【单片机】 8个数位管，前七个显示0-6，第八个依次显示0-9

要求是数码管前七位显示0-6；第八位依次显示0-9，间隔为0.5s

#include "reg52.h"

typedef unsigned int u16;
typedef unsigned char u8;

#define SMG_A_DP_PORT    P0    

sbit LSA=P2^2;
sbit LSB=P2^3;
sbit LSC=P2^4;


u8 gsmg_code[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
                0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};


void delay_10us(u16 ten_us)
{
    while(ten_us--);    
}


void smg_display(void)
{
    u8 i=0;
    u16 j;
    u16 ms;

    for(i=0;i<7;i++)
    {
           switch(i)
        {
            case 0: LSC=1;LSB=1;LSA=1;break;
            case 1: LSC=1;LSB=1;LSA=0;break;
            case 2: LSC=1;LSB=0;LSA=1;break;
            case 3: LSC=1;LSB=0;LSA=0;break;
            case 4: LSC=0;LSB=1;LSA=1;break;
            case 5: LSC=0;LSB=1;LSA=0;break;
            case 6: LSC=0;LSB=0;LSA=1;break;
        }
            if(i==8)
        {
            SMG_A_DP_PORT=gsmg_code[j];
            ms++;
            if(ms>=100)
            {
                          j++;
              if(j>9)j=0;
              ms=0;
            }
        }
                else
        SMG_A_DP_PORT=gsmg_code[i];
        delay_10us(100);
    }
}


void main()
{    
    while(1)
    {
           smg_display();
    }        
}

请问一下哪一块出现问题了呢
详细一点哈，谢谢~

i的值到达不了8