tone.c

TM公司CCS平台上开发的FIR有限级数字滤波器程序。

/*
 *  Copyright 2005 by Spectrum Digital Incorporated.
 *  All rights reserved. Property of Spectrum Digital Incorporated.
 */

/*
 *  ======== tone.c ========
 *
 *  This example uses the PCM3002 codec module of the DSK5416 Board Support
 *  Library to generate a 1KHz sine wave on the audio outputs for 5 seconds.
 *  The sine wave data is calculated and stored in an array called sinetable.
 *  The codec operates at 48KHz by default.  Since the sine wave table has 48
 *  entries per period, each pass through the inner loop takes 1 millisecond.
 *  5000 passes through the inner loop takes 5 seconds.
 *
 *  Please see the DSK5416 help file for more detailed information.
 */

#include "tonecfg.h"
#include "dsk5416.h"
#include "dsk5416_pcm3002.h"
#include <math.h>

#define SINE_TABLE_SIZE 48
#define PI              ( ( double )3.1415927 )
#define SINE_MAX        0x7FFE
#define HD_SIZE			81
#define HD_MAX			0x0FFE

int sinetable[SINE_TABLE_SIZE];
double hdi[HD_SIZE];
int hd[HD_SIZE];




DSK5416_PCM3002_Config setup = {
    0x01ff, // Set-Up Reg 0 - Left  channel DAC attenuation
    0x01ff, // Set-Up Reg 1 - Right channel DAC attenuation
    0x04A2, // Set-Up Reg 2 - Various ctl e.g. power-down modes
    0x0000  // Set-Up Reg 3 - Codec data format control
};

/*
 *  InitSineTable() - Initialize the sine wave table data
 */


void InitHdTableLowPass( void )
{
    int i;
    double increment= 0;
    double radian = 0;

    increment = 0.15*PI;
//	radian= increment * (-(HD_SIZE-1)/2);
    for ( i = 0 ; i < HD_SIZE ; i++ )
    {
        if(i!=40){
	        radian=increment*(i-40);
	        hdi[i] =sin(radian)/radian;
			}
		else
			hdi[i]=1.0;
    }
	for(i=0;i<HD_SIZE;i++)
	{
		hd[i]=(int)(hdi[i]*84);
	}

}

void InitHdTableHighPass( void )
{
    int i;
    double increment= 0;
    double radian = 0;

    increment = 0.125*PI;
//	radian= increment * (-(HD_SIZE-1)/2);
    for ( i = 0 ; i < HD_SIZE ; i++ )
    {
        if(i!=40){
	        radian=increment*(i-40);
	        hdi[i] =sin(radian)/radian;
			}
		else
			hdi[i]=-7.0;
    }
	for(i=0;i<HD_SIZE;i++)
	{
		hd[i]=(int)(-hdi[i]*84);
	}

}

void InitHdTableBandPass( void )
{
    int i;
    double increment1= 0;
	double increment2= 0;
    double radian1 = 0;
	double radian2 = 0;

    increment1 = 0.425*PI;
	increment2 = 0.0375*PI;
//	radian= increment * (-(HD_SIZE-1)/2);
    for ( i = 0 ; i < HD_SIZE ; i++ )
    {
        if(i!=40){
	        radian1=increment1*(i-40);
			radian2=increment2*(i-40);
	        hdi[i] =(sin(radian1)-sin(radian2))/(i-40)/PI;
			}
		else
			hdi[i]=0.3875;
    }
	for(i=0;i<HD_SIZE;i++)
	{
		hd[i]=(int)(hdi[i]*509);
	}

}


void InitHdTableBandBlock( void )
{
    int i;
    double increment1= 0;
	double increment2= 0;
    double radian1 = 0;
	double radian2 = 0;

    increment1 = 0.3*PI;
	increment2 = 0.125*PI;
//	radian= increment * (-(HD_SIZE-1)/2);
    for ( i = 0 ; i < HD_SIZE ; i++ )
    {
        if(i!=40){
	        radian1=increment1*(i-40);
			radian2=increment2*(i-40);
	        hdi[i] =(sin(radian1)-sin(radian2))/(i-40)/PI;
			}
		else
			hdi[i]=-0.825;
    }
	for(i=0;i<HD_SIZE;i++)
	{
		hd[i]=(int)(-hdi[i]*509);
	}

}
/*
 *  UserTask() - The main user task
 */

void UserTask()
{
}
void UserTask1()
{
    DSK5416_PCM3002_CodecHandle hCodec;
    int  i,j;
	Int16  tempval;
	int tempin[HD_SIZE];
	int tempout;



    /* Initialize the sinetable[] */
//    InitHdTableLowPass();
//    InitHdTableHighPass();
//    InitHdTableBandPass();
    InitHdTableBandBlock();

    /* Start the codec */
    hCodec = DSK5416_PCM3002_openCodec( 0, &setup );
	
	DSK5416_PCM3002_setFreq(hCodec,24000);
    /* Generate a 1KHz sine wave for 5 seconds */
    for (;;)
    {
        while(!DSK5416_PCM3002_read16(hCodec,&tempval));
		while(!DSK5416_PCM3002_read16(hCodec,&tempval));

		for(i=0;i<HD_SIZE-1;i++)
			tempin[i]=tempin[i+1];
		tempin[HD_SIZE-1]=tempval/500;
		tempout=0;
		for(j=0;j<HD_SIZE;j++)
		{
			
			tempout+=tempin[j]*hd[HD_SIZE-1-j];
			
		}

        while(!DSK5416_PCM3002_write16(hCodec,tempval));
		while(!DSK5416_PCM3002_write16(hCodec,tempout));
    }

    /* Close the codec */
//    DSK5416_PCM3002_closeCodec( hCodec );
}

void main()
{
    /* Call BSL init */
    DSK5416_init();

	UserTask1();
}