Result SPIReadSaveData(CardType type, u32 offset, void* data, u32 size) {
u8 cmd[4] = { SPI_CMD_READ };
u32 cmdSize = 4;
if(size == 0) return 0;
if(type == NO_CHIP) return 0xC8E13404;
Result res = SPIWaitWriteEnd(type);
if(res) return res;
size = (size <= SPIGetCapacity(type) - offset) ? size : SPIGetCapacity(type) - offset;
u32 pos = offset;
switch(type) {
case EEPROM_512B:
return _SPIReadSaveData_512B_impl(offset, data, size);
break;
case EEPROM_8KB:
case EEPROM_64KB:
cmdSize = 3;
cmd[1] = (u8)(pos >> 8);
cmd[2] = (u8) pos;
break;
case FLASH_256KB_1:
case FLASH_256KB_2:
case FLASH_512KB_1:
case FLASH_512KB_2:
case FLASH_1MB:
case FLASH_8MB:
case FLASH_512KB_INFRARED:
case FLASH_256KB_INFRARED:
cmdSize = 4;
cmd[1] = (u8)(pos >> 16);
cmd[2] = (u8)(pos >> 8);
cmd[3] = (u8) pos;
break;
default:
return 0; // never happens
}
return SPIWriteRead(type, cmd, cmdSize, data, size, NULL, 0);
}
void TWLCard::eraseSaveData(void (*cb)(u32, u32)) const {
u32 pos;
u32 sz = SPIGetCapacity(cardType_);
Result res;
cb(0, sz);
for(pos = 0; pos < sz; pos += 0x10000) {
res = SPIEraseSector(cardType_, pos);
if(res != 0) throw Error(res, __FILE__, __LINE__);
cb((sz < pos + 0x10000) ? sz : pos + 0x10000, sz);
}
}
u32 TWLCard::saveSize(void) const {
return SPIGetCapacity(cardType_);
}
Result SPIWriteSaveData(CardType type, u32 offset, void* data, u32 size) {
u8 cmd[4] = { 0 };
u32 cmdSize = 4;
u32 end = offset + size;
u32 pos = offset;
if(size == 0) return 0;
u32 pageSize = SPIGetPageSize(type);
if(pageSize == 0) return 0xC8E13404;
Result res = SPIWaitWriteEnd(type);
if(res) return res;
size = (size <= SPIGetCapacity(type) - offset) ? size : SPIGetCapacity(type) - offset;
while(pos < end) {
switch(type) {
case EEPROM_512B:
cmdSize = 2;
cmd[0] = (pos >= 0x100) ? SPI_512B_EEPROM_CMD_WRHI : SPI_512B_EEPROM_CMD_WRLO;
cmd[1] = (u8) pos;
break;
case EEPROM_8KB:
case EEPROM_64KB:
cmdSize = 3;
cmd[0] = SPI_CMD_PP;
cmd[1] = (u8)(pos >> 8);
cmd[2] = (u8) pos;
break;
case FLASH_256KB_1:
/*
This is what is done in the official implementation, but I think it's wrong
cmdSize = 4;
cmd[0] = SPI_CMD_PP;
cmd[1] = (u8)(pos >> 16);
cmd[2] = (u8)(pos >> 8);
cmd[3] = (u8) pos;
break;
*/
case FLASH_256KB_2:
case FLASH_512KB_1:
case FLASH_512KB_2:
case FLASH_1MB:
case FLASH_512KB_INFRARED:
case FLASH_256KB_INFRARED:
cmdSize = 4;
cmd[0] = SPI_FLASH_CMD_PW;
cmd[1] = (u8)(pos >> 16);
cmd[2] = (u8)(pos >> 8);
cmd[3] = (u8) pos;
break;
case FLASH_8MB:
return 0xC8E13404; // writing is unsupported (so is reading? need to test)
default:
return 0; // never happens
}
u32 remaining = end - pos;
u32 nb = pageSize - (pos % pageSize);
u32 dataSize = (remaining < nb) ? remaining : nb;
if( (res = SPIEnableWriting(type)) ) return res;
if( (res = SPIWriteRead(type, cmd, cmdSize, NULL, 0, (void*) ((u8*) data - offset + pos), dataSize)) ) return res;
if( (res = SPIWaitWriteEnd(type)) ) return res;
pos = ((pos / pageSize) + 1) * pageSize; // truncate
}
return 0;
}