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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. *
* *
***************************************************************************/
//*************************************************************************//
// History of changes:
//
// 2002/05/15 - Pete
// - generic cleanup for the Peops release
//
//*************************************************************************//
#include "../peops/stdafx.h"
#define _IN_DMA
extern uint32 psx_ram[(2*1024*1024)/4];
//#include "externals.h"
////////////////////////////////////////////////////////////////////////
// READ DMA (many values)
////////////////////////////////////////////////////////////////////////
void SPUreadDMAMem(u32 usPSXMem,int iSize)
{
int i;
u16 *ram16 = (u16 *)&psx_ram[0];
for(i=0;i<iSize;i++)
{
ram16[usPSXMem>>1]=spuMem[spuAddr>>1]; // spu addr got by writeregister
usPSXMem+=2;
spuAddr+=2; // inc spu addr
if(spuAddr>0x7ffff) 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 (many values)
////////////////////////////////////////////////////////////////////////
void SPUwriteDMAMem(u32 usPSXMem,int iSize)
{
int i;
u16 *ram16 = (u16 *)&psx_ram[0];
for(i=0;i<iSize;i++)
{
// printf("main RAM %x => SPU %x\n", usPSXMem, spuAddr);
spuMem[spuAddr>>1] = ram16[usPSXMem>>1];
usPSXMem+=2; // spu addr got by writeregister
spuAddr+=2; // inc spu addr
if(spuAddr>0x7ffff) spuAddr=0; // wrap
}
}
////////////////////////////////////////////////////////////////////////
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