dma_config Struct Reference

DMA configuration structure. More...

#include <dma.h>

Data Fields
uint32_t	dma_slot: 8
uint32_t	channel_direction: 3
uint32_t	complete_callback_en: 1
uint32_t	error_callback_en: 1
uint32_t	source_handshake: 1
uint32_t	dest_handshake: 1
uint32_t	channel_priority: 4
uint32_t	source_chaining_en: 1
uint32_t	dest_chaining_en: 1
uint32_t	linked_channel: 7
uint32_t	cyclic: 1
uint32_t	reserved: 3
uint32_t	source_data_size: 16
uint32_t	dest_data_size: 16
uint32_t	source_burst_length: 16
uint32_t	dest_burst_length: 16
uint32_t	block_count
struct dma_block_config *	head_block
void *	user_data
dma_callback_t	dma_callback

Detailed Description

DMA configuration structure.

Parameters

dma_slot	[ 0 : 7 ] - which peripheral and direction (HW specific)
channel_direction	[ 8 : 10 ] - 000-memory to memory, 001-memory to peripheral, 010-peripheral to memory, 011-peripheral to peripheral, 100-host to memory 101-memory to host ...
complete_callback_en	[ 11 ] - 0-callback invoked at completion only 1-callback invoked at completion of each block
error_callback_en	[ 12 ] - 0-error callback enabled 1-error callback disabled
source_handshake	[ 13 ] - 0-HW, 1-SW
dest_handshake	[ 14 ] - 0-HW, 1-SW
channel_priority	[ 15 : 18 ] - DMA channel priority
source_chaining_en	[ 19 ] - enable/disable source block chaining 0-disable, 1-enable
dest_chaining_en	[ 20 ] - enable/disable destination block chaining. 0-disable, 1-enable
linked_channel	[ 21 : 27 ] - after channel count exhaust will initiate a channel service request at this channel
cyclic	[ 28 ] - enable/disable cyclic buffer 0-disable, 1-enable
reserved	[ 29 : 31 ]
source_data_size	[ 0 : 15 ] - width of source data (in bytes)
dest_data_size	[ 16 : 31 ] - width of dest data (in bytes)
source_burst_length	[ 0 : 15 ] - number of source data units
dest_burst_length	[ 16 : 31 ] - number of destination data units
block_count	is the number of blocks used for block chaining, this depends on availability of the DMA controller.
user_data	private data from DMA client.
dma_callback	see dma_callback_t for details

Field Documentation

block_count

uint32_t dma_config::block_count

channel_direction

uint32_t dma_config::channel_direction

channel_priority

uint32_t dma_config::channel_priority

complete_callback_en

uint32_t dma_config::complete_callback_en

cyclic

uint32_t dma_config::cyclic

dest_burst_length

uint32_t dma_config::dest_burst_length

dest_chaining_en

uint32_t dma_config::dest_chaining_en

dest_data_size

uint32_t dma_config::dest_data_size

dest_handshake

uint32_t dma_config::dest_handshake

dma_callback

dma_callback_t dma_config::dma_callback

dma_slot

uint32_t dma_config::dma_slot

error_callback_en

uint32_t dma_config::error_callback_en

head_block

struct dma_block_config* dma_config::head_block

linked_channel

uint32_t dma_config::linked_channel

reserved

uint32_t dma_config::reserved

source_burst_length

uint32_t dma_config::source_burst_length

source_chaining_en

uint32_t dma_config::source_chaining_en

source_data_size

uint32_t dma_config::source_data_size

source_handshake

uint32_t dma_config::source_handshake

user_data

void* dma_config::user_data

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The documentation for this struct was generated from the following file:

• zephyr/drivers/dma.h