volatile uint32_t count=0;
void incrementCount(){
  count++;
}
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(2, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(2), incrementCount, RISING);
}

void loop() {
  Serial.print("Interrupt count:");
  noInterrupts();
  Serial.println(count);
  interrupts();
  // put your main code here, to run repeatedly:
  delay(100); // this speeds up the simulation
}