说明：  P3.2:开始,按此键则灯开始流动（由上而下） ;P3.3:停止,按此键则停止流动,所有灯为暗 ;P3.4:上,按此键则灯由上向下流动 ;P3.5:下,按此键则灯由下向上流动 ;本例可用DSB-1A型单片机实验板验证 ;本例可用dpj.dll或ledkey.dll实验仿真板验证
(P3.2: start, press this key to start the light flowing (top down) ; P3.3: stop. Press this button to stop the flow. All lights are dark ; P3.4: up, press this key to make the light flow from up to down ; P3.5: press down. Press this button to make the light flow upward from the bottom ; This example can be verified by dsb-1a single chip microcomputer experimental board ; This example can be verified by DPJ. DLL or ledkey. DLL experimental simulation board)