Edma

Data Structures
struct	_edma_config
	eDMA global configuration structure. More...
struct	_edma_transfer_config
	eDMA transfer configuration More...
struct	_edma_channel_Preemption_config
	eDMA channel priority configuration More...
struct	_edma_minor_offset_config
	eDMA minor offset configuration More...
struct	_edma_tcd
	eDMA TCD. More...
struct	_edma_handle
	eDMA transfer handle structure More...

Variables
bool	_edma_config::enableContinuousLinkMode
bool	_edma_config::enableHaltOnError
bool	_edma_config::enableRoundRobinArbitration
bool	_edma_config::enableDebugMode
uint32_t	_edma_transfer_config::srcAddr
uint32_t	_edma_transfer_config::destAddr
edma_transfer_size_t	_edma_transfer_config::srcTransferSize
edma_transfer_size_t	_edma_transfer_config::destTransferSize
int16_t	_edma_transfer_config::srcOffset
int16_t	_edma_transfer_config::destOffset
uint32_t	_edma_transfer_config::minorLoopBytes
uint32_t	_edma_transfer_config::majorLoopCounts
bool	_edma_channel_Preemption_config::enableChannelPreemption
bool	_edma_channel_Preemption_config::enablePreemptAbility
uint8_t	_edma_channel_Preemption_config::channelPriority
bool	_edma_minor_offset_config::enableSrcMinorOffset
bool	_edma_minor_offset_config::enableDestMinorOffset
uint32_t	_edma_minor_offset_config::minorOffset
__IO uint32_t	_edma_tcd::SADDR
__IO uint16_t	_edma_tcd::SOFF
__IO uint16_t	_edma_tcd::ATTR
__IO uint32_t	_edma_tcd::NBYTES
__IO uint32_t	_edma_tcd::SLAST
__IO uint32_t	_edma_tcd::DADDR
__IO uint16_t	_edma_tcd::DOFF
__IO uint16_t	_edma_tcd::CITER
__IO uint32_t	_edma_tcd::DLAST_SGA
__IO uint16_t	_edma_tcd::CSR
__IO uint16_t	_edma_tcd::BITER
edma_callback	_edma_handle::callback
void *	_edma_handle::userData
DMA_Type *	_edma_handle::base
edma_tcd_t *	_edma_handle::tcdPool
uint8_t	_edma_handle::channel
volatile int8_t	_edma_handle::header
volatile int8_t	_edma_handle::tail
volatile int8_t	_edma_handle::tcdUsed
volatile int8_t	_edma_handle::tcdSize
uint8_t	_edma_handle::flags

Driver version
enum	_edma_transfer_size {   kEDMA_TransferSize1Bytes = 0x0U , kEDMA_TransferSize2Bytes = 0x1U , kEDMA_TransferSize4Bytes = 0x2U , kEDMA_TransferSize8Bytes = 0x3U ,   kEDMA_TransferSize16Bytes = 0x4U , kEDMA_TransferSize32Bytes = 0x5U }
	eDMA transfer configuration More...
enum	_edma_modulo {   kEDMA_ModuloDisable = 0x0U , kEDMA_Modulo2bytes , kEDMA_Modulo4bytes , kEDMA_Modulo8bytes ,   kEDMA_Modulo16bytes , kEDMA_Modulo32bytes , kEDMA_Modulo64bytes , kEDMA_Modulo128bytes ,   kEDMA_Modulo256bytes , kEDMA_Modulo512bytes , kEDMA_Modulo1Kbytes , kEDMA_Modulo2Kbytes ,   kEDMA_Modulo4Kbytes , kEDMA_Modulo8Kbytes , kEDMA_Modulo16Kbytes , kEDMA_Modulo32Kbytes ,   kEDMA_Modulo64Kbytes , kEDMA_Modulo128Kbytes , kEDMA_Modulo256Kbytes , kEDMA_Modulo512Kbytes ,   kEDMA_Modulo1Mbytes , kEDMA_Modulo2Mbytes , kEDMA_Modulo4Mbytes , kEDMA_Modulo8Mbytes ,   kEDMA_Modulo16Mbytes , kEDMA_Modulo32Mbytes , kEDMA_Modulo64Mbytes , kEDMA_Modulo128Mbytes ,   kEDMA_Modulo256Mbytes , kEDMA_Modulo512Mbytes , kEDMA_Modulo1Gbytes , kEDMA_Modulo2Gbytes }
	eDMA modulo configuration More...
enum	_edma_bandwidth { kEDMA_BandwidthStallNone = 0x0U , kEDMA_BandwidthStall4Cycle = 0x2U , kEDMA_BandwidthStall8Cycle = 0x3U }
	Bandwidth control. More...
enum	_edma_channel_link_type { kEDMA_LinkNone = 0x0U , kEDMA_MinorLink , kEDMA_MajorLink }
	Channel link type. More...
enum	{ kEDMA_DoneFlag = 0x1U , kEDMA_ErrorFlag = 0x2U , kEDMA_InterruptFlag = 0x4U }
	_edma_channel_status_flags eDMA channel status flags. More...
enum	{   kEDMA_DestinationBusErrorFlag = DMA_ES_DBE_MASK , kEDMA_SourceBusErrorFlag = DMA_ES_SBE_MASK , kEDMA_ScatterGatherErrorFlag = DMA_ES_SGE_MASK , kEDMA_NbytesErrorFlag = DMA_ES_NCE_MASK ,   kEDMA_DestinationOffsetErrorFlag = DMA_ES_DOE_MASK , kEDMA_DestinationAddressErrorFlag = DMA_ES_DAE_MASK , kEDMA_SourceOffsetErrorFlag = DMA_ES_SOE_MASK , kEDMA_SourceAddressErrorFlag = DMA_ES_SAE_MASK ,   kEDMA_ErrorChannelFlag = DMA_ES_ERRCHN_MASK , kEDMA_ChannelPriorityErrorFlag = DMA_ES_CPE_MASK , kEDMA_TransferCanceledFlag = DMA_ES_ECX_MASK , kEDMA_ValidFlag = (int)DMA_ES_VLD_MASK }
	_edma_error_status_flags eDMA channel error status flags. More...
enum	_edma_interrupt_enable { kEDMA_ErrorInterruptEnable = 0x1U , kEDMA_MajorInterruptEnable = DMA_CSR_INTMAJOR_MASK , kEDMA_HalfInterruptEnable = DMA_CSR_INTHALF_MASK }
	eDMA interrupt source More...
enum	_edma_transfer_type { kEDMA_MemoryToMemory = 0x0U , kEDMA_PeripheralToMemory , kEDMA_MemoryToPeripheral , kEDMA_PeripheralToPeripheral }
	eDMA transfer type More...
enum	{ kStatus_EDMA_QueueFull = MAKE_STATUS(kStatusGroup_EDMA, 0) , kStatus_EDMA_Busy = MAKE_STATUS(kStatusGroup_EDMA, 1) }
	_edma_transfer_status eDMA transfer status More...
typedef enum _edma_transfer_size	edma_transfer_size_t
	eDMA transfer configuration
typedef enum _edma_modulo	edma_modulo_t
	eDMA modulo configuration
typedef enum _edma_bandwidth	edma_bandwidth_t
	Bandwidth control.
typedef enum _edma_channel_link_type	edma_channel_link_type_t
	Channel link type.
typedef enum _edma_interrupt_enable	edma_interrupt_enable_t
	eDMA interrupt source
typedef enum _edma_transfer_type	edma_transfer_type_t
	eDMA transfer type
typedef struct _edma_config	edma_config_t
	eDMA global configuration structure.
typedef struct _edma_transfer_config	edma_transfer_config_t
	eDMA transfer configuration
typedef struct _edma_channel_Preemption_config	edma_channel_Preemption_config_t
	eDMA channel priority configuration
typedef struct _edma_minor_offset_config	edma_minor_offset_config_t
	eDMA minor offset configuration
typedef struct _edma_tcd	edma_tcd_t
	eDMA TCD.
typedef void(*	edma_callback) (struct _edma_handle *handle, void *userData, bool transferDone, uint32_t tcds)
	Define callback function for eDMA.
typedef struct _edma_handle	edma_handle_t
	eDMA transfer handle structure
#define	FSL_EDMA_DRIVER_VERSION   (MAKE_VERSION(2, 4, 3))
	eDMA driver version
#define	DMA_DCHPRI_INDEX(channel)   (((channel) & ~0x03U) | (3U - ((channel)&0x03U)))
	Compute the offset unit from DCHPRI3.

eDMA initialization and de-initialization
void	EDMA_Init (DMA_Type *base, const edma_config_t *config)
	Initializes the eDMA peripheral.
void	EDMA_Deinit (DMA_Type *base)
	Deinitializes the eDMA peripheral.
void	EDMA_InstallTCD (DMA_Type *base, uint32_t channel, edma_tcd_t *tcd)
	Push content of TCD structure into hardware TCD register.
void	EDMA_GetDefaultConfig (edma_config_t *config)
	Gets the eDMA default configuration structure.

eDMA Channel Operation
void	EDMA_ResetChannel (DMA_Type *base, uint32_t channel)
	Sets all TCD registers to default values.
void	EDMA_SetTransferConfig (DMA_Type *base, uint32_t channel, const edma_transfer_config_t *config, edma_tcd_t *nextTcd)
	Configures the eDMA transfer attribute.
void	EDMA_SetMinorOffsetConfig (DMA_Type *base, uint32_t channel, const edma_minor_offset_config_t *config)
	Configures the eDMA minor offset feature.
void	EDMA_SetChannelPreemptionConfig (DMA_Type *base, uint32_t channel, const edma_channel_Preemption_config_t *config)
	Configures the eDMA channel preemption feature.
void	EDMA_SetChannelLink (DMA_Type *base, uint32_t channel, edma_channel_link_type_t linkType, uint32_t linkedChannel)
	Sets the channel link for the eDMA transfer.
void	EDMA_SetBandWidth (DMA_Type *base, uint32_t channel, edma_bandwidth_t bandWidth)
	Sets the bandwidth for the eDMA transfer.
void	EDMA_SetModulo (DMA_Type *base, uint32_t channel, edma_modulo_t srcModulo, edma_modulo_t destModulo)
	Sets the source modulo and the destination modulo for the eDMA transfer.
void	EDMA_EnableChannelInterrupts (DMA_Type *base, uint32_t channel, uint32_t mask)
	Enables the interrupt source for the eDMA transfer.
void	EDMA_DisableChannelInterrupts (DMA_Type *base, uint32_t channel, uint32_t mask)
	Disables the interrupt source for the eDMA transfer.
void	EDMA_SetMajorOffsetConfig (DMA_Type *base, uint32_t channel, int32_t sourceOffset, int32_t destOffset)
	Configures the eDMA channel TCD major offset feature.

eDMA TCD Operation
void	EDMA_TcdReset (edma_tcd_t *tcd)
	Sets all fields to default values for the TCD structure.
void	EDMA_TcdSetTransferConfig (edma_tcd_t *tcd, const edma_transfer_config_t *config, edma_tcd_t *nextTcd)
	Configures the eDMA TCD transfer attribute.
void	EDMA_TcdSetMinorOffsetConfig (edma_tcd_t *tcd, const edma_minor_offset_config_t *config)
	Configures the eDMA TCD minor offset feature.
void	EDMA_TcdSetChannelLink (edma_tcd_t *tcd, edma_channel_link_type_t linkType, uint32_t linkedChannel)
	Sets the channel link for the eDMA TCD.
void	EDMA_TcdSetModulo (edma_tcd_t *tcd, edma_modulo_t srcModulo, edma_modulo_t destModulo)
	Sets the source modulo and the destination modulo for the eDMA TCD.
void	EDMA_TcdEnableInterrupts (edma_tcd_t *tcd, uint32_t mask)
	Enables the interrupt source for the eDMA TCD.
void	EDMA_TcdDisableInterrupts (edma_tcd_t *tcd, uint32_t mask)
	Disables the interrupt source for the eDMA TCD.
void	EDMA_TcdSetMajorOffsetConfig (edma_tcd_t *tcd, int32_t sourceOffset, int32_t destOffset)
	Configures the eDMA TCD major offset feature.

eDMA Channel Status Operation
uint32_t	EDMA_GetRemainingMajorLoopCount (DMA_Type *base, uint32_t channel)
	Gets the remaining major loop count from the eDMA current channel TCD.
uint32_t	EDMA_GetChannelStatusFlags (DMA_Type *base, uint32_t channel)
	Gets the eDMA channel status flags.
void	EDMA_ClearChannelStatusFlags (DMA_Type *base, uint32_t channel, uint32_t mask)
	Clears the eDMA channel status flags.

eDMA Transactional Operation
void	EDMA_CreateHandle (edma_handle_t *handle, DMA_Type *base, uint32_t channel)
	Creates the eDMA handle.
void	EDMA_InstallTCDMemory (edma_handle_t *handle, edma_tcd_t *tcdPool, uint32_t tcdSize)
	Installs the TCDs memory pool into the eDMA handle.
void	EDMA_SetCallback (edma_handle_t *handle, edma_callback callback, void *userData)
	Installs a callback function for the eDMA transfer.
void	EDMA_PrepareTransferConfig (edma_transfer_config_t *config, void *srcAddr, uint32_t srcWidth, int16_t srcOffset, void *destAddr, uint32_t destWidth, int16_t destOffset, uint32_t bytesEachRequest, uint32_t transferBytes)
	Prepares the eDMA transfer structure configurations.
void	EDMA_PrepareTransfer (edma_transfer_config_t *config, void *srcAddr, uint32_t srcWidth, void *destAddr, uint32_t destWidth, uint32_t bytesEachRequest, uint32_t transferBytes, edma_transfer_type_t transferType)
	Prepares the eDMA transfer structure.
status_t	EDMA_SubmitTransfer (edma_handle_t *handle, const edma_transfer_config_t *config)
	Submits the eDMA transfer request.
void	EDMA_StartTransfer (edma_handle_t *handle)
	eDMA starts transfer.
void	EDMA_StopTransfer (edma_handle_t *handle)
	eDMA stops transfer.
void	EDMA_AbortTransfer (edma_handle_t *handle)
	eDMA aborts transfer.
void	EDMA_HandleIRQ (edma_handle_t *handle)
	eDMA IRQ handler for the current major loop transfer completion.

Detailed Description

Macro Definition Documentation

FSL_EDMA_DRIVER_VERSION

#define FSL_EDMA_DRIVER_VERSION   (MAKE_VERSION(2, 4, 3))

eDMA driver version

Version 2.4.3.

Typedef Documentation

edma_callback

typedef void(* edma_callback) (struct _edma_handle *handle, void *userData, bool transferDone, uint32_t tcds)

Define callback function for eDMA.

This callback function is called in the EDMA interrupt handle. In normal mode, run into callback function means the transfer users need is done. In scatter gather mode, run into callback function means a transfer control block (tcd) is finished. Not all transfer finished, users can get the finished tcd numbers using interface EDMA_GetUnusedTCDNumber.

Parameters

handle	EDMA handle pointer, users shall not touch the values inside.
userData	The callback user parameter pointer. Users can use this parameter to involve things users need to change in EDMA callback function.
transferDone	If the current loaded transfer done. In normal mode it means if all transfer done. In scatter gather mode, this parameter shows is the current transfer block in EDMA register is done. As the load of core is different, it will be different if the new tcd loaded into EDMA registers while this callback called. If true, it always means new tcd still not loaded into registers, while false means new tcd already loaded into registers.
tcds	How many tcds are done from the last callback. This parameter only used in scatter gather mode. It tells user how many tcds are finished between the last callback and this.

edma_tcd_t

typedef struct _edma_tcd edma_tcd_t

eDMA TCD.

This structure is same as TCD register which is described in reference manual, and is used to configure the scatter/gather feature as a next hardware TCD.

edma_transfer_config_t

typedef struct _edma_transfer_config edma_transfer_config_t

eDMA transfer configuration

This structure configures the source/destination transfer attribute.

Enumeration Type Documentation

anonymous enum

anonymous enum

_edma_channel_status_flags eDMA channel status flags.

Enumerator
kEDMA_DoneFlag	DONE flag, set while transfer finished, CITER value exhausted
kEDMA_ErrorFlag	eDMA error flag, an error occurred in a transfer
kEDMA_InterruptFlag	eDMA interrupt flag, set while an interrupt occurred of this channel

anonymous enum

anonymous enum

_edma_error_status_flags eDMA channel error status flags.

Enumerator
kEDMA_DestinationBusErrorFlag	Bus error on destination address
kEDMA_SourceBusErrorFlag	Bus error on the source address
kEDMA_ScatterGatherErrorFlag	Error on the Scatter/Gather address, not 32byte aligned.
kEDMA_NbytesErrorFlag	NBYTES/CITER configuration error
kEDMA_DestinationOffsetErrorFlag	Destination offset not aligned with destination size
kEDMA_DestinationAddressErrorFlag	Destination address not aligned with destination size
kEDMA_SourceOffsetErrorFlag	Source offset not aligned with source size
kEDMA_SourceAddressErrorFlag	Source address not aligned with source size
kEDMA_ErrorChannelFlag	Error channel number of the cancelled channel number
kEDMA_ChannelPriorityErrorFlag	Channel priority is not unique.
kEDMA_TransferCanceledFlag	Transfer cancelled
kEDMA_ValidFlag	No error occurred, this bit is 0. Otherwise, it is 1.

anonymous enum

anonymous enum

_edma_transfer_status eDMA transfer status

Enumerator
kStatus_EDMA_QueueFull	TCD queue is full.
kStatus_EDMA_Busy	Channel is busy and can't handle the transfer request.

_edma_bandwidth

enum _edma_bandwidth

Bandwidth control.

Enumerator
kEDMA_BandwidthStallNone	No eDMA engine stalls.
kEDMA_BandwidthStall4Cycle	eDMA engine stalls for 4 cycles after each read/write.
kEDMA_BandwidthStall8Cycle	eDMA engine stalls for 8 cycles after each read/write.

_edma_channel_link_type

enum _edma_channel_link_type

Channel link type.

Enumerator
kEDMA_LinkNone	No channel link
kEDMA_MinorLink	Channel link after each minor loop
kEDMA_MajorLink	Channel link while major loop count exhausted

_edma_interrupt_enable

enum _edma_interrupt_enable

eDMA interrupt source

Enumerator
kEDMA_ErrorInterruptEnable	Enable interrupt while channel error occurs.
kEDMA_MajorInterruptEnable	Enable interrupt while major count exhausted.
kEDMA_HalfInterruptEnable	Enable interrupt while major count to half value.

_edma_modulo

enum _edma_modulo

eDMA modulo configuration

Enumerator
kEDMA_ModuloDisable	Disable modulo
kEDMA_Modulo2bytes	Circular buffer size is 2 bytes.
kEDMA_Modulo4bytes	Circular buffer size is 4 bytes.
kEDMA_Modulo8bytes	Circular buffer size is 8 bytes.
kEDMA_Modulo16bytes	Circular buffer size is 16 bytes.
kEDMA_Modulo32bytes	Circular buffer size is 32 bytes.
kEDMA_Modulo64bytes	Circular buffer size is 64 bytes.
kEDMA_Modulo128bytes	Circular buffer size is 128 bytes.
kEDMA_Modulo256bytes	Circular buffer size is 256 bytes.
kEDMA_Modulo512bytes	Circular buffer size is 512 bytes.
kEDMA_Modulo1Kbytes	Circular buffer size is 1 K bytes.
kEDMA_Modulo2Kbytes	Circular buffer size is 2 K bytes.
kEDMA_Modulo4Kbytes	Circular buffer size is 4 K bytes.
kEDMA_Modulo8Kbytes	Circular buffer size is 8 K bytes.
kEDMA_Modulo16Kbytes	Circular buffer size is 16 K bytes.
kEDMA_Modulo32Kbytes	Circular buffer size is 32 K bytes.
kEDMA_Modulo64Kbytes	Circular buffer size is 64 K bytes.
kEDMA_Modulo128Kbytes	Circular buffer size is 128 K bytes.
kEDMA_Modulo256Kbytes	Circular buffer size is 256 K bytes.
kEDMA_Modulo512Kbytes	Circular buffer size is 512 K bytes.
kEDMA_Modulo1Mbytes	Circular buffer size is 1 M bytes.
kEDMA_Modulo2Mbytes	Circular buffer size is 2 M bytes.
kEDMA_Modulo4Mbytes	Circular buffer size is 4 M bytes.
kEDMA_Modulo8Mbytes	Circular buffer size is 8 M bytes.
kEDMA_Modulo16Mbytes	Circular buffer size is 16 M bytes.
kEDMA_Modulo32Mbytes	Circular buffer size is 32 M bytes.
kEDMA_Modulo64Mbytes	Circular buffer size is 64 M bytes.
kEDMA_Modulo128Mbytes	Circular buffer size is 128 M bytes.
kEDMA_Modulo256Mbytes	Circular buffer size is 256 M bytes.
kEDMA_Modulo512Mbytes	Circular buffer size is 512 M bytes.
kEDMA_Modulo1Gbytes	Circular buffer size is 1 G bytes.
kEDMA_Modulo2Gbytes	Circular buffer size is 2 G bytes.

_edma_transfer_size

enum _edma_transfer_size

eDMA transfer configuration

Enumerator
kEDMA_TransferSize1Bytes	Source/Destination data transfer size is 1 byte every time
kEDMA_TransferSize2Bytes	Source/Destination data transfer size is 2 bytes every time
kEDMA_TransferSize4Bytes	Source/Destination data transfer size is 4 bytes every time
kEDMA_TransferSize8Bytes	Source/Destination data transfer size is 8 bytes every time
kEDMA_TransferSize16Bytes	Source/Destination data transfer size is 16 bytes every time
kEDMA_TransferSize32Bytes	Source/Destination data transfer size is 32 bytes every time

_edma_transfer_type

enum _edma_transfer_type

eDMA transfer type

Enumerator
kEDMA_MemoryToMemory	Transfer from memory to memory
kEDMA_PeripheralToMemory	Transfer from peripheral to memory
kEDMA_MemoryToPeripheral	Transfer from memory to peripheral
kEDMA_PeripheralToPeripheral	Transfer from Peripheral to peripheral

Function Documentation

EDMA_AbortTransfer()

void EDMA_AbortTransfer

(

edma_handle_t *

handle

)

eDMA aborts transfer.

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

Parameters

handle

DMA handle pointer.

brief eDMA aborts transfer.

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

param handle DMA handle pointer.

EDMA_ClearChannelStatusFlags()

void EDMA_ClearChannelStatusFlags	(	DMA_Type *	base,
		uint32_t	channel,
		uint32_t	mask
	)

Clears the eDMA channel status flags.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
mask	The mask of channel status to be cleared. Users need to use the defined _edma_channel_status_flags type.

brief Clears the eDMA channel status flags.

param base eDMA peripheral base address. param channel eDMA channel number. param mask The mask of channel status to be cleared. Users need to use the defined _edma_channel_status_flags type.

EDMA_CreateHandle()

void EDMA_CreateHandle	(	edma_handle_t *	handle,
		DMA_Type *	base,
		uint32_t	channel
	)

Creates the eDMA handle.

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

Parameters

handle	eDMA handle pointer. The eDMA handle stores callback function and parameters.
base	eDMA peripheral base address.
channel	eDMA channel number.

brief Creates the eDMA handle.

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

param handle eDMA handle pointer. The eDMA handle stores callback function and parameters. param base eDMA peripheral base address. param channel eDMA channel number.

EDMA_Deinit()

void EDMA_Deinit

(

DMA_Type *

base

)

Deinitializes the eDMA peripheral.

This function gates the eDMA clock.

Parameters

base	eDMA peripheral base address.

brief Deinitializes the eDMA peripheral.

This function gates the eDMA clock.

param base eDMA peripheral base address.

EDMA_DisableChannelInterrupts()

void EDMA_DisableChannelInterrupts	(	DMA_Type *	base,
		uint32_t	channel,
		uint32_t	mask
	)

Disables the interrupt source for the eDMA transfer.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
mask	The mask of the interrupt source to be set. Use the defined edma_interrupt_enable_t type.

brief Disables the interrupt source for the eDMA transfer.

param base eDMA peripheral base address. param channel eDMA channel number. param mask The mask of the interrupt source to be set. Use the defined edma_interrupt_enable_t type.

EDMA_EnableChannelInterrupts()

void EDMA_EnableChannelInterrupts	(	DMA_Type *	base,
		uint32_t	channel,
		uint32_t	mask
	)

Enables the interrupt source for the eDMA transfer.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
mask	The mask of interrupt source to be set. Users need to use the defined edma_interrupt_enable_t type.

brief Enables the interrupt source for the eDMA transfer.

param base eDMA peripheral base address. param channel eDMA channel number. param mask The mask of interrupt source to be set. Users need to use the defined edma_interrupt_enable_t type.

EDMA_GetChannelStatusFlags()

uint32_t EDMA_GetChannelStatusFlags	(	DMA_Type *	base,
		uint32_t	channel
	)

Gets the eDMA channel status flags.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.

Returns

The mask of channel status flags. Users need to use the _edma_channel_status_flags type to decode the return variables.

brief Gets the eDMA channel status flags.

param base eDMA peripheral base address. param channel eDMA channel number. return The mask of channel status flags. Users need to use the _edma_channel_status_flags type to decode the return variables.

EDMA_GetDefaultConfig()

void EDMA_GetDefaultConfig

(

edma_config_t *

config

)

Gets the eDMA default configuration structure.

This function sets the configuration structure to default values. The default configuration is set to the following values.

config.enableContinuousLinkMode = false;
config.enableHaltOnError = true;
config.enableRoundRobinArbitration = false;
config.enableDebugMode = false;

Parameters

config

A pointer to the eDMA configuration structure.

brief Gets the eDMA default configuration structure.

This function sets the configuration structure to default values. The default configuration is set to the following values. code config.enableContinuousLinkMode = false; config.enableHaltOnError = true; config.enableRoundRobinArbitration = false; config.enableDebugMode = false; endcode

param config A pointer to the eDMA configuration structure.

EDMA_GetRemainingMajorLoopCount()

uint32_t EDMA_GetRemainingMajorLoopCount	(	DMA_Type *	base,
		uint32_t	channel
	)

Gets the remaining major loop count from the eDMA current channel TCD.

This function checks the TCD (Task Control Descriptor) status for a specified eDMA channel and returns the number of major loop count that has not finished.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.

Returns

Major loop count which has not been transferred yet for the current TCD.

Note

1. This function can only be used to get unfinished major loop count of transfer without the next TCD, or it might be inaccuracy.

1. The unfinished/remaining transfer bytes cannot be obtained directly from registers while the channel is running. Because to calculate the remaining bytes, the initial NBYTES configured in DMA_TCDn_NBYTES_MLNO register is needed while the eDMA IP does not support getting it while a channel is active. In another word, the NBYTES value reading is always the actual (decrementing) NBYTES value the dma_engine is working with while a channel is running. Consequently, to get the remaining transfer bytes, a software-saved initial value of NBYTES (for example copied before enabling the channel) is needed. The formula to calculate it is shown below: RemainingBytes = RemainingMajorLoopCount * NBYTES(initially configured)

brief Gets the remaining major loop count from the eDMA current channel TCD.

This function checks the TCD (Task Control Descriptor) status for a specified eDMA channel and returns the number of major loop count that has not finished.

param base eDMA peripheral base address. param channel eDMA channel number. return Major loop count which has not been transferred yet for the current TCD. note 1. This function can only be used to get unfinished major loop count of transfer without the next TCD, or it might be inaccuracy.

1. The unfinished/remaining transfer bytes cannot be obtained directly from registers while the channel is running. Because to calculate the remaining bytes, the initial NBYTES configured in DMA_TCDn_NBYTES_MLNO register is needed while the eDMA IP does not support getting it while a channel is active. In another word, the NBYTES value reading is always the actual (decrementing) NBYTES value the dma_engine is working with while a channel is running. Consequently, to get the remaining transfer bytes, a software-saved initial value of NBYTES (for example copied before enabling the channel) is needed. The formula to calculate it is shown below: RemainingBytes = RemainingMajorLoopCount * NBYTES(initially configured)

EDMA_HandleIRQ()

void EDMA_HandleIRQ

(

edma_handle_t *

handle

)

eDMA IRQ handler for the current major loop transfer completion.

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

Note: For the case using TCD queue, when the major iteration count is exhausted, additional operations are performed. These include the final address adjustments and reloading of the BITER field into the CITER. Assertion of an optional interrupt request also occurs at this time, as does a possible fetch of a new TCD from memory using the scatter/gather address pointer included in the descriptor (if scatter/gather is enabled).

For instance, when the time interrupt of TCD[0] happens, the TCD[1] has already been loaded into the eDMA engine. As sga and sga_index are calculated based on the DLAST_SGA bitfield lies in the TCD_CSR register, the sga_index in this case should be 2 (DLAST_SGA of TCD[1] stores the address of TCD[2]). Thus, the "tcdUsed" updated should be (tcdUsed - 2U) which indicates the number of TCDs can be loaded in the memory pool (because TCD[0] and TCD[1] have been loaded into the eDMA engine at this point already.).

For the last two continuous ISRs in a scatter/gather process, they both load the last TCD (The last ISR does not load a new TCD) from the memory pool to the eDMA engine when major loop completes. Therefore, ensure that the header and tcdUsed updated are identical for them. tcdUsed are both 0 in this case as no TCD to be loaded.

See the "eDMA basic data flow" in the eDMA Functional description section of the Reference Manual for further details.

Parameters

handle

eDMA handle pointer.

brief eDMA IRQ handler for the current major loop transfer completion.

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

Note: For the case using TCD queue, when the major iteration count is exhausted, additional operations are performed. These include the final address adjustments and reloading of the BITER field into the CITER. Assertion of an optional interrupt request also occurs at this time, as does a possible fetch of a new TCD from memory using the scatter/gather address pointer included in the descriptor (if scatter/gather is enabled).

For instance, when the time interrupt of TCD[0] happens, the TCD[1] has already been loaded into the eDMA engine. As sga and sga_index are calculated based on the DLAST_SGA bitfield lies in the TCD_CSR register, the sga_index in this case should be 2 (DLAST_SGA of TCD[1] stores the address of TCD[2]). Thus, the "tcdUsed" updated should be (tcdUsed - 2U) which indicates the number of TCDs can be loaded in the memory pool (because TCD[0] and TCD[1] have been loaded into the eDMA engine at this point already.).

For the last two continuous ISRs in a scatter/gather process, they both load the last TCD (The last ISR does not load a new TCD) from the memory pool to the eDMA engine when major loop completes. Therefore, ensure that the header and tcdUsed updated are identical for them. tcdUsed are both 0 in this case as no TCD to be loaded.

See the "eDMA basic data flow" in the eDMA Functional description section of the Reference Manual for further details.

param handle eDMA handle pointer.

EDMA_Init()

void EDMA_Init	(	DMA_Type *	base,
		const edma_config_t *	config
	)

Initializes the eDMA peripheral.

This function ungates the eDMA clock and configures the eDMA peripheral according to the configuration structure.

Parameters

base	eDMA peripheral base address.
config	A pointer to the configuration structure, see "edma_config_t".

Note

This function enables the minor loop map feature.

brief Initializes the eDMA peripheral.

This function ungates the eDMA clock and configures the eDMA peripheral according to the configuration structure.

param base eDMA peripheral base address. param config A pointer to the configuration structure, see "edma_config_t". note This function enables the minor loop map feature.

EDMA_InstallTCD()

void EDMA_InstallTCD	(	DMA_Type *	base,
		uint32_t	channel,
		edma_tcd_t *	tcd
	)

Push content of TCD structure into hardware TCD register.

Parameters

base	EDMA peripheral base address.
channel	EDMA channel number.
tcd	Point to TCD structure.

brief Push content of TCD structure into hardware TCD register.

param base EDMA peripheral base address. param channel EDMA channel number. param tcd Point to TCD structure.

EDMA_InstallTCDMemory()

void EDMA_InstallTCDMemory	(	edma_handle_t *	handle,
		edma_tcd_t *	tcdPool,
		uint32_t	tcdSize
	)

Installs the TCDs memory pool into the eDMA handle.

This function is called after the EDMA_CreateHandle to use scatter/gather feature. This function shall only be used while users need to use scatter gather mode. Scatter gather mode enables EDMA to load a new transfer control block (tcd) in hardware, and automatically reconfigure that DMA channel for a new transfer. Users need to prepare tcd memory and also configure tcds using interface EDMA_SubmitTransfer.

Parameters

handle	eDMA handle pointer.
tcdPool	A memory pool to store TCDs. It must be 32 bytes aligned.
tcdSize	The number of TCD slots.

brief Installs the TCDs memory pool into the eDMA handle.

This function is called after the EDMA_CreateHandle to use scatter/gather feature. This function shall only be used while users need to use scatter gather mode. Scatter gather mode enables EDMA to load a new transfer control block (tcd) in hardware, and automatically reconfigure that DMA channel for a new transfer. Users need to prepare tcd memory and also configure tcds using interface EDMA_SubmitTransfer.

param handle eDMA handle pointer. param tcdPool A memory pool to store TCDs. It must be 32 bytes aligned. param tcdSize The number of TCD slots.

EDMA_PrepareTransfer()

void EDMA_PrepareTransfer	(	edma_transfer_config_t *	config,
		void *	srcAddr,
		uint32_t	srcWidth,
		void *	destAddr,
		uint32_t	destWidth,
		uint32_t	bytesEachRequest,
		uint32_t	transferBytes,
		edma_transfer_type_t	transferType
	)

Prepares the eDMA transfer structure.

This function prepares the transfer configuration structure according to the user input.

Parameters

config	The user configuration structure of type edma_transfer_t.
srcAddr	eDMA transfer source address.
srcWidth	eDMA transfer source address width(bytes).
destAddr	eDMA transfer destination address.
destWidth	eDMA transfer destination address width(bytes).
bytesEachRequest	eDMA transfer bytes per channel request.
transferBytes	eDMA transfer bytes to be transferred.
transferType	eDMA transfer type.

Note

The data address and the data width must be consistent. For example, if the SRC is 4 bytes, the source address must be 4 bytes aligned, or it results in source address error (SAE).

brief Prepares the eDMA transfer structure.

This function prepares the transfer configuration structure according to the user input.

param config The user configuration structure of type edma_transfer_t. param srcAddr eDMA transfer source address. param srcWidth eDMA transfer source address width(bytes). param destAddr eDMA transfer destination address. param destWidth eDMA transfer destination address width(bytes). param bytesEachRequest eDMA transfer bytes per channel request. param transferBytes eDMA transfer bytes to be transferred. param transferType eDMA transfer type. note The data address and the data width must be consistent. For example, if the SRC is 4 bytes, the source address must be 4 bytes aligned, or it results in source address error (SAE).

EDMA_PrepareTransferConfig()

void EDMA_PrepareTransferConfig	(	edma_transfer_config_t *	config,
		void *	srcAddr,
		uint32_t	srcWidth,
		int16_t	srcOffset,
		void *	destAddr,
		uint32_t	destWidth,
		int16_t	destOffset,
		uint32_t	bytesEachRequest,
		uint32_t	transferBytes
	)

Prepares the eDMA transfer structure configurations.

This function prepares the transfer configuration structure according to the user input.

Parameters

config	The user configuration structure of type edma_transfer_t.
srcAddr	eDMA transfer source address.
srcWidth	eDMA transfer source address width(bytes).
srcOffset	source address offset.
destAddr	eDMA transfer destination address.
destWidth	eDMA transfer destination address width(bytes).
destOffset	destination address offset.
bytesEachRequest	eDMA transfer bytes per channel request.
transferBytes	eDMA transfer bytes to be transferred.

Note

The data address and the data width must be consistent. For example, if the SRC is 4 bytes, the source address must be 4 bytes aligned, or it results in source address error (SAE).

brief Prepares the eDMA transfer structure configurations.

This function prepares the transfer configuration structure according to the user input.

param config The user configuration structure of type edma_transfer_t. param srcAddr eDMA transfer source address. param srcWidth eDMA transfer source address width(bytes). param srcOffset source address offset. param destAddr eDMA transfer destination address. param destWidth eDMA transfer destination address width(bytes). param destOffset destination address offset. param bytesEachRequest eDMA transfer bytes per channel request. param transferBytes eDMA transfer bytes to be transferred. note The data address and the data width must be consistent. For example, if the SRC is 4 bytes, the source address must be 4 bytes aligned, or it results in source address error (SAE).

EDMA_ResetChannel()

void EDMA_ResetChannel	(	DMA_Type *	base,
		uint32_t	channel
	)

Sets all TCD registers to default values.

This function sets TCD registers for this channel to default values.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.

Note

This function must not be called while the channel transfer is ongoing or it causes unpredictable results.

This function enables the auto stop request feature.

brief Sets all TCD registers to default values.

This function sets TCD registers for this channel to default values.

param base eDMA peripheral base address. param channel eDMA channel number. note This function must not be called while the channel transfer is ongoing or it causes unpredictable results. note This function enables the auto stop request feature.

EDMA_SetBandWidth()

void EDMA_SetBandWidth	(	DMA_Type *	base,
		uint32_t	channel,
		edma_bandwidth_t	bandWidth
	)

Sets the bandwidth for the eDMA transfer.

Because the eDMA processes the minor loop, it continuously generates read/write sequences until the minor count is exhausted. The bandwidth forces the eDMA to stall after the completion of each read/write access to control the bus request bandwidth seen by the crossbar switch.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
bandWidth	A bandwidth setting, which can be one of the following: kEDMABandwidthStallNone kEDMABandwidthStall4Cycle kEDMABandwidthStall8Cycle brief Sets the bandwidth for the eDMA transfer.

Because the eDMA processes the minor loop, it continuously generates read/write sequences until the minor count is exhausted. The bandwidth forces the eDMA to stall after the completion of each read/write access to control the bus request bandwidth seen by the crossbar switch.

param base eDMA peripheral base address. param channel eDMA channel number. param bandWidth A bandwidth setting, which can be one of the following: arg kEDMABandwidthStallNone arg kEDMABandwidthStall4Cycle arg kEDMABandwidthStall8Cycle

EDMA_SetCallback()

void EDMA_SetCallback	(	edma_handle_t *	handle,
		edma_callback	callback,
		void *	userData
	)

Installs a callback function for the eDMA transfer.

This callback is called in the eDMA IRQ handler. Use the callback to do something after the current major loop transfer completes. This function will be called every time one tcd finished transfer.

Parameters

handle	eDMA handle pointer.
callback	eDMA callback function pointer.
userData	A parameter for the callback function.

brief Installs a callback function for the eDMA transfer.

This callback is called in the eDMA IRQ handler. Use the callback to do something after the current major loop transfer completes. This function will be called every time one tcd finished transfer.

param handle eDMA handle pointer. param callback eDMA callback function pointer. param userData A parameter for the callback function.

EDMA_SetChannelLink()

void EDMA_SetChannelLink	(	DMA_Type *	base,
		uint32_t	channel,
		edma_channel_link_type_t	linkType,
		uint32_t	linkedChannel
	)

Sets the channel link for the eDMA transfer.

This function configures either the minor link or the major link mode. The minor link means that the channel link is triggered every time CITER decreases by 1. The major link means that the channel link is triggered when the CITER is exhausted.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
linkType	A channel link type, which can be one of the following: kEDMA_LinkNone kEDMA_MinorLink kEDMA_MajorLink
linkedChannel	The linked channel number.

Note

Users should ensure that DONE flag is cleared before calling this interface, or the configuration is invalid.

brief Sets the channel link for the eDMA transfer.

This function configures either the minor link or the major link mode. The minor link means that the channel link is triggered every time CITER decreases by 1. The major link means that the channel link is triggered when the CITER is exhausted.

param base eDMA peripheral base address. param channel eDMA channel number. param linkType A channel link type, which can be one of the following: arg kEDMA_LinkNone arg kEDMA_MinorLink arg kEDMA_MajorLink param linkedChannel The linked channel number. note Users should ensure that DONE flag is cleared before calling this interface, or the configuration is invalid.

EDMA_SetChannelPreemptionConfig()

void EDMA_SetChannelPreemptionConfig	(	DMA_Type *	base,
		uint32_t	channel,
		const edma_channel_Preemption_config_t *	config
	)

Configures the eDMA channel preemption feature.

This function configures the channel preemption attribute and the priority of the channel.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number
config	A pointer to the channel preemption configuration structure.

brief Configures the eDMA channel preemption feature.

This function configures the channel preemption attribute and the priority of the channel.

param base eDMA peripheral base address. param channel eDMA channel number param config A pointer to the channel preemption configuration structure.

EDMA_SetMajorOffsetConfig()

void EDMA_SetMajorOffsetConfig	(	DMA_Type *	base,
		uint32_t	channel,
		int32_t	sourceOffset,
		int32_t	destOffset
	)

Configures the eDMA channel TCD major offset feature.

Adjustment value added to the source address at the completion of the major iteration count

Parameters

base	eDMA peripheral base address.
channel	edma channel number.
sourceOffset	source address offset will be applied to source address after major loop done.
destOffset	destination address offset will be applied to source address after major loop done.

brief Configures the eDMA channel TCD major offset feature.

Adjustment value added to the source address at the completion of the major iteration count

param base eDMA peripheral base address. param channel edma channel number. param sourceOffset source address offset. param destOffset destination address offset.

EDMA_SetMinorOffsetConfig()

void EDMA_SetMinorOffsetConfig	(	DMA_Type *	base,
		uint32_t	channel,
		const edma_minor_offset_config_t *	config
	)

Configures the eDMA minor offset feature.

The minor offset means that the signed-extended value is added to the source address or destination address after each minor loop.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
config	A pointer to the minor offset configuration structure.

brief Configures the eDMA minor offset feature.

The minor offset means that the signed-extended value is added to the source address or destination address after each minor loop.

param base eDMA peripheral base address. param channel eDMA channel number. param config A pointer to the minor offset configuration structure.

EDMA_SetModulo()

void EDMA_SetModulo	(	DMA_Type *	base,
		uint32_t	channel,
		edma_modulo_t	srcModulo,
		edma_modulo_t	destModulo
	)

Sets the source modulo and the destination modulo for the eDMA transfer.

This function defines a specific address range specified to be the value after (SADDR + SOFF)/(DADDR + DOFF) calculation is performed or the original register value. It provides the ability to implement a circular data queue easily.

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
srcModulo	A source modulo value.
destModulo	A destination modulo value.

brief Sets the source modulo and the destination modulo for the eDMA transfer.

This function defines a specific address range specified to be the value after (SADDR + SOFF)/(DADDR + DOFF) calculation is performed or the original register value. It provides the ability to implement a circular data queue easily.

param base eDMA peripheral base address. param channel eDMA channel number. param srcModulo A source modulo value. param destModulo A destination modulo value.

EDMA_SetTransferConfig()

void EDMA_SetTransferConfig	(	DMA_Type *	base,
		uint32_t	channel,
		const edma_transfer_config_t *	config,
		edma_tcd_t *	nextTcd
	)

Configures the eDMA transfer attribute.

This function configures the transfer attribute, including source address, destination address, transfer size, address offset, and so on. It also configures the scatter gather feature if the user supplies the TCD address. Example:

edma_transfer_t config;
edma_tcd_t tcd;
config.srcAddr = ..;
config.destAddr = ..;
...
EDMA_SetTransferConfig(DMA0, channel, &config, &stcd);

Parameters

base	eDMA peripheral base address.
channel	eDMA channel number.
config	Pointer to eDMA transfer configuration structure.
nextTcd	Point to TCD structure. It can be NULL if users do not want to enable scatter/gather feature.

Note

If nextTcd is not NULL, it means scatter gather feature is enabled and DREQ bit is cleared in the previous transfer configuration, which is set in the eDMA_ResetChannel.

brief Configures the eDMA transfer attribute.

This function configures the transfer attribute, including source address, destination address, transfer size, address offset, and so on. It also configures the scatter gather feature if the user supplies the TCD address. Example: code edma_transfer_t config; edma_tcd_t tcd; config.srcAddr = ..; config.destAddr = ..; ... EDMA_SetTransferConfig(DMA0, channel, &config, &stcd); endcode

param base eDMA peripheral base address. param channel eDMA channel number. param config Pointer to eDMA transfer configuration structure. param nextTcd Point to TCD structure. It can be NULL if users do not want to enable scatter/gather feature. note If nextTcd is not NULL, it means scatter gather feature is enabled and DREQ bit is cleared in the previous transfer configuration, which is set in the eDMA_ResetChannel.

EDMA_StartTransfer()

void EDMA_StartTransfer

(

edma_handle_t *

handle

)

eDMA starts transfer.

This function enables the channel request. Users can call this function after submitting the transfer request or before submitting the transfer request.

Parameters

handle

eDMA handle pointer.

brief eDMA starts transfer.

This function enables the channel request. Users can call this function after submitting the transfer request or before submitting the transfer request.

param handle eDMA handle pointer.

EDMA_StopTransfer()

void EDMA_StopTransfer

(

edma_handle_t *

handle

)

eDMA stops transfer.

This function disables the channel request to pause the transfer. Users can call EDMA_StartTransfer() again to resume the transfer.

Parameters

handle

eDMA handle pointer.

brief eDMA stops transfer.

This function disables the channel request to pause the transfer. Users can call EDMA_StartTransfer() again to resume the transfer.

param handle eDMA handle pointer.

EDMA_SubmitTransfer()

status_t EDMA_SubmitTransfer	(	edma_handle_t *	handle,
		const edma_transfer_config_t *	config
	)

Submits the eDMA transfer request.

This function submits the eDMA transfer request according to the transfer configuration structure. In scatter gather mode, call this function will add a configured tcd to the circular list of tcd pool. The tcd pools is setup by call function EDMA_InstallTCDMemory before.

Parameters

handle	eDMA handle pointer.
config	Pointer to eDMA transfer configuration structure.

Return values

kStatus_EDMA_Success	It means submit transfer request succeed.
kStatus_EDMA_QueueFull	It means TCD queue is full. Submit transfer request is not allowed.
kStatus_EDMA_Busy	It means the given channel is busy, need to submit request later.

brief Submits the eDMA transfer request.

This function submits the eDMA transfer request according to the transfer configuration structure. In scatter gather mode, call this function will add a configured tcd to the circular list of tcd pool. The tcd pools is setup by call function EDMA_InstallTCDMemory before.

param handle eDMA handle pointer. param config Pointer to eDMA transfer configuration structure. retval kStatus_EDMA_Success It means submit transfer request succeed. retval kStatus_EDMA_QueueFull It means TCD queue is full. Submit transfer request is not allowed. retval kStatus_EDMA_Busy It means the given channel is busy, need to submit request later.

EDMA_TcdDisableInterrupts()

void EDMA_TcdDisableInterrupts	(	edma_tcd_t *	tcd,
		uint32_t	mask
	)

Disables the interrupt source for the eDMA TCD.

Parameters

tcd	Point to the TCD structure.
mask	The mask of interrupt source to be set. Users need to use the defined edma_interrupt_enable_t type.

brief Disables the interrupt source for the eDMA TCD.

param tcd Point to the TCD structure. param mask The mask of interrupt source to be set. Users need to use the defined edma_interrupt_enable_t type.

EDMA_TcdEnableInterrupts()

void EDMA_TcdEnableInterrupts	(	edma_tcd_t *	tcd,
		uint32_t	mask
	)

Enables the interrupt source for the eDMA TCD.

Parameters

tcd	Point to the TCD structure.
mask	The mask of interrupt source to be set. Users need to use the defined edma_interrupt_enable_t type.

brief Enables the interrupt source for the eDMA TCD.

param tcd Point to the TCD structure. param mask The mask of interrupt source to be set. Users need to use the defined edma_interrupt_enable_t type.

EDMA_TcdReset()

void EDMA_TcdReset

(

edma_tcd_t *

tcd

)

Sets all fields to default values for the TCD structure.

This function sets all fields for this TCD structure to default value.

Parameters

tcd	Pointer to the TCD structure.

Note

This function enables the auto stop request feature.

brief Sets all fields to default values for the TCD structure.

This function sets all fields for this TCD structure to default value.

param tcd Pointer to the TCD structure. note This function enables the auto stop request feature.

EDMA_TcdSetChannelLink()

void EDMA_TcdSetChannelLink	(	edma_tcd_t *	tcd,
		edma_channel_link_type_t	linkType,
		uint32_t	linkedChannel
	)

Sets the channel link for the eDMA TCD.

This function configures either a minor link or a major link. The minor link means the channel link is triggered every time CITER decreases by 1. The major link means that the channel link is triggered when the CITER is exhausted.

Note

Users should ensure that DONE flag is cleared before calling this interface, or the configuration is invalid.

Parameters

tcd	Point to the TCD structure.
linkType	Channel link type, it can be one of: kEDMA_LinkNone kEDMA_MinorLink kEDMA_MajorLink
linkedChannel	The linked channel number.

brief Sets the channel link for the eDMA TCD.

This function configures either a minor link or a major link. The minor link means the channel link is triggered every time CITER decreases by 1. The major link means that the channel link is triggered when the CITER is exhausted.

note Users should ensure that DONE flag is cleared before calling this interface, or the configuration is invalid. param tcd Point to the TCD structure. param linkType Channel link type, it can be one of: arg kEDMA_LinkNone arg kEDMA_MinorLink arg kEDMA_MajorLink param linkedChannel The linked channel number.

EDMA_TcdSetMajorOffsetConfig()

void EDMA_TcdSetMajorOffsetConfig	(	edma_tcd_t *	tcd,
		int32_t	sourceOffset,
		int32_t	destOffset
	)

Configures the eDMA TCD major offset feature.

Adjustment value added to the source address at the completion of the major iteration count

Parameters

tcd	A point to the TCD structure.
sourceOffset	source address offset wiil be applied to source address after major loop done.
destOffset	destination address offset will be applied to source address after major loop done.

brief Configures the eDMA TCD major offset feature.

Adjustment value added to the source address at the completion of the major iteration count

param tcd A point to the TCD structure. param sourceOffset source address offset. param destOffset destination address offset.

EDMA_TcdSetMinorOffsetConfig()

void EDMA_TcdSetMinorOffsetConfig	(	edma_tcd_t *	tcd,
		const edma_minor_offset_config_t *	config
	)

Configures the eDMA TCD minor offset feature.

A minor offset is a signed-extended value added to the source address or a destination address after each minor loop.

Parameters

tcd	A point to the TCD structure.
config	A pointer to the minor offset configuration structure.

brief Configures the eDMA TCD minor offset feature.

A minor offset is a signed-extended value added to the source address or a destination address after each minor loop.

param tcd A point to the TCD structure. param config A pointer to the minor offset configuration structure.

EDMA_TcdSetModulo()

void EDMA_TcdSetModulo	(	edma_tcd_t *	tcd,
		edma_modulo_t	srcModulo,
		edma_modulo_t	destModulo
	)

Sets the source modulo and the destination modulo for the eDMA TCD.

This function defines a specific address range specified to be the value after (SADDR + SOFF)/(DADDR + DOFF) calculation is performed or the original register value. It provides the ability to implement a circular data queue easily.

Parameters

tcd	A pointer to the TCD structure.
srcModulo	A source modulo value.
destModulo	A destination modulo value.

brief Sets the source modulo and the destination modulo for the eDMA TCD.

This function defines a specific address range specified to be the value after (SADDR + SOFF)/(DADDR + DOFF) calculation is performed or the original register value. It provides the ability to implement a circular data queue easily.

param tcd A pointer to the TCD structure. param srcModulo A source modulo value. param destModulo A destination modulo value.

EDMA_TcdSetTransferConfig()

void EDMA_TcdSetTransferConfig	(	edma_tcd_t *	tcd,
		const edma_transfer_config_t *	config,
		edma_tcd_t *	nextTcd
	)

Configures the eDMA TCD transfer attribute.

The TCD is a transfer control descriptor. The content of the TCD is the same as the hardware TCD registers. The TCD is used in the scatter-gather mode. This function configures the TCD transfer attribute, including source address, destination address, transfer size, address offset, and so on. It also configures the scatter gather feature if the user supplies the next TCD address. Example:

edma_transfer_t config = {
...
}
edma_tcd_t tcd __aligned(32);
edma_tcd_t nextTcd __aligned(32);
EDMA_TcdSetTransferConfig(&tcd, &config, &nextTcd);

Parameters

tcd	Pointer to the TCD structure.
config	Pointer to eDMA transfer configuration structure.
nextTcd	Pointer to the next TCD structure. It can be NULL if users do not want to enable scatter/gather feature.

Note

TCD address should be 32 bytes aligned or it causes an eDMA error.

If the nextTcd is not NULL, the scatter gather feature is enabled and DREQ bit is cleared in the previous transfer configuration, which is set in the EDMA_TcdReset.

brief Configures the eDMA TCD transfer attribute.

The TCD is a transfer control descriptor. The content of the TCD is the same as the hardware TCD registers. The TCD is used in the scatter-gather mode. This function configures the TCD transfer attribute, including source address, destination address, transfer size, address offset, and so on. It also configures the scatter gather feature if the user supplies the next TCD address. Example: code edma_transfer_t config = { ... } edma_tcd_t tcd __aligned(32); edma_tcd_t nextTcd __aligned(32); EDMA_TcdSetTransferConfig(&tcd, &config, &nextTcd); endcode

param tcd Pointer to the TCD structure. param config Pointer to eDMA transfer configuration structure. param nextTcd Pointer to the next TCD structure. It can be NULL if users do not want to enable scatter/gather feature. note TCD address should be 32 bytes aligned or it causes an eDMA error. note If the nextTcd is not NULL, the scatter gather feature is enabled and DREQ bit is cleared in the previous transfer configuration, which is set in the EDMA_TcdReset.

Variable Documentation

ATTR

__IO uint16_t _edma_tcd::ATTR

ATTR register, source/destination transfer size and modulo

base

DMA_Type* _edma_handle::base

eDMA peripheral base address.

BITER

__IO uint16_t _edma_tcd::BITER

BITER register, begin minor loop count.

callback

edma_callback _edma_handle::callback

Callback function for major count exhausted.

channel

uint8_t _edma_handle::channel

eDMA channel number.

channelPriority

uint8_t _edma_channel_Preemption_config::channelPriority

Channel priority

CITER

__IO uint16_t _edma_tcd::CITER

CITER register, current minor loop numbers, for unfinished minor loop.

CSR

__IO uint16_t _edma_tcd::CSR

CSR register, for TCD control status

DADDR

__IO uint32_t _edma_tcd::DADDR

DADDR register, used for destination address

destAddr

uint32_t _edma_transfer_config::destAddr

Destination data address.

destOffset

int16_t _edma_transfer_config::destOffset

Sign-extended offset applied to the current destination address to form the next-state value as each destination write is completed.

destTransferSize

edma_transfer_size_t _edma_transfer_config::destTransferSize

Destination data transfer size.

DLAST_SGA

__IO uint32_t _edma_tcd::DLAST_SGA

DLASTSGA register, next tcd address used in scatter-gather mode

DOFF

__IO uint16_t _edma_tcd::DOFF

DOFF register, used for destination offset

enableChannelPreemption

bool _edma_channel_Preemption_config::enableChannelPreemption

If true: a channel can be suspended by other channel with higher priority

enableContinuousLinkMode

bool _edma_config::enableContinuousLinkMode

Enable (true) continuous link mode. Upon minor loop completion, the channel activates again if that channel has a minor loop channel link enabled and the link channel is itself.

enableDebugMode

bool _edma_config::enableDebugMode

Enable(true) eDMA debug mode. When in debug mode, the eDMA stalls the start of a new channel. Executing channels are allowed to complete.

enableDestMinorOffset

bool _edma_minor_offset_config::enableDestMinorOffset

Enable(true) or Disable(false) destination minor loop offset.

enableHaltOnError

bool _edma_config::enableHaltOnError

Enable (true) transfer halt on error. Any error causes the HALT bit to set. Subsequently, all service requests are ignored until the HALT bit is cleared.

enablePreemptAbility

bool _edma_channel_Preemption_config::enablePreemptAbility

If true: a channel can suspend other channel with low priority

enableRoundRobinArbitration

bool _edma_config::enableRoundRobinArbitration

Enable (true) round robin channel arbitration method or fixed priority arbitration is used for channel selection

enableSrcMinorOffset

bool _edma_minor_offset_config::enableSrcMinorOffset

Enable(true) or Disable(false) source minor loop offset.

flags

uint8_t _edma_handle::flags

The status of the current channel.

header

volatile int8_t _edma_handle::header

The first TCD index. Should point to the next TCD to be loaded into the eDMA engine.

majorLoopCounts

uint32_t _edma_transfer_config::majorLoopCounts

Major loop iteration count.

minorLoopBytes

uint32_t _edma_transfer_config::minorLoopBytes

Bytes to transfer in a minor loop

minorOffset

uint32_t _edma_minor_offset_config::minorOffset

Offset for a minor loop mapping.

NBYTES

__IO uint32_t _edma_tcd::NBYTES

Nbytes register, minor loop length in bytes

SADDR

__IO uint32_t _edma_tcd::SADDR

SADDR register, used to save source address

SLAST

__IO uint32_t _edma_tcd::SLAST

SLAST register

SOFF

__IO uint16_t _edma_tcd::SOFF

SOFF register, save offset bytes every transfer

srcAddr

uint32_t _edma_transfer_config::srcAddr

Source data address.

srcOffset

int16_t _edma_transfer_config::srcOffset

Sign-extended offset applied to the current source address to form the next-state value as each source read is completed.

srcTransferSize

edma_transfer_size_t _edma_transfer_config::srcTransferSize

Source data transfer size.

tail

volatile int8_t _edma_handle::tail

The last TCD index. Should point to the next TCD to be stored into the memory pool.

tcdPool

edma_tcd_t* _edma_handle::tcdPool

Pointer to memory stored TCDs.

tcdSize

volatile int8_t _edma_handle::tcdSize

The total number of TCD slots in the queue.

tcdUsed

volatile int8_t _edma_handle::tcdUsed

The number of used TCD slots. Should reflect the number of TCDs can be used/loaded in the memory.

userData

void* _edma_handle::userData

Callback function parameter.