ESP8266 Community Forum

- Mon Jul 06, 2015 4:27 pm #22628 I want the ESP to reboot, if the code stucks, or similiar. Like you described.
I made a little testprogramm, but there was no reboot until 90 seconds of delay in the loop. Looks like there is no watchdog working.

Code: Select allint deltime = 1000;
void setup() {
  Serial.begin(115200);
  Serial.println("Programmstart ");
}
void loop() {
  Serial.print("DelTime = ");
  Serial.println(deltime);
  delay(deltime);
  deltime=deltime+1000;
}

If application code takes too long to return control to the OS

What is ment by this? Is this, if it lasts too long to start a new loop?

my ESP8266: ESP-01 V2 / ESP-12E (NodeMCU)
ESP8266 Arduino add-on
Arduino IDE 1.6.5

- Mon Jul 06, 2015 4:32 pm #22629 The loop() is not a good example, because probably the watchdog is been resetted on every loop and also by the delay() function. You can test it by doing a "for (int i = 0; i < 1000000; i++) { __asm__ volatile ("nop"); } " instead.

EDIT : I've just give this a try, but oooups ! 1 million wasn't enough, 100 million is better.
But beware : I've saw sometimes the watchdog doing reset, but the reset was also hanging sometime.
So, it is probably not a good way to force reset, the ESP.reset() function is much better.

- Tue Jul 07, 2015 5:13 am #22673

So, it is probably not a good way to force reset, the ESP.reset() function is much better.

But to use the ESP.reset() you need "control "about the software. And then, there is no need for a watchdog.

my ESP8266: ESP-01 V2 / ESP-12E (NodeMCU)
ESP8266 Arduino add-on
Arduino IDE 1.6.5

- Tue Jul 07, 2015 9:07 am #22686 This might be a useless post ... but I note that the SDK documents a hardware timer function. See hw_timer_init(). It may be that this causes an interrupt in software where you can perform your reset.

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