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4×4键盘及8位数码管显示构成的电子密码锁
单片机系列实验
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1．实验任务
　　用4×4组成0－9数字键及确认键。
　　用8位数码管组成显示电路提示信息，当输入密码时，只显示“8.”，当密码位数输入完毕按下确认键时，对输入的密码与设定的密码进行比较，若密码正确，则门开，此处用LED发光二极管亮一秒钟做为提示，同时发出“叮咚”声；若密码不正确，禁止按键输入3秒，同时发出“嘀、嘀”报警声；若在3秒之内仍有按键按下，则禁止按键输入3秒被重新禁止。
2．电路原理图

　　　　　　　　　　　　　　　　　　图4.33.1
3．系统板上硬件连线
（1）.把“单片机系统”区域中的P0.0－P0.7用8芯排线连接到“动态数码显示”区域中的ABCDEFGH端子上。
（2）.把“单片机系统“区域中的P2.0－P2.7用8芯排线连接到“动态数码显示”区域中的S1S2S3S4S5S6S7S8端子上。
（3）.把“单片机系统”区域中的P3.0－P3.7用8芯排线连接到“4×4行列式键盘”区域中的R1R2R3R4C1C2C3C4端子上。
（4）.把“单片机系统”区域中的P1.0用导线连接到“八路发光二极管模块”区域中的L2端子上。
（5）.把“单片机系统”区域中的P1.7用导线连接到“音频放大模块”区域中的SPK IN端子上。
（6）.把“音频放大模块”区域中的SPK OUT接到喇叭上。
4．程序设计内容
（1）.4×4行列式键盘识别技术：有关这方面内容前面已经讨论过，这里不再重复。
（2）.8位数码显示，初始化时，显示“P　　　”，接着输入最大6位数的密码，当密码输入完后，按下确认键，进行密码比较，然后给出相应的信息。在输入密码过程中，显示器只显示“8.”。当数字输入超过6个时，给出报警信息。在密码输入过程中，若输入错误，可以利用“DEL”键删除刚才输入的错误的数字。
（3）.4×4行列式键盘的按键功能分布图如图4.33.2所示：

　　　　　　　　　图4.33.2
5．C语言源程序
#include
unsigned char ps[]={1,2,3,4,5};
unsigned char code dispbit[]={0xfe,0xfd,0xfb,0xf7,
                              0xef,0xdf,0xbf,0x7f};
unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,
                               0x6d,0x7d,0x07,0x7f,0x6f,
                               0x77,0x7c,0x39,0x5e,0x79,0x71,
                               0x00,0x40,0x73,0xff};
unsigned char dispbuf[8]={18,16,16,16,16,16,16,16};
unsigned char dispcount;
unsigned char flashcount;
unsigned char temp;
unsigned char key;
unsigned char keycount;
unsigned char pslen=5;
unsigned char getps[6];
bit keyoverflag;
bit errorflag;
bit rightflag;
unsigned int second3;
unsigned int aa,bb;
unsigned int cc;
bit okflag;
bit alarmflag;
bit hibitflag;
unsigned char oka,okb;
void main(void)
{
  unsigned char i,j;
  TMOD=0x01;
  TH0=(65536-500)/256;
  TL0=(65536-500)%6;
  TR0=1;
  ET0=1;
  EA=1;
  while(1)
    {
      P3=0xff;
      P3_4=0;
      temp=P3;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
          for(i=10;i>0;i--)
          for(j=248;j>0;j--);
          temp=P3;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {
              temp=P3;
              temp=temp & 0x0f;             
              switch(temp)
                {
                  case 0x0e:
                    key=7;
                    break;
                  case 0x0d:
                    key=8;
                    break;
                  case 0x0b:
                    key=9;
                    break;
                  case 0x07:
                    key=10;
                    break;
                }
              temp=P3;
              P1_1=~P1_1;
              if((key>=0) && (key<10))
                {
                  if(keycount<6)
                    {
                      getps[keycount]=key;
                      dispbuf[keycount+2]=19;
                    }
                  keycount++;
                  if(keycount==6)
                    {
                      keycount=6;
                    }
                    else if(keycount>6)
                      {
                        keycount=6;
                        keyoverflag=1;//key overflow                       
                      }
                }
                else if(key==12)//delete key
                  {
                    if(keycount>0)
                      {
                        keycount--;
                        getps[keycount]=0;
                        dispbuf[keycount+2]=16;
                      }
                      else
                        {
                          keyoverflag=1;
                        }
                  }
                  else if(key==15)//enter key
                    {
                      if(keycount!=pslen)
                        {
                          errorflag=1;
                          rightflag=0;
                          second3=0;
                        }
                        else
                          {
                            for(i=0;i
                              {
                                if(getps[i]!=ps[i])
                                  {
                                    i=keycount;
                                    errorflag=1;
                                    rightflag=0;
                                    second3=0;
                                    goto a;
                                  }
                              }
                            errorflag=0;
                            rightflag=1;
a:                          i=keycount;
                          }
                    }
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P3;
                  temp=temp & 0x0f;             
                }
              keyoverflag=0;//?????????
            }
        }
      P3=0xff;
      P3_5=0;
      temp=P3;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
          for(i=10;i>0;i--)
          for(j=248;j>0;j--);
          temp=P3;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {
              temp=P3;
              temp=temp & 0x0f;             
              switch(temp)
                {
                  case 0x0e:
                    key=4;
                    break;
                  case 0x0d:
                    key=5;
                    break;
                  case 0x0b:
                    key=6;
                    break;
                  case 0x07:
                    key=11;
                    break;
                }
              temp=P3;
              P1_1=~P1_1;
              if((key>=0) && (key<10))
                {
                  if(keycount<6)
                    {
                      getps[keycount]=key;
                      dispbuf[keycount+2]=19;
                    }
                  keycount++;
                  if(keycount==6)
                    {
                      keycount=6;
                    }
                    else if(keycount>6)
                      {
                        keycount=6;
                        keyoverflag=1;//key overflow                       
                      }
                }
                else if(key==12)//delete key
                  {
                    if(keycount>0)
                      {
                        keycount--;
                        getps[keycount]=0;
                        dispbuf[keycount+2]=16;
                      }
                      else
                        {
                          keyoverflag=1;
                        }
                  }
                  else if(key==15)//enter key
                    {
                      if(keycount!=pslen)
                        {
                          errorflag=1;
                          rightflag=0;
                          second3=0;
                        }
                        else
                          {
                            for(i=0;i
                              {
                                if(getps[i]!=ps[i])
                                  {
                                    i=keycount;
                                    errorflag=1;
                                    rightflag=0;
                                    second3=0;
                                    goto a4;
                                  }
                              }
                            errorflag=0;
                            rightflag=1;
a4:                          i=keycount;
                          }
                    }
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P3;
                  temp=temp & 0x0f;             
                }
              keyoverflag=0;//?????????
            }
        }
 
      P3=0xff;
      P3_6=0;
      temp=P3;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
          for(i=10;i>0;i--)
          for(j=248;j>0;j--);
          temp=P3;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {
              temp=P3;
              temp=temp & 0x0f;             
              switch(temp)
                {
                  case 0x0e:
                    key=1;
                    break;
                  case 0x0d:
                    key=2;
                    break;
                  case 0x0b:
                    key=3;
                    break;
                  case 0x07:
                    key=12;
                    break;
                }
              temp=P3;
              P1_1=~P1_1;
              if((key>=0) && (key<10))
                {
                  if(keycount<6)
                    {
                      getps[keycount]=key;
                      dispbuf[keycount+2]=19;
                    }
                  keycount++;
                  if(keycount==6)
                    {
                      keycount=6;
                    }
                    else if(keycount>6)
                      {
                        keycount=6;
                        keyoverflag=1;//key overflow                       
                      }
                }
                else if(key==12)//delete key
                  {
                    if(keycount>0)
                      {
                        keycount--;
                        getps[keycount]=0;
                        dispbuf[keycount+2]=16;
                      }
                      else
                        {
                          keyoverflag=1;
                        }
                  }
                  else if(key==15)//enter key
                    {
                      if(keycount!=pslen)
                        {
                          errorflag=1;
                          rightflag=0;
                          second3=0;
                        }
                        else
                          {
                            for(i=0;i
                              {
                                if(getps[i]!=ps[i])
                                  {
                                    i=keycount;
                                    errorflag=1;
                                    rightflag=0;
                                    second3=0;
                                    goto a3;
                                  }
                              }
                            errorflag=0;
                            rightflag=1;
a3:                          i=keycount;
                          }
                    }
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P3;
                  temp=temp & 0x0f;             
                }
              keyoverflag=0;//?????????
            }
        }
      P3=0xff;
      P3_7=0;
      temp=P3;
      temp=temp & 0x0f;
      if (temp!=0x0f)
        {
          for(i=10;i>0;i--)
          for(j=248;j>0;j--);
          temp=P3;
          temp=temp & 0x0f;
          if (temp!=0x0f)
            {
              temp=P3;
              temp=temp & 0x0f;             
              switch(temp)
                {
                  case 0x0e:
                    key=0;
                    break;
                  case 0x0d:
                    key=13;
                    break;
                  case 0x0b:
                    key=14;
                    break;
                  case 0x07:
                    key=15;
                    break;
                }
              temp=P3;
              P1_1=~P1_1;
              if((key>=0) && (key<10))
                {
                  if(keycount<6)
                    {
                      getps[keycount]=key;
                      dispbuf[keycount+2]=19;
                    }
                  keycount++;
                  if(keycount==6)
                    {
                      keycount=6;
                    }
                    else if(keycount>6)
                      {
                        keycount=6;
                        keyoverflag=1;//key overflow                       
                      }
                }
                else if(key==12)//delete key
                  {
                    if(keycount>0)
                      {
                        keycount--;
                        getps[keycount]=0;
                        dispbuf[keycount+2]=16;
                      }
                      else
                        {
                          keyoverflag=1;
                        }
                  }
                  else if(key==15)//enter key
                    {
                      if(keycount!=pslen)
                        {
                          errorflag=1;
                          rightflag=0;
                          second3=0;
                        }
                        else
                          {
                            for(i=0;i
                              {
                                if(getps[i]!=ps[i])
                                  {
                                    i=keycount;
                                    errorflag=1;
                                    rightflag=0;
                                    second3=0;
                                    goto a2;
                                  }
                              }
                            errorflag=0;
                            rightflag=1;
a2:                          i=keycount;
                          }
                    }
              temp=temp & 0x0f;             
              while(temp!=0x0f)
                {
                  temp=P3;
                  temp=temp & 0x0f;             
                }
              keyoverflag=0;//?????????
            }                         
        }
 
    }
}
void t0(void) interrupt 1 using 0
{
  TH0=(65536-500)/256;
  TL0=(65536-500)%6;
  flashcount++;
  if(flashcount==8)
    {
      flashcount=0;
      P0=dispcode[dispbuf[dispcount]];
      P2=dispbit[dispcount];
      dispcount++;
      if(dispcount==8)
        {
          dispcount=0;
        }
    }
  if((errorflag==1) && (rightflag==0))
    {
      bb++;
      if(bb==800)
        {
          bb=0;
          alarmflag=~alarmflag;
        }
      if(alarmflag==1)//sound alarm signal
        {
          P1_7=~P1_7;
        }
      aa++;
      if(aa==800)//light alarm signal
        {
          aa=0;
          P1_0=~P1_0;
        }
      second3++;
      if(second3==6400)
        {
          second3=0;
          errorflag=0;
          rightflag=0;
          alarmflag=0;
          bb=0;
          aa=0;
        }     
    }
    else if((errorflag==0) && (rightflag==1))
      {
        P1_0=0;
        cc++;
        if(cc<1000)
          {
            okflag=1;
          }
          else if(cc<2000)
            {
              okflag=0;
            }
            else
              {
                errorflag=0;
                rightflag=0;
                P1_7=1;
                cc=0;
                oka=0;
                okb=0;
                okflag=0;
                P1_0=1;
              }
        if(okflag==1)
          {
            oka++;
            if(oka==2)
              {
                oka=0;
                P1_7=~P1_7;
              }
          }
          else
            {
              okb++;
              if(okb==3)
                {
                  okb=0;
                  P1_7=~P1_7;
                }
            }
      }
  if(keyoverflag==1)
    {
      P1_7=~P1_7;
    }
}
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