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CATSFC/source/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 2001 - 2004 John Weidman (jweidman@slip.net)
(c) Copyright 2002 - 2004 Brad Jorsch (anomie@users.sourceforge.net),
funkyass (funkyass@spam.shaw.ca),
Joel Yliluoma (http://iki.fi/bisqwit/)
Kris Bleakley (codeviolation@hotmail.com),
Matthew Kendora,
Nach (n-a-c-h@users.sourceforge.net),
Peter Bortas (peter@bortas.org) and
zones (kasumitokoduck@yahoo.com)
C4 x86 assembler and some C emulation code
(c) Copyright 2000 - 2003 zsKnight (zsknight@zsnes.com),
_Demo_ (_demo_@zsnes.com), and Nach
C4 C++ code
(c) Copyright 2003 Brad Jorsch
DSP-1 emulator code
(c) Copyright 1998 - 2004 Ivar (ivar@snes9x.com), _Demo_, Gary Henderson,
John Weidman, neviksti (neviksti@hotmail.com),
Kris Bleakley, Andreas Naive
DSP-2 emulator code
(c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
Lord Nightmare (lord_nightmare@users.sourceforge.net
OBC1 emulator code
(c) Copyright 2001 - 2004 zsKnight, pagefault (pagefault@zsnes.com) and
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, and Dark Force
S-DD1 C emulator code
(c) Copyright 2003 Brad Jorsch with research by
Andreas Naive and John Weidman
S-RTC C emulator code
(c) Copyright 2001 John Weidman
ST010 C++ emulator code
(c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora
Super FX x86 assembler emulator code
(c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault
Super FX C emulator code
(c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman
SH assembler code partly based on x86 assembler code
(c) Copyright 2002 - 2004 Marcus Comstedt (marcus@mc.pp.se)
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 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.
Snes9x is freeware for PERSONAL USE only. Commercial users should
seek permission of the copyright holders first. Commercial use includes
charging money for Snes9x or software derived from Snes9x.
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; // Initialise to some value for the compiler
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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