本例程为四键控制时钟，k1键按下后进入时钟的调整状态，k2按下时钟上 k3按下时钟下调，调好设定的时钟后按下k4时钟进入走时状态-This routine four keys to control the clock, enter the clock adjustment of status in the k1 key is pressed, the K2 Press clock K3 press the clock down, press k4 clock into go after a good tune set clock