sig.c

单片机控制数模转换芯片DAC0832产生正弦波

#include<reg51.h>
#include <absacc.h>
#define uchar unsigned char
#define uint unsigned int
/*uchar code da[256]={0x7F,0x82,0x85,0x88,0x8B,0x8F,0x92,0x95,0x98,0x9B,0x9E,0xA1,0xA4,0xA7,0xAA,0xAD
,0xB0,0xB3,0xB6,0xB8,0xBB,0xBE,0xC1,0xC3,0xC6,0xC8,0xCB,0xCD,0xD0,0xD2,0xD5,0xD7
,0xD9,0xDB,0xDD,0xE0,0xE2,0xE4,0xE5,0xE7,0xE9,0xEB,0xEC,0xEE,0xEF,0xF1,0xF2,0xF4
,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFB,0xFC,0xFD,0xFD,0xFE,0xFE,0xFE,0xFE,0xFE
,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFD,0xFD,0xFC,0xFB,0xFB,0xFA,0xF9,0xF8,0xF7,0xF6
,0xF5,0xF4,0xF2,0xF1,0xEF,0xEE,0xEC,0xEB,0xE9,0xE7,0xE5,0xE4,0xE2,0xE0,0xDD,0xDB
,0xD9,0xD7,0xD5,0xD2,0xD0,0xCD,0xCB,0xC8,0xC6,0xC3,0xC1,0xBE,0xBB,0xB8,0xB6,0xB3
,0xB0,0xAD,0xAA,0xA7,0xA4,0xA1,0x9E,0x9B,0x98,0x95,0x92,0x8F,0x8B,0x88,0x85,0x82
,0x7F,0x7C,0x79,0x76,0x73,0x6F,0x6C,0x69,0x66,0x63,0x60,0x5D,0x5A,0x57,0x54,0x51
,0x4E,0x4B,0x48,0x46,0x43,0x40,0x3D,0x3B,0x38,0x36,0x33,0x31,0x2E,0x2C,0x29,0x27
,0x25,0x23,0x21,0x1E,0x1C,0x1A,0x19,0x17,0x15,0x13,0x12,0x10,0x0F,0x0D,0x0C,0x0A
,0x09,0x08,0x07,0x06,0x05,0x04,0x03,0x03,0x02,0x01,0x01,0x00,0x00,0x00,0x00,0x00
,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x02,0x03,0x03,0x04,0x05,0x06,0x07,0x08
,0x09,0x0A,0x0C,0x0D,0x0F,0x10,0x12,0x13,0x15,0x17,0x19,0x1A,0x1C,0x1E,0x21,0x23
,0x25,0x27,0x29,0x2C,0x2E,0x31,0x33,0x36,0x38,0x3B,0x3D,0x40,0x43,0x46,0x48,0x4B
,0x4E,0x51,0x54,0x57,0x5A,0x5D,0x60,0x63,0x66,0x69,0x6C,0x6F,0x73,0x76,0x79,0x7C};*/

uchar code da[]={ 0x7F,0x95,0xAB,0xBF,0xD1,0xE1,0xED,0xF7,0xFD,0xFE,0xFD,0xF7,0xED,0xE1,0xD1,0xBF
,0xAB,0x95,0x7F,0x69,0x53,0x3F,0x2D,0x1D,0x11,0x07,0x01,0x00,0x01,0x07,0x11,0x1D
,0x2D,0x3F,0x53,0x69,0x7F};
/*uchar code da[]={0x7F,0xAB,0xD1,0xED,0xFD,0xFD,0xED,0xD1,0xAB,0x7F,0x53,0x2D,0x11,0x01,0x01,0x11
,0x2D,0x53,0x7F};*/
uint data T=30000;
uchar data keyword,n=0;
bdata sinthr;
sbit sin_thr=sinthr^0;
sbit ww=P3^7;
keyscan()
{keyword=P3&0x1f;           //屏蔽高三位
if(keyword!=0x1f)           //有键按下
 {while((P3&0x1f)!=0x1f);   //等待按键释放
  switch(keyword)
  { 
   case 0x1e:{if(T>=65235)T=65535;else T=T+255;break;}  // 第一个键按下 增加频率
   case 0x1d:{if(T<=500)T=0;else T=T-255;break;}  //第二个键按下 减小频率
   case 0x1b:{sin_thr=~sin_thr;break;}  //第三个键按下 启动
   case 0x17:{P2=P2-10;break;}              //第四个键按下 减小输出电压
   case 0x0f:{P2=P2+10;break;}              //第五个键按下  增加输出电压
  default:break;
  }
 }
}
clermen()
{P3=0xff;
 P1=0x00;
 T=65535;
 TH1=T/256;TL1=T%256;
 TMOD=0x10;
 ET1=1;
 TR1=1;
 EA=1;
}

void time1(void) interrupt 3
{//EA=0;
//TR1=0;
TH1=T/256;
TL1=T%256;
//TR1=1;
if(sin_thr)
P1=da[n];
if(n>=36)
n=0;
else
n++;
//ww=~ww;
//EA=1;
}


main( )
{P2=0x10;
clermen();
 while(1)
 { keyscan();
 }
}