说明：  在驱动程序中设定了触摸屏所处的7个不同状态，分别用从-1到5的数字表征，这7个状态构成了一个触摸屏状态机，系统根据当前状态做出下一步的处理，如表1所示。整个软件设计根据功能可以划分为5个部分，分别是初始化、设备打开、读操作、中断处理以及I/O控制
(In the driver set the touch screen in which seven different states, respectively, from-1 to 5 the number of characterization, this seven state constitutes a touch-screen state machine, the system made in accordance with the current state of the next phase of processing, such as Table 1 below. According to the entire software design features can be divided into five parts, which are initialized, equipment to open, read operation, interrupt handling, as well as I/O control)