使用四个中断的方式实现了4*4的键盘，是矩阵是键盘-Be achieved using the four interrupt 4* 4 keyboard, a keyboard matrix is

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