Overview

Data Structures
struct	asrc_data_format_t
	asrc context data format More...

struct	asrc_access_ctrl_t
	asrc context access control The ASRC provides interleaving support in hardware to ensure that a variety of sample source can be internally combined tp confir with this format. More...

struct	asrc_context_input_config_t
	asrc context input configuration More...

struct	asrc_context_output_config_t
	asrc context output configuration More...

struct	asrc_context_prefilter_config_t
	asrc context prefilter configuration More...

struct	asrc_context_resampler_config_t
	asrc context resampler configuration More...

struct	asrc_context_config_t
	asrc context configuration More...

struct	asrc_transfer_t
	ASRC transfer. More...

Macros
#define	FSL_ASRC_INPUT_FIFO_DEPTH (128U)
	ASRC fifo depth.

#define	ASRC_SUPPORT_MAXIMUM_CONTEXT_PROCESSOR_NUMBER 4U
	ASRC support maximum channel number of context.

Enumerations
enum	_asrc_status { kStatus_ASRCIdle = MAKE_STATUS(kStatusGroup_ASRC, 0), kStatus_ASRCBusy = MAKE_STATUS(kStatusGroup_ASRC, 1), kStatus_ASRCInvalidArgument = MAKE_STATUS(kStatusGroup_ASRC, 2), kStatus_ASRCConfigureFailed = MAKE_STATUS(kStatusGroup_ASRC, 3), kStatus_ASRCConvertError = MAKE_STATUS(kStatusGroup_ASRC, 4), kStatus_ASRCNotSupport = MAKE_STATUS(kStatusGroup_ASRC, 5), kStatus_ASRCQueueFull = MAKE_STATUS(kStatusGroup_ASRC, 6), kStatus_ASRCQueueIdle = MAKE_STATUS(kStatusGroup_ASRC, 7), kStatus_ASRCLoadFirmwareFailed = MAKE_STATUS(kStatusGroup_ASRC, 8), kStatus_ASRCResamplerConfigureFailed = MAKE_STATUS(kStatusGroup_ASRC, 9), kStatus_ASRCPrefilterConfigureFailed = MAKE_STATUS(kStatusGroup_ASRC, 10) }
	ASRC return status. More...

enum	asrc_context_t { kASRC_Context0 = 0, kASRC_Context1 = 1, kASRC_Context2 = 2, kASRC_Context3 = 3 }
	asrc context id More...

enum	_asrc_interrupt_mask { kASRC_Context0InputFifoOverflow = 1U, kASRC_Context1InputFifoOverflow = 1U << 1U, kASRC_Context2InputFifoOverflow = 1U << 2U, kASRC_Context3InputFifoOverflow = 1U << 3U, kASRC_Context0OutFifoReadEmpty = 1U << 4U, kASRC_Context1OutFifoReadEmpty = 1U << 5U, kASRC_Context2OutFifoReadEmpty = 1U << 6U, kASRC_Context3OutFifoReadEmpty = 1U << 7U, kASRC_Context0RunStopDone = 1U << 8U, kASRC_Context1RunStopDone = 1U << 9U, kASRC_Context2RunStopDone = 1U << 10U, kASRC_Context3RunStopDone = 1U << 11U, kASRC_ContextAllInterruptStatus = 0xFFFU }
	The ASRC interrupt enable flag. More...

enum	_asrc_fifo_status { kASRC_FifoStatusInputFifoWatermarkFlag, kASRC_FifoStatusOutputFifoWatermarkFlag }
	ASRC fifo status. More...

enum	asrc_data_endianness_t { kASRC_DataEndianLittle = 0U, kASRC_DataEndianBig = 1U }
	arsc data endianness More...

enum	asrc_data_width_t { kASRC_DataWidth32Bit = 3U, kASRC_DataWidth24Bit = 2U, kASRC_DataWidth20Bit = 1U, kASRC_DataWidth16Bit = 0U }
	data width More...

enum	asrc_data_type_t { kASRC_DataTypeInteger = 0U, kASRC_DataTypeFloat = 1U }
	data type More...

enum	asrc_data_sign_t { kASRC_DataSigned = 0U, kASRC_DataUnsigned = 1U }
	sign extension More...

enum	asrc_sampleBuffer_init_mode_t { kASRC_SampleBufferNoPreFillOnInit = 0U, kASRC_SampleBufferFillFirstSampleOnInit, kASRC_SampleBufferFillZeroOnInit = 2U }
	asrc prefilter and resampler sample buffer init mode More...

enum	asrc_sampleBuffer_stop_mode_t { kASRC_SampleBufferFillLastSampleOnStop, kASRC_SampleBufferFillZeroOnStop = 1U }
	asrc prefilter and resampler sample buffer stop mode More...

enum	asrc_prefilter_stage1_result_t { kASRC_PrefilterStage1ResultInt = 0U, kASRC_PrefilterStage1ResultFloat = 1U }
	ASRC prefilter stage1 result format. More...

enum	asrc_resampler_taps_t { kASRC_ResamplerTaps_32 = 32U, kASRC_ResamplerTaps_64 = 64U, kASRC_ResamplerTaps_128 = 128U }
	ASRC resampler taps. More...

enum	_asrc_sample_rate { kASRC_SampleRate_8000 = 8000, kASRC_SampleRate_11025 = 11025, kASRC_SampleRate_12000 = 12000, kASRC_SampleRate_16000 = 16000, kASRC_SampleRate_22050 = 22050, kASRC_SampleRate_24000 = 24000, kASRC_SampleRate_32000 = 32000, kASRC_SampleRate_44100 = 44100, kASRC_SampleRate_48000 = 48000, kASRC_SampleRate_64000 = 64000, kASRC_SampleRate_88200 = 88200, kASRC_SampleRate_96000 = 96000, kASRC_SampleRate_128000 = 128000, kASRC_SampleRate_176400 = 176400, kASRC_SampleRate_192000 = 192000, kASRC_SampleRate_256000 = 256000, kASRC_SampleRate_352800 = 352800, kASRC_SampleRate_384000 = 384000, kASRC_SampleRate_768000 = 768000 }
	ASRC support sample rate. More...

Driver version
#define	FSL_ASRC_DRIVER_VERSION (MAKE_VERSION(2, 0, 1))
	Version 2.0.1.

Initialization and deinitialization
uint32_t	ASRC_GetInstance (ASRC_Type *base)
	Get instance number of the ASRC peripheral. More...

void	ASRC_Init (ASRC_Type *base)
	brief Initializes the asrc peripheral. More...

void	ASRC_Deinit (ASRC_Type *base)
	De-initializes the ASRC peripheral. More...

void	ASRC_GetContextDefaultConfig (asrc_context_config_t *config, uint32_t channels, uint32_t inSampleRate, uint32_t outSampleRate)
	ASRC get context default configuration. More...

status_t	ASRC_SetContextConfig (ASRC_Type base, asrc_context_t context, asrc_context_config_t config)
	ASRC configure context. More...

status_t	ASRC_SetContextOutputConfig (ASRC_Type base, asrc_context_t context, asrc_context_output_config_t config)
	ASRC configure context output. More...

status_t	ASRC_SetContextInputConfig (ASRC_Type base, asrc_context_t context, asrc_context_input_config_t config)
	ASRC configure context input. More...

static void	ASRC_EnableContextRun (ASRC_Type *base, asrc_context_t context, bool enable)
	ASRC context enable run. More...

static void	ASRC_EnableContextRunStop (ASRC_Type *base, asrc_context_t context, bool enable)
	ASRC context enable run stop. More...

static void	ASRC_EnableContextInDMA (ASRC_Type *base, asrc_context_t context, bool enable)
	ASRC context input DMA request enable. More...

static void	ASRC_EnableContextOutDMA (ASRC_Type *base, asrc_context_t context, bool enable)
	ASRC context output DMA request enable. More...

static void	ASRC_EnablePreFilterBypass (ASRC_Type *base, asrc_context_t context, bool bypass)
	ASRC prefilter bypass mode This function enable the ASRC prefilter bypass mode. More...

static void	ASRC_EnableResamplerBypass (ASRC_Type *base, asrc_context_t context, bool bypass)
	ASRC resampler bypass mode This function enable the ASRC resampler bypass mode. More...

static void	ASRC_SetContextChannelNumber (ASRC_Type *base, asrc_context_t context, uint32_t channels)
	ASRC set context channel number. More...

uint32_t	ASRC_GetContextOutSampleSize (uint32_t inSampleRate, uint32_t inSamplesSize, uint32_t inWidth, uint32_t outSampleRate, uint32_t outWidth)
	ASRC get output sample count. More...

Interrupts
static void	ASRC_EnableInterrupt (ASRC_Type *base, uint32_t mask)
	ASRC interrupt enable This function enable the ASRC interrupt with the provided mask. More...

static void	ASRC_DisableInterrupt (ASRC_Type *base, uint32_t mask)
	ASRC interrupt disable This function disable the ASRC interrupt with the provided mask. More...

Status
static uint32_t	ASRC_GetInterruptStatus (ASRC_Type *base)
	Gets the ASRC interrupt status flag state. More...

static void	ASRC_ClearInterruptStatus (ASRC_Type *base, uint32_t status)
	clear the ASRC interrupt status flag state. More...

static uint32_t	ASRC_GetFifoStatus (ASRC_Type *base, asrc_context_t context)
	Gets the ASRC fifo status flag. More...

fifo Operations
static void	ASRC_WriteContextFifo (ASRC_Type *base, asrc_context_t context, uint32_t data)
	write the ASRC context fifo. More...

static uint32_t	ASRC_ReadContextFifo (ASRC_Type *base, asrc_context_t context)
	read the ASRC context fifo. More...

static uint32_t	ASRC_GetWriteContextFifoAddr (ASRC_Type *base, asrc_context_t context)
	Get ASRC write fifo address. More...

static uint32_t	ASRC_GetReadContextFifoAddr (ASRC_Type *base, asrc_context_t context)
	Get the ASRC read context fifo address. More...

uint32_t	ASRC_ReadFIFORemainedSample (ASRC_Type base, asrc_context_t context, uint32_t outAddr, uint32_t outWidth, uint32_t sampleCount)
	Get the ASRC read fifo remained samples. More...

Transactional
status_t	ASRC_TransferBlocking (ASRC_Type base, asrc_context_t context, asrc_transfer_t xfer)
	ASRC blocking convert audio sample rate. More...

Data Structure Documentation

struct asrc_data_format_t

Data Fields
uint8_t	dataPosition
	context input data sample position

asrc_data_endianness_t	dataEndianness
	context input data endianness

asrc_data_width_t	dataWidth
	context input data width

asrc_data_type_t	dataType
	context input data type

asrc_data_sign_t	dataSign
	context input data signed or unsigned

struct asrc_access_ctrl_t

The interleave patter is controlled using 3 register fields: GROUP_LENGTH, ACCESS_LENGTH, ITERATIONIS. This is intended to support hardware configurations which distribute a single context across samples from multiple audio sources. Take a example as below: accessGroupLen = 6, the sample group length is 6 samples accessIterations = 2, the 2 sequential ACCESS_LENGTH read from single source accessLen = 2, the 2 samples fetch from one source.

Data Fields
uint8_t	accessIterations
	number of sequential fetches per source

uint8_t	accessGroupLen
	number of channels in a context

uint8_t	accessLen
	number of channels per source1

struct asrc_context_input_config_t

Data Fields
uint32_t	sampleRate
	input audio data sample rate

uint8_t	watermark
	input water mark per samples

asrc_access_ctrl_t	accessCtrl
	input access control

asrc_data_format_t	dataFormat
	input data format

struct asrc_context_output_config_t

Data Fields
uint32_t	sampleRate
	output audio data sample rate

uint8_t	watermark
	output water mark per samples

asrc_access_ctrl_t	accessCtrl
	output access control

asrc_data_format_t	dataFormat
	output data format

bool	enableDither
	output path contains a TPDF dither function. More...

bool	enableIEC60958
	output IEC60958 bit field insertion enable

Field Documentation

bool asrc_context_output_config_t::enableDither

The dither function support all fixed output modes(16, 20, 24, 32bits) dither is not supported in 32bit floating point output mode

struct asrc_context_prefilter_config_t

Data Fields
asrc_sampleBuffer_init_mode_t	initMode
	prefilter initial mode

asrc_sampleBuffer_stop_mode_t	stopMode
	prefilter stop mode

asrc_prefilter_stage1_result_t	stage1Result
	stage1 data store format

uint32_t	filterSt1Taps
	prefilter stage1 taps

uint32_t	filterSt2Taps
	prefilter stage2 taps

uint32_t	filterSt1Exp
	prefilter stage1 expansion factor

const uint32_t *	filterCoeffAddress
	prefilter coeff address

struct asrc_context_resampler_config_t

Data Fields
asrc_sampleBuffer_init_mode_t	initMode
	initial mode

asrc_sampleBuffer_stop_mode_t	stopMode
	resampler stop mode

asrc_resampler_taps_t	tap
	resampleer taps

uint32_t	filterPhases
	interpolation phases

uint64_t	filterCenterTap
	interpolation center tap

const uint32_t *	filterCoeffAddress
	interpolation coeff address

struct asrc_context_config_t

Data Fields
uint8_t	contextChannelNums
	context channel numbers

asrc_context_input_config_t	contextInput
	context input configuration

asrc_context_output_config_t	contextOutput
	context output configuration

asrc_context_prefilter_config_t	contextPrefilter
	context pre filter configuration

asrc_context_resampler_config_t	contextResampler
	context resampler configuration

struct asrc_transfer_t

Data Fields
uint32_t *	inDataAddr
	address of audio data to be converted

uint32_t	inDataSize
	size of the audio data

uint32_t *	outDataAddr
	address of audio data that is been converted

uint32_t	outDataSize
	size of the audio data

Enumeration Type Documentation

enum _asrc_status

Enumerator
kStatus_ASRCIdle	ASRC is idle.
kStatus_ASRCBusy	ASRC is busy.
kStatus_ASRCInvalidArgument	ASRC invalid argument.
kStatus_ASRCConfigureFailed	ASRC configure failed.
kStatus_ASRCConvertError	ASRC convert error failed.
kStatus_ASRCNotSupport	ASRC not support.
kStatus_ASRCQueueFull	ASRC queue full.
kStatus_ASRCQueueIdle	ASRC quue idle.
kStatus_ASRCLoadFirmwareFailed	ASRC load firmware failed.
kStatus_ASRCResamplerConfigureFailed	ASRC resampler configured failed.
kStatus_ASRCPrefilterConfigureFailed	ASRC prefilter configured failed.

enum asrc_context_t

Enumerator
kASRC_Context0	Context 0 value.
kASRC_Context1	Context 1 value.
kASRC_Context2	Context 2 value.
kASRC_Context3	Context 3 value.

enum _asrc_interrupt_mask

Enumerator
kASRC_Context0InputFifoOverflow	context 0 input fifo overflow
kASRC_Context1InputFifoOverflow	context 1 input fifo overflow
kASRC_Context2InputFifoOverflow	context 2 input fifo overflow
kASRC_Context3InputFifoOverflow	context 3 input fifo overflow
kASRC_Context0OutFifoReadEmpty	context 0 out fifo read empty
kASRC_Context1OutFifoReadEmpty	context 1 out fifo read empty
kASRC_Context2OutFifoReadEmpty	context 2 out fifo read empty
kASRC_Context3OutFifoReadEmpty	context 3 out fifo read empty
kASRC_Context0RunStopDone	context 0 run stop done interrupt
kASRC_Context1RunStopDone	context 1 run stop done interrupt
kASRC_Context2RunStopDone	context 2 run stop done interrupt
kASRC_Context3RunStopDone	context 3 run stop done interrupt
kASRC_ContextAllInterruptStatus	all the context interrupt status

enum _asrc_fifo_status

Enumerator
kASRC_FifoStatusInputFifoWatermarkFlag	input water mark flag raised
kASRC_FifoStatusOutputFifoWatermarkFlag	output water mark flag raised

enum asrc_data_endianness_t

Enumerator
kASRC_DataEndianLittle	context data little endian
kASRC_DataEndianBig	context data big endian

enum asrc_data_width_t

Enumerator
kASRC_DataWidth32Bit	data width 32bit
kASRC_DataWidth24Bit	data width 24bit
kASRC_DataWidth20Bit	data width 20bit
kASRC_DataWidth16Bit	data width 16bit

enum asrc_data_type_t

Enumerator
kASRC_DataTypeInteger	data type int
kASRC_DataTypeFloat	data type float, single precision floating point format

enum asrc_data_sign_t

Enumerator
kASRC_DataSigned	input data is signed
kASRC_DataUnsigned	input data is unsinged

enum asrc_sampleBuffer_init_mode_t

Enumerator
kASRC_SampleBufferNoPreFillOnInit	do not pre-fill
kASRC_SampleBufferFillFirstSampleOnInit	replicate the first sample to fill the right half of the sample buffer
kASRC_SampleBufferFillZeroOnInit	zero fill the right half og the sample buffer

enum asrc_sampleBuffer_stop_mode_t

Enumerator
kASRC_SampleBufferFillLastSampleOnStop	replicate the last sample to fill the left half of the sample buffer
kASRC_SampleBufferFillZeroOnStop	zero fill the left half of the sample buffer

enum asrc_prefilter_stage1_result_t

Enumerator
kASRC_PrefilterStage1ResultInt	prefilter stage1 results are stored in 32 bit int format
kASRC_PrefilterStage1ResultFloat	prefilter stage1 results are stored in 32 bit float format

enum asrc_resampler_taps_t

Enumerator
kASRC_ResamplerTaps_32	resampler taps 32
kASRC_ResamplerTaps_64	resampler taps 64
kASRC_ResamplerTaps_128	resampler taps 128

enum _asrc_sample_rate

Enumerator
kASRC_SampleRate_8000	8K sample rate
kASRC_SampleRate_11025	11025 sample rate
kASRC_SampleRate_12000	12K sample rate
kASRC_SampleRate_16000	16K sample rate
kASRC_SampleRate_22050	22.05K sample rate
kASRC_SampleRate_24000	24K sample rate
kASRC_SampleRate_32000	32K sample rate
kASRC_SampleRate_44100	44.1K sample rate
kASRC_SampleRate_48000	48K sample rate
kASRC_SampleRate_64000	64K sample rate
kASRC_SampleRate_88200	88.2K sample rate
kASRC_SampleRate_96000	96K sample rate
kASRC_SampleRate_128000	128K sample rate
kASRC_SampleRate_176400	176K sample rate
kASRC_SampleRate_192000	256K sample rate
kASRC_SampleRate_256000	256K sample rate
kASRC_SampleRate_352800	352.8K sample rate
kASRC_SampleRate_384000	384K sample rate
kASRC_SampleRate_768000	768K sample rate

Function Documentation

uint32_t ASRC_GetInstance ( ASRC_Type * base )

Parameters

base	ASRC base pointer.

void ASRC_Init ( ASRC_Type * base )

This API gates the asrc clock. The asrc module can't operate unless ASRC_Init is called to enable the clock.

param base asrc base pointer.

void ASRC_Deinit ( ASRC_Type * base )

This API gates the ASRC clock and disable ASRC module. The ASRC module can't operate unless ASRC_Init

Parameters

base	ASRC base pointer.

void ASRC_GetContextDefaultConfig	(	asrc_context_config_t *	config,
		uint32_t	channels,
		uint32_t	inSampleRate,
		uint32_t	outSampleRate
	)

Parameters

config	ASRC context configuration pointer.
channels	input audio data channel numbers.
inSampleRate	input sample rate.
outSampleRate	output sample rate.

status_t ASRC_SetContextConfig	(	ASRC_Type *	base,
		asrc_context_t	context,
		asrc_context_config_t *	config
	)

Parameters

base	ASRC base pointer.
context	index of asrc context, reference asrc_context_t.
config	ASRC context configuration pointer.

Return values

kStatus_InvalidArgument invalid parameters. kStatus_ASRCConfigureFailed context configure failed. kStatus_Success context configure success.

status_t ASRC_SetContextOutputConfig	(	ASRC_Type *	base,
		asrc_context_t	context,
		asrc_context_output_config_t *	config
	)

Parameters

base	ASRC base pointer.
context	index of asrc context, reference asrc_context_t.
config	ASRC context output configuration pointer.

status_t ASRC_SetContextInputConfig	(	ASRC_Type *	base,
		asrc_context_t	context,
		asrc_context_input_config_t *	config
	)

Parameters

base	ASRC base pointer.
context	index of asrc context, reference asrc_context_t.
config	ASRC context input configuration pointer.

static void ASRC_EnableContextRun	(	ASRC_Type *	base,
		asrc_context_t	context,
		bool	enable
	)

inlinestatic

All control fileds associated with a context must be stable prior to setting context run enable.

Parameters

base	ASRC base pointer.
context	ASRC context index.
enable	true is enable, inform the datapath begin processing sample data for the context. false is disable, data processing will halt immediately.

static void ASRC_EnableContextRunStop	(	ASRC_Type *	base,
		asrc_context_t	context,
		bool	enable
	)

inlinestatic

This function used to flush the ASRC pipeline and completely end processing for a context.

Parameters

base	ASRC base pointer.
context	ASRC context index.
enable	true is enable, false is disable.

static void ASRC_EnableContextInDMA	(	ASRC_Type *	base,
		asrc_context_t	context,
		bool	enable
	)

inlinestatic

Parameters

base	ASRC base pointer.
context	ASRC context index.
enable	true is enable, false is disable.

static void ASRC_EnableContextOutDMA	(	ASRC_Type *	base,
		asrc_context_t	context,
		bool	enable
	)

inlinestatic

Parameters

base	ASRC base pointer.
context	ASRC context index.
enable	true is enable, false is disable.

static void ASRC_EnablePreFilterBypass	(	ASRC_Type *	base,
		asrc_context_t	context,
		bool	bypass
	)

inlinestatic

Parameters

base	ASRC peripheral base address.
context	context processor number.
bypass	true is bypass, false is normal mode.

static void ASRC_EnableResamplerBypass	(	ASRC_Type *	base,
		asrc_context_t	context,
		bool	bypass
	)

inlinestatic

Parameters

base	ASRC peripheral base address.
context	context processor number.
bypass	true is bypass, false is normal mode.

static void ASRC_SetContextChannelNumber	(	ASRC_Type *	base,
		asrc_context_t	context,
		uint32_t	channels
	)

inlinestatic

Note: The maximum channel number in one context can not exceed 32.

Parameters

base	ASRC peripheral base address.
context	context number.
channels	channel number, should <= 32.

uint32_t ASRC_GetContextOutSampleSize	(	uint32_t	inSampleRate,
		uint32_t	inSamplesSize,
		uint32_t	inWidth,
		uint32_t	outSampleRate,
		uint32_t	outWidth
	)

Parameters

inSampleRate	output sample rate.
inSamplesSize	input sample rate.
inWidth	input samples buffer size, the size of buffer should be converted to align with 4 byte .
outSampleRate	input sample width.
outWidth	Output width.

Return values

output samples size.

static void ASRC_EnableInterrupt	(	ASRC_Type *	base,
		uint32_t	mask
	)

inlinestatic

Parameters

base	ASRC peripheral base address.
mask	The interrupts to enable. Logical OR of _asrc_interrupt_mask.

static void ASRC_DisableInterrupt	(	ASRC_Type *	base,
		uint32_t	mask
	)

inlinestatic

Parameters

base	ASRC peripheral base address.
mask	The interrupts to disable. Logical OR of _asrc_interrupt_mask.

static uint32_t ASRC_GetInterruptStatus ( ASRC_Type * base )

inlinestatic

Parameters

base	ASRC base pointer

Returns: ASRC Tx status flag value. Use the Status Mask to get the status value needed.

static void ASRC_ClearInterruptStatus	(	ASRC_Type *	base,
		uint32_t	status
	)

inlinestatic

Parameters

base	ASRC base pointer
status	status flag to be cleared.

static uint32_t ASRC_GetFifoStatus	(	ASRC_Type *	base,
		asrc_context_t	context
	)

inlinestatic

Parameters

base	ASRC base pointer

static void ASRC_WriteContextFifo	(	ASRC_Type *	base,
		asrc_context_t	context,
		uint32_t	data
	)

inlinestatic

Parameters

base	ASRC base pointer.
context	context id.
data	data to write.

static uint32_t ASRC_ReadContextFifo	(	ASRC_Type *	base,
		asrc_context_t	context
	)

inlinestatic

Parameters

base	ASRC base pointer.
context	context id.

Return values

read data.

static uint32_t ASRC_GetWriteContextFifoAddr	(	ASRC_Type *	base,
		asrc_context_t	context
	)

inlinestatic

Parameters

base	ASRC base pointer.
context	context id.

Return values

write fifo address.

static uint32_t ASRC_GetReadContextFifoAddr	(	ASRC_Type *	base,
		asrc_context_t	context
	)

inlinestatic

Parameters

base	ASRC base pointer.
context	context id.

Return values

read	fifo address.

uint32_t ASRC_ReadFIFORemainedSample	(	ASRC_Type *	base,
		asrc_context_t	context,
		uint32_t *	outAddr,
		uint32_t	outWidth,
		uint32_t	sampleCount
	)

Since the DMA request will be triggered only when the sample group in read fifo is bigger then the watermark, so when the data size cannot be divisible by the (watermark + 1), then part of sample will left in read fifo, application should call this api to get the left samples.

Parameters

base	ASRC base pointer.
context	context id.
outAddr	address to receive remained sample in read fifo.
outWidth	output data width.
sampleCount	specify the read sample count.

Return values

sample counts actual read from output fifo.

status_t ASRC_TransferBlocking	(	ASRC_Type *	base,
		asrc_context_t	context,
		asrc_transfer_t *	xfer
	)

This function depends on the configuration of input and output, so it should be called after the ASRC_SetContextConfig. The data format it supports: 1.16bit 16bit per sample in input buffer, input buffer size should be calculate as: samples 2U output buffer size can be calculated by call function ASRC_GetContextOutSampleSize, the parameter outWidth should be 2 2.20bit 24bit per sample in input buffer, input buffer size should be calculate as: samples 3U output buffer size can be calculated by call function ASRC_GetContextOutSampleSize, the outWidth should be 3. 3.24bit 24bit per sample in input buffer, input buffer size should be calculate as: samples * 3U output buffer size can be calculated by call function ASRC_GetContextOutSampleSize, the outWidth should be 3. 4.32bit 32bit per sample in input buffer, input buffer size should be calculate as: samples * 4U output buffer size can be calculated by call function ASRC_GetContextOutSampleSize, the outWidth should be 4.

Parameters

base	ASRC base pointer.
context	context id.
xfer	.xfer configuration.

Return values

kStatus_Success.

Overview

Data Structures

Macros

Enumerations

Driver version

Initialization and deinitialization

Interrupts

Status

fifo Operations

Transactional

Data Structure Documentation

Data Fields

Data Fields

Data Fields

Data Fields

Field Documentation

Data Fields

Data Fields

Data Fields

Data Fields

Enumeration Type Documentation

Function Documentation