设计一个能显示时、分、秒的简易数字钟,具有时间调整功能，利用GW48－PK2系统上的数码管显示时间，调整时间用的按键也使用GW48－PK2系统上的按键。-can design a display, minutes and seconds of simple digital clock with the time adjustment function, use GW48 - PK2 system on the LED display, adjusted time of the keys are also used GW48 - PK2 button on the system.