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 Stack */
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_stack.h"
30
31
32 /**************************************************************************/
33 /* */
34 /* FUNCTION RELEASE */
35 /* */
36 /* _ux_host_stack_interface_set PORTABLE C */
37 /* 6.1.12 */
38 /* AUTHOR */
39 /* */
40 /* Chaoqiong Xiao, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This function performs a setting of an alternate setting for a */
45 /* specific interface. */
46 /* */
47 /* INPUT */
48 /* */
49 /* interface Pointer to interface */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* Completion Status */
54 /* */
55 /* CALLS */
56 /* */
57 /* _ux_host_stack_hcd_transfer_request HCD transfer request */
58 /* */
59 /* CALLED BY */
60 /* */
61 /* USBX Components */
62 /* */
63 /* RELEASE HISTORY */
64 /* */
65 /* DATE NAME DESCRIPTION */
66 /* */
67 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
68 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
69 /* resulting in version 6.1 */
70 /* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
71 /* added standalone support, */
72 /* resulting in version 6.1.10 */
73 /* 07-29-2022 Chaoqiong Xiao Modified comment(s), */
74 /* fixed parameter/variable */
75 /* names conflict C++ keyword, */
76 /* resulting in version 6.1.12 */
77 /* */
78 /**************************************************************************/
_ux_host_stack_interface_set(UX_INTERFACE * interface_ptr)79 UINT _ux_host_stack_interface_set(UX_INTERFACE *interface_ptr)
80 {
81
82 UX_DEVICE *device;
83 UX_CONFIGURATION *configuration;
84 UX_TRANSFER *transfer_request;
85 UINT status;
86 UX_ENDPOINT *control_endpoint;
87
88 /* If trace is enabled, insert this event into the trace buffer. */
89 UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_INTERFACE_SET, interface_ptr, 0, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
90
91 /* Retrieve the pointer to the control endpoint and its transfer_request.
92 From the interface we go back to the configuration, then the device.
93 The device contains the default control endpoint container. */
94 configuration = interface_ptr -> ux_interface_configuration;
95 device = configuration -> ux_configuration_device;
96 control_endpoint = &device -> ux_device_control_endpoint;
97 transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
98
99 /* Create a transfer_request for the SET_INTERFACE request. No data for this request */
100 transfer_request -> ux_transfer_request_requested_length = 0;
101 transfer_request -> ux_transfer_request_function = UX_SET_INTERFACE;
102 transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT | UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_INTERFACE;
103 transfer_request -> ux_transfer_request_index = (USHORT) interface_ptr -> ux_interface_descriptor.bInterfaceNumber;
104 transfer_request -> ux_transfer_request_value = (USHORT) interface_ptr -> ux_interface_descriptor.bAlternateSetting;
105
106 /* Send request. */
107 status = _ux_host_stack_transfer_request(transfer_request);
108
109 /* Return status completion. */
110 return(status);
111 }
112
113
