1 /**************************************************************************/
2 /* */
3 /* Copyright (c) Microsoft Corporation. All rights reserved. */
4 /* */
5 /* This software is licensed under the Microsoft Software License */
6 /* Terms for Microsoft Azure RTOS. Full text of the license can be */
7 /* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
8 /* and in the root directory of this software. */
9 /* */
10 /**************************************************************************/
11
12
13 /**************************************************************************/
14 /**************************************************************************/
15 /** */
16 /** USBX Component */
17 /** */
18 /** Host Sierra Wireless AR module class */
19 /** */
20 /**************************************************************************/
21 /**************************************************************************/
22
23
24 /* Include necessary system files. */
25
26 #define UX_SOURCE_CODE
27
28 #include "ux_api.h"
29 #include "ux_host_class_swar.h"
30 #include "ux_host_stack.h"
31
32
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _ux_host_class_swar_reception_callback PORTABLE C */
38 /* 6.1 */
39 /* AUTHOR */
40 /* */
41 /* Chaoqiong Xiao, Microsoft Corporation */
42 /* */
43 /* DESCRIPTION */
44 /* */
45 /* This function is the callback from the USBX transfer functions, */
46 /* it is called when a full or partial transfer has been done for a */
47 /* bulk in transfer. It calls back the application. */
48 /* */
49 /* INPUT */
50 /* */
51 /* transfer_request Pointer to transfer request */
52 /* */
53 /* OUTPUT */
54 /* */
55 /* None */
56 /* */
57 /* CALLS */
58 /* */
59 /* _ux_host_stack_transfer_request Process transfer request */
60 /* */
61 /* CALLED BY */
62 /* */
63 /* Application */
64 /* */
65 /* RELEASE HISTORY */
66 /* */
67 /* DATE NAME DESCRIPTION */
68 /* */
69 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
70 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
71 /* resulting in version 6.1 */
72 /* */
73 /**************************************************************************/
_ux_host_class_swar_reception_callback(UX_TRANSFER * transfer_request)74 VOID _ux_host_class_swar_reception_callback (UX_TRANSFER *transfer_request)
75 {
76
77 UX_HOST_CLASS_SWAR *swar;
78 UX_HOST_CLASS_SWAR_RECEPTION *swar_reception;
79
80 /* Get the class instance for this transfer request. */
81 swar = (UX_HOST_CLASS_SWAR *) transfer_request -> ux_transfer_request_class_instance;
82
83 /* Get the pointer to the acm reception structure. */
84 swar_reception = swar -> ux_host_class_swar_reception;
85
86 /* Check the state of the transfer. If there is an error, we do not proceed with this report. */
87 if (transfer_request -> ux_transfer_request_completion_code != UX_SUCCESS)
88 {
89
90 /* The reception is stopped. */
91 swar_reception -> ux_host_class_swar_reception_state = UX_HOST_CLASS_SWAR_RECEPTION_STATE_STOPPED;
92
93 /* We do not proceed. */
94 return;
95
96 }
97
98 /* And move to the next reception buffer. Check if we are at the end of the application buffer. */
99 if (swar_reception -> ux_host_class_swar_reception_data_head + swar_reception -> ux_host_class_swar_reception_block_size >=
100 swar_reception -> ux_host_class_swar_reception_data_buffer + swar_reception -> ux_host_class_swar_reception_data_buffer_size)
101 {
102
103 /* We are at the end of the buffer. Move back to the beginning if we have space available. */
104 if (swar_reception -> ux_host_class_swar_reception_data_tail == swar_reception -> ux_host_class_swar_reception_data_buffer)
105 {
106
107 /* Error trap. */
108 _ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_BUFFER_OVERFLOW);
109
110 /* If trace is enabled, insert this event into the trace buffer. */
111 UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_BUFFER_OVERFLOW, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0)
112
113 /* We have an overflow. We cannot continue. Report to the application. */
114 swar_reception -> ux_host_class_swar_reception_callback(swar, UX_BUFFER_OVERFLOW, UX_NULL, 0);
115
116 /* And stop the transfer in progress flag. */
117 swar_reception -> ux_host_class_swar_reception_state = UX_HOST_CLASS_SWAR_RECEPTION_STATE_STOPPED;
118
119 return;
120 }
121 else
122
123 /* Program the head to be at the beginning of the application buffer. */
124 swar_reception -> ux_host_class_swar_reception_data_head = swar_reception -> ux_host_class_swar_reception_data_buffer;
125
126 }
127 else
128
129 /* Program the head to be after the current buffer. */
130 swar_reception -> ux_host_class_swar_reception_data_head += swar_reception -> ux_host_class_swar_reception_block_size;
131
132
133 /* We need to report this transfer to the application. */
134 swar_reception -> ux_host_class_swar_reception_callback(swar,
135 transfer_request -> ux_transfer_request_completion_code,
136 transfer_request -> ux_transfer_request_data_pointer,
137 transfer_request -> ux_transfer_request_actual_length);
138
139 /* Arm another transfer. */
140 _ux_host_stack_transfer_request(transfer_request);
141
142 /* There is no status to be reported back to the stack. */
143 return;
144 }
145
146
