rt_dma_chan Struct Reference

#include <dma.h>

Data Fields
const char *	name
struct rt_dma_controller *	ctrl
struct rt_device *	slave
rt_list_t	list
rt_err_t	conf_err
rt_err_t	prep_err
struct rt_dma_slave_config	conf
struct rt_dma_slave_transfer	transfer
void(*	callback )(struct rt_dma_chan *chan, rt_size_t size)
void *	priv

Detailed Description

DMA channel descriptor.

Represents an allocated DMA channel bound to a specific slave device. Tracks configuration and preparation errors to prevent operations on improperly set up channels.

Field Documentation

name

const char* rt_dma_chan::name

Channel name (from dma-names in device tree)

ctrl

struct rt_dma_controller* rt_dma_chan::ctrl

Parent DMA controller

slave

struct rt_device* rt_dma_chan::slave

Slave device that requested this channel

list

rt_list_t rt_dma_chan::list

Node in the controller's channels list

conf_err

rt_err_t rt_dma_chan::conf_err

Last configuration error (-RT_ERROR = not configured)

prep_err

rt_err_t rt_dma_chan::prep_err

Last preparation error (-RT_ERROR = not prepared)

conf

struct rt_dma_slave_config rt_dma_chan::conf

Saved slave configuration

transfer

struct rt_dma_slave_transfer rt_dma_chan::transfer

Saved transfer descriptor

callback

void(* rt_dma_chan::callback) (struct rt_dma_chan *chan, rt_size_t size)

Transfer completion callback

priv

void* rt_dma_chan::priv

Controller driver private data