<!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>Timer Management</title> <title>CMSIS-RTOS: Timer Management</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" 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<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__TimerMgmt.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" 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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="#define-members">Macros</a> | <a href="#enum-members">Enumerations</a> | <a href="#func-members">Functions</a> </div> <div class="headertitle"> <div class="title">Timer Management<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS API</a></div></div> </div> </div><!--header--> <div class="contents"> <p>Create and control timer and timer callback functions. <a href="#details">More...</a></p> <table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a> Macros</h2></td></tr> <tr class="memitem:ga1c720627e08d1cc1afcad44e799ed492"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a>(name, function)</td></tr> <tr class="memdesc:ga1c720627e08d1cc1afcad44e799ed492"><td class="mdescLeft"> </td><td class="mdescRight">Define a Timer object. <a href="#ga1c720627e08d1cc1afcad44e799ed492">More...</a><br/></td></tr> <tr class="separator:ga1c720627e08d1cc1afcad44e799ed492"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga1b8d670eaf964b2910fa06885e650678"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(name)   &os_timer_def_##name</td></tr> <tr class="memdesc:ga1b8d670eaf964b2910fa06885e650678"><td class="mdescLeft"> </td><td class="mdescRight">Access a Timer definition. <a href="#ga1b8d670eaf964b2910fa06885e650678">More...</a><br/></td></tr> <tr class="separator:ga1b8d670eaf964b2910fa06885e650678"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="enum-members"></a> Enumerations</h2></td></tr> <tr class="memitem:gadac860eb9e1b4b0619271e6595ed83d9"><td class="memItemLeft" align="right" valign="top">enum  </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9">os_timer_type</a> { <br/>   <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ad21712f8df5f97069c82dc9eec37b951">osTimerOnce</a> = 0, <br/>   <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ab9c91f9699162edb09bb7c90c11c8788">osTimerPeriodic</a> = 1 <br/> }</td></tr> <tr class="separator:gadac860eb9e1b4b0619271e6595ed83d9"><td class="memSeparator" colspan="2"> </td></tr> </table><table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a> Functions</h2></td></tr> <tr class="memitem:gaedd312bfdca04e0b8162b666e09a1ae6"><td class="memItemLeft" align="right" valign="top"><a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> (const <a class="el" href="structosTimerDef__t.html">osTimerDef_t</a> *timer_def, <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9">os_timer_type</a> type, void *argument)</td></tr> <tr class="memdesc:gaedd312bfdca04e0b8162b666e09a1ae6"><td class="mdescLeft"> </td><td class="mdescRight">Create a timer. <a href="#gaedd312bfdca04e0b8162b666e09a1ae6">More...</a><br/></td></tr> <tr class="separator:gaedd312bfdca04e0b8162b666e09a1ae6"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga27a797a401b068e2644d1125f22a07ca"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a> (<a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> timer_id, uint32_t millisec)</td></tr> <tr class="memdesc:ga27a797a401b068e2644d1125f22a07ca"><td class="mdescLeft"> </td><td class="mdescRight">Start or restart a timer. <a href="#ga27a797a401b068e2644d1125f22a07ca">More...</a><br/></td></tr> <tr class="separator:ga27a797a401b068e2644d1125f22a07ca"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga58f36b121a812936435cacc6e1e0e091"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga58f36b121a812936435cacc6e1e0e091">osTimerStop</a> (<a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> timer_id)</td></tr> <tr class="memdesc:ga58f36b121a812936435cacc6e1e0e091"><td class="mdescLeft"> </td><td class="mdescRight">Stop the timer. <a href="#ga58f36b121a812936435cacc6e1e0e091">More...</a><br/></td></tr> <tr class="separator:ga58f36b121a812936435cacc6e1e0e091"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga746b8043d906849bd65e3900fcb483cf"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga746b8043d906849bd65e3900fcb483cf">osTimerDelete</a> (<a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> timer_id)</td></tr> <tr class="memdesc:ga746b8043d906849bd65e3900fcb483cf"><td class="mdescLeft"> </td><td class="mdescRight">Delete a timer that was created by <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>. <a href="#ga746b8043d906849bd65e3900fcb483cf">More...</a><br/></td></tr> <tr class="separator:ga746b8043d906849bd65e3900fcb483cf"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Description</h2> <p>In addition to the <a class="el" href="group__CMSIS__RTOS__Wait.html">Generic Wait Functions</a> CMSIS-RTOS also supports virtual timer objects. These timer objects can trigger the execution of a function (not threads). When a timer expires, a callback function is executed to run associated code with the timer. The timer number is passed as a parameter to the callback function. Each timer can be configured as a one-shot or a periodic timer. A periodic timer repeats its operation until it is <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga746b8043d906849bd65e3900fcb483cf">deleted</a> or <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga58f36b121a812936435cacc6e1e0e091">stopped</a>. All timers can be <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">started, restarted</a>, or <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga58f36b121a812936435cacc6e1e0e091">stopped</a>.</p> <p>Timers are handled in the thread <b>osTimerThread</b>. Callback functions run under control of this thread and may use other CMSIS-RTOS API calls.</p> <p>The figure below shows the behavior of a periodic timer. For one-shot timers, the timer stops after execution of the callback function.</p> <div class="image"> <img src="Timer.png" alt="Timer.png"/> <div class="caption"> Behavior of a Periodic Timer</div></div> <h2>Working with Timers </h2> <p>The following steps are required to use a timer:</p> <ol type="1"> <li>Define the timers: <div class="fragment"><div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a>(one_shot, start_machine); <span class="comment">// when the timer expires, the function start_machine is called</span></div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a>(periodic, toggle_power); <span class="comment">// when the timer expires, the function toggle_power is called</span></div> <div class="line"><a class="code" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> one_shot_id, periodic_id;</div> </div><!-- fragment --></li> <li>Instantiate and start the timers in an RTOS thread: <div class="fragment"><div class="line">one_shot_id = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>(<a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(one_shot), <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ad21712f8df5f97069c82dc9eec37b951">osTimerOnce</a>, (<span class="keywordtype">void</span> *)0); <span class="comment">// creates a one-shot timer;</span></div> <div class="line"> <span class="comment">// (void*)0 is passed as an argument to the callback function</span></div> <div class="line">periodic_id = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>(<a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(periodic), <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ab9c91f9699162edb09bb7c90c11c8788">osTimerPeriodic</a>, (<span class="keywordtype">void</span> *)5); <span class="comment">// creates a periodic timer;</span></div> <div class="line"> <span class="comment">// (void*)5 is passed as an argument to the callback function</span></div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a>(one_shot_id, 500);</div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a>(periodic, 1500);</div> </div><!-- fragment --> </li> </ol> <h2 class="groupheader">Macro Definition Documentation</h2> <a class="anchor" id="ga1b8d670eaf964b2910fa06885e650678"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define osTimer</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname">name</td><td>)</td> <td>   &os_timer_def_##name</td> </tr> </table> </div><div class="memdoc"> <p>Access to the timer definition for the function <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>.</p> <dl class="params"><dt>Parameters</dt><dd> <table class="params"> <tr><td class="paramname">name</td><td>name of the timer object. </td></tr> </table> </dd> </dl> <dl class="section note"><dt>Note</dt><dd>CAN BE CHANGED: The parameter to <b>osTimer</b> shall be consistent but the macro body is implementation specific in every CMSIS-RTOS. </dd></dl> </div> </div> <a class="anchor" id="ga1c720627e08d1cc1afcad44e799ed492"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">#define osTimerDef</td> <td>(</td> <td class="paramtype"> </td> <td class="paramname">name, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"> </td> <td class="paramname">function </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> <p>Define the attributes of a timer.</p> <dl class="params"><dt>Parameters</dt><dd> <table class="params"> <tr><td class="paramname">name</td><td>name of the timer object. </td></tr> <tr><td class="paramname">function</td><td>name of the timer call back function. </td></tr> </table> </dd> </dl> <dl class="section note"><dt>Note</dt><dd>CAN BE CHANGED: The parameter to <b>osTimerDef</b> shall be consistent but the macro body is implementation specific in every CMSIS-RTOS. </dd></dl> </div> </div> <h2 class="groupheader">Enumeration Type Documentation</h2> <a class="anchor" id="gadac860eb9e1b4b0619271e6595ed83d9"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">enum <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9">os_timer_type</a></td> </tr> </table> </div><div class="memdoc"> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>os_timer_type</b> shall be consistent in every CMSIS-RTOS. The <a class="el" href="cmsis__os_8h.html#adac860eb9e1b4b0619271e6595ed83d9">os_timer_type</a> specifies the a repeating (periodic) or one-shot timer for the function <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>. </dd></dl> <table class="fieldtable"> <tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><em><a class="anchor" id="gadac860eb9e1b4b0619271e6595ed83d9ad21712f8df5f97069c82dc9eec37b951"></a>osTimerOnce</em> </td><td class="fielddoc"> <p>one-shot timer </p> </td></tr> <tr><td class="fieldname"><em><a class="anchor" id="gadac860eb9e1b4b0619271e6595ed83d9ab9c91f9699162edb09bb7c90c11c8788"></a>osTimerPeriodic</em> </td><td class="fielddoc"> <p>repeating timer </p> </td></tr> </table> </div> </div> <h2 class="groupheader">Function Documentation</h2> <a class="anchor" id="gaedd312bfdca04e0b8162b666e09a1ae6"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> osTimerCreate </td> <td>(</td> <td class="paramtype">const <a class="el" href="structosTimerDef__t.html">osTimerDef_t</a> * </td> <td class="paramname"><em>timer_def</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9">os_timer_type</a> </td> <td class="paramname"><em>type</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">void * </td> <td class="paramname"><em>argument</em> </td> </tr> <tr> <td></td> <td>)</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">timer_def</td><td>timer object referenced with <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>. </td></tr> <tr><td class="paramdir">[in]</td><td class="paramname">type</td><td>osTimerOnce for one-shot or osTimerPeriodic for periodic behavior. </td></tr> <tr><td class="paramdir">[in]</td><td class="paramname">argument</td><td>argument to the timer call back function. </td></tr> </table> </dd> </dl> <dl class="section return"><dt>Returns</dt><dd>timer ID for reference by other functions or NULL in case of error. </dd></dl> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osTimerCreate</b> shall be consistent in every CMSIS-RTOS.</dd></dl> <p>Create a one-shot or periodic timer and associate it with a callback function argument. The timer is in stopped until it is started with <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a>.</p> <dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="functionOverview.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__os_8h.html">cmsis_os.h</a>"</span></div> <div class="line"> </div> <div class="line"><span class="keywordtype">void</span> Timer1_Callback (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg); <span class="comment">// prototypes for timer callback function</span></div> <div class="line"><span class="keywordtype">void</span> Timer2_Callback (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg); </div> <div class="line"> </div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a> (Timer1, Timer1_Callback); <span class="comment">// define timers</span></div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a> (Timer2, Timer2_Callback);</div> <div class="line"> </div> <div class="line">uint32_t exec1; <span class="comment">// argument for the timer call back function</span></div> <div class="line">uint32_t exec2; <span class="comment">// argument for the timer call back function</span></div> <div class="line"> </div> <div class="line"><span class="keywordtype">void</span> TimerCreate_example (<span class="keywordtype">void</span>) {</div> <div class="line"> <a class="code" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> id1; <span class="comment">// timer id</span></div> <div class="line"> <a class="code" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> id2; <span class="comment">// timer id</span></div> <div class="line"> </div> <div class="line"> <span class="comment">// Create one-shoot timer</span></div> <div class="line"> exec1 = 1;</div> <div class="line"> id1 = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> (<a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(Timer1), <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ad21712f8df5f97069c82dc9eec37b951">osTimerOnce</a>, &exec1);</div> <div class="line"> <span class="keywordflow">if</span> (id1 != NULL) {</div> <div class="line"> <span class="comment">// One-shoot timer created</span></div> <div class="line"> }</div> <div class="line"> </div> <div class="line"> <span class="comment">// Create periodic timer</span></div> <div class="line"> exec2 = 2;</div> <div class="line"> id2 = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> (<a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(Timer2), <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ab9c91f9699162edb09bb7c90c11c8788">osTimerPeriodic</a>, &exec2);</div> <div class="line"> <span class="keywordflow">if</span> (id2 != NULL) {</div> <div class="line"> <span class="comment">// Periodic timer created</span></div> <div class="line"> }</div> <div class="line"> :</div> <div class="line">}</div> </div><!-- fragment --> </div> </div> <a class="anchor" id="ga746b8043d906849bd65e3900fcb483cf"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osTimerDelete </td> <td>(</td> <td class="paramtype"><a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> </td> <td class="paramname"><em>timer_id</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">timer_id</td><td>timer ID obtained by <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>. </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> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osTimerDelete</b> shall be consistent in every CMSIS-RTOS.</dd></dl> <p>Delete the timer object.</p> <p><b><a class="el" href="group__CMSIS__RTOS__Status.html">Status and Error Codes</a></b><br/> </p> <ul> <li><em>osOK:</em> the specified timer has been deleted.</li> <li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga746b8043d906849bd65e3900fcb483cf">osTimerDelete</a> cannot be called from interrupt service routines.</li> <li><em>osErrorParameter:</em> <em>timer_id</em> is incorrect.</li> </ul> <dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="functionOverview.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__os_8h.html">cmsis_os.h</a>"</span></div> <div class="line"></div> <div class="line"><span class="keywordtype">void</span> Timer_Callback (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg); <span class="comment">// prototype for timer callback function</span></div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a> (Timer, Timer_Callback); <span class="comment">// define timer</span></div> <div class="line"> </div> <div class="line"><span class="keywordtype">void</span> TimerDelete_example (<span class="keywordtype">void</span>) {</div> <div class="line"> <a class="code" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> id; <span class="comment">// timer id</span></div> <div class="line"> <a class="code" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> status; <span class="comment">// function return status </span></div> <div class="line"> </div> <div class="line"> <span class="comment">// Create periodic timer</span></div> <div class="line"> exec = 1;</div> <div class="line"> <span class="keywordtype">id</span> = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> (<a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(Timer2), <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ab9c91f9699162edb09bb7c90c11c8788">osTimerPeriodic</a>, NULL);</div> <div class="line"> <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a> (<span class="keywordtype">id</span>, 1000UL); <span class="comment">// start timer</span></div> <div class="line"> :</div> <div class="line"> status = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga746b8043d906849bd65e3900fcb483cf">osTimerDelete</a> (<span class="keywordtype">id</span>); <span class="comment">// stop and delete timer</span></div> <div class="line"> <span class="keywordflow">if</span> (status != <a class="code" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99ea9e1c9e2550bb4de8969a935acffc968f">osOK</a>) {</div> <div class="line"> <span class="comment">// Timer could not be deleted</span></div> <div class="line"> } </div> <div class="line"> :</div> <div class="line">}</div> </div><!-- fragment --> </div> </div> <a class="anchor" id="ga27a797a401b068e2644d1125f22a07ca"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osTimerStart </td> <td>(</td> <td class="paramtype"><a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> </td> <td class="paramname"><em>timer_id</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">uint32_t </td> <td class="paramname"><em>millisec</em> </td> </tr> <tr> <td></td> <td>)</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">timer_id</td><td>timer ID obtained by <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>. </td></tr> <tr><td class="paramdir">[in]</td><td class="paramname">millisec</td><td><a class="el" href="functionOverview.html#CMSIS_RTOS_TimeOutValue">time delay</a> value of the timer. </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> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osTimerStart</b> shall be consistent in every CMSIS-RTOS.</dd></dl> <p>Start or restart the timer.</p> <p><b><a class="el" href="group__CMSIS__RTOS__Status.html">Status and Error Codes</a></b><br/> </p> <ul> <li><em>osOK:</em> the specified timer has been started or restarted.</li> <li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a> cannot be called from interrupt service routines.</li> <li><em>osErrorParameter:</em> <em>timer_id</em> is incorrect.</li> </ul> <dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="functionOverview.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__os_8h.html">cmsis_os.h</a>"</span></div> <div class="line"> </div> <div class="line"><span class="keywordtype">void</span> Time_Callback (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg) { <span class="comment">// timer callback function</span></div> <div class="line"> <span class="comment">// arg contains &exec</span></div> <div class="line"> <span class="comment">// called every second after osTimerStart</span></div> <div class="line">} </div> <div class="line"> </div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a> (Timer, Time_Callback); <span class="comment">// define timer</span></div> <div class="line">uint32_t exec; <span class="comment">// argument for the timer call back function</span></div> <div class="line"> </div> <div class="line"><span class="keywordtype">void</span> TimerStart_example (<span class="keywordtype">void</span>) {</div> <div class="line"> <a class="code" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> id; <span class="comment">// timer id</span></div> <div class="line"> uint32_t timerDelay; <span class="comment">// timer value</span></div> <div class="line"> <a class="code" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> status; <span class="comment">// function return status</span></div> <div class="line"> </div> <div class="line"> <span class="comment">// Create periodic timer</span></div> <div class="line"> exec = 1;</div> <div class="line"> <span class="keywordtype">id</span> = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> (<a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(Timer), <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ab9c91f9699162edb09bb7c90c11c8788">osTimerPeriodic</a>, &exec);</div> <div class="line"> <span class="keywordflow">if</span> (<span class="keywordtype">id</span>) {</div> <div class="line"> timerDelay = 1000;</div> <div class="line"> status = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a> (<span class="keywordtype">id</span>, timerDelay); <span class="comment">// start timer</span></div> <div class="line"> <span class="keywordflow">if</span> (status != <a class="code" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99ea9e1c9e2550bb4de8969a935acffc968f">osOK</a>) {</div> <div class="line"> <span class="comment">// Timer could not be started</span></div> <div class="line"> } </div> <div class="line"> }</div> <div class="line"> :</div> <div class="line">}</div> </div><!-- fragment --> </div> </div> <a class="anchor" id="ga58f36b121a812936435cacc6e1e0e091"></a> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname"><a class="el" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osTimerStop </td> <td>(</td> <td class="paramtype"><a class="el" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> </td> <td class="paramname"><em>timer_id</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">timer_id</td><td>timer ID obtained by <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a>. </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> <dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osTimerStop</b> shall be consistent in every CMSIS-RTOS.</dd></dl> <p>Stop the timer.</p> <p><b><a class="el" href="group__CMSIS__RTOS__Status.html">Status and Error Codes</a></b><br/> </p> <ul> <li><em>osOK:</em> the specified timer has been stopped.</li> <li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga58f36b121a812936435cacc6e1e0e091">osTimerStop</a> cannot be called from interrupt service routines.</li> <li><em>osErrorParameter:</em> <em>timer_id</em> is incorrect.</li> <li><em>osErrorResource:</em> the timer is not started.</li> </ul> <dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="functionOverview.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__os_8h.html">cmsis_os.h</a>"</span></div> <div class="line"> </div> <div class="line"><span class="keywordtype">void</span> Timer_Callback (<span class="keywordtype">void</span> <span class="keyword">const</span> *arg); <span class="comment">// prototype for timer callback function</span></div> <div class="line"><a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1c720627e08d1cc1afcad44e799ed492">osTimerDef</a> (Timer, Timer_Callback); <span class="comment">// define timer</span></div> <div class="line"> </div> <div class="line"><span class="keywordtype">void</span> TimerStop_example (<span class="keywordtype">void</span>) {</div> <div class="line"> <a class="code" href="cmsis__os_8h.html#ab8530dd4273f1f5382187732e14fcaa7">osTimerId</a> id; <span class="comment">// timer id</span></div> <div class="line"> <a class="code" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> status; <span class="comment">// function return status</span></div> <div class="line"> </div> <div class="line"> <span class="comment">// Create periodic timer</span></div> <div class="line"> exec = 1;</div> <div class="line"> <span class="keywordtype">id</span> = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gaedd312bfdca04e0b8162b666e09a1ae6">osTimerCreate</a> (<a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga1b8d670eaf964b2910fa06885e650678">osTimer</a>(Timer2), <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#gadac860eb9e1b4b0619271e6595ed83d9ab9c91f9699162edb09bb7c90c11c8788">osTimerPeriodic</a>, NULL);</div> <div class="line"> <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a> (<span class="keywordtype">id</span>, 1000); <span class="comment">// start timer</span></div> <div class="line"> :</div> <div class="line"> status = <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga58f36b121a812936435cacc6e1e0e091">osTimerStop</a> (<span class="keywordtype">id</span>); <span class="comment">// stop timer</span></div> <div class="line"> <span class="keywordflow">if</span> (status != <a class="code" href="group__CMSIS__RTOS__Status.html#gae2e091fefc4c767117727bd5aba4d99ea9e1c9e2550bb4de8969a935acffc968f">osOK</a>) {</div> <div class="line"> <span class="comment">// Timer could not be stopped</span></div> <div class="line"> } </div> <div class="line"> :</div> <div class="line"> <a class="code" href="group__CMSIS__RTOS__TimerMgmt.html#ga27a797a401b068e2644d1125f22a07ca">osTimerStart</a> (<span class="keywordtype">id</span>, 1000); <span class="comment">// start timer again</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 Feb 8 2017 10:21:02 for CMSIS-RTOS 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>