工业设备中常常会由于CPU资源不足而不得不采用扩展接口芯片来满足应用系统的需要，而出现这种情况的原因之一是键盘显示占用了太多的系统资源，本功能函数是解决了工业设备键盘扫描和LED显示.-Industrial equipment is often due to lack of CPU resources to the expansion interface chip to be used to meet the needs of application systems, and the emerg