| /** | |
| ****************************************************************************** | |
| * @file stm32f7xx_hal_wwdg.c | |
| * @author MCD Application Team | |
| * @version V1.0.0 | |
| * @date 12-May-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 (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) = 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>© 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) | |
| { | |
| /* 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 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) | |
| { | |
| /* 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****/ |