MCU traffic light with interrupt

MCU traffic light source program with interrupt:

#include

#include

#define uchar unsigned char

sbit c=P1^1;

sbit d=P1^4;

uchar led[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f}; //0 to 9 digital tube display

void delay1(uchar j) //delay several ms

{ fly i;

while(j--)

{for(i=0;i<125;i++)

for(i=0;i<125;i++);}

}

void delay(uchar i) //delay 1 second

{

    unsigned char a,b,c;

                while(i--)

    {for(c=167;c>0;c--)

        for(b=171;b>0;b--)

            for(a=16;a>0;a--);

    _nop_; }

}

void nanbei(uchar a) //North-South traffic lights

{ fly j = 100;

P1=0X24;

for(a;a>0;a--)

{

while(j--)

{

P0=0XFE;

P2=led[a/10]; //display the ten-digit countdown

delay1(5); // Delay 5 milliseconds to give the machine some time to react

P0=0XFd;

P2=led[a%10]; //display countdown

delay1(5); // Delay 5 milliseconds to give the machine some time to react

if(a<=3) //If a is less than 3, the yellow light starts flashing

{

P1=0X12;               

delay1(10);

P1=0X00;

delay1(10);

}

}

}

}

void dongxi(uchar a)//East and West display traffic lights

{ fly j = 100;

P1=0X09;

for(a;a>0;a--)

{

while(j--)

{

P0=0XFB;

P2=led[a/10]; //display the ten-digit countdown

delay1(5); // Delay 5 milliseconds to give the machine some time to react

P0=0XF7;

P2=led[a%10]; //display countdown

delay1(5); // Delay 5 milliseconds to give the machine some time to react

if(a<=3) //If a is less than 3, the yellow light starts flashing

{

P1=0X12;               

delay1(10);

P1=0X00;

delay1(10);

}

}

}

}

main()

{EA=1; //Enable interrupt

EX0=1; //Enable external interrupt 0

IT0=1; //Edge trigger

while(1)

{dongxi(15); //East-west travel time 15 seconds

nanbei(30); //North-South travel time: 30 seconds

}

}

void into(void) interrupt 0 //External interrupt 0 function, used to forcibly change the direction of the traffic light

{fly i,j=1000,b;

P0=0XFF;

P1=P1&0X01; //If the last digit of P1 is 1, the east-west direction is green and the north-south direction is red

if(P1==0X01)

{P1=0X08;

for(b=0;b<3;b++)

{{for(i=0;i<10;i++)//Number of times the yellow light flashes

{delay1(100);

c=~c;

delay1(100);

}}}

P1=0Xe4;

delay(10); //The time delay after the change is 10 seconds

}

else

{P1=0X04;

for(b=0;b<3;b++)

{{for(i=0;i<10;i++)

{delay1(100);

d=~d;

delay1(100);

}}}

P1=0X09;

delay(10); //The time delay after the change is 10 seconds

}}