#define led 14
#define pulsador 32
hw_timer_t*timer = NULL;

int t = 0;
volatile bool once = false;
volatile bool interrupt_down = false;

void IRAM_ATTR leerPulsador() {
  interrupt_down = true;
  once = true;
}

void IRAM_ATTR timerOn() {
  t++;
}

void setup() {
  Serial.begin(115200);
  pinMode (pulsador, INPUT_PULLUP);
  pinMode (led, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(pulsador), leerPulsador, FALLING);
  timer = timerBegin(80000);
  timerAttachInterrupt(timer, &timerOn);
  timerAlarm(timer, 80, true, 0);
  t = 0;
}

void loop() {
  if (interrupt_down) { //pulsado
    digitalWrite(led, !digitalRead(led));
    t=0;
    timerStart(timer);
    interrupt_down = false;
  }

  if (once && digitalRead(pulsador) == 1) { //soltado y 1 vez mostrar
      Serial.print("time: ");
      Serial.println(t);
      t = 0;
      timerStop(timer);
      once = false;
      interrupt_down = false;
    }
  
  delay(10); // this speeds up the simulation
}