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better save support. not hardcoded filename, support for non-tiny EEPROM and Flash, attempt at autodetecting the right memory type.

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This commit is contained in:
StapleButter
2017-02-03 16:57:31 +01:00
parent 7e9972e037
commit f4335b9292
6 changed files with 342 additions and 56 deletions
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344
NDSCart.cpp
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@ -28,7 +28,14 @@ namespace NDSCart_SRAM
u8* SRAM;
u32 SRAMLength;
u32 AddrLength;
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;
@ -39,16 +46,31 @@ 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);
void Init()
{
SRAM = NULL;
}
void Reset()
{
//
}
void LoadSave(char* path)
{
if (SRAM) delete[] SRAM;
FILE* f = fopen("rom/nsmb.sav", "rb"); // TODO: NOT HARDCODE THE FILENAME!!!
strncpy(SRAMPath, path, 255);
SRAMPath[255] = '\0';
FILE* f = fopen(path, "rb");
if (f)
{
fseek(f, 0, SEEK_END);
@ -62,17 +84,29 @@ void Reset()
switch (SRAMLength)
{
case 8192: AddrLength = 2; break;
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);
AddrLength = 2;
WriteFunc = Write_Null;
break;
}
}
else
{
// TODO: autodetect save type
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;
@ -86,10 +120,250 @@ 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;
}
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
{
if (Addr < SRAMLength)
SRAM[Addr] = val;
Addr++;
}
break;
case 0x03:
if (DataPos < 2)
{
Addr <<= 8;
Addr |= val;
Data = 0;
}
else
{
if (Addr >= SRAMLength)
Data = 0;
else
Data = SRAM[Addr];
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
{
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;
}
@ -98,7 +372,7 @@ void Write(u8 val, u32 hold)
CurCmd = val;
Hold = 1;
Data = 0;
DataPos = 1;
DataPos = 0;
Addr = 0;
//printf("save SPI command %02X\n", CurCmd);
return;
@ -106,28 +380,13 @@ void Write(u8 val, u32 hold)
switch (CurCmd)
{
case 0x03: // read
{
if (DataPos < AddrLength+1)
{
Addr <<= 8;
Addr |= val;
Data = 0;
//if (DataPos == AddrLength) printf("save SPI read %08X\n", Addr);
}
else
{
if (Addr >= SRAMLength)
Data = 0;
else
Data = SRAM[Addr];
Addr++;
}
DataPos++;
}
case 0x02:
case 0x03:
case 0x0A:
case 0x0B:
case 0x9F:
WriteFunc(val, islast);
DataPos++;
break;
case 0x04: // write disable
@ -144,14 +403,21 @@ void Write(u8 val, u32 hold)
Data = 0;
break;
case 0x9F: // read JEDEC ID
Data = 0xFF;
break;
default:
printf("unknown save SPI command %02X\n", CurCmd);
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);
}
}
}
}
@ -347,6 +613,9 @@ void LoadROM(char* path)
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;
@ -382,6 +651,15 @@ void LoadROM(char* path)
// 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);
}
void ReadROM(u32 addr, u32 len, u32 offset)