单片机实现信号发生器原理图和源代码

利用AT89S51和DAC0832实现的函数信号发生器，可产生方波，正弦波、三角波以及锯齿波。并可以实现调频和调幅两各功能，而且可频率实时显示.绝对原创. 2011.5.21 现在已转软件开发，今天看到大家反应太贵，现下调到了5分，然后根据原理图焊板时请在P0口加上上拉电阻，不然得不到输出波形

#include 

#include 

#define uchar unsigned char

#define DA0832 XBYTE[0xffff]


uchar code tab[10]={0x3f0x060x5b0x4f0x660x6d0x7d0x070x7f0x6f};

uchar code tosin[256]={0x800x830x860x890x8d0x900x930x960x990x9c0x9f0xa20xa50xa80xab0xae0xb10xb40xb70xba0xbc0xbf0xc20xc5

0xc70xca0xcc0xcf0xd10xd40xd60xd80xda0xdd0xdf0xe10xe30xe50xe70xe90xea0xec0xee0xef0xf10xf20xf40xf5

0xf60xf70xf80xf90xfa0xfb0xfc0xfd0xfd0xfe0xff0xff0xff0xff0xff0xff0xff0xff0xff0xff0xff0xff0xfe0xfd

0xfd0xfc0xfb0xfa0xf90xf80xf70xf60xf50xf40xf20xf10xef0xee0xec0xea0xe90xe70xe50xe30xe10xde0xdd0xda

0xd80xd60xd40xd10xcf0xcc0xca0xc70xc50xc20xbf0xbc0xba0xb70xb40xb10xae0xab0xa80xa50xa20x9f0x9c0x99

0x960x930x900x8d0x890x860x830x800x800x7c0x790x760x720x6f0x6c0x690x660x630x600x5d0x5a0x570x550x51

0x4e0x4c0x480x450x430x400x3d0x3a0x380x350x330x300x2e0x2b0x290x270x250x220x200x1e0x1c0x1a0x180x16

0x150x130x110x100x0e0x0d0x0b0x0a0x090x080x070x060x050x040x030x020x020x010x000x000x000x000x000x00

0x000x000x000x000x000x000x010x02 0x020x030x040x050x060x070x080x090x0a0x0b0x0d0x0e0x100x110x130x15

0x160x180x1a0x1c0x1e0x200x220x250x270x290x2b0x2e0x300x330x350x380x3a0x3d0x400x430x450x480x4c0x4e 

0x510x550x570x5a0x5d0x600x630x66 0x690x6c0x6f0x720x760x790x7c0x80 };

uchar fun=1b=0c=0d=0e=0tlth;


sbit  P3_0=P3^0;
sbit  P3_1=P3^1;
sbit  P3_2=P3^2;


void key1（void）;

void key2（void）;

void key3（void）;

void key4（void）;

void judge（void）;


void main（void）

{

TMOD=0X01;

th=0xff;

tl=0x00;

TH0=th;

TL0=tl;

ET0=1;

EA=1;

TR0=1;

while（1）

  {

   judge（）;

  }

}


void judge（void）

{
   uchar linede1de2keym;

P2=0xff;

keym=P2;

if（keym==0xff）return;

for（de1=0;de1<200;de1++）

     for（de2=0;de2<125;de2++）{;}

P2=0xff;

keym=P2;

if（keym==0xff）return;

P2=0xff;

line=P2;



   if（P2==0xfe） key1（）;

   if（P2==0xfd） key2（）;

   if（P2==0xfb） key3（）;

   if（P2==0xf7） key4（）;


}


void key1（void）             //１键选择发波类型1为正弦波2为三角波3为方波

{

fun++;

if（fun==5）fun=0x01;


}


void key2（void）            //２键加大频率

{

if（th<0xff）th++;

}

void key3（void）           //３键减小频率

{

if（th>0x00）th--;

}


void key4（void）           //４键显示频率

{

double t;

int f;

TR0=0;//ＥＴ０的区别

while （P2==0xf7）

{

t=（65535-th*256-tl）*0.5;

f=（int）（15625/（t*4））;

P3_0=0; P3_1=0;  P3_2=0;

P1=tab[f%10];

f=f/10;

P3_0=1; P3_1=0;  P3_2=0;

P1=tab[f%10];

f=f/10;

P3_0=0; P3_1=1;  P3_2=0;

P1=tab[f%10];

f=f/10;

P3_0=1; P3_1=1;  P3_2=0;

P1=tab[f];

}

TR0=1;


}


void time0_int（void） interrupt 1   //中断服务程序

{

TR0=0;

if（fun==1）

    {

    DA0832=tos

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件      13194  2009-06-05 21:09  xinhao\bestsave.rte

     文件     172992  2009-06-16 14:36  xinhao\Last Loaded xinhao.DBK

     文件       3526  2009-06-01 22:03  xinhao\xinhao.c

     文件        132  2009-06-05 21:10  xinhao\xinhao.DO

     文件     179634  2009-06-19 13:08  xinhao\xinhao.DSN

     文件      27483  2009-06-05 21:10  xinhao\xinhao.EDF

     文件       2874  2009-06-16 14:27  xinhao\xinhao.hex

     文件        209  2009-06-05 21:10  xinhao\xinhao.log

     文件       1008  2009-06-23 15:29  xinhao\xinhao.PWI

     文件      11839  2009-06-05 21:10  xinhao\xinhao.sts

     文件       3653  2009-06-05 13:57  xinhao\xinhao.txt

     文件       3930  2009-06-16 14:27  xinhao\信号发生器程序文档.c

     目录          0  2009-06-23 15:29  xinhao

----------- ---------  ---------- -----  ----

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