Struct Command 

pub struct Command {
    pub cmd: u8,
    pub arg: u32,
    pub resp_type: ResponseType,
}

SD/MMC command definitions

Fields

cmd: u8

arg: u32

resp_type: ResponseType

Implementations

impl Command

pub const fn new(cmd: u8, arg: u32, resp_type: ResponseType) -> Self

pub const fn with_resp_type(self, resp_type: ResponseType) -> Self

Return a copy of this command with resp_type overridden.

Useful when the same command index has different response types depending on the transport (e.g. ACMD41 returns R3 in native mode but the OCR is not available in SPI mode where only an R1 byte is returned).

pub fn index(&self) -> u8

Command index (0–63)

pub fn argument(&self) -> u32

32-bit argument

pub const fn data_direction(&self) -> DataDirection

Direction of the data phase that follows this command.

Note: SDIO CMD53 carries its direction in the argument; this helper returns None for it. CMD6 is also returned as None because the same command index is reused for ACMD6 (SET_BUS_WIDTH, no data phase) and CMD6 SWITCH_FUNC (64-byte read). Drivers that issue SWITCH_FUNC choose the read-data submit path explicitly.

pub const fn data_block_size(&self) -> Option<u32>

Size (in bytes) of the data block this command transfers, when the answer is unambiguous from the command index alone.

Returns None for commands without a data phase, for commands whose block size depends on host configuration (e.g. CMD16-controlled SDSC blocks), and for indices that are reused across commands with different data shapes (e.g. CMD6).

pub fn crc7(&self) -> u8

Compute the 7-bit CRC for SPI mode transmission

pub fn to_spi_bytes(&self) -> [u8; 6]

Build the 6-byte SPI command packet

Trait Implementations

impl Clone for Command

fn clone(&self) -> Command

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Command

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

Formats the value using the given formatter.

impl PartialEq for Command

fn eq(&self, other: &Command) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Command

impl Eq for Command

impl StructuralPartialEq for Command