设计一个跑马灯控制器，能够根据外部的拨码开关进行速度控制。在速度控制的基础上，根据外部开关变换跑马灯显示方式。-Design a Marquee controller speed can be controlled according to the external DIP switches. On the basis of the speed control, according to the display mode change Marquee external switch.