| /** |
| ****************************************************************************** |
| * @file stm32f7xx_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 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>© COPYRIGHT(c) 2017 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****/ |