这是一个自己以前编写的4X4键盘扫描程序设计，结合protues使用，里面的设计思想还是非常值得初学者们借鉴的，希望对大家有帮忙！-This is a previously written their own 4X4 keyboard scanner design, combined with protues use, which the design was well worth it for beginners, learn, and we hope to help!