DMA: Direct Memory Access Driver

Overview

This document consists of sections titled with Driver Overview, Data Structures, Enumerations, Functions, etc., each with an overview list and detailed documentation. It is recommended to read the Driver Overview first for it includes a comprehensive description of the peripheral, driver and driver changes. Other sections give detailed information for APIs, enums, macros, etc., for your further reference.

Modules
	DMA Peripheral and Driver Overview
	Content including 1) peripheral features, work logic and work method; 2) driver design logic and use method; 3) typical use case.
	The Driver Change Log
	The current DMA driver version is 2.0.0.

Data Structures
struct	dma_channel_link_config_t
	DMA channel link configuration structure. More...
struct	dma_channel_transfer_config_t
	DMA channel transfer configuration structure. More...
struct	dma_config_t
	DMA configuration structure. More...
struct	dma_handle_t
	DMA transfer handle structure. More...

Typedefs
typedef void(*	dma_transfer_callback_t )(dma_handle_t *psHandle, void *pUserData)
	Define callback function for DMA. More...

Enumerations
enum	{ kStatus_DMA_ChannelBusy = MAKE_STATUS(kStatusGroup_DMA, 0) }
	_dma_channeltransfer_status DMA transfer status More...
enum	dma_channel_transfer_type_t {   kDMA_ChannelTransferMemoryToMemory = 0x0U,   kDMA_ChannelTransferPeripheralToMemory,   kDMA_ChannelTransferMemoryToPeripheral }
	DMA channel transfer type. More...
enum	_dma_channel_interrupt_enable { kDMA_ChannelInterruptEnable }
	DMA interrupt source. More...
enum	_dma_channel_status_flags {   kDMA_ChannelTransactionsBCRFlag = DMA_DSR_BCR_BCR_MASK,   kDMA_ChannelTransactionsDoneFlag = DMA_DSR_BCR_DONE_MASK,   kDMA_ChannelTransactionsBusyFlag = DMA_DSR_BCR_BSY_MASK,   kDMA_ChannelTransactionsRequestFlag = DMA_DSR_BCR_REQ_MASK }
	_dma_channel_status_flags DMA channel status flags. More...
enum	_dma_error_status_flags {   kDMA_ChannelConfigurationErrorFlag,   kDMA_ChannelBusErrorOnSourceFlag,   kDMA_ChannelBusErrorOnDestinatiFlag }
	_dma_error_status_flags DMA channel detail error status flags. More...
enum	dma_channel_t {   kDMA_Channel0 = 0U,   kDMA_Channel1 = 1U,   kDMA_Channel2 = 2U,   kDMA_Channel3 = 3U }
	DMA channel index. More...
enum	dma_channel_transfer_width_t {   kDMA_ChannelTransferWidth32Bits = 0x0U,   kDMA_ChannelTransferWidth8Bits,   kDMA_ChannelTransferWidth16Bits }
	DMA transfer width configuration. More...
enum	dma_channel_modulo_t {   kDMA_ChannelModuloDisable = 0x0U,   kDMA_ChannelModulo16bytes,   kDMA_ChannelModulo32bytes,   kDMA_ChannelModulo64bytes,   kDMA_ChannelModulo128bytes,   kDMA_ChannelModulo256bytes,   kDMA_ChannelModulo512bytes,   kDMA_ChannelModulo1Kbytes,   kDMA_ChannelModulo2Kbytes,   kDMA_ChannelModulo4Kbytes,   kDMA_ChannelModulo8Kbytes,   kDMA_ChannelModulo16Kbytes,   kDMA_ChannelModulo32Kbytes,   kDMA_ChannelModulo64Kbytes,   kDMA_ChannelModulo128Kbytes,   kDMA_ChannelModulo256Kbytes }
	DMA channel modulo configuration. More...
enum	dma_channel_link_type_t {   kDMA_ChannelLinkDisable = 0x0U,   kDMA_ChannelLinkChannel1AndChannel2,   kDMA_ChannelLinkChannel1,   kDMA_ChannelLinkChannel1AfterBCR0 }
	DMA channel link type. More...
enum	dma_channel_address_increment_type_t {   kDMA_ChannelAddressFix = 0x0U,   kDMA_ChannelAddressIncrement = 0x1U }
	DMA transfer address increment definition. More...

Driver version
#define	FSL_DMA_DRIVER_VERSION   (MAKE_VERSION(2, 0, 0))
	DMA driver version. More...

DMA Initialization and De-initialization interfaces
void	DMA_Init (DMA_Type *base, dma_config_t *psConfig)
	DMA initialization. More...
void	DMA_Deinit (DMA_Type *base)
	DMA De-initialization. More...

DMA channel functional interfaces
void	DMA_ResetChannel (DMA_Type *base, dma_channel_t eChannel)
	Resets the DMA channel. More...
void	DMA_GetChannelDefaultTransferConfig (dma_channel_transfer_config_t *psTransfer, uint32_t u32SrcAddr, uint32_t u32DstAddr, uint32_t u32TotalBytes, dma_channel_transfer_width_t eTransferWidth, dma_channel_transfer_type_t eTransferType)
	Get channel default transfer configuration. More...
void	DMA_SetChannelTransferConfig (DMA_Type *base, dma_channel_t eChannel, dma_channel_transfer_config_t *psTransfer)
	DMA set channel transfer configurations. More...
void	DMA_SetChannelLinkConfig (DMA_Type *base, dma_channel_t eChannel, dma_channel_link_config_t *pLinkConfig)
	Configures the DMA channel link feature. More...
static void	DMA_SetChannelSourceAddress (DMA_Type *base, dma_channel_t eChannel, uint32_t u32SrcAddr)
	Sets the DMA source address for the DMA transfer. More...
static void	DMA_SetChannelDestinationAddress (DMA_Type *base, dma_channel_t eChannel, uint32_t u32DestAddr)
	Sets the DMA destination address for the DMA transfer. More...
static void	DMA_SetChannelTransferSize (DMA_Type *base, dma_channel_t eChannel, uint32_t u32TransferSize)
	Sets the DMA transfer size for the DMA transfer. More...
void	DMA_SetChannelPeripheralRequest (DMA_Type *base, dma_channel_t eChannel, dma_channel_request_source_t eChannelRequestSource)
	Sets the DMA transfer peripheral number for the DMA transfer. More...
void	DMA_SetChannelModulo (DMA_Type *base, dma_channel_t eChannel, dma_channel_modulo_t eSrcModulo, dma_channel_modulo_t eDestModulo)
	Sets the source address range and the destination address range for the DMA transfer. More...
static void	DMA_EnableChannelCycleSteal (DMA_Type *base, dma_channel_t eChannel, bool bEnable)
	Enables the DMA cycle steal for the DMA transfer. More...
static void	DMA_EnableChannelAutoAlign (DMA_Type *base, dma_channel_t eChannel, bool bEnable)
	Enables the DMA auto align for the DMA transfer. More...

DMA Channel interrupt Interfaces
static void	DMA_EnableChannelInterrupt (DMA_Type *base, dma_channel_t eChannel, bool bEnable)
	Enables an interrupt for the DMA transfer. More...

DMA Channel Transfer Operation
static void	DMA_EnableChannelPeripheralRequest (DMA_Type *base, dma_channel_t eChannel, bool bEnable)
	Enables the DMA hardware channel request. More...
static void	DMA_TriggerChannelStart (DMA_Type *base, dma_channel_t eChannel)
	Starts the DMA transfer with a software trigger. More...
static void	DMA_EnableChannelAutoStopRequest (DMA_Type *base, dma_channel_t eChannel, bool bEnable)
	Starts the DMA enable/disable auto disable request. More...

DMA Channel Status Interfaces
static uint32_t	DMA_GetChannelRemainingBytes (DMA_Type *base, dma_channel_t eChannel)
	Gets the remaining bytes of the current DMA transfer. More...
static uint32_t	DMA_GetChannelStatusFlags (DMA_Type *base, dma_channel_t eChannel)
	Gets the DMA channel status flags. More...
static void	DMA_ClearChannelDoneStatus (DMA_Type *base, dma_channel_t eChannel)
	Clears the DMA channel status flags. More...

DMA Transactional Interfaces
void	DMA_TransferChannelCreateHandle (DMA_Type *base, dma_handle_t *psHandle, dma_channel_t eChannel, dma_transfer_callback_t pfCallback, void *pUserData)
	Creates the DMA handle. More...
status_t	DMA_TransferChannelSubmit (dma_handle_t *psHandle, dma_channel_transfer_config_t *psTransfer)
	Submits the DMA transfer request. More...
void	DMA_TransferChannelStart (dma_handle_t *psHandle, bool bIsPeripheral)
	DMA starts transfer. More...
void	DMA_TransferChannelStop (dma_handle_t *psHandle)
	DMA stops a transfer. More...
void	DMA_TransferChannelAbort (dma_handle_t *psHandle)
	DMA aborts transfer. More...
void	DMA_TransferChannelHandleIRQ (dma_handle_t *psHandle)
	DMA IRQ handler for current transfer complete. More...

---

Data Structure Documentation

struct dma_channel_link_config_t

Data Fields
dma_channel_link_type_t	linkType
	Channel link type. More...
dma_channel_t	eChannel1
	The index of channel 1. More...
dma_channel_t	eChannel2
	The index of channel 2. More...

Field Documentation

dma_channel_link_type_t dma_channel_link_config_t::linkType

dma_channel_t dma_channel_link_config_t::eChannel1

dma_channel_t dma_channel_link_config_t::eChannel2

struct dma_channel_transfer_config_t

The transfer configuration structure support full feature configuration of the transfer control descriptor.

Data Fields
uint32_t	u32SrcAddr
	source byte address
uint32_t	u32DstAddr
	destination byte address
dma_channel_transfer_width_t	eSrcWidthOfEachTransfer
	source width of each transfer
dma_channel_transfer_width_t	eDstWidthOfEachTransfer
	destination width of each transfer
dma_channel_modulo_t	eSrcAddrModulo
	Defines the size of the source data circular buffer used by the DMA Controller.
dma_channel_modulo_t	eDstAddrModulo
	defines the size of the destination data circular buffer used by the DMA Controller
dma_channel_address_increment_type_t	eEnableSrcIncrement
	Source address increase after each transfer.
dma_channel_address_increment_type_t	eEnableDestIncrement
	destination address increase after each transfer
dma_channel_link_config_t *	pChannelLinkControl
	allows DMA channels to have their transfers linked
uint32_t	u32TransferSize
	the number of bytes to be transferred
bool	bEnableInterrupt
	enable interrupt on completion of transfer
bool	bEnableAutoAlign
	enable the channel auto align
bool	bEnablAutoStopPeripheralRequest
	DMA hardware automatically clears the corresponding DCRn[ERQ] bit when the byte count register reaches 0. More...
bool	bEnableCycleSteal
	enable cycle steal, forces a single read/write transfer per request

Field Documentation

bool dma_channel_transfer_config_t::bEnablAutoStopPeripheralRequest

struct dma_config_t

This structure target for whole dma module configurations.

Data Fields
dma_channel_transfer_config_t *	psChannelTransferConfig [FSL_FEATURE_DMA_MODULE_CHANNEL]
	channel transfer configuration pointer

struct _dma_handle

handler for DMA

Data Fields
dma_transfer_callback_t	pfCallback
	DMA callback function. More...
void *	pUserData
	Callback function parameter. More...
DMA_Type *	psBase
	DMA peripheral base address. More...
dma_channel_t	eChannel
	DMA channel used. More...

Field Documentation

dma_transfer_callback_t dma_handle_t::pfCallback

void* dma_handle_t::pUserData

DMA_Type* dma_handle_t::psBase

dma_channel_t dma_handle_t::eChannel

Macro Definition Documentation

#define FSL_DMA_DRIVER_VERSION   (MAKE_VERSION(2, 0, 0))

Typedef Documentation

typedef void(* dma_transfer_callback_t)(dma_handle_t *psHandle, void *pUserData)

This callback function is called in the DMA interrupt handler function. In normal mode, running into callback function means the transfer users need is done.

Parameters

psHandle	DMA handle pointer, users shall not touch the values inside.
pUserData	The callback user parameter pointer. Users can use this parameter to involve things users need to change in DMA callback function.

Enumeration Type Documentation

anonymous enum

The enumerator used for transactional interface only.

Enumerator
kStatus_DMA_ChannelBusy	Channel is busy and can't handle the transfer request.

enum dma_channel_transfer_type_t

Enumerator
kDMA_ChannelTransferMemoryToMemory	Transfer type from memory to memory assume that the both source and destination address are incremental.
kDMA_ChannelTransferPeripheralToMemory	Transfer type peripher to memory assume that the source address is fixed.
kDMA_ChannelTransferMemoryToPeripheral	Transfer type from memory to peripheral assume that the destination address is fixed.

enum _dma_channel_interrupt_enable

Enumerator
kDMA_ChannelInterruptEnable	Enable interrupt while transfer complete.

enum _dma_channel_status_flags

Enumerator
kDMA_ChannelTransactionsBCRFlag	Contains the number of bytes yet to be transferred for a given block.
kDMA_ChannelTransactionsDoneFlag	Transactions Done.
kDMA_ChannelTransactionsBusyFlag	Transactions Busy.
kDMA_ChannelTransactionsRequestFlag	Transactions Request.

enum _dma_error_status_flags

Enumerator
kDMA_ChannelConfigurationErrorFlag	Any of the following conditions causes a configuration error: BCR, SAR, or DAR does not match the requested transfer size. SSIZE or DSIZE is set to an unsupported value. BCR equals 0 when the DMA receives a start condition. CE is cleared at hardware reset or by writing a 1 to DONE.
kDMA_ChannelBusErrorOnSourceFlag	BES is cleared at hardware reset or by writing a 1 to DONE.
kDMA_ChannelBusErrorOnDestinatiFlag	BED is cleared at hardware reset or by writing a 1 to DONE.

enum dma_channel_t

Enumerator
kDMA_Channel0	DMA channel 0.
kDMA_Channel1	DMA channel 1.
kDMA_Channel2	DMA channel 2.
kDMA_Channel3	DMA channel 3.

enum dma_channel_transfer_width_t

Enumerator
kDMA_ChannelTransferWidth32Bits	Source/Destination data transfer width is 4 byte every time.
kDMA_ChannelTransferWidth8Bits	Source/Destination data transfer width is 1 bytes every time.
kDMA_ChannelTransferWidth16Bits	Source/Destination data transfer width is 2 bytes every time.

enum dma_channel_modulo_t

The DMA modulo feature can be used to specify the address range of the source/destination address, it is useful to implement a circular data queue.

Enumerator
kDMA_ChannelModuloDisable	Disable modulo.
kDMA_ChannelModulo16bytes	Circular buffer size is 16 bytes.
kDMA_ChannelModulo32bytes	Circular buffer size is 32 bytes.
kDMA_ChannelModulo64bytes	Circular buffer size is 64 bytes.
kDMA_ChannelModulo128bytes	Circular buffer size is 128 bytes.
kDMA_ChannelModulo256bytes	Circular buffer size is 256 bytes.
kDMA_ChannelModulo512bytes	Circular buffer size is 512 bytes.
kDMA_ChannelModulo1Kbytes	Circular buffer size is 1 K bytes.
kDMA_ChannelModulo2Kbytes	Circular buffer size is 2 K bytes.
kDMA_ChannelModulo4Kbytes	Circular buffer size is 4 K bytes.
kDMA_ChannelModulo8Kbytes	Circular buffer size is 8 K bytes.
kDMA_ChannelModulo16Kbytes	Circular buffer size is 16 K bytes.
kDMA_ChannelModulo32Kbytes	Circular buffer size is 32 K bytes.
kDMA_ChannelModulo64Kbytes	Circular buffer size is 64 K bytes.
kDMA_ChannelModulo128Kbytes	Circular buffer size is 128 K bytes.
kDMA_ChannelModulo256Kbytes	Circular buffer size is 256 K bytes.

enum dma_channel_link_type_t

Enumerator
kDMA_ChannelLinkDisable	No channel link.
kDMA_ChannelLinkChannel1AndChannel2	Perform a link to channel LCH1 after each cycle-steal transfer. followed by a link to LCH2 after the BCR decrements to 0.
kDMA_ChannelLinkChannel1	Perform a link to LCH1 after each cycle-steal transfer.
kDMA_ChannelLinkChannel1AfterBCR0	Perform a link to LCH1 after the BCR decrements.

enum dma_channel_address_increment_type_t

Enumerator
kDMA_ChannelAddressFix	Address Fix.
kDMA_ChannelAddressIncrement	Address increment.

Function Documentation

void DMA_Init	(	DMA_Type *	base,
		dma_config_t *	psConfig
	)

Parameters

base	DMA peripheral base address.
psConfig	pointer to user's DMA configure structure, see dma_config_t for detail.

void DMA_Deinit

(

DMA_Type *

base

)

Parameters

base	DMA peripheral base address.

void DMA_ResetChannel	(	DMA_Type *	base,
		dma_channel_t	eChannel
	)

Sets all register values to reset values and enables the cycle steal and auto stop channel request features.

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.

void DMA_GetChannelDefaultTransferConfig	(	dma_channel_transfer_config_t *	psTransfer,
		uint32_t	u32SrcAddr,
		uint32_t	u32DstAddr,
		uint32_t	u32TotalBytes,
		dma_channel_transfer_width_t	eTransferWidth,
		dma_channel_transfer_type_t	eTransferType
	)

Note

1. This function will reset all of the configuration structure members to zero firstly, then apply default configurations to the structure.

1. No interrupt enabled by this function by default, if application would like to use DMA interrupt please enable it manually by psTransfer->u16EnabledInterruptMask = _dma_channel_interrupt

Parameters

psTransfer	pointer to user's DMA channel configure structure, see dma_channel_transfer_config_t for detail.
u32SrcAddr	source address, must be byte address.
u32DstAddr	destination address, must be byte address.
u32TotalBytes	total bytes to be transferred.
eTransferWidth	it represents how many bits are transferred in each read/write.
eTransferType	DMA channel transfer type.

void DMA_SetChannelTransferConfig	(	DMA_Type *	base,
		dma_channel_t	eChannel,
		dma_channel_transfer_config_t *	psTransfer
	)

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
psTransfer	pointer to user's DMA channel configure structure, see dma_channel_transfer_config_t for detail.

void DMA_SetChannelLinkConfig	(	DMA_Type *	base,
		dma_channel_t	eChannel,
		dma_channel_link_config_t *	pLinkConfig
	)

This function allows DMA channels to have their transfers linked. The current DMA channel triggers a DMA request to the linked channels (LCH1 or LCH2) depending on the channel link type. Perform a link to channel LCH1 after each cycle-steal transfer followed by a link to LCH2 after the BCR decrements to 0 if the type is kDMA_ChannelLinkChannel1AndChannel2. Perform a link to LCH1 after each cycle-steal transfer if the type is kDMA_ChannelLinkChannel1. Perform a link to LCH1 after the BCR decrements to 0 if the type is kDMA_ChannelLinkChannel1AfterBCR0.

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
pLinkConfig	Pointer to the channel link configuration structure.

static void DMA_SetChannelSourceAddress ( DMA_Type *  base, dma_channel_t  eChannel, uint32_t  u32SrcAddr  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
u32SrcAddr	DMA source address.

static void DMA_SetChannelDestinationAddress ( DMA_Type *  base, dma_channel_t  eChannel, uint32_t  u32DestAddr  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
u32DestAddr	DMA destination address.

static void DMA_SetChannelTransferSize ( DMA_Type *  base, dma_channel_t  eChannel, uint32_t  u32TransferSize  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
u32TransferSize	The number of bytes to be transferred.

void DMA_SetChannelPeripheralRequest	(	DMA_Type *	base,
		dma_channel_t	eChannel,
		dma_channel_request_source_t	eChannelRequestSource
	)

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
eChannelRequestSource	The number of request source.

void DMA_SetChannelModulo	(	DMA_Type *	base,
		dma_channel_t	eChannel,
		dma_channel_modulo_t	eSrcModulo,
		dma_channel_modulo_t	eDestModulo
	)

This function defines a specific address range of source/destination address, after the source/destination address hits the range boundary, source/destination address will wrap to origin value.

Setting this field provides the ability to implement a circular data queue easily. For data queues require loop power-of-2 size bytes, the queue should start at a 0-modulo-size address and the SMOD field should be set to the appropriate value for the queue, freezing the desired number of upper address bits. The value programmed into this field specifies the number of lower address bits allowed to change

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
eSrcModulo	A source modulo value.
eDestModulo	A destination modulo value.

static void DMA_EnableChannelCycleSteal ( DMA_Type *  base, dma_channel_t  eChannel, bool  bEnable  )

inlinestatic

If the cycle steal feature is enabled (true), the DMA controller forces a single read/write transfer per request, or it continuously makes read/write transfers until the BCR decrements to 0.

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
bEnable	The command for enable (true) or disable (false).

static void DMA_EnableChannelAutoAlign ( DMA_Type *  base, dma_channel_t  eChannel, bool  bEnable  )

inlinestatic

If the auto align feature is enabled (true), the appropriate address register increments regardless of DINC or SINC.

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
bEnable	The command for enable (true) or disable (false).

static void DMA_EnableChannelInterrupt ( DMA_Type *  base, dma_channel_t  eChannel, bool  bEnable  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.
bEnable	The command for enable (true) or disable (false).

static void DMA_EnableChannelPeripheralRequest ( DMA_Type *  base, dma_channel_t  eChannel, bool  bEnable  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	The DMA channel number.
bEnable	The command for enable (true) or disable (false).

static void DMA_TriggerChannelStart ( DMA_Type *  base, dma_channel_t  eChannel  )

inlinestatic

This function starts only one read/write iteration.

Parameters

base	DMA peripheral base address.
eChannel	The DMA channel number.

static void DMA_EnableChannelAutoStopRequest ( DMA_Type *  base, dma_channel_t  eChannel, bool  bEnable  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	The DMA channel number.
bEnable	true is enable, false is disable.

static uint32_t DMA_GetChannelRemainingBytes ( DMA_Type *  base, dma_channel_t  eChannel  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.

Returns

The number of bytes which have not been transferred yet.

static uint32_t DMA_GetChannelStatusFlags ( DMA_Type *  base, dma_channel_t  eChannel  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.

Returns

The mask of the channel status. Use the _dma_channel_status_flags type to decode the return 32 bit variables.

static void DMA_ClearChannelDoneStatus ( DMA_Type *  base, dma_channel_t  eChannel  )

inlinestatic

Parameters

base	DMA peripheral base address.
eChannel	DMA channel number.

void DMA_TransferChannelCreateHandle	(	DMA_Type *	base,
		dma_handle_t *	psHandle,
		dma_channel_t	eChannel,
		dma_transfer_callback_t	pfCallback,
		void *	pUserData
	)

This function is called first if using the transactional API for the DMA. This function initializes the internal state of the DMA handle.

Parameters

base	DMA peripheral base address.
psHandle	DMA handle pointer. The DMA handle stores callback function and parameters.
eChannel	DMA channel number.
pfCallback	DMA callback function pointer.
pUserData	A parameter for the callback function.

status_t DMA_TransferChannelSubmit	(	dma_handle_t *	psHandle,
		dma_channel_transfer_config_t *	psTransfer
	)

This function submits the DMA transfer request according to the transfer configuration structure.

Parameters

psHandle	DMA handle pointer.
psTransfer	Pointer to DMA transfer configuration structure.

Return values

kStatus_DMA_Success	It indicates that the DMA submit transfer request succeeded.
kStatus_DMA_ChannelBusy	It indicates that the DMA is busy. Submit transfer request is not allowed.

Note

This function can't process multi transfer request.

void DMA_TransferChannelStart	(	dma_handle_t *	psHandle,
		bool	bIsPeripheral
	)

This function enables the channel request. Call this function after submitting a transfer request.

Parameters

psHandle	DMA handle pointer.
bIsPeripheral	For true: enable DMA hardware request peripheral. For false: disable DMA hardware request peripheral.

void DMA_TransferChannelStop

(

dma_handle_t *

psHandle

)

This function disables the channel request to stop a DMA transfer. The transfer can be resumed by calling the DMA_StartTransfer.

Parameters

psHandle

DMA handle pointer.

void DMA_TransferChannelAbort

(

dma_handle_t *

psHandle

)

This function disables the channel request and clear transfer status bits. Users can submit another transfer after calling this API.

Parameters

psHandle

DMA handle pointer.

void DMA_TransferChannelHandleIRQ

(

dma_handle_t *

psHandle

)

This function clears the channel interrupt flag and calls the callback function if it is not NULL.

Parameters

psHandle

DMA handle pointer.