ESP8266 Community Forum

Posted: **Thu May 14, 2020 3:54 pm**

Hi folks,

I'm having trouble figuring out why my sketch keeps on crashing at random intervals
I already did a CrashDecode but unfortunately that isn't tooooo much help on my skill level.

basically I'm getting this exception:

Code: Select all

Exception (0):
epc1=0x4000e25d epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffefac0 end: 3ffefe50 offset: 0190
3ffefc50:  ffffffff 3ffeecbc 3ffeecb8 40100ece  
3ffefc60:  3ffe9934 7fffffff 00000000 00000020  
3ffefc70:  ffffffff 0000000f 00000000 40100404  
3ffefc80:  c003b025 00000000 0000001f 40100168  
3ffefc90:  00000005 00000000 00000020 00000022  
3ffefca0:  3fffc200 40100340 3fffc258 4000050c  
3ffefcb0:  4000067d 00000030 00000010 ffffffff  
3ffefcc0:  00000000 f3b9abe0 38d79cc3 00000000  
3ffefcd0:  00004bc6 f3b9abe0 00000000 fffffffe  
3ffefce0:  0000be93 3fffc6fc 8f2dabe0 4bc6a7f0  
3ffefcf0:  00000000 c008da42 00000000 00000030  
3ffefd00:  402011c8 14c975f8 60000304 00000005  
3ffefd10:  00004bc6 00000000 00000000 fffffffe  
3ffefd20:  00000000 3fffc6fc 00000000 3ffee990  
3ffefd30:  00000000 3fffdad0 3ffee9d0 00000030  
3ffefd40:  40102838 3fffc200 00000022 00000000  
3ffefd50:  4023447a 00000030 0000001b ffffffff  
3ffefd60:  40201050 3ffeee30 402011d8 00000000  
3ffefd70:  00000000 00000000 00000000 fffffffe  
3ffefd80:  ffffffff 3fffc6fc 00000001 3ffe85bc  
3ffefd90:  00000000 3fffdad0 3ffee9d0 00000030  
3ffefda0:  c008da42 4bc6a7f0 c008da42 00000000  
3ffefdb0:  c008da42 00000000 4bc6a7f0 00000000  
3ffefdc0:  00000000 00000001 401001e4 4bc6a7f0  
3ffefdd0:  00000000 00000000 3ffeebc4 40206a05  
3ffefde0:  38d79cc2 00000000 00001388 411f1e8d  
3ffefdf0:  00000000 00000000 00000000 3ffe84f0  
3ffefe00:  3fffdad0 00000000 3ffe84f0 40206b5a  
3ffefe10:  00000000 00000000 00000001 40100168  
3ffefe20:  3fffdad0 00000000 3ffee990 3ffee9d0  
3ffefe30:  3fffdad0 00000000 3ffee990 402011f8  
3ffefe40:  feefeffe feefeffe 3ffe85bc 40100515  
<<<stack<<<

which according to the Decoder translates to this:

Code: Select all

Exception 0: Illegal instruction
PC: 0x4000e25d
EXCVADDR: 0x00000000

Decoding stack results
0x40100ece: onPowerPulse() at master.ino line 222
0x40100404: interrupt_handler(void*) at ../esp8266/cores/esp8266/interrupts.h line 29
0x40100340: interrupt_handler(void*) at ../esp8266/cores/esp8266/core_esp8266_wiring_digital.cpp line 135
0x40210369: WiFiClient::operator bool() at ../esp8266/libraries/ESP8266WiFi/src/WiFiClient.cpp line 349
0x4020a8d8: WiFiClient::connected() at ../esp8266/libraries/ESP8266WiFi/src/WiFiClient.cpp line 333
0x401001e4: millis() at ../esp8266/cores/esp8266/core_esp8266_wiring.cpp line 185
0x40206a05: esp8266webserver::ESP8266WebServerTemplate ::handleClient() at ../esp8266/libraries/ESP8266WebServer/src/ESP8266WebServer-impl.h line 307
0x40206b5a: loop() at master.ino line 422
0x40100168: ets_post(uint8, ETSSignal, ETSParam) at ../esp8266/cores/esp8266/core_esp8266_main.cpp line 177
0x402011f8: loop_wrapper() at ../esp8266/cores/esp8266/core_esp8266_main.cpp line 197

can somebody help me shed some light what I'm even supposed to look at here?
below the sections which i *think* are the problematic ones

the sketch should be fairly easy, I'm trying to read 2 DHT humidity sensors and also keep track of an S0 enegry meter by interrupt.

most of the lines/files in the Decoder output were not written by me / are part of the esp compiler package, the 2 snippets that I think are relevant are

the s0 interrupt function looks like this: (which is the first line in the decoders output on line 222

Code: Select all

void ICACHE_RAM_ATTR onPowerPulse() {

  //used to measure time between pulses.
  lastTime = pulseTime;
  pulseTime = millis();

  //pulseCounter
  pulseCount++;

  //Calculate power
  double powertmp = (60*60*1000 / (pulseTime - lastTime))/ppwh;

  Serial.print("S0 interrupt, Powervalue: ");
  Serial.print(powertmp);
  Serial.println(" Wh");

  //check if value is reasonable, i.e. avoid reboot nirvana values
  if ( powertmp > 3000 || powertmp < 2 ) {
    return;
  }

  power = powertmp;

  //Find kwh elapsed
  elapsedkWh = (1.0 * pulseCount/(ppwh * 1000)); //multiply by 1000 to convert pulses per wh to kwh

}

and here is the full loop code: line 422 is marked where the second DHT block starts

Code: Select all

void loop(void){
  httpServer.handleClient();

  if( millis() >= rebootInterval ) {
    ESP.restart();
  }


  // read front DHT
  if ( millis() > front.timer ) {
    //Serial.print("DHT front ... ");

    //// Read sensor
   float tmpTemp = dhtfront.readTemperature();
   float tmpHumidity = dhtfront.readHumidity();

    // Check if any reads failed and exit early (to try again).
    if (isnan(tmpHumidity) or isnan(tmpTemp)) {
      //Serial.println("Failed to read front sensor!");
      front.timer = millis() + dhtDelayFail;    // if sensor reading failed try again after FAILFREQUENCY
    } else {
      //Serial.println("OK");

      front.temp = tmpTemp;
      front.humidity = tmpHumidity;

      front.timer = millis() + dhtDelayRead;

      // Compute heat index and dewpoint
      front.dew = dewPoint(front.temp, front.humidity);
      front.hi = dhtfront.computeHeatIndex(front.temp, front.humidity, false);

      printDhtSerial(front);   //// printing it all on the Serial if we actually got values
    }

  }


  // read door DHT
  if ( millis() > door.timer ) {                      // <<<< line 422 in sketch that is being complained about in the decode
    //Serial.print("DHT door ... ");

    //// Read sensor
   float tmpTemp = dhtdoor.readTemperature();
   float tmpHumidity = dhtdoor.readHumidity();

    // Check if any reads failed and exit early (to try again).
    if (isnan(tmpHumidity) or isnan(tmpTemp)) {
      //Serial.println("Failed to read door sensor!");
      door.timer = millis() + dhtDelayFail;    // if sensor reading failed try again after FAILFREQUENCY
    } else {
      //Serial.println("OK");

      door.temp = tmpTemp;
      door.humidity = tmpHumidity;

      door.timer = millis() + dhtDelayRead;

      // Compute heat index and dewpoint
      door.dew = dewPoint(door.temp, door.humidity);
      door.hi = dhtdoor.computeHeatIndex(door.temp, door.humidity, false);

      printDhtSerial(door);   //// printing it all on the Serial if we actually got values
    }

  }


  if ((relay1.offDelay > 0) && ((millis() - relay1.lastSwitch) > relay1.offDelay)) {
    relay1.status = OFF;
    digitalWrite(relay1.pin, relay1.status);
  }

}

but I don't even know where to start why these 2 would cause a crash

thanks a lot in advance.

the sketch is a bit longer but it seems to always crash with the same stack trace pointing to the same 2 problematic lines

happy to share the whole sketch though if that is helpful.

Posted: **Thu Feb 04, 2021 7:23 am**

Hi Mitico - I see no one has answered your query.
I have a similar problem with much simpler code.

My board just keeps crashing continuously. Never gets anywhere at all.
I have tried many different sketches published on the net. All have the same problem.

Did you ever solve your issue?

I've got the most basic interrupt on an esp8266 D1 (development board)
The code is as follows:

Code: Select all

/********************interrupt.ino***********************/
const byte interruptPin = 2;
int numberOfInterrupts = 0;

//variable interruptCounter will be used in the interrupt service routine. Thus, it needs to be declared as "volatile"
volatile boolean interruptFlag = 0;

void setup() {

  Serial.begin(115200);

//  pinMode(interruptPin, INPUT_PULLUP);
//  makes no difference 
 
  attachInterrupt(digitalPinToInterrupt(interruptPin), myInterruptServiceRoutine, RISING);
   
}

void myInterruptServiceRoutine() {
  interruptFlag = 1;
}

void loop() {

  if (interruptFlag == 1) {

    interruptFlag = 0;
    numberOfInterrupts++;

    Serial.print("An interrupt has occurred. Total: ");
    Serial.println(numberOfInterrupts);
  }

}

Posted: **Sat Feb 06, 2021 2:29 pm**

you both should add a delay(xxx) call inside the loop function, code executing for too long will trigger the ESP8266 watchdog

Posted: **Sun Feb 07, 2021 3:29 am**

as there is no endless loop in loop() (e.g. while(1)) there is no need for any delay()
but AFAIK interrupt service routines need to be in RAM so they can be called anytime
try attributing them like this:
void ICACHE_RAM_ATTR isr()

ESP8266 Community Forum

esp8266 keeps crashing

esp8266 keeps crashing

Re: esp8266 keeps crashing

Re: esp8266 keeps crashing

Re: esp8266 keeps crashing