mirror of
https://github.com/espressif/esp-idf.git
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77 lines
2.4 KiB
C
77 lines
2.4 KiB
C
/*
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* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include <sys/time.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/uart.h"
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#include "esp_sleep.h"
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#include "esp_log.h"
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#include "light_sleep_example.h"
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static void light_sleep_task(void *args)
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{
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while (true) {
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printf("Entering light sleep\n");
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/* To make sure the complete line is printed before entering sleep mode,
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* need to wait until UART TX FIFO is empty:
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*/
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uart_wait_tx_idle_polling(CONFIG_ESP_CONSOLE_UART_NUM);
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/* Get timestamp before entering sleep */
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int64_t t_before_us = esp_timer_get_time();
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/* Enter sleep mode */
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esp_light_sleep_start();
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/* Get timestamp after waking up from sleep */
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int64_t t_after_us = esp_timer_get_time();
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/* Determine wake up reason */
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const char* wakeup_reason;
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switch (esp_sleep_get_wakeup_cause()) {
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case ESP_SLEEP_WAKEUP_TIMER:
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wakeup_reason = "timer";
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break;
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case ESP_SLEEP_WAKEUP_GPIO:
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wakeup_reason = "pin";
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break;
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case ESP_SLEEP_WAKEUP_UART:
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wakeup_reason = "uart";
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/* Hang-up for a while to switch and execuse the uart task
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* Otherwise the chip may fall sleep again before running uart task */
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vTaskDelay(1);
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break;
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default:
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wakeup_reason = "other";
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break;
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}
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printf("Returned from light sleep, reason: %s, t=%lld ms, slept for %lld ms\n",
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wakeup_reason, t_after_us / 1000, (t_after_us - t_before_us) / 1000);
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if (esp_sleep_get_wakeup_cause() == ESP_SLEEP_WAKEUP_GPIO) {
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/* Waiting for the gpio inactive, or the chip will continously trigger wakeup*/
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example_wait_gpio_inactive();
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}
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}
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vTaskDelete(NULL);
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}
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void app_main(void)
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{
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/* Enable wakeup from light sleep by gpio */
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example_register_gpio_wakeup();
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/* Enable wakeup from light sleep by timer */
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example_register_timer_wakeup();
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/* Enable wakeup from light sleep by uart */
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example_register_uart_wakeup();
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xTaskCreate(light_sleep_task, "light_sleep_task", 4096, NULL, 6, NULL);
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}
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