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320 lines
13 KiB
320 lines
13 KiB
/**
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******************************************************************************
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* @file stm32l0xx_hal_wwdg.c
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* @author MCD Application Team
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* @brief WWDG HAL module driver.
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* This file provides firmware functions to manage the following
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* functionalities of the Window Watchdog (WWDG) peripheral:
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* + Initialization and Configuration function
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* + IO operation functions
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@verbatim
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==============================================================================
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##### WWDG specific features #####
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==============================================================================
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[..]
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Once enabled the WWDG generates a system reset on expiry of a programmed
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time period, unless the program refreshes the counter (T[6;0] downcounter)
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before reaching 0x3F value (i.e. a reset is generated when the counter
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value rolls over from 0x40 to 0x3F).
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(+) An MCU reset is also generated if the counter value is refreshed
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before the counter has reached the refresh window value. This
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implies that the counter must be refreshed in a limited window.
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(+) Once enabled the WWDG cannot be disabled except by a system reset.
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(+) WWDGRST flag in RCC_CSR register informs when a WWDG reset has
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occurred (check available with __HAL_RCC_GET_FLAG(RCC_FLAG_WWDGRST)).
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(+) The WWDG downcounter input clock is derived from the APB clock divided
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by a programmable prescaler.
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(+) WWDG downcounter clock (Hz) = PCLK1 / (4096 * Prescaler)
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(+) WWDG timeout (ms) = (1000 * (T[5;0] + 1)) / (WWDG downcounter clock)
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where T[5;0] are the lowest 6 bits of downcounter.
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(+) WWDG Counter refresh is allowed between the following limits :
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(++) min time (ms) = (1000 * (T[5;0] - Window)) / (WWDG downcounter clock)
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(++) max time (ms) = (1000 * (T[5;0] - 0x40)) / (WWDG downcounter clock)
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(+) Min-max timeout value @32 MHz(PCLK1): ~128.0 us / ~65.54 ms
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(+) The Early Wakeup Interrupt (EWI) can be used if specific safety
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operations or data logging must be performed before the actual reset is
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generated. When the downcounter reaches the value 0x40, an EWI interrupt
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is generated and the corresponding interrupt service routine (ISR) can
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be used to trigger specific actions (such as communications or data
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logging), before resetting the device.
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In some applications, the EWI interrupt can be used to manage a software
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system check and/or system recovery/graceful degradation, without
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generating a WWDG reset. In this case, the corresponding interrupt
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service routine (ISR) should reload the WWDG counter to avoid the WWDG
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reset, then trigger the required actions.
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Note:When the EWI interrupt cannot be served, e.g. due to a system lock
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in a higher priority task, the WWDG reset will eventually be generated.
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(+) Debug mode : When the microcontroller enters debug mode (core halted),
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the WWDG counter either continues to work normally or stops, depending
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on DBG_WWDG_STOP configuration bit in DBG module, accessible through
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__HAL_DBGMCU_FREEZE_WWDG() and __HAL_DBGMCU_UNFREEZE_WWDG() macros
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##### How to use this driver #####
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==============================================================================
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[..]
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(+) Enable WWDG APB1 clock using __HAL_RCC_WWDG_CLK_ENABLE().
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(+) Set the WWDG prescaler, refresh window, counter value and Early Wakeup
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Interrupt mode using using HAL_WWDG_Init() function.
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This enables WWDG peripheral and the downcounter starts downcounting
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from given counter value.
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Init function can be called again to modify all watchdog parameters,
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however if EWI mode has been set once, it can't be clear until next
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reset.
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(+) The application program must refresh the WWDG counter at regular
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intervals during normal operation to prevent an MCU reset using
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HAL_WWDG_Refresh() function. This operation must occur only when
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the counter is lower than the window value already programmed.
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(+) if Early Wakeup Interrupt mode is enable an interrupt is generated when
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the counter reaches 0x40. User can add his own code in weak function
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HAL_WWDG_EarlyWakeupCallback().
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*** WWDG HAL driver macros list ***
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==================================
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[..]
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Below the list of most used macros in WWDG HAL driver.
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(+) __HAL_WWDG_GET_IT_SOURCE: Check the selected WWDG's interrupt source.
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(+) __HAL_WWDG_GET_FLAG: Get the selected WWDG's flag status.
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(+) __HAL_WWDG_CLEAR_FLAG: Clear the WWDG's pending flags.
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@endverbatim
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******************************************************************************
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* @attention
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*
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* <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of STMicroelectronics nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "stm32l0xx_hal.h"
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/** @addtogroup STM32L0xx_HAL_Driver
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* @{
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*/
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#ifdef HAL_WWDG_MODULE_ENABLED
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/** @defgroup WWDG WWDG
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* @brief WWDG HAL module driver.
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Private function prototypes -----------------------------------------------*/
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/* Exported functions --------------------------------------------------------*/
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/** @defgroup WWDG_Exported_Functions WWDG Exported Functions
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* @{
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*/
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/** @defgroup WWDG_Exported_Functions_Group1 Initialization and Configuration functions
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* @brief Initialization and Configuration functions.
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*
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@verbatim
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==============================================================================
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##### Initialization and Configuration functions #####
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==============================================================================
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[..]
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This section provides functions allowing to:
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(+) Initialize and start the WWDG according to the specified parameters
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in the WWDG_InitTypeDef of associated handle.
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(+) Initialize the WWDG MSP.
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@endverbatim
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* @{
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*/
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/**
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* @brief Initialize the WWDG according to the specified.
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* parameters in the WWDG_InitTypeDef of associated handle.
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* @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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* the configuration information for the specified WWDG module.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_WWDG_Init(WWDG_HandleTypeDef *hwwdg)
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{
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/* Check the WWDG handle allocation */
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if(hwwdg == NULL)
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{
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return HAL_ERROR;
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}
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/* Check the parameters */
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assert_param(IS_WWDG_ALL_INSTANCE(hwwdg->Instance));
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assert_param(IS_WWDG_PRESCALER(hwwdg->Init.Prescaler));
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assert_param(IS_WWDG_WINDOW(hwwdg->Init.Window));
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assert_param(IS_WWDG_COUNTER(hwwdg->Init.Counter));
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assert_param(IS_WWDG_EWI_MODE(hwwdg->Init.EWIMode));
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/* Init the low level hardware */
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HAL_WWDG_MspInit(hwwdg);
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/* Set WWDG Counter */
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WRITE_REG(hwwdg->Instance->CR, (WWDG_CR_WDGA | hwwdg->Init.Counter));
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/* Set WWDG Prescaler and Window */
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WRITE_REG(hwwdg->Instance->CFR, (hwwdg->Init.EWIMode | hwwdg->Init.Prescaler | hwwdg->Init.Window));
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/* Return function status */
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return HAL_OK;
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}
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/**
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* @brief Initialize the WWDG MSP.
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* @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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* the configuration information for the specified WWDG module.
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* @note When rewriting this function in user file, mechanism may be added
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* to avoid multiple initialize when HAL_WWDG_Init function is called
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* again to change parameters.
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* @retval None
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*/
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__weak void HAL_WWDG_MspInit(WWDG_HandleTypeDef *hwwdg)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hwwdg);
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/* NOTE: This function should not be modified, when the callback is needed,
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the HAL_WWDG_MspInit could be implemented in the user file
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*/
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}
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/**
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* @}
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*/
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/** @defgroup WWDG_Exported_Functions_Group2 IO operation functions
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* @brief IO operation functions
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*
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@verbatim
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==============================================================================
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##### IO operation functions #####
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==============================================================================
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[..]
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This section provides functions allowing to:
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(+) Refresh the WWDG.
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(+) Handle WWDG interrupt request and associated function callback.
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@endverbatim
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* @{
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*/
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/**
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* @brief Refresh the WWDG.
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* @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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* the configuration information for the specified WWDG module.
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* @retval HAL status
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*/
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HAL_StatusTypeDef HAL_WWDG_Refresh(WWDG_HandleTypeDef *hwwdg)
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{
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/* Write to WWDG CR the WWDG Counter value to refresh with */
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WRITE_REG(hwwdg->Instance->CR, (hwwdg->Init.Counter));
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/* Return function status */
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return HAL_OK;
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}
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/**
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* @brief Handle WWDG interrupt request.
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* @note The Early Wakeup Interrupt (EWI) can be used if specific safety operations
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* or data logging must be performed before the actual reset is generated.
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* The EWI interrupt is enabled by calling HAL_WWDG_Init function with
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* EWIMode set to WWDG_EWI_ENABLE.
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* When the downcounter reaches the value 0x40, and EWI interrupt is
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* generated and the corresponding Interrupt Service Routine (ISR) can
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* be used to trigger specific actions (such as communications or data
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* logging), before resetting the device.
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* @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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* the configuration information for the specified WWDG module.
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* @retval None
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*/
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void HAL_WWDG_IRQHandler(WWDG_HandleTypeDef *hwwdg)
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{
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/* Check if Early Wakeup Interrupt is enable */
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if(__HAL_WWDG_GET_IT_SOURCE(hwwdg, WWDG_IT_EWI) != RESET)
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{
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/* Check if WWDG Early Wakeup Interrupt occurred */
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if(__HAL_WWDG_GET_FLAG(hwwdg, WWDG_FLAG_EWIF) != RESET)
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{
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/* Clear the WWDG Early Wakeup flag */
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__HAL_WWDG_CLEAR_FLAG(hwwdg, WWDG_FLAG_EWIF);
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/* Early Wakeup callback */
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HAL_WWDG_EarlyWakeupCallback(hwwdg);
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}
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}
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}
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/**
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* @brief WWDG Early Wakeup callback.
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* @param hwwdg pointer to a WWDG_HandleTypeDef structure that contains
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* the configuration information for the specified WWDG module.
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* @retval None
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*/
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__weak void HAL_WWDG_EarlyWakeupCallback(WWDG_HandleTypeDef* hwwdg)
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{
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/* Prevent unused argument(s) compilation warning */
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UNUSED(hwwdg);
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/* NOTE: This function should not be modified, when the callback is needed,
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the HAL_WWDG_EarlyWakeupCallback could be implemented in the user file
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*/
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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#endif /* HAL_WWDG_MODULE_ENABLED */
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/**
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* @}
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*/
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/**
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* @}
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*/
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/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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