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tools/sdk/include/esp_common/esp_task_wdt.h Normal file
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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_err.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Initialize the Task Watchdog Timer (TWDT)
*
* This function configures and initializes the TWDT. If the TWDT is already
* initialized when this function is called, this function will update the
* TWDT's timeout period and panic configurations instead. After initializing
* the TWDT, any task can elect to be watched by the TWDT by subscribing to it
* using esp_task_wdt_add().
*
* @param[in] timeout Timeout period of TWDT in seconds
* @param[in] panic Flag that controls whether the panic handler will be
* executed when the TWDT times out
*
* @return
* - ESP_OK: Initialization was successful
* - ESP_ERR_NO_MEM: Initialization failed due to lack of memory
*
* @note esp_task_wdt_init() must only be called after the scheduler
* started
*/
esp_err_t esp_task_wdt_init(uint32_t timeout, bool panic);
/**
* @brief Deinitialize the Task Watchdog Timer (TWDT)
*
* This function will deinitialize the TWDT. Calling this function whilst tasks
* are still subscribed to the TWDT, or when the TWDT is already deinitialized,
* will result in an error code being returned.
*
* @return
* - ESP_OK: TWDT successfully deinitialized
* - ESP_ERR_INVALID_STATE: Error, tasks are still subscribed to the TWDT
* - ESP_ERR_NOT_FOUND: Error, TWDT has already been deinitialized
*/
esp_err_t esp_task_wdt_deinit();
/**
* @brief Subscribe a task to the Task Watchdog Timer (TWDT)
*
* This function subscribes a task to the TWDT. Each subscribed task must
* periodically call esp_task_wdt_reset() to prevent the TWDT from elapsing its
* timeout period. Failure to do so will result in a TWDT timeout. If the task
* being subscribed is one of the Idle Tasks, this function will automatically
* enable esp_task_wdt_reset() to called from the Idle Hook of the Idle Task.
* Calling this function whilst the TWDT is uninitialized or attempting to
* subscribe an already subscribed task will result in an error code being
* returned.
*
* @param[in] handle Handle of the task. Input NULL to subscribe the current
* running task to the TWDT
*
* @return
* - ESP_OK: Successfully subscribed the task to the TWDT
* - ESP_ERR_INVALID_ARG: Error, the task is already subscribed
* - ESP_ERR_NO_MEM: Error, could not subscribe the task due to lack of
* memory
* - ESP_ERR_INVALID_STATE: Error, the TWDT has not been initialized yet
*/
esp_err_t esp_task_wdt_add(TaskHandle_t handle);
/**
* @brief Reset the Task Watchdog Timer (TWDT) on behalf of the currently
* running task
*
* This function will reset the TWDT on behalf of the currently running task.
* Each subscribed task must periodically call this function to prevent the
* TWDT from timing out. If one or more subscribed tasks fail to reset the
* TWDT on their own behalf, a TWDT timeout will occur. If the IDLE tasks have
* been subscribed to the TWDT, they will automatically call this function from
* their idle hooks. Calling this function from a task that has not subscribed
* to the TWDT, or when the TWDT is uninitialized will result in an error code
* being returned.
*
* @return
* - ESP_OK: Successfully reset the TWDT on behalf of the currently
* running task
* - ESP_ERR_NOT_FOUND: Error, the current running task has not subscribed
* to the TWDT
* - ESP_ERR_INVALID_STATE: Error, the TWDT has not been initialized yet
*/
esp_err_t esp_task_wdt_reset();
/**
* @brief Unsubscribes a task from the Task Watchdog Timer (TWDT)
*
* This function will unsubscribe a task from the TWDT. After being
* unsubscribed, the task should no longer call esp_task_wdt_reset(). If the
* task is an IDLE task, this function will automatically disable the calling
* of esp_task_wdt_reset() from the Idle Hook. Calling this function whilst the
* TWDT is uninitialized or attempting to unsubscribe an already unsubscribed
* task from the TWDT will result in an error code being returned.
*
* @param[in] handle Handle of the task. Input NULL to unsubscribe the
* current running task.
*
* @return
* - ESP_OK: Successfully unsubscribed the task from the TWDT
* - ESP_ERR_INVALID_ARG: Error, the task is already unsubscribed
* - ESP_ERR_INVALID_STATE: Error, the TWDT has not been initialized yet
*/
esp_err_t esp_task_wdt_delete(TaskHandle_t handle);
/**
* @brief Query whether a task is subscribed to the Task Watchdog Timer (TWDT)
*
* This function will query whether a task is currently subscribed to the TWDT,
* or whether the TWDT is initialized.
*
* @param[in] handle Handle of the task. Input NULL to query the current
* running task.
*
* @return:
* - ESP_OK: The task is currently subscribed to the TWDT
* - ESP_ERR_NOT_FOUND: The task is currently not subscribed to the TWDT
* - ESP_ERR_INVALID_STATE: The TWDT is not initialized, therefore no tasks
* can be subscribed
*/
esp_err_t esp_task_wdt_status(TaskHandle_t handle);
#ifdef __cplusplus
}
#endif