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-rw-r--r--NDSCart.cpp939
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diff --git a/NDSCart.cpp b/NDSCart.cpp
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-/*
- Copyright 2016-2017 StapleButter
-
- This file is part of melonDS.
-
- melonDS is free software: you can redistribute it and/or modify it under
- the terms of the GNU General Public License as published by the Free
- Software Foundation, either version 3 of the License, or (at your option)
- any later version.
-
- melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with melonDS. If not, see http://www.gnu.org/licenses/.
-*/
-
-#include <stdio.h>
-#include <string.h>
-#include "NDS.h"
-#include "NDSCart.h"
-
-
-namespace NDSCart_SRAM
-{
-
-u8* SRAM;
-u32 SRAMLength;
-
-char SRAMPath[256];
-
-void (*WriteFunc)(u8 val, bool islast);
-
-u32 Discover_MemoryType;
-u32 Discover_Likeliness;
-u8* Discover_Buffer;
-u32 Discover_DataPos;
-
-u32 Hold;
-u8 CurCmd;
-u32 DataPos;
-u8 Data;
-
-u8 StatusReg;
-u32 Addr;
-
-
-void Write_Null(u8 val, bool islast);
-void Write_EEPROMTiny(u8 val, bool islast);
-void Write_EEPROM(u8 val, bool islast);
-void Write_Flash(u8 val, bool islast);
-void Write_Discover(u8 val, bool islast);
-
-
-bool Init()
-{
- SRAM = NULL;
- Discover_Buffer = NULL;
- return true;
-}
-
-void DeInit()
-{
- if (SRAM) delete[] SRAM;
- if (Discover_Buffer) delete[] Discover_Buffer;
-}
-
-void Reset()
-{
-}
-
-void LoadSave(char* path)
-{
- if (SRAM) delete[] SRAM;
- if (Discover_Buffer) delete[] Discover_Buffer;
-
- Discover_Buffer = NULL;
-
- strncpy(SRAMPath, path, 255);
- SRAMPath[255] = '\0';
-
- FILE* f = fopen(path, "rb");
- if (f)
- {
- fseek(f, 0, SEEK_END);
- SRAMLength = (u32)ftell(f);
- SRAM = new u8[SRAMLength];
-
- fseek(f, 0, SEEK_SET);
- fread(SRAM, SRAMLength, 1, f);
-
- fclose(f);
-
- switch (SRAMLength)
- {
- case 512: WriteFunc = Write_EEPROMTiny; break;
- case 8192:
- case 65536: WriteFunc = Write_EEPROM; break;
- case 256*1024:
- case 512*1024:
- case 1024*1024:
- case 8192*1024: WriteFunc = Write_Flash; break;
- default:
- printf("!! BAD SAVE LENGTH %d\n", SRAMLength);
- WriteFunc = Write_Null;
- break;
- }
- }
- else
- {
- SRAMLength = 0;
- WriteFunc = Write_Discover;
- Discover_MemoryType = 2;
- Discover_Likeliness = 0;
-
- Discover_DataPos = 0;
- Discover_Buffer = new u8[256*1024];
- memset(Discover_Buffer, 0, 256*1024);
- }
-
- Hold = 0;
- CurCmd = 0;
- Data = 0;
- StatusReg = 0x00;
-}
-
-u8 Read()
-{
- return Data;
-}
-
-void SetMemoryType()
-{
- switch (Discover_MemoryType)
- {
- case 1:
- printf("Save memory type: EEPROM 4k\n");
- WriteFunc = Write_EEPROMTiny;
- SRAMLength = 512;
- break;
-
- case 2:
- printf("Save memory type: EEPROM 64k\n");
- WriteFunc = Write_EEPROM;
- SRAMLength = 8192;
- break;
-
- case 3:
- printf("Save memory type: EEPROM 512k\n");
- WriteFunc = Write_EEPROM;
- SRAMLength = 65536;
- break;
-
- case 4:
- printf("Save memory type: Flash. Hope the size is 256K.\n");
- WriteFunc = Write_Flash;
- SRAMLength = 256*1024;
- break;
-
- case 5:
- printf("Save memory type: ...something else\n");
- WriteFunc = Write_Null;
- SRAMLength = 0;
- break;
- }
-
- if (!SRAMLength)
- return;
-
- SRAM = new u8[SRAMLength];
-
- // replay writes that occured during discovery
- u8 prev_cmd = CurCmd;
- u32 pos = 0;
- while (pos < 256*1024)
- {
- u32 len = *(u32*)&Discover_Buffer[pos];
- pos += 4;
- if (len == 0) break;
-
- CurCmd = Discover_Buffer[pos++];
- DataPos = 0;
- Addr = 0;
- Data = 0;
- for (u32 i = 1; i < len; i++)
- {
- WriteFunc(Discover_Buffer[pos++], (i==(len-1)));
- DataPos++;
- }
- }
-
- CurCmd = prev_cmd;
-
- delete[] Discover_Buffer;
-}
-
-void Write_Discover(u8 val, bool islast)
-{
- // attempt at autodetecting the type of save memory.
- // we basically hope the game will be nice and clear whole pages of memory.
-
- if (CurCmd == 0x03 || CurCmd == 0x0B)
- {
- if (Discover_Likeliness)
- {
- // apply. and pray.
- SetMemoryType();
-
- DataPos = 0;
- Addr = 0;
- Data = 0;
- return WriteFunc(val, islast);
- }
- else
- {
- Data = 0;
- return;
- }
- }
-
- if (CurCmd == 0x02 || CurCmd == 0x0A)
- {
- if (DataPos == 0)
- Discover_Buffer[Discover_DataPos + 4] = CurCmd;
-
- Discover_Buffer[Discover_DataPos + 5 + DataPos] = val;
-
- if (islast)
- {
- u32 len = DataPos+1;
-
- *(u32*)&Discover_Buffer[Discover_DataPos] = len+1;
- Discover_DataPos += 5+len;
-
- if (Discover_Likeliness <= len)
- {
- Discover_Likeliness = len;
-
- if (len > 3+256) // bigger Flash, FRAM, whatever
- {
- Discover_MemoryType = 5;
- }
- else if (len > 2+128) // Flash
- {
- Discover_MemoryType = 4;
- }
- else if (len > 2+32) // EEPROM 512k
- {
- Discover_MemoryType = 3;
- }
- else if (len > 1+16 || (len != 1+16 && CurCmd != 0x0A)) // EEPROM 64k
- {
- Discover_MemoryType = 2;
- }
- else // EEPROM 4k
- {
- Discover_MemoryType = 1;
- }
- }
-
- printf("discover: type=%d likeliness=%d\n", Discover_MemoryType, Discover_Likeliness);
- }
- }
-}
-
-void Write_Null(u8 val, bool islast) {}
-
-void Write_EEPROMTiny(u8 val, bool islast)
-{
- // TODO
-}
-
-void Write_EEPROM(u8 val, bool islast)
-{
- switch (CurCmd)
- {
- case 0x02:
- if (DataPos < 2)
- {
- Addr <<= 8;
- Addr |= val;
- Data = 0;
- }
- else
- {
- SRAM[Addr & (SRAMLength-1)] = val;
- Addr++;
- }
- break;
-
- case 0x03:
- if (DataPos < 2)
- {
- Addr <<= 8;
- Addr |= val;
- Data = 0;
- }
- else
- {
- Data = SRAM[Addr & (SRAMLength-1)];
- Addr++;
- }
- break;
-
- case 0x9F:
- Data = 0xFF;
- break;
-
- default:
- if (DataPos==0)
- printf("unknown EEPROM save command %02X\n", CurCmd);
- break;
- }
-}
-
-void Write_Flash(u8 val, bool islast)
-{
- switch (CurCmd)
- {
- case 0x03:
- if (DataPos < 3)
- {
- Addr <<= 8;
- Addr |= val;
- Data = 0;
- }
- else
- {
- // CHECKME: does Flash also wraparound when the address is out of bounds?
- if (Addr >= SRAMLength)
- Data = 0;
- else
- Data = SRAM[Addr];
-
- Addr++;
- }
- break;
-
- case 0x0A:
- if (DataPos < 3)
- {
- Addr <<= 8;
- Addr |= val;
- Data = 0;
- }
- else
- {
- if (Addr < SRAMLength)
- SRAM[Addr] = val;
-
- Addr++;
- }
- break;
-
- case 0x9F:
- Data = 0xFF;
- break;
-
- default:
- if (DataPos==0)
- printf("unknown Flash save command %02X\n", CurCmd);
- break;
- }
-}
-
-void Write(u8 val, u32 hold)
-{
- bool islast = false;
-
- if (!hold)
- {
- if (Hold) islast = true;
- Hold = 0;
- }
-
- if (hold && (!Hold))
- {
- CurCmd = val;
- Hold = 1;
- Data = 0;
- DataPos = 0;
- Addr = 0;
- //printf("save SPI command %02X\n", CurCmd);
- return;
- }
-
- switch (CurCmd)
- {
- case 0x02:
- case 0x03:
- case 0x0A:
- case 0x0B:
- case 0x9F:
- WriteFunc(val, islast);
- DataPos++;
- break;
-
- case 0x04: // write disable
- StatusReg &= ~(1<<1);
- Data = 0;
- break;
-
- case 0x05: // read status reg
- Data = StatusReg;
- break;
-
- case 0x06: // write enable
- StatusReg |= (1<<1);
- Data = 0;
- break;
-
- default:
- if (DataPos==0)
- printf("unknown save SPI command %02X\n", CurCmd);
- break;
- }
-
- if (islast && (CurCmd == 0x02 || CurCmd == 0x0A))
- {
- FILE* f = fopen(SRAMPath, "wb");
- if (f)
- {
- fwrite(SRAM, SRAMLength, 1, f);
- fclose(f);
- }
- }
-}
-
-}
-
-
-namespace NDSCart
-{
-
-u16 SPICnt;
-u32 ROMCnt;
-
-u8 ROMCommand[8];
-u32 ROMDataOut;
-
-u8 DataOut[0x4000];
-u32 DataOutPos;
-u32 DataOutLen;
-
-bool CartInserted;
-u8* CartROM;
-u32 CartROMSize;
-u32 CartID;
-bool CartIsHomebrew;
-
-u32 CmdEncMode;
-u32 DataEncMode;
-
-u32 Key1_KeyBuf[0x412];
-
-u64 Key2_X;
-u64 Key2_Y;
-
-
-u32 ByteSwap(u32 val)
-{
- return (val >> 24) | ((val >> 8) & 0xFF00) | ((val << 8) & 0xFF0000) | (val << 24);
-}
-
-void Key1_Encrypt(u32* data)
-{
- u32 y = data[0];
- u32 x = data[1];
- u32 z;
-
- for (u32 i = 0x0; i <= 0xF; i++)
- {
- z = Key1_KeyBuf[i] ^ x;
- x = Key1_KeyBuf[0x012 + (z >> 24) ];
- x += Key1_KeyBuf[0x112 + ((z >> 16) & 0xFF)];
- x ^= Key1_KeyBuf[0x212 + ((z >> 8) & 0xFF)];
- x += Key1_KeyBuf[0x312 + (z & 0xFF)];
- x ^= y;
- y = z;
- }
-
- data[0] = x ^ Key1_KeyBuf[0x10];
- data[1] = y ^ Key1_KeyBuf[0x11];
-}
-
-void Key1_Decrypt(u32* data)
-{
- u32 y = data[0];
- u32 x = data[1];
- u32 z;
-
- for (u32 i = 0x11; i >= 0x2; i--)
- {
- z = Key1_KeyBuf[i] ^ x;
- x = Key1_KeyBuf[0x012 + (z >> 24) ];
- x += Key1_KeyBuf[0x112 + ((z >> 16) & 0xFF)];
- x ^= Key1_KeyBuf[0x212 + ((z >> 8) & 0xFF)];
- x += Key1_KeyBuf[0x312 + (z & 0xFF)];
- x ^= y;
- y = z;
- }
-
- data[0] = x ^ Key1_KeyBuf[0x1];
- data[1] = y ^ Key1_KeyBuf[0x0];
-}
-
-void Key1_ApplyKeycode(u32* keycode, u32 mod)
-{
- Key1_Encrypt(&keycode[1]);
- Key1_Encrypt(&keycode[0]);
-
- u32 temp[2] = {0,0};
-
- for (u32 i = 0; i <= 0x11; i++)
- {
- Key1_KeyBuf[i] ^= ByteSwap(keycode[i % mod]);
- }
- for (u32 i = 0; i <= 0x410; i+=2)
- {
- Key1_Encrypt(temp);
- Key1_KeyBuf[i ] = temp[1];
- Key1_KeyBuf[i+1] = temp[0];
- }
-}
-
-void Key1_InitKeycode(u32 idcode, u32 level, u32 mod)
-{
- memcpy(Key1_KeyBuf, &NDS::ARM7BIOS[0x30], 0x1048); // hax
-
- u32 keycode[3] = {idcode, idcode>>1, idcode<<1};
- if (level >= 1) Key1_ApplyKeycode(keycode, mod);
- if (level >= 2) Key1_ApplyKeycode(keycode, mod);
- if (level >= 3)
- {
- keycode[1] <<= 1;
- keycode[2] >>= 1;
- Key1_ApplyKeycode(keycode, mod);
- }
-}
-
-
-void Key2_Encrypt(u8* data, u32 len)
-{
- for (u32 i = 0; i < len; i++)
- {
- Key2_X = (((Key2_X >> 5) ^
- (Key2_X >> 17) ^
- (Key2_X >> 18) ^
- (Key2_X >> 31)) & 0xFF)
- + (Key2_X << 8);
- Key2_Y = (((Key2_Y >> 5) ^
- (Key2_Y >> 23) ^
- (Key2_Y >> 18) ^
- (Key2_Y >> 31)) & 0xFF)
- + (Key2_Y << 8);
-
- Key2_X &= 0x0000007FFFFFFFFFULL;
- Key2_Y &= 0x0000007FFFFFFFFFULL;
- }
-}
-
-
-bool Init()
-{
- if (!NDSCart_SRAM::Init()) return false;
-
- return true;
-}
-
-void DeInit()
-{
- NDSCart_SRAM::DeInit();
-}
-
-void Reset()
-{
- SPICnt = 0;
- ROMCnt = 0;
-
- memset(ROMCommand, 0, 8);
- ROMDataOut = 0;
-
- Key2_X = 0;
- Key2_Y = 0;
-
- memset(DataOut, 0, 0x4000);
- DataOutPos = 0;
- DataOutLen = 0;
-
- CartInserted = false;
- CartROM = NULL;
- CartROMSize = 0;
- CartID = 0;
- CartIsHomebrew = false;
-
- CmdEncMode = 0;
- DataEncMode = 0;
-
- NDSCart_SRAM::Reset();
-}
-
-
-bool LoadROM(char* path)
-{
- // TODO: streaming mode? for really big ROMs or systems with limited RAM
- // for now we're lazy
-
- FILE* f = fopen(path, "rb");
- if (!f)
- {
- printf("Failed to open ROM file %s\n", path);
- return false;
- }
-
- fseek(f, 0, SEEK_END);
- u32 len = (u32)ftell(f);
-
- CartROMSize = 0x200;
- while (CartROMSize < len)
- CartROMSize <<= 1;
-
- u32 gamecode;
- fseek(f, 0x0C, SEEK_SET);
- fread(&gamecode, 4, 1, f);
-
- CartROM = new u8[CartROMSize];
- memset(CartROM, 0, CartROMSize);
- fseek(f, 0, SEEK_SET);
- fread(CartROM, 1, len, f);
-
- fclose(f);
- //CartROM = f;
-
- // temp. TODO: later make this user selectable
- // calling this sets up shit for booting from the cart directly.
- // normal behavior is booting from the BIOS.
- NDS::SetupDirectBoot();
-
- CartInserted = true;
-
- // generate a ROM ID
- // note: most games don't check the actual value
- // it just has to stay the same throughout gameplay
- CartID = 0x00001FC2;
-
- u32 arm9base = *(u32*)&CartROM[0x20];
- if (arm9base < 0x8000)
- {
- if (arm9base >= 0x4000)
- {
- // reencrypt secure area if needed
- if (*(u32*)&CartROM[arm9base] == 0xE7FFDEFF)
- {
- printf("Re-encrypting cart secure area\n");
-
- strncpy((char*)&CartROM[arm9base], "encryObj", 8);
-
- Key1_InitKeycode(gamecode, 3, 2);
- for (u32 i = 0; i < 0x800; i += 8)
- Key1_Encrypt((u32*)&CartROM[arm9base + i]);
-
- Key1_InitKeycode(gamecode, 2, 2);
- Key1_Encrypt((u32*)&CartROM[arm9base]);
- }
- }
- else
- CartIsHomebrew = true;
- }
-
- // encryption
- Key1_InitKeycode(gamecode, 2, 2);
-
-
- // save
- char savepath[256];
- strncpy(savepath, path, 255);
- savepath[255] = '\0';
- strncpy(savepath + strlen(path) - 3, "sav", 3);
- printf("Save file: %s\n", savepath);
- NDSCart_SRAM::LoadSave(savepath);
-
- return true;
-}
-
-void ReadROM(u32 addr, u32 len, u32 offset)
-{
- if (!CartInserted) return;
-
- if (addr >= CartROMSize) return;
- if ((addr+len) > CartROMSize)
- len = CartROMSize - addr;
-
- memcpy(DataOut+offset, CartROM+addr, len);
-}
-
-void ReadROM_B7(u32 addr, u32 len, u32 offset)
-{
- addr &= (CartROMSize-1);
- if (!CartIsHomebrew)
- {
- if (addr < 0x8000)
- addr = 0x8000 + (addr & 0x1FF);
- }
-
- memcpy(DataOut+offset, CartROM+addr, len);
-}
-
-
-void EndTransfer()
-{
- ROMCnt &= ~(1<<23);
- ROMCnt &= ~(1<<31);
-
- if (SPICnt & (1<<14))
- NDS::SetIRQ((NDS::ExMemCnt[0]>>11)&0x1, NDS::IRQ_CartSendDone);
-}
-
-void ROMPrepareData(u32 param)
-{
- if (DataOutPos >= DataOutLen)
- ROMDataOut = 0;
- else
- ROMDataOut = *(u32*)&DataOut[DataOutPos];
-
- DataOutPos += 4;
-
- ROMCnt |= (1<<23);
- NDS::CheckDMAs(0, 0x06);
- NDS::CheckDMAs(1, 0x12);
-
- //if (DataOutPos < DataOutLen)
- // NDS::ScheduleEvent((ROMCnt & (1<<27)) ? 8:5, ROMPrepareData, 0);
-}
-
-void WriteROMCnt(u32 val)
-{
- ROMCnt = val & 0xFF7F7FFF;
-
- if (!(SPICnt & (1<<15))) return;
-
- if (val & (1<<15))
- {
- u32 snum = (NDS::ExMemCnt[0]>>8)&0x8;
- u64 seed0 = *(u32*)&NDS::ROMSeed0[snum] | ((u64)NDS::ROMSeed0[snum+4] << 32);
- u64 seed1 = *(u32*)&NDS::ROMSeed1[snum] | ((u64)NDS::ROMSeed1[snum+4] << 32);
-
- Key2_X = 0;
- Key2_Y = 0;
- for (u32 i = 0; i < 39; i++)
- {
- if (seed0 & (1ULL << i)) Key2_X |= (1ULL << (38-i));
- if (seed1 & (1ULL << i)) Key2_Y |= (1ULL << (38-i));
- }
-
- printf("seed0: %02X%08X\n", (u32)(seed0>>32), (u32)seed0);
- printf("seed1: %02X%08X\n", (u32)(seed1>>32), (u32)seed1);
- printf("key2 X: %02X%08X\n", (u32)(Key2_X>>32), (u32)Key2_X);
- printf("key2 Y: %02X%08X\n", (u32)(Key2_Y>>32), (u32)Key2_Y);
- }
-
- if (!(ROMCnt & (1<<31))) return;
-
- u32 datasize = (ROMCnt >> 24) & 0x7;
- if (datasize == 7)
- datasize = 4;
- else if (datasize > 0)
- datasize = 0x100 << datasize;
-
- DataOutPos = 0;
- DataOutLen = datasize;
-
- // handle KEY1 encryption as needed.
- // KEY2 encryption is implemented in hardware and doesn't need to be handled.
- u8 cmd[8];
- if (CmdEncMode == 1)
- {
- *(u32*)&cmd[0] = ByteSwap(*(u32*)&ROMCommand[4]);
- *(u32*)&cmd[4] = ByteSwap(*(u32*)&ROMCommand[0]);
- Key1_Decrypt((u32*)cmd);
- u32 tmp = ByteSwap(*(u32*)&cmd[4]);
- *(u32*)&cmd[4] = ByteSwap(*(u32*)&cmd[0]);
- *(u32*)&cmd[0] = tmp;
- }
- else
- {
- *(u32*)&cmd[0] = *(u32*)&ROMCommand[0];
- *(u32*)&cmd[4] = *(u32*)&ROMCommand[4];
- }
-
- /*printf("ROM COMMAND %04X %08X %02X%02X%02X%02X%02X%02X%02X%02X SIZE %04X\n",
- SPICnt, ROMCnt,
- cmd[0], cmd[1], cmd[2], cmd[3],
- cmd[4], cmd[5], cmd[6], cmd[7],
- datasize);*/
-
- switch (cmd[0])
- {
- case 0x9F:
- memset(DataOut, 0xFF, DataOutLen);
- break;
-
- case 0x00:
- memset(DataOut, 0, DataOutLen);
- if (DataOutLen > 0x1000)
- {
- ReadROM(0, 0x1000, 0);
- for (u32 pos = 0x1000; pos < DataOutLen; pos += 0x1000)
- memcpy(DataOut+pos, DataOut, 0x1000);
- }
- else
- ReadROM(0, DataOutLen, 0);
- break;
-
- case 0x90:
- case 0xB8:
- for (u32 pos = 0; pos < DataOutLen; pos += 4)
- *(u32*)&DataOut[pos] = CartID;
- break;
-
- case 0x3C:
- CmdEncMode = 1;
- break;
-
- case 0xB7:
- {
- u32 addr = (cmd[1]<<24) | (cmd[2]<<16) | (cmd[3]<<8) | cmd[4];
- memset(DataOut, 0, DataOutLen);
-
- if (((addr + DataOutLen - 1) >> 12) != (addr >> 12))
- {
- u32 len1 = 0x1000 - (addr & 0xFFF);
- ReadROM_B7(addr, len1, 0);
- ReadROM_B7(addr+len1, DataOutLen-len1, len1);
- }
- else
- ReadROM_B7(addr, DataOutLen, 0);
- }
- break;
-
- default:
- switch (cmd[0] & 0xF0)
- {
- case 0x40:
- DataEncMode = 2;
- break;
-
- case 0x10:
- for (u32 pos = 0; pos < DataOutLen; pos += 4)
- *(u32*)&DataOut[pos] = CartID;
- break;
-
- case 0x20:
- {
- u32 addr = (cmd[2] & 0xF0) << 8;
- ReadROM(addr, 0x1000, 0);
- }
- break;
-
- case 0xA0:
- CmdEncMode = 2;
- break;
- }
- break;
- }
-
- //ROMCnt &= ~(1<<23);
- ROMCnt |= (1<<23);
-
- if (datasize == 0)
- EndTransfer();
- else
- {
- NDS::CheckDMAs(0, 0x05);
- NDS::CheckDMAs(1, 0x12);
- }
- //NDS::ScheduleEvent((ROMCnt & (1<<27)) ? 8:5, ROMPrepareData, 0);
-}
-
-u32 ReadROMData()
-{
- /*if (ROMCnt & (1<<23))
- {
- ROMCnt &= ~(1<<23);
- if (DataOutPos >= DataOutLen)
- EndTransfer();
- }
-
- return ROMDataOut;*/
- u32 ret;
- if (DataOutPos >= DataOutLen)
- ret = 0;
- else
- ret = *(u32*)&DataOut[DataOutPos];
-
- DataOutPos += 4;
-
- if (DataOutPos == DataOutLen)
- EndTransfer();
-
- return ret;
-}
-
-void DMA(u32 addr)
-{
- void (*writefn)(u32,u32) = (NDS::ExMemCnt[0] & (1<<11)) ? NDS::ARM7Write32 : NDS::ARM9Write32;
- for (u32 i = 0; i < DataOutLen; i+=4)
- {
- writefn(addr+i, *(u32*)&DataOut[i]);
- }
-
- EndTransfer();
-}
-
-
-void WriteSPICnt(u16 val)
-{
- SPICnt = (SPICnt & 0x0080) | (val & 0xE043);
-}
-
-u8 ReadSPIData()
-{
- if (!(SPICnt & (1<<15))) return 0;
- if (!(SPICnt & (1<<13))) return 0;
-
- return NDSCart_SRAM::Read();
-}
-
-void WriteSPIData(u8 val)
-{
- if (!(SPICnt & (1<<15))) return;
- if (!(SPICnt & (1<<13))) return;
-
- // TODO: take delays into account
-
- NDSCart_SRAM::Write(val, SPICnt&(1<<6));
-}
-
-}