exp09.c

来自「DSP5000实验箱上完整的实验程序,很有参考价值」· C语言 代码 · 共 51 行

extern void Da(void);
#include <math.h>
#define pi 3.1415926

/***********************************************************************
** Main Function Program
***********************************************************************/ 

#include "math.h"
#include "stdio.h"
#define  N  255
#define  pi 3.1415926

void main()
{
	int i;
	double x0,x1,x2,x3;
	double x,r,xx,y[N+1];
	int *py = (int*)0x3000;
	r=2*pi/N;

	for (i=0; i<=N; i++)
	{
		x = i*r-pi;
		xx = x*x;
		x0 = 1-xx/(8*9);
		x1 = 1-x0*xx/(6*7);
		x2 = 1-x1*xx/(4*5);
		x3 = 1-x2*xx/(2*3);

		y[i] = x * x3;
	}

	i = 0;
	
	for (;;)
	{
		for (i=0; i<=N-1; i++)
		{
			*py = (int)(y[i]*125+125);
	   		Da(); 
	   	}
    	} 
}
/***********************************************************************
** End of File 
***********************************************************************/