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/**

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

  * @file    stm32f1xx_ll_rtc.c

  * @author  MCD Application Team

  * @brief   RTC LL module driver.

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

  * @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.

  *

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

  */

#if defined(USE_FULL_LL_DRIVER)

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

#include "stm32f1xx_ll_rtc.h"

#include "stm32f1xx_ll_cortex.h"

#ifdef  USE_FULL_ASSERT

#include "stm32_assert.h"

#else

#define assert_param(expr) ((void)0U)

#endif

/** @addtogroup STM32F1xx_LL_Driver

  * @{

  */

#if defined(RTC)

/** @addtogroup RTC_LL

  * @{

  */

/* Private types -------------------------------------------------------------*/

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

/* Private constants ---------------------------------------------------------*/

/** @addtogroup RTC_LL_Private_Constants

  * @{

  */

/* Default values used for prescaler */

#define RTC_ASYNCH_PRESC_DEFAULT     0x00007FFFU

/* Values used for timeout */

#define RTC_INITMODE_TIMEOUT         1000U /* 1s when tick set to 1ms */

#define RTC_SYNCHRO_TIMEOUT          1000U /* 1s when tick set to 1ms */

/**

  * @}

  */

/* Private macros ------------------------------------------------------------*/

/** @addtogroup RTC_LL_Private_Macros

  * @{

  */

#define IS_LL_RTC_ASYNCH_PREDIV(__VALUE__)   ((__VALUE__) <= 0xFFFFFU)

#define IS_LL_RTC_FORMAT(__VALUE__) (((__VALUE__) == LL_RTC_FORMAT_BIN) \

                                  || ((__VALUE__) == LL_RTC_FORMAT_BCD))

#define IS_LL_RTC_HOUR24(__HOUR__)            ((__HOUR__) <= 23U)

#define IS_LL_RTC_MINUTES(__MINUTES__)        ((__MINUTES__) <= 59U)

#define IS_LL_RTC_SECONDS(__SECONDS__)        ((__SECONDS__) <= 59U)

#define IS_LL_RTC_CALIB_OUTPUT(__OUTPUT__) (((__OUTPUT__) == LL_RTC_CALIB_OUTPUT_NONE) || \

                                            ((__OUTPUT__) == LL_RTC_CALIB_OUTPUT_RTCCLOCK) || \

                                            ((__OUTPUT__) == LL_RTC_CALIB_OUTPUT_ALARM) || \

                                            ((__OUTPUT__) == LL_RTC_CALIB_OUTPUT_SECOND))

/**

  * @}

  */

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

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

/** @addtogroup RTC_LL_Exported_Functions

  * @{

  */

/** @addtogroup RTC_LL_EF_Init

  * @{

  */

/**

  * @brief  De-Initializes the RTC registers to their default reset values.

  * @note   This function doesn't reset the RTC Clock source and RTC Backup Data

  *         registers.

  * @param  RTCx RTC Instance

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC registers are de-initialized

  *          - ERROR: RTC registers are not de-initialized

  */

ErrorStatus LL_RTC_DeInit(RTC_TypeDef *RTCx)

{

  ErrorStatus status = ERROR;

  /* Check the parameter */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  /* Disable the write protection for RTC registers */

  LL_RTC_DisableWriteProtection(RTCx);

  /* Set Initialization mode */

  if (LL_RTC_EnterInitMode(RTCx) != ERROR)

  {

    LL_RTC_WriteReg(RTCx, CNTL, 0x0000);

    LL_RTC_WriteReg(RTCx, CNTH, 0x0000);

    LL_RTC_WriteReg(RTCx, PRLH, 0x0000);

    LL_RTC_WriteReg(RTCx, PRLL, 0x8000);

    LL_RTC_WriteReg(RTCx, CRH,  0x0000);

    LL_RTC_WriteReg(RTCx, CRL,  0x0020);

    /* Reset Tamper and alternate functions configuration register */

    LL_RTC_WriteReg(BKP, RTCCR, 0x00000000U);

    LL_RTC_WriteReg(BKP, CR,    0x00000000U);

    LL_RTC_WriteReg(BKP, CSR,   0x00000000U);

    /* Exit Initialization Mode */

    if (LL_RTC_ExitInitMode(RTCx) != ERROR)

    {

      /* Wait till the RTC RSF flag is set */

      status = LL_RTC_WaitForSynchro(RTCx);

      /* Clear RSF Flag */

      LL_RTC_ClearFlag_RS(RTCx);

      /* Enable the write protection for RTC registers */

      LL_RTC_EnableWriteProtection(RTCx);

    }

  }

  else

  {

    /* Enable the write protection for RTC registers */

    LL_RTC_EnableWriteProtection(RTCx);

  }

  return status;

}

/**

  * @brief  Initializes the RTC registers according to the specified parameters

  *         in RTC_InitStruct.

  * @param  RTCx RTC Instance

  * @param  RTC_InitStruct pointer to a @ref LL_RTC_InitTypeDef structure that contains

  *         the configuration information for the RTC peripheral.

  * @note   The RTC Prescaler register is write protected and can be written in

  *         initialization mode only.

  * @note   the user should call LL_RTC_StructInit()  or the structure of Prescaler

  *         need to be initialized  before RTC init()

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC registers are initialized

  *          - ERROR: RTC registers are not initialized

  */

ErrorStatus LL_RTC_Init(RTC_TypeDef *RTCx, LL_RTC_InitTypeDef *RTC_InitStruct)

{

  ErrorStatus status = ERROR;

  /* Check the parameters */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  assert_param(IS_LL_RTC_ASYNCH_PREDIV(RTC_InitStruct->AsynchPrescaler));

  assert_param(IS_LL_RTC_CALIB_OUTPUT(RTC_InitStruct->OutPutSource));

  /* Waiting for synchro */

  if (LL_RTC_WaitForSynchro(RTCx) != ERROR)

  {

    /* Set Initialization mode */

    if (LL_RTC_EnterInitMode(RTCx) != ERROR)

    {

      /* Clear Flag Bits */

      LL_RTC_ClearFlag_ALR(RTCx);

      LL_RTC_ClearFlag_OW(RTCx);

      LL_RTC_ClearFlag_SEC(RTCx);

      if (RTC_InitStruct->OutPutSource != LL_RTC_CALIB_OUTPUT_NONE)

      {

        /* Disable the selected Tamper Pin */

        LL_RTC_TAMPER_Disable(BKP);

      }

      /* Set the signal which will be routed to RTC Tamper Pin */

      LL_RTC_SetOutputSource(BKP, RTC_InitStruct->OutPutSource);

      /* Configure Synchronous and Asynchronous prescaler factor */

      LL_RTC_SetAsynchPrescaler(RTCx, RTC_InitStruct->AsynchPrescaler);

      /* Exit Initialization Mode */

      LL_RTC_ExitInitMode(RTCx);

      status = SUCCESS;

    }

  }

  return status;

}

/**

  * @brief  Set each @ref LL_RTC_InitTypeDef field to default value.

  * @param  RTC_InitStruct pointer to a @ref LL_RTC_InitTypeDef structure which will be initialized.

  * @retval None

  */

void LL_RTC_StructInit(LL_RTC_InitTypeDef *RTC_InitStruct)

{

  /* Set RTC_InitStruct fields to default values */

  RTC_InitStruct->AsynchPrescaler = RTC_ASYNCH_PRESC_DEFAULT;

  RTC_InitStruct->OutPutSource    = LL_RTC_CALIB_OUTPUT_NONE;

}

/**

  * @brief  Set the RTC current time.

  * @param  RTCx RTC Instance

  * @param  RTC_Format This parameter can be one of the following values:

  *         @arg @ref LL_RTC_FORMAT_BIN

  *         @arg @ref LL_RTC_FORMAT_BCD

  * @param  RTC_TimeStruct pointer to a RTC_TimeTypeDef structure that contains

  *                        the time configuration information for the RTC.

  * @note  The user should call LL_RTC_TIME_StructInit() or the structure

  *        of time need to be initialized  before time init()

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC Time register is configured

  *          - ERROR: RTC Time register is not configured

  */

ErrorStatus LL_RTC_TIME_Init(RTC_TypeDef *RTCx, uint32_t RTC_Format, LL_RTC_TimeTypeDef *RTC_TimeStruct)

{

  ErrorStatus status = ERROR;

  uint32_t counter_time = 0U;

  /* Check the parameters */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  assert_param(IS_LL_RTC_FORMAT(RTC_Format));

  if (RTC_Format == LL_RTC_FORMAT_BIN)

  {

    assert_param(IS_LL_RTC_HOUR24(RTC_TimeStruct->Hours));

    assert_param(IS_LL_RTC_MINUTES(RTC_TimeStruct->Minutes));

    assert_param(IS_LL_RTC_SECONDS(RTC_TimeStruct->Seconds));

  }

  else

  {

    assert_param(IS_LL_RTC_HOUR24(__LL_RTC_CONVERT_BCD2BIN(RTC_TimeStruct->Hours)));

    assert_param(IS_LL_RTC_MINUTES(__LL_RTC_CONVERT_BCD2BIN(RTC_TimeStruct->Minutes)));

    assert_param(IS_LL_RTC_SECONDS(__LL_RTC_CONVERT_BCD2BIN(RTC_TimeStruct->Seconds)));

  }

  /* Enter Initialization mode */

  if (LL_RTC_EnterInitMode(RTCx) != ERROR)

  {

    /* Check the input parameters format */

    if (RTC_Format == LL_RTC_FORMAT_BIN)

    {

      counter_time = (uint32_t)(((uint32_t)RTC_TimeStruct->Hours * 3600U) + \

                                ((uint32_t)RTC_TimeStruct->Minutes * 60U) + \

                                ((uint32_t)RTC_TimeStruct->Seconds));

      LL_RTC_TIME_Set(RTCx, counter_time);

    }

    else

    {

      counter_time = (((uint32_t)(__LL_RTC_CONVERT_BCD2BIN(RTC_TimeStruct->Hours)) * 3600U) + \

                      ((uint32_t)(__LL_RTC_CONVERT_BCD2BIN(RTC_TimeStruct->Minutes)) * 60U) + \

                      ((uint32_t)(__LL_RTC_CONVERT_BCD2BIN(RTC_TimeStruct->Seconds))));

      LL_RTC_TIME_Set(RTCx, counter_time);

    }

    status = SUCCESS;

  }

  /* Exit Initialization mode */

  LL_RTC_ExitInitMode(RTCx);

  return status;

}

/**

  * @brief  Set each @ref LL_RTC_TimeTypeDef field to default value (Time = 00h:00min:00sec).

  * @param  RTC_TimeStruct pointer to a @ref LL_RTC_TimeTypeDef structure which will be initialized.

  * @retval None

  */

void LL_RTC_TIME_StructInit(LL_RTC_TimeTypeDef *RTC_TimeStruct)

{

  /* Time = 00h:00min:00sec */

  RTC_TimeStruct->Hours      = 0U;

  RTC_TimeStruct->Minutes    = 0U;

  RTC_TimeStruct->Seconds    = 0U;

}

/**

  * @brief  Set the RTC Alarm.

  * @param  RTCx RTC Instance

  * @param  RTC_Format This parameter can be one of the following values:

  *         @arg @ref LL_RTC_FORMAT_BIN

  *         @arg @ref LL_RTC_FORMAT_BCD

  * @param  RTC_AlarmStruct pointer to a @ref LL_RTC_AlarmTypeDef structure that

  *                         contains the alarm configuration parameters.

  * @note   the user should call LL_RTC_ALARM_StructInit()  or the structure

  *         of Alarm need to be initialized  before Alarm init()

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: ALARM registers are configured

  *          - ERROR: ALARM registers are not configured

  */

ErrorStatus LL_RTC_ALARM_Init(RTC_TypeDef *RTCx, uint32_t RTC_Format, LL_RTC_AlarmTypeDef *RTC_AlarmStruct)

{

  ErrorStatus status = ERROR;

  uint32_t counter_alarm = 0U;

  /* Check the parameters */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  assert_param(IS_LL_RTC_FORMAT(RTC_Format));

  if (RTC_Format == LL_RTC_FORMAT_BIN)

  {

    assert_param(IS_LL_RTC_HOUR24(RTC_AlarmStruct->AlarmTime.Hours));

    assert_param(IS_LL_RTC_MINUTES(RTC_AlarmStruct->AlarmTime.Minutes));

    assert_param(IS_LL_RTC_SECONDS(RTC_AlarmStruct->AlarmTime.Seconds));

  }

  else

  {

    assert_param(IS_LL_RTC_HOUR24(__LL_RTC_CONVERT_BCD2BIN(RTC_AlarmStruct->AlarmTime.Hours)));

    assert_param(IS_LL_RTC_MINUTES(__LL_RTC_CONVERT_BCD2BIN(RTC_AlarmStruct->AlarmTime.Minutes)));

    assert_param(IS_LL_RTC_SECONDS(__LL_RTC_CONVERT_BCD2BIN(RTC_AlarmStruct->AlarmTime.Seconds)));

  }

  /* Enter Initialization mode */

  if (LL_RTC_EnterInitMode(RTCx) != ERROR)

  {

    /* Check the input parameters format */

    if (RTC_Format == LL_RTC_FORMAT_BIN)

    {

      counter_alarm = (uint32_t)(((uint32_t)RTC_AlarmStruct->AlarmTime.Hours * 3600U) + \

                                 ((uint32_t)RTC_AlarmStruct->AlarmTime.Minutes * 60U) + \

                                 ((uint32_t)RTC_AlarmStruct->AlarmTime.Seconds));

      LL_RTC_ALARM_Set(RTCx, counter_alarm);

    }

    else

    {

      counter_alarm = (((uint32_t)(__LL_RTC_CONVERT_BCD2BIN(RTC_AlarmStruct->AlarmTime.Hours)) * 3600U) + \

                       ((uint32_t)(__LL_RTC_CONVERT_BCD2BIN(RTC_AlarmStruct->AlarmTime.Minutes)) * 60U) + \

                       ((uint32_t)(__LL_RTC_CONVERT_BCD2BIN(RTC_AlarmStruct->AlarmTime.Seconds))));

      LL_RTC_ALARM_Set(RTCx, counter_alarm);

    }

    status = SUCCESS;

  }

  /* Exit Initialization mode */

  LL_RTC_ExitInitMode(RTCx);

  return status;

}

/**

  * @brief  Set each @ref LL_RTC_AlarmTypeDef of ALARM field to default value (Time = 00h:00mn:00sec /

  *         Day = 1st day of the month/Mask = all fields are masked).

  * @param  RTC_AlarmStruct pointer to a @ref LL_RTC_AlarmTypeDef structure which will be initialized.

  * @retval None

  */

void LL_RTC_ALARM_StructInit(LL_RTC_AlarmTypeDef *RTC_AlarmStruct)

{

  /* Alarm Time Settings : Time = 00h:00mn:00sec */

  RTC_AlarmStruct->AlarmTime.Hours      = 0U;

  RTC_AlarmStruct->AlarmTime.Minutes    = 0U;

  RTC_AlarmStruct->AlarmTime.Seconds    = 0U;

}

/**

  * @brief  Enters the RTC Initialization mode.

  * @param  RTCx RTC Instance

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC is in Init mode

  *          - ERROR: RTC is not in Init mode

  */

ErrorStatus LL_RTC_EnterInitMode(RTC_TypeDef *RTCx)

{

  __IO uint32_t timeout = RTC_INITMODE_TIMEOUT;

  ErrorStatus status = SUCCESS;

  uint32_t tmp = 0U;

  /* Check the parameter */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  /* Wait till RTC is in INIT state and if Time out is reached exit */

  tmp = LL_RTC_IsActiveFlag_RTOF(RTCx);

  while ((timeout != 0U) && (tmp != 1U))

  {

    if (LL_SYSTICK_IsActiveCounterFlag() == 1U)

    {

      timeout --;

    }

    tmp = LL_RTC_IsActiveFlag_RTOF(RTCx);

    if (timeout == 0U)

    {

      status = ERROR;

    }

  }

  /* Disable the write protection for RTC registers */

  LL_RTC_DisableWriteProtection(RTCx);

  return status;

}

/**

  * @brief  Exit the RTC Initialization mode.

  * @note   When the initialization sequence is complete, the calendar restarts

  *         counting after 4 RTCCLK cycles.

  * @param  RTCx RTC Instance

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC exited from in Init mode

  *          - ERROR: Not applicable

  */

ErrorStatus LL_RTC_ExitInitMode(RTC_TypeDef *RTCx)

{

  __IO uint32_t timeout = RTC_INITMODE_TIMEOUT;

  ErrorStatus status = SUCCESS;

  uint32_t tmp = 0U;

  /* Check the parameter */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  /* Disable initialization mode */

  LL_RTC_EnableWriteProtection(RTCx);

  /* Wait till RTC is in INIT state and if Time out is reached exit */

  tmp = LL_RTC_IsActiveFlag_RTOF(RTCx);

  while ((timeout != 0U) && (tmp != 1U))

  {

    if (LL_SYSTICK_IsActiveCounterFlag() == 1U)

    {

      timeout --;

    }

    tmp = LL_RTC_IsActiveFlag_RTOF(RTCx);

    if (timeout == 0U)

    {

      status = ERROR;

    }

  }

  return status;

}

/**

  * @brief  Set the Time Counter

  * @param  RTCx RTC Instance

  * @param  TimeCounter this value can be from 0 to 0xFFFFFFFF

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC Counter register configured

  *          - ERROR: Not applicable

  */

ErrorStatus LL_RTC_TIME_SetCounter(RTC_TypeDef *RTCx, uint32_t TimeCounter)

{

  ErrorStatus status = ERROR;

  /* Check the parameter */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  /* Enter Initialization mode */

  if (LL_RTC_EnterInitMode(RTCx) != ERROR)

  {

    LL_RTC_TIME_Set(RTCx, TimeCounter);

    status = SUCCESS;

  }

  /* Exit Initialization mode */

  LL_RTC_ExitInitMode(RTCx);

  return status;

}

/**

  * @brief  Set Alarm Counter.

  * @param  RTCx RTC Instance

  * @param  AlarmCounter this value can be from 0 to 0xFFFFFFFF

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC exited from in Init mode

  *          - ERROR: Not applicable

  */

ErrorStatus LL_RTC_ALARM_SetCounter(RTC_TypeDef *RTCx, uint32_t AlarmCounter)

{

  ErrorStatus status = ERROR;

  /* Check the parameter */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  /* Enter Initialization mode */

  if (LL_RTC_EnterInitMode(RTCx) != ERROR)

  {

    LL_RTC_ALARM_Set(RTCx, AlarmCounter);

    status = SUCCESS;

  }

  /* Exit Initialization mode */

  LL_RTC_ExitInitMode(RTCx);

  return status;

}

/**

  * @brief  Waits until the RTC registers are synchronized with RTC APB clock.

  * @note   The RTC Resynchronization mode is write protected, use the

  *         @ref LL_RTC_DisableWriteProtection before calling this function.

  * @param  RTCx RTC Instance

  * @retval An ErrorStatus enumeration value:

  *          - SUCCESS: RTC registers are synchronised

  *          - ERROR: RTC registers are not synchronised

  */

ErrorStatus LL_RTC_WaitForSynchro(RTC_TypeDef *RTCx)

{

  __IO uint32_t timeout = RTC_SYNCHRO_TIMEOUT;

  ErrorStatus status = SUCCESS;

  uint32_t tmp = 0U;

  /* Check the parameter */

  assert_param(IS_RTC_ALL_INSTANCE(RTCx));

  /* Clear RSF flag */

  LL_RTC_ClearFlag_RS(RTCx);

  /* Wait the registers to be synchronised */

  tmp = LL_RTC_IsActiveFlag_RS(RTCx);

  while ((timeout != 0U) && (tmp != 0U))

  {

    if (LL_SYSTICK_IsActiveCounterFlag() == 1U)

    {

      timeout--;

    }

    tmp = LL_RTC_IsActiveFlag_RS(RTCx);

    if (timeout == 0U)

    {

      status = ERROR;

    }

  }

  return (status);

}

/**

  * @}

  */

/**

  * @}

  */

/**

  * @}

  */

#endif /* defined(RTC) */

/**

  * @}

  */

#endif /* USE_FULL_LL_DRIVER */