#include <Arduino_FreeRTOS.h>

const byte ledPin = 7;
int ledDelay = 1000;
int value = 0;
bool suspended = false;
TaskHandle_t hLed;

void readSerial() {
  for (;;) {
    if (Serial.available()) {
      value = Serial.parseInt();
      if (value > 0) {
        ledDelay = value;

        if (suspended) {
          vTaskResume(hLed);
        }

      } else {
        vTaskSuspend(hLed);
        suspended = true;
      }
    }

    while (Serial.available()) {
       Serial.read();
    }
    
    vTaskDelay(100 / portTICK_PERIOD_MS);
  }
}

void lightLed() {
  for (;;) {
    digitalWrite(ledPin, HIGH);
    vTaskDelay(ledDelay / portTICK_PERIOD_MS);

    digitalWrite(ledPin, LOW);
    vTaskDelay(ledDelay / portTICK_PERIOD_MS);
  }
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.write("Write a value in the terminal to control led: ");

  pinMode(ledPin, OUTPUT);

  xTaskCreate(readSerial, "Serial Read", 100, NULL, 2, NULL);
  xTaskCreate(lightLed, "Light Led", 100, NULL, 1, &hLed);

  vTaskStartScheduler();

}

void loop() {
  // put your main code here, to run repeatedly:

}