基于P89LPC938微处理器的触摸屏系统设计  

Touch-screen system design based on P89LPC938 microprocessor

作　　者：李数函[1] 杨冬云[2] 

机构地区：[1]成都市技师学院电子信息工程系,四川成都610031 [2]黑龙江工程学院电子工程系,黑龙江哈尔滨150050

出　　处：《黑龙江工程学院学报》2010年第4期59-62,共4页Journal of Heilongjiang Institute of Technology

摘　　要：通过对四线电阻式触摸屏的工作原理、微处理器P89LPC938的性能进行分析,设计一种简单、高效、稳定、易用的触摸屏驱动电路。本系统设计改进现在复杂的触摸屏驱动,使得触摸屏驱动更为简单、可行。在此基础上设计整个触摸屏系统的硬件和软件。该系统的设计实现硬件电路的简单化,直接利用P89LPC938微处理器的A/D控制触摸屏,降低了成本。利用软件实现IO口的特殊功能和一般功能的相互转换来达到对触摸屏的控制。通过实验验证该系统的可行性和可靠性。Based on the four-wire resistive touch screen works,the performance of microprocessors P89LPC938 analysis,a simple,efficient,stable,easy to use touch screen driver is designed.The improved system design is complicated touch-screen driven,so the touch screen driver is more simple and feasible.On this basis,the touch screen system hardware and software is designed.The design of the system hardware circuit simplification,and the direct use of P89LPC938 microcontroller A/D control touch screen reduces the cost.The software IO port special function and general functions are used to achieve the mutual conversion of the touch screen control.Experimental results show the feasibility and reliability of the system.

关 键 词：P89LPC938微处理器 触摸屏 硬件 软件 

分 类 号：TP368.1[自动化与计算机技术—计算机系统结构]