Struct RxDescriptor 

pub struct RxDescriptor { /* private fields */ }

RX DMA descriptor — enhanced 8-word layout (32 bytes).

See TxDescriptor for why we run the enhanced layout.

Implementations

impl RxDescriptor

pub const SIZE: usize = 32

Descriptor size in bytes (enhanced 8-word layout).

pub const fn new() -> Self

Create a new zeroed RX descriptor. Call setup_chained before use.

pub fn setup_chained( &self, buffer: *mut u8, buffer_size: usize, next_desc: *const RxDescriptor, )

Configure descriptor in chained mode and give to DMA.

Sets the buffer pointer, buffer size, next-descriptor pointer, the SECOND_ADDR_CHAINED flag, and the OWN bit.

pub fn is_owned(&self) -> bool

Check if DMA owns this descriptor.

pub fn set_owned(&self)

Give ownership to DMA.

pub fn clear_owned(&self)

Take ownership from DMA.

pub fn is_first(&self) -> bool

First descriptor of a frame.

pub fn is_last(&self) -> bool

Last descriptor of a frame.

pub fn is_complete_frame(&self) -> bool

Complete frame in a single descriptor (both first and last).

pub fn has_error(&self) -> bool

Check if the error summary bit is set.

pub fn error_flags(&self) -> u32

Raw error flags from RDES0.

pub fn frame_length(&self) -> usize

Frame length including CRC (valid on last descriptor).

pub fn payload_length(&self) -> usize

Frame length excluding the 4-byte CRC.

pub fn buffer_addr(&self) -> u32

Buffer address (RDES2).

pub fn next_desc_addr(&self) -> u32

Next descriptor address (RDES3, chained mode).

pub fn buffer_size(&self) -> usize

Configured buffer size from RDES1.

pub fn recycle(&self)

Clear status and return the descriptor to DMA for reuse.

pub fn raw_rdes0(&self) -> u32

Raw RDES0 value (for debugging / tests).

pub fn raw_rdes1(&self) -> u32

Raw RDES1 value (for debugging / tests).

Trait Implementations

impl Default for RxDescriptor

fn default() -> Self

Returns the “default value” for a type.

impl Send for RxDescriptor

impl Sync for RxDescriptor