1 /***************************************************************************
2 * Copyright (c) 2024 Microsoft Corporation
3 *
4 * This program and the accompanying materials are made available under the
5 * terms of the MIT License which is available at
6 * https://opensource.org/licenses/MIT.
7 *
8 * SPDX-License-Identifier: MIT
9 **************************************************************************/
10
11 /**************************************************************************/
12 /**************************************************************************/
13 /** */
14 /** USBX Component */
15 /** */
16 /** Device Audio Class */
17 /** */
18 /**************************************************************************/
19 /**************************************************************************/
20
21 #define UX_SOURCE_CODE
22
23
24 /* Include necessary system files. */
25
26 #include "ux_api.h"
27 #include "ux_device_class_audio.h"
28 #include "ux_device_stack.h"
29
30
31 #if defined(UX_DEVICE_CLASS_AUDIO_FEEDBACK_SUPPORT)
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _ux_device_class_audio_feedback_thread_entry PORTABLE C */
37 /* 6.2.0 */
38 /* AUTHOR */
39 /* */
40 /* Chaoqiong Xiao, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This function is thread of ISO OUT/IN (feedback of IN/OUT) */
45 /* for the Audio class. */
46 /* */
47 /* INPUT */
48 /* */
49 /* audio_stream Address of audio stream */
50 /* instance */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* None */
55 /* */
56 /* CALLS */
57 /* */
58 /* _ux_system_error_handler System error trap */
59 /* _ux_utility_thread_suspend Suspend thread used */
60 /* _ux_device_stack_transfer_request Issue transfer request */
61 /* _ux_utility_memory_copy Copy data */
62 /* */
63 /* CALLED BY */
64 /* */
65 /* ThreadX */
66 /* */
67 /* RELEASE HISTORY */
68 /* */
69 /* DATE NAME DESCRIPTION */
70 /* */
71 /* 01-31-2022 Chaoqiong Xiao Initial Version 6.1.10 */
72 /* 10-31-2022 Yajun Xia Modified comment(s), */
73 /* added standalone support, */
74 /* resulting in version 6.2.0 */
75 /* */
76 /**************************************************************************/
_ux_device_class_audio_feedback_thread_entry(ULONG audio_stream)77 VOID _ux_device_class_audio_feedback_thread_entry(ULONG audio_stream)
78 {
79 #if defined(UX_DEVICE_STANDALONE)
80 UX_PARAMETER_NOT_USED(audio_stream);
81 return;
82 #else
83 UINT status;
84 UX_DEVICE_CLASS_AUDIO_STREAM *stream;
85 UX_SLAVE_DEVICE *device;
86 UX_SLAVE_ENDPOINT *endpoint;
87 UX_SLAVE_TRANSFER *transfer;
88 ULONG transfer_length;
89
90
91 /* Get Audio class stream instance. */
92 UX_THREAD_EXTENSION_PTR_GET(stream, UX_DEVICE_CLASS_AUDIO_STREAM, audio_stream)
93
94 /* Get stack device instance. */
95 device = stream -> ux_device_class_audio_stream_audio -> ux_device_class_audio_device;
96
97 /* This thread runs forever but can be suspended or resumed. */
98 while (1)
99 {
100 while (device -> ux_slave_device_state == UX_DEVICE_CONFIGURED)
101 {
102
103 /* Get endpoint instance. */
104 endpoint = stream -> ux_device_class_audio_stream_feedback;
105
106 /* Endpoint not available, maybe it's alternate setting 0. */
107 if (endpoint == UX_NULL)
108 break;
109
110 /* Get transfer instance. */
111 transfer = &endpoint -> ux_slave_endpoint_transfer_request;
112
113 /* Length is pre-set on interface alternate setting activate. */
114 transfer_length = transfer -> ux_slave_transfer_request_requested_length;
115
116 /* Issue transfer request, thread blocked until transfer done. */
117 status = _ux_device_stack_transfer_request(transfer, transfer_length, transfer_length);
118
119 /* Check error. */
120 if (status == UX_TRANSFER_BUS_RESET)
121 continue;
122 if (status != UX_SUCCESS)
123 {
124
125 /* Error notification! */
126 _ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_ERROR);
127 break;
128 }
129
130 /* Transfer done, keep data in transfer buffer. */
131 }
132
133 /* We need to suspend ourselves. We will be resumed by the device enumeration module or when a change of alternate setting happens. */
134 _ux_utility_thread_suspend(&stream -> ux_device_class_audio_stream_feedback_thread);
135 }
136 #endif
137 }
138 #endif
139
