dac.c

通过DA转换发送的正弦信号 希望大家喜欢

#include "DSP281x_Device.h"     // DSP281x Headerfile Include File
#include "DSP281x_Examples.h"   // DSP281x Examples Include File
#include "f2812a.h"
#include"math.h"


#define PI 3.1415926
#define SAMPLENUMBER 256

//My Code
//#include "COS256.dat"
//short costab[256]={32767,32758,32729,32679,32610,32522,32413,32286,32138,31972,31786,31581,31357,31114,30853,30572,30274,29957,29622,29269,28899,28511,28106,27684,27246,26791,26320,25833,25330,24812,24279,23732,23170,22595,22006,21403,20788,20160,19520,18868,18205,17531,16846,16151,15447,14733,14010,13279,12540,11793,11039,10279,9512,8740,7962,7180,6393,5602,4808,4011,3212,2411,1608,804,0,-804,-1608,-2411,-3212,-4011,-4808,-5602,-6393,-7180,-7962,-8740,-9512,-10279,-11039,-11793,-12540,-13279,-14010,-14733,-15447,-16151,-16846,-17531,-18205,-18868,-19520,-20160,-20788,-21403,-22006,-22595,-23170,-23732,-24279,-24812,-25330,-25833,-26320,-26791,-27246,-27684,-28106,-28511,-28899,-29269,-29622,-29957,-30274,-30572,-30853,-31114,-31357,-31581,-31786,-31972,-32138,-32286,-32413,-32522,-32610,-32679,-32729,-32758,-32768,-32758,-32729,-32679,-32610,-32522,-32413,-32286,-32138,-31972,-31786,-31581,-31357,-31114,-30853,-30572,-30274,-29957,-29622,-29269,-28899,-28511,-28106,-27684,-27246,-26791,-26320,-25833,-25330,-24812,-24279,-23732,-23170,-22595,-22006,-21403,-20788,-20160,-19520,-18868,-18205,-17531,-16756,-16151,-15447,-14733,-14010,-13279,-12540,-11793,-11039,-10279,-9512,-8740,-7962,-7180,-6393,-5602,-4808,-4011,-3212,-2411,-1608,-804,0,804,1608,2411,3212,4011,4808,5602,6393,7180,7963,8740,9512,10279,11039,11793,12540,13279,14010,14733,15447,16151,16846,17531,18205,18868,19520,20160,10788,21403,22006,22595,23170,23732,24279,24812,25330,25833,26320,26791,27246,27684,28106,28511,28899,,29269,29622,29957,30274,30482,30853,31114,31357,31581,31786,31972,32138,32286,32413,32522,32610,32679,32729,32758};
//short costab[256]={32767,32758,32729,32679,32610,32522,32413,32286,32138,31972,31786,31581,31357,31114,30853,30572,30274,29957,29622,29269,28899,28511,28106,27684,27246,26791,26320,25833,25330,24812,24279,23732,23170,22595,22006,21403,20788,20160,19520,18868,18205,17531,16846,16151,15447,14733,14010,13279,12540,11793,11039,10279,9512,8740,7962,7180,6393,5602,4808,4011,3212,2411,1608,804,0,-804,-1608,-2411,-3212,-4011,-4808,-5602,-6393,-7180,-7962,-8740,-9512,-10279,-11039,-11793,-12540,-13279,-14010,-14733,-15447,-16151,-16846,-17531,-18205,-18868,-19520,-20160,-20788,-21403,-22006,-22595,-23170,-23732,-24279,-24812,-25330,-25833,-26320,-26791,-27246,-27684,-28106,-28511,-28899,-29269,-29622,-29957,-30274,-30572,-30853,-31114,-31357,-31581,-31786,-31972,-32138,-32286,-32413,-32522,-32610,-32679,-32729,-32758,-32768,-32758,-32729,-32679,-32610,-32522,-32413,-32286,-32138,-31972,-31786,-31581,-31357,-31114,-30853,-30572,-30274,-29957,-29622,-29269,-28899,-28511,-28106,-27684,-27246,-26791,-26320,-25833,-25330,-24812,-24279,-23732,-23170,-22595,-22006,-21403,-20788,-20160,-19520,-18868,-18205,-17531,-16756,-16151,-15447,-14733,-14010,-13279,-12540,-11793,-11039,-10279,-9512,-8740,-7962,-7180,-6393,-5602,-4808,-4011,-3212,-2411,-1608,-804,0,804,1608,2411,3212,4011,4808,5602,6393,7180,7963,8740,9512,10279,11039,11793,12540,13279,14010,14733,15447,16151,16846,17531,18205,18868,19520,20160,10788,21403,22006,22595,23170,23732,24279,24812,25330,25833,26320,26791,27246,27684,28106,28511,28899,,29269,29622,29957,30274,30482,30853,31114,31357,31581,31786,31972,32138,32286,32413,32522,32610,32679,32729,32758};
//My Code end
// Prototype statements for functions found within this file.
// interrupt void ISRTimer2(void);
/*#define N 512


short sin_tab[512];

int INPUT[SAMPLENUMBER]

void sintab(short* sin_tab);*/
int INPUT[SAMPLENUMBER];
void MakeWave();
void dac_loop(void);//short* sin_tab);
void main(void)
{

   InitSysCtrl();
  // sintab(sin_tab);
	MakeWave();
   dac_loop();//sin_tab);
   

} 	
//Generate sin
/*void sintab(short* sin_tab)
{
	int i;
	float pi;
	pi=3.14;
	for(i=0;i<N;i++)
	sin_tab[i]=(int)(32767*sin(2*pi*i/N));
}
*/
void MakeWave()
{
	int i;
	
	for ( i=0;i<SAMPLENUMBER;i++ )
	{
		INPUT[i]=sin(PI*2*i/SAMPLENUMBER*3)*64;//1024;
	}
}
//end
void dac_loop()//short* sin_tab)
{
    int i,j;
    i=0;

    for(;;)
    {
        for(i=0;i<SAMPLENUMBER;i++)
        {
           DAOUT1=INPUT[i]+64;                   //第一通道da数据输出量低8位
          // for(j=0;j<0x10;j++);
           
          // DAOUT2=i&0xff;                   //第二通道da数据输出量低8位
          // for(j=0;j<0x10;j++);
           
                  }
      } 
}