2017-08-07 20:21:19 +00:00
|
|
|
// Copyright 2017 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
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @file esp_timer.h
|
|
|
|
* @brief microsecond-precision 64-bit timer API, replacement for ets_timer
|
|
|
|
*
|
|
|
|
* esp_timer APIs allow components to receive callbacks when a hardware timer
|
|
|
|
* reaches certain value. The timer provides microsecond accuracy and
|
|
|
|
* up to 64 bit range. Note that while the timer itself provides microsecond
|
|
|
|
* accuracy, callbacks are dispatched from an auxiliary task. Some time is
|
|
|
|
* needed to notify this task from timer ISR, and then to invoke the callback.
|
|
|
|
* If more than one callback needs to be dispatched at any particular time,
|
|
|
|
* each subsequent callback will be dispatched only when the previous callback
|
|
|
|
* returns. Therefore, callbacks should not do much work; instead, they should
|
|
|
|
* use RTOS notification mechanisms (queues, semaphores, event groups, etc.) to
|
|
|
|
* pass information to other tasks.
|
|
|
|
*
|
|
|
|
* <to be implemented> It should be possible to request the callback to be called
|
|
|
|
* directly from the ISR. This reduces the latency, but has potential impact on
|
|
|
|
* all other callbacks which need to be dispatched. This option should only be
|
|
|
|
* used for simple callback functions, which do not take longer than a few
|
|
|
|
* microseconds to run. </to be implemented>
|
|
|
|
*
|
|
|
|
* Implementation note: on the ESP32, esp_timer APIs use the "legacy" FRC2
|
|
|
|
* timer. Timer callbacks are called from a task running on the PRO CPU.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include "esp_err.h"
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
extern "C" {
|
|
|
|
#endif
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Opaque type representing a single esp_timer
|
|
|
|
*/
|
|
|
|
typedef struct esp_timer* esp_timer_handle_t;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Timer callback function type
|
|
|
|
* @param arg pointer to opaque user-specific data
|
|
|
|
*/
|
|
|
|
typedef void (*esp_timer_cb_t)(void* arg);
|
|
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Method for dispatching timer callback
|
|
|
|
*/
|
|
|
|
typedef enum {
|
|
|
|
ESP_TIMER_TASK, //!< Callback is called from timer task
|
|
|
|
|
|
|
|
/* Not supported for now, provision to allow callbacks to run directly
|
|
|
|
* from an ISR:
|
|
|
|
|
|
|
|
ESP_TIMER_ISR, //!< Callback is called from timer ISR
|
|
|
|
|
|
|
|
*/
|
|
|
|
} esp_timer_dispatch_t;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Timer configuration passed to esp_timer_create
|
|
|
|
*/
|
|
|
|
typedef struct {
|
|
|
|
esp_timer_cb_t callback; //!< Function to call when timer expires
|
|
|
|
void* arg; //!< Argument to pass to the callback
|
|
|
|
esp_timer_dispatch_t dispatch_method; //!< Call the callback from task or from ISR
|
|
|
|
const char* name; //!< Timer name, used in esp_timer_dump function
|
|
|
|
} esp_timer_create_args_t;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Initialize esp_timer library
|
|
|
|
*
|
|
|
|
* @note This function is called from startup code. Applications do not need
|
|
|
|
* to call this function before using other esp_timer APIs.
|
|
|
|
*
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_NO_MEM if allocation has failed
|
|
|
|
* - ESP_ERR_INVALID_STATE if already initialized
|
|
|
|
* - other errors from interrupt allocator
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_init();
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief De-initialize esp_timer library
|
|
|
|
*
|
|
|
|
* @note Normally this function should not be called from applications
|
|
|
|
*
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_INVALID_STATE if not yet initialized
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_deinit();
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Create an esp_timer instance
|
|
|
|
*
|
|
|
|
* @note When done using the timer, delete it with esp_timer_delete function.
|
|
|
|
*
|
|
|
|
* @param create_args Pointer to a structure with timer creation arguments.
|
|
|
|
* Not saved by the library, can be allocated on the stack.
|
|
|
|
* @param[out] out_handle Output, pointer to esp_timer_handle_t variable which
|
|
|
|
* will hold the created timer handle.
|
|
|
|
*
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_INVALID_ARG if some of the create_args are not valid
|
|
|
|
* - ESP_ERR_INVALID_STATE if esp_timer library is not initialized yet
|
|
|
|
* - ESP_ERR_NO_MEM if memory allocation fails
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_create(const esp_timer_create_args_t* create_args,
|
|
|
|
esp_timer_handle_t* out_handle);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Start one-shot timer
|
|
|
|
*
|
|
|
|
* Timer should not be running when this function is called.
|
|
|
|
*
|
|
|
|
* @param timer timer handle created using esp_timer_create
|
|
|
|
* @param timeout_us timer timeout, in microseconds relative to the current moment
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_INVALID_ARG if the handle is invalid
|
|
|
|
* - ESP_ERR_INVALID_STATE if the timer is already running
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_start_once(esp_timer_handle_t timer, uint64_t timeout_us);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Start a periodic timer
|
|
|
|
*
|
|
|
|
* Timer should not be running when this function is called. This function will
|
|
|
|
* start the timer which will trigger every 'period' microseconds.
|
|
|
|
*
|
|
|
|
* @param timer timer handle created using esp_timer_create
|
|
|
|
* @param period timer period, in microseconds
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_INVALID_ARG if the handle is invalid
|
|
|
|
* - ESP_ERR_INVALID_STATE if the timer is already running
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_start_periodic(esp_timer_handle_t timer, uint64_t period);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Stop the timer
|
|
|
|
*
|
|
|
|
* This function stops the timer previously started using esp_timer_start_once
|
|
|
|
* or esp_timer_start_periodic.
|
|
|
|
*
|
|
|
|
* @param timer timer handle created using esp_timer_create
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_INVALID_STATE if the timer is not running
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_stop(esp_timer_handle_t timer);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Delete an esp_timer instance
|
|
|
|
*
|
|
|
|
* The timer must be stopped before deleting. A one-shot timer which has expired
|
|
|
|
* does not need to be stopped.
|
|
|
|
*
|
|
|
|
* @param timer timer handle allocated using esp_timer_create
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_INVALID_STATE if the timer is not running
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_delete(esp_timer_handle_t timer);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Get time in microseconds since boot
|
|
|
|
* @return number of microseconds since esp_timer_init was called (this normally
|
|
|
|
* happens early during application startup).
|
|
|
|
*/
|
2017-08-30 03:15:29 +00:00
|
|
|
int64_t esp_timer_get_time();
|
2017-08-07 20:21:19 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* @brief Dump the list of timers to a stream
|
|
|
|
*
|
|
|
|
* If CONFIG_ESP_TIMER_PROFILING option is enabled, this prints the list of all
|
|
|
|
* the existing timers. Otherwise, only the list active timers is printed.
|
|
|
|
*
|
|
|
|
* The format is:
|
|
|
|
*
|
|
|
|
* name period alarm times_armed times_triggered total_callback_run_time
|
|
|
|
*
|
|
|
|
* where:
|
|
|
|
*
|
|
|
|
* name — timer name (if CONFIG_ESP_TIMER_PROFILING is defined), or timer pointer
|
|
|
|
* period — period of timer, in microseconds, or 0 for one-shot timer
|
|
|
|
* alarm - time of the next alarm, in microseconds since boot, or 0 if the timer
|
|
|
|
* is not started
|
|
|
|
*
|
|
|
|
* The following fields are printed if CONFIG_ESP_TIMER_PROFILING is defined:
|
|
|
|
*
|
|
|
|
* times_armed — number of times the timer was armed via esp_timer_start_X
|
|
|
|
* times_triggered - number of times the callback was called
|
|
|
|
* total_callback_run_time - total time taken by callback to execute, across all calls
|
|
|
|
*
|
|
|
|
* @param stream stream (such as stdout) to dump the information to
|
|
|
|
* @return
|
|
|
|
* - ESP_OK on success
|
|
|
|
* - ESP_ERR_NO_MEM if can not allocate temporary buffer for the output
|
|
|
|
*/
|
|
|
|
esp_err_t esp_timer_dump(FILE* stream);
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|