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
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<title>UNICENS: Ucs_AmsRx_PeekMsg</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link rel="shortcut icon" type="image/x-icon" href="favicon.ico">
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
$(document).ready(initResizable);
</script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
$(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
<link href="style_html.css" rel="stylesheet" type="text/css" />
<link href="inic.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<div class="GlobalWrapper">
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td><a href="index.html"><img alt="Logo" src="logo.png"/></a></td>
<td>
<div id="projectname">UNICENS <span id="projectnumber">V2.1.0-3491</span></div>
<div id="projectbrief">User Manual and API Reference</div>
<div id="searchbox"> <div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<img id="MSearchSelect" src="search/mag_sel.png"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
alt=""/>
<input type="text" id="MSearchField" value="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
</span>
</div>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.2 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
<div id="nav-sync" class="sync"></div>
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
$(document).ready(function(){initNavTree('group___g___u_c_s___a_m_s.html','');});
</script>
<div id="doc-content">
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Pages</a></div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<div class="contents">
<a class="anchor" id="gab096e481474195cc57d4d801f1d295f2"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="struct_ucs___ams_rx___msg__t.html">Ucs_AmsRx_Msg_t</a>* Ucs_AmsRx_PeekMsg </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v___t_y_p_e_s_ga074c04d40d00986e0c869adaec8fadda.html#ga074c04d40d00986e0c869adaec8fadda">Ucs_Inst_t</a> * </td>
<td class="paramname"><em>self</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Retrieves a reference to the front-most message in the Rx queue. </p>
<p>The Application Message Service already provides a queue of completed Rx messages. <a class="el" href="group___g___u_c_s___a_m_s_gab096e481474195cc57d4d801f1d295f2.html#gab096e481474195cc57d4d801f1d295f2" title="Retrieves a reference to the front-most message in the Rx queue.">Ucs_AmsRx_PeekMsg()</a> always returns a reference to the front-most message in the Rx queue. The function call does not dequeue the message handle. Thus, multiple subsequent calls of <a class="el" href="group___g___u_c_s___a_m_s_gab096e481474195cc57d4d801f1d295f2.html#gab096e481474195cc57d4d801f1d295f2" title="Retrieves a reference to the front-most message in the Rx queue.">Ucs_AmsRx_PeekMsg()</a> will always return the same reference. After processing the front-most message, the application must call <a class="el" href="group___g___u_c_s___a_m_s_ga6f571e2e15fac1e4be068cdf0ccac44d.html#ga6f571e2e15fac1e4be068cdf0ccac44d" title="Removes and frees the front-most message from the Rx queue.">Ucs_AmsRx_ReleaseMsg()</a>. <br/>
Typically, an application will process the front-most Rx message and call <a class="el" href="group___g___u_c_s___a_m_s_ga6f571e2e15fac1e4be068cdf0ccac44d.html#ga6f571e2e15fac1e4be068cdf0ccac44d" title="Removes and frees the front-most message from the Rx queue.">Ucs_AmsRx_ReleaseMsg()</a>, which dequeues and frees the Rx message. Hence, the application must not access this this reference anymore. The next call of <a class="el" href="group___g___u_c_s___a_m_s_gab096e481474195cc57d4d801f1d295f2.html#gab096e481474195cc57d4d801f1d295f2" title="Retrieves a reference to the front-most message in the Rx queue.">Ucs_AmsRx_PeekMsg()</a> returns a reference of the following Rx message, or <code>NULL</code> if no further message is available. <br/>
However, it is possible that an application cannot process an Rx message. In that case that application must not call <a class="el" href="group___g___u_c_s___a_m_s_ga6f571e2e15fac1e4be068cdf0ccac44d.html#ga6f571e2e15fac1e4be068cdf0ccac44d" title="Removes and frees the front-most message from the Rx queue.">Ucs_AmsRx_ReleaseMsg()</a> so that the next call of <a class="el" href="group___g___u_c_s___a_m_s_gab096e481474195cc57d4d801f1d295f2.html#gab096e481474195cc57d4d801f1d295f2" title="Retrieves a reference to the front-most message in the Rx queue.">Ucs_AmsRx_PeekMsg()</a> returns again the reference to the un-processed message. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">self</td><td>The instance </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Reference to the front-most message in the Rx queue or <code>NULL</code> if the Rx queue is empty. </dd></dl>
<dl class="section warning"><dt>Warning</dt><dd>It is important that the application takes care about the life time of the Rx message object. The returned reference is valid if the application performs the peek, processing and release operation in one go. A reference returned by <a class="el" href="group___g___u_c_s___a_m_s_gab096e481474195cc57d4d801f1d295f2.html#gab096e481474195cc57d4d801f1d295f2" title="Retrieves a reference to the front-most message in the Rx queue.">Ucs_AmsRx_PeekMsg()</a> might become invalid during a call of <a class="el" href="group___g___u_c_s___i_n_i_t___a_n_d___s_r_v_ga649fb9128df6f634fc86aa03b374d822.html#ga649fb9128df6f634fc86aa03b374d822" title="The application must call this function cyclically to drive UNICENS.">Ucs_Service()</a>. The reason is that the UNICENS library might process an event which will flush the AMS Rx queue. </dd></dl>
</div>
</div>
</div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="navelem"><a class="el" href="group___g___u_c_s___a_m_s.html">Application Message Service</a></li>
<li class="footer">© 2017 Microchip Technology Inc. All rights reserved. <a href="http://www.microchip.com" target="_blank">www.microchip.com</a></li>
</ul>
</div>
</body>
<!--
Generated on Mon Apr 3 2017 13:52:59 for UNICENS by
Doxygen 1.8.2
-->
<script language="javascript">
<!--
$('#MSearchResults').wrap('<div style="position: absolute; margin-left: 444px;"></div>');
-->
</script>
</html>
|
