按键驱动程序。主要功能：如果按下查询键值，消抖，发送标志位置位 如果同一个键一直处于按下状态，只发送一次；如果是两个特殊键，则一直发送。-Key drivers. Main functions: if the key press inquiries, elimination Buffeting, send mark the location of places, if the same key has been pressed, and sent only once　if there are two special keys, it has been sent.