libuart1receiveisr.c

Audio compression on embedded board

/*********************************************************************
*                                                                    *
*                       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                *
*   products. The software is owned by the Company and/or its        *
*   supplier, and is protected under applicable copyright laws. All  *
*   rights are reserved. Any use in violation of the foregoing       *
*   restrictions may subject the user to criminal sanctions under    *
*   applicable laws, as well as to civil liability for the breach of *
*   the terms and conditions of this license.                        *
*                                                                    *
*   THIS SOFTWARE IS PROVIDED IN AN "AS IS" CONDITION.  NO           *
*   WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING,    *
*   BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND    *
*   FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE     *
*   COMPANY SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL,  *
*   INCIDENTAL OR CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.  *
*                                                                    *
*********************************************************************/

/******************************************************************************
**
**  Filename:     libuart1ReceiveIsr.c
**
**  System:       RISC
**
**  Platform:     dsPIC33F
**
**  Description:  This file contains only only one ISR for handling UART1 interrupt.
******************************************************************************/

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

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

/******************************************************************************
**
**  Function Name: _U1RXInterrupt
**
**  Description:   This ISR for UART1 interrupt handles data reads and writes 
**                 from/to UART1 buffer registers U1TXREG and U1RXREG and 
**                 stores/retrieves data to/from the ping pong buffers created
**				   by  the user.
*******************************************************************************/
void __attribute__((interrupt, no_auto_psv))  _U1RXInterrupt(void)
{ 

  short* temp;

  while( !U1STAbits.URXDA ) ;  
  libuart1Receive ( );                        //This API receives compressed
  RXcount += 1;                               //samples.

  /* Check whether a Full Block is Received */
  if ( RXcount == NUMOFSAMPLESPERBLOCK )
  {
    fRxCpl = 1;                               //Flag to indicate that a 
                                              // complete Block is received.
    PORTDbits.RD0 ^= 0x1;                     //LED for Debugging Purpose.
    fRxstart = 1;                             //Flag to indicate that data 
                                              //Reception was active.
    codecdata.sampleComprsOpBuffer -= RXcount;
    RXcount = 0;
  }
  IFS0bits.U1RXIF = 0x00;                     //Clear UART1 receive interrupt
                                              //flag.
}

/*-----------------------------------------------------------------------------
					  END OF FILE:libuart1ReceiveIsr.c
-----------------------------------------------------------------------------*/