ESP32 Forum

Posted: **Fri Jul 18, 2025 8:14 am**

I'm currently using ESP-IDF inside VSCode, and I'm trying to implement OTA over Wi-Fi.
To test this, I'm doing a simple OTA that changes the LED blink interval.
However, I'm facing a panic issue due to a stack overflow. I think the problem is caused by having too much code and trying to implement too many features inside a single task.
I would appreciate it if you could give me some suggestions for improvement.

To resolve (or at least confirm) this issue, I tried to find the overflow checking menu, but I couldn’t locate it.
I also couldn't find a way to enable the Extra options menu in FreeRTOS.
I'm currently using version 5.4.2.

I'm a complete beginner, so I'm not familiar with these tools and also not confident in English. I hope you can understand.

Code: Select all

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/timers.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "esp_wifi.h"
#include "esp_event.h"
#include "esp_netif.h"
#include "nvs_flash.h"
#include "esp_https_ota.h"
#include "esp_http_client.h"

#define LED_GPIO 7
#define WIFI_SSID ""
#define WIFI_PASS ""
#define OTA_BIN_URL ""

static const char *TAG = "OTA_APP";
static volatile bool is_ota_running = false;

static void init_led()
{
    gpio_config_t io_conf = {
        .pin_bit_mask = 1ULL << LED_GPIO,
        .mode = GPIO_MODE_OUTPUT,
        .pull_up_en = GPIO_PULLUP_DISABLE,
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .intr_type = GPIO_INTR_DISABLE};
    gpio_config(&io_conf);
}

static void blink_led_task(void *arg)
{
    while (1)
    {
        gpio_set_level(LED_GPIO, 1);
        vTaskDelay(pdMS_TO_TICKS(is_ota_running ? 100 : 1000));
        gpio_set_level(LED_GPIO, 0);
        vTaskDelay(pdMS_TO_TICKS(is_ota_running ? 100 : 1000));
    }
}

static void wifi_connect()
{
    static bool wifi_initialized = false;
    if (!wifi_initialized)
    {
        esp_netif_init();
        esp_event_loop_create_default();
        esp_netif_create_default_wifi_sta();

        wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
        esp_wifi_init(&cfg);
        wifi_initialized = true;
    }

    wifi_config_t wifi_config = {
        .sta = {
            .ssid = WIFI_SSID,
            .password = WIFI_PASS,
        },
    };

    esp_wifi_set_mode(WIFI_MODE_STA);
    esp_wifi_set_config(WIFI_IF_STA, &wifi_config);
    esp_wifi_start();
    esp_wifi_connect();

    vTaskDelay(pdMS_TO_TICKS(5000)); // 연결 대기
}

static void perform_ota()
{
    esp_http_client_config_t http_cfg = {
        .url = OTA_BIN_URL,
    };
    esp_https_ota_config_t ota_cfg = {
        .http_config = &http_cfg,
    };

    ESP_LOGI(TAG, "Starting OTA...");
    if (esp_https_ota(&ota_cfg) == ESP_OK)
    {
        ESP_LOGI(TAG, "OTA successful. Rebooting...");
        esp_restart();
    }
    else
    {
        ESP_LOGE(TAG, "OTA failed.");
    }
}

static void ota_timer_callback(TimerHandle_t xTimer)
{
    if (is_ota_running)
    {
        ESP_LOGW(TAG, "OTA already running. Skipping.");
        return;
    }

    is_ota_running = true;
    wifi_connect();
    perform_ota();
    esp_wifi_stop();
    is_ota_running = false;
}

void app_main()
{
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
    {
        nvs_flash_erase();
        nvs_flash_init();
    }

    init_led();
    xTaskCreate(&blink_led_task, "blink_led_task", 2048, NULL, 5, NULL);

    TimerHandle_t ota_timer = xTimerCreate("ota_timer", pdMS_TO_TICKS(120000), pdTRUE, NULL, ota_timer_callback);
    xTimerStart(ota_timer, 0);
}

Posted: **Sat Jul 19, 2025 7:13 am**

You may indeed be overflowing the stack of the FreeRTOS timer task as you are doing some heavy operations in the timer callback I suggest to perform WiFi initialization and the actual OTA in a dedicated task with 'enough' stack space.

Posted: **Wed Jul 23, 2025 5:47 am**

You may indeed be overflowing the stack of the FreeRTOS timer task as you are doing some heavy operations in the timer callback I suggest to perform WiFi initialization and the actual OTA in a dedicated task with 'enough' stack space.

Thank you. Since it was a relatively easy problem, I solved it by factoring it out, such as dividing it into different tasks and roles and releasing it.

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