Struct kernel::services::sdmmc::Command

pub struct Command {
    pub index: u8,
    pub argument: u32,
    pub options: HardwareOptions,
    pub kind: CommandKind,
    pub rsp_type: ResponseType,
    pub rsp_crc: bool,
    pub buffer: Option<FixedVec<u8>>,
}

Parameters for building a command to be sent to the card.

The command format must follow the SD specification and is sent on the CMD line. It is 48-bit in length, containing a 6-bit command index and 32-bit argument. Besides that it includes 7-bit CRC and start, transmission and end bit.

The command structure is the same for SD memory, SDIO and MMC (?), but the content can be very different. Therefore the content of the commands is decided here in the kernel service, while the platform driver has the low-level implementation for how to physically send the necessary bits to the card.

Fields

index: u8

The numeric value of the command

argument: u32

The argument value for the command

options: HardwareOptions

Hardware specific configuration that should be applied

kind: CommandKind

The type of command

rsp_type: ResponseType

The expected type of the response

rsp_crc: bool

Whether the response CRC needs to be checked

buffer: Option<FixedVec<u8>>

Optional buffer for incoming or outgoing data

Trait Implementations

impl Default for Command

fn default() -> Self

Returns the “default value” for a type.