mega16读取PS2键盘编码，并且解码以后通过UART发送到串口显示。直接发送不存在按键缓冲的问题D7口接蜂鸣器用于标记有按键按下 -mega16 read PS2 keyboard encoding and decoding through the UART later sent to the serial display. Direct Send button does not exist the problem of buffer D7 I then have to tag buz