指示灯循环控制,在编程软件的配合下，要求实现如下功能：8只发光二极管做循环点亮控制，且亮灯顺序为D1→D2→D3……D8→D7→……D2→D1，无限循环两次亮灯的时间间隔约为0.5秒。(Indicator light cycle control, with the cooperation of the programming software, requires the following functions: 8 light-emitting diodes do cycle light control, and the lighting sequence infinite The interval between two cycles of lighting is approximately 0.5 seconds.)