326 lines
13 KiB
C
326 lines
13 KiB
C
// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ESP_EVENT_H_
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#define ESP_EVENT_H_
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#include "esp_err.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/queue.h"
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#include "freertos/semphr.h"
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#include "esp_event_base.h"
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#include "esp_event_legacy.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/// Configuration for creating event loops
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typedef struct {
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int32_t queue_size; /**< size of the event loop queue */
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const char* task_name; /**< name of the event loop task; if NULL,
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a dedicated task is not created for event loop*/
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UBaseType_t task_priority; /**< priority of the event loop task, ignored if task name is NULL */
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uint32_t task_stack_size; /**< stack size of the event loop task, ignored if task name is NULL */
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BaseType_t task_core_id; /**< core to which the event loop task is pinned to,
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ignored if task name is NULL */
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} esp_event_loop_args_t;
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/**
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* @brief Create a new event loop.
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*
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* @param[in] event_loop_args configuration structure for the event loop to create
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* @param[out] event_loop handle to the created event loop
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_NO_MEM: Cannot allocate memory for event loops list
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* - ESP_FAIL: Failed to create task loop
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* - Others: Fail
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*/
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esp_err_t esp_event_loop_create(const esp_event_loop_args_t* event_loop_args, esp_event_loop_handle_t* event_loop);
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/**
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* @brief Delete an existing event loop.
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*
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* @param[in] event_loop event loop to delete
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*
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* @return
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* - ESP_OK: Success
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* - Others: Fail
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*/
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esp_err_t esp_event_loop_delete(esp_event_loop_handle_t event_loop);
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/**
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* @brief Create default event loop
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_NO_MEM: Cannot allocate memory for event loops list
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* - ESP_FAIL: Failed to create task loop
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* - Others: Fail
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*/
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esp_err_t esp_event_loop_create_default();
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/**
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* @brief Delete the default event loop
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*
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* @return
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* - ESP_OK: Success
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* - Others: Fail
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*/
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esp_err_t esp_event_loop_delete_default();
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/**
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* @brief Dispatch events posted to an event loop.
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*
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* This function is used to dispatch events posted to a loop with no dedicated task, i.e task name was set to NULL
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* in event_loop_args argument during loop creation. This function includes an argument to limit the amount of time
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* it runs, returning control to the caller when that time expires (or some time afterwards). There is no guarantee
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* that a call to this function will exit at exactly the time of expiry. There is also no guarantee that events have
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* been dispatched during the call, as the function might have spent all of the alloted time waiting on the event queue.
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* Once an event has been unqueued, however, it is guaranteed to be dispatched. This guarantee contributes to not being
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* able to exit exactly at time of expiry as (1) blocking on internal mutexes is necessary for dispatching the unqueued
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* event, and (2) during dispatch of the unqueued event there is no way to control the time occupied by handler code
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* execution. The guaranteed time of exit is therefore the alloted time + amount of time required to dispatch
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* the last unqueued event.
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*
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* In cases where waiting on the queue times out, ESP_OK is returned and not ESP_ERR_TIMEOUT, since it is
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* normal behavior.
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*
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* @param[in] event_loop event loop to dispatch posted events from
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* @param[in] ticks_to_run number of ticks to run the loop
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*
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* @note encountering an unknown event that has been posted to the loop will only generate a warning, not an error.
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*
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* @return
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* - ESP_OK: Success
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* - Others: Fail
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*/
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esp_err_t esp_event_loop_run(esp_event_loop_handle_t event_loop, TickType_t ticks_to_run);
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/**
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* @brief Register an event handler to the system event loop.
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*
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* This function can be used to register a handler for either: (1) specific events,
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* (2) all events of a certain event base, or (3) all events known by the system event loop.
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*
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* - specific events: specify exact event_base and event_id
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* - all events of a certain base: specify exact event_base and use ESP_EVENT_ANY_ID as the event_id
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* - all events known by the loop: use ESP_EVENT_ANY_BASE for event_base and ESP_EVENT_ANY_ID as the event_id
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*
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* Registering multiple handlers to events is possible. Registering a single handler to multiple events is
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* also possible. However, registering the same handler to the same event multiple times would cause the
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* previous registrations to be overwritten.
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*
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* @param[in] event_base the base id of the event to register the handler for
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* @param[in] event_id the id of the event to register the handler for
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* @param[in] event_handler the handler function which gets called when the event is dispatched
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* @param[in] event_handler_arg data, aside from event data, that is passed to the handler when it is called
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*
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* @note the event loop library does not maintain a copy of event_handler_arg, therefore the user should
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* ensure that event_handler_arg still points to a valid location by the time the handler gets called
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_NO_MEM: Cannot allocate memory for the handler
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* - ESP_ERR_INVALID_ARG: Invalid combination of event base and event id
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* - Others: Fail
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*/
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esp_err_t esp_event_handler_register(esp_event_base_t event_base,
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int32_t event_id,
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esp_event_handler_t event_handler,
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void* event_handler_arg);
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/**
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* @brief Register an event handler to a specific loop.
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*
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* This function behaves in the same manner as esp_event_handler_register, except the additional
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* specification of the event loop to register the handler to.
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*
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* @param[in] event_loop the event loop to register this handler function to
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* @param[in] event_base the base id of the event to register the handler for
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* @param[in] event_id the id of the event to register the handler for
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* @param[in] event_handler the handler function which gets called when the event is dispatched
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* @param[in] event_handler_arg data, aside from event data, that is passed to the handler when it is called
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*
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* @note the event loop library does not maintain a copy of event_handler_arg, therefore the user should
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* ensure that event_handler_arg still points to a valid location by the time the handler gets called
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_NO_MEM: Cannot allocate memory for the handler
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* - ESP_ERR_INVALID_ARG: Invalid combination of event base and event id
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* - Others: Fail
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*/
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esp_err_t esp_event_handler_register_with(esp_event_loop_handle_t event_loop,
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esp_event_base_t event_base,
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int32_t event_id,
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esp_event_handler_t event_handler,
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void* event_handler_arg);
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/**
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* @brief Unregister a handler with the system event loop.
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*
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* This function can be used to unregister a handler so that it no longer gets called during dispatch.
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* Handlers can be unregistered for either: (1) specific events, (2) all events of a certain event base,
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* or (3) all events known by the system event loop
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*
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* - specific events: specify exact event_base and event_id
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* - all events of a certain base: specify exact event_base and use ESP_EVENT_ANY_ID as the event_id
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* - all events known by the loop: use ESP_EVENT_ANY_BASE for event_base and ESP_EVENT_ANY_ID as the event_id
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*
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* This function ignores unregistration of handlers that has not been previously registered.
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*
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* @param[in] event_base the base of the event with which to unregister the handler
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* @param[in] event_id the id of the event with which to unregister the handler
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* @param[in] event_handler the handler to unregister
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*
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* @return ESP_OK success
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* @return ESP_ERR_INVALID_ARG invalid combination of event base and event id
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* @return others fail
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*/
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esp_err_t esp_event_handler_unregister(esp_event_base_t event_base, int32_t event_id, esp_event_handler_t event_handler);
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/**
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* @brief Unregister a handler with the system event loop.
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*
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* This function behaves in the same manner as esp_event_handler_unregister, except the additional specification of
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* the event loop to unregister the handler with.
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*
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* @param[in] event_loop the event loop with which to unregister this handler function
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* @param[in] event_base the base of the event with which to unregister the handler
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* @param[in] event_id the id of the event with which to unregister the handler
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* @param[in] event_handler the handler to unregister
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_INVALID_ARG: Invalid combination of event base and event id
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* - Others: Fail
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*/
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esp_err_t esp_event_handler_unregister_with(esp_event_loop_handle_t event_loop,
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esp_event_base_t event_base,
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int32_t event_id,
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esp_event_handler_t event_handler);
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/**
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* @brief Posts an event to the system default event loop. The event loop library keeps a copy of event_data and manages
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* the copy's lifetime automatically (allocation + deletion); this ensures that the data the
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* handler recieves is always valid.
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*
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* @param[in] event_base the event base that identifies the event
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* @param[in] event_id the the event id that identifies the event
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* @param[in] event_data the data, specific to the event occurence, that gets passed to the handler
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* @param[in] event_data_size the size of the event data
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* @param[in] ticks_to_wait number of ticks to block on a full event queue
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*
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* @note posting events from an ISR is not supported
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_TIMEOUT: Time to wait for event queue to unblock expired
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* - ESP_ERR_INVALID_ARG: Invalid combination of event base and event id
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* - Others: Fail
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*/
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esp_err_t esp_event_post(esp_event_base_t event_base,
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int32_t event_id,
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void* event_data,
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size_t event_data_size,
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TickType_t ticks_to_wait);
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/**
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* @brief Posts an event to the specified event loop. The event loop library keeps a copy of event_data and manages
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* the copy's lifetime automatically (allocation + deletion); this ensures that the data the
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* handler recieves is always valid.
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*
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* This function behaves in the same manner as esp_event_post_to, except the additional specification of the event loop
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* to post the event to.
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*
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* @param[in] event_loop the event loop to post to
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* @param[in] event_base the event base that identifies the event
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* @param[in] event_id the the event id that identifies the event
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* @param[in] event_data the data, specific to the event occurence, that gets passed to the handler
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* @param[in] event_data_size the size of the event data
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* @param[in] ticks_to_wait number of ticks to block on a full event queue
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*
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* @note posting events from an ISR is not supported
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_TIMEOUT: Time to wait for event queue to unblock expired
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* - ESP_ERR_INVALID_ARG: Invalid combination of event base and event id
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* - Others: Fail
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*/
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esp_err_t esp_event_post_to(esp_event_loop_handle_t event_loop,
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esp_event_base_t event_base,
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int32_t event_id,
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void* event_data,
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size_t event_data_size,
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TickType_t ticks_to_wait);
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/**
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* @brief Dumps statistics of all event loops.
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*
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* Dumps event loop info in the format:
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*
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@verbatim
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event loop
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handler
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handler
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...
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event loop
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handler
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handler
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...
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where:
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event loop
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format: address,name rx:total_recieved dr:total_dropped
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where:
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address - memory address of the event loop
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name - name of the event loop, 'none' if no dedicated task
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total_recieved - number of successfully posted events
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total_dropped - number of events unsucessfully posted due to queue being full
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handler
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format: address ev:base,id inv:total_invoked run:total_runtime
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where:
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address - address of the handler function
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base,id - the event specified by event base and id this handler executes
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total_invoked - number of times this handler has been invoked
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total_runtime - total amount of time used for invoking this handler
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@endverbatim
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*
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* @param[in] file the file stream to output to
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*
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* @note this function is a noop when CONFIG_EVENT_LOOP_PROFILING is disabled
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*
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* @return
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* - ESP_OK: Success
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* - ESP_ERR_NO_MEM: Cannot allocate memory for event loops list
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* - Others: Fail
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*/
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esp_err_t esp_event_dump(FILE* file);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // #ifndef ESP_EVENT_H_
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