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509 lines
24 KiB
C
509 lines
24 KiB
C
/*
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* SPDX-FileCopyrightText: 2018-2024 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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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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#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_INVALID_ARG: event_loop_args or event_loop was NULL
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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, must not be NULL
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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_ERR_INVALID_STATE: Default event loop has already been created
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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(void);
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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(void);
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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 the allotted time waiting on the event queue.
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* Once an event has been dequeued, 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 dequeued
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* event, and (2) during dispatch of the dequeued 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 allotted time + amount of time required to dispatch
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* the last dequeued 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, must not be NULL
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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 (legacy).
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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 (legacy).
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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, must not be NULL
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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 Register an instance of event handler to a specific 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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* Besides the error, the function returns an instance object as output parameter to identify each registration.
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* This is necessary to remove (unregister) the registration before the event loop is deleted.
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*
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* Registering multiple handlers to events, registering a single handler to multiple events as well as registering
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* the same handler to the same event multiple times is possible.
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* Each registration yields a distinct instance object which identifies it over the registration
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* lifetime.
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*
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* @param[in] event_loop the event loop to register this handler function to, must not be NULL
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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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* @param[out] instance An event handler instance object related to the registered event handler and data, can be NULL.
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* This needs to be kept if the specific callback instance should be unregistered before deleting the whole
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* event loop. Registering the same event handler multiple times is possible and yields distinct instance
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* objects. The data can be the same for all registrations.
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* If no unregistration is needed, but the handler should be deleted when the event loop is deleted,
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* instance can be NULL.
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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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* @note Calling this function with instance set to NULL is equivalent to calling esp_event_handler_register_with.
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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 or instance is NULL
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* - Others: Fail
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*/
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esp_err_t esp_event_handler_instance_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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esp_event_handler_instance_t *instance);
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/**
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* @brief Register an instance of event handler to the default loop.
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*
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* This function does the same as esp_event_handler_instance_register_with, except that it registers the
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* handler to the default event loop.
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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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* @param[out] instance An event handler instance object related to the registered event handler and data, can be NULL.
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* This needs to be kept if the specific callback instance should be unregistered before deleting the whole
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* event loop. Registering the same event handler multiple times is possible and yields distinct instance
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* objects. The data can be the same for all registrations.
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* If no unregistration is needed, but the handler should be deleted when the event loop is deleted,
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* instance can be NULL.
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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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* @note Calling this function with instance set to NULL is equivalent to calling esp_event_handler_register.
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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 or instance is NULL
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* - Others: Fail
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*/
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esp_err_t esp_event_handler_instance_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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esp_event_handler_instance_t *instance);
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/**
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* @brief Unregister a handler with the system event loop (legacy).
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*
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* Unregisters a handler, so it will no longer be called during dispatch.
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* Handlers can be unregistered for any combination of event_base and event_id which were previously registered.
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* To unregister a handler, the event_base and event_id arguments must match exactly the arguments passed to
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* esp_event_handler_register() when that handler was registered. Passing ESP_EVENT_ANY_BASE and/or ESP_EVENT_ANY_ID
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* will only unregister handlers that were registered with the same wildcard arguments.
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*
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* @note When using ESP_EVENT_ANY_ID, handlers registered to specific event IDs using the same base will not be
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* unregistered. When using ESP_EVENT_ANY_BASE, events registered to specific bases will also not be
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* unregistered. This avoids accidental unregistration of handlers registered by other users or components.
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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,
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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 Unregister a handler from a specific event loop (legacy).
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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, must not be NULL
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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 Unregister a handler instance from a specific event loop.
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*
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* Unregisters a handler instance, so it will no longer be called during dispatch.
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* Handler instances can be unregistered for any combination of event_base and event_id which were previously
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* registered. To unregister a handler instance, the event_base and event_id arguments must match exactly the
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* arguments passed to esp_event_handler_instance_register() when that handler instance was registered.
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* Passing ESP_EVENT_ANY_BASE and/or ESP_EVENT_ANY_ID will only unregister handler instances that were registered
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* with the same wildcard arguments.
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*
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* @note When using ESP_EVENT_ANY_ID, handlers registered to specific event IDs using the same base will not be
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* unregistered. When using ESP_EVENT_ANY_BASE, events registered to specific bases will also not be
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* unregistered. This avoids accidental unregistration of handlers registered by other users or components.
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*
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* @param[in] event_loop the event loop with which to unregister this handler function, must not be NULL
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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] instance the instance object of the registration to be unregistered
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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_instance_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_instance_t instance);
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/**
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* @brief Unregister a handler from the system event loop.
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*
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* This function does the same as esp_event_handler_instance_unregister_with, except that it unregisters the
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* handler instance from the default event loop.
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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] instance the instance object of the registration to be unregistered
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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_instance_unregister(esp_event_base_t event_base,
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int32_t event_id,
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esp_event_handler_instance_t instance);
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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 receives 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 event ID that identifies the event
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* @param[in] event_data the data, specific to the event occurrence, 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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* @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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* queue full when posting from ISR
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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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const 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 receives is always valid.
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*
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* This function behaves in the same manner as esp_event_post, 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, must not be NULL
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* @param[in] event_base the event base that identifies the event
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* @param[in] event_id the event ID that identifies the event
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* @param[in] event_data the data, specific to the event occurrence, 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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* @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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* queue full when posting from ISR
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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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const 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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#if CONFIG_ESP_EVENT_POST_FROM_ISR
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/**
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* @brief Special variant of esp_event_post for posting events from interrupt handlers.
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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 event ID that identifies the event
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* @param[in] event_data the data, specific to the event occurrence, that gets passed to the handler
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* @param[in] event_data_size the size of the event data; max is 4 bytes
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* @param[out] task_unblocked an optional parameter (can be NULL) which indicates that an event task with
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* higher priority than currently running task has been unblocked by the posted event;
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* a context switch should be requested before the interrupt is existed.
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*
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* @note this function is only available when CONFIG_ESP_EVENT_POST_FROM_ISR is enabled
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* @note when this function is called from an interrupt handler placed in IRAM, this function should
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* be placed in IRAM as well by enabling CONFIG_ESP_EVENT_POST_FROM_IRAM_ISR
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*
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* @return
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* - ESP_OK: Success
|
|
* - ESP_FAIL: Event queue for the default event loop full
|
|
* - ESP_ERR_INVALID_ARG: Invalid combination of event base and event ID,
|
|
* data size of more than 4 bytes
|
|
* - Others: Fail
|
|
*/
|
|
esp_err_t esp_event_isr_post(esp_event_base_t event_base,
|
|
int32_t event_id,
|
|
const void *event_data,
|
|
size_t event_data_size,
|
|
BaseType_t *task_unblocked);
|
|
|
|
/**
|
|
* @brief Special variant of esp_event_post_to for posting events from interrupt handlers
|
|
*
|
|
* @param[in] event_loop the event loop to post to, must not be NULL
|
|
* @param[in] event_base the event base that identifies the event
|
|
* @param[in] event_id the event ID that identifies the event
|
|
* @param[in] event_data the data, specific to the event occurrence, that gets passed to the handler
|
|
* @param[in] event_data_size the size of the event data
|
|
* @param[out] task_unblocked an optional parameter (can be NULL) which indicates that an event task with
|
|
* higher priority than currently running task has been unblocked by the posted event;
|
|
* a context switch should be requested before the interrupt is existed.
|
|
*
|
|
* @note this function is only available when CONFIG_ESP_EVENT_POST_FROM_ISR is enabled
|
|
* @note when this function is called from an interrupt handler placed in IRAM, this function should
|
|
* be placed in IRAM as well by enabling CONFIG_ESP_EVENT_POST_FROM_IRAM_ISR
|
|
*
|
|
* @return
|
|
* - ESP_OK: Success
|
|
* - ESP_FAIL: Event queue for the loop full
|
|
* - ESP_ERR_INVALID_ARG: Invalid combination of event base and event ID,
|
|
* data size of more than 4 bytes
|
|
* - Others: Fail
|
|
*/
|
|
esp_err_t esp_event_isr_post_to(esp_event_loop_handle_t event_loop,
|
|
esp_event_base_t event_base,
|
|
int32_t event_id,
|
|
const void *event_data,
|
|
size_t event_data_size,
|
|
BaseType_t *task_unblocked);
|
|
#endif
|
|
|
|
/**
|
|
* @brief Dumps statistics of all event loops.
|
|
*
|
|
* Dumps event loop info in the format:
|
|
*
|
|
@verbatim
|
|
event loop
|
|
handler
|
|
handler
|
|
...
|
|
event loop
|
|
handler
|
|
handler
|
|
...
|
|
|
|
where:
|
|
|
|
event loop
|
|
format: address,name rx:total_received dr:total_dropped
|
|
where:
|
|
address - memory address of the event loop
|
|
name - name of the event loop, 'none' if no dedicated task
|
|
total_received - number of successfully posted events
|
|
total_dropped - number of events unsuccessfully posted due to queue being full
|
|
|
|
handler
|
|
format: address ev:base,id inv:total_invoked run:total_runtime
|
|
where:
|
|
address - address of the handler function
|
|
base,id - the event specified by event base and ID this handler executes
|
|
total_invoked - number of times this handler has been invoked
|
|
total_runtime - total amount of time used for invoking this handler
|
|
|
|
@endverbatim
|
|
*
|
|
* @param[in] file the file stream to output to
|
|
*
|
|
* @note this function is a noop when CONFIG_ESP_EVENT_LOOP_PROFILING is disabled
|
|
*
|
|
* @return
|
|
* - ESP_OK: Success
|
|
* - ESP_ERR_NO_MEM: Cannot allocate memory for event loops list
|
|
* - Others: Fail
|
|
*/
|
|
esp_err_t esp_event_dump(FILE *file);
|
|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
#endif
|
|
|
|
#endif // #ifndef ESP_EVENT_H_
|