aud_drv.c

MP3播放器详细设计方案

/*C**************************************************************************
* $RCSfile: aud_drv.c,v $
*----------------------------------------------------------------------------
* Copyright (c) 2002 Atmel.
*----------------------------------------------------------------------------
* RELEASE:      $Name: DEMO_FAT_1_9_9 $      
* REVISION:     $Revision: 1.3 $     
* FILE_CVSID:   $Id: aud_drv.c,v 1.3 2002/05/24 09:51:12 njourdan Exp $       
*----------------------------------------------------------------------------
* PURPOSE:
* This file contains the audio interface driver routines
*
* NOTES:
* Driver Configuration:
*   - None
* Global Variables:
*   - None
*****************************************************************************/

/*_____ I N C L U D E S ____________________________________________________*/

#include "config.h"                         /* system configuration */
#include "aud_drv.h"                        /* audio driver definition */


/*_____ M A C R O S ________________________________________________________*/


/*_____ D E F I N I T I O N ________________________________________________*/


/*_____ D E C L A R A T I O N ______________________________________________*/


/*F**************************************************************************
* NAME: aud_set_prio
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
* Set the audio interface priority interrupt
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* ram/xram:
* cycle:
* stack: 
* code:
*****************************************************************************/
void aud_set_prio (Byte priority)
{
  if ((priority == 1) || (priority == 3))     /* set LSB priority bit */
  {
    IPL0 |=  MSK_EAUD;
  }
  if ((priority == 2) || (priority == 3))     /* set MSB priority bit */
  {
    IPH0 |= MSK_EAUD;
  }
}


/*F**************************************************************************
* NAME: aud_stop
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
* Disable the audio interface
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* ram/xram:
* cycle:
* stack: 
* code:
*****************************************************************************/
void aud_stop (void)
{
  Aud_disable();
  Aud_disable_int();
}


/*L**************************************************************************
* NAME: aud_int
*----------------------------------------------------------------------------
* PARAMS:
*
* return:
*----------------------------------------------------------------------------
* PURPOSE:
* Audio interrupt function
*----------------------------------------------------------------------------
* EXAMPLE:
*----------------------------------------------------------------------------
* NOTE:
* ## Defined in an other c file ##
* IRQ_AUD defined in extxxxx.h
*----------------------------------------------------------------------------
* REQUIREMENTS: 
* ram/xram:
* cycle:
* stack: 
* code:
*****************************************************************************/
//Interrupt(aud_int (void), IRQ_AUD)