| 基于优先级编码器的非编码矩阵键盘接口设计 |
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| 引用本文： | 卜登立. 基于优先级编码器的非编码矩阵键盘接口设计[J]. 化工自动化及仪表, 2010, 37(4): 93-95 |
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| 作者姓名： | 卜登立 |
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| 作者单位： | 井冈山大学,信息科学与传媒学院,江西,吉安,343009 |
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| 摘 要： | 针对嵌入式系统硬件利用率的问题,提出一种基于优先级编码器的非编码矩阵键盘接口设计方案。该方案采用中断工作方式,并通过内部定时中断实现消抖、按键识别以及按键自动重复处理。使用74HC147进行了4×9非编码矩阵键盘的扩展,给出了硬件设计以及软件设计。这种键盘接口设计简单,提高了嵌入式处理器的效率和I/O端口的利用率。
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| 关 键 词： | 嵌入式系统 优先级编码器 键盘接口 中断 自动重复 |
Design of Non-Coding Matrix Keyboard Interface Based on Priority Encoder |
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| BU Deng-li. Design of Non-Coding Matrix Keyboard Interface Based on Priority Encoder[J]. Control and Instruments In Chemical Industry, 2010, 37(4): 93-95 |
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| Authors: | BU Deng-li |
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| Affiliation: | BU Deng-li(College of Information Science and Medium,Jinggangshan University,Ji＇an 343009,China) |
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| Abstract: | Aimed at the hardware utilization for embedded systems,the design of priority encoder-based non-coding matrix keyboard interface was proposed.The design plan employed the interrupt service,the debouncing through internal timer interrupt,the key identification and the automatic processing.When extending the 4×9 non-coding matrix keyboard,the 74HC147 was used and the hardware and software designs were given.This simple keyboard interface improves the efficiency of embedded processor and I/O port. |
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| Keywords: | embedded system priority encoder keyboard interface interrupt auto-repeat |
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