51单片机数码管递增显示

硬件： STC90C51（普中科技51开发板）

连线：74HC138译码管A B C与P22 P23 P24连接，控制数码管的位选；P0与数码管连接，控制段选

 

代码如下：

#include <reg51.h>
#include <intrins.h>

 sbit HC138A = P2^2;
 sbit HC138B = P2^3;
 sbit HC138C = P2^4;
 sbit LE = P1^0;

//数码管共阴级编码
unsigned char code table1[] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
//数码管共阳级编码
unsigned char code table2[]= {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
//74HC138译码管 P2 端的设置
unsigned char code table3[] = {0x00,0x04,0x08,0x0c,0x10,0x14,0x18,0x1c};
//8个数码管各显示的数字值
unsigned char table4[8] = {0};

void delay(unsigned int num)
{
    while(num--);
}

void shuMaGuanShow(unsigned long num)
{
    table4[7] = num/10000000;
    table4[6] = num%10000000/100000;
    table4[5] = num%1000000/100000;
    table4[4] = num%100000/10000;
    
    table4[3] = num%10000/1000;
    table4[2] = num%1000/100;
    table4[1] = num%100/10;
    table4[0] = num%10;
}

void showNum(unsigned long num)
{
     int j;
     int i;
     shuMaGuanShow(num);
     for(i=8;i>0;i--)
     {
         for(j=0;j<8;j++)
         {    
                    LE = 0;
                    P0 = table2[table4[j]];
                    LE = 1;
                    P2 = table3[7-j];
                    delay(40);
         }
         LE = 0;
     }
}

// 数码管显示
int main()
{
     long num = 0;
     while(1)
     {
         showNum(num);
         num++;
     }
}