摘要： 介绍转轴编码器的原理，从而提出面板中按键和转轴编码器的混合矩阵连接方案。它具有电路简单、I/O资源占用少、软件实现容易的特点。通过定时中断扫描、基于向量的数据处理、基于FIFO的数据存取、基于时间记录的转轴编码器识别、软件去抖以及PS/2协议的软件实现等技术手段，实现该例的PS/2接口面板，其具有低成本、性能可靠稳定、响应及时、字符可加速输出等优点，并在高端智能仪器中得到很好的应用。

关键词: 转轴编码器, 定时中断扫描, 向量, FIFO堆栈, PS/2接口

Abstract: A matrix connection of the panel using buttons and rotating shaft encoders is developed after the principle of rotating shaft encoders is introduced. This type of connection is characteristic of simplified circuit, less I/O resource exhausting, ease of soft realization. Then, with the help of efficient soft method, for example, timing-interrupt scanning, vector-based data processing, FIFO-based data accessing, time-recording-based knob recognizing, soft debounce processing and soft realizing of PS/2 protocol, a PS/2 interfaced panel is realized, which is applied in advanced intelligent instrument with the strong points of low cost, high performance, in-time responding, speed-up output.

Key words: Rotating shaft encoder, Timing-interrupt scanning, Vector, FIFO stack, PS/2 interface