我这个LED循环有问题，大师们帮我看看

#include <reg52.h>
void delay1(unsigned int ms)
{
unsigned int a;
while(ms)
{
for (a=0;a<10000;a++);
ms--;
}
}
void main(void)
{
unsigned int LEDF[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned int LED,i,j;
LED=0x00;
P2=LED;

do{
for (i=0;i<8;i++)
{
delay1(10);
P2=LEDF[i];
}

for (j=7;j>=0;j--)
{
delay1(10);
P2=LEDF[j];
}

}while(1);
}

大家帮我看看，这个程序只循环一次，后面就长亮着灯，谢谢大家了