sgdk
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SRAM (Static RAM used for save backup) support. More...
#include "mapper.h"
Go to the source code of this file.
Defines | |
#define | SRAM_CONTROL MAPPER_BASE |
#define | SRAM_BASE 0x200001 |
Functions | |
void | SRAM_enable () |
Enable SRAM in Read Write mode. | |
void | SRAM_enableRO () |
Enable SRAM in Read Only mode. | |
void | SRAM_disable () |
Disable SRAM. | |
u8 | SRAM_readByte (u32 offset) |
Read a byte from the SRAM. | |
u16 | SRAM_readWord (u32 offset) |
Read a word from the SRAM. | |
u32 | SRAM_readLong (u32 offset) |
Read a long from the SRAM. | |
void | SRAM_writeByte (u32 offset, u8 val) |
Write a byte to the SRAM. | |
void | SRAM_writeWord (u32 offset, u16 val) |
Write a word to the SRAM. | |
void | SRAM_writeLong (u32 offset, u32 val) |
Write a long to the SRAM. |
SRAM (Static RAM used for save backup) support.
This unit provides methods to read from or write to SRAM.
Informations about SRAM (taken from Segaretro.org):
The regions specified by 0xA130F9-0xA130FF (0x200000-0x3FFFFF) can be either ROM or RAM and can be write-protected.
Here is the layout of the register as far as I know:
7 6 5 4 3 2 1 0
+-----------------------+
|??|??|??|??|??|??|WP|MD|
+-----------------------+
MD: Mode -- 0 = ROM, 1 = RAM
WP: Write protect -- 0 = writable, 1 = not writable
Read a byte from the SRAM.
offset | Offset where we want to read. |
Read a long from the SRAM.
offset | Offset where we want to read. |
Read a word from the SRAM.
offset | Offset where we want to read. |
Write a byte to the SRAM.
offset | Offset where we want to write. |
val | Value wto write. |
Write a long to the SRAM.
offset | Offset where we want to write. |
val | Value wto write. |