怎么实现数码管全亮从0显示到9

51的单片机，数码管从0显示到9，全亮是要用while循环吗，一直循环，

//P0接7段共阳数码管
#include <reg51.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
uchar code seg[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};//不带小数点0~9
void delay(uint i)        //延时
{
    uchar t;
    while(i--)
    {
        for(t=0;t<120;t++);
    }
}
void main()
{
    while(1)
    {
        uchar i;
        P0=seg[i];
        delay(500);
        i++;
        if(seg[i]==0x90)i=0;
    }
}