#include<reg51.h>


#define uint unsigned int
#define ER EAST_REDLIGHT
#define EY EAST_YELLOWLIGHT
#define EG EAST_EREENLIGHT
#define SR SOUTH_REDLIGHT
#define SY SOUTH_YELLOWLIGHT
#define SG SOUTH_EREENLIGHT


sbit ER=P1^0; 
sbit EY=P1^1;
sbit EG=P1^2;
sbit SR=P1^3;
sbit SY=P1^4;
sbit SG=P1^5;


void delay(uint k)
{
uint i,j;
for(i=0;i<1000;i++)
for(j=0;j<k;j++);
}

void int0() interrupt 0
{
ER=1;
EY=0;
EG=0;
SR=0;
SY=0;
SG=1;
}

void int1() interrupt 2
{
ER=0;
EY=0;
EG=1;
SR=1;
SY=0;
SG=0;
}


void east()
{
ER=0;
EY=0;
EG=1;
SR=1;
SY=0;
SG=0;
delay(150);
ER=0;
EY=1;
EG=0;
SR=0;
SY=1;
SG=0;
delay(85);
}

void south()
{
ER=1;
EY=0;
EG=0;
SR=0;
SY=0;
SG=1;
delay(150);
ER=0;
EY=1;
EG=0;
SR=0;
SY=1;
SG=0;
delay(85);
}


main()
{
IE=0x85;
TCON=0x00;
IP=0x04;
while(1)
{
east();
south();
}
}