Enum SaveDevice 

pub enum SaveDevice {
    None,
    Eeprom(Box<[u8]>),
    Sram(Box<[u8]>),
    Flash(FlashRam),
    ControllerPak(Box<[u8]>),
}

A cartridge save backend, sized + typed from the resolved SaveType.

Variants

None

No on-cart save.

Eeprom(Box<[u8]>)

Serial EEPROM (joybus), flat backing store (512 B or 2 KiB).

Sram(Box<[u8]>)

Battery SRAM (PI DOM2), flat 32 KiB.

Flash(FlashRam)

FlashRAM (PI DOM2), the erase/program/status machine.

ControllerPak(Box<[u8]>)

Controller Pak (joybus), flat 32 KiB.

Implementations

impl SaveDevice

pub fn new(save_type: SaveType) -> Self

Construct the backend for a resolved save type (erased/zeroed state).

pub fn pi_read(&self, addr: u32) -> Option<u8>

PI-bus read (SRAM / FlashRAM) at PI address addr. Returns None for a backend not on the PI bus, so the caller can fall through to open bus.

pub fn pi_write(&mut self, addr: u32, val: u8)

PI-bus write (SRAM / FlashRAM). The FlashRAM CIR at 0x0801_0000 is a 32-bit command; the Bus assembles the word and calls Self::flash_cir.

pub fn flash_cir(&mut self, cmd: u32)

Write the FlashRAM Command Internal Register (a whole 32-bit word).

pub fn eeprom_read_block(&self, block: u8, out: &mut [u8; 8])

Joybus EEPROM read of an 8-byte block (block index) into out.

pub fn eeprom_write_block(&mut self, block: u8, data: &[u8; 8])

Joybus EEPROM write of an 8-byte block.

pub fn cpak_read(&self, addr: u16, out: &mut [u8; 32])

Joybus Controller-Pak read of a 32-byte block at addr (byte offset).

pub fn cpak_write(&mut self, addr: u16, data: &[u8; 32])

Joybus Controller-Pak write of a 32-byte block at addr.

pub fn backing(&self) -> &[u8]

The persistable backing bytes (for the host save file). FlashRAM exposes its data array; the others their flat store. Empty for Self::None.

Trait Implementations

impl Clone for SaveDevice

fn clone(&self) -> SaveDevice

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SaveDevice

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for SaveDevice

fn default() -> SaveDevice

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for SaveDevice

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for SaveDevice

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.