blob: 6333b8f8b89e3b9fe6d098d18b6e638b2385e511 (
plain)
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
|
/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Host Simulator Controller Driver */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_hcd_sim_host.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_hcd_sim_host_ed_obtain PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function obtains a free ED from the ED list. */
/* */
/* INPUT */
/* */
/* hcd_sim_host Pointer to host controller */
/* */
/* OUTPUT */
/* */
/* UX_HCD_SIM_HOST_ED * Pointer to ED */
/* */
/* CALLS */
/* */
/* _ux_utility_memory_set Set memory block */
/* */
/* CALLED BY */
/* */
/* Host Simulator Controller Driver */
/* */
/**************************************************************************/
UX_HCD_SIM_HOST_ED *_ux_hcd_sim_host_ed_obtain(UX_HCD_SIM_HOST *hcd_sim_host)
{
UX_HCD_SIM_HOST_ED *ed;
ULONG ed_index;
/* Start the search from the beginning of the list. */
ed = hcd_sim_host -> ux_hcd_sim_host_ed_list;
for(ed_index = 0; ed_index < _ux_system_host -> ux_system_host_max_ed; ed_index++)
{
/* Check the ED status, a free ED is marked with the UNUSED flag. */
if (ed -> ux_sim_host_ed_status == UX_UNUSED)
{
/* The ED may have been used, so we reset all fields. */
_ux_utility_memory_set(ed, 0, sizeof(UX_HCD_SIM_HOST_ED)); /* Use case of memset is verified. */
/* This ED is now marked as USED. */
ed -> ux_sim_host_ed_status = UX_USED;
/* Return ED pointer. */
return(ed);
}
/* Point to the next ED. */
ed++;
}
/* There is no available ED in the ED list. */
return(UX_NULL);
}
|
