begriffs open source - cmsis/blob - dev/v6.0.0-dev53/RTOS2/html/group__CMSIS__RTOS__TimerMgmt.html

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 131 <a href="#nested-classes">Data Structures</a> &#124;
 132 <a href="#typedef-members">Typedefs</a> &#124;
 133 <a href="#enum-members">Enumerations</a> &#124;
 134 <a href="#func-members">Functions</a> &#124;
 135 <a href="#var-members">Variables</a>  </div>
 136   <div class="headertitle"><div class="title">Timer Management<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS2 API</a></div></div></div>
 137 </div><!--header-->
 138 <div class="contents">
 139
 140 <p>Create and control timer and timer callback functions.
 141 <a href="#details">More...</a></p>
 142 <table class="memberdecls">
 143 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="nested-classes" name="nested-classes"></a>
 144 Data Structures</h2></td></tr>
 145 <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>
 146 <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>
 147 <tr class="separator:structosTimerAttr__t"><td class="memSeparator" colspan="2">&#160;</td></tr>
 148 </table><table class="memberdecls">
 149 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="typedef-members" name="typedef-members"></a>
 150 Typedefs</h2></td></tr>
 151 <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>
 152 <tr class="separator:gaad5409379689ee27bb0a0b56ea4a4b34"><td class="memSeparator" colspan="2">&#160;</td></tr>
 153 <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>
 154 <tr class="memdesc:gaacf768c1ec64b020598afb985d7b30be"><td class="mdescLeft">&#160;</td><td class="mdescRight">Timer callback function.  <br /></td></tr>
 155 <tr class="separator:gaacf768c1ec64b020598afb985d7b30be"><td class="memSeparator" colspan="2">&#160;</td></tr>
 156 </table><table class="memberdecls">
 157 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="enum-members" name="enum-members"></a>
 158 Enumerations</h2></td></tr>
 159 <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 />
 160 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb">osTimerOnce</a> = 0
 161 , <br />
 162 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35">osTimerPeriodic</a> = 1
 163 <br />
 164  }</td></tr>
 165 <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>
 166 <tr class="separator:ga7dc24a4c2b90334427081c3da7a71915"><td class="memSeparator" colspan="2">&#160;</td></tr>
 167 </table><table class="memberdecls">
 168 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
 169 Functions</h2></td></tr>
 170 <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>
 171 <tr class="memdesc:gad4e7f785c5f700a509f55a3bf6a62bec"><td class="mdescLeft">&#160;</td><td class="mdescRight">Create and Initialize a timer.  <br /></td></tr>
 172 <tr class="separator:gad4e7f785c5f700a509f55a3bf6a62bec"><td class="memSeparator" colspan="2">&#160;</td></tr>
 173 <tr class="memitem:ga7938dde88ada1a01b60f41cf120069c0"><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#ga7938dde88ada1a01b60f41cf120069c0">osTimerGetName</a> (<a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> timer_id)</td></tr>
 174 <tr class="memdesc:ga7938dde88ada1a01b60f41cf120069c0"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get name of a timer.  <br /></td></tr>
 175 <tr class="separator:ga7938dde88ada1a01b60f41cf120069c0"><td class="memSeparator" colspan="2">&#160;</td></tr>
 176 <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>
 177 <tr class="memdesc:gab6ee2859ea657641b7adfac599b8121d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Start or restart a timer.  <br /></td></tr>
 178 <tr class="separator:gab6ee2859ea657641b7adfac599b8121d"><td class="memSeparator" colspan="2">&#160;</td></tr>
 179 <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>
 180 <tr class="memdesc:gabd7a89356da7717293eb0bc5d87b8ac9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Stop a timer.  <br /></td></tr>
 181 <tr class="separator:gabd7a89356da7717293eb0bc5d87b8ac9"><td class="memSeparator" colspan="2">&#160;</td></tr>
 182 <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>
 183 <tr class="memdesc:ga69d3589f54194022c30dd01e45ec6741"><td class="mdescLeft">&#160;</td><td class="mdescRight">Check if a timer is running.  <br /></td></tr>
 184 <tr class="separator:ga69d3589f54194022c30dd01e45ec6741"><td class="memSeparator" colspan="2">&#160;</td></tr>
 185 <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>
 186 <tr class="memdesc:gad0001dd74721ab461789324806db2453"><td class="mdescLeft">&#160;</td><td class="mdescRight">Delete a timer.  <br /></td></tr>
 187 <tr class="separator:gad0001dd74721ab461789324806db2453"><td class="memSeparator" colspan="2">&#160;</td></tr>
 188 </table><table class="memberdecls">
 189 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="var-members" name="var-members"></a>
 190 Variables</h2></td></tr>
 191 <tr class="memitem:ga6e93b49cb79c12f768d72580c7731f30"><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#ga6e93b49cb79c12f768d72580c7731f30">attr_bits</a></td></tr>
 192 <tr class="memdesc:ga6e93b49cb79c12f768d72580c7731f30"><td class="mdescLeft">&#160;</td><td class="mdescRight">attribute bits  <br /></td></tr>
 193 <tr class="separator:ga6e93b49cb79c12f768d72580c7731f30"><td class="memSeparator" colspan="2">&#160;</td></tr>
 194 <tr class="memitem:ga1e100dc33d403841ed3c344e3397868e"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga1e100dc33d403841ed3c344e3397868e">cb_mem</a></td></tr>
 195 <tr class="memdesc:ga1e100dc33d403841ed3c344e3397868e"><td class="mdescLeft">&#160;</td><td class="mdescRight">memory for control block  <br /></td></tr>
 196 <tr class="separator:ga1e100dc33d403841ed3c344e3397868e"><td class="memSeparator" colspan="2">&#160;</td></tr>
 197 <tr class="memitem:gaa55a4335d12dc2785dc00fdc292d1159"><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#gaa55a4335d12dc2785dc00fdc292d1159">cb_size</a></td></tr>
 198 <tr class="memdesc:gaa55a4335d12dc2785dc00fdc292d1159"><td class="mdescLeft">&#160;</td><td class="mdescRight">size of provided memory for control block  <br /></td></tr>
 199 <tr class="separator:gaa55a4335d12dc2785dc00fdc292d1159"><td class="memSeparator" colspan="2">&#160;</td></tr>
 200 <tr class="memitem:gab74e6bf80237ddc4109968cedc58c151"><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#gab74e6bf80237ddc4109968cedc58c151">name</a></td></tr>
 201 <tr class="memdesc:gab74e6bf80237ddc4109968cedc58c151"><td class="mdescLeft">&#160;</td><td class="mdescRight">name of the timer  <br /></td></tr>
 202 <tr class="separator:gab74e6bf80237ddc4109968cedc58c151"><td class="memSeparator" colspan="2">&#160;</td></tr>
 203 </table>
 204 <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
 205 <p>Create and control timer and timer callback functions. </p>
 206 <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>
 207 <dl class="section note"><dt>Note</dt><dd>Timer management functions cannot be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
 208 <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>
 209 <div class="image">
 210 <img src="Timer.png" alt=""/>
 211 <div class="caption">
 212 Behavior of a Periodic Timer</div></div>
 213 <h2><a class="anchor" id="autotoc_md4"></a>
 214 Working with Timers</h2>
 215 <p>The following steps are required to use a software timer:</p><ol type="1">
 216 <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>
 217 </div><!-- fragment --></li>
 218 <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>
 219 <div class="line">  int32_t arg = (int32_t)argument; <span class="comment">// cast back argument &#39;0&#39; </span></div>
 220 <div class="line">  <span class="comment">// do something, i.e. set thread/event flags</span></div>
 221 <div class="line">}</div>
 222 <div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> periodic_Callback (<span class="keywordtype">void</span> *argument) {</div>
 223 <div class="line">  int32_t arg = (int32_t)argument; <span class="comment">// cast back argument &#39;5&#39;</span></div>
 224 <div class="line">  <span class="comment">// do something, i.e. set thread/event flags</span></div>
 225 <div class="line">}</div>
 226 </div><!-- fragment --></li>
 227 <li>Instantiate and start the timers: <div class="fragment"><div class="line"><span class="comment">// creates a one-shot timer:</span></div>
 228 <div class="line">one_shot_id = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec" title="Create and Initialize a timer.">osTimerNew</a>(one_shot_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb" title="One-shot timer.">osTimerOnce</a>, (<span class="keywordtype">void</span> *)0, NULL);     <span class="comment">// (void*)0 is passed as an argument</span></div>
 229 <div class="line">                                                                               <span class="comment">// to the callback function</span></div>
 230 <div class="line"><span class="comment">// creates a periodic timer:</span></div>
 231 <div class="line">periodic_id = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec" title="Create and Initialize a timer.">osTimerNew</a>(periodic_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35" title="Repeating timer.">osTimerPeriodic</a>, (<span class="keywordtype">void</span> *)5, NULL); <span class="comment">// (void*)5 is passed as an argument</span></div>
 232 <div class="line">                                                                               <span class="comment">// to the callback function</span></div>
 233 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d" title="Start or restart a timer.">osTimerStart</a>(one_shot_id, 500U);</div>
 234 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d" title="Start or restart a timer.">osTimerStart</a>(periodic_id, 1500U);</div>
 235 <div class="line"> </div>
 236 <div class="line"><span class="comment">// start the one-shot timer again after it has triggered the first time:</span></div>
 237 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d" title="Start or restart a timer.">osTimerStart</a>(one_shot_id, 500U);</div>
 238 <div class="line"> </div>
 239 <div class="line"><span class="comment">// when timers are not needed any longer free the resources:</span></div>
 240 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453" title="Delete a timer.">osTimerDelete</a>(one_shot_id);</div>
 241 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453" title="Delete a timer.">osTimerDelete</a>(periodic_id);</div>
 242 </div><!-- fragment --> </li>
 243 </ol>
 244 <hr/><h2 class="groupheader">Data Structure Documentation</h2>
 245 <a name="structosTimerAttr__t" id="structosTimerAttr__t"></a>
 246 <h2 class="memtitle"><span class="permalink"><a href="#structosTimerAttr__t">&#9670;&#160;</a></span>osTimerAttr_t</h2>
 247
 248 <div class="memitem">
 249 <div class="memproto">
 250       <table class="memname">
 251         <tr>
 252           <td class="memname">struct osTimerAttr_t</td>
 253         </tr>
 254       </table>
 255 </div><div class="memdoc">
 256 <div class="textblock"><p>Attributes structure for timer. </p>
 257 <p>Specifies the following attributes for the <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a> function. </p>
 258 </div><table class="fieldtable">
 259 <tr><th colspan="3">Data Fields</th></tr>
 260 <tr><td class="fieldtype">
 261 <a id="gab74e6bf80237ddc4109968cedc58c151" name="gab74e6bf80237ddc4109968cedc58c151"></a>const char *</td>
 262 <td class="fieldname">
 263 name</td>
 264 <td class="fielddoc">
 265 name of the timer <p>Pointer to a constant string with a human readable name (displayed during debugging) of the timer object.</p>
 266 <p>Default: <span class="XML-Token">NULL</span> no name specified. </p>
 267 </td></tr>
 268 <tr><td class="fieldtype">
 269 <a id="ga6e93b49cb79c12f768d72580c7731f30" name="ga6e93b49cb79c12f768d72580c7731f30"></a>uint32_t</td>
 270 <td class="fieldname">
 271 attr_bits</td>
 272 <td class="fielddoc">
 273 attribute bits <p>Reserved for future use (must be set to '0' for future compatibility). </p>
 274 </td></tr>
 275 <tr><td class="fieldtype">
 276 <a id="ga1e100dc33d403841ed3c344e3397868e" name="ga1e100dc33d403841ed3c344e3397868e"></a>void *</td>
 277 <td class="fieldname">
 278 cb_mem</td>
 279 <td class="fielddoc">
 280 memory for control block <p>Pointer to a memory for the timer control block object. Refer to <a class="el" href="usingOS2.html#CMSIS_RTOS_MemoryMgmt_Manual">Manual User-defined Allocation</a> for more information.</p>
 281 <p>Default: <span class="XML-Token">NULL</span> to use <a class="el" href="usingOS2.html#CMSIS_RTOS_MemoryMgmt_Automatic">Automatic Dynamic Allocation</a> for the timer control block. </p>
 282 </td></tr>
 283 <tr><td class="fieldtype">
 284 <a id="gaa55a4335d12dc2785dc00fdc292d1159" name="gaa55a4335d12dc2785dc00fdc292d1159"></a>uint32_t</td>
 285 <td class="fieldname">
 286 cb_size</td>
 287 <td class="fielddoc">
 288 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#ga1e100dc33d403841ed3c344e3397868e">cb_mem</a>. Required value depends on the underlying kernel implementation.</p>
 289 <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#ga1e100dc33d403841ed3c344e3397868e">cb_mem</a>. </p>
 290 </td></tr>
 291 </table>
 292
 293 </div>
 294 </div>
 295 <h2 class="groupheader">Typedef Documentation</h2>
 296 <a id="gaad5409379689ee27bb0a0b56ea4a4b34" name="gaad5409379689ee27bb0a0b56ea4a4b34"></a>
 297 <h2 class="memtitle"><span class="permalink"><a href="#gaad5409379689ee27bb0a0b56ea4a4b34">&#9670;&#160;</a></span>osTimerId_t</h2>
 298
 299 <div class="memitem">
 300 <div class="memproto">
 301       <table class="memname">
 302         <tr>
 303           <td class="memname"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a></td>
 304         </tr>
 305       </table>
 306 </div><div class="memdoc">
 307 <p>Timer ID identifies the timer.</p>
 308 <p>Instances of this type hold a reference to a timer object. <br  />
 309 Returned by:</p><ul>
 310 <li><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a> </li>
 311 </ul>
 312
 313 </div>
 314 </div>
 315 <a id="gaacf768c1ec64b020598afb985d7b30be" name="gaacf768c1ec64b020598afb985d7b30be"></a>
 316 <h2 class="memtitle"><span class="permalink"><a href="#gaacf768c1ec64b020598afb985d7b30be">&#9670;&#160;</a></span>osTimerFunc_t</h2>
 317
 318 <div class="memitem">
 319 <div class="memproto">
 320       <table class="memname">
 321         <tr>
 322           <td class="memname">void(* osTimerFunc_t)(void *argument)</td>
 323         </tr>
 324       </table>
 325 </div><div class="memdoc">
 326
 327 <p>Timer callback function. </p>
 328 <p>The timer callback function is called every time the timer elapses.</p>
 329 <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>
 330 <dl class="params"><dt>Parameters</dt><dd>
 331   <table class="params">
 332     <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>
 333   </table>
 334   </dd>
 335 </dl>
 336
 337 </div>
 338 </div>
 339 <h2 class="groupheader">Enumeration Type Documentation</h2>
 340 <a id="ga7dc24a4c2b90334427081c3da7a71915" name="ga7dc24a4c2b90334427081c3da7a71915"></a>
 341 <h2 class="memtitle"><span class="permalink"><a href="#ga7dc24a4c2b90334427081c3da7a71915">&#9670;&#160;</a></span>osTimerType_t</h2>
 342
 343 <div class="memitem">
 344 <div class="memproto">
 345       <table class="memname">
 346         <tr>
 347           <td class="memname">enum <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">osTimerType_t</a></td>
 348         </tr>
 349       </table>
 350 </div><div class="memdoc">
 351
 352 <p>Timer type. </p>
 353 <p>The <b>osTimerType_t</b> specifies the timer type as repeating (periodic) or one-shot. Used in the function <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec">osTimerNew</a>. </p>
 354 <table class="fieldtable">
 355 <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>
 356 <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>
 357 </td></tr>
 358 <tr><td class="fieldname"><a id="gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35" name="gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35"></a>osTimerPeriodic&#160;</td><td class="fielddoc"><p>Repeating timer. </p>
 359 <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>
 360 </td></tr>
 361 </table>
 362
 363 </div>
 364 </div>
 365 <h2 class="groupheader">Function Documentation</h2>
 366 <a id="gad4e7f785c5f700a509f55a3bf6a62bec" name="gad4e7f785c5f700a509f55a3bf6a62bec"></a>
 367 <h2 class="memtitle"><span class="permalink"><a href="#gad4e7f785c5f700a509f55a3bf6a62bec">&#9670;&#160;</a></span>osTimerNew()</h2>
 368
 369 <div class="memitem">
 370 <div class="memproto">
 371       <table class="memname">
 372         <tr>
 373           <td class="memname"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a> osTimerNew </td>
 374           <td>(</td>
 375           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaacf768c1ec64b020598afb985d7b30be">osTimerFunc_t</a>&#160;</td>
 376           <td class="paramname"><em>func</em>, </td>
 377         </tr>
 378         <tr>
 379           <td class="paramkey"></td>
 380           <td></td>
 381           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga7dc24a4c2b90334427081c3da7a71915">osTimerType_t</a>&#160;</td>
 382           <td class="paramname"><em>type</em>, </td>
 383         </tr>
 384         <tr>
 385           <td class="paramkey"></td>
 386           <td></td>
 387           <td class="paramtype">void *&#160;</td>
 388           <td class="paramname"><em>argument</em>, </td>
 389         </tr>
 390         <tr>
 391           <td class="paramkey"></td>
 392           <td></td>
 393           <td class="paramtype">const <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#structosTimerAttr__t">osTimerAttr_t</a> *&#160;</td>
 394           <td class="paramname"><em>attr</em>&#160;</td>
 395         </tr>
 396         <tr>
 397           <td></td>
 398           <td>)</td>
 399           <td></td><td></td>
 400         </tr>
 401       </table>
 402 </div><div class="memdoc">
 403
 404 <p>Create and Initialize a timer. </p>
 405 <dl class="params"><dt>Parameters</dt><dd>
 406   <table class="params">
 407     <tr><td class="paramdir">[in]</td><td class="paramname">func</td><td>function pointer to callback function. </td></tr>
 408     <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>
 409     <tr><td class="paramdir">[in]</td><td class="paramname">argument</td><td>argument to the timer callback function. </td></tr>
 410     <tr><td class="paramdir">[in]</td><td class="paramname">attr</td><td>timer attributes; NULL: default values. </td></tr>
 411   </table>
 412   </dd>
 413 </dl>
 414 <dl class="section return"><dt>Returns</dt><dd>timer ID for reference by other functions or NULL in case of error.</dd></dl>
 415 <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>
 416 <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>
 417 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
 418 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 419 <div class="line"> </div>
 420 <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>
 421 <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>
 422 <div class="line"> </div>
 423 <div class="line">uint32_t exec1;                                 <span class="comment">// argument for the timer call back function</span></div>
 424 <div class="line">uint32_t exec2;                                 <span class="comment">// argument for the timer call back function</span></div>
 425 <div class="line"> </div>
 426 <div class="line"><span class="keywordtype">void</span> TimerCreate_example (<span class="keywordtype">void</span>)  {</div>
 427 <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>
 428 <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>
 429 <div class="line"> </div>
 430 <div class="line">  <span class="comment">// Create one-shoot timer</span></div>
 431 <div class="line">  exec1 = 1U;</div>
 432 <div class="line">  id1 = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec" title="Create and Initialize a timer.">osTimerNew</a>(Timer1_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915a2e0e1f31c742c84b497c4d7143357bdb" title="One-shot timer.">osTimerOnce</a>, &amp;exec1, NULL);</div>
 433 <div class="line">  <span class="keywordflow">if</span> (id1 != NULL) {</div>
 434 <div class="line">    <span class="comment">// One-shoot timer created</span></div>
 435 <div class="line">  }</div>
 436 <div class="line"> </div>
 437 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 438 <div class="line">  exec2 = 2U;</div>
 439 <div class="line">  id2 = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec" title="Create and Initialize a timer.">osTimerNew</a>(Timer2_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35" title="Repeating timer.">osTimerPeriodic</a>, &amp;exec2, NULL);</div>
 440 <div class="line">  <span class="keywordflow">if</span> (id2 != NULL) {</div>
 441 <div class="line">    <span class="comment">// Periodic timer created</span></div>
 442 <div class="line">  }</div>
 443 <div class="line">  :</div>
 444 <div class="line">}</div>
 445 </div><!-- fragment -->
 446 </div>
 447 </div>
 448 <a id="ga7938dde88ada1a01b60f41cf120069c0" name="ga7938dde88ada1a01b60f41cf120069c0"></a>
 449 <h2 class="memtitle"><span class="permalink"><a href="#ga7938dde88ada1a01b60f41cf120069c0">&#9670;&#160;</a></span>osTimerGetName()</h2>
 450
 451 <div class="memitem">
 452 <div class="memproto">
 453       <table class="memname">
 454         <tr>
 455           <td class="memname">const char * osTimerGetName </td>
 456           <td>(</td>
 457           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 458           <td class="paramname"><em>timer_id</em></td><td>)</td>
 459           <td></td>
 460         </tr>
 461       </table>
 462 </div><div class="memdoc">
 463
 464 <p>Get name of a timer. </p>
 465 <dl class="params"><dt>Parameters</dt><dd>
 466   <table class="params">
 467     <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>
 468   </table>
 469   </dd>
 470 </dl>
 471 <dl class="section return"><dt>Returns</dt><dd>name as null-terminated string.</dd></dl>
 472 <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>
 473 <dl class="section note"><dt>Note</dt><dd>This function may be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>. </dd></dl>
 474
 475 </div>
 476 </div>
 477 <a id="gab6ee2859ea657641b7adfac599b8121d" name="gab6ee2859ea657641b7adfac599b8121d"></a>
 478 <h2 class="memtitle"><span class="permalink"><a href="#gab6ee2859ea657641b7adfac599b8121d">&#9670;&#160;</a></span>osTimerStart()</h2>
 479
 480 <div class="memitem">
 481 <div class="memproto">
 482       <table class="memname">
 483         <tr>
 484           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osTimerStart </td>
 485           <td>(</td>
 486           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 487           <td class="paramname"><em>timer_id</em>, </td>
 488         </tr>
 489         <tr>
 490           <td class="paramkey"></td>
 491           <td></td>
 492           <td class="paramtype">uint32_t&#160;</td>
 493           <td class="paramname"><em>ticks</em>&#160;</td>
 494         </tr>
 495         <tr>
 496           <td></td>
 497           <td>)</td>
 498           <td></td><td></td>
 499         </tr>
 500       </table>
 501 </div><div class="memdoc">
 502
 503 <p>Start or restart a timer. </p>
 504 <dl class="params"><dt>Parameters</dt><dd>
 505   <table class="params">
 506     <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>
 507     <tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td><a class="el" href="usingOS2.html#CMSIS_RTOS_TimeOutValue">time ticks</a> value of the timer. </td></tr>
 508   </table>
 509   </dd>
 510 </dl>
 511 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 512 <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 <a class="el" href="usingOS2.html#CMSIS_RTOS_TimeOutValue">time ticks</a>.</p>
 513 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 514 <li><em>osOK:</em> the specified timer has been started or restarted.</li>
 515 <li><em>osErrorISR:</em> <b>osTimerStart</b> cannot be called from interrupt service routines.</li>
 516 <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>
 517 <li><em>osErrorResource:</em> the timer is in an invalid state.</li>
 518 <li><em>osErrorSafetyClass:</em> the calling thread safety class is lower than the safety class of the specified timer.</li>
 519 </ul>
 520 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
 521 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 522 <div class="line"> </div>
 523 <div class="line"><span class="keywordtype">void</span> Timer_Callback (<span class="keywordtype">void</span> *arg) {               <span class="comment">// timer callback function</span></div>
 524 <div class="line">                                                <span class="comment">// arg contains &amp;exec</span></div>
 525 <div class="line">                                                <span class="comment">// called every second after osTimerStart</span></div>
 526 <div class="line">}</div>
 527 <div class="line"> </div>
 528 <div class="line">uint32_t exec;                                  <span class="comment">// argument for the timer call back function</span></div>
 529 <div class="line"> </div>
 530 <div class="line"><span class="keywordtype">void</span> TimerStart_example (<span class="keywordtype">void</span>) {</div>
 531 <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>
 532 <div class="line">  uint32_t    timerDelay;                       <span class="comment">// timer value</span></div>
 533 <div class="line">  <a class="code hl_enumeration" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e" title="Status code values returned by CMSIS-RTOS functions.">osStatus_t</a>  status;                           <span class="comment">// function return status</span></div>
 534 <div class="line"> </div>
 535 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 536 <div class="line">  exec = 1U;</div>
 537 <div class="line">  <span class="keywordtype">id</span> = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec" title="Create and Initialize a timer.">osTimerNew</a>(Timer_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35" title="Repeating timer.">osTimerPeriodic</a>, &amp;exec, NULL);</div>
 538 <div class="line">  <span class="keywordflow">if</span> (<span class="keywordtype">id</span> != NULL)  {</div>
 539 <div class="line">    timerDelay = 1000U;</div>
 540 <div class="line">    status = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d" title="Start or restart a timer.">osTimerStart</a>(<span class="keywordtype">id</span>, timerDelay);       <span class="comment">// start timer</span></div>
 541 <div class="line">    <span class="keywordflow">if</span> (status != <a class="code hl_enumvalue" href="group__CMSIS__RTOS__Definitions.html#gga6c0dbe6069e4e7f47bb4cd32ae2b813eab17c65ad8b5bae759882b41c5bf35cda" title="Operation completed successfully.">osOK</a>) {</div>
 542 <div class="line">      <span class="comment">// Timer could not be started</span></div>
 543 <div class="line">    }</div>
 544 <div class="line">  }</div>
 545 <div class="line">  ;</div>
 546 <div class="line">}</div>
 547 </div><!-- fragment -->
 548 </div>
 549 </div>
 550 <a id="gabd7a89356da7717293eb0bc5d87b8ac9" name="gabd7a89356da7717293eb0bc5d87b8ac9"></a>
 551 <h2 class="memtitle"><span class="permalink"><a href="#gabd7a89356da7717293eb0bc5d87b8ac9">&#9670;&#160;</a></span>osTimerStop()</h2>
 552
 553 <div class="memitem">
 554 <div class="memproto">
 555       <table class="memname">
 556         <tr>
 557           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osTimerStop </td>
 558           <td>(</td>
 559           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 560           <td class="paramname"><em>timer_id</em></td><td>)</td>
 561           <td></td>
 562         </tr>
 563       </table>
 564 </div><div class="memdoc">
 565
 566 <p>Stop a timer. </p>
 567 <dl class="params"><dt>Parameters</dt><dd>
 568   <table class="params">
 569     <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>
 570   </table>
 571   </dd>
 572 </dl>
 573 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 574 <p>The function <b>osTimerStop</b> stops a timer specified by the parameter <em>timer_id</em>.</p>
 575 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 576 <li><em>osOK:</em> the specified timer has been stopped.</li>
 577 <li><em>osErrorISR:</em> <b>osTimerStop</b> cannot be called from interrupt service routines.</li>
 578 <li><em>osErrorParameter:</em> parameter <em>timer_id</em> is either <span class="XML-Token">NULL</span> or invalid.</li>
 579 <li><em>osErrorResource:</em> the timer is not running (you can only stop a running timer).</li>
 580 <li><em>osErrorSafetyClass:</em> the calling thread safety class is lower than the safety class of the specified timer.</li>
 581 </ul>
 582 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
 583 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 584 <div class="line"> </div>
 585 <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>
 586 <div class="line"> </div>
 587 <div class="line">uint32_t exec;                                  <span class="comment">// argument for the timer call back function</span></div>
 588 <div class="line"> </div>
 589 <div class="line"><span class="keywordtype">void</span> TimerStop_example (<span class="keywordtype">void</span>) {</div>
 590 <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>
 591 <div class="line">  <a class="code hl_enumeration" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e" title="Status code values returned by CMSIS-RTOS functions.">osStatus_t</a>  status;                           <span class="comment">// function return status</span></div>
 592 <div class="line"> </div>
 593 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 594 <div class="line">  exec = 1U;</div>
 595 <div class="line">  <span class="keywordtype">id</span> = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec" title="Create and Initialize a timer.">osTimerNew</a>(Timer_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35" title="Repeating timer.">osTimerPeriodic</a>, &amp;exec, NULL);</div>
 596 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d" title="Start or restart a timer.">osTimerStart</a>(<span class="keywordtype">id</span>, 1000U);                      <span class="comment">// start timer</span></div>
 597 <div class="line">  :</div>
 598 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gabd7a89356da7717293eb0bc5d87b8ac9" title="Stop a timer.">osTimerStop</a>(<span class="keywordtype">id</span>);                     <span class="comment">// stop timer</span></div>
 599 <div class="line">  <span class="keywordflow">if</span> (status != <a class="code hl_enumvalue" href="group__CMSIS__RTOS__Definitions.html#gga6c0dbe6069e4e7f47bb4cd32ae2b813eab17c65ad8b5bae759882b41c5bf35cda" title="Operation completed successfully.">osOK</a>) {</div>
 600 <div class="line">    <span class="comment">// Timer could not be stopped</span></div>
 601 <div class="line">  }</div>
 602 <div class="line">  ;</div>
 603 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d" title="Start or restart a timer.">osTimerStart</a>(<span class="keywordtype">id</span>, 1000U);                      <span class="comment">// start timer again</span></div>
 604 <div class="line">  ;</div>
 605 <div class="line">}</div>
 606 </div><!-- fragment -->
 607 </div>
 608 </div>
 609 <a id="ga69d3589f54194022c30dd01e45ec6741" name="ga69d3589f54194022c30dd01e45ec6741"></a>
 610 <h2 class="memtitle"><span class="permalink"><a href="#ga69d3589f54194022c30dd01e45ec6741">&#9670;&#160;</a></span>osTimerIsRunning()</h2>
 611
 612 <div class="memitem">
 613 <div class="memproto">
 614       <table class="memname">
 615         <tr>
 616           <td class="memname">uint32_t osTimerIsRunning </td>
 617           <td>(</td>
 618           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 619           <td class="paramname"><em>timer_id</em></td><td>)</td>
 620           <td></td>
 621         </tr>
 622       </table>
 623 </div><div class="memdoc">
 624
 625 <p>Check if a timer is running. </p>
 626 <dl class="params"><dt>Parameters</dt><dd>
 627   <table class="params">
 628     <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>
 629   </table>
 630   </dd>
 631 </dl>
 632 <dl class="section return"><dt>Returns</dt><dd>0 not running, 1 running.</dd></dl>
 633 <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>
 634 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>. </dd></dl>
 635
 636 </div>
 637 </div>
 638 <a id="gad0001dd74721ab461789324806db2453" name="gad0001dd74721ab461789324806db2453"></a>
 639 <h2 class="memtitle"><span class="permalink"><a href="#gad0001dd74721ab461789324806db2453">&#9670;&#160;</a></span>osTimerDelete()</h2>
 640
 641 <div class="memitem">
 642 <div class="memproto">
 643       <table class="memname">
 644         <tr>
 645           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osTimerDelete </td>
 646           <td>(</td>
 647           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#gaad5409379689ee27bb0a0b56ea4a4b34">osTimerId_t</a>&#160;</td>
 648           <td class="paramname"><em>timer_id</em></td><td>)</td>
 649           <td></td>
 650         </tr>
 651       </table>
 652 </div><div class="memdoc">
 653
 654 <p>Delete a timer. </p>
 655 <dl class="params"><dt>Parameters</dt><dd>
 656   <table class="params">
 657     <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>
 658   </table>
 659   </dd>
 660 </dl>
 661 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 662 <p>The function <b>osTimerDelete</b> deletes the timer specified by parameter <em>timer_id</em>.</p>
 663 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 664 <li><em>osOK:</em> the specified timer has been deleted.</li>
 665 <li><em>osErrorISR:</em> <b>osTimerDelete</b> cannot be called from interrupt service routines.</li>
 666 <li><em>osErrorParameter:</em> parameter <em>timer_id</em> is either <span class="XML-Token">NULL</span> or invalid.</li>
 667 <li><em>osErrorResource:</em> the timer is in an invalid state.</li>
 668 <li><em>osErrorSafetyClass:</em> the calling thread safety class is lower than the safety class of the specified timer.</li>
 669 </ul>
 670 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
 671 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 672 <div class="line"> </div>
 673 <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>
 674 <div class="line"> </div>
 675 <div class="line">uint32_t exec;                                  <span class="comment">// argument for the timer call back function</span></div>
 676 <div class="line"> </div>
 677 <div class="line"><span class="keywordtype">void</span> TimerDelete_example (<span class="keywordtype">void</span>) {</div>
 678 <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>
 679 <div class="line">  <a class="code hl_enumeration" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e" title="Status code values returned by CMSIS-RTOS functions.">osStatus_t</a>  status;                           <span class="comment">// function return status  </span></div>
 680 <div class="line"> </div>
 681 <div class="line">  <span class="comment">// Create periodic timer</span></div>
 682 <div class="line">  exec = 1U;</div>
 683 <div class="line">  <span class="keywordtype">id</span> = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad4e7f785c5f700a509f55a3bf6a62bec" title="Create and Initialize a timer.">osTimerNew</a>(Timer_Callback, <a class="code hl_enumvalue" href="group__CMSIS__RTOS__TimerMgmt.html#gga7dc24a4c2b90334427081c3da7a71915ab3463d921dc310938094745c230f2b35" title="Repeating timer.">osTimerPeriodic</a>, &amp;exec, NULL);</div>
 684 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gab6ee2859ea657641b7adfac599b8121d" title="Start or restart a timer.">osTimerStart</a>(<span class="keywordtype">id</span>, 1000U);                      <span class="comment">// start timer</span></div>
 685 <div class="line">  ;</div>
 686 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__TimerMgmt.html#gad0001dd74721ab461789324806db2453" title="Delete a timer.">osTimerDelete</a>(<span class="keywordtype">id</span>);                   <span class="comment">// stop and delete timer</span></div>
 687 <div class="line">  <span class="keywordflow">if</span> (status != <a class="code hl_enumvalue" href="group__CMSIS__RTOS__Definitions.html#gga6c0dbe6069e4e7f47bb4cd32ae2b813eab17c65ad8b5bae759882b41c5bf35cda" title="Operation completed successfully.">osOK</a>) {</div>
 688 <div class="line">    <span class="comment">// Timer could not be deleted</span></div>
 689 <div class="line">  } </div>
 690 <div class="line">  ;</div>
 691 <div class="line">}</div>
 692 </div><!-- fragment -->
 693 </div>
 694 </div>
 695 <h2 class="groupheader">Variable Documentation</h2>
 696 <a id="ga6e93b49cb79c12f768d72580c7731f30" name="ga6e93b49cb79c12f768d72580c7731f30"></a>
 697 <h2 class="memtitle"><span class="permalink"><a href="#ga6e93b49cb79c12f768d72580c7731f30">&#9670;&#160;</a></span>attr_bits</h2>
 698
 699 <div class="memitem">
 700 <div class="memproto">
 701       <table class="memname">
 702         <tr>
 703           <td class="memname">attr_bits</td>
 704         </tr>
 705       </table>
 706 </div><div class="memdoc">
 707
 708 <p>attribute bits </p>
 709 <p>Reserved for future use (must be set to '0' for future compatibility). </p>
 710
 711 </div>
 712 </div>
 713 <a id="ga1e100dc33d403841ed3c344e3397868e" name="ga1e100dc33d403841ed3c344e3397868e"></a>
 714 <h2 class="memtitle"><span class="permalink"><a href="#ga1e100dc33d403841ed3c344e3397868e">&#9670;&#160;</a></span>cb_mem</h2>
 715
 716 <div class="memitem">
 717 <div class="memproto">
 718       <table class="memname">
 719         <tr>
 720           <td class="memname">cb_mem</td>
 721         </tr>
 722       </table>
 723 </div><div class="memdoc">
 724
 725 <p>memory for control block </p>
 726 <p>Pointer to a memory for the timer control block object. Refer to <a class="el" href="usingOS2.html#CMSIS_RTOS_MemoryMgmt_Manual">Manual User-defined Allocation</a> for more information.</p>
 727 <p>Default: <span class="XML-Token">NULL</span> to use <a class="el" href="usingOS2.html#CMSIS_RTOS_MemoryMgmt_Automatic">Automatic Dynamic Allocation</a> for the timer control block. </p>
 728
 729 </div>
 730 </div>
 731 <a id="gaa55a4335d12dc2785dc00fdc292d1159" name="gaa55a4335d12dc2785dc00fdc292d1159"></a>
 732 <h2 class="memtitle"><span class="permalink"><a href="#gaa55a4335d12dc2785dc00fdc292d1159">&#9670;&#160;</a></span>cb_size</h2>
 733
 734 <div class="memitem">
 735 <div class="memproto">
 736       <table class="memname">
 737         <tr>
 738           <td class="memname">cb_size</td>
 739         </tr>
 740       </table>
 741 </div><div class="memdoc">
 742
 743 <p>size of provided memory for control block </p>
 744 <p>The size (in bytes) of memory block passed with <a class="el" href="group__CMSIS__RTOS__TimerMgmt.html#ga1e100dc33d403841ed3c344e3397868e">cb_mem</a>. Required value depends on the underlying kernel implementation.</p>
 745 <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#ga1e100dc33d403841ed3c344e3397868e">cb_mem</a>. </p>
 746
 747 </div>
 748 </div>
 749 <a id="gab74e6bf80237ddc4109968cedc58c151" name="gab74e6bf80237ddc4109968cedc58c151"></a>
 750 <h2 class="memtitle"><span class="permalink"><a href="#gab74e6bf80237ddc4109968cedc58c151">&#9670;&#160;</a></span>name</h2>
 751
 752 <div class="memitem">
 753 <div class="memproto">
 754       <table class="memname">
 755         <tr>
 756           <td class="memname">name</td>
 757         </tr>
 758       </table>
 759 </div><div class="memdoc">
 760
 761 <p>name of the timer </p>
 762 <p>Pointer to a constant string with a human readable name (displayed during debugging) of the timer object.</p>
 763 <p>Default: <span class="XML-Token">NULL</span> no name specified. </p>
 764
 765 </div>
 766 </div>
 767 </div><!-- contents -->
 768 </div><!-- doc-content -->
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