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電路是用AD7520與AD711組成的電路做的信號發(fā)生，可以產(chǎn)生正弦波，三角波，方波等。
但對于如何控制波形的頻率好像不太行，我全速執(zhí)行的。出來的頻率才1K左右。。
怎么這樣啊！！
有誰有經(jīng)驗的嗎？
望賜教一二！！！！





程序以下：

#include "reg51.h"
#include "intrins.h"

#define uchar unsigned char
#define uint unsigned int
uchar const code sin_data[]=
{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,0x79,0x78,0x72,0x6F,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,};//正弦碼表，可通過SIN（）函數(shù)獲得
void fb(void);
void czb(void);
void zsb(void);
void gcb(void); //鋸齒波

void delay(uchar count);

sbit one=P0^0;
sbit two=P0^1;

void main (void)
{
one=0;
two=0;
while(1)
{
fb(); //方波
// zsb(); //正弦波
//czb(); //三角波
// gcb(); //鋸齒波
}
}

void fb(void) //方波
{

P2=0x00;
P0=0x00;
delay(10);

P2=0xff;
P0=0xff;
delay(10);
}

void czb(void) //三角波
{
uint i,j;
for(i=0;i<200;i++)
P2=i;
P0=0;
for(j=200;j>0;j--)
P2=j;
P0=0;
}
void gcb(void) //鋸齒波
{
uint i;
for(i=0;i<256;i++)
P2=i;
//delay(10);
}


void zsb(void) //正弦波
{
uint k;
for(k=0;k<256;k++)
{
P2=sin_data[k];
delay(1);
}

}
void delay(uchar count)
{
uchar i,j;
for(i=0;i<count;i++)
for(j=0;j<123;j++)
;
}
[ 此貼被w419013773在2009-07-29 08:58重新編輯 ]