Watchdog_Reset_Reason.ino

#include <rom/rtc.h>
#include <Ticker.h>


#define uS_TO_S_FACTOR 1000000  /* Conversion factor for micro seconds to seconds */


void verbose_print_reset_reason(int reason)
{
  switch ( reason)
  {
    case 1  : Serial.println ("Vbat power on reset");break;
    case 3  : Serial.println ("Software reset digital core");break;
    case 4  : Serial.println ("Legacy watch dog reset digital core");break;
    case 5  : Serial.println ("Deep Sleep reset digital core");break;
    case 6  : Serial.println ("Reset by SLC module, reset digital core");break;
    case 7  : Serial.println ("Timer Group0 Watch dog reset digital core");break;
    case 8  : Serial.println ("Timer Group1 Watch dog reset digital core");break;
    case 9  : Serial.println ("RTC Watch dog Reset digital core");break;
    case 10 : Serial.println ("Instrusion tested to reset CPU");break;
    case 11 : Serial.println ("Time Group reset CPU");break;
    case 12 : Serial.println ("Software reset CPU");break;
    case 13 : Serial.println ("RTC Watch dog Reset CPU");break;
    case 14 : Serial.println ("for APP CPU, reseted by PRO CPU");break;
    case 15 : Serial.println ("Reset when the vdd voltage is not stable");break;
    case 16 : Serial.println ("RTC Watch dog reset digital core and rtc module");break;
    default : Serial.println ("NO_MEAN");
  }
}

Ticker secondTick;

portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;

volatile int watchdogCounter;
int totalwatchdogCounter;
 
void IRAM_ATTR ISRwatchdog() {
  portENTER_CRITICAL_ISR(&mux);
  watchdogCounter++;
  portEXIT_CRITICAL_ISR(&mux);
 
}
 
void setup() {
 
  Serial.begin(115200);
  
  Serial.println("CPU0 reset reason:");
  //print_reset_reason(rtc_get_reset_reason(0));
  verbose_print_reset_reason(rtc_get_reset_reason(0));

  Serial.println("CPU1 reset reason:");
  //print_reset_reason(rtc_get_reset_reason(1));
  verbose_print_reset_reason(rtc_get_reset_reason(1));

  /*
  // Set ESP32 to go to deep sleep to see a variation
  // in the reset reason. Device will sleep for 5 seconds.
  esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_OFF);
  Serial.println("Going to sleep");
  esp_deep_sleep(5 * uS_TO_S_FACTOR);
  */


  secondTick.attach(1, ISRwatchdog);  //watchdog  ISR triggers every 1 second

  delay(50 * 1000);  //test watchdog
}
 
void loop() {
 
  if (watchdogCounter > 45) 
  {
 
    totalwatchdogCounter++;

    Serial.println("watchdog Triggered");

    Serial.println("Watchdog restart");
        
    ESP.restart();
    
  }

    //watchdogCounter = 0;
  
}

//https://github.com/espressif/arduino-esp32/blob/master/libraries/ESP32/examples/ResetReason/ResetReason.ino