esp-idf/examples/system/light_sleep/main/gpio_wakeup.c

/*
 * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Unlicense OR CC0-1.0
 */
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_check.h"
#include "esp_sleep.h"
#include "driver/gpio.h"

/* Most development boards have "boot" button attached to GPIO0.
 * You can also change this to another pin.
 */
#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32C2 || CONFIG_IDF_TARGET_ESP32H2 \
    || CONFIG_IDF_TARGET_ESP32C6
#define BOOT_BUTTON_NUM         9
#elif CONFIG_IDF_TARGET_ESP32P4
#define BOOT_BUTTON_NUM         35
#else
#define BOOT_BUTTON_NUM         0
#endif

/* Use boot button as gpio input */
#define GPIO_WAKEUP_NUM         BOOT_BUTTON_NUM
/* "Boot" button is active low */
#define GPIO_WAKEUP_LEVEL       0

static const char *TAG = "gpio_wakeup";

void example_wait_gpio_inactive(void)
{
    printf("Waiting for GPIO%d to go high...\n", GPIO_WAKEUP_NUM);
    while (gpio_get_level(GPIO_WAKEUP_NUM) == GPIO_WAKEUP_LEVEL) {
        vTaskDelay(pdMS_TO_TICKS(10));
    }
}

esp_err_t example_register_gpio_wakeup(void)
{
    /* Initialize GPIO */
    gpio_config_t config = {
            .pin_bit_mask = BIT64(GPIO_WAKEUP_NUM),
            .mode = GPIO_MODE_INPUT,
            .pull_down_en = false,
            .pull_up_en = false,
            .intr_type = GPIO_INTR_DISABLE
    };
    ESP_RETURN_ON_ERROR(gpio_config(&config), TAG, "Initialize GPIO%d failed", GPIO_WAKEUP_NUM);

    /* Enable wake up from GPIO */
    ESP_RETURN_ON_ERROR(gpio_wakeup_enable(GPIO_WAKEUP_NUM, GPIO_WAKEUP_LEVEL == 0 ? GPIO_INTR_LOW_LEVEL : GPIO_INTR_HIGH_LEVEL),
                        TAG, "Enable gpio wakeup failed");
    ESP_RETURN_ON_ERROR(esp_sleep_enable_gpio_wakeup(), TAG, "Configure gpio as wakeup source failed");

    /* Make sure the GPIO is inactive and it won't trigger wakeup immediately */
    example_wait_gpio_inactive();
    ESP_LOGI(TAG, "gpio wakeup source is ready");

    return ESP_OK;
}