audio.c

DSP6000,bios APPLICATIONS 源码程序

/*
 *  Copyright 2000 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
 */
/* "@(#) DSP/BIOS 4.00 03-27-00 (barracuda-e08)" */
/*
 *  ======== audio.c ========
 */

#include <std.h>

#include <pip.h>    
#include <swi.h>
#include <log.h>

#include <trc.h>
                 
/* The following external objects are defined in the config file audio.cdb */
extern far LOG_Obj trace;           /* application printf() log */ 

static Void error(Void);        /* called if an error occurs */
extern Void DSS_init(Void);     /* Initialize codec and serial port */
extern Void AUDIO_load(Int);    /* */
Void load(Int );                /* simulate CPU load */


Int loadVal = 0; 
                    
                    
/*
 *  ======== main ========
 */
Void main()
{                
    DSS_init(); 
    LOG_printf(&trace, "Audio example started!!\n");    
    
    /* fall into BIOS idle loop */
    return;                 
}

/*
 *  ======== audio ========
 */
Void audio(PIP_Obj *in, PIP_Obj *out)
{
    Uns         *src, *dst;
    Uns         size;

    if (PIP_getReaderNumFrames(in) == 0 || PIP_getWriterNumFrames(out) == 0) {
        error();
    }

    /* get input data and allocate output buffer */
    PIP_get(in);
    PIP_alloc(out);

    /* copy input data to output buffer */
    src = PIP_getReaderAddr(in);
    dst = PIP_getWriterAddr(out);


    size = PIP_getReaderSize(in);
    PIP_setWriterSize(out,size);

    for (; size > 0; size--) {
        *dst++ = *src++;
    }

    /* output copied data and free input buffer */
    PIP_put(out);
    PIP_free(in);
        
}


/*
 *  ======== error ========
 */
static Void error(Void)
{
    LOG_printf(&trace, "Error: audio signal falsely triggered!");
    
    for (;;) {
        ;       /* loop for ever */
    }
}


/*
 *  ======== load ========
 */
Void load(Int prd_ms)
{
    static int oldLoad = 0;

    /* display confirmation of load changes */
    if (oldLoad != loadVal ) {
        oldLoad = loadVal;
        LOG_printf(&trace,
           "load: new load = %d000 instructions every %d ms", loadVal, prd_ms);
    }
    
    if (loadVal) {
        AUDIO_load(loadVal);
    }   
}

/*
 *  ======== step ========
 */
Void step(void)
{
    static Int direction = 1;

    if (loadVal > 800) {
        direction = -1;
    }
    if (loadVal <= 0) {
        direction = 1;
    }

    loadVal = loadVal + (100 * direction);
}