51实现数码管动态显示数字

在学习单片机点亮数码管的时候，为实现0-9数字的依次显示

#include "reg52.h"
typedef unsigned char u8;
typedef unsigned int u16;

// #define P0 P0
sbit P22 = P2^2;
sbit P23 = P2^3;
sbit P24 = P2^4;

void delay(unsigned int ms)		//@12.000MHz
{
	unsigned char i, j;
    while (ms--)
    {
        /* code */
        i = 2;
        j = 239;
        do
        {
            while (--j);
        } while (--i);
    }
}

int toBin(unsigned char n)
{
    int binaryNumber = 0;
    int remainder, i = 1, step = 1;
 
    while (n != 0)
    {
        remainder = n % 2;
        n /= 2;
        binaryNumber += remainder * i;
        i *= 10;
    }
    return binaryNumber;
}

/**
 * 显示指定的 LED管 
 */
void showLed(unsigned char loc, unsigned char num) {
    code const int NUMBER[] = {
        0X3F, 0X06, 0X5B, 0X4F, 0X66, 0X6D, 0X7D, 0X07, 0X7F, 0X6F
    };

    // v1 = 7 - v1; // 将顺序翻转
    int b = toBin(loc);
    P24 = b / 100;
    P23 = b / 10 % 10;
    P22 = b % 10;
    P0 = NUMBER[num];
    delay(1);
    P0 = 0X00;
}

void main() {
    while (1) {
        int i;
        for (i = 0; i < 10; i++)
        {
           showLed(2, i);
           delay(1000);
            /* code */
        }
    }
}

其中NUMBER中定义的是0-9数字在单片机中二进制的表示
toBin()是将十进制数转为二进制，方便我们在调用的时候直接通过十进制数就能指定到对应的数码管

通用大部分STC89c5xx的单片机