USBAudioDeviceBase subclass for the Arduino UNO R4 / Nano R4 (Renesas RA4M1, arduino:renesas_uno core). More...

#include <USBAudioDeviceRenesas.h>

Inheritance diagram for USBAudioDeviceRenesas:

Public Member Functions
	USBAudioDeviceRenesas ()=default

	USBAudioDeviceRenesas (USBAudioConfig cfg)

virtual void	addNotifyAudioChange (AudioInfoSupport &bi)
	Adds target to be notified about audio changes.

bool	audiod_control_complete (uint8_t rhport, UsbSetupPacket const &p_request)

bool	audiod_control_xfer_cb (uint8_t rhport, uint8_t stage, UsbSetupPacket const &request)

bool	audiod_deinit (void)

void	audiod_init (void)

uint16_t	audiod_open (uint8_t rhport, UsbInterfaceDescriptorView const &itf_desc, uint8_t const *raw_desc, uint16_t max_len)

void	audiod_reset (uint8_t rhport)

void	audiod_sof_isr (uint8_t rhport, uint32_t frame_count)

bool	audiod_xfer_cb (uint8_t rhport, uint8_t ep_addr, UsbXferResult result, uint32_t xferred_bytes)
	TODO refactor control request handling to separate function and reduce nesting.

virtual AudioInfo	audioInfo () override
	provides the actual input AudioInfo

virtual AudioInfo	audioInfoOut ()

uint16_t	audioPacketSize () const
	One isochronous USB packet size in bytes (same formula as the descriptor builder).

int	available () override
	Bytes of received audio waiting in the RX buffer.

int	availableForWrite () override
	Bytes of free space in the TX buffer.

bool	begin ()
	(Re-)start the USB audio device with the current config.

bool	begin (const USBAudioConfig &cfg)
	Apply a config and start the USB audio device.

BaseBuffer< uint8_t > &	bufferRx () override
	Returns the RX audio buffer (public to match USBAudioDeviceESP32, so sketches using the portable USBAudioStream alias can call it on either platform).

BaseBuffer< uint8_t > &	bufferTx () override
	Returns the TX audio buffer (public to match USBAudioDeviceESP32, so sketches using the portable USBAudioStream alias can call it on either platform).

virtual void	clearNotifyAudioChange ()
	Deletes all change notify subscriptions.

USBAudioConfig	defaultConfig (RxTxMode mode=RXTX_MODE)
	Returns a default configuration pre-filled for the requested direction (RX_MODE, TX_MODE, or RXTX_MODE). Use TX if you write and rx if you want to read audio data. RXTX is for full duplex.

void	end ()
	Stop audio streaming and clear buffers. Does not disconnect USB.

virtual void	flush () override

uint8_t	getAudioCount () const
	Returns the number of audio functions (always 1).

uint16_t	getDescriptor (uint8_t *desc)
	Returns the audio-function descriptor block for use in tud_descriptor_configuration_cb().

uint32_t	getRxTotalBytes () const
	Total bytes received from host via OUT endpoint.

uint32_t	getRxXferCount () const
	Number of times audiod_xfer_cb fired for the OUT endpoint.

uint8_t	getTxBytesPerSample () const
	TX bytes per sample parsed from the descriptor.

uint8_t	getTxChannels () const
	TX channel count parsed from the descriptor.

uint32_t	getTxFifoReadTotal () const

uint16_t	getTxFrameBytesLast () const

uint8_t	getTxInterval () const
	TX isochronous interval (bInterval) parsed from the descriptor.

uint32_t	getTxSampleRate () const
	TX sample rate parsed from the descriptor (must be non-zero for flow control).

uint32_t	getTxXferCount () const
	Number of times audiod_xfer_cb fired for the IN endpoint.

uint32_t	getTxXferredLast () const

bool	isEpInEnabled () const
	Returns true if the IN endpoint is enabled.

bool	isEpInFlowControlEnabled () const
	Returns true if IN endpoint flow control is enabled. When on, the per-frame isochronous packet size is varied so non-integer sample-per- frame rates (e.g. 44100 Hz) are delivered at the exact average rate.

bool	isEpOutEnabled () const
	Returns true if the OUT endpoint is enabled.

bool	isFeedbackEpEnabled () const
	Returns true if the feedback endpoint is enabled. Only meaningful in pure RX (OUT-only) mode: with an IN endpoint present the host uses the TX stream as implicit feedback instead.

bool	isInterruptEpEnabled () const
	Returns true if the interrupt endpoint is enabled.

bool	isMute (uint8_t channel=0) const
	Returns the current mute state for the given channel.

bool	isNotifyActive ()
	Checks if the automatic AudioInfo update is active.

bool	isStreamingActive () const
	Returns true if either IN or OUT streaming endpoint is open.

bool	isStreamingActiveRx () const
	Returns true if the host has opened the OUT (playback) stream.

bool	isStreamingActiveTx () const
	Returns true if the host has opened the IN (capture) stream.

bool	isTxXferArmed () const
	True if the initial isochronous IN transfer was armed successfully.

bool	mounted ()
	Returns true if the device is mounted by the USB host.

uint8_t	numInterfaces () const
	Total number of USB interfaces claimed by the audio function (1 AC + 1 or 2 AS), for use in the bNumInterfaces field of the configuration descriptor.

	operator bool () override
	Returns true when begin() has been called and the USB host has mounted the device.

size_t	readBytes (uint8_t *buffer, size_t bufsize)
	Receive audio data from the host (host → device, speaker/playback).

virtual size_t	readSilence (uint8_t *buffer, size_t length)
	Source to generate silence: just sets the buffer to 0.

virtual bool	removeNotifyAudioChange (AudioInfoSupport &bi)
	Removes a target in order not to be notified about audio changes.

void	setAudioFeedbackFormatCorrectionCallback (std::function< bool(USBAudioDeviceBase *, uint8_t)> cb)
	Register a callback for audio feedback format correction events.

void	setAudioFeedbackParamsCallback (std::function< void(USBAudioDeviceBase , uint8_t, uint8_t, audio_feedback_params_t )> cb)
	Register a callback for audio feedback parameter events.

void	setAudioInfo (AudioInfo info) override
	Change the sample rate and notify the host.

void	setFbDoneCallback (std::function< void(USBAudioDeviceBase *, uint8_t)> cb)
	Register a callback for feedback done events.

void	setGetReqEpCallback (std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb)
	Register a callback for GET requests on an endpoint.

void	setGetReqItfCallback (std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb)
	Register a callback for GET requests on the interface.

void	setIntDoneCallback (std::function< void(USBAudioDeviceBase *, uint8_t)> cb)
	Register a callback for interrupt done events.

void	setItfCloseEpCallback (std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb)
	Register a callback for interface close endpoint events.

bool	setMute (bool m, uint8_t channel=0)
	Set the mute state for a channel and notify the host.

void	setMuteCallback (std::function< void(bool, uint8_t)> cb)
	Register a callback invoked when the host (or device) changes the mute state.

void	setNotifyActive (bool flag)
	Deactivate/Reactivate automatic AudioInfo updates: (default is active)

void	setReqEntityCallback (std::function< bool(USBAudioDeviceBase *, uint8_t)> cb)
	Register a callback for entity requests.

void	setReqEntityCallback (std::function< bool(USBAudioDeviceBase , uint8_t, UsbSetupPacket const &, uint8_t )> cb)
	Register a callback for entity set requests.

void	setReqEpCallback (std::function< bool(USBAudioDeviceBase , uint8_t, UsbSetupPacket const &, uint8_t )> cb)
	Register a callback for endpoint set requests.

void	setReqItfCallback (std::function< bool(USBAudioDeviceBase , uint8_t, UsbSetupPacket const &, uint8_t )> cb)
	Register a callback for interface set requests.

void	setRxDoneCallback (std::function< bool(USBAudioDeviceBase , uint8_t, audiod_function_t , uint16_t)> cb)
	Register a callback for RX done events.

void	setSampleRateCallback (std::function< void(uint32_t)> cb)
	Register a callback invoked when the host (or device) changes the sample rate.

void	setStreamingStateCallback (std::function< void(bool, bool)> cb)
	Register a callback invoked when the streaming state changes. Fires when the host opens or closes a streaming interface (SET_INTERFACE alt=1 / alt=0).

void	setTudAudioSetItfCallback (std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb)
	Register a callback for interface set requests.

void	setTxDoneCallback (std::function< bool(USBAudioDeviceBase , uint8_t, audiod_function_t )> cb)
	Register a callback for TX done events.

bool	setVolume (float vol, uint8_t channel)
	Set the volume for a channel and notify the host.

bool	setVolume (float volume) override
	sets the volume for the master channel (channel 0)

void	setVolumeCallback (std::function< void(float, uint8_t)> cb)
	Register a callback invoked when the host (or device) changes the volume.

void	setWriteBufferSize (int size)

float	volume () override
	gets the volume for the master channel (channel 0)

float	volume (uint8_t channel)
	Returns the current volume for the given channel.

size_t	write (const uint8_t *data, size_t len)
	Send audio data to the host (device → host, microphone/capture). Silently discards data when the host has not opened the capture device (alt=0) so StreamCopy doesn't report write errors before recording.

virtual size_t	write (uint8_t ch) override

virtual void	writeSilence (size_t len)
	Writes len bytes of silence (=0).

Static Public Member Functions
static USBAudioDeviceBase &	activeInstance ()
	Returns the most-recently-constructed instance (base or subclass).

static uint8_t *	customDescriptorCallback (uint8_t itfnum, size_t len, uint8_t num_interfaces)

static USBAudioDeviceRenesas &	getActualInstance ()

Protected Member Functions
bool	activateEndpoint (uint8_t rhport, const UsbEndpointDescriptorView &desc_ep, UsbDir dir=UsbDir::In)

bool	audiod_calc_tx_packet_sz (audiod_function_t *audio)

bool	audiod_control_request (uint8_t rhport, UsbSetupPacket const &p_request)

bool	audiod_fb_send (audiod_function_t *audio)

bool	audiod_get_AS_interface_index (uint8_t itf, audiod_function_t audio, uint8_t idxItf, uint8_t const **pp_desc_int)

bool	audiod_get_AS_interface_index_global (uint8_t itf, uint8_t func_id, uint8_t idxItf, uint8_t const **pp_desc_int)

bool	audiod_get_interface (uint8_t rhport, UsbSetupPacket const &p_request)

void	audiod_parse_flow_control_params (audiod_function_t audio, uint8_t const p_desc)

bool	audiod_set_fb_params_freq (audiod_function_t *audio, uint32_t sample_freq, uint32_t mclk_freq)

bool	audiod_set_interface (uint8_t rhport, UsbSetupPacket const &p_request)

uint16_t	audiod_tx_packet_size_fc (audiod_function_t *audio)

bool	audiod_verify_entity_exists (uint8_t itf, uint8_t entityID, uint8_t *func_id)

bool	audiod_verify_ep_exists (uint8_t ep, uint8_t *func_id)

bool	audiod_verify_itf_exists (uint8_t itf, uint8_t *func_id)

USBAudioBackend &	backend () override
	Returns the backend used for all raw USB-stack calls (TinyUSB today, or a future native-HAL backend). Must be overridden by every platform subclass; the returned reference must outlive this object.

bool	beginUSB () override
	Starts the RA4M1's native USB peripheral via the core's `__USBStart()`. Endpoint addresses are fixed (see USB_AUDIO_EP_* in USBAudioConfig.h) since this core has no dynamic endpoint allocator; VID/PID/manufacturer/product/serial in USBAudioConfig are not applicable here – the whole composite device (CDC + HID + Audio) shares the one board-level identity the core's USB.cpp compiles in.

void	closeEpIn (uint8_t rhport, audiod_function_t *audio, uint8_t itf, UsbSetupPacket const &p_request)

void	closeEpOut (uint8_t rhport, audiod_function_t *audio, uint8_t itf, UsbSetupPacket const &p_request)

bool	configChanged (const USBAudioConfig &n)

uint16_t	getCtrlBufSz (uint8_t fn) const

uint16_t	getDescLen (uint8_t fn) const

float	getVolumeExt (uint8_t channel) const
	Returns the effective volume for a per-channel index (1-based). Combines master volume (index 0) with per-channel volume and mute.

bool	handleClockSourceGet (uint8_t rhport, UsbSetupPacket const &p_request, uint8_t *cb)

bool	handleEndpointRequest (uint8_t rhport, UsbSetupPacket const &p_request)

bool	handleEntityRequest (uint8_t rhport, UsbSetupPacket const &p_request, uint8_t entityID)

bool	handleFeatureUnitGet (uint8_t rhport, UsbSetupPacket const &p_request, uint8_t *cb)

bool	handleInterfaceRequest (uint8_t rhport, UsbSetupPacket const &p_request)

bool	isFeatureUnit (uint8_t id) const
	Returns true if the given entity ID is a Feature Unit (FU1 or FU2).

virtual int	not_supported (int out, const char *msg="")

void	notifyAudioChange (AudioInfo info)

void	notifyStreamingState ()

bool	openEndpointsForAltSetting (uint8_t rhport, audiod_function_t *audio, uint8_t func_id, uint8_t itf, uint8_t alt)

void	openEpFeedback (audiod_function_t *audio, const UsbEndpointDescriptorView &desc_ep)

void	openEpIn (uint8_t rhport, audiod_function_t audio, uint8_t itf, const UsbEndpointDescriptorView &desc_ep, uint8_t const p_desc_for_params)

void	openEpOut (uint8_t rhport, audiod_function_t *audio, uint8_t itf, const UsbEndpointDescriptorView &desc_ep)

uint16_t	packetSize () const

template<typename T >
void	processVolume (T *data, size_t sample_count)

void	processVolume (uint8_t *data, size_t len)
	Process audio data for volume control.

void	refillReadBuffer ()
	Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read()

void	resizeBuffers () override
	Resize buffers as block pools: block size = one USB frame at the current sample rate, block count = fifo_packets.

void	sendInterruptNotification (uint8_t ctrlSel, uint8_t channel, uint8_t entityID)
	Send a UAC2 status/change notification via the AC interrupt EP.

void	serviceTinyUSB () override
	No-op: `_usbfs_interrupt_handler()` in the core's USB.cpp already calls `tud_task()` directly from the USB ISR on every interrupt, so polling it again here would be redundant (tud_task() is not re-entrant).

void	setConfig (const USBAudioConfig &cfg)
	Set the USB audio configuration (use begin(cfg) instead).

void	setSampleRate (uint32_t rate)
	Device-initiated sample rate change.

void	setupFeedback (audiod_function_t *audio, uint8_t func_id, uint8_t alt)

void	tud_audio_feedback_interval_isr (uint8_t func_id, uint32_t, uint8_t frame_shift)

Static Protected Member Functions
static int16_t	floatToUac2 (float vol)
	Convert linear volume (0.0–1.0) to UAC2 int16 (1/256 dB). Linear mapping: 0.0 → -100 dB (min), 1.0 → 0 dB (max).

static constexpr size_t	getResetSize ()

static bool	isPowerOfTwo (uint32_t value)

static bool	isValidBitsPerSample (uint8_t bps)

static uint8_t	log2Floor (uint32_t value)

static float	uac2ToFloat (int16_t v)
	Convert UAC2 int16 (1/256 dB) to linear volume (0.0–1.0). Linear mapping within the -100..0 dB range reported by GET_RANGE.

Protected Attributes
int	_timeout = 10

USBAudioConfig	active_config_

std::vector< audiod_function_t >	audiod_fct_

USBAudioBackendTinyUSB	backend_impl_

bool	begin_called_ = false

RingBufferSPSC< uint8_t >	buffer_rx_

RingBufferSPSC< uint8_t >	buffer_tx_

USBAudioConfig	config_

std::vector< uint16_t >	ctrl_buf_sz_

std::vector< uint16_t >	desc_len_

USBAudio2DescriptorBuilder	descr_builder {config_}

std::function< void(USBAudioDeviceBase *, uint8_t func_id)>	fb_done_cb_

std::function< bool(USBAudioDeviceBase *, uint8_t rhport, UsbSetupPacket const &)>	get_req_ep_cb_

std::function< bool(USBAudioDeviceBase *, uint8_t rhport, UsbSetupPacket const &)>	get_req_itf_cb_

AudioInfo	info

std::function< void(USBAudioDeviceBase *, uint8_t rhport)>	int_done_cb_

uint8_t	int_notify_buf_ [6] = {}

bool	is_active_ = false

bool	is_notify_active = true

bool	is_started_ = false

std::vector< bool >	mute_

std::function< void(bool, uint8_t)>	mute_cb_

Vector< AudioInfoSupport * >	notify_vector

std::function< bool(USBAudioDeviceBase *, uint8_t func_id)>	req_entity_cb_

std::function< bool(USBAudioDeviceBase , uint8_t rhport, audiod_function_t , uint16_t xferred_bytes)>	rx_done_cb_

volatile uint32_t	rx_total_bytes_ = 0

std::function< void(uint32_t)>	sample_rate_cb_

std::function< void(bool, bool)>	streaming_state_cb_

RingBuffer< uint8_t >	tmp_in {0}

RingBuffer< uint8_t >	tmp_out {0}

std::function< bool(USBAudioDeviceBase *, uint8_t func_id)>	tud_audio_feedback_format_correction_cb_

std::function< void(USBAudioDeviceBase , uint8_t func_id, uint8_t alt_itf, audio_feedback_params_t feedback_param)>	tud_audio_feedback_params_cb_

std::function< bool(USBAudioDeviceBase *, uint8_t rhport, UsbSetupPacket const &p_request)>	tud_audio_set_itf_cb_

std::function< bool(USBAudioDeviceBase *, uint8_t rhport, UsbSetupPacket const &p_request)>	tud_audio_set_itf_close_EP_cb_

std::function< bool(USBAudioDeviceBase , uint8_t rhport, UsbSetupPacket const &p_request, uint8_t pBuff)>	tud_audio_set_req_entity_cb_

std::function< bool(USBAudioDeviceBase , uint8_t rhport, UsbSetupPacket const &p_request, uint8_t pBuff)>	tud_audio_set_req_ep_cb_

std::function< bool(USBAudioDeviceBase , uint8_t rhport, UsbSetupPacket const &p_request, uint8_t pBuff)>	tud_audio_set_req_itf_cb_

std::function< bool(USBAudioDeviceBase , uint8_t rhport, audiod_function_t )>	tx_done_cb_

volatile uint32_t	tx_fifo_read_total_ = 0

volatile uint16_t	tx_frame_bytes_last_ = 0

bool	tx_xfer_armed_ = false

volatile uint32_t	tx_xferred_last_ = 0

bool	usb_task_active_ = false

std::vector< float >	volume_

std::function< void(float, uint8_t)>	volume_cb_

float	volume_value = 1.0f

int	write_buffer_size = MAX_SINGLE_CHARS

volatile uint32_t	xfer_cb_rx_count_ = 0

volatile uint32_t	xfer_cb_tx_count_ = 0

Static Protected Attributes
static constexpr int16_t	kVolumeMinDb256 = -25600
	Convert AudioTools volume (0.0–1.0) to UAC2 int16 (1/256 dB). 0.0 maps to 0x8000 (silence), 1.0 maps to 0 (0 dB).

static USBAudioDeviceBase *	s_active_ = nullptr

Friends
class	Emulated_TinyUSB

Detailed Description

USBAudioDeviceBase subclass for the Arduino UNO R4 / Nano R4 (Renesas RA4M1, arduino:renesas_uno core).

The core's own USB.cpp runs TinyUSB internally (via its RUSB2 Device Controller Driver), so USBAudioBackendTinyUSB is reused as-is here – this class only supplies the platform-specific descriptor-registration glue, matching the pattern of USBAudioDeviceESP32/USBAudioDeviceTinyUSB.

Requires a core with the <tt>__USBGetCustomInterfaceDescriptor</tt> hook

Stock arduino:renesas_uno (as of release 1.6.0) builds one fixed composite descriptor (CDC + HID + MSD) with no extension point for a third-party class driver – this class needs the USB.h/USB.cpp hook that lets an external interface append itself (a weak __USBGetCustomInterfaceDescriptor() callback, checked and invoked from __SetupUSBDescriptor() the same way HID's __USBGetHIDReport() already is). Without that hook in the core, this file will still compile but the Audio interface will silently never appear in the composite descriptor.

Requires building with <tt>-DNO_USB</tt>

main.cpp calls __USBStart() (which builds and freezes the composite descriptor) automatically at boot, before the sketch's setup() runs – unless the board defines NO_USB (UNO R4 WiFi already does; UNO R4 Minima/Nano R4 do not). Since the descriptor is built lazily but then cached forever (usbd_desc_cfg is only ever assigned once), our Audio interface must be registered before the first build, which means beginUSB() here has to be the one calling __USBStart() – after the sketch's setup() has configured the audio format via begin(). On boards that auto-start USB before setup() runs (Minima/Nano R4), add -DNO_USB yourself, e.g. via arduino-cli compile --build-property "build.extra_flags=-DNO_USB" or a boards.local.txt/platform.local.txt override. With NO_USB defined, the Serial macro maps to a plain UART instead of native-USB CDC – use SerialUSB explicitly if you also want USB serial alongside audio (see usb-tx.ino's composite-device pattern).

Note: I recommend to use the USBAudioStream type alias instead of this class directly, so that the code is portable to other platforms.

Author: Phil Schatzmann

Copyright: GPLv3

Constructor & Destructor Documentation

◆ USBAudioDeviceRenesas() [1/2]

USBAudioDeviceRenesas ( )

default

◆ USBAudioDeviceRenesas() [2/2]

USBAudioDeviceRenesas ( USBAudioConfig cfg )

inline

Member Function Documentation

◆ activateEndpoint()

bool activateEndpoint	(	uint8_t	rhport,
		const UsbEndpointDescriptorView &	desc_ep,
		UsbDir	dir = `UsbDir::In`
	)

inlineprotectedinherited

◆ activeInstance()

static USBAudioDeviceBase & activeInstance ( )

inlinestaticinherited

Returns the most-recently-constructed instance (base or subclass).

Set in the constructor via s_active_, so usbd_app_driver_get_cb() and the static process() trampoline can reach the right object without a singleton.

◆ addNotifyAudioChange()

virtual void addNotifyAudioChange ( AudioInfoSupport & bi )

inlinevirtualinherited

Adds target to be notified about audio changes.

Reimplemented in CodecNOP, EncodedAudioOutput, EncodedAudioStream, AACDecoderFDK, DecoderBasic, CodecChain, MP3DecoderHelix, MP3DecoderMAD, OggContainerDecoder, RTSPClient< TcpClient, UdpSocket >, Pipeline, and Pipeline::ModifyingStreamAdapter.

◆ audiod_calc_tx_packet_sz()

bool audiod_calc_tx_packet_sz ( audiod_function_t * audio )

inlineprotectedinherited

◆ audiod_control_complete()

bool audiod_control_complete	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request
	)

inlineinherited

◆ audiod_control_request()

bool audiod_control_request	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request
	)

inlineprotectedinherited

◆ audiod_control_xfer_cb()

bool audiod_control_xfer_cb	(	uint8_t	rhport,
		uint8_t	stage,
		UsbSetupPacket const &	request
	)

inlineinherited

◆ audiod_deinit()

bool audiod_deinit ( void )

inlineinherited

◆ audiod_fb_send()

bool audiod_fb_send ( audiod_function_t * audio )

inlineprotectedinherited

◆ audiod_get_AS_interface_index()

bool audiod_get_AS_interface_index	(	uint8_t	itf,
		audiod_function_t *	audio,
		uint8_t *	idxItf,
		uint8_t const **	pp_desc_int
	)

inlineprotectedinherited

◆ audiod_get_AS_interface_index_global()

bool audiod_get_AS_interface_index_global	(	uint8_t	itf,
		uint8_t *	func_id,
		uint8_t *	idxItf,
		uint8_t const **	pp_desc_int
	)

inlineprotectedinherited

◆ audiod_get_interface()

bool audiod_get_interface	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request
	)

inlineprotectedinherited

◆ audiod_init()

void audiod_init ( void )

inlineinherited

◆ audiod_open()

uint16_t audiod_open	(	uint8_t	rhport,
		UsbInterfaceDescriptorView const &	itf_desc,
		uint8_t const *	raw_desc,
		uint16_t	max_len
	)

inlineinherited

◆ audiod_parse_flow_control_params()

void audiod_parse_flow_control_params	(	audiod_function_t *	audio,
		uint8_t const *	p_desc
	)

inlineprotectedinherited

◆ audiod_reset()

void audiod_reset ( uint8_t rhport )

inlineinherited

◆ audiod_set_fb_params_freq()

bool audiod_set_fb_params_freq	(	audiod_function_t *	audio,
		uint32_t	sample_freq,
		uint32_t	mclk_freq
	)

inlineprotectedinherited

◆ audiod_set_interface()

bool audiod_set_interface	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request
	)

inlineprotectedinherited

◆ audiod_sof_isr()

void audiod_sof_isr	(	uint8_t	rhport,
		uint32_t	frame_count
	)

inlineinherited

◆ audiod_tx_packet_size_fc()

uint16_t audiod_tx_packet_size_fc ( audiod_function_t * audio )

inlineprotectedinherited

◆ audiod_verify_entity_exists()

bool audiod_verify_entity_exists	(	uint8_t	itf,
		uint8_t	entityID,
		uint8_t *	func_id
	)

inlineprotectedinherited

◆ audiod_verify_ep_exists()

bool audiod_verify_ep_exists	(	uint8_t	ep,
		uint8_t *	func_id
	)

inlineprotectedinherited

◆ audiod_verify_itf_exists()

bool audiod_verify_itf_exists	(	uint8_t	itf,
		uint8_t *	func_id
	)

inlineprotectedinherited

◆ audiod_xfer_cb()

bool audiod_xfer_cb	(	uint8_t	rhport,
		uint8_t	ep_addr,
		UsbXferResult	result,
		uint32_t	xferred_bytes
	)

inlineinherited

TODO refactor control request handling to separate function and reduce nesting.

◆ audioInfo()

virtual AudioInfo audioInfo ( )

inlineoverridevirtualinherited

provides the actual input AudioInfo

Implements AudioInfoSupport.

Reimplemented in JupyterAudioT< T >, MozziStream, TimerCallbackAudioStream, EncodedAudioStream, PureDataStream, AdapterAudioOutputToAudioStream, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, and InputMerge< T >.

◆ audioInfoOut()

virtual AudioInfo audioInfoOut ( )

inlinevirtualinherited

provides the actual output AudioInfo: this is usually the same as audioInfo() unless we use a transforming stream

Reimplemented in MP3EncoderShine, PureDataStream, PWMAudioOutput< PWMDriverT >, ChannelFormatConverterStreamT< T >, ChannelFormatConverterStream, NumberFormatConverterStreamT< TFrom, TTo >, NumberFormatConverterStream, FormatConverterStream, Pipeline, ResampleStream, and ResampleStreamT< TInterpolator >.

◆ audioPacketSize()

uint16_t audioPacketSize ( ) const

inlineinherited

One isochronous USB packet size in bytes (same formula as the descriptor builder).

◆ available()

int available ( )

inlineoverridevirtualinherited

Bytes of received audio waiting in the RX buffer.

Reimplemented from BaseStream.

◆ availableForWrite()

int availableForWrite ( )

inlineoverridevirtualinherited

Bytes of free space in the TX buffer.

Reimplemented from BaseStream.

◆ backend()

USBAudioBackend & backend ( )

inlineoverrideprotectedvirtual

Returns the backend used for all raw USB-stack calls (TinyUSB today, or a future native-HAL backend). Must be overridden by every platform subclass; the returned reference must outlive this object.

Implements USBAudioDeviceBase.

◆ begin() [1/2]

bool begin ( )

inlinevirtualinherited

(Re-)start the USB audio device with the current config.

Safe to call more than once: descriptor building, FIFO allocation, and USB stack startup only run on the first call. Subsequent calls just push the current volume/mute/sample-rate state to the host.

Returns: true on success.

Reimplemented from BaseStream.

◆ begin() [2/2]

bool begin ( const USBAudioConfig & cfg )

inlineinherited

Apply a config and start the USB audio device.

Before the first begin() all fields may be changed freely. Once started, only the sample rate can change at runtime (via setSampleRate()); descriptor-level fields like channels, bit depth, and endpoint addresses are fixed by the USB enumeration.

Parameters

cfg	Audio configuration.

Returns: true on success.

◆ beginUSB()

bool beginUSB ( )

inlineoverrideprotectedvirtual

Starts the RA4M1's native USB peripheral via the core's __USBStart(). Endpoint addresses are fixed (see USB_AUDIO_EP_* in USBAudioConfig.h) since this core has no dynamic endpoint allocator; VID/PID/manufacturer/product/serial in USBAudioConfig are not applicable here – the whole composite device (CDC + HID + Audio) shares the one board-level identity the core's USB.cpp compiles in.

Implements USBAudioDeviceBase.

◆ bufferRx()

BaseBuffer< uint8_t > & bufferRx ( )

inlineoverridevirtual

Returns the RX audio buffer (public to match USBAudioDeviceESP32, so sketches using the portable USBAudioStream alias can call it on either platform).

Implements USBAudioDeviceBase.

◆ bufferTx()

BaseBuffer< uint8_t > & bufferTx ( )

inlineoverridevirtual

Returns the TX audio buffer (public to match USBAudioDeviceESP32, so sketches using the portable USBAudioStream alias can call it on either platform).

Implements USBAudioDeviceBase.

◆ clearNotifyAudioChange()

virtual void clearNotifyAudioChange ( )

inlinevirtualinherited

Deletes all change notify subscriptions.

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

◆ closeEpIn()

void closeEpIn	(	uint8_t	rhport,
		audiod_function_t *	audio,
		uint8_t	itf,
		UsbSetupPacket const &	p_request
	)

inlineprotectedinherited

◆ closeEpOut()

void closeEpOut	(	uint8_t	rhport,
		audiod_function_t *	audio,
		uint8_t	itf,
		UsbSetupPacket const &	p_request
	)

inlineprotectedinherited

◆ configChanged()

bool configChanged ( const USBAudioConfig & n )

inlineprotectedinherited

◆ customDescriptorCallback()

static uint8_t * customDescriptorCallback	(	uint8_t	itfnum,
		size_t *	len,
		uint8_t *	num_interfaces
	)

inlinestatic

Called by the core's __SetupUSBDescriptor() (via the weak __USBGetCustomInterfaceDescriptor hook defined below) to fetch our UAC2 descriptor block. itfnum is the first free (0-based) interface number – CDC/HID/MSD have already claimed lower numbers by the time this runs, matching the same running-interface-index handoff used by USBAudioDeviceESP32::descriptorCallback.

◆ defaultConfig()

USBAudioConfig defaultConfig ( RxTxMode mode = RXTX_MODE )

inlineinherited

Returns a default configuration pre-filled for the requested direction (RX_MODE, TX_MODE, or RXTX_MODE). Use TX if you write and rx if you want to read audio data. RXTX is for full duplex.

Parameters

mode	Audio direction.

◆ end()

void end ( )

inlinevirtualinherited

Stop audio streaming and clear buffers. Does not disconnect USB.

Reimplemented from BaseStream.

◆ floatToUac2()

static int16_t floatToUac2 ( float vol )

inlinestaticprotectedinherited

Convert linear volume (0.0–1.0) to UAC2 int16 (1/256 dB). Linear mapping: 0.0 → -100 dB (min), 1.0 → 0 dB (max).

◆ flush()

virtual void flush ( )

inlineoverridevirtualinherited

Reimplemented from Print.

Reimplemented in PureDataStream, URLStreamBufferedT< T >, URLStreamBufferedT< ICYStream >, ReformatBaseStream, AudioStreamWrapper, ResampleStream, EncodedAudioStream, URLStream, BufferedTaskStream, I2SStream, MemoryStream, RingBufferStream, GeneratedSoundStream< T >, GeneratedSoundStream< int16_t >, and BufferedStream.

◆ getActualInstance()

static USBAudioDeviceRenesas & getActualInstance ( )

inlinestatic

◆ getAudioCount()

uint8_t getAudioCount ( ) const

inlineinherited

Returns the number of audio functions (always 1).

◆ getCtrlBufSz()

uint16_t getCtrlBufSz ( uint8_t fn ) const

inlineprotectedinherited

◆ getDescLen()

uint16_t getDescLen ( uint8_t fn ) const

inlineprotectedinherited

◆ getDescriptor()

uint16_t getDescriptor ( uint8_t * desc )

inlineinherited

Returns the audio-function descriptor block for use in tud_descriptor_configuration_cb().

Call begin() first so that the config is known. The returned pointer points to an internal static buffer that is valid for the lifetime of the program; copy it into your configuration descriptor buffer.

Parameters

[out] len Total byte count of the returned block.

Returns: Pointer to the audio function descriptor bytes.

bool handleClockSourceGet	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request,
		uint8_t *	cb
	)

inlineprotectedinherited

◆ handleEndpointRequest()

bool handleEndpointRequest	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request
	)

inlineprotectedinherited

◆ handleEntityRequest()

bool handleEntityRequest	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request,
		uint8_t	entityID
	)

inlineprotectedinherited

◆ handleFeatureUnitGet()

bool handleFeatureUnitGet	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request,
		uint8_t *	cb
	)

inlineprotectedinherited

◆ handleInterfaceRequest()

bool handleInterfaceRequest	(	uint8_t	rhport,
		UsbSetupPacket const &	p_request
	)

Returns true if the interrupt endpoint is enabled.

◆ isMute()

bool isMute ( uint8_t channel = 0 ) const

inlineinherited

Returns the current mute state for the given channel.

Parameters

channel 0 = master, 1..N = per-channel.

◆ isNotifyActive()

bool isNotifyActive ( )

inlineinherited

Checks if the automatic AudioInfo update is active.

◆ isPowerOfTwo()

static bool isPowerOfTwo ( uint32_t value )

inlinestaticprotectedinherited

◆ isStreamingActive()

bool isStreamingActive ( ) const

inlineinherited

Returns true if either IN or OUT streaming endpoint is open.

◆ isStreamingActiveRx()

bool isStreamingActiveRx ( ) const

inlineinherited

Returns true if the host has opened the OUT (playback) stream.

◆ isStreamingActiveTx()

bool isStreamingActiveTx ( ) const

inlineinherited

Returns true if the host has opened the IN (capture) stream.

◆ isTxXferArmed()

bool isTxXferArmed ( ) const

inlineinherited

True if the initial isochronous IN transfer was armed successfully.

◆ isValidBitsPerSample()

static bool isValidBitsPerSample ( uint8_t bps )

inlinestaticprotectedinherited

◆ log2Floor()

static uint8_t log2Floor ( uint32_t value )

inlinestaticprotectedinherited

◆ mounted()

bool mounted ( )

inlineinherited

Returns true if the device is mounted by the USB host.

◆ not_supported()

virtual int not_supported	(	int	out,
		const char *	msg = `""`
	)

inlineprotectedvirtualinherited

◆ notifyAudioChange()

void notifyAudioChange ( AudioInfo info )

inlineprotectedinherited

◆ notifyStreamingState()

void notifyStreamingState ( )

inlineprotectedinherited

◆ numInterfaces()

uint8_t numInterfaces ( ) const

inlineinherited

Total number of USB interfaces claimed by the audio function (1 AC + 1 or 2 AS), for use in the bNumInterfaces field of the configuration descriptor.

◆ openEndpointsForAltSetting()

bool openEndpointsForAltSetting	(	uint8_t	rhport,
		audiod_function_t *	audio,
		uint8_t	func_id,
		uint8_t	itf,
		uint8_t	alt
	)

inlineprotectedinherited

◆ openEpFeedback()

void openEpFeedback	(	audiod_function_t *	audio,
		const UsbEndpointDescriptorView &	desc_ep
	)

inlineprotectedinherited

◆ openEpIn()

void openEpIn	(	uint8_t	rhport,
		audiod_function_t *	audio,
		uint8_t	itf,
		const UsbEndpointDescriptorView &	desc_ep,
		uint8_t const *	p_desc_for_params
	)

inlineprotectedinherited

◆ openEpOut()

void openEpOut	(	uint8_t	rhport,
		audiod_function_t *	audio,
		uint8_t	itf,
		const UsbEndpointDescriptorView &	desc_ep
	)

inlineprotectedinherited

◆ operator bool()

operator bool ( )

inlineoverridevirtualinherited

Returns true when begin() has been called and the USB host has mounted the device.

Reimplemented from AudioStream.

◆ packetSize()

uint16_t packetSize ( ) const

inlineprotectedinherited

◆ processVolume() [1/2]

template<typename T >

void processVolume	(	T *	data,
		size_t	sample_count
	)

inlineprotectedinherited

◆ processVolume() [2/2]

void processVolume	(	uint8_t *	data,
		size_t	len
	)

inlineprotectedinherited

Process audio data for volume control.

◆ readBytes()

size_t readBytes	(	uint8_t *	buffer,
		size_t	bufsize
	)

inlinevirtualinherited

Receive audio data from the host (host → device, speaker/playback).

Reimplemented from AudioStream.

◆ readSilence()

virtual size_t readSilence	(	uint8_t *	buffer,
		size_t	length
	)

inlinevirtualinherited

Source to generate silence: just sets the buffer to 0.

◆ refillReadBuffer()

void refillReadBuffer ( )

inlineprotectedinherited

Refill small read buffer (e.g. 8 bytes) to avoid single byte reads when calling read()

◆ removeNotifyAudioChange()

virtual bool removeNotifyAudioChange ( AudioInfoSupport & bi )

inlinevirtualinherited

Removes a target in order not to be notified about audio changes.

Reimplemented in RTSPClient< TcpClient, UdpSocket >.

◆ resizeBuffers()

void resizeBuffers ( )

inlineoverrideprotectedvirtual

Resize buffers as block pools: block size = one USB frame at the current sample rate, block count = fifo_packets.

Implements USBAudioDeviceBase.

◆ sendInterruptNotification()

void sendInterruptNotification	(	uint8_t	ctrlSel,
		uint8_t	channel,
		uint8_t	entityID
	)

inlineprotectedinherited

Send a UAC2 status/change notification via the AC interrupt EP.

6-byte message: bInfo(1) bAttribute(1) wValue(2) wIndex(2). The host will re-query the affected control with GET_CUR.

Parameters

ctrlSel	Control selector (e.g. AUDIO_FU_CTRL_VOLUME).
channel	Channel number (0 = master).
entityID	Target entity (Feature Unit or Clock Source).

◆ serviceTinyUSB()

void serviceTinyUSB ( )

inlineoverrideprotectedvirtual

No-op: _usbfs_interrupt_handler() in the core's USB.cpp already calls tud_task() directly from the USB ISR on every interrupt, so polling it again here would be redundant (tud_task() is not re-entrant).

Implements USBAudioDeviceBase.

◆ setAudioFeedbackFormatCorrectionCallback()

void setAudioFeedbackFormatCorrectionCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t)> cb )

inlineinherited

Register a callback for audio feedback format correction events.

Parameters

cb	Callback function.

◆ setAudioFeedbackParamsCallback()

void setAudioFeedbackParamsCallback ( std::function< void(USBAudioDeviceBase *, uint8_t, uint8_t, audio_feedback_params_t *)> cb )

inlineinherited

Register a callback for audio feedback parameter events.

Parameters

cb	Callback function.

◆ setAudioInfo()

void setAudioInfo ( AudioInfo info )

inlineoverridevirtualinherited

Change the sample rate and notify the host.

Reimplemented from AudioStream.

◆ setConfig()

void setConfig ( const USBAudioConfig & cfg )

inlineprotectedinherited

Set the USB audio configuration (use begin(cfg) instead).

◆ setFbDoneCallback()

void setFbDoneCallback ( std::function< void(USBAudioDeviceBase *, uint8_t)> cb )

inlineinherited

Register a callback for feedback done events.

Parameters

cb	Callback function.

◆ setGetReqEpCallback()

void setGetReqEpCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb )

inlineinherited

Register a callback for GET requests on an endpoint.

Parameters

cb	Callback function.

◆ setGetReqItfCallback()

void setGetReqItfCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb )

inlineinherited

Register a callback for GET requests on the interface.

Parameters

cb	Callback function.

◆ setIntDoneCallback()

void setIntDoneCallback ( std::function< void(USBAudioDeviceBase *, uint8_t)> cb )

inlineinherited

Register a callback for interrupt done events.

Parameters

cb	Callback function.

◆ setItfCloseEpCallback()

void setItfCloseEpCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb )

inlineinherited

Register a callback for interface close endpoint events.

Parameters

cb	Callback function.

◆ setMute()

bool setMute	(	bool	m,
		uint8_t	channel = `0`
	)

inlineinherited

Set the mute state for a channel and notify the host.

Parameters

m	true = muted, false = unmuted.
channel	0 = master, 1..N = per-channel.

Returns: true if the channel index was valid.

◆ setMuteCallback()

void setMuteCallback ( std::function< void(bool, uint8_t)> cb )

inlineinherited

Register a callback invoked when the host (or device) changes the mute state.

Parameters

cb	Callback receiving (bool muted, uint8_t channel).

◆ setNotifyActive()

void setNotifyActive ( bool flag )

inlineinherited

Deactivate/Reactivate automatic AudioInfo updates: (default is active)

◆ setReqEntityCallback() [1/2]

void setReqEntityCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t)> cb )

inlineinherited

Register a callback for entity requests.

Parameters

cb	Callback function.

◆ setReqEntityCallback() [2/2]

void setReqEntityCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &, uint8_t *)> cb )

inlineinherited

Register a callback for entity set requests.

Parameters

cb	Callback function.

◆ setReqEpCallback()

void setReqEpCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &, uint8_t *)> cb )

inlineinherited

Register a callback for endpoint set requests.

Parameters

cb	Callback function.

◆ setReqItfCallback()

void setReqItfCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &, uint8_t *)> cb )

inlineinherited

Register a callback for interface set requests.

Parameters

cb	Callback function.

◆ setRxDoneCallback()

void setRxDoneCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, audiod_function_t *, uint16_t)> cb )

inlineinherited

Register a callback for RX done events.

Parameters

cb	Callback function.

◆ setSampleRate()

void setSampleRate ( uint32_t rate )

inlineprotectedinherited

Device-initiated sample rate change.

Updates the internal config, fires the sample-rate callback, and notifies the host via the AC interrupt endpoint (Clock Source SAM_FREQ CUR). The host will typically re-issue SET_INTERFACE to restart streaming at the new rate.

Parameters

rate	New sample rate in Hz (should be one of the 14 rates advertised in the Clock Source GET_RANGE response).

◆ setSampleRateCallback()

void setSampleRateCallback ( std::function< void(uint32_t)> cb )

inlineinherited

Register a callback invoked when the host (or device) changes the sample rate.

Parameters

cb	Callback receiving the new rate in Hz.

◆ setStreamingStateCallback()

void setStreamingStateCallback ( std::function< void(bool, bool)> cb )

inlineinherited

Register a callback invoked when the streaming state changes. Fires when the host opens or closes a streaming interface (SET_INTERFACE alt=1 / alt=0).

Parameters

cb	Callback receiving (bool active_tx, bool active_rx).

◆ setTudAudioSetItfCallback()

void setTudAudioSetItfCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, UsbSetupPacket const &)> cb )

inlineinherited

Register a callback for interface set requests.

Parameters

cb	Callback function.

◆ setTxDoneCallback()

void setTxDoneCallback ( std::function< bool(USBAudioDeviceBase *, uint8_t, audiod_function_t *)> cb )

inlineinherited

Register a callback for TX done events.

Parameters

cb	Callback function.

◆ setupFeedback()

void setupFeedback	(	audiod_function_t *	audio,
		uint8_t	func_id,
		uint8_t	alt
	)

inlineprotectedinherited

◆ setVolume() [1/2]

bool setVolume	(	float	vol,
		uint8_t	channel
	)

inlineinherited

Set the volume for a channel and notify the host.

Parameters

vol	Volume as a float 0.0 (silence) to 1.0 (0 dB).
channel	0 = master, 1..N = per-channel.

Returns: true if the channel index was valid.

◆ setVolume() [2/2]

bool setVolume ( float volume )

inlineoverridevirtualinherited

sets the volume for the master channel (channel 0)

Reimplemented from VolumeSupport.

◆ setVolumeCallback()

void setVolumeCallback ( std::function< void(float, uint8_t)> cb )

inlineinherited

Register a callback invoked when the host (or device) changes the volume.

Parameters

cb	Callback receiving (float volume, uint8_t channel).

◆ setWriteBufferSize()

void setWriteBufferSize ( int size )

inlineinherited

◆ tud_audio_feedback_interval_isr()

void tud_audio_feedback_interval_isr	(	uint8_t	func_id,
		uint32_t	,
		uint8_t	frame_shift
	)

inlineprotectedinherited

◆ uac2ToFloat()

static float uac2ToFloat ( int16_t v )

inlinestaticprotectedinherited

Convert UAC2 int16 (1/256 dB) to linear volume (0.0–1.0). Linear mapping within the -100..0 dB range reported by GET_RANGE.

◆ volume() [1/2]

float volume ( )

inlineoverridevirtualinherited

gets the volume for the master channel (channel 0)

Reimplemented from VolumeSupport.

◆ volume() [2/2]

float volume ( uint8_t channel )

inlineinherited

Returns the current volume for the given channel.

Parameters

channel 0 = master, 1..N = per-channel.

Returns: Volume as a float in the range 0.0 (silence) to 1.0 (0 dB).

◆ write() [1/2]

size_t write	(	const uint8_t *	data,
		size_t	len
	)

inlinevirtualinherited

Send audio data to the host (device → host, microphone/capture). Silently discards data when the host has not opened the capture device (alt=0) so StreamCopy doesn't report write errors before recording.

Reimplemented from AudioStream.

◆ write() [2/2]

virtual size_t write ( uint8_t ch )

inlineoverridevirtualinherited

Reimplemented in MemoryStream, AudioStreamWrapper, BufferedTaskStream, RingBufferStream, BufferedStream, and URLStream.

◆ writeSilence()

virtual void writeSilence ( size_t len )

inlinevirtualinherited

Writes len bytes of silence (=0).

Friends And Related Symbol Documentation

◆ Emulated_TinyUSB

friend class Emulated_TinyUSB

bool is_started_ = false

protectedinherited

◆ kVolumeMinDb256

constexpr int16_t kVolumeMinDb256 = -25600

volatile uint32_t xfer_cb_tx_count_ = 0

protectedinherited

The documentation for this class was generated from the following file:

src/AudioTools/Communication/USB/USBAudioDeviceRenesas.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Static Protected Attributes

Friends

Detailed Description

Requires a core with the <tt>__USBGetCustomInterfaceDescriptor</tt> hook

Requires building with <tt>-DNO_USB</tt>

Constructor & Destructor Documentation

◆ USBAudioDeviceRenesas() [1/2]

◆ USBAudioDeviceRenesas() [2/2]

Member Function Documentation

◆ activateEndpoint()

◆ activeInstance()

◆ addNotifyAudioChange()

◆ audiod_calc_tx_packet_sz()

◆ audiod_control_complete()

◆ audiod_control_request()

◆ audiod_control_xfer_cb()

◆ audiod_deinit()

◆ audiod_fb_send()

◆ audiod_get_AS_interface_index()

◆ audiod_get_AS_interface_index_global()

◆ audiod_get_interface()

◆ audiod_init()

◆ audiod_open()

◆ audiod_parse_flow_control_params()

◆ audiod_reset()

◆ audiod_set_fb_params_freq()

◆ audiod_set_interface()

◆ audiod_sof_isr()

◆ audiod_tx_packet_size_fc()

◆ audiod_verify_entity_exists()

◆ audiod_verify_ep_exists()

◆ audiod_verify_itf_exists()

◆ audiod_xfer_cb()

◆ audioInfo()

◆ audioInfoOut()

◆ audioPacketSize()

◆ available()

◆ availableForWrite()

◆ backend()

◆ begin() [1/2]

◆ begin() [2/2]

◆ beginUSB()

◆ bufferRx()

◆ bufferTx()

◆ clearNotifyAudioChange()

◆ closeEpIn()

◆ closeEpOut()

◆ configChanged()

◆ customDescriptorCallback()

◆ defaultConfig()

◆ end()

◆ floatToUac2()

◆ flush()

◆ getActualInstance()

◆ getAudioCount()

◆ getCtrlBufSz()

◆ getDescLen()

◆ getDescriptor()

◆ getResetSize()

◆ getRxTotalBytes()

◆ getRxXferCount()

◆ getTxBytesPerSample()

◆ getTxChannels()

◆ getTxFifoReadTotal()

◆ getTxFrameBytesLast()

◆ getTxInterval()

◆ getTxSampleRate()

◆ getTxXferCount()

◆ getTxXferredLast()

◆ getVolumeExt()

◆ handleClockSourceGet()

◆ handleEndpointRequest()

◆ handleEntityRequest()

◆ handleFeatureUnitGet()

◆ handleInterfaceRequest()