#define LED 12
#define BUTTON 16
#define C_TIME 500000

void IRAM_ATTR trigger_led(){
   digitalWrite(LED,!digitalRead(LED));
}

hw_timer_t*My_timer = NULL;

void setup() {
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32-S2!");
  pinMode(LED,OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
  attachInterrupt(BUTTON,trigger_led,RISING);
  My_timer = timerBegin(0,80,true);

  timerAttachInterrupt(My_timer,&trigger_led,true);
  timerAlarmWrite(My_timer,C_TIME,true);
  timerAlarmEnable(My_timer);
}

void loop() {
delay(100);
}