按键控制数码管加减程序知识分享.doc

按键控制数码管加减程序

#include <reg51.h>
#define dataport P1
#define uchar unsigned char
#define uint unsigned int
sbit latch1=P2^2; //段锁存
sbit latch2=P2^3; //位锁存
sbit key1=P3^2;
sbit key2=P3^3;
unsigned int duanma[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x7,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79};
unsigned int weima[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
unsigned char display[8];
void suocun(uchar firstbit,uchar num);

void delay(uchar z) //延时程序
{
uchar i,j,k;
for(i=0;i<50;i++)
for(j=0;j<50;j++)
for(k=0;k<z;k++);
}
void main(void)
{
uchar num=0;
key1=1;
key2=1;
while(1)
{
if(!key1)
{
delay(5);
if(!key1)
{
num++;
if(num==10)
num=0;
}
}
if(!key2)
{
delay(5);
if(!key2)
{
num--;
if(num==0)
num=9;
}
}
display[0]=duanma[num%10];
suocun(2,1);
}
}
void suocun(uchar firstbit,uchar num)
{
uchar i ;

for(i=0;i<num;i++)
{
dataport=0;
latch1=1;
latch1=0;

dataport=weima[firstbit+i];
latch2=1;
latch2=0;

dataport=display[i];
latch1=1;
latch1=0;
}
}

最近在学习51单片机，因此偶尔也会写写小程序，因此和大家分享一下，希望大家都能学好单片机。