DMA transfer descriptor configuration.
When the source or destination address increment is enabled, the addresses stored into the configuration structure must correspond to the end of the transfer.
#include <dma.h>
Data Fields | |
| enum dma_beat_size | beat_size |
| Beat size is configurable as 8-bit, 16-bit, or 32-bit. More... | |
| enum dma_block_action | block_action |
| Action taken when a block transfer is completed. More... | |
| uint16_t | block_transfer_count |
| It is the number of beats in a block. More... | |
| bool | descriptor_valid |
| Descriptor valid flag used to identify whether a descriptor is valid or not. More... | |
| uint32_t | destination_address |
| Transfer destination address. More... | |
| bool | dst_increment_enable |
| Used for enabling the destination address increment. More... | |
| enum dma_event_output_selection | event_output_selection |
| This is used to generate an event on specific transfer action in a channel. More... | |
| uint32_t | next_descriptor_address |
| Set to zero for static descriptors. More... | |
| uint32_t | source_address |
| Transfer source address. More... | |
| bool | src_increment_enable |
| Used for enabling the source address increment. More... | |
| enum dma_step_selection | step_selection |
| This bit selects whether the source or destination address is using the step size settings. More... | |
| enum dma_address_increment_stepsize | step_size |
| The step size for source/destination address increment. More... | |
| enum dma_beat_size dma_descriptor_config::beat_size |
Beat size is configurable as 8-bit, 16-bit, or 32-bit.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| enum dma_block_action dma_descriptor_config::block_action |
Action taken when a block transfer is completed.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| uint16_t dma_descriptor_config::block_transfer_count |
It is the number of beats in a block.
This count value is decremented by one after each beat data transfer.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| bool dma_descriptor_config::descriptor_valid |
Descriptor valid flag used to identify whether a descriptor is valid or not.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| uint32_t dma_descriptor_config::destination_address |
Transfer destination address.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| bool dma_descriptor_config::dst_increment_enable |
Used for enabling the destination address increment.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| enum dma_event_output_selection dma_descriptor_config::event_output_selection |
This is used to generate an event on specific transfer action in a channel.
Supported only in four lower channels.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| uint32_t dma_descriptor_config::next_descriptor_address |
Set to zero for static descriptors.
This must have a valid memory address for linked descriptors.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| uint32_t dma_descriptor_config::source_address |
Transfer source address.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| bool dma_descriptor_config::src_increment_enable |
Used for enabling the source address increment.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| enum dma_step_selection dma_descriptor_config::step_selection |
This bit selects whether the source or destination address is using the step size settings.
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
| enum dma_address_increment_stepsize dma_descriptor_config::step_size |
The step size for source/destination address increment.
The next address is calculated as next_addr = addr + (2^step_size * beat size).
Referenced by dma_descriptor_create(), and dma_descriptor_get_config_defaults().
1.8.5