main.c

滤波器采样频率为600Hz

#include "Initial.h"
int x[2000],xx[41],count=0;
int y[2000];
float coe[41] = {
  -0.0007436801300972, -0.00966532650986, -0.02079295720964,-0.006728147279866,
    0.01276276801358,-0.003885535116695,-0.009402874677733,  0.01441705620957,
  -0.003612118610805, -0.01510028676103,  0.02177566575914,-0.003768139955797,
   -0.02603025119696,  0.03545147857124,-0.003842964931381, -0.04890680053818,
    0.06732459093614,-0.003812814832409,  -0.1341317418805,   0.2766730386758,
     0.6628425976257,   0.2766730386758,  -0.1341317418805,-0.003812814832409,
    0.06732459093614, -0.04890680053818,-0.003842964931381,  0.03545147857124,
   -0.02603025119696,-0.003768139955797,  0.02177566575914, -0.01510028676103,
  -0.003612118610805,  0.01441705620957,-0.009402874677733,-0.003885535116695,
    0.01276276801358,-0.006728147279866, -0.02079295720964, -0.00966532650986,
  -0.0007436801300972
};


extern int filter_start;
interrupt void BSP0_int() // Interrupt function
{   
	static int Data,m,i;
	float inter=0;
	Data = DRR10;
	x[count]=Data;
	
	for(i=0;i<40;i++)
	xx[40-i]=xx[39-i];
	xx[0]=Data;

	for(i=0;i<41;i++)
	inter=inter+xx[i]*coe[i];
	y[count]=(int)inter;

	DXR10 =y[count++]&0xFFFE;//(int)y[count]&0xFFFE;
	if(count==1999)
	count=0;
}

void main()
{
	asm("\t ssbx intm"); // Interrupt disable
	InitDSP();
	InitMcBSP0();
	InitAD50();
	asm("\t rsbx intm"); // Interrupt enable
	
	while(1)
	{
		asm("\t nop");  // Waiting for interrupt.
		asm("\t nop");
	}
}