#define digitalInput 32
hw_timer_t*timer=NULL;

int t=0;
volatile bool interrupt = false;
volatile bool once = false;
volatile bool timer_running = false;

void IRAM_ATTR leerdigitalInput() {
  once = true;
  interrupt = true;
}

void IRAM_ATTR timerOn() {
  t++;
}

void setup() {
  Serial.begin(115200);
  pinMode(digitalInput, INPUT_PULLDOWN);
  attachInterrupt(digitalPinToInterrupt(digitalInput), leerdigitalInput, CHANGE);

  timer = timerBegin(80000);
  timerAttachInterrupt(timer, &timerOn);
  timerAlarm(timer, 80, true, 0);
  
  t=0;
}

void loop() {
  if(interrupt && digitalRead(digitalInput) == 1 && !timer_running) {
    timerStart(timer);
    once = true;
    t = 0;
    //Serial.print("in");
    timer_running = true;

  }
  if(interrupt && once && digitalRead(digitalInput) == 0) {
    Serial.println(t);
    interrupt = false;
    once = false;
    timer_running = false;
    //Serial.print("out");

    timerStop(timer);
    t=0;
  }
}