mgba/src/gba/gba-savedata.h

#ifndef GBA_SAVEDATA_H
#define GBA_SAVEDATA_H

#include "common.h"

struct VFile;

enum SavedataType {
	SAVEDATA_NONE = 0,
	SAVEDATA_SRAM,
	SAVEDATA_FLASH512,
	SAVEDATA_FLASH1M,
	SAVEDATA_EEPROM
};

enum SavedataCommand {
	EEPROM_COMMAND_NULL = 0,
	EEPROM_COMMAND_PENDING = 1,
	EEPROM_COMMAND_WRITE = 2,
	EEPROM_COMMAND_READ_PENDING = 3,
	EEPROM_COMMAND_READ = 4,

	FLASH_COMMAND_START = 0xAA,
	FLASH_COMMAND_CONTINUE = 0x55,

	FLASH_COMMAND_ERASE_CHIP = 0x10,
	FLASH_COMMAND_ERASE_SECTOR = 0x30,

	FLASH_COMMAND_NONE = 0,
	FLASH_COMMAND_ERASE = 0x80,
	FLASH_COMMAND_ID = 0x90,
	FLASH_COMMAND_PROGRAM = 0xA0,
	FLASH_COMMAND_SWITCH_BANK = 0xB0,
	FLASH_COMMAND_TERMINATE = 0xF0
};

enum FlashStateMachine {
	FLASH_STATE_RAW = 0,
	FLASH_STATE_START,
	FLASH_STATE_CONTINUE
};

enum FlashManufacturer {
	FLASH_MFG_PANASONIC = 0x1B32,
	FLASH_MFG_SANYO = 0x1362
};

enum {
	SAVEDATA_FLASH_BASE = 0x0E005555,

	FLASH_BASE_HI = 0x5555,
	FLASH_BASE_LO = 0x2AAA
};

struct GBASavedata {
	enum SavedataType type;
	uint8_t* data;
	enum SavedataCommand command;
	struct VFile* vf;

	int readBitsRemaining;
	int readAddress;
	int writeAddress;
	int writePending;
	int addressBits;

	uint8_t* currentBank;

	enum FlashStateMachine flashState;
};

void GBASavedataInit(struct GBASavedata* savedata, struct VFile* vf);
void GBASavedataDeinit(struct GBASavedata* savedata);
void GBASavedataMask(struct GBASavedata* savedata, struct VFile* vf);

void GBASavedataInitFlash(struct GBASavedata* savedata);
void GBASavedataInitEEPROM(struct GBASavedata* savedata);
void GBASavedataInitSRAM(struct GBASavedata* savedata);

uint8_t GBASavedataReadFlash(struct GBASavedata* savedata, uint16_t address);
void GBASavedataWriteFlash(struct GBASavedata* savedata, uint16_t address, uint8_t value);

uint16_t GBASavedataReadEEPROM(struct GBASavedata* savedata);
void GBASavedataWriteEEPROM(struct GBASavedata* savedata, uint16_t value, uint32_t writeSize);

#endif