xinhao.txt

DA转换信号发生器

#include <reg51.h>

#include <absacc.h>

#define uchar unsigned char

#define DA0832 XBYTE[0xffff]


uchar code tab[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

uchar code num [64]={0,5,2,0,0,2,6,0,0,1,7,3,0,1,3,0,0,1,0,4,0,0,8,6,0,0,7,4,0,0,6,5,0,0,5,7,0,0,5,2,0,0,4,7,0,0,4,3,
                     
					 0,0,4,0,0,0,3,7,0,0,3,4,0,0,3,2}

uchar code tosin[256]={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,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,0x89,0x86,0x83,0x80,0x80,0x7c,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

,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 };

uchar fun=1,b=0,c=0,d=0,e=0,tl,th;



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

uchar de1,de2;


void key1(void);

void key2(void);

void key3(void);

void key4(void);

void judge(void);

void delay(void);


void main(void)

{

TMOD=0X01;

th=0xff;

tl=0xf0;

TH0=th;

TL0=tl;

ET0=1;

EA=1;

EX1=1;

PX1=1;

IT1=1;

TR0=1;

while(1)

  {

   judge();

  }

}

void  delay(void)

{

for(de1=0;de1<200;de1++)

     for(de2=0;de2<10;de2++){;}

}


void judge(void)

{
  P1=0;

while(1)

{


P3_0=1; P3_1=1;  P3_2=0;

P1=tab[f/1000];

P3_0=0; P3_1=1;  P3_2=0;


P1=tab[f/100];

P3_0=1; P3_1=0;  P3_2=0;


P1=tab[f/10];

P3_0=0; P3_1=0;  P3_2=0;


P1=tab[f];

}


}


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(tl<0xff)

{

	tl+=0xf;

}

}

void key3(void)           //３键减小频率

{

if(th>0x00)

{

	tl-=0xf;

}

}

void key4(void)           //４键显示频率

{




}


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

{

TR0=0;

if(fun==1)

    {

    DA0832=tosin[b];             //正弦波

    b++;

    }

else if(fun==2)                //三角波

      {

       if(c<128)DA0832=c*2;

       else DA0832=(255-c)*2;

         c++;

         }

else if(fun==3)                // 方波

      {

       d++;

       if(d<=128)DA0832=0x00;

       else DA0832=0xff;

       }

else if(fun==4)                // 锯齿波

      {

       e++;

       DA0832=e;

       }

TH0=th;

TL0=tl;

TR0=1;

}


void  int0 (void) interrupt 2       //int0中断服务程序

{

   if(P2==0xef) key1();

   if(P2==0xdf) key2();

   if(P2==0xbf) key3();

   if(P2==0x7f) key4();

   delay();

}