How to catch UART Live data in Matlab

I have built a mechanism for sending the letter 'O' every few seconds. After that I catch the recieved Data with fgets in MATLAB. fgets gives me a batch of lettters after some time which is not optimal because i want to see the arrival of each letter LIVE. Is there a way to do it in matlab?

Thanks.

while (1)
  {
      buffer[0] = 'O';
          Delay(1000);
          GPIO_PinOutSet(LED_PORT_E,15);
          Delay(1000);
                  USART_Tx(USART1,buffer[0]);
          GPIO_PinOutClear(LED_PORT_E,15);
      Delay(1000);
  }