Enum Direction 

#[repr(C)]
pub enum Direction {
    ToDevice = 0,
    FromDevice = 1,
    Bidirectional = 2,
}

DMA 传输方向

参考 Linux enum dma_data_direction

Variants

ToDevice = 0

数据从 CPU 传输到设备 (DMA_TO_DEVICE)

FromDevice = 1

数据从设备传输到 CPU (DMA_FROM_DEVICE)

Bidirectional = 2

双向传输 (DMA_BIDIRECTIONAL)

Trait Implementations

impl Clone for Direction

fn clone(&self) -> Direction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Direction

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

Formats the value using the given formatter.

impl PartialEq for Direction

fn eq(&self, other: &Direction) -> 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 Direction

impl Eq for Direction

impl StructuralPartialEq for Direction