WDT_T4 - Watchdog Library for Teensy 4

[profor]

Dear all,
it seems the callback does not fire in my test sketch.
The aim of the sketch is to be able to copy last function name into DMAMEM arrays to see in which function did the WDT fired.
The code is self explanatory i hope and i am using the DMAMEM area as i read somewhere that that memory is kept during code upload (or during wdt reset) while the teensy is powered.

#include "Watchdog_t4.h"
#include "elapsedMillis.h"
#include <Bounce.h>
WDT_T4<WDT3> wdt;

DMAMEM  char  lastFunc[32];
DMAMEM  char  lastLastFunc[32];
DMAMEM  uint32_t  wdfired;
uint32_t  bttn_1_pressed = 0;
uint32_t  bttn_2_pressed = 0;

#define debug_out1  3
#define debug_out2  4


void myCallback() {
  digitalWriteFast(LED_BUILTIN, HIGH);
  wdfired++;    //  indicate the fired wdt
}

elapsedMicros oneMillis;
elapsedMillis wdtRefresh;

#define millisecond         998
#define wdtRefreshInterval  40

const int button_clear = 2;
const int button_1 = 0;
const int button_2 = 1;
Bounce bttn_clear = Bounce(button_clear,10); 
Bounce bttn_1 = Bounce(button_1,10); 
Bounce bttn_2 = Bounce(button_2,10); 


void setup() {
  
  Serial.begin(1);
  pinMode(button_clear, INPUT_PULLUP);
  pinMode(button_1, INPUT_PULLUP);
  pinMode(button_2, INPUT_PULLUP);
  pinMode(debug_out1, OUTPUT);
  pinMode(debug_out2, OUTPUT);
  pinMode(LED_BUILTIN,  OUTPUT);


  while (!Serial);
  
  Serial.print("Begin wdt test / wdtfired: ");
  Serial.println(wdfired);  // at first run, display random data in DMAMEM array
  
  WDT_timings_t config;
  config.window = 30;
  config.timeout = 55;
  config.callback = myCallback;
  wdt.begin(config);
  wdtRefresh = 0;

}

void loop() {

  if (bttn_clear.update()) {
    if (bttn_clear.fallingEdge()) {
      Serial.print(F(" wdfired "));   // at first run, display random data in DMAMEM array
      Serial.print(wdfired);
      wdfired = 0;
      Serial.println(F(" cleared"));
      Serial.println(lastLastFunc);   //  print previous func array
      Serial.println(lastFunc);     //  print last func array
   
/*      for (uint8_t  q = 0;  q < sizeof(lastFunc); q++)  {
        Serial.print(lastFunc[q]);
      } */

      memset(lastFunc,  '.',  sizeof(lastFunc));      //  preset them
      memset(lastLastFunc,  '.',  sizeof(lastLastFunc));   
      
    }
  }

  if (bttn_1.update()) {        //  button debounce
    if (bttn_1.fallingEdge()) {
      Serial.println(F("Button 1 pressed"));  
      bttn_1_pressed++;         //  just increase the variable
    }
  }

    if (bttn_2.update()) {
    if (bttn_2.fallingEdge()) {
      Serial.println(F("Button 2 pressed"));  
      bttn_2_pressed++;
    }
  }
  
  if  (oneMillis > millisecond) {   //  1 ms interval
    oneMillis = 0;
//    digitalWriteFast(LED_BUILTIN, LOW);
    test1();
    test_kurna_snad_to_pojde();
    digitalWrite(debug_out2,  !digitalRead(debug_out2));
  }


  if  (wdtRefresh > wdtRefreshInterval) {   //  wdt feeder 41 ms
    wdtRefresh = 0;
    wdt.feed();
    digitalWrite(debug_out1,  !digitalRead(debug_out1));
  }

}

FASTRUN void  test1() {
  memcpy(lastLastFunc,  lastFunc, sizeof(lastFunc));    //  copy last to previous
  memcpy(lastFunc,  __func__, sizeof(__func__));      //  update last
  while (bttn_1_pressed)  {
    
  }
}

FASTRUN void  test_kurna_snad_to_pojde() {
  memcpy(lastLastFunc,  lastFunc, sizeof(lastFunc));
  memcpy(lastFunc,  __func__, sizeof(__func__));
  while (bttn_2_pressed)  {
    
  }  
}

I am running the code on Teensy 4.1.

Thank You a lot

[profor]

OK my fault, i did not follow the example code here