boards/transformer.c

   1 /* FCE Ultra - NES/Famicom Emulator\r
   2  *\r
   3  * Copyright notice for this file:\r
   4  *  Copyright (C) 2009 CaH4e3\r
   5  *\r
   6  * This program is free software; you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation; either version 2 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * This program is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with this program; if not, write to the Free Software\r
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
  19  */\r
  20 \r
  21 #include "mapinc.h"\r
  22 \r
  23 static uint8 *WRAM=NULL;\r
  24 static uint32 WRAMSIZE;\r
  25 \r
  26 char *GetKeyboard(void);\r
  27 \r
  28 static char *TransformerKeys, oldkeys[256];\r
  29 static int TransformerCycleCount, TransformerChar = 0;\r
  30 \r
  31 static void FP_FASTAPASS(1) TransformerIRQHook(int a)\r
  32 {\r
  33  TransformerCycleCount+=a;\r
  34  if(TransformerCycleCount >= 1000)\r
  35  {\r
  36    uint32 i;\r
  37    TransformerCycleCount -= 1000;\r
  38    TransformerKeys = GetKeyboard();\r
  39   \r
  40    for(i=0; i<256; i++) {\r
  41      if(oldkeys[i] != TransformerKeys[i]) {\r
  42        if(oldkeys[i] == 0)\r
  43          TransformerChar = i;\r
  44        else\r
  45          TransformerChar = i | 0x80;\r
  46        X6502_IRQBegin(FCEU_IQEXT);\r
  47        memcpy((void *)&oldkeys[0], (void *)TransformerKeys, 256);\r
  48        break;\r
  49      }\r
  50    }\r
  51  }\r
  52 }\r
  53 \r
  54 static DECLFR(TransformerRead)\r
  55 {\r
  56   uint8 ret = 0;\r
  57   switch(A&3) {\r
  58     case 0: ret = TransformerChar & 15; break;\r
  59     case 1: ret = (TransformerChar >> 4); break;\r
  60     case 2: break;\r
  61     case 4: break;\r
  62   }\r
  63   X6502_IRQEnd(FCEU_IQEXT);\r
  64   return ret;\r
  65 }\r
  66 \r
  67 static void TransformerPower(void)\r
  68 {\r
  69   setprg8r(0x10,0x6000,0);\r
  70   setprg16(0x8000,0);\r
  71   setprg16(0xC000,~0);\r
  72   setchr8(0);\r
  73 \r
  74   SetReadHandler(0x5000,0x5004,TransformerRead);\r
  75   SetReadHandler(0x6000,0x7FFF,CartBR);\r
  76   SetWriteHandler(0x6000,0x7FFF,CartBW);\r
  77   SetReadHandler(0x8000,0xFFFF,CartBR);\r
  78 \r
  79   MapIRQHook=TransformerIRQHook;\r
  80 }\r
  81 \r
  82 static void TransformerClose(void)\r
  83 {\r
  84   if(WRAM)\r
  85     FCEU_gfree(WRAM);\r
  86   WRAM=NULL;\r
  87 }\r
  88 \r
  89 void Transformer_Init(CartInfo *info)\r
  90 {\r
  91   info->Power=TransformerPower;\r
  92   info->Close=TransformerClose;\r
  93 \r
  94   WRAMSIZE=8192;\r
  95   WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
  96   SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
  97   if(info->battery)\r
  98   {\r
  99     info->SaveGame[0]=WRAM;\r
 100     info->SaveGameLen[0]=WRAMSIZE;\r
 101   }\r
 102   AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
 103 }\r