基于ADS7846的电阻式触摸屏接口设计  

Interface Design of Resistive Touch Screen Based on ADS7846

作　　者：王选民[1] 李明利[1] 张利川[1] 张晓博[1] 

机构地区：[1]长安大学信息工程学院,陕西西安710064

出　　处：《现代电子技术》2010年第11期88-90,共3页Modern Electronics Technique

基　　金：国家自然科学基金项目资助(60975028)

摘　　要：分析了电阻式触摸屏的结构,确定了触摸点坐标校正的方法。针对51系列单片机与触摸屏控制器ADS7846串行通信时,单片机串口方式1-3与ADS7846时序不相配,而方式0虽然与ADS7846时序相配,但输入/输出端数不相配。为此,提出了在单片机串口方式0的基础上增加双向传输GAL芯片,并据此设计了触摸屏接口电路及软件。分析和实验表明,这种接口系统能够正确获得触摸点坐标,电路简化且易于实现,实用性强。The structure of resistive touch screen is analyzed,and the revision method of touch point coordinate is determined.For serial communication of the 51 SCM and touch screen controller ADS7846,the time order of SCM serial way 1~3 and ADS7846 was unsuitable.Way 0 time order was suitable,but input/output number was different.Adding two-way chip GAL on SCM serial way 0 was proposed.On the ground,the touch screen interface circuit and software were designed.The analysis and experiment indicate that interface circuit possessed below advantages.Touch point coordinate can be obtained accurately,the circuit is realized easily,and its practicality is good.

关 键 词：电阻式触摸屏 触摸屏控制器 触摸点坐标 接口电路 串行通信 

分 类 号：TP334.2[自动化与计算机技术—计算机系统结构]