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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"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_class_audio_frame_write PORTABLE C */
/* 6.2.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function writes frame to the Audio class. */
/* */
/* INPUT */
/* */
/* stream Address of audio stream */
/* instance */
/* frame Pointer to buffer to save */
/* frame data */
/* length Frame length in bytes */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_utility_memory_copy Copy data */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _ux_device_class_audio_frame_write(UX_DEVICE_CLASS_AUDIO_STREAM *stream, UCHAR *frame, ULONG length)
{
UX_SLAVE_ENDPOINT *endpoint;
UX_SLAVE_DEVICE *device;
UCHAR *next_frame_buffer;
ULONG frame_buffer_size;
/* Get the pointer to the device. */
device = &_ux_system_slave -> ux_system_slave_device;
/* As long as the device is in the CONFIGURED state. */
if (device -> ux_slave_device_state != UX_DEVICE_CONFIGURED)
{
/* Cannot proceed with command, the interface is down. */
return(UX_CONFIGURATION_HANDLE_UNKNOWN);
}
/* Check if endpoint is available. */
endpoint = stream -> ux_device_class_audio_stream_endpoint;
if (endpoint == UX_NULL)
return(UX_ERROR);
/* Check if endpoint direction is OK (IN). */
if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_OUT)
return(UX_ERROR);
/* Check frame length. */
frame_buffer_size = stream -> ux_device_class_audio_stream_frame_buffer_size;
if ((frame_buffer_size - 8) < length)
return(UX_ERROR);
/* Check overflow!! */
if (stream -> ux_device_class_audio_stream_access_pos == stream -> ux_device_class_audio_stream_transfer_pos &&
stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_length != 0)
return(UX_BUFFER_OVERFLOW);
/* Calculate next frame buffer. */
next_frame_buffer = (UCHAR *)stream -> ux_device_class_audio_stream_access_pos;
next_frame_buffer += frame_buffer_size;
if (next_frame_buffer >= stream -> ux_device_class_audio_stream_buffer + stream -> ux_device_class_audio_stream_buffer_size)
next_frame_buffer = stream -> ux_device_class_audio_stream_buffer;
/* Copy frame. */
_ux_utility_memory_copy(stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_data, frame, length); /* Use case of memcpy is verified. */
stream -> ux_device_class_audio_stream_access_pos -> ux_device_class_audio_frame_length = length;
/* Move frame position. */
stream -> ux_device_class_audio_stream_access_pos = (UX_DEVICE_CLASS_AUDIO_FRAME *)next_frame_buffer;
return(UX_SUCCESS);
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _uxe_device_class_audio_frame_write PORTABLE C */
/* 6.2.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks errors in writing frame function call. */
/* */
/* INPUT */
/* */
/* stream Address of audio stream */
/* instance */
/* frame Pointer to buffer to save */
/* frame data */
/* length Frame length in bytes */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_device_class_audio_frame_write Write frame to buffer to send */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/**************************************************************************/
UINT _uxe_device_class_audio_frame_write(UX_DEVICE_CLASS_AUDIO_STREAM *stream, UCHAR *frame, ULONG length)
{
/* Sanity checks. */
if (stream == UX_NULL || frame == UX_NULL || length == 0)
return(UX_INVALID_PARAMETER);
/* Write to frame. */
return(_ux_device_class_audio_frame_write(stream, frame, length));
}
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