91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* Light sleep example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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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 "esp_sleep.h"
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#include "esp_log.h"
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#include "rom/uart.h"
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#include "driver/rtc_io.h"
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/* Most development boards have "boot" button attached to GPIO0.
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* You can also change this to another pin.
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*/
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#define BUTTON_GPIO_NUM_DEFAULT 0
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/* "Boot" button on GPIO0 is active low */
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#define BUTTON_WAKEUP_LEVEL_DEFAULT 0
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void app_main()
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{
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/* Configure the button GPIO as input, enable wakeup */
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const int button_gpio_num = BUTTON_GPIO_NUM_DEFAULT;
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const int wakeup_level = BUTTON_WAKEUP_LEVEL_DEFAULT;
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gpio_config_t config = {
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.pin_bit_mask = BIT64(button_gpio_num),
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.mode = GPIO_MODE_INPUT
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};
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ESP_ERROR_CHECK(gpio_config(&config));
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gpio_wakeup_enable(button_gpio_num,
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wakeup_level == 0 ? GPIO_INTR_LOW_LEVEL : GPIO_INTR_HIGH_LEVEL);
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while (true) {
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/* Wake up in 2 seconds, or when button is pressed */
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esp_sleep_enable_timer_wakeup(2000000);
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esp_sleep_enable_gpio_wakeup();
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/* Wait until GPIO goes high */
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if (rtc_gpio_get_level(button_gpio_num) == wakeup_level) {
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printf("Waiting for GPIO%d to go high...\n", button_gpio_num);
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do {
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vTaskDelay(pdMS_TO_TICKS(10));
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} while (rtc_gpio_get_level(button_gpio_num) == wakeup_level);
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}
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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_tx_wait_idle(CONFIG_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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/* Execution continues here after wakeup */
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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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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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}
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}
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