begriffs open source - cmsis/blob - main/RTOS2/html/group__CMSIS__RTOS__TimerMgmt.html

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 128 <a href="#nested-classes">Data Structures</a> &#124;
 129 <a href="#typedef-members">Typedefs</a> &#124;
 130 <a href="#enum-members">Enumerations</a> &#124;
 131 <a href="#enumval-members">Enumerator</a> &#124;
 132 <a href="#func-members">Functions</a>  </div>
 133   <div class="headertitle"><div class="title">Timer Management<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS API v2</a></div></div></div>
 134 </div><!--header-->
 135 <div class="contents">
 136
 137 <p>Create and control timer and timer callback functions.
 138 <a href="#details">More...</a></p>
 139 <table class="memberdecls">
 140 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="nested-classes" name="nested-classes"></a>
 141 Data Structures</h2></td></tr>
 142 <tr class="memitem:structosTimerAttr__t"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#structosTimerAttr__t">osTimerAttr_t</a></td></tr>
 143 <tr class="memdesc:structosTimerAttr__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">Attributes structure for timer.  <a href="group__CMSIS__RTOS__TimerMgmt.html#structosTimerAttr__t">More...</a><br /></td></tr>
 144 <tr class="separator:structosTimerAttr__t"><td class="memSeparator" colspan="2">&#160;</td></tr>
 145 </table><table class="memberdecls">
 146 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="typedef-members" name="typedef-members"></a>
 147 Typedefs</h2></td></tr>
 148 <tr class="memitem:gaad5409379689ee27bb0a0b56ea4a4b34"><td class="memItemLeft" align="right" valign="top">typedef void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a></td></tr>
 149 <tr class="separator:gaad5409379689ee27bb0a0b56ea4a4b34"><td class="memSeparator" colspan="2">&#160;</td></tr>
 150 <tr class="memitem:gaacf768c1ec64b020598afb985d7b30be"><td class="memItemLeft" align="right" valign="top">typedef void(*&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaacf768c1ec64b020598afb985d7b30be">osTimerFunc_t</a>) (void *argument)</td></tr>
 151 <tr class="memdesc:gaacf768c1ec64b020598afb985d7b30be"><td class="mdescLeft">&#160;</td><td class="mdescRight">Timer callback function.  <br /></td></tr>
 152 <tr class="separator:gaacf768c1ec64b020598afb985d7b30be"><td class="memSeparator" colspan="2">&#160;</td></tr>
 153 </table><table class="memberdecls">
 154 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="enum-members" name="enum-members"></a>
 155 Enumerations</h2></td></tr>
 156 <tr class="memitem:ga7dc24a4c2b90334427081c3da7a71915"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">osTimerType_t</a> { <br />
 157 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb">osTimerOnce</a> = 0
 158 , <br />
 159 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a> = 1
 160 <br />
 161  }</td></tr>
 162 <tr class="memdesc:ga7dc24a4c2b90334427081c3da7a71915"><td class="mdescLeft">&#160;</td><td class="mdescRight">Timer type.  <a href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">More...</a><br /></td></tr>
 163 <tr class="separator:ga7dc24a4c2b90334427081c3da7a71915"><td class="memSeparator" colspan="2">&#160;</td></tr>
 164 </table><table class="memberdecls">
 165 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
 166 Functions</h2></td></tr>
 167 <tr class="memitem:gad4e7f785c5f700a509f55a3bf6a62bec"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a> (<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaacf768c1ec64b020598afb985d7b30be">osTimerFunc_t</a> func, <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">osTimerType_t</a> type, void *argument, const <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#structosTimerAttr__t">osTimerAttr_t</a> *attr)</td></tr>
 168 <tr class="memdesc:gad4e7f785c5f700a509f55a3bf6a62bec"><td class="mdescLeft">&#160;</td><td class="mdescRight">Create and Initialize a timer.  <br /></td></tr>
 169 <tr class="separator:gad4e7f785c5f700a509f55a3bf6a62bec"><td class="memSeparator" colspan="2">&#160;</td></tr>
 170 <tr class="memitem:ga4f82a98eee4d9ea79507e44340d3d319"><td class="memItemLeft" align="right" valign="top">const char *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga4f82a98eee4d9ea79507e44340d3d319">osTimerGetName</a> (<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> timer_id)</td></tr>
 171 <tr class="memdesc:ga4f82a98eee4d9ea79507e44340d3d319"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get name of a timer.  <br /></td></tr>
 172 <tr class="separator:ga4f82a98eee4d9ea79507e44340d3d319"><td class="memSeparator" colspan="2">&#160;</td></tr>
 173 <tr class="memitem:gab6ee2859ea657641b7adfac599b8121d"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a> (<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> timer_id, uint32_t ticks)</td></tr>
 174 <tr class="memdesc:gab6ee2859ea657641b7adfac599b8121d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Start or restart a timer.  <br /></td></tr>
 175 <tr class="separator:gab6ee2859ea657641b7adfac599b8121d"><td class="memSeparator" colspan="2">&#160;</td></tr>
 176 <tr class="memitem:gabd7a89356da7717293eb0bc5d87b8ac9"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gabd7a89356da7717293eb0bc5d87b8ac9">osTimerStop</a> (<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> timer_id)</td></tr>
 177 <tr class="memdesc:gabd7a89356da7717293eb0bc5d87b8ac9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Stop a timer.  <br /></td></tr>
 178 <tr class="separator:gabd7a89356da7717293eb0bc5d87b8ac9"><td class="memSeparator" colspan="2">&#160;</td></tr>
 179 <tr class="memitem:ga69d3589f54194022c30dd01e45ec6741"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga69d3589f54194022c30dd01e45ec6741">osTimerIsRunning</a> (<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> timer_id)</td></tr>
 180 <tr class="memdesc:ga69d3589f54194022c30dd01e45ec6741"><td class="mdescLeft">&#160;</td><td class="mdescRight">Check if a timer is running.  <br /></td></tr>
 181 <tr class="separator:ga69d3589f54194022c30dd01e45ec6741"><td class="memSeparator" colspan="2">&#160;</td></tr>
 182 <tr class="memitem:gad0001dd74721ab461789324806db2453"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453">osTimerDelete</a> (<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> timer_id)</td></tr>
 183 <tr class="memdesc:gad0001dd74721ab461789324806db2453"><td class="mdescLeft">&#160;</td><td class="mdescRight">Delete a timer.  <br /></td></tr>
 184 <tr class="separator:gad0001dd74721ab461789324806db2453"><td class="memSeparator" colspan="2">&#160;</td></tr>
 185 </table>
 186 <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
 187 <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. 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#gad0001dd74721ab461789324806db2453">deleted</a> or <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gabd7a89356da7717293eb0bc5d87b8ac9">stopped</a>. All timers can be <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">started, restarted</a>, or <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gabd7a89356da7717293eb0bc5d87b8ac9">stopped</a>.</p>
 188 <dl class="section note"><dt>Note</dt><dd>RTX handles Timers in the thread <b>osRtxTimerThread</b>. Callback functions run under control of this thread and may use other CMSIS-RTOS API calls. The <b>osRtxTimerThread</b> is configured in timerConfig. </dd>
 189 <dd>
 190 Timer management functions cannot be called from Interrupt Service Routines.</dd></dl>
 191 <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>
 192 <div class="image">
 193 <img src="Timer.png" alt=""/>
 194 <div class="caption">
 195 Behavior of a Periodic Timer</div></div>
 196 <h2><a class="anchor" id="autotoc_md3"></a>
 197 Working with Timers</h2>
 198 <p>The following steps are required to use a software timer:</p><ol type="1">
 199 <li>Define the timers: <div class="fragment"><div class="line"><a class="code hl_typedef" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> one_shot_id, periodic_id;</div>
 200 <div class="ttc" id="agroup__CMSIS__RTOS__TimerMgmt_html_gaad5409379689ee27bb0a0b56ea4a4b34"><div class="ttname"><a href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a></div><div class="ttdeci">void * osTimerId_t</div><div class="ttdef"><b>Definition:</b> cmsis_os2.h:256</div></div>
 201 </div><!-- fragment --></li>
 202 <li>Define callback functions: <div class="fragment"><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> one_shot_Callback (<span class="keywordtype">void</span> *argument) {</div>
 203 <div class="line">  int32_t arg = (int32_t)argument; <span class="comment">// cast back argument &#39;0&#39; </span></div>
 204 <div class="line">  <span class="comment">// do something, i.e. set thread/event flags</span></div>
 205 <div class="line">}</div>
 206 <div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> periodic_Callback (<span class="keywordtype">void</span> *argument) {</div>
 207 <div class="line">  int32_t arg = (int32_t)argument; <span class="comment">// cast back argument &#39;5&#39;</span></div>
 208 <div class="line">  <span class="comment">// do something, i.e. set thread/event flags</span></div>
 209 <div class="line">}</div>
 210 </div><!-- fragment --></li>
 211 <li>Instantiate and start the timers: <div class="fragment"><div class="line"><span class="comment">// creates a one-shot timer:</span></div>
 212 <div class="line">one_shot_id = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>(one_shot_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb">osTimerOnce</a>, (<span class="keywordtype">void</span> *)0, NULL);     <span class="comment">// (void*)0 is passed as an argument</span></div>
 213 <div class="line">                                                                               <span class="comment">// to the callback function</span></div>
 214 <div class="line"><span class="comment">// creates a periodic timer:</span></div>
 215 <div class="line">periodic_id = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>(periodic_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a>, (<span class="keywordtype">void</span> *)5, NULL); <span class="comment">// (void*)5 is passed as an argument</span></div>
 216 <div class="line">                                                                               <span class="comment">// to the callback function</span></div>
 217 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>(one_shot_id, 500U);</div>
 218 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>(periodic_id, 1500U);</div>
 219 <div class="line"> </div>
 220 <div class="line"><span class="comment">// start the one-shot timer again after it has triggered the first time:</span></div>
 221 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>(one_shot_id, 500U);</div>
 222 <div class="line"> </div>
 223 <div class="line"><span class="comment">// when timers are not needed any longer free the resources:</span></div>
 224 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453">osTimerDelete</a>(one_shot_id);</div>
 225 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453">osTimerDelete</a>(periodic_id);</div>
 226 <div class="ttc" id="agroup__CMSIS__RTOS__TimerMgmt_html_gab6ee2859ea657641b7adfac599b8121d"><div class="ttname"><a href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a></div><div class="ttdeci">osStatus_t osTimerStart(osTimerId_t timer_id, uint32_t ticks)</div><div class="ttdoc">Start or restart a timer.</div></div>
 227 <div class="ttc" id="agroup__CMSIS__RTOS__TimerMgmt_html_gad0001dd74721ab461789324806db2453"><div class="ttname"><a href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453">osTimerDelete</a></div><div class="ttdeci">osStatus_t osTimerDelete(osTimerId_t timer_id)</div><div class="ttdoc">Delete a timer.</div></div>
 228 <div class="ttc" id="agroup__CMSIS__RTOS__TimerMgmt_html_gad4e7f785c5f700a509f55a3bf6a62bec"><div class="ttname"><a href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a></div><div class="ttdeci">osTimerId_t osTimerNew(osTimerFunc_t func, osTimerType_t type, void *argument, const osTimerAttr_t *attr)</div><div class="ttdoc">Create and Initialize a timer.</div></div>
 229 <div class="ttc" id="agroup__CMSIS__RTOS__TimerMgmt_html_gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb"><div class="ttname"><a href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb">osTimerOnce</a></div><div class="ttdeci">@ osTimerOnce</div><div class="ttdoc">One-shot timer.</div><div class="ttdef"><b>Definition:</b> cmsis_os2.h:184</div></div>
 230 <div class="ttc" id="agroup__CMSIS__RTOS__TimerMgmt_html_gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35"><div class="ttname"><a href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a></div><div class="ttdeci">@ osTimerPeriodic</div><div class="ttdoc">Repeating timer.</div><div class="ttdef"><b>Definition:</b> cmsis_os2.h:185</div></div>
 231 </div><!-- fragment --> </li>
 232 </ol>
 233 <hr/><h2 class="groupheader">Data Structure Documentation</h2>
 234 <a name="structosTimerAttr__t" id="structosTimerAttr__t"></a>
 235 <h2 class="memtitle"><span class="permalink"><a href="#structosTimerAttr__t">&#9670;&#160;</a></span>osTimerAttr_t</h2>
 236
 237 <div class="memitem">
 238 <div class="memproto">
 239       <table class="memname">
 240         <tr>
 241           <td class="memname">struct osTimerAttr_t</td>
 242         </tr>
 243       </table>
 244 </div><div class="memdoc">
 245 <div class="textblock"><p>Specifies the following attributes for the <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a> function. </p>
 246 </div><table class="fieldtable">
 247 <tr><th colspan="3">Data Fields</th></tr>
 248 <tr><td class="fieldtype">
 249 <a id="ab74e6bf80237ddc4109968cedc58c151" name="ab74e6bf80237ddc4109968cedc58c151"></a>const char *</td>
 250 <td class="fieldname">
 251 name</td>
 252 <td class="fielddoc">
 253 name of the timer <p>Pointer to a constant string with a human readable name (displayed during debugging) of the timer object.</p>
 254 <p>Default: <span class="XML-Token">NULL</span> no name specified. </p>
 255 </td></tr>
 256 <tr><td class="fieldtype">
 257 <a id="a6e93b49cb79c12f768d72580c7731f30" name="a6e93b49cb79c12f768d72580c7731f30"></a>uint32_t</td>
 258 <td class="fieldname">
 259 attr_bits</td>
 260 <td class="fielddoc">
 261 attribute bits <p>Reserved for future use (must be set to '0' for future compatibility). </p>
 262 </td></tr>
 263 <tr><td class="fieldtype">
 264 <a id="a1e100dc33d403841ed3c344e3397868e" name="a1e100dc33d403841ed3c344e3397868e"></a>void *</td>
 265 <td class="fieldname">
 266 cb_mem</td>
 267 <td class="fielddoc">
 268 memory for control block <p>Pointer to a memory for the timer control block object. Refer to StaticObjectMemory for more information.</p>
 269 <p>Default: <span class="XML-Token">NULL</span> to use <a class="el" href="group__CMSIS__RTOS__MemoryMgmt.html#CMSIS_RTOS_MemoryMgmt_Automatic">Automatic Dynamic Allocation</a> for the timer control block. </p>
 270 </td></tr>
 271 <tr><td class="fieldtype">
 272 <a id="aa55a4335d12dc2785dc00fdc292d1159" name="aa55a4335d12dc2785dc00fdc292d1159"></a>uint32_t</td>
 273 <td class="fieldname">
 274 cb_size</td>
 275 <td class="fielddoc">
 276 size of provided memory for control block <p>The size (in bytes) of memory block passed with <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#a1e100dc33d403841ed3c344e3397868e">cb_mem</a>. For RTX, the minimum value is defined with osRtxTimerCbSize (higher values are permitted).</p>
 277 <p>Default: <span class="XML-Token">0</span> as the default is no memory provided with <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#a1e100dc33d403841ed3c344e3397868e">cb_mem</a>. </p>
 278 </td></tr>
 279 </table>
 280
 281 </div>
 282 </div>
 283 <h2 class="groupheader">Typedef Documentation</h2>
 284 <a id="gaad5409379689ee27bb0a0b56ea4a4b34" name="gaad5409379689ee27bb0a0b56ea4a4b34"></a>
 285 <h2 class="memtitle"><span class="permalink"><a href="#gaad5409379689ee27bb0a0b56ea4a4b34">&#9670;&#160;</a></span>osTimerId_t</h2>
 286
 287 <div class="memitem">
 288 <div class="memproto">
 289       <table class="memname">
 290         <tr>
 291           <td class="memname"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a></td>
 292         </tr>
 293       </table>
 294 </div><div class="memdoc">
 295 <p>Timer ID identifies the timer.</p>
 296 <p>Instances of this type hold a reference to a timer object. <br  />
 297 Returned by:</p><ul>
 298 <li><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a> </li>
 299 </ul>
 300
 301 </div>
 302 </div>
 303 <a id="gaacf768c1ec64b020598afb985d7b30be" name="gaacf768c1ec64b020598afb985d7b30be"></a>
 304 <h2 class="memtitle"><span class="permalink"><a href="#gaacf768c1ec64b020598afb985d7b30be">&#9670;&#160;</a></span>osTimerFunc_t</h2>
 305
 306 <div class="memitem">
 307 <div class="memproto">
 308       <table class="memname">
 309         <tr>
 310           <td class="memname">void(* osTimerFunc_t)(void *argument)</td>
 311         </tr>
 312       </table>
 313 </div><div class="memdoc">
 314 <p>The timer callback function is called every time the timer elapses.</p>
 315 <p>The callback might be executed either in a dedicated timer thread or in interrupt context. Thus it is recommended to only use ISR callable functions from the timer callback.</p>
 316 <dl class="params"><dt>Parameters</dt><dd>
 317   <table class="params">
 318     <tr><td class="paramdir">[in]</td><td class="paramname">argument</td><td>The argument provided to <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </td></tr>
 319   </table>
 320   </dd>
 321 </dl>
 322
 323 </div>
 324 </div>
 325 <h2 class="groupheader">Enumeration Type Documentation</h2>
 326 <a id="ga7dc24a4c2b90334427081c3da7a71915" name="ga7dc24a4c2b90334427081c3da7a71915"></a>
 327 <h2 class="memtitle"><span class="permalink"><a href="#ga7dc24a4c2b90334427081c3da7a71915">&#9670;&#160;</a></span>osTimerType_t</h2>
 328
 329 <div class="memitem">
 330 <div class="memproto">
 331       <table class="memname">
 332         <tr>
 333           <td class="memname">enum <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">osTimerType_t</a></td>
 334         </tr>
 335       </table>
 336 </div><div class="memdoc">
 337 <p>The <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">osTimerType_t</a> specifies the a repeating (periodic) or one-shot timer for the function <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </p>
 338 <table class="fieldtable">
 339 <tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb" name="gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb"></a>osTimerOnce&#160;</td><td class="fielddoc"><p>One-shot timer. </p>
 340 <p>The timer is not automatically restarted once it has elapsed. It can be restarted manually using <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a> as needed. </p>
 341 </td></tr>
 342 <tr><td class="fieldname"><a id="gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35" name="gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35"></a>osTimerPeriodic&#160;</td><td class="fielddoc"><p>Repeating timer. </p>
 343 <p>The timer repeats automatically and triggers the callback continuously while running, see <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a> and <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gabd7a89356da7717293eb0bc5d87b8ac9">osTimerStop</a>. </p>
 344 </td></tr>
 345 </table>
 346
 347 </div>
 348 </div>
 349 <h2 class="groupheader">Function Documentation</h2>
 350 <a id="gad4e7f785c5f700a509f55a3bf6a62bec" name="gad4e7f785c5f700a509f55a3bf6a62bec"></a>
 351 <h2 class="memtitle"><span class="permalink"><a href="#gad4e7f785c5f700a509f55a3bf6a62bec">&#9670;&#160;</a></span>osTimerNew()</h2>
 352
 353 <div class="memitem">
 354 <div class="memproto">
 355       <table class="memname">
 356         <tr>
 357           <td class="memname"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> osTimerNew </td>
 358           <td>(</td>
 359           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaacf768c1ec64b020598afb985d7b30be">osTimerFunc_t</a>&#160;</td>
 360           <td class="paramname"><em>func</em>, </td>
 361         </tr>
 362         <tr>
 363           <td class="paramkey"></td>
 364           <td></td>
 365           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">osTimerType_t</a>&#160;</td>
 366           <td class="paramname"><em>type</em>, </td>
 367         </tr>
 368         <tr>
 369           <td class="paramkey"></td>
 370           <td></td>
 371           <td class="paramtype">void *&#160;</td>
 372           <td class="paramname"><em>argument</em>, </td>
 373         </tr>
 374         <tr>
 375           <td class="paramkey"></td>
 376           <td></td>
 377           <td class="paramtype">const <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#structosTimerAttr__t">osTimerAttr_t</a> *&#160;</td>
 378           <td class="paramname"><em>attr</em>&#160;</td>
 379         </tr>
 380         <tr>
 381           <td></td>
 382           <td>)</td>
 383           <td></td><td></td>
 384         </tr>
 385       </table>
 386 </div><div class="memdoc">
 387 <dl class="params"><dt>Parameters</dt><dd>
 388   <table class="params">
 389     <tr><td class="paramdir">[in]</td><td class="paramname">func</td><td>function pointer to callback function. </td></tr>
 390     <tr><td class="paramdir">[in]</td><td class="paramname">type</td><td><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb">osTimerOnce</a> for one-shot or <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a> for periodic behavior. </td></tr>
 391     <tr><td class="paramdir">[in]</td><td class="paramname">argument</td><td>argument to the timer callback function. </td></tr>
 392     <tr><td class="paramdir">[in]</td><td class="paramname">attr</td><td>timer attributes; NULL: default values. </td></tr>
 393   </table>
 394   </dd>
 395 </dl>
 396 <dl class="section return"><dt>Returns</dt><dd>timer ID for reference by other functions or NULL in case of error.</dd></dl>
 397 <p>The function <b>osTimerNew</b> creates an one-shot or periodic timer and associates it with a callback function with <em>argument</em>. The timer is in stopped state until it is started with <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>. The function can be safely called before the RTOS is started (call to <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221">osKernelStart</a>), but not before it is initialized (call to <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659">osKernelInitialize</a>).</p>
 398 <p>The function <b>osTimerNew</b> returns the pointer to the timer object identifier or <span class="XML-Token">NULL</span> in case of an error.</p>
 399 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from Interrupt Service Routines.</dd></dl>
 400 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
 401 <div class="line"> </div>
 402 <div class="line"><span class="keywordtype">void</span> Timer1_Callback (<span class="keywordtype">void</span> *arg);               <span class="comment">// prototypes for timer callback function</span></div>
 403 <div class="line"><span class="keywordtype">void</span> Timer2_Callback (<span class="keywordtype">void</span> *arg);               <span class="comment">// prototypes for timer callback function</span></div>
 404 <div class="line"> </div>
 405 <div class="line">uint32_t exec1;                                 <span class="comment">// argument for the timer call back function</span></div>
 406 <div class="line">uint32_t exec2;                                 <span class="comment">// argument for the timer call back function</span></div>
 407 <div class="line"> </div>
 408 <div class="line"><span class="keywordtype">void</span> TimerCreate_example (<span class="keywordtype">void</span>)  {</div>
 409 <div class="line">  <a class="code hl_typedef" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> id1;                              <span class="comment">// timer id</span></div>
 410 <div class="line">  <a class="code hl_typedef" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> id2;                              <span class="comment">// timer id</span></div>
 411 <div class="line"> </div>
 412 <div class="line">  <span class="comment">// Create one-shoot timer</span></div>
 413 <div class="line">  exec1 = 1U;</div>
 414 <div class="line">  id1 = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>(Timer1_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb">osTimerOnce</a>, &amp;exec1, NULL);</div>
 415 <div class="line">  <span class="keywordflow">if</span> (id1 != NULL) {</div>
 416 <div class="line">    <span class="comment">// One-shoot timer created</span></div>
 417 <div class="line">  }</div>
 418 <div class="line"> </div>
 419 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 420 <div class="line">  exec2 = 2U;</div>
 421 <div class="line">  id2 = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>(Timer2_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a>, &amp;exec2, NULL);</div>
 422 <div class="line">  <span class="keywordflow">if</span> (id2 != NULL) {</div>
 423 <div class="line">    <span class="comment">// Periodic timer created</span></div>
 424 <div class="line">  }</div>
 425 <div class="line">  :</div>
 426 <div class="line">}</div>
 427 <div class="ttc" id="acmsis__os2_8h_html"><div class="ttname"><a href="cmsis__os2_8h.html">cmsis_os2.h</a></div></div>
 428 </div><!-- fragment -->
 429 </div>
 430 </div>
 431 <a id="ga4f82a98eee4d9ea79507e44340d3d319" name="ga4f82a98eee4d9ea79507e44340d3d319"></a>
 432 <h2 class="memtitle"><span class="permalink"><a href="#ga4f82a98eee4d9ea79507e44340d3d319">&#9670;&#160;</a></span>osTimerGetName()</h2>
 433
 434 <div class="memitem">
 435 <div class="memproto">
 436       <table class="memname">
 437         <tr>
 438           <td class="memname">*const char * osTimerGetName </td>
 439           <td>(</td>
 440           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 441           <td class="paramname"><em>timer_id</em></td><td>)</td>
 442           <td></td>
 443         </tr>
 444       </table>
 445 </div><div class="memdoc">
 446 <dl class="params"><dt>Parameters</dt><dd>
 447   <table class="params">
 448     <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#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </td></tr>
 449   </table>
 450   </dd>
 451 </dl>
 452 <dl class="section return"><dt>Returns</dt><dd>name as null-terminated string.</dd></dl>
 453 <p>The function <b>osTimerGetName</b> returns the pointer to the name string of the timer identified by parameter <em>timer_id</em> or <span class="XML-Token">NULL</span> in case of an error.</p>
 454 <dl class="section note"><dt>Note</dt><dd>This function may be called from Interrupt Service Routines. </dd></dl>
 455
 456 </div>
 457 </div>
 458 <a id="gab6ee2859ea657641b7adfac599b8121d" name="gab6ee2859ea657641b7adfac599b8121d"></a>
 459 <h2 class="memtitle"><span class="permalink"><a href="#gab6ee2859ea657641b7adfac599b8121d">&#9670;&#160;</a></span>osTimerStart()</h2>
 460
 461 <div class="memitem">
 462 <div class="memproto">
 463       <table class="memname">
 464         <tr>
 465           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osTimerStart </td>
 466           <td>(</td>
 467           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 468           <td class="paramname"><em>timer_id</em>, </td>
 469         </tr>
 470         <tr>
 471           <td class="paramkey"></td>
 472           <td></td>
 473           <td class="paramtype">uint32_t&#160;</td>
 474           <td class="paramname"><em>ticks</em>&#160;</td>
 475         </tr>
 476         <tr>
 477           <td></td>
 478           <td>)</td>
 479           <td></td><td></td>
 480         </tr>
 481       </table>
 482 </div><div class="memdoc">
 483 <dl class="params"><dt>Parameters</dt><dd>
 484   <table class="params">
 485     <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#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </td></tr>
 486     <tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td>time ticks value of the timer. </td></tr>
 487   </table>
 488   </dd>
 489 </dl>
 490 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 491 <p>The function <b>osTimerStart</b> starts or restarts a timer specified by the parameter <em>timer_id</em>. The parameter <em>ticks</em> specifies the value of the timer in time ticks.</p>
 492 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 493 <li><em>osOK:</em> the specified timer has been started or restarted.</li>
 494 <li><em>osErrorISR:</em> <b>osTimerStart</b> cannot be called from interrupt service routines.</li>
 495 <li><em>osErrorParameter:</em> parameter <em>timer_id</em> is either <span class="XML-Token">NULL</span> or invalid or <em>ticks</em> is incorrect.</li>
 496 <li><em>osErrorResource:</em> the timer is in an invalid state.</li>
 497 <li><em>osErrorSafetyClass:</em> the calling thread safety class is lower than the safety class of the specified timer.</li>
 498 </ul>
 499 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from Interrupt Service Routines.</dd></dl>
 500 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
 501 <div class="line"> </div>
 502 <div class="line"><span class="keywordtype">void</span> Timer_Callback (<span class="keywordtype">void</span> *arg) {               <span class="comment">// timer callback function</span></div>
 503 <div class="line">                                                <span class="comment">// arg contains &amp;exec</span></div>
 504 <div class="line">                                                <span class="comment">// called every second after osTimerStart</span></div>
 505 <div class="line">}</div>
 506 <div class="line"> </div>
 507 <div class="line">uint32_t exec;                                  <span class="comment">// argument for the timer call back function</span></div>
 508 <div class="line"> </div>
 509 <div class="line"><span class="keywordtype">void</span> TimerStart_example (<span class="keywordtype">void</span>) {</div>
 510 <div class="line">  <a class="code hl_typedef" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> id;                               <span class="comment">// timer id</span></div>
 511 <div class="line">  uint32_t    timerDelay;                       <span class="comment">// timer value</span></div>
 512 <div class="line">  <a class="code hl_enumeration" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>  status;                           <span class="comment">// function return status</span></div>
 513 <div class="line"> </div>
 514 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 515 <div class="line">  exec = 1U;</div>
 516 <div class="line">  <span class="keywordtype">id</span> = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>(Timer_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a>, &amp;exec, NULL);</div>
 517 <div class="line">  <span class="keywordflow">if</span> (<span class="keywordtype">id</span> != NULL)  {</div>
 518 <div class="line">    timerDelay = 1000U;</div>
 519 <div class="line">    status = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>(<span class="keywordtype">id</span>, timerDelay);       <span class="comment">// start timer</span></div>
 520 <div class="line">    <span class="keywordflow">if</span> (status != <a class="code hl_enumvalue" href="cmsis__os2_8h.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813ea9e1c9e2550bb4de8969a935acffc968f">osOK</a>) {</div>
 521 <div class="line">      <span class="comment">// Timer could not be started</span></div>
 522 <div class="line">    }</div>
 523 <div class="line">  }</div>
 524 <div class="line">  ;</div>
 525 <div class="line">}</div>
 526 <div class="ttc" id="acmsis__os2_8h_html_ga6c0dbe6069e4e7f47bb4cd32ae2b813ea9e1c9e2550bb4de8969a935acffc968f"><div class="ttname"><a href="cmsis__os2_8h.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813ea9e1c9e2550bb4de8969a935acffc968f">osOK</a></div><div class="ttdeci">@ osOK</div><div class="ttdoc">Operation completed successfully.</div><div class="ttdef"><b>Definition:</b> cmsis_os2.h:240</div></div>
 527 <div class="ttc" id="agroup__CMSIS__RTOS__Definitions_html_ga6c0dbe6069e4e7f47bb4cd32ae2b813e"><div class="ttname"><a href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a></div><div class="ttdeci">osStatus_t</div><div class="ttdoc">Status code values returned by CMSIS-RTOS functions.</div><div class="ttdef"><b>Definition:</b> cmsis_os2.h:239</div></div>
 528 </div><!-- fragment -->
 529 </div>
 530 </div>
 531 <a id="gabd7a89356da7717293eb0bc5d87b8ac9" name="gabd7a89356da7717293eb0bc5d87b8ac9"></a>
 532 <h2 class="memtitle"><span class="permalink"><a href="#gabd7a89356da7717293eb0bc5d87b8ac9">&#9670;&#160;</a></span>osTimerStop()</h2>
 533
 534 <div class="memitem">
 535 <div class="memproto">
 536       <table class="memname">
 537         <tr>
 538           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osTimerStop </td>
 539           <td>(</td>
 540           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 541           <td class="paramname"><em>timer_id</em></td><td>)</td>
 542           <td></td>
 543         </tr>
 544       </table>
 545 </div><div class="memdoc">
 546 <dl class="params"><dt>Parameters</dt><dd>
 547   <table class="params">
 548     <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#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </td></tr>
 549   </table>
 550   </dd>
 551 </dl>
 552 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 553 <p>The function <b>osTimerStop</b> stops a timer specified by the parameter <em>timer_id</em>.</p>
 554 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 555 <li><em>osOK:</em> the specified timer has been stopped.</li>
 556 <li><em>osErrorISR:</em> <b>osTimerStop</b> cannot be called from interrupt service routines.</li>
 557 <li><em>osErrorParameter:</em> parameter <em>timer_id</em> is either <span class="XML-Token">NULL</span> or invalid.</li>
 558 <li><em>osErrorResource:</em> the timer is not running (you can only stop a running timer).</li>
 559 <li><em>osErrorSafetyClass:</em> the calling thread safety class is lower than the safety class of the specified timer.</li>
 560 </ul>
 561 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from Interrupt Service Routines.</dd></dl>
 562 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
 563 <div class="line"> </div>
 564 <div class="line"><span class="keywordtype">void</span> Timer_Callback (<span class="keywordtype">void</span> *arg);                <span class="comment">// prototype for timer callback function</span></div>
 565 <div class="line"> </div>
 566 <div class="line">uint32_t exec;                                  <span class="comment">// argument for the timer call back function</span></div>
 567 <div class="line"> </div>
 568 <div class="line"><span class="keywordtype">void</span> TimerStop_example (<span class="keywordtype">void</span>) {</div>
 569 <div class="line">  <a class="code hl_typedef" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> id;                               <span class="comment">// timer id</span></div>
 570 <div class="line">  <a class="code hl_enumeration" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>  status;                           <span class="comment">// function return status</span></div>
 571 <div class="line"> </div>
 572 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 573 <div class="line">  exec = 1U;</div>
 574 <div class="line">  <span class="keywordtype">id</span> = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>(Timer_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a>, &amp;exec, NULL);</div>
 575 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>(<span class="keywordtype">id</span>, 1000U);                      <span class="comment">// start timer</span></div>
 576 <div class="line">  :</div>
 577 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gabd7a89356da7717293eb0bc5d87b8ac9">osTimerStop</a>(<span class="keywordtype">id</span>);                     <span class="comment">// stop timer</span></div>
 578 <div class="line">  <span class="keywordflow">if</span> (status != <a class="code hl_enumvalue" href="cmsis__os2_8h.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813ea9e1c9e2550bb4de8969a935acffc968f">osOK</a>) {</div>
 579 <div class="line">    <span class="comment">// Timer could not be stopped</span></div>
 580 <div class="line">  }</div>
 581 <div class="line">  ;</div>
 582 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>(<span class="keywordtype">id</span>, 1000U);                      <span class="comment">// start timer again</span></div>
 583 <div class="line">  ;</div>
 584 <div class="line">}</div>
 585 <div class="ttc" id="agroup__CMSIS__RTOS__TimerMgmt_html_gabd7a89356da7717293eb0bc5d87b8ac9"><div class="ttname"><a href="group__CMSIS__RTOS__TimerMgmt.html#gabd7a89356da7717293eb0bc5d87b8ac9">osTimerStop</a></div><div class="ttdeci">osStatus_t osTimerStop(osTimerId_t timer_id)</div><div class="ttdoc">Stop a timer.</div></div>
 586 </div><!-- fragment -->
 587 </div>
 588 </div>
 589 <a id="ga69d3589f54194022c30dd01e45ec6741" name="ga69d3589f54194022c30dd01e45ec6741"></a>
 590 <h2 class="memtitle"><span class="permalink"><a href="#ga69d3589f54194022c30dd01e45ec6741">&#9670;&#160;</a></span>osTimerIsRunning()</h2>
 591
 592 <div class="memitem">
 593 <div class="memproto">
 594       <table class="memname">
 595         <tr>
 596           <td class="memname">uint32_t osTimerIsRunning </td>
 597           <td>(</td>
 598           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 599           <td class="paramname"><em>timer_id</em></td><td>)</td>
 600           <td></td>
 601         </tr>
 602       </table>
 603 </div><div class="memdoc">
 604 <dl class="params"><dt>Parameters</dt><dd>
 605   <table class="params">
 606     <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#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </td></tr>
 607   </table>
 608   </dd>
 609 </dl>
 610 <dl class="section return"><dt>Returns</dt><dd>0 not running, 1 running.</dd></dl>
 611 <p>The function <b>osTimerIsRunning</b> checks whether a timer specified by parameter <em>timer_id</em> is running. It returns <span class="XML-Token">1</span> if the timer is running and <span class="XML-Token">0</span> if the timer is stopped or an error occurred.</p>
 612 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from Interrupt Service Routines. </dd></dl>
 613
 614 </div>
 615 </div>
 616 <a id="gad0001dd74721ab461789324806db2453" name="gad0001dd74721ab461789324806db2453"></a>
 617 <h2 class="memtitle"><span class="permalink"><a href="#gad0001dd74721ab461789324806db2453">&#9670;&#160;</a></span>osTimerDelete()</h2>
 618
 619 <div class="memitem">
 620 <div class="memproto">
 621       <table class="memname">
 622         <tr>
 623           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osTimerDelete </td>
 624           <td>(</td>
 625           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 626           <td class="paramname"><em>timer_id</em></td><td>)</td>
 627           <td></td>
 628         </tr>
 629       </table>
 630 </div><div class="memdoc">
 631 <dl class="params"><dt>Parameters</dt><dd>
 632   <table class="params">
 633     <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#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </td></tr>
 634   </table>
 635   </dd>
 636 </dl>
 637 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 638 <p>The function <b>osTimerDelete</b> deletes the timer specified by parameter <em>timer_id</em>.</p>
 639 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 640 <li><em>osOK:</em> the specified timer has been deleted.</li>
 641 <li><em>osErrorISR:</em> <b>osTimerDelete</b> cannot be called from interrupt service routines.</li>
 642 <li><em>osErrorParameter:</em> parameter <em>timer_id</em> is either <span class="XML-Token">NULL</span> or invalid.</li>
 643 <li><em>osErrorResource:</em> the timer is in an invalid state.</li>
 644 <li><em>osErrorSafetyClass:</em> the calling thread safety class is lower than the safety class of the specified timer.</li>
 645 </ul>
 646 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from Interrupt Service Routines.</dd></dl>
 647 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
 648 <div class="line"> </div>
 649 <div class="line"><span class="keywordtype">void</span> Timer_Callback (<span class="keywordtype">void</span> *arg);                <span class="comment">// prototype for timer callback function</span></div>
 650 <div class="line"> </div>
 651 <div class="line">uint32_t exec;                                  <span class="comment">// argument for the timer call back function</span></div>
 652 <div class="line"> </div>
 653 <div class="line"><span class="keywordtype">void</span> TimerDelete_example (<span class="keywordtype">void</span>) {</div>
 654 <div class="line">  <a class="code hl_typedef" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> id;                               <span class="comment">// timer id</span></div>
 655 <div class="line">  <a class="code hl_enumeration" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>  status;                           <span class="comment">// function return status  </span></div>
 656 <div class="line"> </div>
 657 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 658 <div class="line">  exec = 1U;</div>
 659 <div class="line">  <span class="keywordtype">id</span> = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>(Timer_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a>, &amp;exec, NULL);</div>
 660 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d">osTimerStart</a>(<span class="keywordtype">id</span>, 1000U);                      <span class="comment">// start timer</span></div>
 661 <div class="line">  ;</div>
 662 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453">osTimerDelete</a>(<span class="keywordtype">id</span>);                   <span class="comment">// stop and delete timer</span></div>
 663 <div class="line">  <span class="keywordflow">if</span> (status != <a class="code hl_enumvalue" href="cmsis__os2_8h.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813ea9e1c9e2550bb4de8969a935acffc968f">osOK</a>) {</div>
 664 <div class="line">    <span class="comment">// Timer could not be deleted</span></div>
 665 <div class="line">  } </div>
 666 <div class="line">  ;</div>
 667 <div class="line">}</div>
 668 </div><!-- fragment -->
 669 </div>
 670 </div>
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