基于51单片机的波形发生器proteus仿真数码管LCD12864显示

仿真图1简介：

本系统采用51单片机作为系统的MCU（具体型号见下图），该系统显示器为四位数码管，可实时显示波形的参数情况
可显示四种波形，分别是方波、正弦波、三角波、锯齿波。
该设计具有电压表功能，可显示当前所测电压参数，其中ADC芯片采用的是PCF8591
该设计不支持调节波形的占空比
波形输出通过仿真软件的示波器可以查看得到
系统设计有一个功能按键作为波形切换功能。

#include 
#include 
#include 

sbit KEY = P3^7;

unsigned char code sin_num[]={
0,0,0,0,0,0,0,0,1,1,1,1,1,2,2,2,
2,3,3,4,4,4,5,5,6,6,7,7,8,8,9,9,
10,10,11,12,12,13,14,15,15,16,17,18,18,19,20,21,
22,23,24,25,25,26,27,28,29,30,31,32,34,35,36,37,
38,39,40,41,42,44,45,46,47,49,50,51,52,54,55,56,
57,59,60,61,63,64,66,67,68,70,71,73,74,75,77,78,
80,81,83,84,86,87,89,90,92,93,95,96,98,99,101,102,
104,106,107,109,110,112, 113,115,116,118,120,121,123,124,126,128,
129,131, 132,134,135, 137, 139,140,142,143,145,146,148, 149,151,153,
154,156,157,159,160,162,163,165, 166,168,169,171,172,174,175,177,
178,180,181, 182,184,185,187,188,189,191,192,194,195,196,198,199,
200,201,203,204,205,206,208,209,210,211,213,214,215,216,217,218,
219,220,221,223,224,225,226,227,228,229,230,230,231,232,233,234,
235,236,237,237,238,239,240,240,241,242,243,243,244,245,245,246,
246,247,247,248,248,249,249,250,250,251,251, 251,252,252,253,253,
253,253,254,254,254,254,254,255,255,255,255, 255,255,255,255,255
}; //这是正弦波上升半周期的采样

uchar Recv_Buffer;//数据接收缓冲
uchar Voltage[]="0.000V  ";//数据分解为电压x.xx
float Vol_Am;								//放大后的电压值
uchar key_ms;
uchar mode;

void delay(unsigned int x)//延时
{
	while(--x);
}

void key_pro()
{
	if(KEY == 0)	key_ms++;
	if(key_ms	>= 5)
	{
		if(KEY == 0)
		{
			key_ms = 0;
			mode++;
			if(mode >= 5)	mode = 0;
			while(!KEY);
		}
	}
}

void DAC_Wave()
{
	int i;
	switch(mode)
  {
   case 1: //三角波
			for(i=0;i<255;i++)
			{
				DAC_PCF(i);
				key_pro();
			}
			for(i=255;i>0;i--)
			{
				DAC_PCF(i);
				key_pro();
			}
			break;
			
	  case 2://方波
			DAC_PCF(0);
			delay(2500);
			DAC_PCF(0xff);
			delay(2500);
			break;
		
	  case 3://三角波
			for(i=255;i>0;i--)
			{
					DAC_PCF(i);
					key_pro();
			}
			break;
		
	  case 4: //正弦波 采用数组采样值 波形更好
			for(i=0;i<255;i++)
			{
				DAC_PCF(sin_num[i]);
				key_pro();
			}
			for(i=255;i>=0;i--)
			{
				DAC_PCF(sin_num[i]);
				key_pro();
			}
			break;
	  default : DAC_PCF(0x00);//否则为0 防错
	}
}

// 转换模数转换后得到的值
void Convert_To_Voltage(uchar val)
{
	Vol_Am = val;
	Vol_Am = Vol_Am*5/255*1000;
	Voltage[4]=(uint)Vol_Am%10+'0';
	Voltage[3]=(uint)Vol_Am/10%10+'0';
	Voltage[2]=(uint)Vol_Am/100%10+'0';
	Voltage[0]=(uint)Vol_Am/1000%10+'0';
}

void dis_pro()
{
	if(mode == 0)
	{
		ISendByte(0x00);
		Recv_Buffer=IRcvByte(); 
		Convert_To_Voltage(Recv_Buffer);
		seg_display((uint)Vol_Am);
	}
	else
	{
		seg_display_One(mode);
		DAC_Wave();
	}
}

void main()
{
	while(1)
	{
		key_pro();
		dis_pro();
	}
}

仿真图2简介：

本系统采用51单片机作为系统的MCU（具体型号见下图），该系统显示器为两个两位数码管，分别显示波形频率和幅度
可显示三种波形，分别是方波、正弦波、三角波。
该设计不支持调节波形的占空比
波形输出通过仿真软件的示波器可以查看得到
系统设计有七个功能按键，其中三个分别是波形选择按键，另外四个按键分别功能是频率加减和幅度加减。
波形发生器的核心芯片是利用DAC0832产生+运放LM358经过放大之后输出

#include
#include 
#define uchar unsigned char
#define uint unsigned int
uchar code tab1[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
uchar code tab2[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};	//  带小数点的0-9

uchar ds[]={135,145,158,167,176,188,199,209,218,226,234,240,245,249,252,254,254,253,251,247,243,237,230,222,213,204,193,182,170,158,
146,133,121,108,96,84,72,61,50,41,32,24,17,11,7,3,1,0,0,2,5,9,14,20,28,36,45,55,66,78,90,102,114,128};
uchar code sin_param[64]={135,145,158,167,176,188,199,209,218,226,234,240,245,249,252,254,254,253,251,247,243,237,230,222,213,204,193,182,170,158,
146,133,121,108,96,84,72,61,50,41,32,24,17,11,7,3,1,0,0,2,5,9,14,20,28,36,45,55,66,78,90,102,114,128};

uchar code Triangle[64]={0,8,16,24,32,40,48,56,64,72,80,88,96,104,112,120,128,136,144,152,160,168,176,184,192,200,208,216,224,232,240,248,
248,240,232,224,216,208,200,192,184,176,168,160,152,144,136,128,120,112,104,96,88,80,72,64,56,48,40,32,24,16,8,0};

uchar flag=1,time=0,sum=0,timer=0;
unsigned long frequency=10,volt=50,chuzhi=20000;
double acc=1;
uint  SH=0xff,SL=0x38,SQH=0xb1,SQL=0xe0;
sbit key1=P2^0;
sbit key2=P2^1;
sbit key3=P2^2;  //  三种波按钮
sbit key4=P2^3;	 //  频率-
sbit key5=P2^4;	 //  频率+
sbit key6=P2^5;	 //  幅值+
sbit key7=P2^6;	 //  幅值-
sbit fsw=P3^4;
sbit fgw=P3^5;
sbit vgw=P3^6;
sbit vxw=P3^7;


 void delay()
{
  uchar i;
  for(i=0;i<125;i++)
  ;
}


void init_ST()
{
  uint schuzhi;
  schuzhi=(15625/frequency);
  SH=(65536-schuzhi)/256;
  SL=(65536-schuzhi)%256;
  
}
void init_Sq()
{
  if(frequency>=8)
    chuzhi=500000/frequency;
  else
    chuzhi=50000/frequency;
  SQH=(65536-chuzhi)/256;
  SQL=(65536-chuzhi)%256;

}



void display()
{
  fsw=0;
  P0=tab1[frequency/10];
  delay();
  P0=0x00;
  fsw=1;
  fgw=0;
  P0=tab1[frequency%10];
  delay();
  P0=0x00;
  fgw=1;
  vgw=0;
  P0=tab2[volt/10];
  delay();
  P0=0x00;
  vgw=1;
  vxw=0;
  P0=tab1[volt%10];
  delay();
  P0=0x00;
  vxw=1;
 
}


 






void main()
{
  TMOD=0X11;
  EA=1;
  IT0=1;
  ET0=1;
  ET1=1;
  EX0=1;
  TH0=0xff;
  TL0=0x38;  //200us
  TH1=(65536-20000)/256;
  TL1=(65536-20000)%256;
  TR0=1; 
  while(1)
  {
   

  	display();
    
  }
}

void  zhongduan0() interrupt 1
{ 
  TH0=SH;
  TL0=SL;
  time++;
  if(time==64)
    time=0;
  if(flag==1)
  {
	sum=ds[time];
	P1=sum;
    
  }
  if(flag==2)
  {
	sum=ds[time];
	P1=sum;
    
  }
  
  if(flag==3)
  {
	TR0=0;
	TR1=1; 
  }
  
}

void zhongduan1() interrupt 3
{
  
  TH1=SQH;
  TL1=SQL;
  timer++;
  if(flag==3)
  {	
    if(frequency>=8)
	{ 
      sum=0xff*acc;
      if(timer%2==0)
        P1=0x00;
      else
        P1=sum;
    }
	else
	{
	  sum=0xff*acc;
	  if((timer/10)%2==0)
	    P1=0x00;
	  else
	    P1=sum;
	  
	}
	

  }
  if(flag==1||flag==2)
  {
    TR1=0;
	TR0=1;
  }
  if(timer==100)
    timer=0;
	     
	   
    
}
    
   
  

  


void keyscanFV() interrupt 0
{
  uchar i;
  EX0=0;
  delay();
  if(key1==0)
  {
      flag=1;
	  for(i=0;i<64;i++)
	    ds[i]=sin_param[i];
  }
  if(key2==0)
  {
      flag=2;
	  for(i=0;i<64;i++)
	    ds[i]= Triangle[i];
  }

  if(key3==0)
      flag=3;
 

  if (key4==0)
  {
    if(frequency<99)
	{
      frequency++;
	  init_ST();
	  init_Sq();
	}
  }
  else if(key5==0)
  { 
    if(frequency>0)
	{
      frequency--;
	  init_ST();
	  init_Sq();
	}
  }  

仿真图3简介：

本系统采用C51单片机作为系统的MCU，该系统显示器为LCD12864，可实时显示波形的参数情况
可显示四种波形，分别是正弦波 三角波方波锯齿波，且它们的频率范围均是0-400HZ
该设计不支持调节波形的占空比
波形输出通过仿真软件的示波器可以查看得到
波形发生器的核心芯片是利用DAC0832产生+运放UA741经过放大之后输出，可以通过电位器手动调节波形的幅度大小
系统设计有两个功能按键分别是切换波形和频率调节等功能。

#include 
#include 
#include 
#include 

#define DAC_OUT	P2

sbit change_wave=P3^2;               //改变波形按键
sbit change_rate=P3^3;               //改变频率按键
uchar mode=0,rate=0,delay_time=0,k,p; //为波形发生模块提供中间变量
uchar *which_wave,*which_wave2;                    
uint rate_num;

uchar code Sine_wave[64]=                                    //DA输出对应电压值对应的数字量，正弦波
{
    128,114,102,90,78,66,55,45,36,28,20,14,9,5,2,1,1,1,
    3,7,11,17,24,32,41,50,61,72,84,96,108,121,133,146,
    158,170,182,193,204,213,222,230,237,243,247,251,253,
    254,254,252,249,245,240,234,226,218,209,199,188,176,
    167,158,145,135
};

uchar code Sawtooth_Wave[64]=                                //锯齿波
{
    255,251,247,243,239,235,231,227,223,219,215,210,206,202,
    198,194,190,186,182,178,174,170,166,162,158,154,150,146,
    142,138,134,130,125,121,117,113,109,105,101,97,93,89,85,
    81,77,73,69,61,57,53,49,45,40,36,32,28,24,20,16,12,8,4,0
};

uchar code Square_wave[64]=                                  //方波
{
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    0,0,0,0,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,255,255,255,255,255,255,255,255,
    255,255,255,255,255,255,
};

uchar code Triangular_Wave[64]=                              //三角波
{
    0,8,16,24,32,40,48,56,64,72,80,88,96,104,112,120,128,136,
    144,152,160,168,176,184,192,200,208,216,224,232,240,248,
    248,240,232,224,216,208,200,192,184,176,168,160,152,144,
    136,128,120,112,104,96,88,80,72,64,56,48,40,32,24,16,8,0
};

void wave_delay()                         //波形延时函数
{
    int a,b;
    for(a=1; a>0; a--)
        for(b=122; b>0; b--);
}

void wave_init()             //波形发生模块的初始化（外部中断0、1）
{
    EA=1;
    IT0=1;             //下降沿触发
    EX0=1;
    IT1=1;
    EX1=1;
}

void disp_wave(uchar *wave)   //显示波形函数
{
    uchar page,i;
    uint date;
    select(1);								//选择左屏
    for(i=32; i<64; i++)
    {
        page=7-(wave[i]/4)/8;
        date=7-(wave[i]/4)%8;
        date=pow(2,date);
        setpos(page,i);				//选择行列
        lcd_wdat(date);
    }
    select(2);								//选择右屏
    for(i=0; i<64; i++)
    {
        page=7-(wave[i]/4)/8;
        date=7-(wave[i]/4)%8;
        date=pow(2,date);
        setpos(page,i);				//选择行列
        lcd_wdat(date);
    }
}

void main()
{

    lcd_init();
    clr_screen();
    which_wave=&Sine_wave[0];
    disp_chinese();
    disp_function(chinese_sine);
    disp_rate(400);
    disp_xy();
    disp_wave(which_wave);
    wave_init();
    while(1)
    {
        delay_time=rate;            //rate=0时，12mhz下，为400hz的波形。循环一次的时间为0.00025ms
        DAC_OUT=*(which_wave+k);
        k++;
        if(k==64)
            k=0;
        while(delay_time)
            delay_time--;
    }
}

void int0() interrupt 0    //波形选择中断服务程序
{
    EX0=0;
    wave_delay();
    mode++;
    if(mode==4)
        mode=0;
    switch(mode)
    {
    case 0 :																				//显示正弦波
        which_wave=&Sine_wave[0];
        which_wave2=&chinese_sine[0];
        break;
    case 1 :																				//显示三角波
        which_wave=&Triangular_Wave[0];
        which_wave2=&chinese_triangular[0];
        break;
    case 2 :																				//显示方波
        which_wave=&Square_wave[0];
        which_wave2=&chinese_square[0];
        break;
    case 3 :																				//显示锯齿波
        which_wave=&Sawtooth_Wave[0];
        which_wave2=&chinese_sawtooth[0];
        break;
    }
    wave_delay();
    clr_screen();																		
    disp_chinese();																
    disp_rate(400/rate);
    disp_function(which_wave2);
    disp_xy();
    disp_wave(which_wave);
    while(!change_wave);
    EX0=1;
}

void int1() interrupt 2       //频率选择
{
    EX1=0;
    wave_delay();
    p++;
    if(p==50)
        p=0;
    rate=p;
    wave_delay();
    rate_num=1/((0.000036+0.000006*rate)*64);
    clc_rate();
    disp_rate(rate_num);
    while(!change_rate);
    EX1=1;
}

源文件： http://www.jh-tec.cn/archives/8351