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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) && defined(UX_DEVICE_STANDALONE)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_audio_feedback_task_function PORTABLE C */
/* 6.2.0 */
/* AUTHOR */
/* */
/* Yajun Xia, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is background task of ISO OUT/IN (feedback of IN/OUT) */
/* for the Audio class. */
/* */
/* It's for standalone mode. */
/* */
/* INPUT */
/* */
/* stream Pointer to audio stream */
/* */
/* OUTPUT */
/* */
/* State machine status */
/* UX_STATE_EXIT Device not configured */
/* UX_STATE_IDLE No feedback transfer running */
/* UX_STATE_WAIT Feedback transfer running */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler System error trap */
/* _ux_device_stack_transfer_run Run transfer state machine */
/* */
/* CALLED BY */
/* */
/* Audio Class (task) */
/* */
/**************************************************************************/
UINT _ux_device_class_audio_feedback_task_function(UX_DEVICE_CLASS_AUDIO_STREAM *stream)
{
UINT status;
UX_SLAVE_DEVICE *device;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_TRANSFER *transfer;
ULONG transfer_length;
/* Get stack device instance. */
device = stream -> ux_device_class_audio_stream_audio -> ux_device_class_audio_device;
/* Check if the device is configured. */
if (device -> ux_slave_device_state != UX_DEVICE_CONFIGURED)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CONFIGURATION_HANDLE_UNKNOWN);
stream -> ux_device_class_audio_stream_feedback_task_state = UX_STATE_EXIT;
return(UX_STATE_EXIT);
}
/* Get endpoint instance. */
endpoint = stream -> ux_device_class_audio_stream_feedback;
/* Endpoint not available, maybe it's alternate setting 0. */
if (endpoint == UX_NULL)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_ENDPOINT_HANDLE_UNKNOWN);
stream -> ux_device_class_audio_stream_feedback_task_state = UX_STATE_RESET;
return(UX_STATE_IDLE);
}
/* 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;
switch (stream -> ux_device_class_audio_stream_feedback_task_state)
{
case UX_STATE_RESET:
stream -> ux_device_class_audio_stream_feedback_task_state = UX_DEVICE_CLASS_AUDIO_STREAM_FEEDBACK_RW_WAIT;
stream -> ux_device_class_audio_stream_feedback_task_status = UX_TRANSFER_NO_ANSWER;
/* Fall through. */
case UX_DEVICE_CLASS_AUDIO_STREAM_FEEDBACK_RW_WAIT:
/* Issue transfer request. */
status = _ux_device_stack_transfer_run(transfer, transfer_length, transfer_length);
/* Any error or success case. */
if (status < UX_STATE_NEXT)
{
/* Error notification! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_ERROR);
stream -> ux_device_class_audio_stream_feedback_task_state = UX_STATE_RESET;
stream -> ux_device_class_audio_stream_feedback_task_status = transfer -> ux_slave_transfer_request_completion_code;
return(UX_STATE_EXIT);
}
/* Success case. */
if (status == UX_STATE_NEXT)
{
stream -> ux_device_class_audio_stream_feedback_task_state = UX_DEVICE_CLASS_AUDIO_STREAM_FEEDBACK_RW_WAIT;
stream -> ux_device_class_audio_stream_feedback_task_status = transfer -> ux_slave_transfer_request_completion_code;
}
/* Keep waiting. */
return(UX_STATE_WAIT);
default:
stream -> ux_device_class_audio_stream_feedback_task_state = UX_STATE_RESET;
stream -> ux_device_class_audio_stream_feedback_task_status = UX_INVALID_STATE;
break;
}
/* Error case. */
return(UX_STATE_EXIT);
}
#endif
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