Outline ![]()
Files ![]()
loading...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** CDC ACM Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_cdc_acm.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_cdc_acm_write PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function writes to the cdc_acm interface. The call is blocking */
/* and only returns when there is either an error or when the transfer */
/* is complete. */
/* */
/* INPUT */
/* */
/* cdc_acm Pointer to cdc_acm class */
/* data_pointer Pointer to data to write */
/* requested_length Length of data to write */
/* actual_length Actual length of data written */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_transfer_request Process transfer request */
/* _ux_host_stack_transfer_request_abort Abort transfer request */
/* _ux_host_semaphore_get Get protection semaphore */
/* */
/* CALLED BY */
/* */
/* Application */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* 12-31-2020 Chaoqiong Xiao Modified comment(s), */
/* fixed ZLP sending, */
/* resulting in version 6.1.3 */
/* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
/* added standalone support, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _ux_host_class_cdc_acm_write(UX_HOST_CLASS_CDC_ACM *cdc_acm, UCHAR *data_pointer,
ULONG requested_length, ULONG *actual_length)
{
UX_TRANSFER *transfer_request;
UINT status;
ULONG transfer_request_length;
#if defined(UX_HOST_STANDALONE)
ULONG transfer_flags;
#endif
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_CDC_ACM_WRITE, cdc_acm, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* Ensure the instance is valid. */
if (cdc_acm -> ux_host_class_cdc_acm_state != UX_HOST_CLASS_INSTANCE_LIVE)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
/* As further protection, we must ensure this instance of the interface is the data interface and not
the control interface ! */
if (cdc_acm -> ux_host_class_cdc_acm_interface -> ux_interface_descriptor.bInterfaceClass != UX_HOST_CLASS_CDC_DATA_CLASS)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_HOST_CLASS_INSTANCE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_HOST_CLASS_INSTANCE_UNKNOWN, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_HOST_CLASS_INSTANCE_UNKNOWN);
}
#if defined(UX_HOST_STANDALONE)
if (cdc_acm -> ux_host_class_cdc_acm_write_state == UX_STATE_WAIT)
return(UX_BUSY);
cdc_acm -> ux_host_class_cdc_acm_write_state = UX_STATE_WAIT;
#endif
/* Start by resetting the actual length of the transfer. */
*actual_length = 0;
/* Get the pointer to the bulk out endpoint transfer request. */
transfer_request = &cdc_acm -> ux_host_class_cdc_acm_bulk_out_endpoint -> ux_endpoint_transfer_request;
#if defined(UX_HOST_STANDALONE)
/* Enable auto wait. */
transfer_flags = transfer_request -> ux_transfer_request_flags;
transfer_request -> ux_transfer_request_flags |= UX_TRANSFER_FLAG_AUTO_WAIT;
#endif
/* Perform a transfer on the bulk out endpoint until either the transfer is
completed or when there is an error. */
do
{
/* Program the maximum authorized length for this transfer_request. */
if (requested_length > transfer_request -> ux_transfer_request_maximum_length)
transfer_request_length = transfer_request -> ux_transfer_request_maximum_length;
else
transfer_request_length = requested_length;
/* Initialize the transfer_request. */
transfer_request -> ux_transfer_request_data_pointer = data_pointer;
transfer_request -> ux_transfer_request_requested_length = transfer_request_length;
/* Perform the transfer. */
status = _ux_host_stack_transfer_request(transfer_request);
/* If the transfer is successful, we need to wait for the transfer request to be completed. */
if (status == UX_SUCCESS)
{
#if !defined(UX_HOST_STANDALONE)
/* Wait for the completion of the transfer request. */
status = _ux_host_semaphore_get(&transfer_request -> ux_transfer_request_semaphore,
transfer_request -> ux_transfer_request_timeout_value);
/* If the semaphore did not succeed we probably have a time out. */
if (status != UX_SUCCESS)
{
/* All transfers pending need to abort. There may have been a partial transfer. */
_ux_host_stack_transfer_request_abort(transfer_request);
/* Update the length of the actual data transferred. We do this after the
abort of the transfer_request in case some data actually went out. */
*actual_length += transfer_request -> ux_transfer_request_actual_length;
/* Set the completion code. */
transfer_request -> ux_transfer_request_completion_code = UX_TRANSFER_TIMEOUT;
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_TRANSFER_TIMEOUT);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_TRANSFER_TIMEOUT, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* There was an error, return to the caller. */
return(UX_TRANSFER_TIMEOUT);
}
#endif
}
else
{
#if defined(UX_HOST_STANDALONE)
/* Update the length of the actual data transferred. We do this after the
abort of the transfer request in case some data was actually received. */
*actual_length += transfer_request -> ux_transfer_request_actual_length;
/* Restore previous setting. */
transfer_request -> ux_transfer_request_flags = transfer_flags;
/* Not busy any more. */
cdc_acm -> ux_host_class_cdc_acm_write_state = UX_STATE_RESET;
#endif
/* There was a non transfer error, no partial transfer to be checked */
return(status);
}
/* Update the length of the transfer. Normally all the data has to be sent. */
*actual_length += transfer_request -> ux_transfer_request_actual_length;
/* Check for completion of transfer. If the transfer is partial, return to caller.
The transfer is marked as successful but the caller will need to check the length
actually sent and determine if a partial transfer is OK. */
if (transfer_request_length != transfer_request -> ux_transfer_request_actual_length)
{
/* Return success. */
return(UX_SUCCESS);
}
/* Update the data pointer for next transfer. */
data_pointer += transfer_request_length;
/* Update what is left to send out. */
requested_length -= transfer_request_length;
} while (requested_length);
#if defined(UX_HOST_STANDALONE)
/* Restore previous setting. */
transfer_request -> ux_transfer_request_flags = transfer_flags;
/* Not busy any more. */
cdc_acm -> ux_host_class_cdc_acm_write_state = UX_STATE_RESET;
#endif
/* We get here when all the transfers went through without errors. */
return(UX_SUCCESS);
}