volatileSwitchTest.ino

// https://github.com/combs/Arduino-Watchdog-Handler
#include "watchdogHandler.h"
#include <avr/wdt.h>

volatile uint8_t canary = 0;
uint8_t scratch = 0;
bool badness = false;

void setup() {
  wdt_disable();
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("hallo");
  delay(1000);
  setup_watchdog(WDTO_15MS);
}

void loop() {
  
   canary = random(10);
  
   // how to test if the interrupt is occurring not here but during the switch?
  
   switch(canary) {

      case 0:
       canary = 10;
        break;
        
      case 1:
       scratch = random() + 11;
        break;

      case 2:
       scratch = random() + 12;
        break;

      case 3:
       scratch = random() + 13;
        break;

      case 4:
       scratch = random() + 14;
        break;

      case 5:
       scratch = random() + 15;
        break;

      case 6:
       scratch = random() + 16;
        break;

      case 7:
       scratch = random() + 17;
        break;

      case 8:
       scratch = random() + 18;
        break;

      case 9:
       scratch = random() + 19;
        break;

      case 10:
       scratch = random() + 20;
        break;

      default: 
        
        badness = true;
        break;
        
   }

   if (badness) {
      Serial.println("A badness occurred.");
      badness = false;
   }
   
}

ISR(WDT_vect) {
   canary = 100;
}