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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Device Audio Class */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_class_audio.h"
#include "ux_device_stack.h"
#if defined(UX_DEVICE_CLASS_AUDIO_FEEDBACK_SUPPORT)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_audio_feedback_thread_entry PORTABLE C */
/* 6.2.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is thread of ISO OUT/IN (feedback of IN/OUT) */
/* for the Audio class. */
/* */
/* INPUT */
/* */
/* audio_stream Address of audio stream */
/* instance */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler System error trap */
/* _ux_utility_thread_suspend Suspend thread used */
/* _ux_device_stack_transfer_request Issue transfer request */
/* _ux_utility_memory_copy Copy data */
/* */
/* CALLED BY */
/* */
/* ThreadX */
/* */
/**************************************************************************/
VOID _ux_device_class_audio_feedback_thread_entry(ULONG audio_stream)
{
#if defined(UX_DEVICE_STANDALONE)
UX_PARAMETER_NOT_USED(audio_stream);
return;
#else
UINT status;
UX_DEVICE_CLASS_AUDIO_STREAM *stream;
UX_SLAVE_DEVICE *device;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_TRANSFER *transfer;
ULONG transfer_length;
/* Get Audio class stream instance. */
UX_THREAD_EXTENSION_PTR_GET(stream, UX_DEVICE_CLASS_AUDIO_STREAM, audio_stream)
/* Get stack device instance. */
device = stream -> ux_device_class_audio_stream_audio -> ux_device_class_audio_device;
/* This thread runs forever but can be suspended or resumed. */
while (1)
{
while (device -> ux_slave_device_state == UX_DEVICE_CONFIGURED)
{
/* Get endpoint instance. */
endpoint = stream -> ux_device_class_audio_stream_feedback;
/* Endpoint not available, maybe it's alternate setting 0. */
if (endpoint == UX_NULL)
break;
/* Get transfer instance. */
transfer = &endpoint -> ux_slave_endpoint_transfer_request;
/* Length is pre-set on interface alternate setting activate. */
transfer_length = transfer -> ux_slave_transfer_request_requested_length;
/* Issue transfer request, thread blocked until transfer done. */
status = _ux_device_stack_transfer_request(transfer, transfer_length, transfer_length);
/* Check error. */
if (status == UX_TRANSFER_BUS_RESET)
continue;
if (status != UX_SUCCESS)
{
/* Error notification! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_ERROR);
break;
}
/* Transfer done, keep data in transfer buffer. */
}
/* We need to suspend ourselves. We will be resumed by the device enumeration module or when a change of alternate setting happens. */
_ux_utility_thread_suspend(&stream -> ux_device_class_audio_stream_feedback_thread);
}
#endif
}
#endif
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