这个是针对pxa270s写的触摸屏的使用函数，还加了一个测试的程序。可以实现对触摸屏的几种操作的识别，上下划动，单击双击等。-This is written for pxa270s the use of touch-screen function, but also added a test procedure. Touch screen can be achieved on the identification of several operations, paddling up and down, double click and so on.