NRF52840 Watchdog Reset code question

Community
#1

Hello,

I have an issue with my code. I have both a soft reset and a hard reset (watchdog)

except watchdog.WatchDogTimeout as e:
microcontroller.reset()

except Exception as e:
supervisor.reload()

My supervisor works just as I want. The software restarts in the case of an exception. The watchdog, though, does not auto run the code after restarting the board. I believe this is by design. But is there a way to get the board to re-run the code, without having to hit the reset switch, if the watchdog fires?

Thanks

#2

Hi there, and Welcome
There is an exploit, Are if you are using the BSP 2.9.2
You can call the system sleep function and not use a delay and with the interrupt pin don’t use the gpio pin number. :face_with_peeking_eye:
The watchdog can call the MCU sleep and it will briefly (ms.) then reset.
or have the watchdog call the SoftDevice system reset maybe?
HTH
GL :slight_smile: PJ

look up, the 2.9.2 breaks interrupt ithink

#3

I am having a hard time following…
I don’t know what a BSP 2.9.2 is.

The only hardware I have is NRF52840 and a board of my own design. I am not using any other modules.

I tried the soft reset command in the watchdog, it didn’t work.

#4

Hi there,
Are you using Arduino IDE?
either way if you call the Sleep function when the watchdog fires, the MCU will be reset.
Like this:

void goToPowerOff() {
  //sleepFlash();
  setLedRGB(false, false, false);
  Serial.println("Going to SLEEP System OFF  Tap to WAKE \n");
  display.clearDisplay();
  display.setCursor(10, 8);
  display.setTextSize(3);
  display.print("SLEEP");
  display.display();
  delay(500);
  display.clearDisplay();
  display.display();
  setupDoubleTapInterrupt();  // not needed here, if already applied..
  delay(2000);                // delay seems important to apply settings, before going to System OFF
  //Ensure interrupt pin from IMU is set to wake up device
  // nrf_gpio_cfg_sense_input(digitalPinToInterrupt(int2Pin), NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);
  delay(2000);  // delay seems important to apply settings, before going to System OFF
  uint32_t pin = D2;
  pin = g_ADigitalPinMap[pin];
  nrf_gpio_cfg_sense_input(pin, NRF_GPIO_PIN_PULLDOWN, NRF_GPIO_PIN_SENSE_HIGH);
  delay(2000);  //15 seconds before turns off (if USB is plugged in, that circuit will still draw 2mA)
  Serial.println(" You're NOT doing anything, I'll Sleep.");
  delay(2000);
  sd_power_system_off();
  NRF_POWER->SYSTEMOFF = 1;
}

HTH
GL :slight_smile: PJ
be sure to change the HIGH NRF_GPIO_PIN_SENSE_HIGH to LOW and remove the delays that are noted for good Sleep!