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 /** USBX Component */
16 /** */
17 /** Device CDC_ECM Class */
18 /** */
19 /**************************************************************************/
20 /**************************************************************************/
21
22 #define UX_SOURCE_CODE
23
24
25 /* Include necessary system files. */
26
27 #include "ux_api.h"
28 #include "ux_device_class_cdc_ecm.h"
29 #include "ux_device_stack.h"
30
31
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _ux_device_class_cdc_ecm_write PORTABLE C */
37 /* 6.1.11 */
38 /* AUTHOR */
39 /* */
40 /* Chaoqiong Xiao, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This function writes a packet into a queue for later thread */
45 /* processing. */
46 /* */
47 /* INPUT */
48 /* */
49 /* cdc_ecm Address of cdc_ecm class */
50 /* instance */
51 /* */
52 /* OUTPUT */
53 /* */
54 /* None */
55 /* */
56 /* CALLS */
57 /* */
58 /* _ux_device_stack_transfer_request Transfer request */
59 /* _ux_device_mutex_off Release mutex */
60 /* _ux_device_event_flags_set Set event flags */
61 /* */
62 /* CALLED BY */
63 /* */
64 /* ThreadX */
65 /* */
66 /* RELEASE HISTORY */
67 /* */
68 /* DATE NAME DESCRIPTION */
69 /* */
70 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
71 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
72 /* used UX prefix to refer to */
73 /* TX symbols instead of using */
74 /* them directly, */
75 /* resulting in version 6.1 */
76 /* 04-25-2022 Chaoqiong Xiao Modified comment(s), */
77 /* fixed standalone compile, */
78 /* resulting in version 6.1.11 */
79 /* */
80 /**************************************************************************/
_ux_device_class_cdc_ecm_write(VOID * cdc_ecm_class,NX_PACKET * packet)81 UINT _ux_device_class_cdc_ecm_write(VOID *cdc_ecm_class, NX_PACKET *packet)
82 {
83 #if defined(UX_DEVICE_STANDALONE)
84 UX_PARAMETER_NOT_USED(cdc_ecm_class);
85 UX_PARAMETER_NOT_USED(packet);
86 return(UX_FUNCTION_NOT_SUPPORTED);
87 #else
88
89 UINT status;
90 UX_SLAVE_CLASS_CDC_ECM *cdc_ecm;
91
92 /* Proper class casting. */
93 cdc_ecm = (UX_SLAVE_CLASS_CDC_ECM *) cdc_ecm_class;
94
95 /* Protect this thread. */
96 _ux_device_mutex_on(&cdc_ecm -> ux_slave_class_cdc_ecm_mutex);
97
98 /* We only want to send the packet if the link is up. */
99 if (cdc_ecm->ux_slave_class_cdc_ecm_link_state == UX_DEVICE_CLASS_CDC_ECM_LINK_STATE_UP)
100 {
101
102 /* Check the queue. See if there is something that is being sent. */
103 if (cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue == UX_NULL)
104
105 /* Memorize this packet at the beginning of the queue. */
106 cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue = packet;
107
108 else
109
110 /* Add the packet to the end of the queue. */
111 cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue_tail -> nx_packet_queue_next = packet;
112
113 /* Set the tail. */
114 cdc_ecm -> ux_slave_class_cdc_ecm_xmit_queue_tail = packet;
115
116 /* The packet to be sent is the last in the chain. */
117 packet -> nx_packet_queue_next = NX_NULL;
118
119 /* Free Mutex resource. */
120 _ux_device_mutex_off(&cdc_ecm -> ux_slave_class_cdc_ecm_mutex);
121
122 /* Set an event to wake up the bulkin thread. */
123 _ux_device_event_flags_set(&cdc_ecm -> ux_slave_class_cdc_ecm_event_flags_group, UX_DEVICE_CLASS_CDC_ECM_NEW_BULKIN_EVENT, UX_OR);
124
125 /* Packet successfully added. Return success. */
126 status = UX_SUCCESS;
127 }
128 else
129 {
130
131 /* Free Mutex resource. */
132 _ux_device_mutex_off(&cdc_ecm -> ux_slave_class_cdc_ecm_mutex);
133
134 /* Report error to application. */
135 _ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_CLASS_CDC_ECM_LINK_STATE_DOWN_ERROR);
136
137 /* Return error. */
138 status = UX_ERROR;
139 }
140
141 /* We are done here. */
142 return(status);
143 #endif
144 }
145
