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https://github.com/libretro/beetle-pce-fast-libretro.git
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107 lines
1.9 KiB
C++
107 lines
1.9 KiB
C++
/* Mednafen - Multi-system Emulator
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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.
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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
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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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}
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