ESP32 Watchdog on two cores

poc-esp32-two-cores-watchdog

/**
 * Monopolizing two cores that should reset the watchdog timer.
 */ 

#include "esp_attr.h"
#include "esp_log.h"
#include "esp_system.h"
#include "esp_task_wdt.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "sdkconfig.h"

#define ESP_WDT_TIMEOUT_S 4

const char *TAG = "PoC";

void firstCore(void *args) {
    ESP_ERROR_CHECK(esp_task_wdt_add(NULL));
    ESP_ERROR_CHECK(esp_task_wdt_status(NULL));

    for (uint32_t x = 0; x < UINT32_MAX; x++) {
        ESP_ERROR_CHECK(esp_task_wdt_reset());
        vTaskDelay(10 / portTICK_RATE_MS);
        
        // This lets the the task scheduler to give time to the other task.
        if (x % 1000 == 0) vTaskDelay(10/ portTICK_RATE_MS);
    }

    ESP_ERROR_CHECK(esp_task_wdt_delete(NULL));
}

void secondCore(void *args) {
    ESP_ERROR_CHECK(esp_task_wdt_add(NULL));
    ESP_ERROR_CHECK(esp_task_wdt_status(NULL));

    for (uint32_t x = 0; x < UINT32_MAX; x++) {
        ESP_ERROR_CHECK(esp_task_wdt_reset());
        
        // This lets the the task scheduler to give time to the other task.
        if (x % 1000 == 0) vTaskDelay(10 / portTICK_RATE_MS);
    }
    ESP_ERROR_CHECK(esp_task_wdt_delete(NULL));
}

extern "C" {
void app_main();
}

void app_main() {
    vTaskDelay(2000 / portTICK_RATE_MS);

    ESP_LOGI(TAG, "START app_main!");

    ESP_ERROR_CHECK(esp_task_wdt_init(ESP_WDT_TIMEOUT_S, false));

    xTaskCreatePinnedToCore(&firstCore, "firstCore", configMINIMAL_STACK_SIZE * 6, NULL, 2 | portPRIVILEGE_BIT, NULL, PRO_CPU_NUM);
    xTaskCreatePinnedToCore(&secondCore, "secondCore", configMINIMAL_STACK_SIZE * 6, NULL, 2 | portPRIVILEGE_BIT, NULL, APP_CPU_NUM);
}