Generic Vector DMA layer.

Helper layer that provides the common functionality for Vector DMA (VDMA). More...

Data Structures
struct	nrf_vdma_job_t
	Structure describing VDMA job. More...

Macros
#define	NRF_VDMA_BUFFER_SIZE_MASK   VDMADESCRIPTOR_CONFIG_CNT_Msk
	Maximum size of VDMA buffer.
#define	NRF_VDMA_REDUCED_JOB_SIZE(count)
	Macro for computing size of the array of reduced job structures.
#define	NRF_VDMA_JOB_ELEMENT(p_buffer, size, attribute)
	Macro for defining an element of a job list.
#define	NRF_VDMA_REDUCED_JOB_INIT_ELEMENT(p_buffer, size, attribute)
	Macro for defining initial element of reduced job list.
#define	NRFX_VDMA_PERIPH_JOB(addr, size)
	Macro for defining a job for transfer engaging peripheral.

Typedefs
typedef uint32_t	nrf_vdma_job_reduced_t
	Type describing VDMA job with fixed attributes and length.

Enumerations
enum	nrf_vdma_attributes_t {   NRF_VDMA_ATTRIBUTE_PLAIN_DATA = 0x00 ,   NRF_VDMA_ATTRIBUTE_BYTE_SWAP = 0x07 ,   NRF_VDMA_ATTRIBUTE_JOB_LIST = 0x08 ,   NRF_VDMA_ATTRIBUTE_BUFFER_FILL = 0x09 ,   NRF_VDMA_ATTRIBUTE_FIXED_ATTR = 0x0A ,   NRF_VDMA_ATTRIBUTE_CRC = 0x0B ,   NRF_VDMA_ATTRIBUTE_STATIC_ADDR = 0x0C ,   NRF_VDMA_ATTRIBUTE_PLAIN_DATA_BUF_WRITE = 0x0D }
	VDMA attributes. More...
enum	nrf_vdma_ext_attribute_t {   NRF_VDMA_EXT_ATTRIBUTE_PERIPHERAL_MODE = 0x40 ,   NRF_VDMA_EXT_ATTRIBUTE_EVENT_ENABLE = 0x80 }
	VDMA extended attributes. More...

Functions
__STATIC_INLINE void	nrf_vdma_job_fill (nrf_vdma_job_t *p_job, void *p_buffer, size_t size, uint8_t attributes)
	Function for filling the specified structure of the job with given job parameters.
__STATIC_INLINE void	nrf_vdma_job_reduced_init (nrf_vdma_job_reduced_t *p_job, void *p_buffer, size_t size, uint8_t attributes)
	Function for initializing the specified structure of the job with fixed attributes.
__STATIC_INLINE void	nrf_vdma_job_reduced_fill (nrf_vdma_job_reduced_t *p_job, void *p_buffer)
	Function for filling the specified reduced structure of the job with given buffer pointer.
__STATIC_INLINE void *	nrf_vdma_job_buffer_get (nrf_vdma_job_t const *p_job)
	Function for getting the pointer to the buffer associated with specified job.
__STATIC_INLINE size_t	nrf_vdma_job_size_get (nrf_vdma_job_t const *p_job)
	Function for getting the size of the buffer associated with specified job.
__STATIC_INLINE void	nrf_vdma_job_terminate (nrf_vdma_job_t *p_job)
	Function for terminating the specified job.
__STATIC_INLINE void	nrf_vdma_job_link (nrf_vdma_job_t *p_job, nrf_vdma_job_t *p_job_linked)
	Function for linking the job with another job.

Detailed Description

Helper layer that provides the common functionality for Vector DMA (VDMA).

Macro Definition Documentation

NRF_VDMA_JOB_ELEMENT

#define NRF_VDMA_JOB_ELEMENT	(		p_buffer,
			size,
			attribute )

Value:

        (uint32_t)p_buffer,                                               \
        (uint32_t)(((attribute) << VDMADESCRIPTOR_CONFIG_ATTRIBUTE_Pos) | \
                   ((size) & NRF_VDMA_BUFFER_SIZE_MASK))

Macro for defining an element of a job list.

Parameters

[in]	p_buffer	Pointer to the buffer.
[in]	size	Size of the transfer.
[in]	attribute	Attribute mask.

Returns

Two words of the job descriptor.

NRF_VDMA_REDUCED_JOB_INIT_ELEMENT

#define NRF_VDMA_REDUCED_JOB_INIT_ELEMENT	(		p_buffer,
			size,
			attribute )

Value:

    NRF_VDMA_JOB_ELEMENT(p_buffer, size, NRF_VDMA_ATTRIBUTE_FIXED_ATTR | (attribute))

Macro for defining initial element of reduced job list.

Parameters

[in]	p_buffer	Job buffer.
[in]	size	Size of the job buffer.
[in]	attribute	Attributes of the job.

Returns

Two words of the job descriptor.

NRF_VDMA_REDUCED_JOB_SIZE

#define NRF_VDMA_REDUCED_JOB_SIZE

(

count

)

Value:

(count + 2)

Macro for computing size of the array of reduced job structures.

Parameters

[in]

count

Number of jobs to be stored in reduced job list.

NRFX_VDMA_PERIPH_JOB

#define NRFX_VDMA_PERIPH_JOB	(		addr,
			size )

Value:

        NRF_VDMA_JOB_ELEMENT(addr, size, NRF_VDMA_EXT_ATTRIBUTE_PERIPHERAL_MODE)

Macro for defining a job for transfer engaging peripheral.

Parameters

[in]	addr	Starting address.
[in]	size	Size of a DMA job.

Returns

Two words which contains address, size and the descriptor byte.

Enumeration Type Documentation

nrf_vdma_attributes_t

enum nrf_vdma_attributes_t

VDMA attributes.

Note

Only one attribute can be set for the job.

Enumerator
NRF_VDMA_ATTRIBUTE_PLAIN_DATA	Data is not modified.
NRF_VDMA_ATTRIBUTE_BYTE_SWAP	Data bytes are swapped.
NRF_VDMA_ATTRIBUTE_JOB_LIST	Allows chaining of joblists.
NRF_VDMA_ATTRIBUTE_BUFFER_FILL	Insters zeros into sink data buffers. Sink job attribute only.
NRF_VDMA_ATTRIBUTE_FIXED_ATTR	Identical job attributes and sizes for all jobs in the list.
NRF_VDMA_ATTRIBUTE_CRC	CRC checksum is calculated on all data in the source list.
NRF_VDMA_ATTRIBUTE_STATIC_ADDR	Memory address is fixed for the entirety of the job.
NRF_VDMA_ATTRIBUTE_PLAIN_DATA_BUF_WRITE	Used to get better write performance when many short bursts are beiing sent.

nrf_vdma_ext_attribute_t

enum nrf_vdma_ext_attribute_t

VDMA extended attributes.

Note

This attributes can be combined with each other and with standard attribute

Function Documentation

nrf_vdma_job_buffer_get()

__STATIC_INLINE void * nrf_vdma_job_buffer_get

(

nrf_vdma_job_t const *

p_job

)

Function for getting the pointer to the buffer associated with specified job.

Parameters

[in]

p_job

Pointer to the structure of the specified job.

Returns

Pointer to the job buffer.

nrf_vdma_job_fill()

__STATIC_INLINE void nrf_vdma_job_fill	(	nrf_vdma_job_t *	p_job,
		void *	p_buffer,
		size_t	size,
		uint8_t	attributes )

Function for filling the specified structure of the job with given job parameters.

Parameters

[out]	p_job	Pointer to the structure of the job to be filled.
[in]	p_buffer	Job buffer.
[in]	size	Size of the job buffer.
[in]	attributes	Attributes of the job.

nrf_vdma_job_link()

__STATIC_INLINE void nrf_vdma_job_link	(	nrf_vdma_job_t *	p_job,
		nrf_vdma_job_t *	p_job_linked )

Function for linking the job with another job.

When VectorDMA encounters job that is linked to another job, execution of the linked job starts.

Parameters

[out]	p_job	Pointer to the structure of the job to become link.
[in]	p_job_linked	Pointer to the structure of the job to be linked.

nrf_vdma_job_reduced_fill()

__STATIC_INLINE void nrf_vdma_job_reduced_fill	(	nrf_vdma_job_reduced_t *	p_job,
		void *	p_buffer )

Function for filling the specified reduced structure of the job with given buffer pointer.

Parameters

[out]	p_job	Pointer to the reduced structure of the job to be filled.
[in]	p_buffer	Job buffer.

nrf_vdma_job_reduced_init()

__STATIC_INLINE void nrf_vdma_job_reduced_init	(	nrf_vdma_job_reduced_t *	p_job,
		void *	p_buffer,
		size_t	size,
		uint8_t	attributes )

Function for initializing the specified structure of the job with fixed attributes.

First element of reduced job list occupies space for two elements.

Note

Use nrf_vdma_job_terminate() to terminate reduced job list.

Parameters

[out]	p_job	Pointer to the reduced structure of the job to be filled.
[in]	p_buffer	Job buffer.
[in]	size	Size of the job buffer.
[in]	attributes	Additional attribute of the job.

nrf_vdma_job_size_get()

__STATIC_INLINE size_t nrf_vdma_job_size_get

(

nrf_vdma_job_t const *

p_job

)

Function for getting the size of the buffer associated with specified job.

Parameters

[in]

p_job

Pointer to the structure of the specified job.

Returns

Size of the job buffer.

nrf_vdma_job_terminate()

__STATIC_INLINE void nrf_vdma_job_terminate

(

nrf_vdma_job_t *

p_job

)

Function for terminating the specified job.

When VectorDMA encounters job that is terminated, processing of the job list stops.

Parameters

[out]

p_job

Pointer to the structure of the job to be terminated.