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/***************************************************************************
dma.c - description
-------------------
begin : Wed May 15 2002
copyright : (C) 2002 by Pete Bernert
email : BlackDove@addcom.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. See also the license.txt file for *
* additional informations. *
* *
***************************************************************************/
#include "stdafx.h"
#define _IN_DMA
#include "externals.h"
#include "registers.h"
////////////////////////////////////////////////////////////////////////
// READ DMA (one value)
////////////////////////////////////////////////////////////////////////
unsigned short CALLBACK SPUreadDMA(void)
{
unsigned short s=spuMem[spuAddr>>1];
spuAddr+=2;
if(spuAddr>0x7ffff) spuAddr=0;
iSpuAsyncWait=0;
return s;
}
////////////////////////////////////////////////////////////////////////
// READ DMA (many values)
////////////////////////////////////////////////////////////////////////
void CALLBACK SPUreadDMAMem(unsigned short * pusPSXMem,int iSize)
{
int i;
unsigned char crc=0;
spuStat |= STAT_DATA_BUSY;
for(i=0;i<iSize;i++)
{
Check_IRQ( spuAddr, 0 );
crc|=*pusPSXMem++=spuMem[spuAddr>>1]; // spu addr got by writeregister
spuAddr+=2; // inc spu addr
spuMem[spuAddr>>1];
// guess based on Vib Ribbon (below)
if(spuAddr>0x7ffff) break;
}
iSpuAsyncWait=0;
/*
/* Toshiden Subaru "story screen" hack.
/*
/* After character selection screen, the game checks values inside returned
/* SPU buffer and all values cannot be 0x0.
/* Due to XA timings(?) we return buffer that has only NULLs.
/* Setting little lag to MixXA() causes buffer to have some non-NULL values,
/* but causes garbage sound so this hack is preferable.
/*
/* Note: When messing with xa.c like fixing Suikoden II's demo video sound issue
/* this should be handled as well.
*/
if (crc == 0) *--pusPSXMem=0xFF;
spuStat &= ~STAT_DATA_BUSY;
spuStat &= ~STAT_DMA_NON;
spuStat &= ~STAT_DMA_W;
spuStat |= STAT_DMA_R;
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// to investigate: do sound data updates by writedma affect spu
// irqs? Will an irq be triggered, if new data is written to
// the memory irq address?
////////////////////////////////////////////////////////////////////////
// WRITE DMA (one value)
////////////////////////////////////////////////////////////////////////
void CALLBACK SPUwriteDMA(unsigned short val)
{
spuMem[spuAddr>>1] = val; // spu addr got by writeregister
spuAddr+=2; // inc spu addr
if(spuAddr>0x7ffff) spuAddr=0; // wrap
iSpuAsyncWait=0;
}
////////////////////////////////////////////////////////////////////////
// WRITE DMA (many values)
////////////////////////////////////////////////////////////////////////
void CALLBACK SPUwriteDMAMem(unsigned short * pusPSXMem,int iSize)
{
int i;
spuStat |= STAT_DATA_BUSY;
for(i=0;i<iSize;i++)
{
Check_IRQ( spuAddr, 0 );
spuMem[spuAddr>>1] = *pusPSXMem++; // spu addr got by writeregister
spuAddr+=2; // inc spu addr
// Vib Ribbon - stop transfer (reverb playback)
if(spuAddr>0x7ffff) break;
}
iSpuAsyncWait=0;
spuStat &= ~STAT_DATA_BUSY;
spuStat &= ~STAT_DMA_NON;
spuStat &= ~STAT_DMA_R;
spuStat |= STAT_DMA_W;
}
////////////////////////////////////////////////////////////////////////
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