int LED = 21;
hw_timer_t *Timer0_Cfg = NULL;
void IRAM_ATTR Timer0_ISR()
{
digitalWrite(LED, !digitalRead(LED));
Serial.println(String("Timer: ")+String(millis()));
}
void setup()
{
Serial.begin(115200);
pinMode(LED, OUTPUT);
Timer0_Cfg = timerBegin(0, 80, true);
timerAttachInterrupt(Timer0_Cfg, &Timer0_ISR, true);
timerAlarmWrite(Timer0_Cfg, 100000, true);
timerAlarmEnable(Timer0_Cfg);
}
void loop()
{
vTaskDelay(portMAX_DELAY); // ejecuta tiempo de espera..
}