rt_dma_slave_transfer Struct Reference

#include <dma.h>

Data Fields
rt_ubase_t	src_addr
rt_ubase_t	dst_addr
void *	buffer
rt_ubase_t	dma_handle
rt_size_t	buffer_len
rt_size_t	period_len

Detailed Description

DMA slave transfer descriptor.

Describes a single DMA transfer: source/destination buffer addresses, total buffer length, and period length for cyclic transfers. Passed to rt_dma_prep_memcpy(), rt_dma_prep_cyclic(), or rt_dma_prep_single().

Field Documentation

src_addr

rt_ubase_t rt_dma_slave_transfer::src_addr

Source buffer physical address

dst_addr

rt_ubase_t rt_dma_slave_transfer::dst_addr

Destination buffer physical address

buffer

void* rt_dma_slave_transfer::buffer

Virtual address of the DMA buffer (if mapped)

dma_handle

rt_ubase_t rt_dma_slave_transfer::dma_handle

DMA bus address of the buffer

buffer_len

rt_size_t rt_dma_slave_transfer::buffer_len

Total buffer length in bytes

period_len

rt_size_t rt_dma_slave_transfer::period_len

Period length in bytes (for cyclic transfers only)