#define CONFIG_FREERTOS_HZ 1000
SemaphoreHandle_t myFirstSem;

void
t1 (void *parameter)
{
  for (;;)
    {
      if (xSemaphoreTake (myFirstSem, (TickType_t) 1000) == pdTRUE)
	{
	  // yep got it
	  Serial.print ("ABCDEFGHIJKLMNOPQRST\n");
	  xSemaphoreGive (myFirstSem);
	}

    }
}

void
t2 (void *parameter)
{
  for (;;)
    {
      if (xSemaphoreTake (myFirstSem, (TickType_t) 1000) == pdTRUE)
	{
	  // yep got it
	  Serial.print ("abcdefghijklmnopqrst\n");
	  xSemaphoreGive (myFirstSem);
	}
    }
}

void
setup ()
{
  Serial.begin (112500);
  delay (3000);
  myFirstSem = xSemaphoreCreateMutex ();	// 1 key present
  // crt sem before you start tasks
  xTaskCreate (t1, "t1", 10000, NULL, 3, NULL);
  xTaskCreate (t2, "t1", 10000, NULL, 2, NULL);
  Serial.println ("just bef");
  delay (3000);

}

void
loop ()
{
  Serial.println (uxTaskPriorityGet (NULL));
  Serial.println ("loop");
  // vTaskDelay(1000 / portTICK_PERIOD_MS);
}