/*******鋸齒波程序*******/

#include "reg51.h"

#include

#define DOUT XBYTE[0x7fff]

void delay(unsigned char x)

{ unsigned char y;

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

}

void DAconvert(unsigned char k)

{ DOUT=k;

delay(15);

}

void juchi()

{ unsigned char b;

for(b=0;b<255;b++)

DAconvert(b);

}

void main(void)

{ while(1)

{ juchi();

}

}

/*******方波程序*******/

#include "reg51.h"

#include

#define DOUT XBYTE[0x7fff]

void delay(unsigned char x)

{ unsigned char y;

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

}

void DAconvert(unsigned char k)

{ DOUT=k;

delay(15);

}

void fangbo(void)

{ DAconvert(0x00);delay(100);

DAconvert(0xff);delay(100);

}

void main(void)

{ while(1)

{ fangbo();

}

}

/*******三角波程序*******/

#include "reg51.h"

#include

#define DOUT XBYTE[0x7fff]

void delay(unsigned char x)

{

unsigned char y;

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

}

void DAconvert(unsigned char k)

{

DOUT=k;

delay(15);

}

void sanjiao(void)

{

unsigned char a;

for(a=0;a<255;a++)

DAconvert(a);

for(a=255;a>0;a--)

DAconvert(a);

}

void main(void)

{

while(1)

{

sanjiao();

}

}

/*******正弦波程序*******/

#include "reg51.h"

#include

#define DOUT XBYTE[0x7fff]

char code dat[]={

0x80,0x83,0x86,0x89,0x8d,0x90,0x93,0x96,0x99,0x9c,0x9f,0xa2,0xa5,0xa8,0xab,0xae,

0xb1,0xb4,0xb7,0xbc,0xbf,0xc2,0xc5,0xc7,0xca,0xcc,0xcf,0xd1,0xd4,0xd6,0xd8,0xda,

0xdd,0xdf,0xe1,0xe3,0xe5,0xe7,0xe9,0xea,0xec,0xee,0xf1,0xf2,0xf4,0xf5,0xf6,0xf7,

0xf8,0xf9,0xfa,0xfa,0xfb,0xfc,0xfd,0xfd,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,

0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0xfd,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,

0xf4,0xf3,0xf2,0xf1,0xef,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,0x5d,0x5a,

0x57,0x55,0x51,0x4e,0x4c,0x48,0x45,0x43,0x40,0x3d,0x3a,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,0x5d,0x60,0x63,0x66,0x69,0x6c,0x6f,

0x72,0x76,0x79,0x7c,0x80};

void delay(unsigned char x)

{

unsigned char y;

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

}

void DAconvert(unsigned char k)

{ DOUT=k;

delay(15);

}

void sine(void)

{ int a;

for(a=0;a<262;a++)

DAconvert(dat[a]);

}

void main(void)

{

while(1)

{

sine();

}

}