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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_STANDALONE) && defined(UX_DEVICE_CLASS_AUDIO_INTERRUPT_SUPPORT)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_audio_interrupt_thread_entry PORTABLE C */
/* 6.1.12 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is thread of INTERRUPT IN from the Audio class. */
/* */
/* It's for RTOS mode. */
/* */
/* INPUT */
/* */
/* audio Address of audio instance */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_system_error_handler System error trap */
/* _ux_device_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_interrupt_thread_entry(ULONG audio_inst)
{
UINT status;
UX_DEVICE_CLASS_AUDIO *audio;
UX_SLAVE_DEVICE *device;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_TRANSFER *transfer;
ULONG size;
UCHAR *buff;
/* Get Audio class instance. */
UX_THREAD_EXTENSION_PTR_GET(audio, UX_DEVICE_CLASS_AUDIO, audio_inst)
/* Get stack device instance. */
device = 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 = audio -> ux_device_class_audio_interrupt;
/* Endpoint not available, maybe it's alternate setting 0. */
if (endpoint == UX_NULL)
break;
/* Get transfer instance. */
transfer = &endpoint -> ux_slave_endpoint_transfer_request;
/* Get semaphore before start transfer. */
status = _ux_device_semaphore_get(&audio -> ux_device_class_audio_status_semaphore, UX_WAIT_FOREVER);
if (status != UX_SUCCESS)
{
/* Error notification! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_SEMAPHORE_ERROR);
break;
}
/* Get interrupt data size. */
size = audio -> ux_device_class_audio_status_size;
UX_ASSERT(size <= transfer -> ux_slave_transfer_request_transfer_length);
/* Copy data in tail. */
buff = audio -> ux_device_class_audio_status_tail;
_ux_utility_memory_copy(transfer -> ux_slave_transfer_request_data_pointer,
buff, size); /* Use case of memcpy is verified. */
/* Start frame transfer anyway. */
status = _ux_device_stack_transfer_request(transfer, size, size);
/* Check transfer status. */
if (status != UX_SUCCESS)
{
/* Error notification! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_ERROR);
break;
}
/* Calculate next tail. */
buff += size;
if (buff >= (audio -> ux_device_class_audio_status_queue + audio -> ux_device_class_audio_status_queue_bytes))
buff = audio -> ux_device_class_audio_status_queue;
/* Update queue status. */
_ux_device_mutex_on(&audio -> ux_device_class_audio_status_mutex);
audio -> ux_device_class_audio_status_tail = buff;
audio -> ux_device_class_audio_status_queued -= size;
_ux_device_mutex_off(&audio -> ux_device_class_audio_status_mutex);
} /* while (device -> ux_slave_device_state == UX_DEVICE_CONFIGURED) */
/* We need to suspend ourselves. We will be resumed by the device enumeration module or when a change of alternate setting happens. */
_ux_device_thread_suspend(&audio -> ux_device_class_audio_class -> ux_slave_class_thread);
}
}
#endif
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