// Global variable to store button status
volatile int BtnStatus = 0;
SemaphoreHandle_t mutex;

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

  // Create a mutex for accessing BtnStatus
  mutex = xSemaphoreCreateMutex();

  // Set up the button and LED pins
  pinMode(18, INPUT_PULLDOWN);
  pinMode(12, OUTPUT);

  // Create tasks
  xTaskCreatePinnedToCore(TaskA, "TaskA", 1024, NULL, 2, NULL, 1);  // High priority
  xTaskCreatePinnedToCore(TaskB, "TaskB", 1024, NULL, 1, NULL, 1);  // Low priority

  Serial.println("Tasks created for TaskA and TaskB.");
}

void loop() {
  // Empty loop since tasks are running in FreeRTOS
}

// Task A: Read button status and store in BtnStatus
void TaskA(void *pvParameters) {
  while (1) {
    if (xSemaphoreTake(mutex, (TickType_t) 10) == pdTRUE) {  // Timeout every 10 ticks
      BtnStatus = digitalRead(18);
      xSemaphoreGive(mutex);
    }
    vTaskDelay(pdMS_TO_TICKS(50));  // 50 ms period
  }
}

// Task B: Control LED based on BtnStatus
void TaskB(void *pvParameters) {
  while (1) {
    if (xSemaphoreTake(mutex, portMAX_DELAY) == pdTRUE) {  // No timeout block
      if (BtnStatus == HIGH || BtnStatus > 1) {
        digitalWrite(12, HIGH);
      } else {
        digitalWrite(12, LOW);
      }
      xSemaphoreGive(mutex);
    }
    vTaskDelay(pdMS_TO_TICKS(120));  // 120 ms period
  }
}