#define buttonPin 22
#define ledPin 2

SemaphoreHandle_t xSemaLED;
TickType_t btnDeounce = 0;

void IRAM_ATTR ISR() {
  btnDeounce = xTaskGetTickCountFromISR();
  xSemaphoreGiveFromISR(xSemaLED, NULL);
}

void setup() { 
  Serial.begin(115200);

  xSemaLED = xSemaphoreCreateBinary(); 
  xTaskCreate(flashLED, "Flash LED", 1024 * 4, NULL, 1, NULL);

  pinMode(buttonPin, INPUT_PULLUP);
  attachInterrupt(buttonPin, ISR, FALLING);
}

void flashLED(void *pvParam) {
  pinMode(ledPin, OUTPUT);
  while (1) {
    xSemaphoreTake( xSemaLED, portMAX_DELAY);
    if ((xTaskGetTickCount() - btnDeounce) < 100) {
      if (buttonPin == HIGH) { // Nếu mà button bị nhấn
    digitalWrite(ledPin,HIGH); // Đèn led sáng
  } else { // ngược lại
    digitalWrite(ledPin,LOW);
  }
      vTaskDelay(1000);
    }
  }
}

void loop() {}