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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"
////////////////////////////////////////////////////////////////////////
// READ DMA (one value)
////////////////////////////////////////////////////////////////////////
unsigned short CALLBACK SPUreadDMA(void)
{
unsigned short s=spu.spuMem[spu.spuAddr>>1];
spu.spuAddr+=2;
if(spu.spuAddr>0x7ffff) spu.spuAddr=0;
return s;
}
////////////////////////////////////////////////////////////////////////
// READ DMA (many values)
////////////////////////////////////////////////////////////////////////
void CALLBACK SPUreadDMAMem(unsigned short *pusPSXMem, int iSize,
unsigned int cycles)
{
int i;
do_samples_if_needed(cycles);
for(i=0;i<iSize;i++)
{
*pusPSXMem++=spu.spuMem[spu.spuAddr>>1]; // spu addr got by writeregister
spu.spuAddr+=2; // inc spu addr
if(spu.spuAddr>0x7ffff) spu.spuAddr=0; // wrap
}
}
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
// 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)
{
spu.spuMem[spu.spuAddr>>1] = val; // spu addr got by writeregister
spu.spuAddr+=2; // inc spu addr
if(spu.spuAddr>0x7ffff) spu.spuAddr=0; // wrap
}
////////////////////////////////////////////////////////////////////////
// WRITE DMA (many values)
////////////////////////////////////////////////////////////////////////
void CALLBACK SPUwriteDMAMem(unsigned short *pusPSXMem, int iSize,
unsigned int cycles)
{
int i;
do_samples_if_needed(cycles);
if(spu.spuAddr + iSize*2 < 0x80000)
{
memcpy(&spu.spuMem[spu.spuAddr>>1], pusPSXMem, iSize*2);
spu.spuAddr += iSize*2;
return;
}
for(i=0;i<iSize;i++)
{
spu.spuMem[spu.spuAddr>>1] = *pusPSXMem++; // spu addr got by writeregister
spu.spuAddr+=2; // inc spu addr
spu.spuAddr&=0x7ffff; // wrap
}
}
////////////////////////////////////////////////////////////////////////
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