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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)
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_audio_write_task_function PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Yajun Xia, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the background task of the audio stream write. */
/* */
/* It's for standalone mode. */
/* */
/* INPUT */
/* */
/* audio_class Address of audio class */
/* container */
/* */
/* OUTPUT */
/* */
/* State machine status */
/* UX_STATE_EXIT Device not configured */
/* UX_STATE_IDLE No streaming transfer running */
/* UX_STATE_WAIT Streaming transfer running */
/* */
/* CALLS */
/* */
/* _ux_device_stack_transfer_run Run transfer state machine */
/* _ux_utility_memory_copy Copy memory */
/* */
/* CALLED BY */
/* */
/* USBX Device Stack */
/* */
/**************************************************************************/
UINT _ux_device_class_audio_write_task_function(UX_DEVICE_CLASS_AUDIO_STREAM *stream)
{
UX_SLAVE_DEVICE *device;
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_TRANSFER *transfer;
UCHAR *next_pos;
UX_DEVICE_CLASS_AUDIO_FRAME *next_frame;
ULONG transfer_length;
ULONG actual_length;
UINT status;
/* Get the pointer to the device. */
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)
{
stream -> ux_device_class_audio_stream_task_state = UX_STATE_EXIT;
return(UX_STATE_EXIT);
}
/* Get the endpoint. */
endpoint = stream -> ux_device_class_audio_stream_endpoint;
/* No endpoint ready, maybe it's alternate setting 0. */
if (endpoint == UX_NULL)
return(UX_STATE_IDLE);
/* Check if background transfer task is started. */
if (stream -> ux_device_class_audio_stream_task_state == UX_DEVICE_CLASS_AUDIO_STREAM_RW_STOP)
return(UX_STATE_IDLE);
/* Get transfer instance. */
transfer = &endpoint -> ux_slave_endpoint_transfer_request;
/* If not started yet, prepare data, reset transfer and start polling. */
if (stream -> ux_device_class_audio_stream_task_state == UX_DEVICE_CLASS_AUDIO_STREAM_RW_START)
{
/* Next state: transfer wait. */
stream -> ux_device_class_audio_stream_task_state = UX_DEVICE_CLASS_AUDIO_STREAM_RW_WAIT;
/* Start frame transfer anyway (even ZLP). */
transfer_length = stream -> ux_device_class_audio_stream_transfer_pos -> ux_device_class_audio_frame_length;
#if UX_DEVICE_ENDPOINT_BUFFER_OWNER == 0
/* Stack owns buffer, copy data to it. */
if (transfer_length)
_ux_utility_memory_copy(transfer -> ux_slave_transfer_request_data_pointer,
stream -> ux_device_class_audio_stream_transfer_pos -> ux_device_class_audio_frame_data, transfer_length); /* Use case of memcpy is verified. */
#else
/* Zero copy: directly use frame buffer to transfer. */
transfer -> ux_slave_transfer_request_data_pointer = stream ->
ux_device_class_audio_stream_transfer_pos -> ux_device_class_audio_frame_data;
#endif
/* Reset transfer state. */
UX_SLAVE_TRANSFER_STATE_RESET(transfer);
}
/* Get current transfer length. */
transfer_length = stream -> ux_device_class_audio_stream_transfer_pos -> ux_device_class_audio_frame_length;
/* Run transfer states. */
status = _ux_device_stack_transfer_run(transfer, transfer_length, transfer_length);
/* Error case. */
if (status < UX_STATE_NEXT)
{
/* Error on background transfer task start. */
stream -> ux_device_class_audio_stream_task_state = UX_STATE_RESET;
stream -> ux_device_class_audio_stream_task_status =
transfer -> ux_slave_transfer_request_completion_code;
/* Error notification! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_ERROR);
return(UX_STATE_EXIT);
}
/* Success case. */
if (status == UX_STATE_NEXT)
{
/* Next state: start. */
stream -> ux_device_class_audio_stream_task_state = UX_DEVICE_CLASS_AUDIO_STREAM_RW_START;
stream -> ux_device_class_audio_stream_task_status =
transfer -> ux_slave_transfer_request_completion_code;
/* Frame sent, free it. */
stream -> ux_device_class_audio_stream_transfer_pos -> ux_device_class_audio_frame_length = 0;
/* Get actual transfer length. */
actual_length = transfer -> ux_slave_transfer_request_actual_length;
/* Calculate next position. */
next_pos = (UCHAR *)stream -> ux_device_class_audio_stream_transfer_pos;
next_pos += stream -> ux_device_class_audio_stream_frame_buffer_size;
if (next_pos >= stream -> ux_device_class_audio_stream_buffer + stream -> ux_device_class_audio_stream_buffer_size)
next_pos = stream -> ux_device_class_audio_stream_buffer;
next_frame = (UX_DEVICE_CLASS_AUDIO_FRAME *)next_pos;
/* Underflow check! */
if (transfer_length)
{
/* Advance position. */
stream -> ux_device_class_audio_stream_transfer_pos = next_frame;
/* Error trap! */
if (next_frame -> ux_device_class_audio_frame_length == 0)
{
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_BUFFER_OVERFLOW);
stream -> ux_device_class_audio_stream_buffer_error_count ++;
}
}
else
{
/* Advance position if next payload available. */
if (next_frame -> ux_device_class_audio_frame_length)
stream -> ux_device_class_audio_stream_transfer_pos = next_frame;
else
{
/* Error trap! */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_BUFFER_OVERFLOW);
stream -> ux_device_class_audio_stream_buffer_error_count ++;
}
}
/* Invoke notification callback. */
if (stream -> ux_device_class_audio_stream_callbacks.ux_device_class_audio_stream_frame_done != UX_NULL)
stream -> ux_device_class_audio_stream_callbacks.ux_device_class_audio_stream_frame_done(stream, actual_length);
}
/* Keep waiting. */
return(UX_STATE_WAIT);
}
#endif
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