32單片機輸出方形波_如何運用單片機原理製作智能信號發生器要求產生方波、矩形波、三角波、鋸齒波和正弦波

⑴ 利用單片機和DAC0832控制輸出方形波，鋸齒波，三角波，並通過示波器顯示程序如下

單片機和DAC0832控制輸出方波，鋸齒波，三角波，正弦波。

#include<at89x51.h>

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

#include<sinx.h>

#include<0832.h>

void main()

{

TMOD=0X01;

TH0=0xff;

TL0=0xd9;

IT0=1; //設置中斷觸發方式，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；全局變數.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 ty_u=P1^3;

sbit ty_d=P1^4;

sbit cs =P3^7;

bit flag=0;

unsigned int FREQ=50;//初始化頻率,50HZ

//調節部分——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,切換後頻率也為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;

}

//調節部分——方波的占空比

void ty_ud(void) //方波也採用512次中斷構成一個周期。

{

if(ty_d==0&sqar_num>0)

sqar_num--;

else if(ty_u==0&sqar_num<255)

sqar_num++;

}

//波形發生函數

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&(ty_d==0|ty_u==0))

{ty_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，並四設五如取整。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);%如果過採用1位採用，很多值是重的。雖然實際中並不會。

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

//%uint32(y)%強制類型轉換。

//%fprintf('%.f ',uint32(y));%控制輸出類型

//round(y)%四捨五入函數

⑵ 51 單片機和DAC0832輸出方波、矩形波和正弦波由液晶1602顯示的C語言程序

顯示頻率，幅度可調，可產生四種波形，正弦波，方波，鋸齒波，三角波，希望你能喜歡，給你發了一張效果圖，喜歡的話別忘了採納我的回答啊

#include<reg52.h>

#defineucharunsignedchar

#defineuintunsignedint

#defineDAdataP0 //DA數據埠

sbitDA_S1=P2^0;//控制DAC0832的8位輸入寄存器，僅當都為0時，可以輸出數據(處於直通狀態)，否則，輸出將被鎖存

sbitDA_S2=P2^1;//控制DAC0832的8位DAC寄存器，僅當都為0時，可以輸出數據(處於直通狀態)，否則，輸出將被鎖存

sbitkey=P3^2;

ucharwavecount;//'抽點'計數

ucharTHtemp,TLtemp;//傳遞頻率的中間變數

ucharjudge=1;//在方波輸出函數中用於簡單判別作用

ucharwaveform; //當其為0、1、2時，分別代表三種波

ucharcodefreq_unit[3]={10,50,200};//三種波的頻率單位

ucharidatawavefreq[3]={1,1,1}; //給每種波定義一個數組單元，用於存放單位頻率的個數

ucharcodelcd_hang1[]={"SineWave""TriangleWave""SquareWave""SelectWave:""pressNo.1key!"};

ucharidatalcd_hang2[16]={"f=Hz"};

ucharcodewaveTH[]={

0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,

0xec,0xf6,0xf9,0xfb,0xfc,0xfc,0xfd,0xfd,0xfd,0xfe};

ucharcodewaveTL[]={

0x06,0x8a,0x10,0x4e,0x78,0x93,0xa8,0xb3,0xbe,0xc6,//正弦波頻率調整中間值

0xac,0xde,0x48,0x7a,0x99,0xaf,0xbb,0xc8,0xd0,0xde, //三角波頻率調整中間值

0x88,0x50,0x90,0x32,0x34,0xbe,0x4a,0xa3,0xe5,0x2c};

/*************************************************************************************************/

ucharcodetriangle_tab[]={ //每隔數字8，採取一次

0x00,0x08,0x10,0x18,0x20,0x28,0x30,0x38,0x40,0x48,0x50,0x58,0x60,0x68,0x70,0x78,

0x80,0x88,0x90,0x98,0xa0,0xa8,0xb0,0xb8,0xc0,0xc8,0xd0,0xd8,0xe0,0xe8,0xf0,0xf8,0xff,

0xf8,0xf0,0xe8,0xe0,0xd8,0xd0,0xc8,0xc0,0xb8,0xb0,0xa8,0xa0,0x98,0x90,0x88,0x80,

0x78,0x70,0x68,0x60,0x58,0x50,0x48,0x40,0x38,0x30,0x28,0x20,0x18,0x10,0x08,0x00};

ucharcodesine_tab[256]={

//輸出電壓從0到最大值（正弦波1/4部分）

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,

//輸出電壓從最大值到0（正弦波1/4部分）

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,

//輸出電壓從0到最小值（正弦波1/4部分）

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,

//輸出電壓從最小值到0（正弦波1/4部分）

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};

voiddelay(ucharz)

{

uintx,y;

for(x=z;x>0;x--)

for(y=110;y>0;y--);

}

voidtriangle_out() //三角波輸出

{

DAdata=triangle_tab[wavecount++];

if(wavecount>64)wavecount=0;

DA_S1=0;//打開8位輸入寄存器

DA_S1=1;//關閉8位輸入寄存器

}

voidsine_out() //正弦波輸出

{

DAdata=sine_tab[wavecount++];

DA_S1=0;//打開8位輸入寄存器

DA_S1=1;//關閉8位輸入寄存器

}

voidsquare_out()//方波輸出

{

judge=~judge;

if(judge==1)DAdata=0xff;

elseDAdata=0x00;

DA_S1=0;//打開8位輸入寄存器

DA_S1=1;//關閉8位輸入寄存器

}

/************1602液晶的相關函數*************/

#definelcd_portsP1

sbitrs=P2^2;

sbitrw=P2^3;

sbitlcden=P2^4;

voidwrite_com(ucharcom)

{

rs=0; //置零，表示寫指令

lcden=0;

lcd_ports=com;

delay(5);

lcden=1;

delay(5);

lcden=0;

}

voidwrite_date(uchardate)

{

rs=1; //置1，表示寫數據（在指令所指的地方寫數據）

lcden=0;

lcd_ports=date;

delay(5);

lcden=1;

delay(5);

lcden=0;

}

voiddisp_lcd(ucharaddr,uchar*temp1)

{

ucharnum;

write_com(addr);

delay(1);//延時一會兒???

for(num=0;num<16;num++)

{

write_date(temp1[num]);//或者這樣寫write_date(*(temp1+num));

delay(1);

}

voidinit_lcd()

{

//ucharnum;

lcden=0;//可有可無???

rw=0;//初始化一定要設置為零，表示寫數據

write_com(0x38);//使液晶顯示點陣，為下面做准備

write_com(0x0c);//初始設置

write_com(0x06);//初始設置

write_com(0x01);//清零

write_com(0x80);//使指針指向第一行第一格

disp_lcd(0x80,&lcd_hang1[3*16]);//在第一行顯示

disp_lcd(0xc0,&lcd_hang1[4*16]);//在第二行顯示

}

/********************1602液晶函數聲明結束*********************/

voidmain()

{

uchari=0;

DA_S2=0;//使DAC寄存器處於直通狀態

DAdata=0;

DA_S1=1;//關閉8位輸入寄存器

init_lcd();

waveform=0;

TMOD=0x01;//設置定時器0為16位工作方式

IT0=1;//設置外部中斷0為下降沿觸發

ET0=1;//開定時器中斷

EX0=1;

EA=1;

while(1)

{

//DAout(0xff); //可輸出TTL波形

//DAout(0x80);

//T_temp=32;

}

voidtimer0()interrupt1

{

TH0=THtemp;

TL0=TLtemp;

if(waveform==0)sine_out();

elseif(waveform==1)triangle_out();

elseif(waveform==2)square_out();

}

voidkey_int0()interrupt0

{

ucharkeytemp;

uinttotal_freq;//總頻率

EA=0;TR0=0;//關總中斷與定時器

delay(5);//延時夠嗎???

if(key==0)//確實有按鍵按下而引發中斷

{

keytemp=P3&0xf0;//獲取P3口高四位的值

switch(keytemp)

{

case0xe0: //選擇波形

waveform++;

if(waveform>2)waveform=0;

break;

case0xd0://頻率按規定單位依次增加

wavefreq[waveform]++;

if(wavefreq[waveform]>10)wavefreq[waveform]=1;///*這邊要用「>10」，因為它比「=11」可靠

break; //性更高,使加數有個上限，不會一直加下去*/

case0xb0://頻率按規定單位依次衰減

wavefreq[waveform]--;

if(wavefreq[waveform]<1)wavefreq[waveform]=10;//這邊要用「<1」，因為它比「=0」可靠性更高

break;

case0x70://TTL輸出

DA_S2=1;//使DAC寄存器關閉

break;

}

THtemp=waveTH[waveform*10+(wavefreq[waveform]-1)];//方括弧中選取第幾個數後，並把該值賦給T_temp

TLtemp=waveTL[waveform*10+(wavefreq[waveform]-1)];

total_freq=wavefreq[waveform]*freq_unit[waveform];//求輸出頻率（個數*單位）

lcd_hang2[5]=total_freq%10+0x30;//在液晶中顯示個位，(0x30在液晶顯示中表示數字0)

total_freq/=10;lcd_hang2[4]=total_freq%10+0x30;//在液晶中顯示時十位

total_freq/=10;lcd_hang2[3]=total_freq%10+0x30;//在液晶中顯示時百位

total_freq/=10;lcd_hang2[2]=total_freq%10+0x30;//在液晶中顯示時千位

disp_lcd(0x80,&lcd_hang1[waveform*16]);//在第一行顯示

disp_lcd(0xc0,lcd_hang2);//在第二行顯示

}

wavecount=0;//'抽點'計數清零

while(!key);

EA=1;TR0=1;//開啟總中斷與定時器

}

⑶ 單片機利用定時器輸出矩形波

這個問題我似乎答過:可以借鑒輸出PWM波的一般方法，要用到兩個定時器，第一個用來確定整個波的周期，例如你這里的2ms，第二個用來確定高電平的時間，例如你這里的1／3ms，過程大概是這樣的：啟動第一個定時器，把電平拉高，緊接著啟動第二個定時器，當第二個計數滿了之後，把電平拉低，關閉第二個定時器，這時就出來了一個周期的波，你重復這個過程就出來連續波了，關於定時器初值和中斷向量那些你再去找找資料吧，一言兩語說不清楚

⑷ 如何運用單片機原理製作智能信號發生器，要求產生方波、矩形波、三角波、鋸齒波和正弦波。

#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,

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;i<8;i++)

{

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

}

//延時約1m秒

voiddelay_ms(uint n)

{

uchar j;

while(n--)

for(j=0;j<120;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(step<180) step+=18; //個位增

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

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; //十位減

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;//百位減

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)counter>>8];

}

⑸ CSU32P20單片機怎樣輸出PWM方波

摘要不管上面我寫的PWM模塊代碼還是其他的情況，我們不需要完完整整的知道從頭到尾怎麼寫，我們要做的是在能夠靈活的利用這些基礎的代碼，並在這個基礎上進行修改實現更復雜的代碼。

⑹ 如何用單片機指令實現一定頻率和占空比的矩形方波

產生25khz，占空比為25%的矩形波，即：
輸出高電平10us，輸出低電平30us。

時間太短，用定時器定時，並不方便。
用 NOP 指令延時，程序如下：

LOOP:
SETB P1.0
NOP
NOP
NOP

;…………總共8個NOP

CLR P1.0
NOP
NOP
NOP

;…………總共26個NOP

JMP LOOP

END

⑺ 單片機輸出方波，觀測到方波有抖動，C程序很簡單，求分析

看到了你的程序和插圖。
你是打算讓T0在36個機器周期(大概是36us)中斷一次，輸出反相的波形。
但是，中斷，並不是嚴格按照機器周期的個數來發生的。

當主程序執行的時候，是一條一條的匯編語言指令，有些的指令是兩個機器周期的。
如果在執行「兩個機器周期的指令」期間，中間發生了定時器溢出，中斷並不會立即發生。
要等到「兩個機器周期的指令」執行完了，才會去執行中斷程序。

根據主程序當時的不同指令，中斷申請到中斷程序的進入，往往有3~8個機器周期。
這個數據，是有資料可以證明的。
當執行對中斷系統操作的指令時，耽誤的時間最長。

樓主看到的現象，其實是很正常的。

⑻ 如何實用單片機做出不規則的方波

是類似下面這種波形么：
__ ____ ______ __
___| |_____| |________| |_| |____

如果是這種的話，設置定時器為PWM模式，更改寄存器中周期、高電平時間、低電平時間的值，就可以輸出以上波形了

⑼ 用單片機利用dac0832產生三角波方波和正弦波

首先需要建立一個產生三角波、方波和正弦波的波表，然後定時將波表裡的數據通過埠刷新至dac0832，然後0832的模擬輸出埠即可輸出想要的波形，通過控制波表數值的刷新頻率即可調整輸出頻率。

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