51单片机控制交通灯_基于51单片机交通灯

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#include

#define uchar unsigned char #define uint unsigned int

sbit dula=P2^6;sbit wela=P2^7;sbit beep=P2^3;

unsigned int pp;unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};uchar j,k,l=255;uchar a1,a0;uchar shijian,deng=2;void delay(unsigned int i)//延时函数 {

for(j=i;j>0;j--)

for(k=125;k>0;k--);}

void display(unsigned char sh_c,unsigned char g_c){

dula=0;

P0=table[sh_c];

dula=1;

dula=0;

wela=0;

P0=0xfe;

wela=1;

wela=0;

delay(5);

P0=table[g_c];

dula=1;

dula=0;

P0=0xfd;

wela=1;

wela=0;

delay(5);} void main(){ TMOD=0x01;TR0=1;TH0=(65536-46080)/256;TL0=(65536-46080)%256;ET0=1;EA=1;while(1){

if(shijian==0)

{

switch(deng)

{

case 0: shijian=50;

deng=1;

break;

case 1: shijian=15;

deng=2;

break;

case 2: shijian=50;

deng=3;

break;

case 3: shijian=15;

deng=0;

break;

}

}

if(pp==20)

{ pp=0;

shijian--;

}

a0=shijian%10;

a1=shijian/10;

display(a1,a0);

switch(deng)

{

case 1: P1=0X00;

break;

case 2:

//黄灯

if(shijian%2==0)

P1=0x00;

if(shijian%2==1)

P1=0xff;

//红灯 //黄灯 //绿灯 //黄灯//红灯

break;

case 3:

//绿灯

if(shijian%2==0)

P1=0x55;

if(shijian%2==1)

P1=0xaa;

break;

case 0: if(shijian%2==0)

//黄灯

P1=0x00;

if(shijian%2==1)

P1=0xff;

break;

} } }

void time0()interrupt 1 { TH0=(65536-46080)/256;TL0=(65536-46080)%256;pp++;}