firtest.c

dsp6713开发板的许多例程.对入门特别有用

/*
 *  Copyright 2003 by Texas Instruments Incorporated.
 *  All rights reserved. Property of Texas Instruments Incorporated.
 *  Restricted rights to use, duplicate or disclose this code are
 *  granted through contract.
 *  
 */
/* "@(#) XDAS 2.50.02 11-28-03 (xdas,dsk6713-a05)" */
/*
 *  ======== firtest.c ========
 *  This example shows how to use the type safe FIR "utility"
 *  library directly by an application.
 */
#include <std.h>
#include <fir.h>
#include <log.h>

#include <fir_ti.h>

#include <stdio.h>

extern far LOG_Obj trace;

Int coeff[] = {1, 2, 3, 4, 4, 3, 2, 1};
Int input[] = {1, 0, 0, 0, 0, 0, 0};

#define FRAMELEN    (sizeof (input) / sizeof (Int))
#define FILTERLEN   (sizeof (coeff) / sizeof (Int))

Int output[FRAMELEN];

static Void display(Int a[], Int n);

/*
 *  ======== main ========
 */
Int main(Int argc, String argv[])
{
    FIR_Params firParams;
    FIR_Handle fir;
    
    FIR_init();
    
    firParams = FIR_PARAMS;
    firParams.filterLen = FILTERLEN;
    firParams.frameLen = FRAMELEN;
    firParams.coeffPtr = coeff;
    if ((fir = FIR_create(&FIR_TI_IFIR, &firParams)) != NULL) {
        FIR_apply(fir, input, output);      /* filter some data */
        display(output, FRAMELEN);          /* display the result */
        FIR_delete(fir);                    /* delete the filter */
    }

    FIR_exit();

    return (0);
}

/*
 *  ======== display ========
 */
static Void display(Int a[], Int n)
{
    Int i;
    
    for (i = 0; i < n; i++) {
        LOG_printf(&trace, "%d ", a[i]);
    }

    LOG_printf(&trace, "\n");
}