futureshocked · December 10, 2020 00:40
diff --git a/volatile_sample_a.ino b/volatile_sample_a.ino
 int a;                   //A variable which is also access by an interrupt service routine

 void setup(){
 }

 void loop(){
     a = 1;
     int b;
     b = a + 1;
     Serial.println(b);
 }

 void isr0 ()  {
  a = 5;    
  }
	int a; //A variable which is also access by an interrupt service routine

	void setup(){
	}

	void loop(){
	a = 1;
	int b;
	b = a + 1;
	Serial.println(b);
	}

	void isr0 () {
	a = 5;
	}