80 lines
3 KiB
C
80 lines
3 KiB
C
/***************************************************************************
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dma.c - description
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-------------------
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begin : Wed May 15 2002
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copyright : (C) 2002 by Pete Bernert
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email : BlackDove@addcom.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. See also the license.txt file for *
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* additional informations. *
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* *
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***************************************************************************/
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//*************************************************************************//
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// History of changes:
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//
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// 2002/05/15 - Pete
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// - generic cleanup for the Peops release
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//
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//*************************************************************************//
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#include "../peops/stdafx.h"
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#define _IN_DMA
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extern uint32 psx_ram[(2*1024*1024)/4];
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//#include "externals.h"
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////////////////////////////////////////////////////////////////////////
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// READ DMA (many values)
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////////////////////////////////////////////////////////////////////////
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void SPUreadDMAMem(u32 usPSXMem,int iSize)
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{
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int i;
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u16 *ram16 = (u16 *)&psx_ram[0];
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for(i=0;i<iSize;i++)
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{
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ram16[usPSXMem>>1]=spuMem[spuAddr>>1]; // spu addr got by writeregister
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usPSXMem+=2;
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spuAddr+=2; // inc spu addr
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if(spuAddr>0x7ffff) spuAddr=0; // wrap
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}
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}
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////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////
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// to investigate: do sound data updates by writedma affect spu
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// irqs? Will an irq be triggered, if new data is written to
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// the memory irq address?
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////////////////////////////////////////////////////////////////////////
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// WRITE DMA (many values)
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////////////////////////////////////////////////////////////////////////
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void SPUwriteDMAMem(u32 usPSXMem,int iSize)
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{
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int i;
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u16 *ram16 = (u16 *)&psx_ram[0];
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for(i=0;i<iSize;i++)
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{
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// printf("main RAM %x => SPU %x\n", usPSXMem, spuAddr);
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spuMem[spuAddr>>1] = ram16[usPSXMem>>1];
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usPSXMem+=2; // spu addr got by writeregister
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spuAddr+=2; // inc spu addr
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if(spuAddr>0x7ffff) spuAddr=0; // wrap
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}
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}
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////////////////////////////////////////////////////////////////////////
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