#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit A1=P0^0;
sbit B1=P0^1;
sbit C1=P0^2;
sbit D1=P0^3;
uchar speed;
void delay_ms(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=100;j>0;j--);
}
main()
{
speed=10;
while(1)
{
A1=1;B1=0;C1=0;D1=0;
delay_ms(speed);
A1=0;B1=1;C1=0;D1=0;
delay_ms(speed);
A1=0;B1=0;C1=1;D1=0;
delay_ms(speed);
A1=0;B1=0;C1=0;D1=1;
delay_ms(speed) ; \
}
}
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