在分析液晶触摸屏的工作原理基础上,分析触摸屏专用控制器ADS7846的工作原理与控制方式.通过ADS7846与MCU的SPI接口,给出AT89S51的测量子程序流程图,提出触摸屏触点坐标的获得方法与液晶屏显示实现同步的算法,以提高设计触摸屏与液晶屏的效率,满足控制精度.
On the basis of analyzing the principle of embedded touch panel system, the working principle and control method of dedicated controller ADS7846 Touch Screen were analyzed.By the SPI interface between ADS7846 and MCU, AT89S51 measurement subroutine flowchart was given. The method of obtaining coordiates of touch-screen and the LCD screen display synchronization algorithms were proposed to improve the efficiency of touch-screen and LCD screen, and to suffice the control precision.
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