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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 */
/** */
/** Audio Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_audio.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_audio_transfer_request PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function submits an isochronous audio transfer request to the */
/* USBX stack. */
/* */
/* INPUT */
/* */
/* audio Pointer to audio class */
/* audio_transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* */
/* CALLED BY */
/* */
/* Audio Class */
/* */
/**************************************************************************/
UINT _ux_host_class_audio_transfer_request(UX_HOST_CLASS_AUDIO *audio,
UX_HOST_CLASS_AUDIO_TRANSFER_REQUEST *audio_transfer_request)
{
UX_INTERRUPT_SAVE_AREA
UINT status;
UX_TRANSFER *transfer_request;
/* The transfer request is embedded in the application transfer request. */
transfer_request = &audio_transfer_request -> ux_host_class_audio_transfer_request;
/* Saved the direction, by taking the endpoint transfer direction. */
transfer_request -> ux_transfer_request_type =
audio -> ux_host_class_audio_isochronous_endpoint ->
ux_endpoint_transfer_request.ux_transfer_request_type;
/* Fill the transfer request with all the required fields. */
transfer_request -> ux_transfer_request_endpoint = audio -> ux_host_class_audio_isochronous_endpoint;
transfer_request -> ux_transfer_request_data_pointer = audio_transfer_request -> ux_host_class_audio_transfer_request_data_pointer;
transfer_request -> ux_transfer_request_requested_length = audio_transfer_request -> ux_host_class_audio_transfer_request_requested_length;
transfer_request -> ux_transfer_request_packet_length = audio_transfer_request -> ux_host_class_audio_transfer_request_packet_size;
transfer_request -> ux_transfer_request_completion_function = _ux_host_class_audio_transfer_request_completed;
transfer_request -> ux_transfer_request_class_instance = audio;
transfer_request -> ux_transfer_request_next_transfer_request = UX_NULL; /* Add one by one. */
/* We memorize the application transfer request in the local transfer request. */
transfer_request -> ux_transfer_request_user_specific = (VOID *) audio_transfer_request;
UX_DISABLE
/* Hook the audio transfer request to the chain of transfer requests in the audio instance. */
audio_transfer_request -> ux_host_class_audio_transfer_request_next_audio_transfer_request =
audio -> ux_host_class_audio_tail_transfer_request;
audio -> ux_host_class_audio_tail_transfer_request = audio_transfer_request;
/* Check if this is the first time we have had a transfer request, if so update the head as well. */
if (audio -> ux_host_class_audio_head_transfer_request == UX_NULL)
audio -> ux_host_class_audio_head_transfer_request = audio_transfer_request;
UX_RESTORE
/* Transfer the transfer request (queued in lower level). */
status = _ux_host_stack_transfer_request(transfer_request);
/* Return completion status. */
return(status);
}
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