#define LED 17
#define BUTTON 16

volatile int last_millis=0;

void IRAM_ATTR trigger_led(){
  if(millis()-last_millis > 50) //or remove bounce from button
    digitalWrite(LED,!digitalRead(LED));
  last_millis=millis();
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT);
  attachInterrupt(BUTTON, trigger_led,RISING);

}

void loop() {
  delay(10);
  //Serial.println(digitalRead(BUTTON));
}