libsi3000dcifill.c

Audio compression on embedded board

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*   The software supplied herewith by Microchip Technology           *
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/******************************************************************************
**
**  Filename:     libSi3000DCIFill.c
**
**  System:       RISC
**
**  Platform:     dsPIC33F
**
**  Description:  This file contains only libSi3000DCIFill( )API.This API fills
**                the user defined ping pong buffers with real time speech
**                samples from SI 3000 codec through DCI.
**                     
******************************************************************************/

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

/******************************************************************************
**
**  Function Name: libSi3000DCIFill ( )
**
**  Description:   This API is called in the DCI ISR for moving data from the
**                 DCI buffer registers RXBUFx's to the user defined ping pong
**                 buffers.It accesses members of the codecsetup structure. It
**                 has no outputs.The user should take care to set the DCI
**                 buffer length such that the number of samples per frame
**                 should be divisible by it.
**
******************************************************************************/
void __attribute__((section("libG711")))libSi3000DCIFill ( void )
{
  short *temp1;                          //Temporary variable.

  *( codecdata.sampleIpBuffer ) = RXBUF0;//DCI buffer length equal to 4.
  ( codecdata.sampleIpBuffer )++;
  *( codecdata.sampleIpBuffer ) = RXBUF1;
  ( codecdata.sampleIpBuffer )++;
  *( codecdata.sampleIpBuffer ) = RXBUF2;
  ( codecdata.sampleIpBuffer )++;
  *( codecdata.sampleIpBuffer ) = RXBUF3;
  ( codecdata.sampleIpBuffer )++;
  codecdata.countFill += BUFFERLENGTH;

  TXBUF0 = 0x0000;                     //Send digital silence to SI 3000 codec.
  TXBUF1 = 0x0000;
  TXBUF2 = 0x0000;
  TXBUF3 = 0x0000;

  /* Check if the buffer has been filled to its capacity. */
  if ( codecdata.countFill == NUMOFSAMPLESPERBLOCK )
  {
    codecdata.countFill = 0x0000;     //Clear data fill counter

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

    /* Exchange the addresses of sample buffer pointers in to the pointer
       to sample buffers to manage the user defined ping pong buffers */
	temp1                    = codecdata.sampleIpBuffer;
	codecdata.sampleIpBuffer = codecdata.sampleOpBuffer;
    codecdata.sampleOpBuffer = temp1;

    /* Set the flag to indicate that one buffer has filled to its capacity and
      is ready for use */
    codecdata.fBlockdone = 0x01;
    (codecdata.blockCount)++;
  }
}

/*-----------------------------------------------------------------------------
                              END OF FILE:  libSi3000DCIFill.c
-----------------------------------------------------------------------------*/