原创 3×3矩阵键盘，分别让按键控制LED显示0～8

#include<reg52.h>

sbit   led1=P2^0;

sbit   led2=P2^1;

sbit   led3=P2^2;

sbit   led4=P2^3;

void  delayms(unsigned   int    x);

void  matrixkeycan();

void  display(unsigned     char num);

unsigned   char code       table[]={

0xc0,0xf9,0xa4,0xb0,0x99,0x92,

0x82,0xf8,0x80,0x90,0x88,0x83,

0xc6,0xa1,0x86,0x8e,0x00

};//共阳级数码管字符表

void  main()

{

led1=0;

led2=0;

led3=0;

led4=0;//打开4个数码管

while(1)

{

        matrixkeycan();

}

}

void  delayms(unsigned   int    x)//延时程序

{

unsigned  i,j;

for(i=x;i>0;i--)

        for(j=110;j>0;j--);

}

void  display(unsigned     char num)

{

P0=table[num];

}//显示程序

void  matrixkeycan()      

{

unsigned  char temp,key;

P1=0x3e;//确定行,111110,使行低电平

temp=P1;

temp=temp&0x38;//与111000与运算，如果按键按下，111000会变化，否则不变

if(temp!=0x38)

{

        delayms(10);//去抖动

        temp=P1;

        temp=temp&0x38;

        if(temp!=0x38)//按键按下

        {

               temp=P1;

               switch(temp)

               {

                      case 0x1e:

                                    key=0;

                                    break;

                      case 0x2e:

                                    key=1;

                                    break;

                      case 0x36:

                                    key=2;

                                    break;//分别确定3列

               }

               while(temp!=0x38)

                                    {

                                           temp=P1;

                                           temp=temp&0x38;

                                    }

        }

               display(key);

}

P1=0x3d;

temp=P1;

temp=temp&0x38;

if(temp!=0x38)

{

        temp=P1;

        switch(temp)

        {

               case 0x1d:

                             key=3;

                             break;

               case 0x2d:

                             key=4;

                             break;

               case 0x35:

                             key=5;

                             break;

        }

        while(temp!=0x38)

        {

               temp=P1;

               temp=temp&0x38;

        }

        display(key);

}

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

P1=0x3b;

temp=P1;

temp=temp&0x38;

if(temp!=0x38)

{

        delayms(10);

        temp=P1;

        temp=temp&0x38;

        if(temp!=0x38)

        {

               temp=P1;

               switch(temp)

               {

               case 0x33:

                             key=8;

                             break;

               case 0x2b:

                             key=7;

                             break;

               case 0x1b:

                             key=6;

                             break;

               }

        }

        while(temp!=0x38)

        {

               temp=P1;

               temp=temp&0x38;

        }

       display(key);

}