libsi3000startsampling.c

Audio compression on embedded board

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*   The software supplied herewith by Microchip Technology           *
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/******************************************************************************
**
**  Filename:     libSi3000PMStartSampling.c
**
**  System:       RISC
**
**  Platform:     dsPIC33F
**
**  Description:  This file contains only the libSi3000PMStartSampling
**                (short* expandbuf1,short* expandbuf2,
**                short*  buffer1,short*  buffer2) API. It enables the user to
**                start sampling speech data from the SI 3000 codec.
**       
******************************************************************************/

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

/******************************************************************************
**
**  FunctionName: libSi3000StartSampling ( )
**
**  Description:  This API enables the user to start sampling speech data from
**                SI3000 codec.This API has four inputs which have to be passed
**                to it as parameters, it also accesses the codecsetup
**                structure members.Both the parameters are pointers to user
**                defined sample buffers.These buffers will be handled as ping
**                pong buffers.i.e.when data is being filled in one buffer the
**                other buffer will be used to retrieve already stored data and
**                vice versa when the other buffer is being filled with data.
**
******************************************************************************/
void libSi3000StartSampling (
 short *expandbuf1,
 short *expandbuf2,
 short *buffer1,
 short *buffer2 )
{
  /* Initialize the sample buffer 1 pointer to one of the user defined ping
     pong buffers */
  codecdata.sampleExpandIpBuffer = expandbuf1;

  /* Initialize the sample buffer 2 pointer to the other user defined ping
     pong sample buffer */
  codecdata.sampleExpandOpBuffer = expandbuf2;

  /* Initialize the sample buffer 11 pointer to one of the user defined ping
     pong buffers */
  codecdata.sampleComprsIpBuffer = buffer1;

  /* Initialize the sample buffer 12 pointer to one of the user defined ping
     pong buffers */
  codecdata.sampleComprsOpBuffer = buffer2;

  codecdata.blockCount = 0x0000;       //Clear the flag for playing new record.

  _DCIIF = 0x00;				       //Clear the DCI interrupt flag
  _DCIIP =  g711.dciintpri;            //Set Interrupt Priority of DCI.

  /* Send digital silence to the output And start sampling speech data from
     SI 3000 */
  TXBUF0 = 0x0000;
  TXBUF1 = 0x0000;
  TXBUF2 = 0x0000;
  TXBUF3 = 0x0000;

  _DCIIF = 0x00;                       //Clear DCI interrupt flag .
  _DCIIE = 0x01;					   //Enable DCI interrupts
  _DCIEN = 0x01;					   //Enable the DCI peripheral. 							             
}
/*-----------------------------------------------------------------------------
                          END OF FILE: libSi3000StartSampling.c
-----------------------------------------------------------------------------*/