关于#51单片机#的问题：代码下载到51板子（AT89C52）后数码管只显示了左边一位

Question

如图所示，代码下载到51板子（AT89C52）后数码管只显示了左边一位。（我想显示学号后8位。）是哪里写错了呢？

#include<reg52.h>
#include<stdio.h>
#include<intrins.h>
sbit A=P2^2;
sbit B1=P2^3;
sbit C=P2^4;
sbit beep=P2^5;
unsigned char sno[]={0x3F,0x3F,0x4F,0x3F,0x3F,0x07,0x4F,0x3F};

void printsno(unsigned char location)
{
    switch(location)
    {
        case 0:C=1;B1=1;A=1;break;
        case 1:C=1;B1=1;A=0;break;
        case 2:C=1;B1=0;A=1;break;
        case 3:C=1;B1=0;A=0;break;
        case 4:C=0;B1=1;A=1;break;
        case 5:C=0;B1=1;A=0;break;
        case 6:C=0;B1=0;A=1;break;
        case 7:C=0;B1=0;A=0;break;
    }
    P0=sno[location];
    Delay1ms();        
}

void main()
{
    unsigned char i;
    beep=0;
    for(i=0;i<8;i++)
    {
        printsno(i);
    }
    while(1)
    {
    }
}

Answer 1

动态数码管必须不停刷新，静态数码管送一次即可。