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
/**************************************************************************/
/* */
/* 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 */
/** */
/** Host Stack */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_stack_device_configuration_select PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function selects a specific configuration for a device. */
/* When this configuration is set to the device, by default all the */
/* device interface and their associated alternate setting 0 is */
/* activated on the device. If the device/interface class driver */
/* wishes to change the setting of a particular interface, it needs */
/* to issue a select interface setting function. */
/* */
/* INPUT */
/* */
/* configuration Pointer to configuration */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_configuration_instance_create Create configuration */
/* instance */
/* _ux_host_stack_configuration_instance_delete Delete configuration */
/* instance */
/* _ux_host_stack_configuration_set Set configuration */
/* */
/* CALLED BY */
/* */
/* Application */
/* USBX Components */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* optimized based on compile */
/* definitions, */
/* resulting in version 6.1 */
/* 02-02-2021 Chaoqiong Xiao Modified comment(s), */
/* used pointer for current */
/* selected configuration, */
/* resulting in version 6.1.4 */
/* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
/* refine power usage check, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _ux_host_stack_device_configuration_select(UX_CONFIGURATION *configuration)
{
UX_DEVICE *device;
UX_CONFIGURATION *current_configuration;
UINT status;
/* Check for validity of the configuration handle. */
if (configuration -> ux_configuration_handle != (ULONG) (ALIGN_TYPE) configuration)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_CONFIGURATION_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_CONFIGURATION_HANDLE_UNKNOWN, configuration, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_CONFIGURATION_HANDLE_UNKNOWN);
}
/* Get the device container for this configuration. */
device = configuration -> ux_configuration_device;
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_DEVICE_CONFIGURATION_SELECT, device, configuration, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
/* We need to check the amount of power the bus powered device is consuming
before switch configuration. Otherwise we may run the risk of
an over current fault. */
if (((configuration -> ux_configuration_descriptor.bmAttributes & UX_CONFIGURATION_DEVICE_SELF_POWERED) == 0) &&
(configuration -> ux_configuration_descriptor.MaxPower > UX_DEVICE_MAX_POWER_GET(device)))
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_ENUMERATOR, UX_OVER_CURRENT_CONDITION);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_OVER_CURRENT_CONDITION, configuration, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_OVER_CURRENT_CONDITION);
}
/* Check for the state of the device . If the device is already configured,
we need to cancel the existing configuration before enabling this one. */
if (device -> ux_device_state == UX_DEVICE_CONFIGURED)
{
/* The device is configured. Get the first configuration pointer. */
current_configuration = device -> ux_device_current_configuration;
/* Deselect this instance */
_ux_host_stack_configuration_instance_delete(current_configuration);
}
/* The device can now be configured. */
status = _ux_host_stack_configuration_set(configuration);
if (status != UX_SUCCESS)
return(status);
/* Create the configuration instance. */
status = _ux_host_stack_configuration_instance_create(configuration);
/* Return completion status. */
return(status);
}