单片机正弦波程序

❶ 单片机实现正弦波的C程序

在把PC上 用C语言 编写一个程序 生成 一个周期 正弦信号 的离散值
用一个字节 8位 表示
即 0 ~ 255 表示正弦 信号 -1 到 1之间的值

单片程序 把这组0 ~ 255的 数字 放在一个 数组里
用循环 向 某个 IO口输出 这个数组
IO口接 DAC数模转换 器

❷ 如何用单片机产生正弦波，方波（附图，程序）

就是让某一个I/O口输出高低电平，例如让P0^0输出1HZ的方波吧，就是让它持续500ms的高电平，500ms的低电平，程序如下
#include
sbit
L1=P0^0;
void
delay1ms();
void
main()
{
LI=1;
delay1ms(500)
L1=0;
delay1ms(500);
}

❸ 单片机产生正弦波的程序

数不是算出来的，是正弦采样点，一共有256个点。通过DA转换输出信号的。
用示波器看，就是正弦信号，其实是一种曲线阶梯型的信号而已。
一行6个，只是一种写法，你可以写成10个，8个，随便你，但是总数不要变就行。
有空你可以看看《信号转换技术》

❹ 如何运用单片机原理制作智能信号发生器，要求产生方波、矩形波、三角波、锯齿波和正弦波。

#include<reg51.h>

#include<absacc.h>

#include<MAX72191.h>

#defineDAC XBYTE[0x7fff] //P2.7接CS

sbitkey0 = P3^2;// 增减切换键

sbitkey1 = P3^3;//个位,十位，百位，千位的控制切换

sbitkey2 = P3^4;// 调整位

sbitkey3 = P3^5;// 波形选择正弦、三角、矩形波，锯齿波

unsignedchar i,j;

unsignedint counter,step,flag;

typedefunsigned int uint;

//定时器0初始化

voidInit_Timer0(void)

{

TMOD = (TMOD & 0XF0) | 0X01;//设置工作方式和定时初始值

TH0 = 0xff;

TL0 = 0x00;

TR0 =1; //启动定时器

ET0 =1;

}

//定义输出波形的代码

unsignedchar code type[4][256]={

{ //正弦波代码

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x1, 0x1, 0x2, 0x3, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8,

0x9, 0xb,0xc, 0xd, 0xf, 0x10,0x12,0x13,0x15,0x17,0x19,0x1b,0x1d,0x1f,0x21,0x23,

0x25,0x27,0x2a,0x2c,0x2e,0x31,0x33,0x36,0x39,0x3b,0x3e,0x41,0x43,0x46,0x49,0x4c,

0x4f,0x52,0x55,0x58,0x5b,0x5e,0x61,0x64,0x67,0x6a,0x6d,0x70,0x73,0x76,0x7a,0x7d,

0x80,0x83,0x86,0x89,0x8c,0x8f,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,

0xb1,0xb4,0xb6,0xb9,0xbc,0xbf,0xc1,0xc4,0xc7,0xc9,0xcc,0xce,0xd1,0xd3,0xd5,0xd8,

0xda,0xdc,0xde,0xe0,0xe2,0xe4,0xe6,0xe8,0xea,0xeb,0xed,0xef,0xf0,0xf1,0xf3,0xf4,

0xf5,0xf6,0xf8,0xf9,0xf9,0xfa,0xfb,0xfc,0xfc,0xfd,0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,

0xfe,0xfe,0xfe,0xfe,0xfe,0xfd,0xfd,0xfc,0xfc,0xfb,0xfa,0xf9,0xf9,0xf8,0xf6,0xf5,

0xf4,0xf3,0xf1,0xf0,0xef,0xed,0xeb,0xea,0xe8,0xe6,0xe4,0xe2,0xe0,0xde,0xdc,0xda,

0xd8,0xd5,0xd3,0xd1,0xce,0xcc,0xc9,0xc7,0xc4,0xc1,0xbf,0xbc,0xb9,0xb6,0xb4,0xb1,

0xae,0xab,0xa8,0xa5,0xa2,0x9f,0x9c,0x99,0x96,0x93,0x8f,0x8c,0x89,0x86,0x83,0x80,

0x7d,0x7a,0x76,0x73,0x70,0x6d,0x6a,0x67,0x64,0x61,0x5e,0x5b,0x58,0x55,0x52,0x4f,

0x4c,0x49,0x46,0x43,0x41,0x3e,0x3b,0x39,0x36,0x33,0x31,0x2e,0x2c,0x2a,0x27,0x25,

0x23,0x21,0x1f,0x1d,0x1b,0x19,0x17,0x15,0x13,0x12,0x10,0xf,0xd, 0xc, 0xb, 0x9,

0x8,0x7, 0x6, 0x5, 0x4, 0x3, 0x3, 0x2, 0x1, 0x1, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00

},

{ //三角波代码

0x2,0x4, 0x6, 0x8, 0xa, 0xc, 0xe, 0x10,0x12,0x14, 0x16, 0x18, 0x1a,0x1c, 0x1e, 0x20,

0x22,0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30,0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, 0x40,

0x42,0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50,0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60,

0x62,0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70,0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 0x80,

0x82,0x84, 0x86, 0x88, 0x8a, 0x8c, 0x8e, 0x90,0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0,

0xa2,0xa4, 0xa6, 0xa8, 0xaa, 0xac, 0xae, 0xb0,0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc,0xbe, 0xc0,

0xc2,0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, 0xd0,0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc,0xde, 0xe0,

0xe2,0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0,0xf2, 0xf4, 0xf6, 0xf8, 0xfa, 0xfc,0xfe, 0xff,

0xfe,0xfc, 0xfa, 0xf8, 0xf6, 0xf4, 0xf2, 0xf0,0xee, 0xec, 0xea, 0xe8, 0xe6, 0xe4,0xe2, 0xe0,

0xde,0xdc, 0xda, 0xd8, 0xd6, 0xd4, 0xd2, 0xd0,0xce, 0xcc, 0xca, 0xc8, 0xc6, 0xc4,0xc2, 0xc0,

0xbe,0xbc, 0xba, 0xb8, 0xb6, 0xb4, 0xb2, 0xb0,0xae, 0xac, 0xaa, 0xa8, 0xa6, 0xa4,0xa2, 0xa0,

0x9e, 0x9c, 0x9a, 0x98, 0x96, 0x94, 0x92, 0x90,0x8e, 0x8c, 0x8a, 0x88, 0x86, 0x84, 0x82, 0x80,

0x7e, 0x7c, 0x7a, 0x78, 0x76, 0x74, 0x72, 0x70,0x6e, 0x6c, 0x6a, 0x68, 0x66, 0x64, 0x62, 0x60,

0x5e, 0x5c, 0x5a, 0x58, 0x56, 0x54, 0x52, 0x50,0x4e, 0x4c, 0x4a, 0x48, 0x46, 0x44, 0x42, 0x40,

0x3e, 0x3c, 0x3a, 0x38, 0x36, 0x34, 0x32, 0x30,0x2e, 0x2c, 0x2a, 0x28, 0x26, 0x24, 0x22, 0x20,

0x1e, 0x1c, 0x1a, 0x18, 0x16, 0x14, 0x12, 0x10,0xe, 0xc,0xa, 0x8, 0x6,0x4, 0x2, 0x00

},

{// 矩形脉冲波代码

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff, 0xff, 0xff, 0xff, 0xff,0xff, 0xff,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00,

},

{//锯齿波代码

0x00,0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,0x08,0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,

0x10,0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,0x18,0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,

0x20,0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,0x28,0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,

0x30,0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,0x38,0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,

0x40,0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,0x48,0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,

0x50,0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,0x58,0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,

0x60,0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,0x68,0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,

0x70,0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,0x78,0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,

0x80,0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,0x88,0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,

0x90,0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,0x98,0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,

0xa0,0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,0xa8,0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,

0xb0,0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,0xb8,0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,

0xc0,0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,0xc8,0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,

0xd0,0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,0xd8,0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,

0xe0,0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,0xe8,0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,

0xf0,0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,0xf8,0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff}

};

//显示子函数

Disp7219(unsignedlong dat)

{

unsigned char i;

unsigned char led[8];

led[7]=dat%10;

led[6]=dat/10%10;

led[5]=dat/100%10;

led[4]=dat/1000%10;

led[3]=dat/10000%10;

led[2]=dat/100000%10;

led[1]=dat/1000000%10;

led[0]=dat/10000000%10;

for(i=0;i<8;i++)

{

max_7219(i+1, led[i]);

}

}

//延时约1m秒

voiddelay_ms(uint n)

{

uchar j;

while(n--)

for(j=0;j<120;j++);

}

//主函数

main()

{

unsigned int f,n,j;

delay_ms(500);

Init_Max7219();//初始化7219

Disp7219(000);

Init_Timer0();

step=18;

EA = 1;

while(1)

{

if(key0 == 0) n=n+1;

if(n==2)n=0;

if(key1==0) j=j+1;

if(j==4) j=0;

if(n==0 && j == 0 &&key2 == 0) if(step<180) step+=18; //个位增

if(n==1 && j == 0 &&key2 == 0) if(step>18) step-=18; //个位减

if(n==0 && j == 1 &&key2 == 0) if(step<1800) step+=180;//十位增

if(n==1 && j == 1 &&key2 == 0) if(step>180) step-=180; //十位减

if(n==0 && j == 2 &&key2 == 0) if(step<18000) step+=1800;//百位增

if(n==1 && j == 2 &&key2 == 0) if(step>1800) step-=1800;//百位减

if(n==0 && j == 3 &&key2 == 0) if(step<54000) step+=18000;//千位增

if(n==1 && j == 3 &&key2 == 0) if(step>18000) step-=18000;//千位减

if(key3==0)flag=flag+1;if(flag==4)flag=0;

while((!key0)||(!key1)||(!key2)||(!key3));

f=step/18;

Disp7219(f);}//显示频率

}

// 定时中断服务

voidTimer0(void) interrupt 1 using 2

{

TH0 = 0xff;

TL0 = 0x00;

counter = counter + step;

DAC=type[flag][(unsignedint)counter>>8];

}

❺ 单片机C语言版正弦波信号发生器怎么做

#include<at89x51.h>
//unsigned char TIME0_H=0xec,TIME0_L=0x78; //定时器0的初值设置；全局变量
#include<sinx.h>
#include<0832.h>
void main()
{
TMOD=0X01;
TH0=0xff;
TL0=0xd9;
IT0=1; //设置中断触发方式，下降沿
EA=1;
EX0=1;
ET0=1;
IP=0X01; //键盘中断级别高
TR0=1;
while(1)
{
// square();
;
}
}

#ifndef __0832_h__
#define __0832_h__
//#define INPUT XBYTE[0xbfff] //即cs 与xfer 轮流低电平。
//#define DACR XBYTE[0x7fff] //单通道输出，单缓冲就行了。
unsigned char i,sqar_num=128; //最大值100，默认值50
unsigned char cho=0; //0：正弦波。1：方波。2：三角波。3：锯齿波。
unsigned char num=0;
unsigned char TIME0_H=0xff,TIME0_L=0xd9; //定时器0的初值设置；全局变量.对应正弦波，锯齿波50HZ
sbit chg= P1^0; //三角波100Hz.
sbit freq_u=P1^1;
sbit freq_d=P1^2;
sbit ty_u=P1^3;
sbit ty_d=P1^4;
sbit cs =P3^7;
bit flag=0;
unsigned int FREQ=50;//初始化频率,50HZ
//调节部分——频率
void freq_ud(void)
{
unsigned int temp;
if(freq_d==0)
{ FREQ--; }
else if(freq_u==0)
{ FREQ++; }
if(cho==1|cho==3) //锯齿波256次中断一周期，特殊处理下。否则他的频率是100(+\-)n*2Hz.
{
temp=0xffff-3906/FREQ; //方波，三角波默认为100hz,切换后频率也为50HZ 65336-10^6/(256*FREQ)
TIME0_H=temp/256;
TIME0_L=temp%256;
}
else if(cho==0|cho==3){ //正弦波 三角波默认周期50hz 65536-10^6//(512*FREQ)
temp=0xffff-1953/FREQ;
TIME0_H=temp/256;
TIME0_L=temp%256;
}
}
//调节部分——方波的占空比
void ty_ud(void) //方波也采用512次中断构成一个周期。
{
if(ty_d==0&sqar_num>0)
sqar_num--;
else if(ty_u==0&sqar_num<255)
sqar_num++;
}
//波形发生函数
void sint(void)
{
if(!flag)
{
cs=0;P2=sin_num[num++];cs=1;
if(num==0){num=255;flag=1;}
}
else if(flag)
{
cs=0;P2=sin_num[num--];cs=1;
if(num==255){num=0;flag=0;}
}
}
void square(void)
{
if(i++<sqar_num) {cs=0;P2=0XFF;cs=1;}
else{cs=0;P2=0X00;cs=1;}
}
void triangle(void)
{
cs=0;P2=num++;cs=1;
}
void stw(void)
{
if(~flag)
{
cs=0;P2=num++;cs=1;
if(num==0){num=255;flag=1;}
}
else if(flag)
{
cs=0;P2=num--;cs=1;
if(num==255){num=1;flag=0;}
}
}
//按键中断处理程序。
void it0() interrupt 0
{
if(chg==0) { if(++cho==4) {cho=0;num=0;} } //num=0;所有数据从新开始，保证波形的完整性
else if(freq_u==0|freq_d==0)
{freq_ud();}
else if (cho==1&(ty_d==0|ty_u==0))
{ty_ud();}
else ;
}
//定时器中断处理程序。
void intt0() interrupt 1
{
//TH0=0x00;TL0=0x00;sinx();
switch(cho)
{
case 0:{TH0=TIME0_H;TL0=TIME0_L;sint() ;break;} //正弦波//每半周期256取样。
case 1:{TH0=TIME0_H;TL0=TIME0_L;square(); break;} //方波 //为了提高方波的最高频率，只有牺牲占空比的最小可调值。分100份 每次1%。
case 2:{TH0=TIME0_H;TL0=TIME0_L;triangle();break;} //三角波
case 3:{TH0=TIME0_H;TL0=TIME0_L;stw(); break;} //锯齿波
default: ;
}
}
#endif

//正弦表；每半个周期256个取值,最大限度保证波形不失真。
//各个值通过MATLAB算出，并四设五如取整。具体程序如下
#ifndef __sinx_h__
#define __sinx_h__
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
};
#endif
//MATLAB程序:
//x=linspace(-pi/2,pi/2,255);%如果过采用1位采用，很多值是重的。虽然实际中并不会。
//y=(sin(x)+1)/2.0*255;
//%uint32(y)%强制类型转换。
//%fprintf('%.f\n',uint32(y));%控制输出类型
//round(y)%四舍五入函数

❻ 利用单片机怎么产生正弦波信号

单片机 外接AD转换芯片 再加运放 通过一定的控制程序就可产生正弦波。

实现方法：

1、通过单片机DA来实现，需要通过查表法；

2、通过PWM方式实现；

不过都需要加硬件滤波电路来实现正弦波的平滑。