按键驱动程序（混杂设备模型） 软件去抖动的原理就是： 定时器延时时刻到的时刻，按键的状态 要和在 定时器 启动 时刻按键的状态一致。-Key driver (hybrid device model) Jitter is the principle of the software to: State timer delay time to time, the keys To start the timer and the key moments in a consisten