Diff: targets/cmsis/TARGET_STM/TARGET_STM32F7/stm32f7xx_hal_wwdg.c

Revision:

144:ef7eb2e8f9f7

Parent:

83:a036322b8637

--- a/targets/cmsis/TARGET_STM/TARGET_STM32F7/stm32f7xx_hal_wwdg.c	Tue Aug 02 14:07:36 2016 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32F7/stm32f7xx_hal_wwdg.c	Fri Sep 02 15:07:44 2016 +0100
@@ -1,463 +1,322 @@
-/**
-  ******************************************************************************
-  * @file    stm32f7xx_hal_wwdg.c
-  * @author  MCD Application Team
-  * @version V1.0.4
-  * @date    09-December-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 (down-counter) 
-    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) = PCLK1 / (4096 * Prescaler)
-    (+) WWDG timeout (mS) = 1000 * Counter / WWDG clock
-    (+) 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 at 50 MHz(PCLK1): 81.9 us / 41.9 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 wake-up 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 "stm32f7xx_hal.h"
-
-/** @addtogroup STM32F7xx_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)
-{
-  /* Prevent unused argument(s) compilation warning */
-  UNUSED(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)
-{
-  /* Prevent unused argument(s) compilation warning */
-  UNUSED(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 using __HAL_WWDG_ENABLE_IT() macro.
-  *         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)
-  {
-    /* Check 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)
-{
-  /* Prevent unused argument(s) compilation warning */
-  UNUSED(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****/
+/**
+  ******************************************************************************
+  * @file    stm32f7xx_hal_wwdg.c
+  * @author  MCD Application Team
+  * @version V1.1.0
+  * @date    22-April-2016
+  * @brief   WWDG HAL module driver.
+  *          This file provides firmware functions to manage the following 
+  *          functionalities of the Window Watchdog (WWDG) peripheral:
+  *           + Initialization and Configuration function
+  *           + IO operation 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 informs when a WWDG reset has 
+        occurred (check available with __HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST)).
+
+    (+) The WWDG downcounter input clock is derived from the APB clock divided
+        by a programmable prescaler.
+
+    (+) WWDG downcounter clock (Hz) = PCLK1 / (4096 * Prescaler)
+
+    (+) WWDG timeout (ms) = (1000 * (T[5;0] + 1)) / (WWDG downcounter clock)
+        where T[5;0] are the lowest 6 bits of downcounter.
+
+    (+) WWDG Counter refresh is allowed between the following limits :
+        (++) min time (ms) = (1000 * (T[5;0] - Window)) / (WWDG downcounter clock)
+        (++) max time (ms) = (1000 * (T[5;0] - 0x40)) / (WWDG downcounter clock)
+
+    (+) Min-max timeout value @80 MHz(PCLK1): ~51.2 us / ~26.22 ms
+
+    (+) The Early Wakeup Interrupt (EWI) can be used if specific safety 
+        operations or data logging must be performed before the actual reset is
+        generated. When the downcounter reaches the value 0x40, an 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.
+        In some applications, the EWI interrupt can be used to manage a software
+        system check and/or system recovery/graceful degradation, without 
+        generating a WWDG reset. In this case, the corresponding interrupt 
+        service routine (ISR) should reload the WWDG counter to avoid the WWDG 
+        reset, then trigger the required actions.
+        Note:When the EWI interrupt cannot be served, e.g. due to a system lock 
+        in a higher priority task, the WWDG reset will eventually be generated.
+
+    (+) Debug mode : When the microcontroller enters debug mode (core halted),
+        the WWDG counter either continues to work normally or stops, depending 
+        on DBG_WWDG_STOP configuration bit in DBG module, accessible through
+        __HAL_DBGMCU_FREEZE_WWDG() and __HAL_DBGMCU_UNFREEZE_WWDG() macros
+
+                     ##### How to use this driver #####
+  ==============================================================================
+  [..]
+    (+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE().
+
+    (+) Set the WWDG prescaler, refresh window, counter value and Early Wakeup 
+        Interrupt mode using using HAL_WWDG_Init() function.
+        This enables WWDG peripheral and the downcounter starts downcounting 
+        from given counter value.
+        Init function can be called again to modify all watchdog parameters, 
+        however if EWI mode has been set once, it can't be clear until next 
+        reset.
+
+    (+) 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 window value already programmed.
+
+    (+) if Early Wakeup Interrupt mode is enable an interrupt is generated when 
+        the counter reaches 0x40. User can add his own code in weak function 
+        HAL_WWDG_EarlyWakeupCallback().
+
+     *** WWDG HAL driver macros list ***
+     ==================================
+     [..]
+       Below the list of most used macros in WWDG HAL driver.
+
+      (+) __HAL_WWDG_GET_IT_SOURCE: Check the selected WWDG's interrupt source.
+      (+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status.
+      (+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags.
+
+  @endverbatim
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2016 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 "stm32f7xx_hal.h"
+
+/** @addtogroup STM32F7xx_HAL_Driver
+  * @{
+  */
+
+#ifdef HAL_WWDG_MODULE_ENABLED
+/** @defgroup WWDG WWDG
+  * @brief WWDG HAL module driver.
+  * @{
+  */
+
+/* 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 Configuration functions
+ *  @brief    Initialization and Configuration functions.
+ *
+@verbatim
+  ==============================================================================
+          ##### Initialization and Configuration functions #####
+  ==============================================================================
+  [..]  
+    This section provides functions allowing to:
+      (+) Initialize and start the WWDG according to the specified parameters
+          in the WWDG_InitTypeDef of associated handle.
+      (+) Initialize the WWDG MSP.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Initialize the WWDG according to the specified.
+  *         parameters in the WWDG_InitTypeDef of  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));
+  assert_param(IS_WWDG_EWI_MODE(hwwdg->Init.EWIMode));
+
+  /* Init the low level hardware */
+  HAL_WWDG_MspInit(hwwdg);
+
+  /* Set WWDG Counter */
+  WRITE_REG(hwwdg->Instance->CR, (WWDG_CR_WDGA | hwwdg->Init.Counter));
+
+  /* Set WWDG Prescaler and Window */
+  WRITE_REG(hwwdg->Instance->CFR, (hwwdg->Init.EWIMode | hwwdg->Init.Prescaler | hwwdg->Init.Window));
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+
+/**
+  * @brief  Initialize the WWDG MSP.
+  * @param  hwwdg  pointer to a WWDG_HandleTypeDef structure that contains
+  *                the configuration information for the specified WWDG module.
+  * @note   When rewriting this function in user file, mechanism may be added
+  *         to avoid multiple initialize when HAL_WWDG_Init function is called
+  *         again to change parameters.
+  * @retval None
+  */
+__weak void HAL_WWDG_MspInit(WWDG_HandleTypeDef *hwwdg)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hwwdg);
+
+  /* NOTE: This function should not be modified, when the callback is needed,
+           the HAL_WWDG_MspInit 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:
+    (+) Refresh the WWDG.
+    (+) Handle WWDG interrupt request and associated function callback.
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Refresh 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_Refresh(WWDG_HandleTypeDef *hwwdg)
+{
+  /* Write to WWDG CR the WWDG Counter value to refresh with */
+  WRITE_REG(hwwdg->Instance->CR, (hwwdg->Init.Counter));
+
+  /* Return function status */
+  return HAL_OK;
+}
+
+/**
+  * @brief  Handle 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 by calling HAL_WWDG_Init function with 
+  *         EWIMode set to WWDG_EWI_ENABLE.
+  *         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)
+  {
+    /* Check if WWDG Early Wakeup Interrupt occurred */
+    if(__HAL_WWDG_GET_FLAG(hwwdg, WWDG_FLAG_EWIF) != RESET)
+    {
+      /* Clear the WWDG Early Wakeup flag */
+      __HAL_WWDG_CLEAR_FLAG(hwwdg, WWDG_FLAG_EWIF);
+
+      /* Early Wakeup callback */ 
+      HAL_WWDG_EarlyWakeupCallback(hwwdg);
+    }
+  }
+}
+
+
+/**
+  * @brief  WWDG Early Wakeup 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_EarlyWakeupCallback(WWDG_HandleTypeDef* hwwdg)
+{
+  /* Prevent unused argument(s) compilation warning */
+  UNUSED(hwwdg);
+
+  /* NOTE: This function should not be modified, when the callback is needed,
+           the HAL_WWDG_EarlyWakeupCallback could be implemented in the user file
+   */
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+#endif /* HAL_WWDG_MODULE_ENABLED */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/