libsi3000loaddci.c

Audio compression on embedded board

/*********************************************************************
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*                       Software License Agreement                   *
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*   The software supplied herewith by Microchip Technology           *
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/******************************************************************************
**
**  Filename:    libG711Si3000LoadDCI.c 
**
**  System:      RISC
**
**  Platform:    dsPIC33F
**
**  Description: This file contains only the API libG711Si3000LoadDCI().It 
**               retrives data from user defined ping pong buffers and loads  
**               it to the DCI TXBUFx buffer registers.
**      
******************************************************************************/

#include <p33Fxxxx.h>
#include "G711Lib_common.h"
#include "G711Lib_si3000.h"
#include "G711Lib_internal.h"

/******************************************************************************
**
**  Function Name: libSi3000LoadDCI ( ) 
**
**  Description:   This API is called in the DCI ISR for moving data from the
**                 user defined ping pong buffers to the DCI buffer registers
**                 TXBUFx's.It accesses members of codecsetup structure. It has
**                 no outputs.The user should take care to set the DCI buffer
**                 length such that the number of samples per Block should be
**                 divisible by it.
**
******************************************************************************/
void libSi3000LoadDCI ( void )
{

  /*The user should have given command for playing and one of the ping pong
    buffer should have been filled to its capacity.*/
  if ( codecdata.fStartPlay == 0x01 )
  {
    {        
      /* DCI buffer length equal to 4. */ 
      TXBUF0 = ( *codecdata.sampleExpandOpBuffer  );
      (  codecdata.sampleExpandOpBuffer )++;
      TXBUF1 = ( *codecdata.sampleExpandOpBuffer  );
      (  codecdata.sampleExpandOpBuffer  )++;
      TXBUF2 = ( *codecdata.sampleExpandOpBuffer  );
      (  codecdata.sampleExpandOpBuffer  )++;
      TXBUF3 = ( *codecdata.sampleExpandOpBuffer  );
      (  codecdata.sampleExpandOpBuffer )++;
      codecdata.countLoad  += BUFFERLENGTH;
    }
    if ( codecdata.countLoad  == NUMOFSAMPLESPERBLOCK )
	{
      /* LED3 for debugging purpose. */
      PORTDbits.RD2 ^= 0x1;

      /*After one of the ping pong sample buffer's has been played clear the
        load counter and increment blockCount.*/
      codecdata.countLoad  = 0x0000;
      ( codecdata.loadblockCount )++;

      /*Rewind the sample buffer pointer to the begining of the sample buffer*/
      codecdata.sampleExpandOpBuffer -= (NUMOFSAMPLESPERBLOCK );

      /* Clear the flag to indicate that the sample buffer had been played */
      codecdata.fBlockplayed = 0x00;
     }
   }
 }

/*-----------------------------------------------------------------------------
                          END OF FILE:libSi3000LoadDCI.c 
-----------------------------------------------------------------------------*/