C语言键盘扫描程序 通用性强 消抖连按 功能均可简单实现-scan keyboard

基于s3c2440和linux，实现了3*4的矩阵键盘驱动。 功能：延时消抖，重复按键，多键齐按-S3c2440 and based on linux, a 3* 4 matrix keyboard driver. Function: debounce delay, repeat button, multi-key together by

全功能键盘： 支持消抖、长按、组合按键、按两次、三次等-Full-function keyboard: Support debounce, long press, the combination of keys, press twice, three times, etc.