代码收藏家 “Proteus仿真：基于51单片机的波形发生器，配备数码管和LCD12864显示屏”
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 <reg51.h>
#include <PCF8591.h>
#include <seg.h>
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<reg51.h>
#include <math.h>
#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 <reg52.h>
#include <math.h>
#include <intrins.h>
#include <lcd12864.h>
#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;
}
