Struct CircWrite 

pub struct CircWrite<'a, T: Copy, const N: usize> { /* private fields */ }

Continuous DMA-write typestate handle.

The DMA engine writes the buffer in circular mode. The CPU is the consumer and may drain the inactive half through a HalfGuard<Write, _, _> obtained from CircWrite::half_guard.

Implementations

impl<'a, T: Copy, const N: usize> CircWrite<'a, T, N>

pub fn dma_addr(&self) -> DmaAddr

DMA bus address of the buffer.

pub fn half_guard<'b, C: DcaCache>( &'b mut self, ctx: &mut DcaCacheCtx<'_, C>, half: Half, ) -> HalfGuard<'b, Write, T, N>

Acquire a guard over the inactive half.

Cache op for Write direction: DcaCache::invalidate over the inactive half so the CPU’s next read of that half observes DMA-written data.

pub fn stop_circular<C: DcaCache>( self, ctx: &mut DcaCacheCtx<'_, C>, ) -> Cpu<'a, T, N>

Stop the circular transfer and transition back to Cpu.

Caller MUST stop the engine before calling. Cache op: DcaCache::invalidate over the full padded extent so the CPU’s next read after release observes the final DMA-written state, not stale cache lines.