/******************************************************************************* 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 #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() { memset(&rtc, 0, 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_t data, uint16_t 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; memset(rtc.data, 0, 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_t S9xGetSRTC(uint16_t 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 converted: Different mallocs [Neb] memcpy(&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 MSB_FIRST Memory.SRAM [s + 5 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 0); Memory.SRAM [s + 6 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 8); Memory.SRAM [s + 7 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 16); Memory.SRAM [s + 8 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 24); Memory.SRAM [s + 9 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 32); Memory.SRAM [s + 10 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 40); Memory.SRAM [s + 11 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 48); Memory.SRAM [s + 12 + MAX_RTC_INDEX] = (uint8_t)(rtc.system_timestamp >> 56); #else // memmove converted: Different mallocs [Neb] memcpy(&Memory.SRAM [s + 5 + MAX_RTC_INDEX], &rtc.system_timestamp, 8); #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 converted: Different mallocs [Neb] memcpy(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 MSB_FIRST 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); #else // memmove converted: Different mallocs [Neb] memcpy(&rtc.system_timestamp, &Memory.SRAM [s + 5 + MAX_RTC_INDEX], 8); #endif S9xUpdateSrtcTime(); } }