單片機C語言版信號發(fā)生器

單片機信號發(fā)生器，一般是通過控制單片機的IO的高低電平來實現(xiàn)的，具體為

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1，可以通過先配置一個管腳為輸出，然后給這個管腳寫0，輸出就為低電平，然后寫1，這個管腳就輸出為高電平。如果你的單片機是3.3v供電的話，那么高電平一般為3.3V，低電平一般為0v。

2，如果要產生一個方波的話，需要先輸出1，然后延遲一段時間，然后再輸出0，然后再延遲一段時間，然后輸出1.... 要如此反復的話，可以用while(1), 然后在while(1)里面寫入你的置高，延遲，置低的代碼，具體偽代碼可以為

配置對應輸出管腳為輸出； //因為管腳可以配置為輸出和輸入，所以需要先配置為輸出

while(1)

{

對對應輸出管腳置高；

sleep(半個周期的時間);

對對應輸出管腳置低;

sleep(半個周期的時間);

}

3, 如果你牽涉到高級應用的話，比如要輸出一個正弦波，那么需要外加信號產生芯片，比如DDS芯片。

4，如果還需要更加復雜的信號，任意波形的，可以用一個片內DA按照你的意思輸出對應的電平，或者片外DA來輸出。

求一個正確的基于51單片機的函數信號發(fā)生器的C程序

#includereg51.h

#includeabsacc.h

#includeMAX72191.h

#defineDAC XBYTE[0x7fff] //P2.7接CS

sbitkey0 = P3^2;// 增減切換鍵

sbitkey1 = P3^3;//個位,十位，百位，千位的控制切換

sbitkey2 = P3^4;// 調整位

sbitkey3 = P3^5;// 波形選擇正弦、三角、矩形波，鋸齒波

unsignedchar i,j;

unsignedint counter,step,flag;

typedefunsigned int uint;

//定時器0初始化

voidInit_Timer0(void)

{

TMOD = (TMOD 0XF0) | 0X01;//設置工作方式和定時初始值

TH0 = 0xff;

TL0 = 0x00;

TR0 =1; //啟動定時器

ET0 =1;

}

//定義輸出波形的代碼

unsignedchar code type[4][256]={

{ //正弦波代碼

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

},

{ //三角波代碼

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

},

{// 矩形脈沖波代碼

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,

},

{//鋸齒波代碼

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}

};

//顯示子函數

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;i8;i++)

{

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

}

}

//延時約1m秒

voiddelay_ms(uint n)

{

uchar j;

while(n--)

for(j=0;j120;j++);

}

//主函數

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(step180) step+=18; //個位增

if(n==1 j == 0 key2 == 0) if(step18) step-=18; //個位減

if(n==0 j == 1 key2 == 0) if(step1800) step+=180;//十位增

if(n==1 j == 1 key2 == 0) if(step180) step-=180; //十位減

if(n==0 j == 2 key2 == 0) if(step18000) step+=1800;//百位增

if(n==1 j == 2 key2 == 0) if(step1800) step-=1800;//百位減

if(n==0 j == 3 key2 == 0) if(step54000) step+=18000;//千位增

if(n==1 j == 3 key2 == 0) if(step18000) step-=18000;//千位減

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

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

f=step/18;

Disp7219(f);}//顯示頻率

}

// 定時中斷服務

voidTimer0(void) interrupt 1 using 2

{

TH0 = 0xff;

TL0 = 0x00;

counter = counter + step;

DAC=type[flag][(unsignedint)counter8];

}

單片機C語言版正弦波信號發(fā)生器怎么做？

#includeat89x51.h

//unsigned char TIME0_H=0xec,TIME0_L=0x78; //定時器0的初值設置；全局變量

#includesinx.h

#include0832.h

void main()

{

TMOD=0X01;

TH0=0xff;

TL0=0xd9;

IT0=1; //設置中斷觸發(fā)方式，下降沿

EA=1;

EX0=1;

ET0=1;

IP=0X01; //鍵盤中斷級別高

TR0=1;

while(1)

{

// square();

;

}

}

#ifndef __0832_h__

#define __0832_h__

//#define INPUT XBYTE[0xbfff] //即cs 與xfer 輪流低電平。

//#define DACR XBYTE[0x7fff] //單通道輸出，單緩沖就行了。

unsigned char i,sqar_num=128; //最大值100，默認值50

unsigned char cho=0; //0：正弦波。1：方波。2：三角波。3：鋸齒波。

unsigned char num=0;

unsigned char TIME0_H=0xff,TIME0_L=0xd9; //定時器0的初值設置；全局變量.對應正弦波，鋸齒波50HZ

sbit chg= P1^0; //三角波100Hz.

sbit freq_u=P1^1;

sbit freq_d=P1^2;

sbit duty_u=P1^3;

sbit duty_d=P1^4;

sbit cs =P3^7;

bit flag=0;

unsigned int FREQ=50;//初始化頻率,50HZ

//調節(jié)部分——頻率

void freq_ud(void)

{

unsigned int temp;

if(freq_d==0)

{ FREQ--; }

else if(freq_u==0)

{ FREQ++; }

if(cho==1|cho==3) //鋸齒波256次中斷一周期，特殊處理下。否則他的頻率是100(+\-)n*2Hz.

{

temp=0xffff-3906/FREQ; //方波，三角波默認為100hz,切換后頻率也為50HZ 65336-10^6/(256*FREQ)

TIME0_H=temp/256;

TIME0_L=temp%256;

}

else if(cho==0|cho==3){ //正弦波 三角波默認周期50hz 65536-10^6//(512*FREQ)

temp=0xffff-1953/FREQ;

TIME0_H=temp/256;

TIME0_L=temp%256;

}

}

//調節(jié)部分——方波的占空比

void duty_ud(void) //方波也采用512次中斷構成一個周期。

{

if(duty_d==0sqar_num0)

sqar_num--;

else if(duty_u==0sqar_num255)

sqar_num++;

}

//波形發(fā)生函數

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;}

}

}

//按鍵中斷處理程序。

void it0() interrupt 0

{

if(chg==0) { if(++cho==4) {cho=0;num=0;} } //num=0;所有數據從新開始，保證波形的完整性

else if(freq_u==0|freq_d==0)

{freq_ud();}

else if (cho==1(duty_d==0|duty_u==0))

{duty_ud();}

else ;

}

//定時器中斷處理程序。

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取樣。

case 1:{TH0=TIME0_H;TL0=TIME0_L;square(); break;} //方波 //為了提高方波的最高頻率，只有犧牲占空比的最小可調值。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;} //鋸齒波

default: ;

}

}

#endif

//正弦表；每半個周期256個取值,最大限度保證波形不失真。

//各個值通過MATLAB算出，并四設五如取整。具體程序如下

#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);%如果過采用1位采用，很多值是重的。雖然實際中并不會。

//y=(sin(x)+1)/2.0*255;

//%uint32(y)%強制類型轉換。

//%fprintf('%.f\n',uint32(y));%控制輸出類型

//round(y)%四舍五入函數

跪求單片機大神幫我解析下面函數信號發(fā)生器的代碼（C語言）

你貼的代碼里那幾個數組沒有用到啊，暫時不知道干什么的，初步猜測估計是液晶的點陣數據，main函數里也就是初始化了定時器和lcd液晶屏，不停的掃描按鍵鍵值，定時中斷里應該還有很多東西，這里看不到。

需要問具體的話可以把程序發(fā)我郵箱吧：cxz1088cxz@vip.qq.com

分享文章：單片機c語言函數發(fā)生器,單片機原理及應用c語言編程
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