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_endpoint_reset PORTABLE C */
37 /* 6.1 */
38 /* AUTHOR */
39 /* */
40 /* Chaoqiong Xiao, Microsoft Corporation */
41 /* */
42 /* DESCRIPTION */
43 /* */
44 /* This function resets an endpoint after a stall or other error */
45 /* condition. */
46 /* */
47 /* INPUT */
48 /* */
49 /* endpoint Endpoint to abort transfer */
50 /* */
51 /* OUTPUT */
52 /* */
53 /* Completion Status */
54 /* */
55 /* CALLS */
56 /* */
57 /* _ux_host_stack_transfer_request Send transfer request */
58 /* (ux_hcd_entry_function) HCD entry function */
59 /* */
60 /* CALLED BY */
61 /* */
62 /* USBX Components */
63 /* */
64 /* RELEASE HISTORY */
65 /* */
66 /* DATE NAME DESCRIPTION */
67 /* */
68 /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
69 /* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
70 /* optimized based on compile */
71 /* definitions, */
72 /* resulting in version 6.1 */
73 /* */
74 /**************************************************************************/
_ux_host_stack_endpoint_reset(UX_ENDPOINT * endpoint)75 UINT _ux_host_stack_endpoint_reset(UX_ENDPOINT *endpoint)
76 {
77
78 UX_ENDPOINT *control_endpoint;
79 UX_TRANSFER *transfer_request;
80 UX_DEVICE *device;
81 UX_HCD *hcd;
82 UINT status;
83
84
85 /* Get the device container from the endpoint */
86 device = endpoint -> ux_endpoint_device;
87
88 /* If trace is enabled, insert this event into the trace buffer. */
89 UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_STACK_ENDPOINT_RESET, device, endpoint, 0, 0, UX_TRACE_HOST_STACK_EVENTS, 0, 0)
90
91 /* Get the control endpoint attached to the device. */
92 control_endpoint = &device -> ux_device_control_endpoint;
93
94 /* Retrieve the transfer_request pointer. */
95 transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
96
97 /* Create a transfer_request for the CLEAR_FEATURE request. */
98 transfer_request -> ux_transfer_request_data_pointer = UX_NULL;
99 transfer_request -> ux_transfer_request_requested_length = 0;
100 transfer_request -> ux_transfer_request_function = UX_CLEAR_FEATURE;
101 transfer_request -> ux_transfer_request_type = UX_REQUEST_OUT| UX_REQUEST_TYPE_STANDARD | UX_REQUEST_TARGET_ENDPOINT;
102 transfer_request -> ux_transfer_request_value = UX_ENDPOINT_HALT;
103 transfer_request -> ux_transfer_request_index = endpoint -> ux_endpoint_descriptor.bEndpointAddress;
104
105 /* Send request to HCD layer. */
106 status = _ux_host_stack_transfer_request(transfer_request);
107
108 /* Reset the endpoint at the HCD level. */
109 if (status == UX_SUCCESS)
110 {
111
112 /* Pickup HCD pointer. */
113 hcd = UX_DEVICE_HCD_GET(device);
114
115 /* Call HCD entry function. */
116 status = hcd -> ux_hcd_entry_function(hcd, UX_HCD_RESET_ENDPOINT, endpoint);
117 }
118
119 /* And return the completion status. */
120 return(status);
121 }
122
123
