一、硬件電路

電路如下，左上角是一個LCD顯示器，下面就是我們常用的單片機系統電路，當然這里的電路并非完全，現實中還要給單片機接上電源，但是仿真中完全不需要擔心哦！右上角就是波形發生電路，采用了DAC0832，下面就是個示波器，方便我們觀察仿真結果。

二、軟件程序

程序的話功能還算全面，但是如果要滿足你們的課設需求的話，還需要很多修改，需要的小伙伴不妨簡單修改下，然后再進行仿真驗證哦！還是非常方便的。

C程序：

#include < reg51.h >
#include< string.h >
#define uchar unsigned char
#define uint unsigned int
sbit RS=P3^0;
sbit RW=P3^1;
sbit EN=P3^3;
sbit K1=P2^0;
sbit K2=P2^1;
sbit K3=P2^2;
sbit K4=P2^3;
sbit K5=P2^4;
uchar WaveChoice=1;
uchar ys=30;
uchar i,a=0;
uchar sqar_num=128;
uint freq;
uchar code Sin[]={"Sine      "};
uchar code Squ[]={"Square    "} ;
uchar code Tri[]={"Triangle  "};
uchar code Saw[]={"Sawtooth  "} ;
uchar code No[]={"No Signal out "};
uchar code Wave[]={"Wave :"}; 
uchar code Fre[]={"Freq :"};
uchar code tosin[256]=
{0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,
0xae,0xb1,0xb4,0xb7,0xba,0xbc,0xbf,0xc2,0xc5,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,
0xda,0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xef,0xf1,0xf2,0xf4,
0xf5,0xf6,0xf7,0xf8,0xf9,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfd,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,
0xf4,0xf2,0xf1,0xef,0xee,0xec,0xea,0xe9,0xe7,0xe5,0xe3,0xe1,0xde,0xdd,0xda,0xd8,
0xd6,0xd4,0xd1,0xcf,0xcc,0xca,0xc7,0xc5,0xc2,0xbf,0xbc,0xba,0xb7,0xb4,0xb1,0xae,0xab,
0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x90,0x8d,0x89,0x86,0x83,0x80,
0x80,0x7c,0x79,0x76,0x72,0x6f,0x6c,0x69,0x66,0x63,0x60,0x5d,0x5a,0x57,0x55,
0x51,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,0x38,0x35,0x33,0x30,0x2e,0x2b,
0x29,0x27,0x25,0x22,0x20,0x1e,0x1c,0x1a,0x18,0x16,0x15,0x13,0x11,0x10,0x0e,
0x0d,0x0b,0x0a,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x02,0x02,0x01,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02 ,0x02,0x03,0x04,
0x05,0x06,0x07,0x08,0x09,0x0a,0x0b,0x0d,0x0e,0x10,0x11,0x13,0x15,0x16,0x18,
0x1a,0x1c,0x1e,0x20,0x22,0x25,0x27,0x29,0x2b,0x2e,0x30,0x33,0x35,0x38,0x3a,
0x3d,0x40,0x43,0x45,0x48,0x4c,0x4e ,0x51,0x55,0x57,0x5a,0x5d,0x60,0x63,0x66 ,
0x69,0x6c,0x6f,0x72,0x76,0x79,0x7c,0x80 }; 
void DelayMS(uchar ms)
{
  uchar i;
  while(ms--) for(i=0;i< 120;i++);
}
 void Delay1(uint y)
 {
   uint i;
  for(i=y;i >0;i--);
 }
uchar Busy_Check()
{
  uchar LCD_Status;
  RS=0;  //  寄存器選擇
  RW=1; //讀狀態寄存器
  EN=1;  // 開始讀
  DelayMS(1);
  LCD_Status=P1;
  EN=0;
  return  LCD_Status;


}
void Write_LCD_Command(uchar cmd)
{
     while((Busy_Check()&0x80)==0x80);   //忙等待
     RS=0;  //選擇命令寄存器
     RW=0;  //寫
     EN=0;
     P1=cmd;EN=1;DelayMS(1);EN=0;
}
void Write_LCD_Data(uchar dat)
{
   while((Busy_Check()&0x80)==0x80);   //忙等待  
    RS=1;  RW=0; EN=0; P1=dat;EN=1;DelayMS(1);EN=0;  
}
void Init_LCD()
{    
  Write_LCD_Command(0x38);
  DelayMS(1);
  Write_LCD_Command(0x01); //清屏
  DelayMS(1);
  Write_LCD_Command(0x06); //字符進入模式：屏幕不動，字符后移
  DelayMS(1);
  Write_LCD_Command(0x0C); //顯示開、關光標
  DelayMS(1);
}
void Write_freq(uint k)
{
  uchar qian,bai,shi,ge;
  qian=k/1000;
  bai=k/100%10;
  shi=k/10%10;
  ge=k%10;
  Write_LCD_Command(0x86+0x40);
  Write_LCD_Data(0x30+qian);
  Write_LCD_Data(0x30+bai);
  Write_LCD_Data(0x30+shi);
  Write_LCD_Data(0x30+ge);
  Write_LCD_Data(0x48);
  Write_LCD_Data(0x5a);
}
  void Xianshi_f()       
{
  if(WaveChoice==1)
  {
     freq=(10000000/(50000+2860*ys));
   Write_freq(freq);
  }
  if(WaveChoice==2)
  {
     freq=(10000000/(50000+2300*ys));
   Write_freq(freq);
  }
   if(WaveChoice==3)
  {
     freq=(10000000/(14000+2300*ys));
   Write_freq(freq);
  }
    if(WaveChoice==4)
  {
     freq=(10000000/(15000+2300*ys));
   Write_freq(freq);
  }
}
void Write_wave(uchar  t )
{
  switch(t)
  {
    case 0:
         Write_LCD_Command(0x86);
           DelayMS(5);
            for (i=0;i< sizeof(No)-1;i++)
          {
            Write_LCD_Data(No[i]);
            DelayMS(5);
          }
          break;
    case 1:
        ys=25;
        Write_LCD_Command(0x86);
           DelayMS(5);
            for (i=0;i< sizeof(Sin)-1;i++)
          {
            Write_LCD_Data(Sin[i]);
            DelayMS(5);
          }
        break;
    case 2:
        ys=30;
        Write_LCD_Command(0x86);
           DelayMS(5);
            for (i=0;i< sizeof(Squ)-1;i++)
          {
            Write_LCD_Data(Squ[i]);
            DelayMS(5);
           }

        break;
    case 3:
        ys=30;
        Write_LCD_Command(0x86);
           DelayMS(5);
            for (i=0;i< sizeof(Tri)-1;i++)
          {
            Write_LCD_Data(Tri[i]);
            DelayMS(5);
          }
        break;
    case 4:
        ys=30;
           Write_LCD_Command(0x86);//液晶顯示位置
           DelayMS(5);
            for (i=0;i< sizeof(Saw)-1;i++)
          {
            Write_LCD_Data(Saw[i]);
            DelayMS(5);
           }
        break;
  }
}
void Out_Wave(uchar i)
{   uchar j;  
  switch(i)
  {
    case 0:  P0=0x00;break;
    case 1:
        for (j=0;j< 255;j++)
        {
          P0=tosin[j];
          Delay1(ys);
        } 
         break;
    case 2:
            {
          if(a< sqar_num)
            {
              P0=0xff;
              Delay1(ys);
            }
          else  
            {
              P0=0x00;
              Delay1(ys);
            }
            a++;
        }  break;
    case 3:
        {
          if(a< 128)
            {
              P0=a;
              Delay1(ys);
            }
          else  
            {
              P0=255-a;
              Delay1(ys);
            }
            a++;
        }   break;
    case 4:
        {
           if(a< 255)
          {
            P0=a;
            Delay1(ys);
          }

        a++;
      if(a==255)
        {
          a=0;
        }   break;
    }
  }
}
void keyscanf()
{  
  if(K2==0)
  {
    DelayMS(5);
    if(K2==0)
    {
      while(!K2);
      ys--;
      if(ys==0)
      ys=20;
    }
  }
  if(K3==0)
  {
    DelayMS(5);
    if(K3==0)
    {
      while(!K3);
      ys++;
      if(ys >22)
      ys=20;
    }
  }
  if(K4==0)
  {
    DelayMS(5);
    if(K4==0)
    {
      while(!K4);
      if(WaveChoice==2)
      sqar_num=sqar_num+2;
      if(sqar_num==238)
        sqar_num=128;
    }
  }
  if(K5==0)
  {
    DelayMS(5);
    if(K5==0)
    {
      while(!K5);
      if(WaveChoice==2)
      sqar_num=sqar_num-2;
      if(sqar_num==18)
        sqar_num=128;      
    }
  }
} 
void main()
{
  Init_LCD();
  IE=0X81;
  IT0=1;
  Write_LCD_Command(0x80);//--顯示wave:
     DelayMS(5);     
   for (i=0;i< sizeof(Wave)-1;i++)
    {
      Write_LCD_Data(Wave[i]);
      DelayMS(5);
    }
      Write_LCD_Command(0x80+0X40);//----顯示freq:
     DelayMS(5);
    for (i=0;i< sizeof(Fre)-1;i++)
    {
      Write_LCD_Data(Fre[i]);
      DelayMS(5);
    }
     Write_wave(WaveChoice);
  while (1)
  {
       keyscanf();
    Out_Wave(WaveChoice);
    if(!(K1&K2&K3))
        Xianshi_f();
  }    
}
void EX_INT0() interrupt 0
{
    WaveChoice++;
    if(WaveChoice==5) WaveChoice=1;
    Write_wave(WaveChoice);
}

三、仿真展示

程序很簡單，小伙伴們可以根據需要自己修改程序，然后進行驗證哦！