PS/2键盘识别
键盘是最常用人机接口设备之一，在嵌入式系统中有着相当广泛的应用。一般自行设计的简易矩阵键盘仅仅是按行、列排列起来的矩阵开关。当需要较多的按键时，则会占用较多的I/O 端口，在软件上则要进行上电复位按键扫描及通信处理，而且还要加上按键的去抖动处理，增大了软硬件开销。而PS/2 键盘，内嵌自动去除按键抖动设计，自动地识别键的按下与释放，软硬件开发简便，价格便宜，稳定可靠，将PS/2 键盘作为嵌入式系统的输入设备已经成为可行的方案。
本设计是以现场可编程逻辑器件（FPGA）为核心的PS/2接口键盘的输入识别电路。利用QuartusⅡ软件编写verilog HDL硬件描述语言程序以实现键盘部分简单键值的识别与输出。本设计主要以程序为核心，硬件电路的搭建使用FPGA实验箱，将程序顶层文件里定义的输入输出端口与实验箱管脚进行相应的配置，除实验箱上的reset键以外，外设是一个与实验箱通过PS/2接口相连的键盘。当系统上电后，实验箱上的数码管可以依次显示从键盘上输入的键值，并具有数码管清零功能。
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foundbase :设计正用到，谢谢！2014-03-12 -
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