在TQ2440下 qtopia 实现LED 控制； 功能扩展：具有保存LED状态的功能，即关闭应用程序以后，再打开此应用程序，原来的LED灯的状态不会改变.-Under the TQ2440 qtopia realize LED control Function extension: has the function of save the LED status after that close the application, and then open the applicatio