用单片机实现的交通灯设计

sbit S1=P3^0;

sbit S2=P3^1;

sbit S3=P3^2;

sbit S4=P3^3;

//Delay function

void Delay(uchar ms)

{

uchar j;

while(ms--)

for(j=0;j<120;j++);

}

//east and west leds control funtion

void East_West_Leds()

{

//south green leds on //让东、西的灯和南、北的灯亮时不冲突，即东、西灯亮绿灯时南、北灯亮红灯//

RED_A=1;

YELLOW_A=1;

GREEN_A=0;