// 1. Define the event handler
void run_on_event(void* handler_arg, esp_event_base_t base, int32_t id, void* event_data)
{
// Event handler logic
}
void app_main()
{
// 2. A configuration structure of type esp_event_loop_args_t is needed to specify the properties of the loop to be
// created. A handle of type esp_event_loop_handle_t is obtained, which is needed by the other APIs to reference the loop
// to perform their operations on.
esp_event_loop_args_t loop_args = {
.queue_size = ...,
.task_name = ...
.task_priority = ...,
.task_stack_size = ...,
.task_core_id = ...
};
esp_event_loop_handle_t loop_handle;
esp_event_loop_create(&loop_args, &loop_handle)
// 3. Register event handler defined in (1). MY_EVENT_BASE and MY_EVENT_ID specifies a hypothetical
// event that handler run_on_event should execute on when it gets posted to the loop.
esp_event_handler_register_with(loop_handle, MY_EVENT_BASE, MY_EVENT_ID, run_on_event, ...);
...
// 4. Post events to the loop. This queues the event on the event loop. At some point in time
// the event loop executes the event handler registered to the posted event, in this case run_on_event.
// For simplicity sake this example calls esp_event_post_to from app_main, but posting can be done from
// any other tasks (which is the more interesting use case).
esp_event_post_to(loop_handle, MY_EVENT_BASE, MY_EVENT_ID, ...);
...
// 5. Unregistering an unneeded handler
esp_event_handler_unregister_with(loop_handle, MY_EVENT_BASE, MY_EVENT_ID, run_on_event);
...
// 6. Deleting an unneeded event loop
esp_event_loop_delete(loop_handle);
}
