lxdream.org :: lxdream/src/aica/aica.c r23:1ec3acd0594d

tree revision 29:c29373ff63ee

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     1 /**

     2  * $Id: aica.c,v 1.4 2005-12-23 11:44:55 nkeynes Exp $

     3  *

     4  * This is the core sound system (ie the bit which does the actual work)

     5  *

     6  * Copyright (c) 2005 Nathan Keynes.

     7  *

     8  * This program is free software; you can redistribute it and/or modify

     9  * it under the terms of the GNU General Public License as published by

    10  * the Free Software Foundation; either version 2 of the License, or

    11  * (at your option) any later version.

    12  *

    13  * This program is distributed in the hope that it will be useful,

    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    16  * GNU General Public License for more details.

    17  */

    19 #include "dream.h"

    20 #include "modules.h"

    21 #include "mem.h"

    22 #include "aica.h"

    23 #define MMIO_IMPL

    24 #include "aica.h"

    26 MMIO_REGION_READ_DEFFN( AICA0 )

    27 MMIO_REGION_READ_DEFFN( AICA1 )

    28 MMIO_REGION_READ_DEFFN( AICA2 )

    30 void aica_init( void );

    31 void aica_reset( void );

    32 void aica_start( void );

    33 void aica_stop( void );

    34 void aica_run_slice( int );

    37 struct dreamcast_module aica_module = { "AICA", aica_init, aica_reset,

    38 					aica_start, aica_run_slice, aica_stop,

    39 					NULL, NULL, NULL };

    41 /**

    42  * Initialize the AICA subsystem. Note requires that

    43  */

    44 void aica_init( void )

    45 {

    46     register_io_regions( mmio_list_spu );

    47     MMIO_NOTRACE(AICA0);

    48     MMIO_NOTRACE(AICA1);

    49     arm_mem_init();

    50 }

    52 void aica_reset( void )

    53 {

    55 }

    57 void aica_start( void )

    58 {

    60 }

    62 void aica_run_slice( int microsecs )

    63 {

    64     /* Run arm instructions */

    65     /* Generate audio buffer */

    66 }

    68 void aica_stop( void )

    69 {

    71 }

    73 /** Channel register structure:

    74  * 00

    75  * 04

    76  * 08  4  Loop start address

    77  * 0C  4  Loop end address

    78  * 10  4  Volume envelope

    79  * 14

    80  * 18  4  Frequency (floating point

    81  * 1C

    82  * 20

    83  * 24  1  Pan

    84  * 25  1  ??

    85  * 26

    86  * 27

    87  * 28  1  ??

    88  * 29  1  Volume

    89  * 2C

    90  * 30

    91  *

    93 /* Write to channels 0-31 */

    94 void mmio_region_AICA0_write( uint32_t reg, uint32_t val )

    95 {

    96     //    aica_write_channel( reg >> 7, reg % 128, val );

    98 }

   100 /* Write to channels 32-64 */

   101 void mmio_region_AICA1_write( uint32_t reg, uint32_t val )

   102 {

   103     //    aica_write_channel( (reg >> 7) + 32, reg % 128, val );

   105 }

   107 /* General registers */

   108 void mmio_region_AICA2_write( uint32_t reg, uint32_t val )

   109 {

   111 }