Audio Codec Interface

Abstraction for audio codecs. More...

Data Structures
union	audio_dai_cfg_t
	Digital Audio Interface Configuration. More...
struct	audio_codec_cfg
	Codec configuration parameters. More...
union	audio_property_value_t
	Codec property values. More...

Typedefs
typedef void(*	audio_codec_error_callback_t) (const struct device *dev, uint32_t errors)
	Callback for error interrupt.

Enumerations
enum	audio_pcm_rate_t {   AUDIO_PCM_RATE_8K = 8000 , AUDIO_PCM_RATE_16K = 16000 , AUDIO_PCM_RATE_24K = 24000 , AUDIO_PCM_RATE_32K = 32000 ,   AUDIO_PCM_RATE_44P1K = 44100 , AUDIO_PCM_RATE_48K = 48000 , AUDIO_PCM_RATE_96K = 96000 , AUDIO_PCM_RATE_192K = 192000 }
	PCM audio sample rates. More...
enum	audio_pcm_width_t { AUDIO_PCM_WIDTH_16_BITS = 16 , AUDIO_PCM_WIDTH_20_BITS = 20 , AUDIO_PCM_WIDTH_24_BITS = 24 , AUDIO_PCM_WIDTH_32_BITS = 32 }
	PCM audio sample bit widths. More...
enum	audio_dai_type_t { AUDIO_DAI_TYPE_I2S , AUDIO_DAI_TYPE_INVALID }
	Digital Audio Interface (DAI) type. More...
enum	audio_property_t { AUDIO_PROPERTY_OUTPUT_VOLUME , AUDIO_PROPERTY_OUTPUT_MUTE }
	Codec properties that can be set by audio_codec_set_property(). More...
enum	audio_channel_t {   AUDIO_CHANNEL_FRONT_LEFT , AUDIO_CHANNEL_FRONT_RIGHT , AUDIO_CHANNEL_LFE , AUDIO_CHANNEL_FRONT_CENTER ,   AUDIO_CHANNEL_REAR_LEFT , AUDIO_CHANNEL_REAR_RIGHT , AUDIO_CHANNEL_REAR_CENTER , AUDIO_CHANNEL_SIDE_LEFT ,   AUDIO_CHANNEL_SIDE_RIGHT , AUDIO_CHANNEL_ALL }
	Audio channel identifiers to use in audio_codec_set_property(). More...
enum	audio_codec_error_type {   AUDIO_CODEC_ERROR_OVERCURRENT = BIT(0) , AUDIO_CODEC_ERROR_OVERTEMPERATURE = BIT(1) , AUDIO_CODEC_ERROR_UNDERVOLTAGE = BIT(2) , AUDIO_CODEC_ERROR_OVERVOLTAGE = BIT(3) ,   AUDIO_CODEC_ERROR_DC = BIT(4) }
	Codec error type. More...

Functions
static int	audio_codec_configure (const struct device *dev, struct audio_codec_cfg *cfg)
	Configure the audio codec.
static void	audio_codec_start_output (const struct device *dev)
	Set codec to start output audio playback.
static void	audio_codec_stop_output (const struct device *dev)
	Set codec to stop output audio playback.
static int	audio_codec_set_property (const struct device *dev, audio_property_t property, audio_channel_t channel, audio_property_value_t val)
	Set a codec property defined by audio_property_t.
static int	audio_codec_apply_properties (const struct device *dev)
	Atomically apply any cached properties.
static int	audio_codec_clear_errors (const struct device *dev)
	Clear any codec errors.
static int	audio_codec_register_error_callback (const struct device *dev, audio_codec_error_callback_t cb)
	Register a callback function for codec error.

Detailed Description

Abstraction for audio codecs.

Since

1.13

Version

0.1.0

Typedef Documentation

audio_codec_error_callback_t

audio_codec_error_callback_t

#include <zephyr/audio/codec.h>

Callback for error interrupt.

Parameters

dev	Pointer to the codec device
errors	Device errors (bitmask of audio_codec_error_type values)

Enumeration Type Documentation

audio_channel_t

enum audio_channel_t

#include <zephyr/audio/codec.h>

Audio channel identifiers to use in audio_codec_set_property().

Enumerator
AUDIO_CHANNEL_FRONT_LEFT	Front left channel.
AUDIO_CHANNEL_FRONT_RIGHT	Front right channel.
AUDIO_CHANNEL_LFE	Low frequency effect channel.
AUDIO_CHANNEL_FRONT_CENTER	Front center channel.
AUDIO_CHANNEL_REAR_LEFT	Rear left channel.
AUDIO_CHANNEL_REAR_RIGHT	Rear right channel.
AUDIO_CHANNEL_REAR_CENTER	Rear center channel.
AUDIO_CHANNEL_SIDE_LEFT	Side left channel.
AUDIO_CHANNEL_SIDE_RIGHT	Side right channel.
AUDIO_CHANNEL_ALL	All channels.

audio_codec_error_type

enum audio_codec_error_type

#include <zephyr/audio/codec.h>

Codec error type.

Enumerator
AUDIO_CODEC_ERROR_OVERCURRENT	Output over-current.
AUDIO_CODEC_ERROR_OVERTEMPERATURE	Codec over-temperature.
AUDIO_CODEC_ERROR_UNDERVOLTAGE	Power low voltage.
AUDIO_CODEC_ERROR_OVERVOLTAGE	Power high voltage.
AUDIO_CODEC_ERROR_DC	Output direct-current.

audio_dai_type_t

enum audio_dai_type_t

#include <zephyr/audio/codec.h>

Digital Audio Interface (DAI) type.

Enumerator
AUDIO_DAI_TYPE_I2S	I2S Interface.
AUDIO_DAI_TYPE_INVALID	Other interfaces can be added here.

audio_pcm_rate_t

enum audio_pcm_rate_t

#include <zephyr/audio/codec.h>

PCM audio sample rates.

Enumerator
AUDIO_PCM_RATE_8K	8 kHz sample rate
AUDIO_PCM_RATE_16K	16 kHz sample rate
AUDIO_PCM_RATE_24K	24 kHz sample rate
AUDIO_PCM_RATE_32K	32 kHz sample rate
AUDIO_PCM_RATE_44P1K	44.1 kHz sample rate
AUDIO_PCM_RATE_48K	48 kHz sample rate
AUDIO_PCM_RATE_96K	96 kHz sample rate
AUDIO_PCM_RATE_192K	192 kHz sample rate

audio_pcm_width_t

enum audio_pcm_width_t

#include <zephyr/audio/codec.h>

PCM audio sample bit widths.

Enumerator
AUDIO_PCM_WIDTH_16_BITS	16-bit sample width
AUDIO_PCM_WIDTH_20_BITS	20-bit sample width
AUDIO_PCM_WIDTH_24_BITS	24-bit sample width
AUDIO_PCM_WIDTH_32_BITS	32-bit sample width

audio_property_t

enum audio_property_t

#include <zephyr/audio/codec.h>

Codec properties that can be set by audio_codec_set_property().

Enumerator
AUDIO_PROPERTY_OUTPUT_VOLUME	Output volume.
AUDIO_PROPERTY_OUTPUT_MUTE	Output mute/unmute.

Function Documentation

audio_codec_apply_properties()

static int audio_codec_apply_properties ( const struct device *  dev )

inlinestatic

#include <zephyr/audio/codec.h>

Atomically apply any cached properties.

Following one or more invocations of audio_codec_set_property, that may have been cached by the driver, audio_codec_apply_properties can be invoked to apply all the properties as atomic as possible

Parameters

dev	Pointer to the device structure for codec driver instance.

Returns

0 on success, negative error code on failure

audio_codec_clear_errors()

static int audio_codec_clear_errors ( const struct device *  dev )

inlinestatic

#include <zephyr/audio/codec.h>

Clear any codec errors.

Clear all codec errors. If an error interrupt exists, it will be de-asserted.

Parameters

dev	Pointer to the device structure for codec driver instance.

Returns

0 on success, negative error code on failure

audio_codec_configure()

static int audio_codec_configure ( const struct device *  dev, struct audio_codec_cfg *  cfg  )

inlinestatic

#include <zephyr/audio/codec.h>

Configure the audio codec.

Configure the audio codec device according to the configuration parameters provided as input

Parameters

dev	Pointer to the device structure for codec driver instance.
cfg	Pointer to the structure containing the codec configuration.

Returns

0 on success, negative error code on failure

audio_codec_register_error_callback()

static int audio_codec_register_error_callback ( const struct device *  dev, audio_codec_error_callback_t  cb  )

inlinestatic

#include <zephyr/audio/codec.h>

Register a callback function for codec error.

The callback will be called from a thread, so I2C or SPI operations are safe. However, the thread's stack is limited and defined by the driver. It is currently up to the caller to ensure that the callback does not overflow the stack.

Parameters

dev	Pointer to the audio codec device
cb	The function that should be called when an error is detected fires

Returns

0 if successful, negative errno code if failure.

audio_codec_set_property()

static int audio_codec_set_property ( const struct device *  dev, audio_property_t  property, audio_channel_t  channel, audio_property_value_t  val  )

inlinestatic

#include <zephyr/audio/codec.h>

Set a codec property defined by audio_property_t.

Set a property such as volume level, clock configuration etc.

Parameters

dev	Pointer to the device structure for codec driver instance.
property	The codec property to set
channel	The audio channel for which the property has to be set
val	pointer to a property value of type audio_codec_property_value_t

Returns

0 on success, negative error code on failure

audio_codec_start_output()

static void audio_codec_start_output ( const struct device *  dev )

inlinestatic

#include <zephyr/audio/codec.h>

Set codec to start output audio playback.

Setup the audio codec device to start the audio playback

Parameters

dev	Pointer to the device structure for codec driver instance.

audio_codec_stop_output()

static void audio_codec_stop_output ( const struct device *  dev )

inlinestatic

#include <zephyr/audio/codec.h>

Set codec to stop output audio playback.

Setup the audio codec device to stop the audio playback

Parameters

dev	Pointer to the device structure for codec driver instance.