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iot_button_add_custom_cb() function
Syntax
esp_err_t iot_button_add_custom_cb(button_handle_t btn_handle,
uint32_t press_sec,
button_cb cb,
void* arg);
Implemented in ![]()
button.c:404
Return value
- ESP_OK Success - ESP_FAIL Parameter error
Notes
Button callback functions execute in the context of the timer service task. It is therefore essential that button callback functions never attempt to block. For example, a button callback function must not call vTaskDelay(), vTaskDelayUntil(), or specify a non zero block time when accessing a queue or a semaphore.