#include<reg52.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
void delay();
uchar aa;
uint num;
uchar flag;
void main()
{
aa=0xfe;
flag=0;
while(1)
{
if(flag==0)
{
P1=aa;
delay();
aa=_crol_(aa,1);
num++;
if(num>=8){flag=~flag;aa=0x7f;num=0;}
}
else
{
P1=aa;
delay();
aa=_cror_(aa,1);
num++;
if(num>=8){flag=~flag;aa=0xfe;num=0;}
}
}
}
void delay()
{
uint i,j;
for(i=500;i>0;i--)
for(j=110;j>0;j--);
}
|
