#include
void delay(unsigned int);

void main(void){
P1=0xaa;
while(1){
P1=_crol_(P1,1);
delay(500);
}
}

void delay(unsigned int xms){
unsigned int i,j;
for(i=xms;i>0;i--)
for(j=110;j>0;j--);
}

#include

_crol_ 為循環(huán)左移函數(shù)