流水灯先依次点亮然后同时闪,同时灭的c语言程序

#include <reg51.h>
#define uint unsigned int
#define uchar unsigned char
uint num;
void delay(uint x)
{
uint i,j;

for(i=0;i<x;i++)

for(j=0;j<120;j++);

}
void main()
{
uchar temp;

while(1)
{
temp=0xfe;
for(num=0;num<7;num++)

{
P1=temp;
temp=temp<<1;

delay(500); //0.5s
}

for(num=0;num<8;num++)

{
P1=temp;
temp=temp>>1|0x80;
delay(500);

}

P1=0xff;
delay(500);

for(num=0;num<4;num++)

{

P1=0X00;

delay(500);

P1=0xff;

delay(500);

}

}

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