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Signed-off-by: HiFiPHile <[email protected]>
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Signed-off-by: HiFiPHile <[email protected]>
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Report asynchronous start and stop completion with transfer results. Replace the ambiguous stream error callback and byte count with explicit transfer-failure events, and ignore stale completions after stopping.
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Describe configuration limits by their actual storage scope, document asynchronous stream startup and shutdown, clarify that FIFO APIs are always non-blocking, and correct playback callback ordering.
Signed-off-by: HiFiPHile <[email protected]>
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Remove the narrow public Feature Unit request API while retaining managed mute and volume helpers. Expose validated Audio Control descriptors during enumeration and provide raw asynchronous and synchronous entity requests for advanced controls.
Signed-off-by: HiFiPHile <[email protected]>
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Accept the defined silence value and round ordinary volume requests to the nearest supported resolution step within the cached range. Add tests for silence, clamping, and step alignment.
Signed-off-by: HiFiPHile <[email protected]>
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Add protocol-selectable UAC1/UAC2 parsing, UAC2 terminal and Feature Unit topology, Clock Source discovery, sampling-frequency ranges, and protocol-specific stream controls. Cover UAC2 playback, capture, control discovery, and malformed descriptors with unit tests.
Signed-off-by: HiFiPHile <[email protected]>
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Store each Audio Streaming alternate setting once and flatten its sample rates only at the public API boundary. Keep feedback and pacing state playback-only, eliminating duplicate configuration fields from capture streams.
Signed-off-by: HiFiPHile <[email protected]>
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Inspect each associated Feature Unit during mount, cache master mute support and the common MIN, MAX, and RES volume range, and ignore units with neither control. Add typed asynchronous and synchronous mute and volume APIs and demonstrate them in the host example.
Signed-off-by: HiFiPHile <[email protected]>
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Route asynchronous activation and sampling-frequency failures through the stream error callback. Keep a running stream active when SET_INTERFACE alt 0 cannot be submitted so stop can be retried without diverging from device state.
Signed-off-by: HiFiPHile <[email protected]>
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Make configuration a synchronous local operation that selects and opens the endpoint. Start now activates the alternate setting and sets the sampling frequency afterward, including every restart, so devices cannot reset the selected rate with SET_INTERFACE.
Signed-off-by: HiFiPHile <[email protected]>
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Keep capture and playback transfers continuously armed from their completion callbacks. Capture overwrites the oldest complete frames when full, while playback sends silence on underrun without consuming partial queued audio.
Signed-off-by: HiFiPHile <[email protected]>
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Collect only format descriptors with discrete sampling frequencies. The configuration API exposes concrete tuples and cannot safely represent a continuous range as one selectable rate.
Signed-off-by: HiFiPHile <[email protected]>
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Convert full-speed bInterval values to the scheduler microframe timebase and size transfers for the complete service interval. Endpoints with bInterval greater than one no longer run at a one-frame cadence.
Signed-off-by: HiFiPHile <[email protected]>
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Associate one directly connected Feature Unit with each capture and playback stream. This lets applications control microphone and speaker paths independently.
Signed-off-by: HiFiPHile <[email protected]>
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Keep Feature Unit request data in driver-owned storage until asynchronous completion and use the width defined for each control. This avoids overlapping request state and malformed one-byte controls.
Signed-off-by: HiFiPHile <[email protected]>
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Provide a high-level audio streaming API over UAC 1.0 devices while
keeping the USB topology private: applications select supported
{format, sample_rate, channels} configurations per logical stream, and
the driver owns the mapping to AS interface, alternate setting, and
endpoint.
- One logical stream per direction per instance; multiple AS interfaces
and alternate settings in a direction are merged into the stream's
configuration list (discrete tuples; continuous ranges exposed as a
single configuration at the top rate)
- Asynchronous tuh_audio_configure(): SET_INTERFACE to the selected
alternate setting, open/reconfigure the endpoint, set the sampling
frequency when supported, initialize the FIFO and packet scheduler,
then invoke the completion callback
- Frame-based FIFO streaming: tuh_audio_read()/tuh_audio_write() queue
whole frames; the driver owns transfer replenishment and fractional
packet scheduling (44.1 kHz pays back the 0.1 frame/ms remainder via
an accumulator for exact average pacing)
- tuh_audio_start()/tuh_audio_stop() activate/deactivate the stream
interface through SET_INTERFACE (alt n / alt 0)
Driver correctness fixes:
- Parse only the AC header's interface collection; MIDI Streaming and
other subclasses are skipped
- Keep every discrete format as a separate configuration; endpoints are
opened only for the alternate setting selected by tuh_audio_configure()
- Check tuh_interface_set() return values and SET_INTERFACE transfer
results instead of ignoring failures
- Validate instance state, direction, buffers, and frame counts in every
transfer API
- Feature Unit requests use the control's real width (mute/AGC/loudness
1 byte, others 2 bytes) and convert multibyte values to host order
- Failed/stalled/aborted isochronous transfers reach only the error
callback, never the capture/playback callbacks
The audio_host example uses the new API: 48 kHz stereo by default,
automatic stream restart on error callbacks, a sine test tone on the
playback stream, and periodic mic-only / spk-only / echo phase switching.
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This commit refactors the TUH_AUDIO (USB Audio Host) class driver to
simplify its public API and improve multi-AS (Audio Streaming) interface
support. The changes are focused on three files: the core driver
(audio_host.c/h) and the example application (audio_app.c).
Key changes in src/class/audio/audio_host.h:
- Remove tuh_audio_descriptor_cb_t and tuh_audio_mount_cb_t structures.
The mount callback no longer passes a large descriptor-info struct;
applications query per-AS info via tuh_audio_as_get_info().
- Add tuh_audio_get_dev_addr() and tuh_audio_get_feature_unit_id()
accessors to retrieve device address and feature-unit ID from an
interface index.
- Simplify control-transfer APIs by replacing (daddr, itf_num, unit_id)
parameters with a single idx parameter:
tuh_audio_set_sampling_freq(idx, as_idx, ...)
tuh_audio_get_sampling_freq(idx, as_idx, ...)
tuh_audio_feature_unit_set(idx, control_selector, channel, ...)
tuh_audio_feature_unit_get(idx, control_selector, channel, ...)
- Add synchronous wrapper APIs using TU_API_SYNC macro:
tuh_audio_get_sampling_freq_sync()
tuh_audio_set_sampling_freq_sync()
tuh_audio_feature_unit_set_sync()
tuh_audio_feature_unit_get_sync()
- Update isochronous endpoint APIs to use (idx, as_idx) instead of
(daddr, idx):
tuh_audio_receive(idx, as_idx, buffer, len)
tuh_audio_send(idx, as_idx, buffer, len)
- Remove tuh_audio_descriptor_cb() weak callback.
- Update tuh_audio_mount_cb() signature from mount_cb(param) to no param.
- Update tuh_audio_rx_cb()/tuh_audio_tx_cb() first parameter from idx to
dev_addr for consistency with other class drivers.
Key changes in src/class/audio/audio_host.c:
- Delete tuh_audio_descriptor_cb weak stub.
- Refactor get_idx_by_ep_addr() to iterate all AS interfaces per device
instead of relying on single ep_in/ep_out fields.
- Add audioh_get_ep_addr_by_dir() helper to find an endpoint address by
direction across multiple AS interfaces.
- Simplify audioh_close() cleanup: remove now-removed single-endpoint
fields (ep_in, ep_out) and rely on tu_memclr(p_audio->as, ...).
- Update audioh_xfer_cb() to pass dev_addr (not idx) to rx/tx callbacks,
matching the new callback signature.
- Simplify audioh_open(): remove descriptor-callback emission and the
temporary desc_cb structure; store only ac_itf_num instead of
bInterfaceNumber + iInterface + as_interface_num.
- Rename local descriptor pointers for clarity:
desc_input_terminal (was desc_it)
desc_output_terminal (was desc_ot)
Key changes in examples/host/audio_host/src/audio_app.c:
- Remove now-unnecessary globals: audio_ep_in, audio_ep_out, audio_ac_itf,
audio_feature_unit_id.
- Initialize audio_dev_addr, audio_idx, audiostream_in_idx,
audiostream_out_idx to 0xFF (TUSB_INDEX_INVALID_8) instead of 0.
- Update print_as_interfaces() to use tuh_audio_as_get_count() and
tuh_audio_as_get_info() instead of accessing mount_cb_data.
- Update all callback signatures and API calls to match the new driver API.
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const style
Rename descriptor pointer variables to use desc_ prefix for consistency with audio_device.c:
- it -> desc_input_terminal
- ot -> desc_output_terminal
- fu -> desc_feature_unit
- itf -> desc_interface
- p_ep -> desc_endpoint
Unify const qualifier placement to type_t const * style.
Add file header comment describing UAC 1.0 host driver capabilities.
Switch license header to SPDX identifier.
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Add TinyUSB Host Audio class driver supporting UAC 1.0 devices.
Features:
- Support multiple Audio Streaming (AS) interfaces with independent format storage
- Support both IN (Microphone) and OUT (Speaker) endpoints
- Per-AS interface format info: channels, sample rate, bit resolution
- Support Feature Unit volume control
- Support sampling frequency get/set
- Add host/audio_host example for STM32F407 discovery board
- Support mono-to-stereo conversion for loopback
Changes:
- Add src/class/audio/audio_host.c and audio_host.h
- Register AUDIO driver in usbh.c
- Add CFG_TUH_AUDIO macro in tusb_option.h
- Add host/audio_host example with CMake and Makefile build support
Tested with Jabra USB headset (stereo speaker + mono microphone) on STM32F407 disco.
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