTC_TimeStruct );

    DBG_GPIO_SET(GPIOB, GPIO_PIN_13);
    DBG_GPIO_RST(GPIOB, GPIO_PIN_13);
    HAL_RTC_GetAlarm(&RtcHandle, &RTC_AlarmStructure, RTC_ALARM_A, RTC_FORMAT_BIN );
    hit = RTC_AlarmStructure.AlarmTime.Seconds+
          60*(RTC_AlarmStructure.AlarmTime.Minutes+
          60*(RTC_AlarmStructure.AlarmTime.Hours+
          24*(RTC_AlarmStructure.AlarmDateWeekDay)));
    hit = ( hit << N_PREDIV_S ) + (PREDIV_S - RTC_AlarmStructure.AlarmTime.SubSeconds);
      
    McuWakeUpTime = (int16_t) ((now-hit));
    McuWakeUpTimeCal += McuWakeUpTime;
    DBG_PRINTF("Cal=%d, %d\n\r",McuWakeUpTimeCal, McuWakeUpTime);
  }
}

int16_t HW_RTC_getMcuWakeUpTime( void )
{
  return McuWakeUpTimeCal;
}

/*!
 * @brief returns the wake up time in ticks
 * @param none
 * @retval wake up time in ticks
 */
uint32_t HW_RTC_GetMinimumTimeout( void )
{
  return( MIN_ALARM_DELAY );
}

/*!
 * @brief converts time in ms to time in ticks
 * @param [IN] time in milliseconds
 * @retval returns time in timer ticks
 */
uint32_t HW_RTC_ms2Tick( TimerTime_t timeMicroSec )
{
/*return( ( timeMicroSec / RTC_ALARM_TIME_BASE ) ); */
  return ( uint32_t) ( ( ((uint64_t)timeMicroSec) * CONV_DENOM ) / CONV_NUMER );
}

/*!
 * @brief converts time in ticks to time in ms
 * @param [IN] time in timer ticks
 * @retval returns time in milliseconds
 */
TimerTime_t HW_RTC_Tick2ms( uint32_t tick )
{
/*return( ( timeMicroSec * RTC_ALARM_TIME_BASE ) ); */
  return  ( ( (uint64_t)( tick )* CONV_NUMER ) / CONV_DENOM );
}

/*!
 * @brief Set the alarm
 * @note The alarm is set at now (read in this funtion) + timeout
 * @param timeout Duration of the Timer ticks
 */
void HW_RTC_SetAlarm( uint32_t timeout )
{
  /* we don't go in Low Power mode for timeout below MIN_ALARM_DELAY */
  if ( (MIN_ALARM_DELAY + McuWakeUpTimeCal ) < ((timeout - HW_RTC_GetTimerElapsedTime( ) )) )
  {
    LowPower_Enable( e_LOW_POWER_RTC );
  }
  else
  {
    LowPower_Disable( e_LOW_POWER_RTC );
  }

  if( LowPower_GetState() == 0 )
  {
    LowPower_Enable( e_LOW_POWER_RTC );
    timeout = timeout -  McuWakeUpTimeCal;
  }

  HW_RTC_StartWakeUpAlarm( timeout );
}

/*!
 * @brief Get the RTC timer elapsed time since the last Alarm was set
 * @param none
 * @retval RTC Elapsed time in ticks
 */
uint32_t HW_RTC_GetTimerElapsedTime( void )
{
  RTC_TimeTypeDef RTC_TimeStruct;
  RTC_DateTypeDef RTC_DateStruct;
  
  TimerTime_t CalendarValue = HW_RTC_GetCalendarValue(&RTC_DateStruct, &RTC_TimeStruct );

  return( ( uint32_t )( CalendarValue - RtcTimerContext.Rtc_Time ));
}

/*!
 * @brief Get the RTC timer value
 * @param none
 * @retval RTC Timer value in ticks
 */
uint32_t HW_RTC_GetTimerValue( void )
{
  RTC_TimeTypeDef RTC_TimeStruct;
  RTC_DateTypeDef RTC_DateStruct;
  
  uint32_t CalendarValue = (uint32_t) HW_RTC_GetCalendarValue(&RTC_DateStruct, &RTC_TimeStruct );

  return( CalendarValue );
}

/*!
 * @brief Stop the Alarm
 * @param none
 * @retval none
 */
void HW_RTC_StopAlarm( void )
{

  /* Clear RTC Alarm Flag */
  __HAL_RTC_ALARM_CLEAR_FLAG( &RtcHandle, RTC_FLAG_ALRAF);

  /* Disable the Alarm A interrupt */

  HAL_RTC_DeactivateAlarm(&RtcHandle, RTC_ALARM_A );
}

/*!
 * @brief RTC IRQ Handler on the RTC Alarm
 * @param none
 * @retval none
 */
void HW_RTC_IrqHandler ( void )
{
  RTC_HandleTypeDef* hrtc=&RtcHandle;
  /* enable low power at irq*/
  LowPower_Enable( e_LOW_POWER_RTC );
  
    /* Get the AlarmA interrupt source enable status */
  if(__HAL_RTC_ALARM_GET_IT_SOURCE(hrtc, RTC_IT_ALRA) != RESET)
  {
    /* Get the pending status of the AlarmA Interrupt */
    if(__HAL_RTC_ALARM_GET_FLAG(hrtc, RTC_FLAG_ALRAF) != RESET)
    {
      /* Clear the AlarmA interrupt pending bit */
      __HAL_RTC_ALARM_CLEAR_FLAG(hrtc, RTC_FLAG_ALRAF); 
      /* Clear the EXTI's line Flag for RTC Alarm */
      __HAL_RTC_ALARM_EXTI_CLEAR_FLAG();
      /* AlarmA callback */
      HAL_RTC_AlarmAEventCallback(hrtc);
    }
  }
}


/*!
 * @brief a delay of delay ms by polling RTC
 * @param delay in ms
 * @retval none
 */
void HW_RTC_DelayMs( uint32_t delay )
{
  TimerTime_t delayValue = 0;
  TimerTime_t timeout = 0;

  delayValue = HW_RTC_ms2Tick( delay );

  /* Wait delay ms */
  timeout = HW_RTC_GetTimerValue( );
  while( ( ( HW_RTC_GetTimerValue( ) - timeout ) ) < delayValue )
  {
    __NOP( );
  }
}

/*!
 * @brief set Time Reference set also the RTC_DateStruct and RTC_TimeStruct
 * @param none
 * @retval Timer Value
 */
uint32_t HW_RTC_SetTimerContext( void )
{
  RtcTimerContext.Rtc_Time = HW_RTC_GetCalendarValue( &RtcTimerContext.RTC_Calndr_Date, &RtcTimerContext.RTC_Calndr_Time );
  return ( uint32_t ) RtcTimerContext.Rtc_Time;
}

/*!
 * @brief Get the RTC timer Reference
 * @param none
 * @retval Timer Value in  Ticks
 */
uint32_t HW_RTC_GetTimerContext( void )
{
  return (uint32_t) RtcTimerContext.Rtc_Time;
}
/* Private functions ---------------------------------------------------------*/

/*!
 * @brief configure alarm at init
 * @param none
 * @retval none
 */
static void HW_RTC_SetAlarmConfig( void )
{
  HAL_RTC_DeactivateAlarm(&RtcHandle, RTC_ALARM_A);
}

/*!
 * @brief start wake up alarm
 * @note  alarm in RtcTimerContext.Rtc_Time + timeoutValue
 * @param timeoutValue in ticks
 * @retval none
 */
static void HW_RTC_StartWakeUpAlarm( uint32_t timeoutValue )
{
  uint16_t rtcAlarmSubSeconds = 0;
  uint16_t rtcAlarmSeconds = 0;
  uint16_t rtcAlarmMinutes = 0;
  uint16_t rtcAlarmHours = 0;
  uint16_t rtcAlarmDays = 0;
  RTC_TimeTypeDef RTC_TimeStruct = RtcTimerContext.RTC_Calndr_Time;
  RTC_DateTypeDef RTC_DateStruct = RtcTimerContext.RTC_Calndr_Date;

  HW_RTC_StopAlarm( );
  DBG_GPIO_SET(GPIOB, GPIO_PIN_13);
  
  /*reverse counter */
  rtcAlarmSubSeconds =  PREDIV_S - RTC_TimeStruct.SubSeconds;
  rtcAlarmSubSeconds += ( timeoutValue & PREDIV_S);
  /* convert timeout  to seconds */
  timeoutValue >>= N_PREDIV_S;  /* convert timeout  in seconds */
  
  /*convert microsecs to RTC format and add to 'Now' */
  rtcAlarmDays =  RTC_DateStruct.Date;
  while (timeoutValue >= SECONDS_IN_1DAY)
  {
    timeoutValue -= SECONDS_IN_1DAY;
    rtcAlarmDays++;
  }
  
  /* calc hours */
  rtcAlarmHours = RTC_TimeStruct.Hours;
  while (timeoutValue >= SECONDS_IN_1HOUR)
  {
    timeoutValue -= SECONDS_IN_1HOUR;
    rtcAlarmHours++;
  }
  
  /* calc minutes */
  rtcAlarmMinutes = RTC_TimeStruct.Minutes;
  while (timeoutValue >= SECONDS_IN_1MINUTE)
  {
    timeoutValue -= SECONDS_IN_1MINUTE;
    rtcAlarmMinutes++;
  }
   
  /* calc seconds */
  rtcAlarmSeconds =  RTC_TimeStruct.Seconds + timeoutValue;

  /***** correct for modulo********/
  while (rtcAlarmSubSeconds >= (PREDIV_S+1))
  {
    rtcAlarmSubSeconds -= (PREDIV_S+1);
    rtcAlarmSeconds++;
  }
  
  while (rtcAlarmSeconds >= SECONDS_IN_1MINUTE)
  { 
    rtcAlarmSeconds -= SECONDS_IN_1MINUTE;
    rtcAlarmMinutes++;
  }

  while (rtcAlarmMinutes >= MINUTES_IN_1HOUR)
  {
    rtcAlarmMinutes -= MINUTES_IN_1HOUR;
    rtcAlarmHours++;
  }
  
  while (rtcAlarmHours >= HOURS_IN_1DAY)
  {
    rtcAlarmHours -= HOURS_IN_1DAY;
    rtcAlarmDays++;
  }

  if( RTC_DateStruct.Year % 4 == 0 ) 
  {
    if( rtcAlarmDays > DaysInMonthLeapYear[ RTC_DateStruct.Month - 1 ] )    
    {
      rtcAlarmDays = rtcAlarmDays % DaysInMonthLeapYear[ RTC_DateStruct.Month - 1 ];
    }
  }
  else
  {
    if( rtcAlarmDays > DaysInMonth[ RTC_DateStruct.Month - 1 ] )    
    {   
      rtcAlarmDays = rtcAlarmDays % DaysInMonth[ RTC_DateStruct.Month - 1 ];
    }
  }

  /* Set RTC_AlarmStructure with calculated values*/
  RTC_AlarmStructure.AlarmTime.SubSeconds = PREDIV_S-rtcAlarmSubSeconds;
  RTC_AlarmStructure.AlarmSubSecondMask  = HW_RTC_ALARMSUBSECONDMASK; 
  RTC_AlarmStructure.AlarmTime.Seconds = rtcAlarmSeconds;
  RTC_AlarmStructure.AlarmTime.Minutes = rtcAlarmMinutes;
  RTC_AlarmStructure.AlarmTime.Hours   = rtcAlarmHours;
  RTC_AlarmStructure.AlarmDateWeekDay    = ( uint8_t )rtcAlarmDays;
  RTC_AlarmStructure.AlarmTime.TimeFormat   = RTC_TimeStruct.TimeFormat;
  RTC_AlarmStructure.AlarmDateWeekDaySel   = RTC_ALARMDATEWEEKDAYSEL_DATE; 
  RTC_AlarmStructure.AlarmMask       = RTC_ALARMMASK_NONE;
  RTC_AlarmStructure.Alarm = RTC_ALARM_A;
  RTC_AlarmStructure.AlarmTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
  RTC_AlarmStructure.AlarmTime.StoreOperation = RTC_STOREOPERATION_RESET;
  
  /* Set RTC_Alarm */
  HAL_RTC_SetAlarm_IT( &RtcHandle, &RTC_AlarmStructure, RTC_FORMAT_BIN );
  
  /* Debug Printf*/
  DBG( HW_RTC_GetCalendarValue( &RTC_DateStruct, &RTC_TimeStruct ); );
  DBG_PRINTF("it's %d:%d:%d:%d ", RTC_TimeStruct.Hours, RTC_TimeStruct.Minutes, RTC_TimeStruct.Seconds, ((PREDIV_S - RTC_TimeStruct.SubSeconds)*1000)>>N_PREDIV_S);
  DBG_PRINTF("WU@ %d:%d:%d:%d\n\r", rtcAlarmHours, rtcAlarmMinutes, rtcAlarmSeconds, (rtcAlarmSubSeconds*1000)>>N_PREDIV_S );
  
  DBG_GPIO_RST(GPIOB, GPIO_PIN_13);
}


/*!
 * @brief get current time from calendar in ticks
 * @param pointer to RTC_DateStruct
 * @param pointer to RTC_TimeStruct
 * @retval time in ticks
 */
static TimerTime_t HW_RTC_GetCalendarValue( RTC_DateTypeDef* RTC_DateStruct, RTC_TimeTypeDef* RTC_TimeStruct )
{
  TimerTime_t calendarValue = 0;
  uint32_t first_read;
  uint32_t correction;
  
  /* Get Time and Date*/
  HAL_RTC_GetTime( &RtcHandle, RTC_TimeStruct, RTC_FORMAT_BIN );
 
   /* make sure it is correct due to asynchronus nature of RTC*/
  do {
    first_read = RTC_TimeStruct->SubSeconds;
    HAL_RTC_GetDate( &RtcHandle, RTC_DateStruct, RTC_FORMAT_BIN );
    HAL_RTC_GetTime( &RtcHandle, RTC_TimeStruct, RTC_FORMAT_BIN );
  } while (first_read != RTC_TimeStruct->SubSeconds);
 
  /* calculte amount of elapsed days since 01/01/2000 */
  calendarValue= DIVC( (DAYS_IN_YEAR*3 + DAYS_IN_LEAP_YEAR)* RTC_DateStruct->Year , 4);

  correction = ( (RTC_DateStruct->Year % 4) == 0 ) ? DAYS_IN_MONTH_CORRECTION_LEAP : DAYS_IN_MONTH_CORRECTION_NORM ;
 
  calendarValue +=( DIVC( (RTC_DateStruct->Month-1)*(30+31) ,2 ) - (((correction>> ((RTC_DateStruct->Month-1)*2) )&0x3)));

  calendarValue += (RTC_DateStruct->Date -1);
  
  /* convert from days to seconds */
  calendarValue *= SECONDS_IN_1DAY; 

  calendarValue += ( ( uint32_t )RTC_TimeStruct->Seconds + 
                     ( ( uint32_t )RTC_TimeStruct->Minutes * SECONDS_IN_1MINUTE ) +
                     ( ( uint32_t )RTC_TimeStruct->Hours * SECONDS_IN_1HOUR ) ) ;


  
  calendarValue = (calendarValue<<N_PREDIV_S) + ( PREDIV_S - RTC_TimeStruct->SubSeconds);

  return( calendarValue );
}


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