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 /** ACM CDC 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_cdc_acm.h"
30 #include "ux_host_stack.h"
31
32
33 /**************************************************************************/
34 /* */
35 /* FUNCTION RELEASE */
36 /* */
37 /* _ux_host_class_cdc_acm_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_cdc_acm_reception_callback(UX_TRANSFER * transfer_request)74 VOID _ux_host_class_cdc_acm_reception_callback (UX_TRANSFER *transfer_request)
75 {
76
77 UX_HOST_CLASS_CDC_ACM *cdc_acm;
78 UX_HOST_CLASS_CDC_ACM_RECEPTION *cdc_acm_reception;
79
80 /* Get the class instance for this transfer request. */
81 cdc_acm = (UX_HOST_CLASS_CDC_ACM *) transfer_request -> ux_transfer_request_class_instance;
82
83 /* Get the pointer to the acm reception structure. */
84 cdc_acm_reception = cdc_acm -> ux_host_class_cdc_acm_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 cdc_acm_reception -> ux_host_class_cdc_acm_reception_state = UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STOPPED;
92
93 /* We do not proceed. */
94 return;
95
96 }
97
98 /* Move to the next reception buffer. Check if we are at the end of the application buffer. */
99 if (cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head + cdc_acm_reception -> ux_host_class_cdc_acm_reception_block_size >=
100 cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer + cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer_size)
101
102 /* Program the head to be at the beginning of the application buffer. */
103 cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head = cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_buffer;
104
105 else
106
107 /* Program the head to be after the current buffer. */
108 cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head += cdc_acm_reception -> ux_host_class_cdc_acm_reception_block_size;
109
110 /* OVERFLOW check: if the head reaches the tail buffer that contains reception data */
111 if (cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_tail == cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head)
112 {
113
114 /* Error trap. */
115 _ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_BUFFER_OVERFLOW);
116
117 /* If trace is enabled, insert this event into the trace buffer. */
118 UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_BUFFER_OVERFLOW, transfer_request, 0, 0, UX_TRACE_ERRORS, 0, 0)
119
120 /* We have an overflow. We cannot continue. Report to the application. */
121 cdc_acm_reception -> ux_host_class_cdc_acm_reception_callback(cdc_acm, UX_BUFFER_OVERFLOW, UX_NULL, 0);
122
123 /* And stop the transfer in progress flag. */
124 cdc_acm_reception -> ux_host_class_cdc_acm_reception_state = UX_HOST_CLASS_CDC_ACM_RECEPTION_STATE_STOPPED;
125
126 return;
127 }
128
129 /* We need to report this transfer to the application. */
130 cdc_acm_reception -> ux_host_class_cdc_acm_reception_callback(cdc_acm,
131 transfer_request -> ux_transfer_request_completion_code,
132 transfer_request -> ux_transfer_request_data_pointer,
133 transfer_request -> ux_transfer_request_actual_length);
134
135 /* Set data pointer to the next reception buffer. */
136 transfer_request -> ux_transfer_request_data_pointer = cdc_acm_reception -> ux_host_class_cdc_acm_reception_data_head;
137
138 /* Arm another transfer. */
139 _ux_host_stack_transfer_request(transfer_request);
140
141 /* There is no status to be reported back to the stack. */
142 return;
143 }
144
145
