dac.c

dsp320lf2407上的相关程序文件

#include	"math.h"

#define DAC0 port00
volatile ioport unsigned port00;   /*DAC0 IO PASS THROUGH*/
#define DAC1 port01
volatile ioport unsigned port01;   /*DAC1 IO PASS THROUGH*/ 
#define DAC2 port02
volatile ioport unsigned port02;   /*DAC2 IO PASS THROUGH*/
#define DAC3 port03
volatile ioport unsigned port03;   /*DAC3 IO PASS THROUGH*/
#define KEY port30
volatile ioport unsigned port30;   /*KEY IO*/
#define LED port40                           
volatile ioport unsigned int port40;/*LED*/

#define LDAC0 port10
volatile ioport unsigned port10;   /*DAC0 IO PASS THROUGH*/
#define LDAC1 port11
volatile ioport unsigned port11;   /*DAC1 IO PASS THROUGH*/ 
#define LDAC2 port12
volatile ioport unsigned port12;   /*DAC2 IO PASS THROUGH*/
#define LDAC3 port13
volatile ioport unsigned port13;   /*DAC3 IO PASS THROUGH*/
#define LATCHDAC port21
volatile ioport unsigned port21;   /*DAC3 IO PASS THROUGH*/


unsigned int GetSin(unsigned int index);
void DACSinOut(unsigned int count); 

extern void DACtest(void);


void DACtest(void)
{
	unsigned int temp;
	while(1)
	{
		asm("	clrc  XF");
		DACSinOut(1);
		temp=~KEY&0x00ff;
		LED=~temp;
		asm("	setc  XF");
		DACSinOut(1);	
	}
} 

unsigned int GetSin(unsigned int index)
{
    double temp;
    unsigned int tmp;
    temp=index;
	temp=(sin((temp/180)*3.1416)+1)/2*4000;
	tmp=(unsigned int)temp;
	return tmp;       	
}

void DACSinOut(unsigned int count)
{
    unsigned int tmp;
    int i,j;
    for(i=0; i<count; i++)
    {   
		for(j=0;j<360;j++)
        {   
        	tmp=GetSin(j);
			delay(5);
			LDAC0=tmp;
			delay(5);
			LDAC1=tmp;
			delay(5);
			LDAC2=tmp;
			delay(5);
			LDAC3=tmp;
			delay(5);
			LATCHDAC = 0;
        }	
    }
}