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第一章:硬件资源模块第二章:keilc软件使用
at89s51单片机实验及实践课题     at89s51单片机实验及实践课题
1.闪烁灯2.模拟开关灯
3.多路开关状态指示4.广告灯的左移右移
5.广告灯(利用取表方式)6.报警产生器
7.I/O并行口直接驱动LED显示8.按键识别方法之一
9.一键多功能按键识别技术10.00-99计数器
11.00-59秒计时器(软件延时)12.可预置可逆4位计数器
13.动态数码显示技术14.4×4矩阵式键盘识别技术
15.定时计数器T0作定时(一)16.定时计数器T0作定时应用技术(二)
17.99秒马表设计18.“嘀、嘀、……”报警声
19.“叮咚”门铃20.数字钟(★)
21.拉幕式数码显示技术22.电子琴
23.模拟计算器数字输入及显示24.8×8LED点阵显示技术
25.点阵LED“0-9”数字显示技术26.点阵式LED简单图形显示技术
27.ADC0809A/D转换器基本应用技术28.数字电压表
29.两点间温度控制30.四位数数字温度计
31.6位数显频率计数器32.电子密码锁设计
33.4×4键盘的电子密码锁34.带有存储器功能的数字温度计-DS1624技术应用
35.DS18B20数字温度计使用

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33.    4×4键盘及8位数码管显示构成的电子密码锁

1.      实验任务

4×4组成09数字键及确认键。

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

4.33.1

3.      系统板上硬件连线

(1).            把“单片机系统”区域中的P0.0P0.78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P2.0P2.78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P3.0P3.78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:

 

 

 

 

 

 

 

 

4.33.2

 

5.      C语言源程序

#include <AT89X52.H>

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)%256;

  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<keycount;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<keycount;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<keycount;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<keycount;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)%256;

  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;

    }

}