2021年09月26日 | 51实验14.数码管从 000 显示到999

#include "reg52.h"

typedef unsigned int u16;   

typedef unsigned char u8;

//138译码器管脚位定义

sbit LSA=P2^2;

sbit LSB=P2^3;

sbit LSC=P2^4;

//数码表

u8 code smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,

         0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

//延时函数

void delay(u16 i)

{

while(i--);

}

void DigDisplay(u16 num)

{

u8 i;

u16 bits,ten,hundreds;

//取位

    bits=num%10;

    ten=num/10%10;

    hundreds=num/100;

//前三个数码管亮

LSA=1;LSB=1;LSC=1;

            P0=smgduan[hundreds];

delay(700);

LSA=0;LSB=1;LSC=1; 

            P0=smgduan[ten];

delay(700);

LSA=1;LSB=0;LSC=1; 

P0=smgduan[bits];

delay(700);

}

void main()

{

while(1)

{

u16 n;

//n从0到999循环

for(n=0;n<1000;n++)

{

DigDisplay(n);  

}

}

}