dciisr_fullduplex.c

Audio compression on embedded board

/*********************************************************************
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*                       Software License Agreement                   *
*                                                                    *
*   The software supplied herewith by Microchip Technology           *
*   Incorporated (the "Company") for its dsPIC controller            *
*   is intended and supplied to you, the Company's customer,         *
*   for use solely and exclusively on Microchip dsPIC                *
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/******************************************************************************
**
**  Filename:     dciIsr_FullDuplex.c
**
**  System:       RISC
**
**  Platform:     dsPIC30F6014A
**
**  Description:  This file contains only one ISR for handling DCI interrupt.
******************************************************************************/

#include "p30fxxxx.h"
#include "G711Lib_common.h"
#include "G711Lib_si3000.h"

//-----------------------------------------------------------------------------
//Global Variables
//-----------------------------------------------------------------------------
extern volatile unsigned int fRxCpl, fRxstart, fRxstop;

/******************************************************************************
**
**  Function Name: _DCIInterrupt
**
**  Description:  This ISR for DCI interrupt handles data reads and writes
**                from/to DCI buffer registers TXBUFx and RXBUFx-and
**                stores/retrieves  data to/from the ping pong buffers created
**                by the user.
******************************************************************************/
void __attribute__((interrupt, no_auto_psv))  _DCIInterrupt ( void )
{
  /*This function fills data into ping pong buffer from Si3000 RXBUFx registers*/
  libSi3000DCIFill ( );
 
  if( codecdata.fBlockplayed == 0x01 )
  { 
    /*This function loads data from ping pong buffers to Si3000 TXBUFx registers*/
    libSi3000LoadDCI ( );
  }

  /*This Section Detects Whether the Data is being Transmitted from the Other
    board has Stopped*/
  if ( ( codecdata.blockCount-codecdata.loadblockCount ) > 1 )
  {
    IEC0bits.U1RXIE = 0x00;                   //Disable the U2 Interrupt.
	IFS0bits.U1RXIF = 0x00;		              //Clear Rx interrupt flag.
    fRxstop = 1;            //Set the Error flag indicating Incoming Data Stopped
    fRxCpl = 0;                                   
    codecdata.fBlockplayed = 0x00;
    while ( !U1STAbits.TRMT );
    U1TXREG = 0x16;                             //Send the Error Code.
  }
  _DCIIF = 0x00;                              //Clear DCI interrupt flag.
}

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