volume.c

TI 公司的5000系列DSP的BIOS C语言程序,希望对大家有帮助

/*
 *  Copyright 1999 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.
 *  U.S. Patent Nos. 5,283,900  5,392,448
 */
/* "@(#) BIOS-C54x 3.01b 09-07-99 (bios54x-b15)" */
/***************************************************************************/
/*                                                                         */
/*     V O L U M E . C                                                     */
/*                                                                         */
/*     Audio gain processing using CLK ISR as data source, and a software  */
/*     interrupt for processing routine.                                   */
/*                                                                         */
/***************************************************************************/

#include "demo5402cfg.h"
#include <std.h>
#include <log.h>   

#include "volume.h"


/* Global declarations */
Int inp_buffer[BUFSIZE];       /* processing data buffers */
Int out_buffer[BUFSIZE];

Int gain = MINGAIN;             /* volume control variable */
Uns processingLoad = BASELOAD;  /* processing routine load value */


/* Objects created by the Configuration Tool */

/* Functions */
extern Void load(Uns loadValue);

Int processing(Int *input, Int *output);
Void dataIO(Void);  

void mytest()
{
   gain=1;
}



/*
 * ======== main ========
 */
Void main()   
{
     LOG_printf(&trace,"new volume example started\n");
     
           /* fall into DSP/BIOS idle loop */
    return;
}                  

/*
 *  ======== processing ========
 *
 * FUNCTION: Called from processing_SWI to apply signal processing
 *           transform to input signal.
 *
 * PARAMETERS: address of input and output buffers.
 *
 * RETURN VALUE: TRUE.
 */
Int processing(Int *input, Int *output)
{
    Int size = BUFSIZE;

    while(size--){
        *output++ = *input++ * gain;
    }
     

    /* additional processing load */ 
       
    load(processingLoad); 
                                   
    return(TRUE);
}

/*
 *  ======== dataIO ========
 *
 * FUNCTION: Called from timer ISR to fake a periodic hardware interrupt that
 *           reads in the input signal and outputs the processed signal.
 *
 * PARAMETERS: none.
 *
 * RETURN VALUE: none.
 */
Void dataIO()
{
  
}