verilog 编写的ps2键盘接口协议，FPGA接收到断码后确定通码,译码后显示到lcd1602上。说明：只是个按键，没有检测shift按键。只是译码了部分按键。-it is design by verilog language.the function is encode the keyboard and show on lcd. notice:the encode part is only encode one key. and only encode part of the keyboa