uart: support light sleep on esp32s3

examples/system/light_sleep/main/gpio_wakeup.c

@@ -0,0 +1,58 @@
+/*
+ * 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
+#define BOOT_BUTTON_NUM         9
+#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;
+}