start moving everything to C

1 files changed, 254 insertions, 0 deletions

diff --git a/source/seta018.c b/source/seta018.c
new file mode 100644
index 0000000..cafca06
--- /dev/null
+++ b/source/seta018.c
@@ -0,0 +1,254 @@
+/*******************************************************************************
+  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;
+		}
+	}
+}
+}
+