Overview

The wm8904 driver provides a codec control interface.

Data Structures
struct	wm8904_fll_config_t
	wm8904 fll configuration More...

struct	wm8904_audio_format_t
	Audio format configuration. More...

struct	wm8904_config_t
	Configuration structure of WM8904. More...

struct	wm8904_handle_t
	wm8904 codec handler More...

Macros
#define	WM8904_I2C_HANDLER_SIZE (CODEC_I2C_MASTER_HANDLER_SIZE)
	wm8904 handle size

#define	WM8904_DEBUG_REGISTER 0
	wm8904 debug macro

#define	WM8904_RESET (0x00)
	WM8904 register map.

#define	WM8904_I2C_ADDRESS (0x1A)
	WM8904 I2C address. More...

#define	WM8904_I2C_BITRATE (400000U)
	WM8904 I2C bit rate. More...

#define	WM8904_MAP_HEADPHONE_LINEOUT_MAX_VOLUME 0x3FU
	WM8904 maximum volume.

Enumerations
enum	{ kStatus_WM8904_Success = 0x0, kStatus_WM8904_Fail = 0x1 }
	WM8904 status return codes. More...

enum	{ kWM8904_LRCPolarityNormal = 0U, kWM8904_LRCPolarityInverted = 1U << 4U }
	WM8904 lrc polarity. More...

enum	wm8904_module_t { kWM8904_ModuleADC = 0, kWM8904_ModuleDAC = 1, kWM8904_ModulePGA = 2, kWM8904_ModuleHeadphone = 3, kWM8904_ModuleLineout = 4 }
	wm8904 module value More...

enum
	wm8904 play channel More...

enum	wm8904_timeslot_t { kWM8904_TimeSlot0 = 0U, kWM8904_TimeSlot1 = 1U }
	WM8904 time slot. More...

enum	wm8904_protocol_t { kWM8904_ProtocolI2S = 0x2, kWM8904_ProtocolLeftJustified = 0x1, kWM8904_ProtocolRightJustified = 0x0, kWM8904_ProtocolPCMA = 0x3, kWM8904_ProtocolPCMB = 0x3 \| (1 << 4) }
	The audio data transfer protocol. More...

enum	wm8904_fs_ratio_t { kWM8904_FsRatio64X = 0x0, kWM8904_FsRatio128X = 0x1, kWM8904_FsRatio192X = 0x2, kWM8904_FsRatio256X = 0x3, kWM8904_FsRatio384X = 0x4, kWM8904_FsRatio512X = 0x5, kWM8904_FsRatio768X = 0x6, kWM8904_FsRatio1024X = 0x7, kWM8904_FsRatio1408X = 0x8, kWM8904_FsRatio1536X = 0x9 }
	The SYSCLK / fs ratio. More...

enum	wm8904_sample_rate_t { kWM8904_SampleRate8kHz = 0x0, kWM8904_SampleRate12kHz = 0x1, kWM8904_SampleRate16kHz = 0x2, kWM8904_SampleRate24kHz = 0x3, kWM8904_SampleRate32kHz = 0x4, kWM8904_SampleRate48kHz = 0x5, kWM8904_SampleRate11025Hz = 0x6, kWM8904_SampleRate22050Hz = 0x7, kWM8904_SampleRate44100Hz = 0x8 }
	Sample rate. More...

enum	wm8904_bit_width_t { kWM8904_BitWidth16 = 0x0, kWM8904_BitWidth20 = 0x1, kWM8904_BitWidth24 = 0x2, kWM8904_BitWidth32 = 0x3 }
	Bit width. More...

enum	{ kWM8904_RecordSourceDifferentialLine = 1U, kWM8904_RecordSourceLineInput = 2U, kWM8904_RecordSourceDifferentialMic = 4U, kWM8904_RecordSourceDigitalMic = 8U }
	wm8904 record source More...

enum	{ kWM8904_RecordChannelLeft1 = 1U, kWM8904_RecordChannelLeft2 = 2U, kWM8904_RecordChannelLeft3 = 4U, kWM8904_RecordChannelRight1 = 1U, kWM8904_RecordChannelRight2 = 2U, kWM8904_RecordChannelRight3 = 4U, kWM8904_RecordChannelDifferentialPositive1 = 1U, kWM8904_RecordChannelDifferentialPositive2 = 2U, kWM8904_RecordChannelDifferentialPositive3 = 4U, kWM8904_RecordChannelDifferentialNegative1 = 8U, kWM8904_RecordChannelDifferentialNegative2 = 16U, kWM8904_RecordChannelDifferentialNegative3 = 32U }
	wm8904 record channel More...

enum	{ kWM8904_PlaySourcePGA = 1U, kWM8904_PlaySourceDAC = 4U }
	wm8904 play source More...

enum	wm8904_sys_clk_source_t { kWM8904_SysClkSourceMCLK = 0U, kWM8904_SysClkSourceFLL = 1U << 14 }
	wm8904 system clock source More...

enum	wm8904_fll_clk_source_t { kWM8904_FLLClkSourceMCLK = 0U }
	wm8904 fll clock source More...

Functions
status_t	WM8904_WriteRegister (wm8904_handle_t *handle, uint8_t reg, uint16_t value)
	WM8904 write register. More...

status_t	WM8904_ReadRegister (wm8904_handle_t handle, uint8_t reg, uint16_t value)
	WM8904 write register. More...

status_t	WM8904_ModifyRegister (wm8904_handle_t *handle, uint8_t reg, uint16_t mask, uint16_t value)
	WM8904 modify register. More...

status_t	WM8904_Init (wm8904_handle_t handle, wm8904_config_t wm8904Config)
	Initializes WM8904. More...

status_t	WM8904_Deinit (wm8904_handle_t *handle)
	Deinitializes the WM8904 codec. More...

void	WM8904_GetDefaultConfig (wm8904_config_t *config)
	Fills the configuration structure with default values. More...

status_t	WM8904_SetMasterSlave (wm8904_handle_t *handle, bool master)
	Sets WM8904 as master or slave. More...

status_t	WM8904_SetMasterClock (wm8904_handle_t *handle, uint32_t sysclk, uint32_t sampleRate, uint32_t bitWidth)
	Sets WM8904 master clock configuration. More...

status_t	WM8904_SetFLLConfig (wm8904_handle_t handle, wm8904_fll_config_t config)
	WM8904 set PLL configuration This function will enable the GPIO1 FLL clock output function, so user can see the generated fll output clock frequency from WM8904 GPIO1. More...

status_t	WM8904_SetProtocol (wm8904_handle_t *handle, wm8904_protocol_t protocol)
	Sets the audio data transfer protocol. More...

status_t	WM8904_SetAudioFormat (wm8904_handle_t *handle, uint32_t sysclk, uint32_t sampleRate, uint32_t bitWidth)
	Sets the audio data format. More...

status_t	WM8904_CheckAudioFormat (wm8904_handle_t handle, wm8904_audio_format_t format, uint32_t mclkFreq)
	check and update the audio data format. More...

status_t	WM8904_SetVolume (wm8904_handle_t *handle, uint16_t volumeLeft, uint16_t volumeRight)
	Sets the module output volume. More...

status_t	WM8904_SetMute (wm8904_handle_t *handle, bool muteLeft, bool muteRight)
	Sets the headphone output mute. More...

status_t	WM8904_SelectLRCPolarity (wm8904_handle_t *handle, uint32_t polarity)
	Select LRC polarity. More...

status_t	WM8904_EnableDACTDMMode (wm8904_handle_t *handle, wm8904_timeslot_t timeSlot)
	Enable WM8904 DAC time slot. More...

status_t	WM8904_EnableADCTDMMode (wm8904_handle_t *handle, wm8904_timeslot_t timeSlot)
	Enable WM8904 ADC time slot. More...

status_t	WM8904_SetModulePower (wm8904_handle_t *handle, wm8904_module_t module, bool isEnabled)
	SET the module output power. More...

status_t	WM8904_SetDACVolume (wm8904_handle_t *handle, uint8_t volume)
	SET the DAC module volume. More...

status_t	WM8904_SetChannelVolume (wm8904_handle_t *handle, uint32_t channel, uint32_t volume)
	Sets the channel output volume. More...

status_t	WM8904_SetRecord (wm8904_handle_t *handle, uint32_t recordSource)
	SET the WM8904 record source. More...

status_t	WM8904_SetRecordChannel (wm8904_handle_t *handle, uint32_t leftRecordChannel, uint32_t rightRecordChannel)
	SET the WM8904 record source. More...

status_t	WM8904_SetPlay (wm8904_handle_t *handle, uint32_t playSource)
	SET the WM8904 play source. More...

status_t	WM8904_SetChannelMute (wm8904_handle_t *handle, uint32_t channel, bool isMute)
	Sets the channel mute. More...

Driver version
#define	FSL_WM8904_DRIVER_VERSION (MAKE_VERSION(2, 5, 1))
	WM8904 driver version 2.5.1. More...

Data Structure Documentation

struct wm8904_fll_config_t

Data Fields
wm8904_fll_clk_source_t	source
	fll reference clock source

uint32_t	refClock_HZ
	fll reference clock frequency

uint32_t	outputClock_HZ
	fll output clock frequency

struct wm8904_audio_format_t

Data Fields
wm8904_fs_ratio_t	fsRatio
	SYSCLK / fs ratio.

wm8904_sample_rate_t	sampleRate
	Sample rate.

wm8904_bit_width_t	bitWidth
	Bit width.

struct wm8904_config_t

Data Fields
bool	master
	Master or slave.

wm8904_sys_clk_source_t	sysClkSource
	system clock source

wm8904_fll_config_t *	fll
	fll configuration

wm8904_protocol_t	protocol
	Audio transfer protocol.

wm8904_audio_format_t	format
	Audio format.

uint32_t	mclk_HZ
	MCLK frequency value.

uint16_t	recordSource
	record source

uint16_t	recordChannelLeft
	record channel

uint16_t	recordChannelRight
	record channel

uint16_t	playSource
	play source

uint8_t	slaveAddress
	code device slave address

codec_i2c_config_t	i2cConfig
	i2c bus configuration

struct wm8904_handle_t

Data Fields
wm8904_config_t *	config
	wm8904 config pointer

uint8_t	i2cHandle [WM8904_I2C_HANDLER_SIZE]
	i2c handle

Macro Definition Documentation

#define FSL_WM8904_DRIVER_VERSION (MAKE_VERSION(2, 5, 1))

#define WM8904_I2C_ADDRESS (0x1A)

#define WM8904_I2C_BITRATE (400000U)

Enumeration Type Documentation

anonymous enum

Enumerator
kStatus_WM8904_Success	Success.
kStatus_WM8904_Fail	Failure.

anonymous enum

Enumerator
kWM8904_LRCPolarityNormal	LRC polarity normal.
kWM8904_LRCPolarityInverted	LRC polarity inverted.

enum wm8904_module_t

Enumerator
kWM8904_ModuleADC	moduel ADC
kWM8904_ModuleDAC	module DAC
kWM8904_ModulePGA	module PGA
kWM8904_ModuleHeadphone	module headphone
kWM8904_ModuleLineout	module line out

anonymous enum

enum wm8904_timeslot_t

Enumerator
kWM8904_TimeSlot0	time slot0
kWM8904_TimeSlot1	time slot1

enum wm8904_protocol_t

Enumerator
kWM8904_ProtocolI2S	I2S type.
kWM8904_ProtocolLeftJustified	Left justified mode.
kWM8904_ProtocolRightJustified	Right justified mode.
kWM8904_ProtocolPCMA	PCM A mode.
kWM8904_ProtocolPCMB	PCM B mode.

enum wm8904_fs_ratio_t

Enumerator
kWM8904_FsRatio64X	SYSCLK is 64 * sample rate * frame width.
kWM8904_FsRatio128X	SYSCLK is 128 * sample rate * frame width.
kWM8904_FsRatio192X	SYSCLK is 192 * sample rate * frame width.
kWM8904_FsRatio256X	SYSCLK is 256 * sample rate * frame width.
kWM8904_FsRatio384X	SYSCLK is 384 * sample rate * frame width.
kWM8904_FsRatio512X	SYSCLK is 512 * sample rate * frame width.
kWM8904_FsRatio768X	SYSCLK is 768 * sample rate * frame width.
kWM8904_FsRatio1024X	SYSCLK is 1024 * sample rate * frame width.
kWM8904_FsRatio1408X	SYSCLK is 1408 * sample rate * frame width.
kWM8904_FsRatio1536X	SYSCLK is 1536 * sample rate * frame width.

enum wm8904_sample_rate_t

Enumerator
kWM8904_SampleRate8kHz	8 kHz
kWM8904_SampleRate12kHz	12kHz
kWM8904_SampleRate16kHz	16kHz
kWM8904_SampleRate24kHz	24kHz
kWM8904_SampleRate32kHz	32kHz
kWM8904_SampleRate48kHz	48kHz
kWM8904_SampleRate11025Hz	11.025kHz
kWM8904_SampleRate22050Hz	22.05kHz
kWM8904_SampleRate44100Hz	44.1kHz

enum wm8904_bit_width_t

Enumerator
kWM8904_BitWidth16	16 bits
kWM8904_BitWidth20	20 bits
kWM8904_BitWidth24	24 bits
kWM8904_BitWidth32	32 bits

anonymous enum

Enumerator
kWM8904_RecordSourceDifferentialLine	record source from differential line
kWM8904_RecordSourceLineInput	record source from line input
kWM8904_RecordSourceDifferentialMic	record source from differential mic
kWM8904_RecordSourceDigitalMic	record source from digital microphone

anonymous enum

Enumerator
kWM8904_RecordChannelLeft1	left record channel 1
kWM8904_RecordChannelLeft2	left record channel 2
kWM8904_RecordChannelLeft3	left record channel 3
kWM8904_RecordChannelRight1	right record channel 1
kWM8904_RecordChannelRight2	right record channel 2
kWM8904_RecordChannelRight3	right record channel 3
kWM8904_RecordChannelDifferentialPositive1	differential positive record channel 1
kWM8904_RecordChannelDifferentialPositive2	differential positive record channel 2
kWM8904_RecordChannelDifferentialPositive3	differential positive record channel 3
kWM8904_RecordChannelDifferentialNegative1	differential negative record channel 1
kWM8904_RecordChannelDifferentialNegative2	differential negative record channel 2
kWM8904_RecordChannelDifferentialNegative3	differential negative record channel 3

anonymous enum

Enumerator
kWM8904_PlaySourcePGA	play source PGA, bypass ADC
kWM8904_PlaySourceDAC	play source Input3

enum wm8904_sys_clk_source_t

Enumerator
kWM8904_SysClkSourceMCLK	wm8904 system clock soure from MCLK
kWM8904_SysClkSourceFLL	wm8904 system clock soure from FLL

enum wm8904_fll_clk_source_t

Enumerator
kWM8904_FLLClkSourceMCLK	wm8904 FLL clock source from MCLK

Function Documentation

status_t WM8904_WriteRegister	(	wm8904_handle_t *	handle,
		uint8_t	reg,
		uint16_t	value
	)

Parameters

handle	WM8904 handle structure.
reg	register address.
value	value to write.

Returns: kStatus_Success, else failed.

status_t WM8904_ReadRegister	(	wm8904_handle_t *	handle,
		uint8_t	reg,
		uint16_t *	value
	)

Parameters

handle	WM8904 handle structure.
reg	register address.
value	value to read.

Returns: kStatus_Success, else failed.

status_t WM8904_ModifyRegister	(	wm8904_handle_t *	handle,
		uint8_t	reg,
		uint16_t	mask,
		uint16_t	value
	)

Parameters

handle	WM8904 handle structure.
reg	register address.
mask	register bits mask.
value	value to write.

Returns: kStatus_Success, else failed.

status_t WM8904_Init	(	wm8904_handle_t *	handle,
		wm8904_config_t *	wm8904Config
	)

Parameters

handle	WM8904 handle structure.
wm8904Config	WM8904 configuration structure.

status_t WM8904_Deinit ( wm8904_handle_t * handle )

This function resets WM8904.

Parameters

handle WM8904 handle structure.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

void WM8904_GetDefaultConfig ( wm8904_config_t * config )

The default values are:

master = false; protocol = kWM8904_ProtocolI2S; format.fsRatio = kWM8904_FsRatio64X; format.sampleRate = kWM8904_SampleRate48kHz; format.bitWidth = kWM8904_BitWidth16;

Parameters

config default configurations of wm8904.

status_t WM8904_SetMasterSlave	(	wm8904_handle_t *	handle,
		bool	master
	)

Deprecated:: DO NOT USE THIS API ANYMORE. IT HAS BEEN SUPERCEDED BY WM8904_SetMasterClock

Parameters

handle	WM8904 handle structure.
master	true for master, false for slave.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetMasterClock	(	wm8904_handle_t *	handle,
		uint32_t	sysclk,
		uint32_t	sampleRate,
		uint32_t	bitWidth
	)

User should pay attention to the sysclk parameter ,When using external MCLK as system clock source, the value should be frequency of MCLK, when using FLL as system clock source, the value should be frequency of the output of FLL.

Parameters

handle	WM8904 handle structure.
sysclk	system clock source frequency.
sampleRate	sample rate
bitWidth	bit width

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetFLLConfig	(	wm8904_handle_t *	handle,
		wm8904_fll_config_t *	config
	)

Parameters

handle	wm8904 handler pointer.
config	FLL configuration pointer.

status_t WM8904_SetProtocol	(	wm8904_handle_t *	handle,
		wm8904_protocol_t	protocol
	)

Parameters

handle	WM8904 handle structure.
protocol	Audio transfer protocol.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetAudioFormat	(	wm8904_handle_t *	handle,
		uint32_t	sysclk,
		uint32_t	sampleRate,
		uint32_t	bitWidth
	)

User should pay attention to the sysclk parameter ,When using external MCLK as system clock source, the value should be frequency of MCLK, when using FLL as system clock source, the value should be frequency of the output of FLL.

Parameters

handle	WM8904 handle structure.
sysclk	system clock source frequency.
sampleRate	Sample rate frequency in Hz.
bitWidth	Audio data bit width.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_CheckAudioFormat	(	wm8904_handle_t *	handle,
		wm8904_audio_format_t *	format,
		uint32_t	mclkFreq
	)

This api is used check the fsRatio setting based on the mclk and sample rate, if fsRatio setting is not correct, it will correct it according to mclk and sample rate.

Parameters

handle	WM8904 handle structure.
format	audio data format
mclkFreq	mclk frequency

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetVolume	(	wm8904_handle_t *	handle,
		uint16_t	volumeLeft,
		uint16_t	volumeRight
	)

The parameter should be from 0 to 63. The resulting volume will be. 0 for -57DB, 63 for 6DB.

Parameters

handle	WM8904 handle structure.
volumeLeft	left channel volume.
volumeRight	right channel volume.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetMute	(	wm8904_handle_t *	handle,
		bool	muteLeft,
		bool	muteRight
	)

Parameters

handle	WM8904 handle structure.
muteLeft	true to mute left channel, false to unmute.
muteRight	true to mute right channel, false to unmute.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SelectLRCPolarity	(	wm8904_handle_t *	handle,
		uint32_t	polarity
	)

Parameters

handle	WM8904 handle structure.
polarity	LRC clock polarity.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_EnableDACTDMMode	(	wm8904_handle_t *	handle,
		wm8904_timeslot_t	timeSlot
	)

Parameters

handle	WM8904 handle structure.
timeSlot	timeslot number.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_EnableADCTDMMode	(	wm8904_handle_t *	handle,
		wm8904_timeslot_t	timeSlot
	)

Parameters

handle	WM8904 handle structure.
timeSlot	timeslot number.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetModulePower	(	wm8904_handle_t *	handle,
		wm8904_module_t	module,
		bool	isEnabled
	)

Parameters

handle	WM8904 handle structure.
module	wm8904 module.
isEnabled	true is power on, false is power down.

Returns: kStatus_WM8904_Success if successful, different code otherwise..

status_t WM8904_SetDACVolume	(	wm8904_handle_t *	handle,
		uint8_t	volume
	)

Parameters

handle	WM8904 handle structure.
volume	volume to be configured.

Returns: kStatus_WM8904_Success if successful, different code otherwise..

status_t WM8904_SetChannelVolume	(	wm8904_handle_t *	handle,
		uint32_t	channel,
		uint32_t	volume
	)

The parameter should be from 0 to 63. The resulting volume will be. 0 for -57dB, 63 for 6DB.

Parameters

handle	codec handle structure.
channel	codec channel.
volume	volume value from 0 -63.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetRecord	(	wm8904_handle_t *	handle,
		uint32_t	recordSource
	)

Parameters

handle	WM8904 handle structure.
recordSource	record source , can be a value of kCODEC_ModuleRecordSourceDifferentialLine, kCODEC_ModuleRecordSourceDifferentialMic, kCODEC_ModuleRecordSourceSingleEndMic, kCODEC_ModuleRecordSourceDigitalMic.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

status_t WM8904_SetRecordChannel	(	wm8904_handle_t *	handle,
		uint32_t	leftRecordChannel,
		uint32_t	rightRecordChannel
	)

Parameters

handle	WM8904 handle structure.
leftRecordChannel	channel number of left record channel when using differential source, channel number of single end left channel when using single end source, channel number of digital mic when using digital mic source.
rightRecordChannel	channel number of right record channel when using differential source, channel number of single end right channel when using single end source.

Returns: kStatus_WM8904_Success if successful, different code otherwise..

status_t WM8904_SetPlay	(	wm8904_handle_t *	handle,
		uint32_t	playSource
	)

Parameters

handle	WM8904 handle structure.
playSource	play source , can be a value of kCODEC_ModuleHeadphoneSourcePGA, kCODEC_ModuleHeadphoneSourceDAC, kCODEC_ModuleLineoutSourcePGA, kCODEC_ModuleLineoutSourceDAC.

Returns: kStatus_WM8904_Success if successful, different code otherwise..

status_t WM8904_SetChannelMute	(	wm8904_handle_t *	handle,
		uint32_t	channel,
		bool	isMute
	)

Parameters

handle	codec handle structure.
channel	codec module name.
isMute	true is mute, false unmute.

Returns: kStatus_WM8904_Success if successful, different code otherwise.

Overview

Data Structures

Macros

Enumerations

Functions

Driver version

Data Structure Documentation

Data Fields

Data Fields

Data Fields

Data Fields

Macro Definition Documentation

Enumeration Type Documentation

Function Documentation