说明：  矩阵键盘的应用调试程序 4×4键盘扫瞄 每按一个键能通过数码管显示其位值， 稍加修改就能移值到别的程序进行使用
(Application of matrix keyboard debugger 4 × 4 keyboard scan every press of a button through digital tube display its value, will be able to shift the value slightly modified to use other procedures)