dma_config Struct Reference

DMA configuration structure. More...

#include <dma.h>

Data Fields
uint32_t	dma_slot: 8
	Which peripheral and direction, HW specific.
uint32_t	channel_direction: 3
	Direction the transfers are occurring.
uint32_t	complete_callback_en: 1
	Completion callback enable.
uint32_t	error_callback_dis: 1
	Error callback disable.
uint32_t	source_handshake: 1
	Source handshake, HW specific.
uint32_t	dest_handshake: 1
	Destination handshake, HW specific.
uint32_t	channel_priority: 4
	Channel priority for arbitration, HW specific.
uint32_t	source_chaining_en: 1
	Source chaining enable, HW specific.
uint32_t	dest_chaining_en: 1
	Destination chaining enable, HW specific.
uint32_t	linked_channel: 7
	Linked channel, HW specific.
uint32_t	cyclic: 1
	Cyclic transfer list, HW specific.
uint32_t	source_data_size: 16
	Width of source data (in bytes)
uint32_t	dest_data_size: 16
	Width of destination data (in bytes)
uint32_t	source_burst_length: 16
	Source burst length in bytes.
uint32_t	dest_burst_length: 16
	Destination burst length in bytes.
uint32_t	block_count
	Number of blocks in transfer list.
struct dma_block_config *	head_block
	Pointer to the first block in the transfer list.
void *	user_data
	Optional attached user data for callbacks.
dma_callback_t	dma_callback
	Optional callback for completion and error events.

Detailed Description

DMA configuration structure.

Field Documentation

block_count

uint32_t dma_config::block_count

Number of blocks in transfer list.

channel_direction

uint32_t dma_config::channel_direction

Direction the transfers are occurring.

• 0b000 memory to memory,
• 0b001 memory to peripheral,
• 0b010 peripheral to memory,
• 0b011 peripheral to peripheral,
• 0b100 host to memory
• 0b101 memory to host
• others hardware specific

channel_priority

uint32_t dma_config::channel_priority

Channel priority for arbitration, HW specific.

complete_callback_en

uint32_t dma_config::complete_callback_en

Completion callback enable.

• 0b0 callback invoked at transfer list completion only
• 0b1 callback invoked at completion of each block

cyclic

uint32_t dma_config::cyclic

Cyclic transfer list, HW specific.

dest_burst_length

uint32_t dma_config::dest_burst_length

Destination burst length in bytes.

dest_chaining_en

uint32_t dma_config::dest_chaining_en

Destination chaining enable, HW specific.

dest_data_size

uint32_t dma_config::dest_data_size

Width of destination data (in bytes)

dest_handshake

uint32_t dma_config::dest_handshake

Destination handshake, HW specific.

• 0b0 HW
• 0b1 SW

dma_callback

dma_callback_t dma_config::dma_callback

Optional callback for completion and error events.

dma_slot

uint32_t dma_config::dma_slot

Which peripheral and direction, HW specific.

error_callback_dis

uint32_t dma_config::error_callback_dis

Error callback disable.

• 0b0 error callback enabled
• 0b1 error callback disabled

head_block

struct dma_block_config* dma_config::head_block

Pointer to the first block in the transfer list.

linked_channel

uint32_t dma_config::linked_channel

Linked channel, HW specific.

source_burst_length

uint32_t dma_config::source_burst_length

Source burst length in bytes.

source_chaining_en

uint32_t dma_config::source_chaining_en

Source chaining enable, HW specific.

source_data_size

uint32_t dma_config::source_data_size

Width of source data (in bytes)

source_handshake

uint32_t dma_config::source_handshake

Source handshake, HW specific.

• 0b0 HW
• 0b1 SW

user_data

void* dma_config::user_data

Optional attached user data for callbacks.

---

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

• zephyr/drivers/dma.h