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/**

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

  * @file    stm32f1xx_hal_wwdg.c

  * @author  MCD Application Team

  * @version V1.0.1

  * @date    31-July-2015

  * @brief   WWDG HAL module driver.

  *          This file provides firmware functions to manage the following

  *          functionalities of the Window Watchdog (WWDG) peripheral:

  *           + Initialization and de-initialization functions

  *           + IO operation functions

  *           + Peripheral State functions      

  *        

  @verbatim

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

                      ##### WWDG specific features #####

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

  [..]

    Once enabled the WWDG generates a system reset on expiry of a programmed

    time period, unless the program refreshes the Counter (T[6;0] downcounter)

    before reaching 0x3F value (i.e. a reset is generated when the counter

    value rolls over from 0x40 to 0x3F).

    (+) An MCU reset is also generated if the counter value is refreshed

        before the counter has reached the refresh window value. This

        implies that the counter must be refreshed in a limited window.

    (+) Once enabled the WWDG cannot be disabled except by a system reset.

    (+) WWDGRST flag in RCC_CSR register can be used to inform when a WWDG

        reset occurs.              

    (+) The WWDG counter input clock is derived from the APB clock divided

        by a programmable prescaler.

    (+) WWDG clock (Hz) = PCLK / (4096 * Prescaler)

    (+) WWDG timeout (mS) = 1000 * (T[5;0] + 1) / WWDG clock

        where T[5;0] are the lowest 6 bits of Counter.

    (+) WWDG Counter refresh is allowed between the following limits :

        (++) min time (mS) = 1000 * (Counter - Window) / WWDG clock

        (++) max time (mS) = 1000 * (Counter - 0x40) / WWDG clock

    (+) Min-max timeout value @48 MHz(PCLK): ~85,3us / ~5,46 ms

                     ##### How to use this driver #####

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

  [..]

    (+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE().

    (+) Set the WWDG prescaler, refresh window and counter value

        using HAL_WWDG_Init() function.

    (+) Start the WWDG using HAL_WWDG_Start() function.

        When the WWDG is enabled the counter value should be configured to

        a value greater than 0x40 to prevent generating an immediate reset.

    (+) Optionally you can enable the Early Wakeup Interrupt (EWI) which is

        generated when the counter reaches 0x40, and then start the WWDG using

        HAL_WWDG_Start_IT(). At EWI HAL_WWDG_WakeupCallback is executed and user can

        add his own code by customization of function pointer HAL_WWDG_WakeupCallback

        Once enabled, EWI interrupt cannot be disabled except by a system reset.          

    (+) Then the application program must refresh the WWDG counter at regular

        intervals during normal operation to prevent an MCU reset, using

        HAL_WWDG_Refresh() function. This operation must occur only when

        the counter is lower than the refresh window value already programmed.

     *** WWDG HAL driver macros list ***

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

     [..]

       Below the list of most used macros in WWDG HAL driver.

      (+) __HAL_WWDG_ENABLE: Enable the WWDG peripheral

      (+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status

      (+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags

      (+) __HAL_WWDG_ENABLE_IT:  Enables the WWDG early wakeup interrupt

  @endverbatim

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

  * @attention

  *

  * <h2><center>&copy; COPYRIGHT(c) 2015 STMicroelectronics</center></h2>

  *

  * Redistribution and use in source and binary forms, with or without modification,

  * are permitted provided that the following conditions are met:

  *   1. Redistributions 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 its contributors

  *      may be used to endorse or promote products derived from this software

  *      without specific prior written permission.

  *

  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  *

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

  */

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

#include "stm32f1xx_hal.h"

/** @addtogroup STM32F1xx_HAL_Driver

  * @{

  */

/** @defgroup WWDG WWDG

  * @brief WWDG HAL module driver.

  * @{

  */

#ifdef HAL_WWDG_MODULE_ENABLED

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

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

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

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

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

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

/** @defgroup WWDG_Exported_Functions WWDG Exported Functions

  * @{

  */

/** @defgroup WWDG_Exported_Functions_Group1 Initialization and de-initialization functions

 *  @brief    Initialization and Configuration functions.

 *

@verbatim      

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

          ##### Initialization and de-initialization functions #####

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

  [..]  

    This section provides functions allowing to:

    (+) Initialize the WWDG according to the specified parameters

        in the WWDG_InitTypeDef and create the associated handle

    (+) DeInitialize the WWDG peripheral

    (+) Initialize the WWDG MSP

    (+) DeInitialize the WWDG MSP

@endverbatim

  * @{

  */

/**

  * @brief  Initializes the WWDG according to the specified

  *         parameters in the WWDG_InitTypeDef and creates the associated handle.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_WWDG_Init(WWDG_HandleTypeDef *hwwdg)

{

  /* Check the WWDG handle allocation */

  if(hwwdg == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));

  assert_param(IS_WWDG_PRESCALER(hwwdg->Init.Prescaler));

  assert_param(IS_WWDG_WINDOW(hwwdg->Init.Window));

  assert_param(IS_WWDG_COUNTER(hwwdg->Init.Counter));

  if(hwwdg->State == HAL_WWDG_STATE_RESET)

  {

    /* Allocate lock resource and initialize it */

    hwwdg->Lock = HAL_UNLOCKED;

    /* Init the low level hardware */

    HAL_WWDG_MspInit(hwwdg);

  }

  /* Change WWDG peripheral state */

  hwwdg->State = HAL_WWDG_STATE_BUSY;

  /* Set WWDG Prescaler and Window */

  MODIFY_REG(hwwdg->Instance->CFR, (WWDG_CFR_WDGTB | WWDG_CFR_W), (hwwdg->Init.Prescaler | hwwdg->Init.Window));

  /* Set WWDG Counter */

  MODIFY_REG(hwwdg->Instance->CR, WWDG_CR_T, hwwdg->Init.Counter);

  /* Change WWDG peripheral state */

  hwwdg->State = HAL_WWDG_STATE_READY;

  /* Return function status */

  return HAL_OK;

}

/**

  * @brief  DeInitializes the WWDG peripheral.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_WWDG_DeInit(WWDG_HandleTypeDef *hwwdg)

{

  /* Check the WWDG handle allocation */

  if(hwwdg == NULL)

  {

    return HAL_ERROR;

  }

  /* Check the parameters */

  assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));

  /* Change WWDG peripheral state */  

  hwwdg->State = HAL_WWDG_STATE_BUSY;

  /* DeInit the low level hardware */

  HAL_WWDG_MspDeInit(hwwdg);

  /* Reset WWDG Control register */

  hwwdg->Instance->CR  = (uint32_t)0x0000007F;

  /* Reset WWDG Configuration register */

  hwwdg->Instance->CFR = (uint32_t)0x0000007F;

  /* Reset WWDG Status register */

  hwwdg->Instance->SR  = 0;

  /* Change WWDG peripheral state */    

  hwwdg->State = HAL_WWDG_STATE_RESET;

  /* Release Lock */

  __HAL_UNLOCK(hwwdg);

  /* Return function status */

  return HAL_OK;

}

/**

  * @brief  Initializes the WWDG MSP.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval None

  */

__weak void HAL_WWDG_MspInit(WWDG_HandleTypeDef *hwwdg)

{

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

           the HAL_WWDG_MspInit could be implemented in the user file

   */

}

/**

  * @brief  DeInitializes the WWDG MSP.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval None

  */

__weak void HAL_WWDG_MspDeInit(WWDG_HandleTypeDef *hwwdg)

{

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

           the HAL_WWDG_MspDeInit could be implemented in the user file

   */

}

/**

  * @}

  */

/** @defgroup WWDG_Exported_Functions_Group2 IO operation functions  

 *  @brief   IO operation functions  

 *

@verbatim  

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

                       ##### IO operation functions #####

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

  [..]  

    This section provides functions allowing to:

    (+) Start the WWDG.

    (+) Refresh the WWDG.

    (+) Handle WWDG interrupt request.

@endverbatim

  * @{

  */

/**

  * @brief  Starts the WWDG.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_WWDG_Start(WWDG_HandleTypeDef *hwwdg)

{

  /* Process Locked */

  __HAL_LOCK(hwwdg);

  /* Change WWDG peripheral state */  

  hwwdg->State = HAL_WWDG_STATE_BUSY;

  /* Enable the peripheral */

  __HAL_WWDG_ENABLE(hwwdg);  

  /* Change WWDG peripheral state */    

  hwwdg->State = HAL_WWDG_STATE_READY;

  /* Process Unlocked */

  __HAL_UNLOCK(hwwdg);

  /* Return function status */

  return HAL_OK;

}

/**

  * @brief  Starts the WWDG with interrupt enabled.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_WWDG_Start_IT(WWDG_HandleTypeDef *hwwdg)

{

  /* Process Locked */

  __HAL_LOCK(hwwdg);

  /* Change WWDG peripheral state */  

  hwwdg->State = HAL_WWDG_STATE_BUSY;

  /* Enable the Early Wakeup Interrupt */

  __HAL_WWDG_ENABLE_IT(hwwdg, WWDG_IT_EWI);

  /* Enable the peripheral */

  __HAL_WWDG_ENABLE(hwwdg);  

  /* Return function status */

  return HAL_OK;

}

/**

  * @brief  Refreshes the WWDG.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @param  Counter: value of counter to put in WWDG counter

  * @retval HAL status

  */

HAL_StatusTypeDef HAL_WWDG_Refresh(WWDG_HandleTypeDef *hwwdg, uint32_t Counter)

{

  /* Process Locked */

  __HAL_LOCK(hwwdg);

  /* Change WWDG peripheral state */  

  hwwdg->State = HAL_WWDG_STATE_BUSY;

  /* Check the parameters */

  assert_param(IS_WWDG_COUNTER(Counter));

  /* Write to WWDG CR the WWDG Counter value to refresh with */

  MODIFY_REG(hwwdg->Instance->CR, (uint32_t)WWDG_CR_T, Counter);

  /* Change WWDG peripheral state */    

  hwwdg->State = HAL_WWDG_STATE_READY;

  /* Process Unlocked */

  __HAL_UNLOCK(hwwdg);

  /* Return function status */

  return HAL_OK;

}

/**

  * @brief  Handles WWDG interrupt request.

  * @note   The Early Wakeup Interrupt (EWI) can be used if specific safety operations

  *         or data logging must be performed before the actual reset is generated.

  *         The EWI interrupt is enabled when calling HAL_WWDG_Start_IT function.

  *         When the downcounter reaches the value 0x40, and EWI interrupt is

  *         generated and the corresponding Interrupt Service Routine (ISR) can

  *         be used to trigger specific actions (such as communications or data

  *         logging), before resetting the device.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval None

  */

void HAL_WWDG_IRQHandler(WWDG_HandleTypeDef *hwwdg)

{

  /* Check if Early Wakeup Interrupt is enable */

  if(__HAL_WWDG_GET_IT_SOURCE(hwwdg, WWDG_IT_EWI) != RESET)

  {

    /* Wheck if WWDG Early Wakeup Interrupt occurred */

  if(__HAL_WWDG_GET_FLAG(hwwdg, WWDG_FLAG_EWIF) != RESET)

  {

    /* Early Wakeup callback */

    HAL_WWDG_WakeupCallback(hwwdg);

    /* Change WWDG peripheral state */

    hwwdg->State = HAL_WWDG_STATE_READY;

      /* Clear the WWDG Early Wakeup flag */

    __HAL_WWDG_CLEAR_FLAG(hwwdg, WWDG_FLAG_EWIF);

    /* Process Unlocked */

    __HAL_UNLOCK(hwwdg);

  }

}

}

/**

  * @brief  Early Wakeup WWDG callback.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval None

  */

__weak void HAL_WWDG_WakeupCallback(WWDG_HandleTypeDef* hwwdg)

{

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

           the HAL_WWDG_WakeupCallback could be implemented in the user file

   */

}

/**

  * @}

  */

/** @defgroup WWDG_Exported_Functions_Group3 Peripheral State functions

 *  @brief    Peripheral State functions.

 *

@verbatim  

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

                        ##### Peripheral State functions #####

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

  [..]

    This subsection permits to get in run-time the status of the peripheral

    and the data flow.

@endverbatim

  * @{

  */

/**

  * @brief  Returns the WWDG state.

  * @param  hwwdg: pointer to a WWDG_HandleTypeDef structure that contains

  *              the configuration information for the specified WWDG module.

  * @retval HAL state

  */

HAL_WWDG_StateTypeDef HAL_WWDG_GetState(WWDG_HandleTypeDef *hwwdg)

{

  return hwwdg->State;

}

/**

  * @}

  */

/**

  * @}

  */

#endif /* HAL_WWDG_MODULE_ENABLED */

/**

  * @}

  */

/**

  * @}

  */

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