#define LED  12  // The digital pin to which a led is connected.
#define SLIDE 13
#define C_TIME  200000
volatile uint64_t pwm_value = 0;
volatile bool led_status_g;

hw_timer_t *My_timer = NULL;
void IRAM_ATTR onTimer(){
  bool led_status = digitalRead(LED);

  if (led_status && pwm_value!=C_TIME){
    digitalWrite(LED, !led_status);
    timerWrite(My_timer, pwm_value);

  }else if (!led_status && pwm_value!=0){
    digitalWrite(LED, !led_status);
    timerWrite(My_timer, C_TIME-pwm_value);

  }
  led_status_g=digitalRead(LED);

}
void setup() {
pinMode(LED, OUTPUT);
pinMode(SLIDE, INPUT);

My_timer = timerBegin(0, 80, true);
timerAttachInterrupt(My_timer, &onTimer, true);
timerAlarmWrite(My_timer, C_TIME, true);
timerAlarmEnable(My_timer); //Just Enable

  Serial.begin(115200);
  Serial.setTimeout( 10);
 // Serial.print( "Enter brightness, 0...");
 // Serial.println( C_TIME);

}
void loop() {
  //if(Serial.available() > 0)
  //{
  //    int brightness = Serial.parseInt();    // get the number
  //    Serial.read(); //Delete the new line char passed after pressing enter
  //    pwm_value = constrain( brightness, 0, C_TIME);  // set the new PWM value
  //}

  pwm_value = map(analogRead(SLIDE), 0, 4095, 0, C_TIME);
  //Serial.println( pwm_value );
  Serial.print( led_status_g );
  Serial.print("\r\n");
  

}