Know if a watchdog reset has tripped - SOLVED

I answer to my own question:

The same library that check the watchdog can read the MCU registry RCAUSE register..

[code]

#include <Adafruit_SleepyDog.h>

  uint8_t resetCause = 0;

  SerialUSB.print(F("Last reboot reason : "));
  resetCause = Watchdog.resetCause();
  if (bitRead(resetCause,0)) {  //Power-on-reset
     SerialUSB.println(F("Power-on-reset"));
  } else if (bitRead(resetCause,1)) {  //Brown-out-detect BOD12
     SerialUSB.println(F("Brown-out-detect BOD12"));
  } else if (bitRead(resetCause,2)) {  //Brown-out-detect BOD33
     SerialUSB.println(F("Brown-out-detect BOD33"));
  } else if (bitRead(resetCause,4)) {  //External reset
     SerialUSB.println(F("External reset"));
  } else if (bitRead(resetCause,5)) {  //Watchdog reset
     SerialUSB.println(F("Watchdog reset"));
  } else if (bitRead(resetCause,6)) {  //System reset
     SerialUSB.println(F("System reset"));
  }

 Little update, seem that the function not give the correct value as i read always as reason a "system reset". Need to investigate why.

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Enrico Michieletti

Enrico Michieletti

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Answered on 1/2/21, 2:52 PM

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Did you get this sorted? What is the solution?

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Aaron

on 1/18/21, 3:32 PM

Hi @Aaron, the solution is the Watchdog.resetCause(). But i'm not sure that it works as it should as by now i've always seen "System reset" as a reboot cause... I've checked the Adafruit_SleepyDog.h code ad it check the correct register, so i need to made some more tests.

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Enrico Michieletti

on 1/18/21, 6:04 PM

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