键盘.c

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作者：pslyjvm  
键盘.c
本程序是4*4矩阵键盘的扫描程序
*************************************************/
#include <reg52.h>
unsigned char code table[]={0xC0,0xF9,0xA4,0xB0,  //字型码
                            0x99,0x92,0x82,0xF8,
                            0x80,0x98,0x88,0x83,
                            0xC6,0xA1,0x86,0x8E};
unsigned char temp;
unsigned char key;
unsigned char i,j;
sbit P2_0=P2^0;
sbit P1_4=P1^4;
sbit P1_5=P1^5;
sbit P1_6=P1^6;
sbit P1_7=P1^7;

void Delay(unsigned int ms)      //延迟程序
{
   int i,j;
   for(i=0;i<ms;i++)
   { 
      for(j=0;j<114;j++);
   }
}

void main(void)      //主程序
{
   while(1)
    {
   P2=0xff;
      P0=0xff;
      P1=0xff;
      P1_4=0;
      temp=P1;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
          Delay(10);
          temp=P1;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {             
              switch(temp)
                {
                  case 0x0e:
                    key=0;
                    break;
                  case 0x0d:
                    key=1;
                    break;
                  case 0x0b:
                    key=2;
                    break;
                  case 0x07:
                    key=3;
                    break;
                }
              P2_0=~P2_0;
              P0=table[key];
     temp=P1;      //等待按键被释放
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P1;
                  temp=temp & 0x0f;             
                }
            }
        }
   P2=0xff;
      P0=0xff;
      P1=0xff;
      P1_5=0;
      temp=P1;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
         Delay(10); 
          temp=P1;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {          
              switch(temp)
                {
                  case 0x0e:
                    key=4;
                    break;
                  case 0x0d:
                    key=5;
                    break;
                  case 0x0b:
                    key=6;
                    break;
                  case 0x07:
                    key=7;
                    break;
                }           
              P2_0=~P2_0;
              P0=table[key];
     temp=P1;      //等待按键释放
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P1;
                  temp=temp & 0x0f;             
                }
            }
        }
      P2=0xff;
      P0=0xff;
      P1=0xff;
      P1_6=0;
      temp=P1;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
          Delay(10);
          temp=P1;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {    
              switch(temp)
                {
                  case 0x0e:
                    key=8;
                    break;
                  case 0x0d:
                    key=9;
                    break;
                  case 0x0b:
                    key=10;
                    break;
                  case 0x07:
                    key=11;
                    break;
                }

              P2_0=~P2_0;
              P0=table[key];
              temp=P1;         //等待按键释放
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P1;
                  temp=temp & 0x0f;             
                }
            }
        }
   P2=0xff;
      P0=0xff;
      P1=0xff;
      P1_7=0;
      temp=P1;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
          Delay(10); 
          temp=P1;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {        
              switch(temp)
                {
                  case 0x0e:
                    key=12;
                    break;
                  case 0x0d:
                    key=13;
                    break;
                  case 0x0b:
                    key=14;
                    break;
                  case 0x07:
                    key=15;
                    break;
                }
              P2_0=~P2_0;
              P0=table[key];
              temp=P1;     //等待按键的释放
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P1;
                  temp=temp & 0x0f;             
                }
            }
        }
    }
}

 

 

附：原理图