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snes9xgx/source/snes9x/srtc.cpp
dborth 785190f0b6 upgrade to snes9x 1.51
2008-09-10 05:57:37 +00:00

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/**********************************************************************************
Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
(c) Copyright 1996 - 2002 Gary Henderson (gary.henderson@ntlworld.com),
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 funkyass (funkyass@spam.shaw.ca),
Kris Bleakley (codeviolation@hotmail.com)
(c) Copyright 2002 - 2007 Brad Jorsch (anomie@users.sourceforge.net),
Nach (n-a-c-h@users.sourceforge.net),
zones (kasumitokoduck@yahoo.com)
(c) Copyright 2006 - 2007 nitsuja
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, HQ3x, HQ4x filters
(c) Copyright 2003 Maxim Stepin (maxim@hiend3d.com)
Win32 GUI code
(c) Copyright 2003 - 2006 blip,
funkyass,
Matthew Kendora,
Nach,
nitsuja
Mac OS GUI code
(c) Copyright 1998 - 2001 John Stiles
(c) Copyright 2001 - 2007 zones
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 <string.h>
#include "snes9x.h"
#include "srtc.h"
#include "memmap.h"
/*** The format of the rtc_data structure is:
Index Description Range (nibble)
----- -------------- ---------------------------------------
0 Seconds low 0-9
1 Seconds high 0-5
2 Minutes low 0-9
3 Minutes high 0-5
4 Hour low 0-9
5 Hour high 0-2
6 Day low 0-9
7 Day high 0-3
8 Month 1-C (0xC is December, 12th month)
9 Year ones 0-9
A Year tens 0-9
B Year High 9-B (9=19xx, A=20xx, B=21xx)
C Day of week 0-6 (0=Sunday, 1=Monday,...,6=Saturday)
***/
SRTC_DATA rtc;
static int month_keys[12] = { 1, 4, 4, 0, 2, 5, 0, 3, 6, 1, 4, 6 };
/*********************************************************************************************
*
* Note, if you are doing a save state for this game:
*
* On save:
*
* Call S9xUpdateSrtcTime and save the rtc data structure.
*
* On load:
*
* restore the rtc data structure
* rtc.system_timestamp = time (NULL);
*
*
*********************************************************************************************/
void S9xResetSRTC ()
{
rtc.index = -1;
rtc.mode = MODE_READ;
}
void S9xHardResetSRTC ()
{
ZeroMemory (&rtc, sizeof (rtc));
rtc.index = -1;
rtc.mode = MODE_READ;
rtc.count_enable = FALSE;
rtc.needs_init = TRUE;
// Get system timestamp
rtc.system_timestamp = time (NULL);
}
/**********************************************************************************************/
/* S9xSRTCComputeDayOfWeek() */
/* Return 0-6 for Sunday-Saturday */
/**********************************************************************************************/
unsigned int S9xSRTCComputeDayOfWeek ()
{
unsigned year = rtc.data[10]*10 + rtc.data[9];
unsigned month = rtc.data[8];
unsigned day = rtc.data[7]*10 + rtc.data[6];
unsigned day_of_week;
year += (rtc.data[11] - 9) * 100;
// Range check the month for valid array indicies
if ( month > 12 )
month = 1;
day_of_week = year + (year / 4) + month_keys[month-1] + day - 1;
if(( year % 4 == 0 ) && ( month <= 2 ) )
day_of_week--;
day_of_week %= 7;
return day_of_week;
}
/**********************************************************************************************/
/* S9xSRTCDaysInMonth() */
/* Return the number of days in a specific month for a certain year */
/**********************************************************************************************/
int S9xSRTCDaysInMmonth( int month, int year )
{
int mdays;
switch ( month )
{
case 2:
if ( ( year % 4 == 0 ) ) // DKJM2 only uses 199x - 22xx
mdays = 29;
else
mdays = 28;
break;
case 4:
case 6:
case 9:
case 11:
mdays = 30;
break;
default: // months 1,3,5,7,8,10,12
mdays = 31;
break;
}
return mdays;
}
#define DAYTICKS (60*60*24)
#define HOURTICKS (60*60)
#define MINUTETICKS 60
/**********************************************************************************************/
/* S9xUpdateSrtcTime() */
/* Advance the S-RTC time if counting is enabled */
/**********************************************************************************************/
void S9xUpdateSrtcTime ()
{
time_t cur_systime;
long time_diff;
// Keep track of game time by computing the number of seconds that pass on the system
// clock and adding the same number of seconds to the S-RTC clock structure.
// I originally tried using mktime and localtime library functions to keep track
// of time but some of the GNU time functions fail when the year goes to 2099
// (and maybe less) and this would have caused a bug with DKJM2 so I'm doing
// it this way to get around that problem.
// Note: Dai Kaijyu Monogatari II only allows dates in the range 1996-21xx.
if (rtc.count_enable && !rtc.needs_init)
{
cur_systime = time (NULL);
// This method assumes one time_t clock tick is one second
// which should work on PCs and GNU systems.
// If your tick interval is different adjust the
// DAYTICK, HOURTICK, and MINUTETICK defines
time_diff = (long) (cur_systime - rtc.system_timestamp);
rtc.system_timestamp = cur_systime;
if ( time_diff > 0 )
{
int seconds;
int minutes;
int hours;
int days;
int month;
int year;
int temp_days;
int year_hundreds;
int year_tens;
int year_ones;
if ( time_diff > DAYTICKS )
{
days = time_diff / DAYTICKS;
time_diff = time_diff - days * DAYTICKS;
}
else
{
days = 0;
}
if ( time_diff > HOURTICKS )
{
hours = time_diff / HOURTICKS;
time_diff = time_diff - hours * HOURTICKS;
}
else
{
hours = 0;
}
if ( time_diff > MINUTETICKS )
{
minutes = time_diff / MINUTETICKS;
time_diff = time_diff - minutes * MINUTETICKS;
}
else
{
minutes = 0;
}
if ( time_diff > 0 )
{
seconds = time_diff;
}
else
{
seconds = 0;
}
seconds += (rtc.data[1]*10 + rtc.data[0]);
if ( seconds >= 60 )
{
seconds -= 60;
minutes += 1;
}
minutes += (rtc.data[3]*10 + rtc.data[2]);
if ( minutes >= 60 )
{
minutes -= 60;
hours += 1;
}
hours += (rtc.data[5]*10 + rtc.data[4]);
if ( hours >= 24 )
{
hours -= 24;
days += 1;
}
if ( days > 0 )
{
year = rtc.data[10]*10 + rtc.data[9];
year += ( 1000 + rtc.data[11] * 100 );
month = rtc.data[8];
days += (rtc.data[7]*10 + rtc.data[6]);
while ( days > (temp_days = S9xSRTCDaysInMmonth( month, year )) )
{
days -= temp_days;
month += 1;
if ( month > 12 )
{
year += 1;
month = 1;
}
}
year_tens = year % 100;
year_ones = year_tens % 10;
year_tens /= 10;
year_hundreds = (year - 1000) / 100;
rtc.data[6] = days % 10;
rtc.data[7] = days / 10;
rtc.data[8] = month;
rtc.data[9] = year_ones;
rtc.data[10] = year_tens;
rtc.data[11] = year_hundreds;
rtc.data[12] = S9xSRTCComputeDayOfWeek ();
}
rtc.data[0] = seconds % 10;
rtc.data[1] = seconds / 10;
rtc.data[2] = minutes % 10;
rtc.data[3] = minutes / 10;
rtc.data[4] = hours % 10;
rtc.data[5] = hours / 10;
return;
}
}
}
/**********************************************************************************************/
/* S9xSetSRTC() */
/* This function sends data to the S-RTC used in Dai Kaijyu Monogatari II */
/**********************************************************************************************/
void S9xSetSRTC (uint8 data, uint16 Address)
{
data &= 0x0F; // Data is only 4-bits, mask out unused bits.
if( data >= 0xD )
{
// It's an RTC command
switch ( data )
{
case 0xD:
rtc.mode = MODE_READ;
rtc.index = -1;
break;
case 0xE:
rtc.mode = MODE_COMMAND;
break;
default:
// Ignore the write if it's an 0xF ???
// Probably should switch back to read mode -- but this
// sequence never occurs in DKJM2
break;
}
return;
}
if ( rtc.mode == MODE_LOAD_RTC )
{
if ( (rtc.index >= 0) && (rtc.index < MAX_RTC_INDEX) )
{
rtc.data[rtc.index++] = data;
if ( rtc.index == MAX_RTC_INDEX )
{
// We have all the data for the RTC load
rtc.system_timestamp = time (NULL); // Get local system time
// Get the day of the week
rtc.data[rtc.index++] = S9xSRTCComputeDayOfWeek ();
// Start RTC counting again
rtc.count_enable = TRUE;
rtc.needs_init = FALSE;
}
return;
}
else
{
// Attempting to write too much data
// error(); // ignore??
}
}
else if ( rtc.mode == MODE_COMMAND )
{
switch( data )
{
case COMMAND_CLEAR_RTC:
// Disable RTC counter
rtc.count_enable = FALSE;
ZeroMemory (rtc.data, MAX_RTC_INDEX+1);
rtc.index = -1;
rtc.mode = MODE_COMMAND_DONE;
break;
case COMMAND_LOAD_RTC:
// Disable RTC counter
rtc.count_enable = FALSE;
rtc.index = 0; // Setup for writing
rtc.mode = MODE_LOAD_RTC;
break;
default:
rtc.mode = MODE_COMMAND_DONE;
// unrecognized command - need to implement.
}
return;
}
else
{
if ( rtc.mode == MODE_READ )
{
// Attempting to write while in read mode. Ignore.
}
if ( rtc.mode == MODE_COMMAND_DONE )
{
// Maybe this isn't an error. Maybe we should kick off
// a new E command. But is this valid?
}
}
}
/**********************************************************************************************/
/* S9xGetSRTC() */
/* This function retrieves data from the S-RTC */
/**********************************************************************************************/
uint8 S9xGetSRTC (uint16 Address)
{
if ( rtc.mode == MODE_READ )
{
if ( rtc.index < 0 )
{
S9xUpdateSrtcTime (); // Only update it if the game reads it
rtc.index++;
return ( 0x0f ); // Send start marker.
}
else if (rtc.index > MAX_RTC_INDEX)
{
rtc.index = -1; // Setup for next set of reads
return ( 0x0f ); // Data done marker.
}
else
{
// Feed out the data
return rtc.data[rtc.index++];
}
}
else
{
return 0x0;
}
}
void S9xSRTCPreSaveState ()
{
if (Settings.SRTC)
{
S9xUpdateSrtcTime ();
int s = Memory.SRAMSize ?
(1 << (Memory.SRAMSize + 3)) * 128 : 0;
if (s > 0x20000)
s = 0x20000;
Memory.SRAM [s + 0] = rtc.needs_init;
Memory.SRAM [s + 1] = rtc.count_enable;
memmove (&Memory.SRAM [s + 2], rtc.data, MAX_RTC_INDEX + 1);
Memory.SRAM [s + 3 + MAX_RTC_INDEX] = rtc.index;
Memory.SRAM [s + 4 + MAX_RTC_INDEX] = rtc.mode;
#ifdef LSB_FIRST
memmove (&Memory.SRAM [s + 5 + MAX_RTC_INDEX], &rtc.system_timestamp, 8);
#else
Memory.SRAM [s + 5 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 0);
Memory.SRAM [s + 6 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 8);
Memory.SRAM [s + 7 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 16);
Memory.SRAM [s + 8 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 24);
Memory.SRAM [s + 9 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 32);
Memory.SRAM [s + 10 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 40);
Memory.SRAM [s + 11 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 48);
Memory.SRAM [s + 12 + MAX_RTC_INDEX] = (uint8) (rtc.system_timestamp >> 56);
#endif
}
}
void S9xSRTCPostLoadState ()
{
if (Settings.SRTC)
{
int s = Memory.SRAMSize ?
(1 << (Memory.SRAMSize + 3)) * 128 : 0;
if (s > 0x20000)
s = 0x20000;
rtc.needs_init = Memory.SRAM [s + 0];
rtc.count_enable = Memory.SRAM [s + 1];
memmove (rtc.data, &Memory.SRAM [s + 2], MAX_RTC_INDEX + 1);
rtc.index = Memory.SRAM [s + 3 + MAX_RTC_INDEX];
rtc.mode = Memory.SRAM [s + 4 + MAX_RTC_INDEX];
#ifdef LSB_FIRST
memmove (&rtc.system_timestamp, &Memory.SRAM [s + 5 + MAX_RTC_INDEX], 8);
#else
rtc.system_timestamp |= (Memory.SRAM [s + 5 + MAX_RTC_INDEX] << 0);
rtc.system_timestamp |= (Memory.SRAM [s + 6 + MAX_RTC_INDEX] << 8);
rtc.system_timestamp |= (Memory.SRAM [s + 7 + MAX_RTC_INDEX] << 16);
rtc.system_timestamp |= (Memory.SRAM [s + 8 + MAX_RTC_INDEX] << 24);
rtc.system_timestamp |= (Memory.SRAM [s + 9 + MAX_RTC_INDEX] << 32);
rtc.system_timestamp |= (Memory.SRAM [s + 10 + MAX_RTC_INDEX] << 40);
rtc.system_timestamp |= (Memory.SRAM [s + 11 + MAX_RTC_INDEX] << 48);
rtc.system_timestamp |= (Memory.SRAM [s + 12 + MAX_RTC_INDEX] << 56);
#endif
S9xUpdateSrtcTime ();
}
}
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