矩阵按键单个触发的压缩代码

#include "REG52.H"
#define const_voice_short 40
#define const_key_time 20

void initial_myself();
void initial_peripheral();
void delay_long(unsigned int uiDelayLong);
void T0_time();
void key_service();
void key_scan();

sbit key_sr1=P0^1;
sbit key_sr2=P0^2;
sbit key_sr3=P0^3;

sbit key_dr1=P0^4;
sbit key_dr2=P0^5;
sbit key_dr3=P0^6;
sbit key_dr4=P0^7;

sbit beep_dr=P1^5;

unsigned char ucKeyStep=1;

unsigned char ucKeySec=0;
unsigned int uiKeyTimeCnt=0;
unsigned char ucKeyLock=0;
unsigned char ucListRecord=1; //记录当前扫描到了第几列
unsigned int uiVoiceCnt=0;

void main()
{
 initial_myself();
 delay_long(100);
 initial_peripheral();
 while(1)
 {
  key_service();
 }
}

void key_scan()
{
 /*
  矩阵按键扫描的详细过程：
  先输出某一列低电平，其它三列输出高电平，这个时候再分别判断输入的三行，
  如果发现哪一行是低电平，就说明对应的按键触发。依次分别输出另外三列中
  的某一列为低电平，在分别判断输入的三行，就可以检测完12个按键。
 */
 switch(ucKeyStep)
 {
  case 1: //按键输出低ucListRecord列低电平
   if(ucListRecord==1) //第一列低电平
   {
    key_dr1=0;
    key_dr2=1;
    key_dr3=1;
    key_dr4=1;
   }
   
   else if(ucListRecord==2) //第二列低电平
   {
    key_dr1=1;
    key_dr2=0;
    key_dr3=1;
    key_dr4=1;
   }
   
   else if(ucListRecord==3) //第三列低电平
   {
    key_dr1=1;
    key_dr2=1;
    key_dr3=0;
    key_dr4=1;
   }
   
   else if(ucListRecord==4) //第四列低电平
   {
    key_dr1=1;
    key_dr2=1;
    key_dr3=1;
    key_dr4=0;
   }
   
   uiKeyTimeCnt=0;  //延时计数器清零
   ucKeyStep++;  //切换到下一运行步骤
   break;
   
  case 2:
   uiKeyTimeCnt++;
   if(uiKeyTimeCnt>1)
   {
    uiKeyTimeCnt=0;
    ucKeyStep++;
   }
   break;
   
  case 3:
   if(key_sr1==1&&key_sr2==1&&key_sr3==1)
   {
    ucKeyStep=1; //如果没有按键按下，返回到第一个运行步骤重新开始扫描
    ucKeyLock=0;
    uiKeyTimeCnt=0;
    
    ucListRecord++; //输出到下一列
    if(ucListRecord>4)
    {
     ucListRecord=1;  //依次输出完四列后，继续从第一列开始输出低电平
    }
   }
   else if(ucKeyLock==0)
   {
    if(key_sr1==0&&key_sr2==1&&key_sr3==1)
    {
     uiKeyTimeCnt++;
     if(uiKeyTimeCnt>const_key_time)
     {
      uiKeyTimeCnt=0;
      ucKeyLock=1;
      
      if(ucListRecord==1)
      {
       ucKeySec=1;
      }
      else if (ucListRecord==2)
      {
       ucKeySec=2;
      }
      else if (ucListRecord==3)
      {
       ucKeySec=3;
      }
      else
      {
       ucKeySec=4;
      }
     }
    }
   
    else if(key_sr1==1&&key_sr2==0&&key_sr3==1)
    {
     uiKeyTimeCnt++;
     if(uiKeyTimeCnt>const_key_time)
     {
      uiKeyTimeCnt=0;
      ucKeyLock=1;
      
      if(ucListRecord==1)
      {
       ucKeySec=5;
      }
      else if (ucListRecord==2)
      {
       ucKeySec=6;
      }
      else if (ucListRecord==3)
      {
       ucKeySec=7;
      }
      else
      {
       ucKeySec=8;
      }
     }
    }
    
    else if(key_sr1==1&&key_sr2==1&&key_sr3==0)
    {
     uiKeyTimeCnt++;
     if(uiKeyTimeCnt>const_key_time)
     {
      uiKeyTimeCnt=0;
      ucKeyLock=1;
      
      if(ucListRecord==1)
      {
       ucKeySec=9;
      }
      else if (ucListRecord==2)
      {
       ucKeySec=10;
      }
      else if (ucListRecord==3)
      {
       ucKeySec=11;
      }
      else
      {
       ucKeySec=12;
      }
     }
    } 
   break; 
  }
 }
}

void key_service() //第三区，按键服务应用程序
{
 switch(ucKeySec)
 {
  case 1:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;
   
  case 2:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 3:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 4:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 5:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 6:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 7:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 8:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 9:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 10:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break; 
   
  case 11:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break;

  case 12:
   uiVoiceCnt=const_voice_short;
   ucKeySec=0;
   break; 
 }
}

void T0_time() interrupt 1
{
 TF0=0;
 TR0=0;
 
 key_scan();
 
 if(uiVoiceCnt!=0)
 {
  uiVoiceCnt--;
  beep_dr=0;
 }
 else
 {
  ;
  beep_dr=1;
 }
 
 TH0=0xf8;
 TL0=0x2f;
 TR0=1;
}

void delay_long(unsigned int uiDelayLong)
{
 unsigned int i;
 unsigned int j;
 for(i=0;i<uiDelayLong;i++)
  for(j=0;j<500;j++)
   ;
}

void initial_myself()
{
 beep_dr=1;
 TMOD=0x01;
 TH0=0xf8;
 TL0=0x2f;
}

void initial_peripheral()
{
 EA=1;
 ET0=1;
 TR0=1;
}