121 lines
2.3 KiB
C++
121 lines
2.3 KiB
C++
/******************************************************************************/
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/* Mednafen Sony PS1 Emulation Module */
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/******************************************************************************/
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/* sio.cpp:
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** Copyright (C) 2011-2016 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "psx.h"
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#include "sio.h"
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namespace MDFN_IEN_PSX
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{
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// Dummy implementation.
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static uint16 Status;
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static uint16 Mode;
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static uint16 Control;
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static uint16 BaudRate;
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static uint32 DataBuffer;
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void SIO_Power(void)
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{
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Status = 0;
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Mode = 0;
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Control = 0;
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BaudRate = 0;
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DataBuffer = 0;
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}
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uint32 SIO_Read(pscpu_timestamp_t timestamp, uint32 A)
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{
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uint32 ret = 0;
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switch(A & 0xE)
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{
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default:
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PSX_WARNING("[SIO] Unknown read: 0x%08x -- %d\n", A, timestamp);
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break;
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case 0x0:
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//case 0x2:
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ret = DataBuffer >> ((A & 2) * 8);
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break;
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case 0x4:
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ret = Status;
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break;
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case 0x8:
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ret = Mode;
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break;
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case 0xA:
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ret = Control;
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break;
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case 0xE:
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ret = BaudRate;
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break;
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}
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return(ret >> ((A & 1) * 8));
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}
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void SIO_Write(pscpu_timestamp_t timestamp, uint32 A, uint32 V)
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{
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V <<= (A & 1) * 8;
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switch(A & 0xE)
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{
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default:
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PSX_WARNING("[SIO] Unknown write: 0x%08x 0x%08x -- %d\n", A, V, timestamp);
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break;
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case 0x0:
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//case 0x2:
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V <<= (A & 2) * 8;
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DataBuffer = V;
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break;
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case 0x8:
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Mode = V;
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break;
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case 0xA:
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Control = V;
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break;
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case 0xE:
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BaudRate = V;
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break;
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}
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}
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void SIO_SyncState(bool isReader, EW::NewState *ns)
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{
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NSS(Status);
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NSS(Mode);
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NSS(Control);
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NSS(BaudRate);
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NSS(DataBuffer);
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}
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}
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