| 嵌入式系统中键盘及LED显示的接口设计 |
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| 引用本文： | 张志俊,田微.嵌入式系统中键盘及LED显示的接口设计[J].现代电子技术,2007,30(18):67-69. |
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| 作者姓名： | 张志俊 田微 |
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| 作者单位： | 中南民族大学,计算机科学学院,湖北,武汉,430074 |
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| 摘 要： | 在监控设备的电路设计中,键盘和显示需要占用MCU大量的硬、软件资源,为MCU扩展串行通信驱动芯片可以较好地解决此类问题。结合嵌入式微控制器LPC2148,采用串行键盘显示驱动芯片CH451,设计相应的接口电路和软件驱动与管理程序,可以实现8位LED显示、64位按键,中断方式快速响应外部键盘中断。电路简单、运行效率高,可用于一般工业监控设备的电路设计与应用。
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| 关 键 词： | 嵌入式 微控制器 键盘显示 串行通信 |
| 文章编号： | 1004-373X（2007）18-067-03 |
| 收稿时间： | 2007-04-21 |
| 修稿时间： | 2007年4月21日 |
Interface Design of Keyboard and LED Display in Embedded System |
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| ZHANG Zhijun,TIAN Wei.Interface Design of Keyboard and LED Display in Embedded System[J].Modern Electronic Technique,2007,30(18):67-69. |
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| Authors: | ZHANG Zhijun TIAN Wei |
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| Affiliation: | College of Computer Science, South - Central University for Nationalities,Wuhan, 430074, China |
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| Abstract: | In circuit design of controlling equipments,a great deal of hardware and software resources of MCU is occupied for the keyboard and display.In order to solve this problem,extending a serial communication drive chip to the MCU should be used.Based on an embedded microcontroller LPC2148,linked with a serial keyboard / display interface chip CH451,the interface electric circuit is designed,its drive programmer is developed.An 8 LEDs and 64 keys function could be realized.Adopting external interrupt mode could quickly respond the key pressed.This circuit is simple and high-efficiency.It can be applied to the design and application for the control equipment circuit in industry. |
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| Keywords: | embedded MCU keyboard display serial communication |
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