WebSVN – DashDisplay – Diff – /branches/Dashboard_L152_v2/Drivers/STM32L1xx_HAL_Driver/Src/stm32l1xx_hal_wwdg.c

 /**
   ******************************************************************************
   * @file    stm32l1xx_hal_wwdg.c
   * @author  MCD Application Team
   * @brief   WWDG HAL module driver.
   *          This file provides firmware functions to manage the following
   *          functionalities of the Window Watchdog (WWDG) peripheral:
   *           + Initialization and Configuration functions
   *           + IO operation functions
-  @verbatim
+  ******************************************************************************
-  ==============================================================================
+  * @attention
-                      ##### WWDG Specific features #####
+  *
-  ==============================================================================
+  * Copyright (c) 2016 STMicroelectronics.
-  [..]
+  * All rights reserved.
-    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)
+  * This software is licensed under terms that can be found in the LICENSE file
-    before reaching 0x3F value (i.e. a reset is generated when the counter
+  * in the root directory of this software component.
-    value rolls down from 0x40 to 0x3F).
+  * If no LICENSE file comes with this software, it is provided AS-IS.
+  *
-    (+) An MCU reset is also generated if the counter value is refreshed
+  ******************************************************************************
-        before the counter has reached the refresh window value. This
+  @verbatim
-        implies that the counter must be refreshed in a limited window.
+  ==============================================================================
-    (+) Once enabled the WWDG cannot be disabled except by a system reset.
+                      ##### WWDG Specific features #####
-    (+) If required by application, an Early Wakeup Interrupt can be triggered
+  ==============================================================================
-        in order to be warned before WWDG expiration. The Early Wakeup Interrupt
+  [..]
-        (EWI) can be used if specific safety operations or data logging must
+    Once enabled the WWDG generates a system reset on expiry of a programmed
-        be performed before the actual reset is generated. When the downcounter
+    time period, unless the program refreshes the counter (T[6;0] downcounter)
-        reaches 0x40, interrupt occurs. This mechanism requires WWDG interrupt
+    before reaching 0x3F value (i.e. a reset is generated when the counter
-        line to be enabled in NVIC. Once enabled, EWI interrupt cannot be
+    value rolls down from 0x40 to 0x3F).
-        disabled except by a system reset.
-    (+) WWDGRST flag in RCC CSR register can be used to inform when a WWDG
+    (+) An MCU reset is also generated if the counter value is refreshed
-        reset occurs.
+        before the counter has reached the refresh window value. This
-    (+) The WWDG counter input clock is derived from the APB clock divided
+        implies that the counter must be refreshed in a limited window.
-        by a programmable prescaler.
+    (+) Once enabled the WWDG cannot be disabled except by a system reset.
-    (+) WWDG clock (Hz) = PCLK1 / (4096 * Prescaler)
+    (+) If required by application, an Early Wakeup Interrupt can be triggered
-    (+) WWDG timeout (mS) = 1000 * (T[5;0] + 1) / WWDG clock (Hz)
+        in order to be warned before WWDG expiration. The Early Wakeup Interrupt
-        where T[5;0] are the lowest 6 bits of Counter.
+        (EWI) can be used if specific safety operations or data logging must
-    (+) WWDG Counter refresh is allowed between the following limits :
+        be performed before the actual reset is generated. When the downcounter
-        (++) min time (mS) = 1000 * (Counter - Window) / WWDG clock
+        reaches 0x40, interrupt occurs. This mechanism requires WWDG interrupt
-        (++) max time (mS) = 1000 * (Counter - 0x40) / WWDG clock
+        line to be enabled in NVIC. Once enabled, EWI interrupt cannot be
-    (+) Typical values:
+        disabled except by a system reset.
-        (++) Counter min (T[5;0] = 0x00) at 32MHz (PCLK1) with zero prescaler:
+    (+) WWDGRST flag in RCC CSR register can be used to inform when a WWDG
-             max timeout before reset: approximately 41.79µs
+        reset occurs.
-        (++) Counter max (T[5;0] = 0x3F) at 32MHz (PCLK1) with prescaler
+    (+) The WWDG counter input clock is derived from the APB clock divided
-             dividing by 8:
+        by a programmable prescaler.
-             max timeout before reset: approximately 342.38ms
+    (+) WWDG clock (Hz) = PCLK1 / (4096 * Prescaler)
+    (+) WWDG timeout (mS) = 1000 * (T[5;0] + 1) / WWDG clock (Hz)
-                     ##### How to use this driver #####
+        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
-    *** Common driver usage ***
+        (++) max time (mS) = 1000 * (Counter - 0x40) / WWDG clock
-    ===========================
+    (+) Typical values:
+        (++) Counter min (T[5;0] = 0x00) at 32MHz (PCLK1) with zero prescaler:
-  [..]
+             max timeout before reset: approximately 41.79us
-    (+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE().
+        (++) Counter max (T[5;0] = 0x3F) at 32MHz (PCLK1) with prescaler
-    (+) Configure the WWDG prescaler, refresh window value, counter value and early
+             dividing by 8:
-        interrupt status using HAL_WWDG_Init() function. This will automatically
+             max timeout before reset: approximately 342.38ms
-        enable WWDG and start its downcounter. Time reference can be taken from
-        function exit. Care must be taken to provide a counter value
+                     ##### How to use this driver #####
-        greater than 0x40 to prevent generation of immediate reset.
+  ==============================================================================
-    (+) If the Early Wakeup Interrupt (EWI) feature is enabled, an interrupt is
-        generated when the counter reaches 0x40. When HAL_WWDG_IRQHandler is
+    *** Common driver usage ***
-        triggered by the interrupt service routine, flag will be automatically
+    ===========================
-        cleared and HAL_WWDG_WakeupCallback user callback will be executed. User
-        can add his own code by customization of callback HAL_WWDG_WakeupCallback.
+  [..]
-    (+) Then the application program must refresh the WWDG counter at regular
+    (+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE().
-        intervals during normal operation to prevent an MCU reset, using
+    (+) Configure the WWDG prescaler, refresh window value, counter value and early
-        HAL_WWDG_Refresh() function. This operation must occur only when
+        interrupt status using HAL_WWDG_Init() function. This will automatically
-        the counter is lower than the refresh window value already programmed.
+        enable WWDG and start its downcounter. Time reference can be taken from
+        function exit. Care must be taken to provide a counter value
-    *** Callback registration ***
+        greater than 0x40 to prevent generation of immediate reset.
-    =============================
+    (+) If the Early Wakeup Interrupt (EWI) feature is enabled, an interrupt is
+        generated when the counter reaches 0x40. When HAL_WWDG_IRQHandler is
-  [..]
+        triggered by the interrupt service routine, flag will be automatically
-    The compilation define USE_HAL_WWDG_REGISTER_CALLBACKS when set to 1 allows
+        cleared and HAL_WWDG_WakeupCallback user callback will be executed. User
-    the user to configure dynamically the driver callbacks. Use Functions
+        can add his own code by customization of callback HAL_WWDG_WakeupCallback.
-    HAL_WWDG_RegisterCallback() to register a user callback.
+    (+) Then the application program must refresh the WWDG counter at regular
+        intervals during normal operation to prevent an MCU reset, using
-    (+) Function HAL_WWDG_RegisterCallback() allows to register following
+        HAL_WWDG_Refresh() function. This operation must occur only when
-        callbacks:
+        the counter is lower than the refresh window value already programmed.
-        (++) EwiCallback : callback for Early WakeUp Interrupt.
-        (++) MspInitCallback : WWDG MspInit.
+    *** Callback registration ***
-    This function takes as parameters the HAL peripheral handle, the Callback ID
+    =============================
-    and a pointer to the user callback function.
+  [..]
-    (+) Use function HAL_WWDG_UnRegisterCallback() to reset a callback to
+    The compilation define USE_HAL_WWDG_REGISTER_CALLBACKS when set to 1 allows
-    the default weak (surcharged) function. HAL_WWDG_UnRegisterCallback()
+    the user to configure dynamically the driver callbacks. Use Functions
-    takes as parameters the HAL peripheral handle and the Callback ID.
+    HAL_WWDG_RegisterCallback() to register a user callback.
-    This function allows to reset following callbacks:
-        (++) EwiCallback : callback for  Early WakeUp Interrupt.
+    (+) Function HAL_WWDG_RegisterCallback() allows to register following
-        (++) MspInitCallback : WWDG MspInit.
+        callbacks:
+        (++) EwiCallback : callback for Early WakeUp Interrupt.
-    [..]
+        (++) MspInitCallback : WWDG MspInit.
-    When calling HAL_WWDG_Init function, callbacks are reset to the
+    This function takes as parameters the HAL peripheral handle, the Callback ID
-    corresponding legacy weak (surcharged) functions:
+    and a pointer to the user callback function.
-    HAL_WWDG_EarlyWakeupCallback() and HAL_WWDG_MspInit() only if they have
-    not been registered before.
+    (+) Use function HAL_WWDG_UnRegisterCallback() to reset a callback to
+    the default weak (surcharged) function. HAL_WWDG_UnRegisterCallback()
-    [..]
+    takes as parameters the HAL peripheral handle and the Callback ID.
-    When compilation define USE_HAL_WWDG_REGISTER_CALLBACKS is set to 0 or
+    This function allows to reset following callbacks:
-    not defined, the callback registering feature is not available
+        (++) EwiCallback : callback for  Early WakeUp Interrupt.
-    and weak (surcharged) callbacks are used.
+        (++) MspInitCallback : WWDG MspInit.
-    *** WWDG HAL driver macros list ***
+    [..]
-    ===================================
+    When calling HAL_WWDG_Init function, callbacks are reset to the
-    [..]
+    corresponding legacy weak (surcharged) functions:
-      Below the list of available macros in WWDG HAL driver.
+    HAL_WWDG_EarlyWakeupCallback() and HAL_WWDG_MspInit() only if they have
-      (+) __HAL_WWDG_ENABLE: Enable the WWDG peripheral
+    not been registered before.
-      (+) __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: Enable the WWDG early wakeup interrupt
+    When compilation define USE_HAL_WWDG_REGISTER_CALLBACKS is set to 0 or
+    not defined, the callback registering feature is not available
-  @endverbatim
+    and weak (surcharged) callbacks are used.
-  ******************************************************************************
-  * @attention
+    *** WWDG HAL driver macros list ***
-  *
+    ===================================
-  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+    [..]
-  * All rights reserved.</center></h2>
+      Below the list of available macros in WWDG HAL driver.
-  *
+      (+) __HAL_WWDG_ENABLE: Enable the WWDG peripheral
-  * This software component is licensed by ST under BSD 3-Clause license,
+      (+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status
-  * the "License"; You may not use this file except in compliance with the
+      (+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags
-  * License. You may obtain a copy of the License at:
+      (+) __HAL_WWDG_ENABLE_IT: Enable the WWDG early wakeup interrupt
-  *                        opensource.org/licenses/BSD-3-Clause
-  *
+  @endverbatim
   ******************************************************************************
   */
 /* Includes ------------------------------------------------------------------*/
 #include "stm32l1xx_hal.h"
 /** @addtogroup STM32L1xx_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));
 #if (USE_HAL_WWDG_REGISTER_CALLBACKS == 1)
   /* Reset Callback pointers */
   if (hwwdg->EwiCallback == NULL)
   {
     hwwdg->EwiCallback = HAL_WWDG_EarlyWakeupCallback;
   }
   if (hwwdg->MspInitCallback == NULL)
   {
     hwwdg->MspInitCallback = HAL_WWDG_MspInit;
   }
   /* Init the low level hardware */
   hwwdg->MspInitCallback(hwwdg);
 #else
   /* Init the low level hardware */
   HAL_WWDG_MspInit(hwwdg);
 #endif /* USE_HAL_WWDG_REGISTER_CALLBACKS */
   /* 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
    */
 }
 #if (USE_HAL_WWDG_REGISTER_CALLBACKS == 1)
 /**
   * @brief  Register a User WWDG Callback
   *         To be used instead of the weak (surcharged) predefined callback
   * @param  hwwdg WWDG handle
   * @param  CallbackID ID of the callback to be registered
   *         This parameter can be one of the following values:
   *           @arg @ref HAL_WWDG_EWI_CB_ID Early WakeUp Interrupt Callback ID
   *           @arg @ref HAL_WWDG_MSPINIT_CB_ID MspInit callback ID
   * @param  pCallback pointer to the Callback function
   * @retval status
   */
 HAL_StatusTypeDef HAL_WWDG_RegisterCallback(WWDG_HandleTypeDef *hwwdg, HAL_WWDG_CallbackIDTypeDef CallbackID,
                                             pWWDG_CallbackTypeDef pCallback)
 {
   HAL_StatusTypeDef status = HAL_OK;
   if (pCallback == NULL)
   {
     status = HAL_ERROR;
   }
   else
   {
     switch (CallbackID)
     {
       case HAL_WWDG_EWI_CB_ID:
         hwwdg->EwiCallback = pCallback;
         break;
       case HAL_WWDG_MSPINIT_CB_ID:
         hwwdg->MspInitCallback = pCallback;
         break;
       default:
         status = HAL_ERROR;
         break;
     }
   }
   return status;
 }
 /**
   * @brief  Unregister a WWDG Callback
   *         WWDG Callback is redirected to the weak (surcharged) predefined callback
   * @param  hwwdg WWDG handle
   * @param  CallbackID ID of the callback to be registered
   *         This parameter can be one of the following values:
   *           @arg @ref HAL_WWDG_EWI_CB_ID Early WakeUp Interrupt Callback ID
   *           @arg @ref HAL_WWDG_MSPINIT_CB_ID MspInit callback ID
   * @retval status
   */
 HAL_StatusTypeDef HAL_WWDG_UnRegisterCallback(WWDG_HandleTypeDef *hwwdg, HAL_WWDG_CallbackIDTypeDef CallbackID)
 {
   HAL_StatusTypeDef status = HAL_OK;
   switch (CallbackID)
   {
     case HAL_WWDG_EWI_CB_ID:
       hwwdg->EwiCallback = HAL_WWDG_EarlyWakeupCallback;
       break;
     case HAL_WWDG_MSPINIT_CB_ID:
       hwwdg->MspInitCallback = HAL_WWDG_MspInit;
       break;
     default:
       status = HAL_ERROR;
       break;
   }
   return status;
 }
 #endif /* USE_HAL_WWDG_REGISTER_CALLBACKS */
 /**
   * @}
   */
 /** @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);
 #if (USE_HAL_WWDG_REGISTER_CALLBACKS == 1)
       /* Early Wakeup registered callback */
       hwwdg->EwiCallback(hwwdg);
 #else
       /* Early Wakeup callback */
       HAL_WWDG_EarlyWakeupCallback(hwwdg);
 #endif /* USE_HAL_WWDG_REGISTER_CALLBACKS */
     }
   }
 }
 /**
   * @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****/

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