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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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23.    模拟计算器数字输入及显示

1.实验任务

(1.       开机时,显示“0

(2.       第一次按下时,显示“D1”;第二次按下时,显示“D1D2”;第三按下时,显示“D1D2D3”,8个全显示完毕,再按下按键下时,给出“嘀”提示音。

2.电路原理图

4.23.1

3.  系统板上硬件连线

(1.       把“单片机系统”区域中的P1.0端口用导线连接到“音频放大模块”区域中的SPK IN端口上;

(2.       把“单片机系统“区域中的P3.0P3.7端口用8芯排线连接到“4X4行列式键盘”区域中的C1C4 R1R4端口上;

(3.       把“单片机系统”区域中的P0.0P0.7端口用8芯排线连接到“动态数码显示”区域中的AH端口上;

(4.       把“单片机系统:区域中的P2.0P2.7端口用8芯排线连接到“动态数码显示”区域中的S1S8端口上;

4.相关程序设计内容

(1.       行列式键盘输入及按键功能设定;

(2.       动态数码显示;

(3.       数码显示方式处理;

5.汇编源程序

(略)

6.C语言源程序

#include <AT89X51.H>

unsigned char code dispcode[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,

0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};

unsigned char code dispbitcode[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};

unsigned char dispbuf[8]={0,16,16,16,16,16,16,16};

unsigned char dispbitcount;

unsigned char temp;

unsigned char i,j;

unsigned char key;

unsigned char keypos;

bit alarmflag;

void change(unsigned char *p,unsigned char count)

{

  while(count>0)

    {

      *(p+count)=*(p+count-1);

      count--;

    }

}

void main(void)

{

  TMOD=0x01;

  TH0=(65536-4000) / 256;

  TL0=(65536-4000) % 256;

  TR0=1;

  ET0=1;

  EA=1;

  while(1)

    {

      P3=0xff;

      P3_4=0;

      temp=P3;

      temp=temp & 0x0f;

      if (temp!=0x0f)

        {

          for(i=50;i>0;i--)

          for(j=200;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;

                }

              if ((key>=0) && (key<10))

              {

                keypos++;

                if(keypos<8)

                  {

                    change(dispbuf,keypos);

                    dispbuf[0]=key;

                  }

                  else

                    {

                      keypos=8;

                      alarmflag=1;

                    }

              }

              temp=P3;

              P1_0=~P1_0;

              temp=temp & 0x0f;             

              while(temp!=0x0f)

                {

                  temp=P3;

                  temp=temp & 0x0f;             

                }

              alarmflag=0;

            }

        }

      P3=0xff;

      P3_5=0;

      temp=P3;

      temp=temp & 0x0f;

      if (temp!=0x0f)

        {

          for(i=50;i>0;i--)

          for(j=200;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;

                }

              if ((key>=0) && (key<10))

              {

                keypos++;

                if(keypos<8)

                  {

                    change(dispbuf,keypos);

                    dispbuf[0]=key;

                  }

                  else

                    {

                      keypos=8;

                      alarmflag=1;

                    }

              }

              temp=P3;

              P1_0=~P1_0;

              temp=temp & 0x0f;             

              while(temp!=0x0f)

                {

                  temp=P3;

                  temp=temp & 0x0f;             

                }

              alarmflag=0;

            }

        }

      P3=0xff;

      P3_6=0;

      temp=P3;

      temp=temp & 0x0f;

      if (temp!=0x0f)

        {

          for(i=50;i>0;i--)

          for(j=200;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;

                }

              if ((key>=0) && (key<10))

              {

                keypos++;

                if(keypos<8)

                  {

                    change(dispbuf,keypos);

                    dispbuf[0]=key;

                  }

                  else

                    {

                      keypos=8;

                      alarmflag=1;

                    }

              }

              temp=P3;

              P1_0=~P1_0;

              temp=temp & 0x0f;             

              while(temp!=0x0f)

                {

                  temp=P3;

                  temp=temp & 0x0f;              

                }

              alarmflag=0;

            }

        }

      P3=0xff;

      P3_7=0;

      temp=P3;

      temp=temp & 0x0f;

      if (temp!=0x0f)

        {

          for(i=50;i>0;i--)

          for(j=200;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;

                }

              if ((key>=0) && (key<10))

              {

                keypos++;

                if(keypos<8)

                  {

                    change(dispbuf,keypos);

                    dispbuf[0]=key;

                  }

                  else

                    {

                      keypos=8;

                      alarmflag=1;

                    }

              }

              temp=P3;

              P1_0=~P1_0;

              temp=temp & 0x0f;             

              while(temp!=0x0f)

                {

                  temp=P3;

                  temp=temp & 0x0f;             

                }

              alarmflag=0;

            }

        }

    }

}

void t0(void) interrupt 1 using 0

{

  TH0=(65536-4000) / 256;

  TL0=(65536-4000) % 256;

  P0=dispcode[dispbuf[dispbitcount]];

  P2=dispbitcode[dispbitcount];

  dispbitcount++;

  if (dispbitcount==8)

    {

      dispbitcount=0;

    }

  if (alarmflag==1)

    {

      P1_1=~P1_1;

    }

}