#include<reg52.h>
#include<intrins.h>
#define uint unsigned int
#define uchar unsigned char
void delayms(uint);
uchar aa,bb;
void main()
{
aa=0xfe;
bb=0x7f;
while(1)
{
P1=aa;
delayms(500);
aa=_crol_(aa, 1);
P1=bb;
delayms(500);
bb=_cror_(bb,1);
}
}
void delayms(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}
//对称式交叉流水灯
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