用89C51单片机写的一款键盘检测程序，将检测到键值通过232接口发送给主控板，主控板根据相应的要求点亮键盘上LED指示灯。-89C51 single-chip microcomputer with a keyboard to write the testing procedures, will be detected through the key 232 sent to the control board, main control board in accordance with the