DMA block configuration structure. More...

#include <dma.h>

Data Fields
uint32_t	source_address
	block starting address at source

uint32_t	dest_address
	block starting address at destination

uint32_t	source_gather_interval
	Address adjustment at gather boundary.

uint32_t	dest_scatter_interval
	Address adjustment at scatter boundary.

uint16_t	dest_scatter_count
	Continuous transfer count between scatter boundaries.

uint16_t	source_gather_count
	Continuous transfer count between gather boundaries.

uint32_t	block_size
	Number of bytes to be transferred for this block.

struct dma_block_config *	next_block
	Pointer to next block in a transfer list.

uint16_t	source_gather_en: 1
	Enable source gathering when set to 1.

uint16_t	dest_scatter_en: 1
	Enable destination scattering when set to 1.

uint16_t	source_addr_adj: 2
	Source address adjustment option.

uint16_t	dest_addr_adj: 2
	Destination address adjustment.

uint16_t	source_reload_en: 1
	Reload source address at the end of block transfer.

uint16_t	dest_reload_en: 1
	Reload destination address at the end of block transfer.

uint16_t	fifo_mode_control: 4
	FIFO fill before starting transfer, HW specific meaning.

uint16_t	flow_control_mode: 1
	Transfer flow control mode.

Detailed Description

DMA block configuration structure.

Aside from source address, destination address, and block size many of these options are hardware and driver dependent.

Field Documentation

◆ block_size

uint32_t dma_block_config::block_size

Number of bytes to be transferred for this block.

◆ dest_addr_adj

uint16_t dma_block_config::dest_addr_adj

Destination address adjustment.

0b00 increment
0b01 decrement
0b10 no change

◆ dest_address

uint32_t dma_block_config::dest_address

block starting address at destination

◆ dest_reload_en

uint16_t dma_block_config::dest_reload_en

Reload destination address at the end of block transfer.

◆ dest_scatter_count

uint16_t dma_block_config::dest_scatter_count

Continuous transfer count between scatter boundaries.

◆ dest_scatter_en

uint16_t dma_block_config::dest_scatter_en

Enable destination scattering when set to 1.

◆ dest_scatter_interval

uint32_t dma_block_config::dest_scatter_interval

Address adjustment at scatter boundary.

◆ fifo_mode_control

uint16_t dma_block_config::fifo_mode_control

FIFO fill before starting transfer, HW specific meaning.

◆ flow_control_mode

uint16_t dma_block_config::flow_control_mode

Transfer flow control mode.

0b0 source request service upon data availability
0b1 source request postponed until destination request happens

◆ next_block

struct dma_block_config* dma_block_config::next_block

Pointer to next block in a transfer list.

◆ source_addr_adj

uint16_t dma_block_config::source_addr_adj

Source address adjustment option.

0b00 increment
0b01 decrement
0b10 no change

◆ source_address

uint32_t dma_block_config::source_address

block starting address at source

◆ source_gather_count

uint16_t dma_block_config::source_gather_count

Continuous transfer count between gather boundaries.

◆ source_gather_en

uint16_t dma_block_config::source_gather_en

Enable source gathering when set to 1.

◆ source_gather_interval

uint32_t dma_block_config::source_gather_interval

Address adjustment at gather boundary.

◆ source_reload_en

uint16_t dma_block_config::source_reload_en

Reload source address at the end of block transfer.

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

zephyr/drivers/dma.h

Data Fields