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snes9xgx/source/snes9x/seta018.cpp

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/**********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com) and
Jerremy Koot (jkoot@snes9x.com)
(c) Copyright 2002 - 2004 Matthew Kendora
(c) Copyright 2002 - 2005 Peter Bortas (peter@bortas.org)
(c) Copyright 2004 - 2005 Joel Yliluoma (http://iki.fi/bisqwit/)
(c) Copyright 2001 - 2006 John Weidman (jweidman@slip.net)
(c) Copyright 2002 - 2006 Brad Jorsch (anomie@users.sourceforge.net),
funkyass (funkyass@spam.shaw.ca),
Kris Bleakley (codeviolation@hotmail.com),
Nach (n-a-c-h@users.sourceforge.net), and
zones (kasumitokoduck@yahoo.com)
BS-X C emulator code
(c) Copyright 2005 - 2006 Dreamer Nom,
zones
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 _Demo_ (_demo_@zsnes.com),
Nach,
zsKnight (zsknight@zsnes.com)
C4 C++ code
(c) Copyright 2003 - 2006 Brad Jorsch,
Nach
DSP-1 emulator code
(c) Copyright 1998 - 2006 _Demo_,
Andreas Naive (andreasnaive@gmail.com)
Gary Henderson,
Ivar (ivar@snes9x.com),
John Weidman,
Kris Bleakley,
Matthew Kendora,
Nach,
neviksti (neviksti@hotmail.com)
DSP-2 emulator code
(c) Copyright 2003 John Weidman,
Kris Bleakley,
Lord Nightmare (lord_nightmare@users.sourceforge.net),
Matthew Kendora,
neviksti
DSP-3 emulator code
(c) Copyright 2003 - 2006 John Weidman,
Kris Bleakley,
Lancer,
z80 gaiden
DSP-4 emulator code
(c) Copyright 2004 - 2006 Dreamer Nom,
John Weidman,
Kris Bleakley,
Nach,
z80 gaiden
OBC1 emulator code
(c) Copyright 2001 - 2004 zsKnight,
pagefault (pagefault@zsnes.com),
Kris Bleakley,
Ported from x86 assembler to C by sanmaiwashi
SPC7110 and RTC C++ emulator code
(c) Copyright 2002 Matthew Kendora with research by
zsKnight,
John Weidman,
Dark Force
S-DD1 C emulator code
(c) Copyright 2003 Brad Jorsch with research by
Andreas Naive,
John Weidman
S-RTC C emulator code
(c) Copyright 2001-2006 byuu,
John Weidman
ST010 C++ emulator code
(c) Copyright 2003 Feather,
John Weidman,
Kris Bleakley,
Matthew Kendora
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 _Demo_,
pagefault,
zsKnight,
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar,
Gary Henderson,
John Weidman
Sound DSP emulator code is derived from SNEeSe and OpenSPC:
(c) Copyright 1998 - 2003 Brad Martin
(c) Copyright 1998 - 2006 Charles Bilyue'
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
2xSaI filter
(c) Copyright 1999 - 2001 Derek Liauw Kie Fa
HQ2x filter
(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
Specific ports contains the works of other authors. See headers in
individual files.
Snes9x homepage: http://www.snes9x.com
Permission to use, copy, modify and/or distribute Snes9x in both binary
and source form, for non-commercial purposes, is hereby granted without
fee, providing that this license information and copyright notice appear
with all copies and any derived work.
This software is provided 'as-is', without any express or implied
warranty. In no event shall the authors be held liable for any damages
arising from the use of this software or it's derivatives.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes,
but is not limited to, charging money for Snes9x or software derived from
Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
using Snes9x as a promotion for your commercial product.
The copyright holders request that bug fixes and improvements to the code
should be forwarded to them so everyone can benefit from the modifications
in future versions.
Super NES and Super Nintendo Entertainment System are trademarks of
Nintendo Co., Limited and its subsidiary companies.
**********************************************************************************/
#include "seta.h"
#include "memmap.h"
ST018_Regs ST018;
static int line; // line counter
extern "C"{
uint8 S9xGetST018(uint32 Address)
{
uint8 t = 0;
uint16 address = (uint16) Address & 0xFFFF;
line++;
// these roles may be flipped
// op output
if (address == 0x3804)
{
if (ST018.out_count)
{
t = (uint8) ST018.output [ST018.out_index];
ST018.out_index++;
if (ST018.out_count==ST018.out_index)
ST018.out_count=0;
}
else
t = 0x81;
}
// status register
else if (address == 0x3800)
t = ST018.status;
printf( "ST018 R: %06X %02X\n", Address, t);
return t;
}
void S9xSetST018(uint8 Byte, uint32 Address)
{
uint16 address = (uint16) Address&0xFFFF;
static bool reset = false;
printf( "ST018 W: %06X %02X\n", Address, Byte );
line++;
if (!reset)
{
// bootup values
ST018.waiting4command = true;
ST018.part_command = 0;
reset = true;
}
Memory.SRAM[address]=Byte;
// default status for now
ST018.status = 0x00;
// op data goes through this address
if (address==0x3804)
{
// check for new commands: 3 bytes length
if(ST018.waiting4command && ST018.part_command==2)
{
ST018.waiting4command = false;
ST018.command <<= 8;
ST018.command |= Byte;
ST018.in_index = 0;
ST018.out_index = 0;
ST018.part_command = 0; // 3-byte commands
ST018.pass = 0; // data streams into the chip
switch(ST018.command & 0xFFFFFF)
{
case 0x0100: ST018.in_count = 0; break;
case 0xFF00: ST018.in_count = 0; break;
default: ST018.waiting4command = true; break;
}
}
else if(ST018.waiting4command)
{
// 3-byte commands
ST018.part_command++;
ST018.command <<= 8;
ST018.command |= Byte;
}
}
// extra parameters
else if (address==0x3802)
{
ST018.parameters[ST018.in_index] = Byte;
ST018.in_index++;
}
if (ST018.in_count==ST018.in_index)
{
// Actually execute the command
ST018.waiting4command = true;
ST018.in_index = 0;
ST018.out_index = 0;
switch (ST018.command)
{
// hardware check?
case 0x0100:
ST018.waiting4command = false;
ST018.pass++;
if (ST018.pass==1)
{
ST018.in_count = 1;
ST018.out_count = 2;
// Overload's research
ST018.output[0x00] = 0x81;
ST018.output[0x01] = 0x81;
}
else
{
//ST018.in_count = 1;
ST018.out_count = 3;
// no reason to change this
//ST018.output[0x00] = 0x81;
//ST018.output[0x01] = 0x81;
ST018.output[0x02] = 0x81;
// done processing requests
if (ST018.pass==3)
ST018.waiting4command = true;
}
break;
// unknown: feels like a security detection
// format identical to 0x0100
case 0xFF00:
ST018.waiting4command = false;
ST018.pass++;
if (ST018.pass==1)
{
ST018.in_count = 1;
ST018.out_count = 2;
// Overload's research
ST018.output[0x00] = 0x81;
ST018.output[0x01] = 0x81;
}
else
{
//ST018.in_count = 1;
ST018.out_count = 3;
// no reason to change this
//ST018.output[0x00] = 0x81;
//ST018.output[0x01] = 0x81;
ST018.output[0x02] = 0x81;
// done processing requests
if (ST018.pass==3)
ST018.waiting4command = true;
}
break;
}
}
}
}
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