235 lines
16 KiB
HTML
235 lines
16 KiB
HTML
<!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>Generic Wait Functions</title>
|
|
<title>CMSIS-RTOS2: Generic Wait Functions</title>
|
|
<link href="tabs.css" rel="stylesheet" type="text/css"/>
|
|
<link href="cmsis.css" rel="stylesheet" type="text/css" />
|
|
<script type="text/javascript" src="jquery.js"></script>
|
|
<script type="text/javascript" src="dynsections.js"></script>
|
|
<script type="text/javascript" src="printComponentTabs.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);
|
|
$(window).load(resizeHeight);
|
|
</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>
|
|
</head>
|
|
<body>
|
|
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
|
|
<div id="titlearea">
|
|
<table cellspacing="0" cellpadding="0">
|
|
<tbody>
|
|
<tr style="height: 46px;">
|
|
<td id="projectlogo"><img alt="Logo" src="CMSIS_Logo_Final.png"/></td>
|
|
<td style="padding-left: 0.5em;">
|
|
<div id="projectname">CMSIS-RTOS2
|
|
 <span id="projectnumber">Version 2.1.3</span>
|
|
</div>
|
|
<div id="projectbrief">Real-Time Operating System: API and RTX Reference Implementation</div>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
<!-- end header part -->
|
|
<div id="CMSISnav" class="tabs1">
|
|
<ul class="tablist">
|
|
<script type="text/javascript">
|
|
<!--
|
|
writeComponentTabs.call(this);
|
|
//-->
|
|
</script>
|
|
</ul>
|
|
</div>
|
|
<!-- Generated by Doxygen 1.8.6 -->
|
|
<script type="text/javascript">
|
|
var searchBox = new SearchBox("searchBox", "search",false,'Search');
|
|
</script>
|
|
<div id="navrow1" class="tabs">
|
|
<ul class="tablist">
|
|
<li><a href="index.html"><span>Main Page</span></a></li>
|
|
<li><a href="pages.html"><span>Usage and Description</span></a></li>
|
|
<li><a href="modules.html"><span>Reference</span></a></li>
|
|
<li>
|
|
<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>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</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__CMSIS__RTOS__Wait.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>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Macros</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(9)"><span class="SelectionMark"> </span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(10)"><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="header">
|
|
<div class="summary">
|
|
<a href="#func-members">Functions</a> </div>
|
|
<div class="headertitle">
|
|
<div class="title">Generic Wait Functions<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS API v2</a></div></div> </div>
|
|
</div><!--header-->
|
|
<div class="contents">
|
|
|
|
<p>Wait for a certain period of time.
|
|
<a href="#details">More...</a></p>
|
|
<table class="memberdecls">
|
|
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
|
|
Functions</h2></td></tr>
|
|
<tr class="memitem:gaf6055a51390ef65b6b6edc28bf47322e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a> (uint32_t ticks)</td></tr>
|
|
<tr class="memdesc:gaf6055a51390ef65b6b6edc28bf47322e"><td class="mdescLeft"> </td><td class="mdescRight">Wait for Timeout (Time Delay). <a href="#gaf6055a51390ef65b6b6edc28bf47322e">More...</a><br/></td></tr>
|
|
<tr class="separator:gaf6055a51390ef65b6b6edc28bf47322e"><td class="memSeparator" colspan="2"> </td></tr>
|
|
<tr class="memitem:ga3c807924c2d6d43bc2ffb49da3f7f3a1"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a> (uint32_t ticks)</td></tr>
|
|
<tr class="memdesc:ga3c807924c2d6d43bc2ffb49da3f7f3a1"><td class="mdescLeft"> </td><td class="mdescRight">Wait until specified time. <a href="#ga3c807924c2d6d43bc2ffb49da3f7f3a1">More...</a><br/></td></tr>
|
|
<tr class="separator:ga3c807924c2d6d43bc2ffb49da3f7f3a1"><td class="memSeparator" colspan="2"> </td></tr>
|
|
</table>
|
|
<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
|
|
<p>The generic wait functions provide means for a time delay.</p>
|
|
<dl class="section note"><dt>Note</dt><dd>Generic wait functions cannot be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>. </dd></dl>
|
|
<h2 class="groupheader">Function Documentation</h2>
|
|
<a class="anchor" id="gaf6055a51390ef65b6b6edc28bf47322e"></a>
|
|
<div class="memitem">
|
|
<div class="memproto">
|
|
<table class="memname">
|
|
<tr>
|
|
<td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osDelay </td>
|
|
<td>(</td>
|
|
<td class="paramtype">uint32_t </td>
|
|
<td class="paramname"><em>ticks</em></td><td>)</td>
|
|
<td></td>
|
|
</tr>
|
|
</table>
|
|
</div><div class="memdoc">
|
|
<dl class="params"><dt>Parameters</dt><dd>
|
|
<table class="params">
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td><a class="el" href="theory_of_operation.html#CMSIS_RTOS_TimeOutValue">time ticks</a> value </td></tr>
|
|
</table>
|
|
</dd>
|
|
</dl>
|
|
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
|
|
<p>The function <b>osDelay</b> waits for a time period specified in kernel <em>ticks</em>. For a value of <span class="XML-Token">1</span> the system waits until the next timer tick occurs. The actual time delay may be up to one timer tick less than specified, i.e. calling <code>osDelay(1)</code> right before the next system tick occurs the thread is rescheduled immediately.</p>
|
|
<p>The delayed thread is put into the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">BLOCKED</a> state and a context switch occurs immediately. The thread is automatically put back to the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state after the given amount of ticks has elapsed. If the thread will have the highest priority in <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state it will being scheduled immediately.</p>
|
|
<p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p>
|
|
<ul>
|
|
<li><em>osOK:</em> the time delay is executed.</li>
|
|
<li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a> cannot be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</li>
|
|
</ul>
|
|
<dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
|
|
<p><b>Code Example</b> </p>
|
|
<div class="fragment"><div class="line"><span class="preprocessor">#include "<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>"</span></div>
|
|
<div class="line"> </div>
|
|
<div class="line"><span class="keywordtype">void</span> Thread_1 (<span class="keywordtype">void</span> *arg) { <span class="comment">// Thread function</span></div>
|
|
<div class="line"> osStatus_t status; <span class="comment">// capture the return status</span></div>
|
|
<div class="line"> uint32_t delayTime; <span class="comment">// delay time in milliseconds</span></div>
|
|
<div class="line"> </div>
|
|
<div class="line"> delayTime = 1000; <span class="comment">// delay 1 second</span></div>
|
|
<div class="line"> status = <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a> (delayTime); <span class="comment">// suspend thread execution</span></div>
|
|
<div class="line">}</div>
|
|
</div><!-- fragment -->
|
|
</div>
|
|
</div>
|
|
<a class="anchor" id="ga3c807924c2d6d43bc2ffb49da3f7f3a1"></a>
|
|
<div class="memitem">
|
|
<div class="memproto">
|
|
<table class="memname">
|
|
<tr>
|
|
<td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osDelayUntil </td>
|
|
<td>(</td>
|
|
<td class="paramtype">uint32_t </td>
|
|
<td class="paramname"><em>ticks</em></td><td>)</td>
|
|
<td></td>
|
|
</tr>
|
|
</table>
|
|
</div><div class="memdoc">
|
|
<dl class="params"><dt>Parameters</dt><dd>
|
|
<table class="params">
|
|
<tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td>absolute time in ticks </td></tr>
|
|
</table>
|
|
</dd>
|
|
</dl>
|
|
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
|
|
<p>The function <b>osDelayUntil</b> waits until an absolute time (specified in kernel <em>ticks</em>) is reached.</p>
|
|
<p>The corner case when the kernel tick counter overflows is handled by <b>osDelayUntil</b>. Thus it is absolutely legal to provide a value which is lower than the current tick value, i.e. returned by <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b">osKernelGetTickCount</a>. Typically as a user you do not have to take care about the overflow. The only limitation you have to have in mind is that the maximum delay is limited to (2<sup>31</sup>)-1 ticks.</p>
|
|
<p>The delayed thread is put into the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">BLOCKED</a> state and a context switch occurs immediately. The thread is automatically put back to the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state when the given time is reached. If the thread will have the highest priority in <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state it will being scheduled immediately.</p>
|
|
<p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p>
|
|
<ul>
|
|
<li><em>osOK:</em> the time delay is executed.</li>
|
|
<li><em>osParameter:</em> the time cannot be handled (out of bounds).</li>
|
|
<li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a> cannot be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</li>
|
|
</ul>
|
|
<dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
|
|
<p><b>Code Example</b> </p>
|
|
<div class="fragment"><div class="line"><span class="preprocessor">#include "<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>"</span></div>
|
|
<div class="line"> </div>
|
|
<div class="line"><span class="keywordtype">void</span> Thread_1 (<span class="keywordtype">void</span> *arg) { <span class="comment">// Thread function</span></div>
|
|
<div class="line"> uint32_t tick;</div>
|
|
<div class="line"></div>
|
|
<div class="line"> tick = <a class="code" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b">osKernelGetTickCount</a>(); <span class="comment">// retrieve the number of system ticks</span></div>
|
|
<div class="line"> <span class="keywordflow">for</span> (;;) {</div>
|
|
<div class="line"> tick += 1000; <span class="comment">// delay 1000 ticks periodically</span></div>
|
|
<div class="line"> <a class="code" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a>(tick);</div>
|
|
<div class="line"> <span class="comment">// ...</span></div>
|
|
<div class="line"> }</div>
|
|
<div class="line">}</div>
|
|
</div><!-- fragment -->
|
|
</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="footer">Generated on Wed Aug 1 2018 17:12:45 for CMSIS-RTOS2 by Arm Ltd. All rights reserved.
|
|
<!--
|
|
<a href="http://www.doxygen.org/index.html">
|
|
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.6
|
|
-->
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</body>
|
|
</html>
|