#define uint unsigned int
#define uchar unsigned char
sbit red_nb = P0^0;
sbit green_nb = P0^1;
sbit yellow_nb = P0^2;

sbit red_dx = P0^3;
sbit green_dx = P0^4;
sbit yellow_dx = P0^5;

unsigned char code Disp_Tab[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40}; //段碼控制

unsigned char code dispbit[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdF,0xbF,0x7F}; //位選控制

unsigned char LedOut[4];

uchar switch_type = 1;
uchar Traffic_time = 0;
uchar ds_time = 0;
uchar i,t;

void delay(uint i)
{
char j;
for(i; i > 0; i--)
for(j = 200; j > 0; j--);
}

void Traffic_Light() // 定義 四種狀態(tài) 顯示
{
switch(switch_type)
{
case 1:
for( i=0; i<4; i++)
{
P1 = dispbit[i]; //使用查表法進行位選
P3 = LedOut[i];

delay(100);
} //使數(shù)碼管在此 不斷的進行掃描顯示

red_nb = 0;//南北紅燈亮 綠燈滅黃燈滅
green_nb = 1;
yellow_nb = 1;

red_dx = 1;//東西紅燈滅綠燈亮 黃燈滅
green_dx = 0;
yellow_dx = 1;
if(Traffic_time != 30)
{
LedOut[0]=Disp_Tab[(35 - Traffic_time)0/10]; //數(shù)碼管顯示的數(shù)據(jù)
LedOut[1]=Disp_Tab[(35 - Traffic_time)];
LedOut[2]=Disp_Tab[(29 - Traffic_time)0/10];
LedOut[3]=Disp_Tab[(29 - Traffic_time)];
return; //返回case1
}
Traffic_time = 0;
switch_type = 2; //進入第二種狀態(tài)
break;

case 2:
for( i=0; i<4; i++)
{
P1 = dispbit[i]; //使用查表法進行位選
P3 = LedOut[i];

delay(100);
}
red_nb = 0;//南北紅燈亮 綠燈滅黃燈滅
green_nb = 1;
yellow_nb = 1;

red_dx = 1;//東西紅燈滅綠燈滅 黃燈亮
green_dx = 1;

if(Traffic_time != 6) //黃等保持的時間
{
if(Traffic_time != t)
{
t = Traffic_time;
yellow_dx = ~yellow_dx;

}
{
LedOut[0]=Disp_Tab[(5 - Traffic_time)0/10];
LedOut[1]=Disp_Tab[(5 - Traffic_time)];
LedOut[2]=Disp_Tab[(5 - Traffic_time)0/10];
LedOut[3]=Disp_Tab[(5 - Traffic_time)];
return;
}
return;
}

Traffic_time = 0;
switch_type = 3;
break;

case 3:
for( i=0; i<4; i++)
{
P1 = dispbit[i]; //使用查表法進行位選
P3 = LedOut[i];

delay(100);
}
red_nb = 1;//南北紅燈滅 綠燈亮黃燈滅
green_nb = 0;
yellow_nb = 1;

red_dx = 0;//東西紅燈亮綠燈滅 黃燈滅
green_dx = 1;
yellow_dx = 1;
if(Traffic_time != 19)
{LedOut[0]=Disp_Tab[(24 - Traffic_time)0/10];
LedOut[1]=Disp_Tab[(24 - Traffic_time)];
LedOut[2]=Disp_Tab[(18 - Traffic_time)0/10];
LedOut[3]=Disp_Tab[(18 - Traffic_time)];
return;
}
Traffic_time = 0;
switch_type = 4;
break;

case 4:
for( i=0; i<4; i++)
{
P1 = dispbit[i]; //使用查表法進行位選
P3 = LedOut[i];

delay(100);
}
red_nb = 1;//南北紅燈滅 綠燈滅黃燈亮
green_nb = 1;

red_dx = 0;//東西紅燈亮綠燈滅 黃燈滅
green_dx = 1;
yellow_dx =1;

if(Traffic_time != 6) //黃等保持的時間
{
if(Traffic_time != t)
{
t = Traffic_time;
yellow_nb = ~yellow_nb;

}
LedOut[0]=Disp_Tab[(5 - Traffic_time)0/10];
LedOut[1]=Disp_Tab[(5 - Traffic_time)];
LedOut[2]=Disp_Tab[(5 - Traffic_time)0/10];
LedOut[3]=Disp_Tab[(5 - Traffic_time)];
return;
}
Traffic_time = 0;
switch_type = 1;
break;

}
}

void main()
{
TMOD = 0x01;
TH0 = (65536 - 50000)/256;
TL0 = (65536 - 50000)%6;
EA = 1; //開總中斷
ET0 = 1; //開定時器0中斷
TR0 = 1; //啟動定時器

while(1)
{
Traffic_Light();

}

}

void T0_time() interrupt 1
{
TH0 = (65536 - 50000)/256;
TL0 = (65536 - 50000)%6;
ds_time++;
if(ds_time == 20)
{
ds_time = 0;
Traffic_time++;

}

}