dma_common.c File Reference

#include "hal/driver/driver.h"

Macros
#define	VSF_DMA_CFG_FUNCTION_RENAME   DISABLED

Functions
vsf_err_t	vsf_dma_init (vsf_dma_t *dma_ptr, vsf_dma_cfg_t *cfg_ptr)
	Initialize a DMA instance.
void	vsf_dma_fini (vsf_dma_t *dma_ptr)
	Finalize a DMA instance.
vsf_dma_capability_t	vsf_dma_capability (vsf_dma_t *dma_ptr)
	Get the capabilities of DMA instance.
int8_t	vsf_dma_channel_request (vsf_dma_t *dma_ptr, vsf_dma_channel_hint_t *channel_hint_ptr)
	DMA request a new channel.
void	vsf_dma_channel_release (vsf_dma_t *dma_ptr, uint8_t channel)
	Release a DMA channel.
vsf_err_t	vsf_dma_channel_config (vsf_dma_t *dma_ptr, uint8_t channel, vsf_dma_channel_cfg_t *cfg_ptr)
	Configure a DMA channel.
vsf_err_t	vsf_dma_channel_start (vsf_dma_t *dma_ptr, uint8_t channel, uint32_t src_address, uint32_t dst_address, uint32_t count)
	Start a DMA channel transfer.
vsf_err_t	vsf_dma_channel_sg_config_desc (vsf_dma_t *dma_ptr, uint8_t channel, vsf_dma_isr_t isr, vsf_dma_channel_sg_desc_t *sg_desc_ptr, uint32_t sg_count)
	Configure a DMA channel for scatter-gather transfer.
vsf_err_t	vsf_dma_channel_sg_start (vsf_dma_t *dma_ptr, uint8_t channel)
	Start a DMA scatter-gather transfer.
vsf_err_t	vsf_dma_channel_cancel (vsf_dma_t *dma_ptr, uint8_t channel)
	Cancel the transmission of a specific DMA channel.
uint32_t	vsf_dma_channel_get_transferred_count (vsf_dma_t *dma_ptr, uint8_t channel)
	Get the counter of bytes transferred for a specific DMA channel.
vsf_dma_channel_status_t	vsf_dma_channel_status (vsf_dma_t *dma_ptr, uint8_t channel)
	Get status of a DMA channel.

Macro Definition Documentation

VSF_DMA_CFG_FUNCTION_RENAME

#define VSF_DMA_CFG_FUNCTION_RENAME   DISABLED

Function Documentation

vsf_dma_init()

vsf_err_t vsf_dma_init	(	vsf_dma_t *	dma_ptr,
		vsf_dma_cfg_t *	cfg_ptr
	)

Initialize a DMA instance.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	cfg_ptr	a pointer to structure vsf_dma_cfg_t

Returns

vsf_err_t: VSF_ERR_NONE if initialization successful, otherwise returns error code

Note

It is not necessary to call vsf_dma_fini() to deinitialization. vsf_dma_init() should be called before any other DMA API except vsf_dma_capability().

vsf_dma_fini()

void vsf_dma_fini

(

vsf_dma_t *

dma_ptr

)

Finalize a DMA instance.

Parameters

[in]

dma_ptr

a pointer to structure vsf_dma_t

Returns

none

vsf_dma_capability()

vsf_dma_capability_t vsf_dma_capability

(

vsf_dma_t *

dma_ptr

)

Get the capabilities of DMA instance.

Parameters

[in]

dma_ptr

a pointer to structure vsf_dma_t

Returns

vsf_dma_capability_t: All capabilities of current DMA vsf_dma_capability_t

vsf_dma_channel_request()

int8_t vsf_dma_channel_request	(	vsf_dma_t *	dma_ptr,
		vsf_dma_channel_hint_t *	channel_hint_ptr
	)

DMA request a new channel.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel_hint_ptr	a pointer to DMA channel hint

Returns

int8_t: if request was successful, return non-negative channel number, otherwise return error code

vsf_dma_channel_release()

void vsf_dma_channel_release	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel
	)

Release a DMA channel.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number

Returns

none

vsf_dma_channel_config()

vsf_err_t vsf_dma_channel_config	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel,
		vsf_dma_channel_cfg_t *	cfg_ptr
	)

Configure a DMA channel.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number
[in]	cfg_ptr	a pointer to DMA channel configuration

Returns

vsf_err_t: VSF_ERR_NONE if the configuration was successful, otherwise returns error code

vsf_dma_channel_start()

vsf_err_t vsf_dma_channel_start	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel,
		uint32_t	src_address,
		uint32_t	dst_address,
		uint32_t	count
	)

Start a DMA channel transfer.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number
[in]	src_address	source address
[in]	dst_address	destination address
[in]	count	counter of data to be transferred (in byte)

Returns

vsf_err_t: VSF_ERR_NONE if the start request was successful, otherwise returns error code

vsf_dma_channel_sg_config_desc()

vsf_err_t vsf_dma_channel_sg_config_desc	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel,
		vsf_dma_isr_t	isr,
		vsf_dma_channel_sg_desc_t *	sg_desc_ptr,
		uint32_t	sg_count
	)

Configure a DMA channel for scatter-gather transfer.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number
[in]	isr	DMA interrupt handler
[in]	cfg_ptr	a pointer to DMA channel scatter-gather configuration
[in]	sg_count	number of scatter-gather configurations

Returns

vsf_err_t: VSF_ERR_NONE if the configuration was successful, otherwise returns error code

vsf_dma_channel_sg_start()

vsf_err_t vsf_dma_channel_sg_start	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel
	)

Start a DMA scatter-gather transfer.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number

Returns

vsf_err_t: VSF_ERR_NONE if the start request was successful, otherwise returns error code

vsf_dma_channel_cancel()

vsf_err_t vsf_dma_channel_cancel	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel
	)

Cancel the transmission of a specific DMA channel.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number

Returns

vsf_err_t: VSF_ERR_NONE if the cancel request was successful, otherwise returns error code

vsf_dma_channel_get_transferred_count()

uint32_t vsf_dma_channel_get_transferred_count	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel
	)

Get the counter of bytes transferred for a specific DMA channel.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number

Returns

uint32_t: Number of bytes transferred

Note

: If called after VSF_DMA_IRQ_MASK_CPL interrupt trigger, it should return 0.

: It is usually called after call vsf_dma_channel_cancel() to get the counter that has been transferred.

vsf_dma_channel_status()

vsf_dma_channel_status_t vsf_dma_channel_status	(	vsf_dma_t *	dma_ptr,
		uint8_t	channel
	)

Get status of a DMA channel.

Parameters

[in]	dma_ptr	a pointer to structure vsf_dma_t
[in]	channel	channel number

Returns

vsf_dma_channel_status_t: Status of the DMA channel