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

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  46    <div id="projectname">CMSIS-RTOS2
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  55    <div id="projectbrief">Real-Time Operating System API</div>
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 128
 129 <div class="header">
 130   <div class="summary">
 131 <a href="#nested-classes">Data Structures</a> &#124;
 132 <a href="#enum-members">Enumerations</a> &#124;
 133 <a href="#func-members">Functions</a>  </div>
 134   <div class="headertitle"><div class="title">Kernel Information and Control<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS2 API</a></div></div></div>
 135 </div><!--header-->
 136 <div class="contents">
 137
 138 <p>Provides version/system information and starts/controls the RTOS Kernel.
 139 <a href="#details">More...</a></p>
 140 <table class="memberdecls">
 141 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="nested-classes" name="nested-classes"></a>
 142 Data Structures</h2></td></tr>
 143 <tr class="memitem:structosVersion__t"><td class="memItemLeft" align="right" valign="top">struct &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#structosVersion__t">osVersion_t</a></td></tr>
 144 <tr class="memdesc:structosVersion__t"><td class="mdescLeft">&#160;</td><td class="mdescRight">Version information.  <a href="group__CMSIS__RTOS__KernelCtrl.html#structosVersion__t">More...</a><br /></td></tr>
 145 <tr class="separator:structosVersion__t"><td class="memSeparator" colspan="2">&#160;</td></tr>
 146 </table><table class="memberdecls">
 147 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="enum-members" name="enum-members"></a>
 148 Enumerations</h2></td></tr>
 149 <tr class="memitem:ga08326469274b668140ca934b168a5ad4"><td class="memItemLeft" align="right" valign="top">enum &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga08326469274b668140ca934b168a5ad4">osKernelState_t</a> { <br />
 150 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a2ad3e5912db47b497529d036c89e7995">osKernelInactive</a> = 0
 151 , <br />
 152 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a0596c6e14113447604753656417c9a24">osKernelReady</a> = 1
 153 , <br />
 154 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a8e0b699fbe1c8bb66fefadd5911cb6ce">osKernelRunning</a> = 2
 155 , <br />
 156 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a2fe382ad5ebab2257b35740414b28b01">osKernelLocked</a> = 3
 157 , <br />
 158 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4ad364464ad84d63b1413a9ac8a962390c">osKernelSuspended</a> = 4
 159 , <br />
 160 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a0545c92c18ce8e6b24e82a0d694a0b4a">osKernelError</a> = -1
 161 , <br />
 162 &#160;&#160;<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4ab0a47576defa29396a649d9173d4bc4b">osKernelReserved</a> = 0x7FFFFFFF
 163 <br />
 164  }</td></tr>
 165 <tr class="memdesc:ga08326469274b668140ca934b168a5ad4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Kernel state.  <a href="group__CMSIS__RTOS__KernelCtrl.html#ga08326469274b668140ca934b168a5ad4">More...</a><br /></td></tr>
 166 <tr class="separator:ga08326469274b668140ca934b168a5ad4"><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:gae818f6611d25ba3140bede410a52d659"><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__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659">osKernelInitialize</a> (void)</td></tr>
 171 <tr class="memdesc:gae818f6611d25ba3140bede410a52d659"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initialize the RTOS Kernel.  <br /></td></tr>
 172 <tr class="separator:gae818f6611d25ba3140bede410a52d659"><td class="memSeparator" colspan="2">&#160;</td></tr>
 173 <tr class="memitem:ga6f7764e7250c5c5364c00c45a5d1d199"><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__KernelCtrl.html#ga6f7764e7250c5c5364c00c45a5d1d199">osKernelGetInfo</a> (<a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#structosVersion__t">osVersion_t</a> *version, char *id_buf, uint32_t id_size)</td></tr>
 174 <tr class="memdesc:ga6f7764e7250c5c5364c00c45a5d1d199"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get RTOS Kernel Information.  <br /></td></tr>
 175 <tr class="separator:ga6f7764e7250c5c5364c00c45a5d1d199"><td class="memSeparator" colspan="2">&#160;</td></tr>
 176 <tr class="memitem:ga48b69b81012fce051f639be288b243ba"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga08326469274b668140ca934b168a5ad4">osKernelState_t</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga48b69b81012fce051f639be288b243ba">osKernelGetState</a> (void)</td></tr>
 177 <tr class="memdesc:ga48b69b81012fce051f639be288b243ba"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the current RTOS Kernel state.  <br /></td></tr>
 178 <tr class="separator:ga48b69b81012fce051f639be288b243ba"><td class="memSeparator" colspan="2">&#160;</td></tr>
 179 <tr class="memitem:ga9ae2cc00f0d89d7b6a307bba942b5221"><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__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221">osKernelStart</a> (void)</td></tr>
 180 <tr class="memdesc:ga9ae2cc00f0d89d7b6a307bba942b5221"><td class="mdescLeft">&#160;</td><td class="mdescRight">Start the RTOS Kernel scheduler.  <br /></td></tr>
 181 <tr class="separator:ga9ae2cc00f0d89d7b6a307bba942b5221"><td class="memSeparator" colspan="2">&#160;</td></tr>
 182 <tr class="memitem:ga948609ee930d9b38336b9e1c2a4dfe12"><td class="memItemLeft" align="right" valign="top">int32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12">osKernelLock</a> (void)</td></tr>
 183 <tr class="memdesc:ga948609ee930d9b38336b9e1c2a4dfe12"><td class="mdescLeft">&#160;</td><td class="mdescRight">Lock the RTOS Kernel scheduler.  <br /></td></tr>
 184 <tr class="separator:ga948609ee930d9b38336b9e1c2a4dfe12"><td class="memSeparator" colspan="2">&#160;</td></tr>
 185 <tr class="memitem:gaf401728b4657456198c33fe75f8d6720"><td class="memItemLeft" align="right" valign="top">int32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720">osKernelUnlock</a> (void)</td></tr>
 186 <tr class="memdesc:gaf401728b4657456198c33fe75f8d6720"><td class="mdescLeft">&#160;</td><td class="mdescRight">Unlock the RTOS Kernel scheduler.  <br /></td></tr>
 187 <tr class="separator:gaf401728b4657456198c33fe75f8d6720"><td class="memSeparator" colspan="2">&#160;</td></tr>
 188 <tr class="memitem:gae7d0a71b9586cbbb49fcbdf6a04f0289"><td class="memItemLeft" align="right" valign="top">int32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae7d0a71b9586cbbb49fcbdf6a04f0289">osKernelRestoreLock</a> (int32_t lock)</td></tr>
 189 <tr class="memdesc:gae7d0a71b9586cbbb49fcbdf6a04f0289"><td class="mdescLeft">&#160;</td><td class="mdescRight">Restore the RTOS Kernel scheduler lock state.  <br /></td></tr>
 190 <tr class="separator:gae7d0a71b9586cbbb49fcbdf6a04f0289"><td class="memSeparator" colspan="2">&#160;</td></tr>
 191 <tr class="memitem:gae26683e1606ec633354a2876c68f0c1f"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae26683e1606ec633354a2876c68f0c1f">osKernelSuspend</a> (void)</td></tr>
 192 <tr class="memdesc:gae26683e1606ec633354a2876c68f0c1f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Suspend the RTOS Kernel scheduler.  <br /></td></tr>
 193 <tr class="separator:gae26683e1606ec633354a2876c68f0c1f"><td class="memSeparator" colspan="2">&#160;</td></tr>
 194 <tr class="memitem:ga8c4b4d7ed34cab73c001665d9176aced"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga8c4b4d7ed34cab73c001665d9176aced">osKernelResume</a> (uint32_t sleep_ticks)</td></tr>
 195 <tr class="memdesc:ga8c4b4d7ed34cab73c001665d9176aced"><td class="mdescLeft">&#160;</td><td class="mdescRight">Resume the RTOS Kernel scheduler.  <br /></td></tr>
 196 <tr class="separator:ga8c4b4d7ed34cab73c001665d9176aced"><td class="memSeparator" colspan="2">&#160;</td></tr>
 197 <tr class="memitem:ga84bcdbf2fb76b10c8df4e439f0c7e11b"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b">osKernelGetTickCount</a> (void)</td></tr>
 198 <tr class="memdesc:ga84bcdbf2fb76b10c8df4e439f0c7e11b"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the RTOS kernel tick count.  <br /></td></tr>
 199 <tr class="separator:ga84bcdbf2fb76b10c8df4e439f0c7e11b"><td class="memSeparator" colspan="2">&#160;</td></tr>
 200 <tr class="memitem:ga7a8d7bd927eaaa58999f91d7d6310cee"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga7a8d7bd927eaaa58999f91d7d6310cee">osKernelGetTickFreq</a> (void)</td></tr>
 201 <tr class="memdesc:ga7a8d7bd927eaaa58999f91d7d6310cee"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the RTOS kernel tick frequency.  <br /></td></tr>
 202 <tr class="separator:ga7a8d7bd927eaaa58999f91d7d6310cee"><td class="memSeparator" colspan="2">&#160;</td></tr>
 203 <tr class="memitem:gae0fcaff6cecfb4013bb556c87afcd7d2"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae0fcaff6cecfb4013bb556c87afcd7d2">osKernelGetSysTimerCount</a> (void)</td></tr>
 204 <tr class="memdesc:gae0fcaff6cecfb4013bb556c87afcd7d2"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the RTOS kernel system timer count.  <br /></td></tr>
 205 <tr class="separator:gae0fcaff6cecfb4013bb556c87afcd7d2"><td class="memSeparator" colspan="2">&#160;</td></tr>
 206 <tr class="memitem:ga4d69215a93220f72be3684cad582f16a"><td class="memItemLeft" align="right" valign="top">uint32_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga4d69215a93220f72be3684cad582f16a">osKernelGetSysTimerFreq</a> (void)</td></tr>
 207 <tr class="memdesc:ga4d69215a93220f72be3684cad582f16a"><td class="mdescLeft">&#160;</td><td class="mdescRight">Get the RTOS kernel system timer frequency.  <br /></td></tr>
 208 <tr class="separator:ga4d69215a93220f72be3684cad582f16a"><td class="memSeparator" colspan="2">&#160;</td></tr>
 209 <tr class="memitem:gac7e3b012c15c55bda68e0dd96ad9cd72"><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__KernelCtrl.html#gac7e3b012c15c55bda68e0dd96ad9cd72">osKernelProtect</a> (uint32_t safety_class)</td></tr>
 210 <tr class="memdesc:gac7e3b012c15c55bda68e0dd96ad9cd72"><td class="mdescLeft">&#160;</td><td class="mdescRight">Protect the RTOS Kernel scheduler access.  <br /></td></tr>
 211 <tr class="separator:gac7e3b012c15c55bda68e0dd96ad9cd72"><td class="memSeparator" colspan="2">&#160;</td></tr>
 212 <tr class="memitem:ga2065364d1bc805a40e749430377df1e1"><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__KernelCtrl.html#ga2065364d1bc805a40e749430377df1e1">osKernelDestroyClass</a> (uint32_t safety_class, uint32_t mode)</td></tr>
 213 <tr class="memdesc:ga2065364d1bc805a40e749430377df1e1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Destroy objects for specified safety classes.  <br /></td></tr>
 214 <tr class="separator:ga2065364d1bc805a40e749430377df1e1"><td class="memSeparator" colspan="2">&#160;</td></tr>
 215 <tr class="memitem:ga91b400b21a9093f7751fc45613c12110"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga91b400b21a9093f7751fc45613c12110">osFaultResume</a> (void)</td></tr>
 216 <tr class="memdesc:ga91b400b21a9093f7751fc45613c12110"><td class="mdescLeft">&#160;</td><td class="mdescRight">Resume normal operation when exiting exception faults.  <br /></td></tr>
 217 <tr class="separator:ga91b400b21a9093f7751fc45613c12110"><td class="memSeparator" colspan="2">&#160;</td></tr>
 218 </table>
 219 <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
 220 <p>Provides version/system information and starts/controls the RTOS Kernel. </p>
 221 <p>The kernel Information and Control function group allows to:</p><ul>
 222 <li>obtain information about the system and the underlying kernel.</li>
 223 <li>obtain version information about the CMSIS-RTOS API.</li>
 224 <li>initialize of the RTOS kernel for creating objects.</li>
 225 <li>start the RTOS kernel and thread switching.</li>
 226 <li>check the execution status of the RTOS kernel.</li>
 227 </ul>
 228 <dl class="section note"><dt>Note</dt><dd>The kernel information and control functions cannot be called from <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>. </dd>
 229 <dd>
 230 The kernel initialization is documented in <a class="el" href="usingOS2.html#SystemStartup">System Startup</a>.</dd></dl>
 231 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
 232 <div class="line"><span class="comment"> * Application main thread</span></div>
 233 <div class="line"><span class="comment"> *---------------------------------------------------------------------------*/</span></div>
 234 <div class="line"><span class="keywordtype">void</span> app_main (<span class="keywordtype">void</span> *argument) {</div>
 235 <div class="line"> </div>
 236 <div class="line">  <span class="comment">// ...</span></div>
 237 <div class="line">  <span class="keywordflow">for</span> (;;) {}</div>
 238 <div class="line">}</div>
 239 <div class="line"> </div>
 240 <div class="line"><span class="keywordtype">int</span> main (<span class="keywordtype">void</span>) {</div>
 241 <div class="line"> </div>
 242 <div class="line">  <span class="comment">// System Initialization</span></div>
 243 <div class="line">  SystemCoreClockUpdate();</div>
 244 <div class="line">  <span class="comment">// ...</span></div>
 245 <div class="line"> </div>
 246 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659" title="Initialize the RTOS Kernel.">osKernelInitialize</a>();                 <span class="comment">// Initialize CMSIS-RTOS</span></div>
 247 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__ThreadMgmt.html#ga48d68b8666d99d28fa646ee1d2182b8f" title="Create a thread and add it to Active Threads.">osThreadNew</a>(app_main, NULL, NULL);    <span class="comment">// Create application main thread</span></div>
 248 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221" title="Start the RTOS Kernel scheduler.">osKernelStart</a>();                      <span class="comment">// Start thread execution</span></div>
 249 <div class="line">  <span class="keywordflow">for</span> (;;) {}</div>
 250 <div class="line">}</div>
 251 </div><!-- fragment --> <hr/><h2 class="groupheader">Data Structure Documentation</h2>
 252 <a name="structosVersion__t" id="structosVersion__t"></a>
 253 <h2 class="memtitle"><span class="permalink"><a href="#structosVersion__t">&#9670;&#160;</a></span>osVersion_t</h2>
 254
 255 <div class="memitem">
 256 <div class="memproto">
 257       <table class="memname">
 258         <tr>
 259           <td class="memname">struct osVersion_t</td>
 260         </tr>
 261       </table>
 262 </div><div class="memdoc">
 263 <div class="textblock"><p>Version information. </p>
 264 <p>Identifies the underlying RTOS kernel and API version number. The version is represented in a combined decimal number in the format: major.minor.rev: mmnnnrrrr</p>
 265 <p>Use <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga6f7764e7250c5c5364c00c45a5d1d199">osKernelGetInfo</a> to retrieve the version numbers. </p>
 266 </div><table class="fieldtable">
 267 <tr><th colspan="3">Data Fields</th></tr>
 268 <tr><td class="fieldtype">
 269 <a id="a76a1ef1a4d3d9bd3e70783051f22a6d3" name="a76a1ef1a4d3d9bd3e70783051f22a6d3"></a>uint32_t</td>
 270 <td class="fieldname">
 271 api</td>
 272 <td class="fielddoc">
 273 API version (major.minor.rev: mmnnnrrrr dec). </td></tr>
 274 <tr><td class="fieldtype">
 275 <a id="ad8075d3f42141346ae2c56389358f9e7" name="ad8075d3f42141346ae2c56389358f9e7"></a>uint32_t</td>
 276 <td class="fieldname">
 277 kernel</td>
 278 <td class="fielddoc">
 279 Kernel version (major.minor.rev: mmnnnrrrr dec). </td></tr>
 280 </table>
 281
 282 </div>
 283 </div>
 284 <h2 class="groupheader">Enumeration Type Documentation</h2>
 285 <a id="ga08326469274b668140ca934b168a5ad4" name="ga08326469274b668140ca934b168a5ad4"></a>
 286 <h2 class="memtitle"><span class="permalink"><a href="#ga08326469274b668140ca934b168a5ad4">&#9670;&#160;</a></span>osKernelState_t</h2>
 287
 288 <div class="memitem">
 289 <div class="memproto">
 290       <table class="memname">
 291         <tr>
 292           <td class="memname">enum <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga08326469274b668140ca934b168a5ad4">osKernelState_t</a></td>
 293         </tr>
 294       </table>
 295 </div><div class="memdoc">
 296
 297 <p>Kernel state. </p>
 298 <p>State of the kernel as retrieved by <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga48b69b81012fce051f639be288b243ba">osKernelGetState</a>. In case <b>osKernelGetState</b> fails or if it is called from an ISR, it will return <code>osKernelError</code>, otherwise it returns the kernel state. </p>
 299 <table class="fieldtable">
 300 <tr><th colspan="2">Enumerator</th></tr><tr><td class="fieldname"><a id="gga08326469274b668140ca934b168a5ad4a2ad3e5912db47b497529d036c89e7995" name="gga08326469274b668140ca934b168a5ad4a2ad3e5912db47b497529d036c89e7995"></a>osKernelInactive&#160;</td><td class="fielddoc"><p>Inactive. </p>
 301 <p>The kernel is not ready yet. <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659">osKernelInitialize</a> needs to be executed successfully. </p>
 302 </td></tr>
 303 <tr><td class="fieldname"><a id="gga08326469274b668140ca934b168a5ad4a0596c6e14113447604753656417c9a24" name="gga08326469274b668140ca934b168a5ad4a0596c6e14113447604753656417c9a24"></a>osKernelReady&#160;</td><td class="fielddoc"><p>Ready. </p>
 304 <p>The kernel is not yet running. <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221">osKernelStart</a> transfers the kernel to the running state. </p>
 305 </td></tr>
 306 <tr><td class="fieldname"><a id="gga08326469274b668140ca934b168a5ad4a8e0b699fbe1c8bb66fefadd5911cb6ce" name="gga08326469274b668140ca934b168a5ad4a8e0b699fbe1c8bb66fefadd5911cb6ce"></a>osKernelRunning&#160;</td><td class="fielddoc"><p>Running. </p>
 307 <p>The kernel is initialized and running. </p>
 308 </td></tr>
 309 <tr><td class="fieldname"><a id="gga08326469274b668140ca934b168a5ad4a2fe382ad5ebab2257b35740414b28b01" name="gga08326469274b668140ca934b168a5ad4a2fe382ad5ebab2257b35740414b28b01"></a>osKernelLocked&#160;</td><td class="fielddoc"><p>Locked. </p>
 310 <p>The kernel was locked with <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12">osKernelLock</a>. The functions <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720">osKernelUnlock</a> or <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae7d0a71b9586cbbb49fcbdf6a04f0289">osKernelRestoreLock</a> unlocks it. </p>
 311 </td></tr>
 312 <tr><td class="fieldname"><a id="gga08326469274b668140ca934b168a5ad4ad364464ad84d63b1413a9ac8a962390c" name="gga08326469274b668140ca934b168a5ad4ad364464ad84d63b1413a9ac8a962390c"></a>osKernelSuspended&#160;</td><td class="fielddoc"><p>Suspended. </p>
 313 <p>The kernel was suspended using <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae26683e1606ec633354a2876c68f0c1f">osKernelSuspend</a>. The function <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga8c4b4d7ed34cab73c001665d9176aced">osKernelResume</a> returns to normal operation. </p>
 314 </td></tr>
 315 <tr><td class="fieldname"><a id="gga08326469274b668140ca934b168a5ad4a0545c92c18ce8e6b24e82a0d694a0b4a" name="gga08326469274b668140ca934b168a5ad4a0545c92c18ce8e6b24e82a0d694a0b4a"></a>osKernelError&#160;</td><td class="fielddoc"><p>Error. </p>
 316 <p>An error occurred. </p>
 317 </td></tr>
 318 <tr><td class="fieldname"><a id="gga08326469274b668140ca934b168a5ad4ab0a47576defa29396a649d9173d4bc4b" name="gga08326469274b668140ca934b168a5ad4ab0a47576defa29396a649d9173d4bc4b"></a>osKernelReserved&#160;</td><td class="fielddoc"><p>Prevents enum down-size compiler optimization. </p>
 319 <p>Reserved. </p>
 320 </td></tr>
 321 </table>
 322
 323 </div>
 324 </div>
 325 <h2 class="groupheader">Function Documentation</h2>
 326 <a id="gae818f6611d25ba3140bede410a52d659" name="gae818f6611d25ba3140bede410a52d659"></a>
 327 <h2 class="memtitle"><span class="permalink"><a href="#gae818f6611d25ba3140bede410a52d659">&#9670;&#160;</a></span>osKernelInitialize()</h2>
 328
 329 <div class="memitem">
 330 <div class="memproto">
 331       <table class="memname">
 332         <tr>
 333           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osKernelInitialize </td>
 334           <td>(</td>
 335           <td class="paramtype">void&#160;</td>
 336           <td class="paramname"></td><td>)</td>
 337           <td></td>
 338         </tr>
 339       </table>
 340 </div><div class="memdoc">
 341
 342 <p>Initialize the RTOS Kernel. </p>
 343 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 344 <p>The function <b>osKernelInitialize</b> initializes the RTOS Kernel. Before it is successfully executed, only the functions <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga6f7764e7250c5c5364c00c45a5d1d199">osKernelGetInfo</a> and <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga48b69b81012fce051f639be288b243ba">osKernelGetState</a> may be called.</p>
 345 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 346 <li><em>osOK</em> in case of success.</li>
 347 <li><em>osError</em> if an unspecific error occurred.</li>
 348 <li><em>osErrorISR</em> if called from an <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routine</a>.</li>
 349 <li><em>osErrorNoMemory</em> if no memory could be reserved for the operation.</li>
 350 </ul>
 351 <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>
 352 <p><b> Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;RTE_Components.h&quot;</span></div>
 353 <div class="line"><span class="preprocessor">#include  CMSIS_device_header</span></div>
 354 <div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 355 <div class="line"> </div>
 356 <div class="line"><span class="comment">/*----------------------------------------------------------------------------</span></div>
 357 <div class="line"><span class="comment"> * Application main thread</span></div>
 358 <div class="line"><span class="comment"> *---------------------------------------------------------------------------*/</span></div>
 359 <div class="line"><span class="keywordtype">void</span> app_main (<span class="keywordtype">void</span> *argument) {</div>
 360 <div class="line"> </div>
 361 <div class="line">  <span class="comment">// ...</span></div>
 362 <div class="line">  <span class="keywordflow">for</span> (;;) {}</div>
 363 <div class="line">}</div>
 364 <div class="line"> </div>
 365 <div class="line"><span class="keywordtype">int</span> main (<span class="keywordtype">void</span>) {</div>
 366 <div class="line"> </div>
 367 <div class="line">  <span class="comment">// System Initialization</span></div>
 368 <div class="line">  SystemCoreClockUpdate();</div>
 369 <div class="line">  <span class="comment">// ...</span></div>
 370 <div class="line"> </div>
 371 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659" title="Initialize the RTOS Kernel.">osKernelInitialize</a>();                 <span class="comment">// Initialize CMSIS-RTOS</span></div>
 372 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__ThreadMgmt.html#ga48d68b8666d99d28fa646ee1d2182b8f" title="Create a thread and add it to Active Threads.">osThreadNew</a>(app_main, NULL, NULL);    <span class="comment">// Create application main thread</span></div>
 373 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221" title="Start the RTOS Kernel scheduler.">osKernelStart</a>();                      <span class="comment">// Start thread execution</span></div>
 374 <div class="line">  <span class="keywordflow">for</span> (;;) {}</div>
 375 <div class="line">}</div>
 376 </div><!-- fragment -->
 377 </div>
 378 </div>
 379 <a id="ga6f7764e7250c5c5364c00c45a5d1d199" name="ga6f7764e7250c5c5364c00c45a5d1d199"></a>
 380 <h2 class="memtitle"><span class="permalink"><a href="#ga6f7764e7250c5c5364c00c45a5d1d199">&#9670;&#160;</a></span>osKernelGetInfo()</h2>
 381
 382 <div class="memitem">
 383 <div class="memproto">
 384       <table class="memname">
 385         <tr>
 386           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osKernelGetInfo </td>
 387           <td>(</td>
 388           <td class="paramtype"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#structosVersion__t">osVersion_t</a> *&#160;</td>
 389           <td class="paramname"><em>version</em>, </td>
 390         </tr>
 391         <tr>
 392           <td class="paramkey"></td>
 393           <td></td>
 394           <td class="paramtype">char *&#160;</td>
 395           <td class="paramname"><em>id_buf</em>, </td>
 396         </tr>
 397         <tr>
 398           <td class="paramkey"></td>
 399           <td></td>
 400           <td class="paramtype">uint32_t&#160;</td>
 401           <td class="paramname"><em>id_size</em>&#160;</td>
 402         </tr>
 403         <tr>
 404           <td></td>
 405           <td>)</td>
 406           <td></td><td></td>
 407         </tr>
 408       </table>
 409 </div><div class="memdoc">
 410
 411 <p>Get RTOS Kernel Information. </p>
 412 <dl class="params"><dt>Parameters</dt><dd>
 413   <table class="params">
 414     <tr><td class="paramdir">[out]</td><td class="paramname">version</td><td>pointer to buffer for retrieving version information. </td></tr>
 415     <tr><td class="paramdir">[out]</td><td class="paramname">id_buf</td><td>pointer to buffer for retrieving kernel identification string. </td></tr>
 416     <tr><td class="paramdir">[in]</td><td class="paramname">id_size</td><td>size of buffer for kernel identification string. </td></tr>
 417   </table>
 418   </dd>
 419 </dl>
 420 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 421 <p>The function <b>osKernelGetInfo</b> retrieves the API and kernel version of the underlying RTOS kernel and a human readable identifier string for the kernel. It can be safely called before the RTOS is initialized or started (call to <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659">osKernelInitialize</a> or <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221">osKernelStart</a>).</p>
 422 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 423 <li><em>osOK</em> in case of success.</li>
 424 <li><em>osError</em> if an unspecific error occurred.</li>
 425 </ul>
 426 <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>
 427 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="keywordtype">void</span> info (<span class="keywordtype">void</span>) {</div>
 428 <div class="line">  <span class="keywordtype">char</span> infobuf[100];</div>
 429 <div class="line">  <a class="code hl_struct" href="group__CMSIS__RTOS__KernelCtrl.html#structosVersion__t" title="Version information.">osVersion_t</a> osv;</div>
 430 <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;</div>
 431 <div class="line"> </div>
 432 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga6f7764e7250c5c5364c00c45a5d1d199" title="Get RTOS Kernel Information.">osKernelGetInfo</a>(&amp;osv, infobuf, <span class="keyword">sizeof</span>(infobuf));</div>
 433 <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>
 434 <div class="line">    printf(<span class="stringliteral">&quot;Kernel Information: %s\r\n&quot;</span>, infobuf);</div>
 435 <div class="line">    printf(<span class="stringliteral">&quot;Kernel Version    : %d\r\n&quot;</span>, osv.<a class="code hl_variable" href="group__CMSIS__RTOS__KernelCtrl.html#ad8075d3f42141346ae2c56389358f9e7" title="Kernel version (major.minor.rev: mmnnnrrrr dec).">kernel</a>);</div>
 436 <div class="line">    printf(<span class="stringliteral">&quot;Kernel API Version: %d\r\n&quot;</span>, osv.<a class="code hl_variable" href="group__CMSIS__RTOS__KernelCtrl.html#a76a1ef1a4d3d9bd3e70783051f22a6d3" title="API version (major.minor.rev: mmnnnrrrr dec).">api</a>);</div>
 437 <div class="line">  }</div>
 438 <div class="line">}</div>
 439 </div><!-- fragment -->
 440 </div>
 441 </div>
 442 <a id="ga48b69b81012fce051f639be288b243ba" name="ga48b69b81012fce051f639be288b243ba"></a>
 443 <h2 class="memtitle"><span class="permalink"><a href="#ga48b69b81012fce051f639be288b243ba">&#9670;&#160;</a></span>osKernelGetState()</h2>
 444
 445 <div class="memitem">
 446 <div class="memproto">
 447       <table class="memname">
 448         <tr>
 449           <td class="memname"><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga08326469274b668140ca934b168a5ad4">osKernelState_t</a> osKernelGetState </td>
 450           <td>(</td>
 451           <td class="paramtype">void&#160;</td>
 452           <td class="paramname"></td><td>)</td>
 453           <td></td>
 454         </tr>
 455       </table>
 456 </div><div class="memdoc">
 457
 458 <p>Get the current RTOS Kernel state. </p>
 459 <dl class="section return"><dt>Returns</dt><dd>current RTOS Kernel state.</dd></dl>
 460 <p>The function <b>osKernelGetState</b> returns the current state of the kernel and can be safely called before the RTOS is initialized or started (call to <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659">osKernelInitialize</a> or <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221">osKernelStart</a>). In case it fails it will return <code>osKernelError</code>, otherwise it returns the kernel state (refer to <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga08326469274b668140ca934b168a5ad4">osKernelState_t</a> for the list of kernel states).</p>
 461 <p>Possible <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga08326469274b668140ca934b168a5ad4">osKernelState_t</a> return values:</p><ul>
 462 <li><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a0545c92c18ce8e6b24e82a0d694a0b4a">osKernelError</a> if an unspecific error occurred.</li>
 463 <li>the actual kernel state otherwise.</li>
 464 </ul>
 465 <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>
 466 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="keywordtype">int</span> main (<span class="keywordtype">void</span>) {</div>
 467 <div class="line">  <span class="comment">// System Initialization</span></div>
 468 <div class="line">  SystemCoreClockUpdate();</div>
 469 <div class="line">  <span class="comment">// ...</span></div>
 470 <div class="line">  <span class="keywordflow">if</span>(<a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga48b69b81012fce051f639be288b243ba" title="Get the current RTOS Kernel state.">osKernelGetState</a>() == <a class="code hl_enumvalue" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a2ad3e5912db47b497529d036c89e7995" title="Inactive.">osKernelInactive</a>) {     <span class="comment">// Is the kernel initialized?</span></div>
 471 <div class="line">     <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659" title="Initialize the RTOS Kernel.">osKernelInitialize</a>();                         <span class="comment">// Initialize CMSIS-RTOS kernel</span></div>
 472 <div class="line">  }</div>
 473 <div class="line">  ;</div>
 474 <div class="line">}</div>
 475 </div><!-- fragment -->
 476 </div>
 477 </div>
 478 <a id="ga9ae2cc00f0d89d7b6a307bba942b5221" name="ga9ae2cc00f0d89d7b6a307bba942b5221"></a>
 479 <h2 class="memtitle"><span class="permalink"><a href="#ga9ae2cc00f0d89d7b6a307bba942b5221">&#9670;&#160;</a></span>osKernelStart()</h2>
 480
 481 <div class="memitem">
 482 <div class="memproto">
 483       <table class="memname">
 484         <tr>
 485           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osKernelStart </td>
 486           <td>(</td>
 487           <td class="paramtype">void&#160;</td>
 488           <td class="paramname"></td><td>)</td>
 489           <td></td>
 490         </tr>
 491       </table>
 492 </div><div class="memdoc">
 493
 494 <p>Start the RTOS Kernel scheduler. </p>
 495 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 496 <p>The function <b>osKernelStart</b> starts the RTOS kernel and begins thread switching. It will not return to its calling function in case of success. Before it is successfully executed, only the functions <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga6f7764e7250c5c5364c00c45a5d1d199">osKernelGetInfo</a>, <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga48b69b81012fce051f639be288b243ba">osKernelGetState</a>, and object creation functions (<b>osXxxNew</b>) may be called.</p>
 497 <p>At least one initial thread should be created prior osKernelStart, see <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ga48d68b8666d99d28fa646ee1d2182b8f">osThreadNew</a>.</p>
 498 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 499 <li><em>osError</em> if an unspecific error occurred.</li>
 500 <li><em>osErrorISR</em> if called from an <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routine</a>.</li>
 501 </ul>
 502 <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>
 503 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="keywordtype">int</span> main (<span class="keywordtype">void</span>) {</div>
 504 <div class="line">  <span class="comment">// System Initialization</span></div>
 505 <div class="line">  SystemCoreClockUpdate();</div>
 506 <div class="line">  <span class="comment">// ...</span></div>
 507 <div class="line">  <span class="keywordflow">if</span>(<a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga48b69b81012fce051f639be288b243ba" title="Get the current RTOS Kernel state.">osKernelGetState</a>() == <a class="code hl_enumvalue" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a2ad3e5912db47b497529d036c89e7995" title="Inactive.">osKernelInactive</a>) {</div>
 508 <div class="line">    <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659" title="Initialize the RTOS Kernel.">osKernelInitialize</a>();</div>
 509 <div class="line">  }</div>
 510 <div class="line">  ; <span class="comment">// ... Start Threads</span></div>
 511 <div class="line">  <span class="keywordflow">if</span> (<a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga48b69b81012fce051f639be288b243ba" title="Get the current RTOS Kernel state.">osKernelGetState</a>() == <a class="code hl_enumvalue" href="group__CMSIS__RTOS__KernelCtrl.html#gga08326469274b668140ca934b168a5ad4a0596c6e14113447604753656417c9a24" title="Ready.">osKernelReady</a>) {        <span class="comment">// If kernel is ready to run...</span></div>
 512 <div class="line">    <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221" title="Start the RTOS Kernel scheduler.">osKernelStart</a>();                                <span class="comment">// ... start thread execution</span></div>
 513 <div class="line">    }</div>
 514 <div class="line">  </div>
 515 <div class="line">  <span class="keywordflow">while</span>(1);                                         <span class="comment">// only reached in case of error</span></div>
 516 <div class="line">}</div>
 517 </div><!-- fragment -->
 518 </div>
 519 </div>
 520 <a id="ga948609ee930d9b38336b9e1c2a4dfe12" name="ga948609ee930d9b38336b9e1c2a4dfe12"></a>
 521 <h2 class="memtitle"><span class="permalink"><a href="#ga948609ee930d9b38336b9e1c2a4dfe12">&#9670;&#160;</a></span>osKernelLock()</h2>
 522
 523 <div class="memitem">
 524 <div class="memproto">
 525       <table class="memname">
 526         <tr>
 527           <td class="memname">int32_t osKernelLock </td>
 528           <td>(</td>
 529           <td class="paramtype">void&#160;</td>
 530           <td class="paramname"></td><td>)</td>
 531           <td></td>
 532         </tr>
 533       </table>
 534 </div><div class="memdoc">
 535
 536 <p>Lock the RTOS Kernel scheduler. </p>
 537 <dl class="section return"><dt>Returns</dt><dd>previous lock state (1 - locked, 0 - not locked, error code if negative).</dd></dl>
 538 <p>The function <b>osKernelLock</b> allows to lock all task switches. It returns the previous value of the lock state (<span class="XML-Token">1</span> if it was locked, <span class="XML-Token">0</span> if it was unlocked), or a negative number representing an error code otherwise (refer to <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>).</p>
 539 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 540 <li><em>osError</em> if an unspecific error occurred.</li>
 541 <li><em>osErrorISR</em> if called from an <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routine</a>.</li>
 542 <li><em>osErrorSafetyClass</em> if the calling thread safety class is lower than the kernel protect safety class.</li>
 543 </ul>
 544 <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>
 545 <p><b>Code Example</b> </p><div class="fragment"><div class="line">int32_t state = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12" title="Lock the RTOS Kernel scheduler.">osKernelLock</a>();</div>
 546 <div class="line"><span class="comment">// ... critical code</span></div>
 547 <div class="line">osKernelRestore(state);</div>
 548 </div><!-- fragment -->
 549 </div>
 550 </div>
 551 <a id="gaf401728b4657456198c33fe75f8d6720" name="gaf401728b4657456198c33fe75f8d6720"></a>
 552 <h2 class="memtitle"><span class="permalink"><a href="#gaf401728b4657456198c33fe75f8d6720">&#9670;&#160;</a></span>osKernelUnlock()</h2>
 553
 554 <div class="memitem">
 555 <div class="memproto">
 556       <table class="memname">
 557         <tr>
 558           <td class="memname">int32_t osKernelUnlock </td>
 559           <td>(</td>
 560           <td class="paramtype">void&#160;</td>
 561           <td class="paramname"></td><td>)</td>
 562           <td></td>
 563         </tr>
 564       </table>
 565 </div><div class="memdoc">
 566
 567 <p>Unlock the RTOS Kernel scheduler. </p>
 568 <dl class="section return"><dt>Returns</dt><dd>previous lock state (1 - locked, 0 - not locked, error code if negative).</dd></dl>
 569 <p>The function <b>osKernelUnlock</b> resumes from <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12">osKernelLock</a>. It returns the previous value of the lock state (<span class="XML-Token">1</span> if it was locked, <span class="XML-Token">0</span> if it was unlocked), or a negative number representing an error code otherwise (refer to <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>).</p>
 570 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 571 <li><em>osError</em> if an unspecific error occurred.</li>
 572 <li><em>osErrorISR</em> if called from an <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routine</a>.</li>
 573 </ul>
 574 <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>
 575 <p><b>Code Example</b> </p><div class="fragment"><div class="line">int32_t sl = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12" title="Lock the RTOS Kernel scheduler.">osKernelLock</a>();</div>
 576 <div class="line"><span class="comment">// ... critical code</span></div>
 577 <div class="line">{</div>
 578 <div class="line">  int32_t su = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720" title="Unlock the RTOS Kernel scheduler.">osKernelUnlock</a>();</div>
 579 <div class="line">  <span class="comment">// ... uncritical code</span></div>
 580 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae7d0a71b9586cbbb49fcbdf6a04f0289" title="Restore the RTOS Kernel scheduler lock state.">osKernelRestoreLock</a>(su);</div>
 581 <div class="line">}</div>
 582 <div class="line"><span class="comment">// ... critical code</span></div>
 583 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae7d0a71b9586cbbb49fcbdf6a04f0289" title="Restore the RTOS Kernel scheduler lock state.">osKernelRestoreLock</a>(sl);</div>
 584 </div><!-- fragment -->
 585 </div>
 586 </div>
 587 <a id="gae7d0a71b9586cbbb49fcbdf6a04f0289" name="gae7d0a71b9586cbbb49fcbdf6a04f0289"></a>
 588 <h2 class="memtitle"><span class="permalink"><a href="#gae7d0a71b9586cbbb49fcbdf6a04f0289">&#9670;&#160;</a></span>osKernelRestoreLock()</h2>
 589
 590 <div class="memitem">
 591 <div class="memproto">
 592       <table class="memname">
 593         <tr>
 594           <td class="memname">int32_t osKernelRestoreLock </td>
 595           <td>(</td>
 596           <td class="paramtype">int32_t&#160;</td>
 597           <td class="paramname"><em>lock</em></td><td>)</td>
 598           <td></td>
 599         </tr>
 600       </table>
 601 </div><div class="memdoc">
 602
 603 <p>Restore the RTOS Kernel scheduler lock state. </p>
 604 <dl class="params"><dt>Parameters</dt><dd>
 605   <table class="params">
 606     <tr><td class="paramdir">[in]</td><td class="paramname">lock</td><td>lock state obtained by <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12">osKernelLock</a> or <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720">osKernelUnlock</a>. </td></tr>
 607   </table>
 608   </dd>
 609 </dl>
 610 <dl class="section return"><dt>Returns</dt><dd>new lock state (1 - locked, 0 - not locked, error code if negative).</dd></dl>
 611 <p>The function <b>osKernelRestoreLock</b> restores the previous lock state after <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12">osKernelLock</a> or <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720">osKernelUnlock</a>.</p>
 612 <p>The argument <em>lock</em> specifies the lock state as obtained by <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12">osKernelLock</a> or <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720">osKernelUnlock</a>.</p>
 613 <p>The function returns the new value of the lock state (<span class="XML-Token">1</span> if it was locked, <span class="XML-Token">0</span> if it was unlocked), or a negative number representing an error code otherwise (refer to <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a>).</p>
 614 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 615 <li><em>osError</em> if an unspecific error occurred.</li>
 616 <li><em>osErrorISR</em> if called from interrupt other than fault or <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ga5a02770aaf65c7a3c7562c109884176a">osWatchdogAlarm_Handler</a>.</li>
 617 <li><em>osErrorSafetyClass</em> if the calling thread safety class is lower than the kernel protect safety class.</li>
 618 </ul>
 619 <p><b>Code Example</b> </p><div class="fragment"><div class="line">int32_t sl = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12" title="Lock the RTOS Kernel scheduler.">osKernelLock</a>();</div>
 620 <div class="line"><span class="comment">// ... critical code</span></div>
 621 <div class="line">{</div>
 622 <div class="line">  int32_t su = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720" title="Unlock the RTOS Kernel scheduler.">osKernelUnlock</a>();</div>
 623 <div class="line">  <span class="comment">// ... uncritical code</span></div>
 624 <div class="line">  <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae7d0a71b9586cbbb49fcbdf6a04f0289" title="Restore the RTOS Kernel scheduler lock state.">osKernelRestoreLock</a>(su);</div>
 625 <div class="line">}</div>
 626 <div class="line"><span class="comment">// ... critical code</span></div>
 627 <div class="line"><a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae7d0a71b9586cbbb49fcbdf6a04f0289" title="Restore the RTOS Kernel scheduler lock state.">osKernelRestoreLock</a>(sl);</div>
 628 </div><!-- fragment -->
 629 </div>
 630 </div>
 631 <a id="gae26683e1606ec633354a2876c68f0c1f" name="gae26683e1606ec633354a2876c68f0c1f"></a>
 632 <h2 class="memtitle"><span class="permalink"><a href="#gae26683e1606ec633354a2876c68f0c1f">&#9670;&#160;</a></span>osKernelSuspend()</h2>
 633
 634 <div class="memitem">
 635 <div class="memproto">
 636       <table class="memname">
 637         <tr>
 638           <td class="memname">uint32_t osKernelSuspend </td>
 639           <td>(</td>
 640           <td class="paramtype">void&#160;</td>
 641           <td class="paramname"></td><td>)</td>
 642           <td></td>
 643         </tr>
 644       </table>
 645 </div><div class="memdoc">
 646
 647 <p>Suspend the RTOS Kernel scheduler. </p>
 648 <dl class="section return"><dt>Returns</dt><dd>time in ticks, for how long the system can sleep or power-down.</dd></dl>
 649 <p>CMSIS-RTOS2 provides extension for tick-less operation which is useful for applications that use extensively low-power modes where the SysTick timer is also disabled.</p>
 650 <p>To provide a time-tick in such power-saving modes a wake-up timer is used to derive timer intervals. The function <b>osKernelSuspend</b> suspends the RTOS kernel scheduler and thus enables sleep modes.</p>
 651 <p>The return value can be used to determine the amount of system ticks until the next tick-based kernel event will occur, i.e. a delayed thread becomes ready again. It is recommended to set up the low power timer to generate a wake-up interrupt based on this return value.</p>
 652 <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>
 653 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="keywordtype">void</span> osRtxIdleThread (<span class="keywordtype">void</span>) {</div>
 654 <div class="line">                                               <span class="comment">/* The idle thread is running</span></div>
 655 <div class="line"><span class="comment">                                                  when no other thread is ready</span></div>
 656 <div class="line"><span class="comment">                                                  to run.                      */</span></div>
 657 <div class="line">  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sleep;</div>
 658 <div class="line"> </div>
 659 <div class="line">  <span class="keywordflow">for</span> (;;) {</div>
 660 <div class="line">                                               <span class="comment">/* HERE: include optional user</span></div>
 661 <div class="line"><span class="comment">                                                  code to be executed when no</span></div>
 662 <div class="line"><span class="comment">                                                  task runs.                   */</span></div>
 663 <div class="line">    sleep = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae26683e1606ec633354a2876c68f0c1f" title="Suspend the RTOS Kernel scheduler.">osKernelSuspend</a>();                 <span class="comment">/* Suspend RTOS kernel scheduler */</span></div>
 664 <div class="line"> </div>
 665 <div class="line">    <span class="keywordflow">if</span> (sleep) {                               <span class="comment">/* How long can we sleep?       */</span></div>
 666 <div class="line">                                               <span class="comment">/* &quot;sleep&quot; is in kernel Timer Ticks</span></div>
 667 <div class="line"><span class="comment">                                                  which is 1ms in this</span></div>
 668 <div class="line"><span class="comment">                                                  configuration                */</span></div>
 669 <div class="line">       </div>
 670 <div class="line">                                               <span class="comment">/* Setup wake-up e.g. watchdog  */</span></div>
 671 <div class="line"> </div>
 672 <div class="line">      __WFE();                                 <span class="comment">/* Enter Power-down mode        */</span></div>
 673 <div class="line">      </div>
 674 <div class="line">                                               <span class="comment">/* After Wake-up                */</span></div>
 675 <div class="line">      sleep = tc;                              <span class="comment">/* Adjust with cycles slept     */</span>  </div>
 676 <div class="line">    }</div>
 677 <div class="line"> </div>
 678 <div class="line">    <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga8c4b4d7ed34cab73c001665d9176aced" title="Resume the RTOS Kernel scheduler.">osKernelResume</a>(sleep);                     <span class="comment">/* Resume thread scheduler      */</span></div>
 679 <div class="line">  }</div>
 680 <div class="line">}</div>
 681 </div><!-- fragment -->
 682 </div>
 683 </div>
 684 <a id="ga8c4b4d7ed34cab73c001665d9176aced" name="ga8c4b4d7ed34cab73c001665d9176aced"></a>
 685 <h2 class="memtitle"><span class="permalink"><a href="#ga8c4b4d7ed34cab73c001665d9176aced">&#9670;&#160;</a></span>osKernelResume()</h2>
 686
 687 <div class="memitem">
 688 <div class="memproto">
 689       <table class="memname">
 690         <tr>
 691           <td class="memname">void osKernelResume </td>
 692           <td>(</td>
 693           <td class="paramtype">uint32_t&#160;</td>
 694           <td class="paramname"><em>sleep_ticks</em></td><td>)</td>
 695           <td></td>
 696         </tr>
 697       </table>
 698 </div><div class="memdoc">
 699
 700 <p>Resume the RTOS Kernel scheduler. </p>
 701 <dl class="params"><dt>Parameters</dt><dd>
 702   <table class="params">
 703     <tr><td class="paramdir">[in]</td><td class="paramname">sleep_ticks</td><td>time in ticks for how long the system was in sleep or power-down mode.</td></tr>
 704   </table>
 705   </dd>
 706 </dl>
 707 <p>CMSIS-RTOS provides extension for tick-less operation which is useful for applications that use extensively low-power modes where the SysTick timer is also disabled.</p>
 708 <p>To provide a time-tick in such power-saving modes a wake-up timer is used to derive timer intervals. The function <b>osKernelResume</b> enables the RTOS kernel scheduler and thus wakes up the system from sleep mode.</p>
 709 <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>
 710 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="keywordtype">void</span> osRtxIdleThread (<span class="keywordtype">void</span>) {</div>
 711 <div class="line">                                               <span class="comment">/* The idle thread is running</span></div>
 712 <div class="line"><span class="comment">                                                  when no other thread is ready</span></div>
 713 <div class="line"><span class="comment">                                                  to run.                      */</span></div>
 714 <div class="line">  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> sleep;</div>
 715 <div class="line"> </div>
 716 <div class="line">  <span class="keywordflow">for</span> (;;) {</div>
 717 <div class="line">                                               <span class="comment">/* HERE: include optional user</span></div>
 718 <div class="line"><span class="comment">                                                  code to be executed when no</span></div>
 719 <div class="line"><span class="comment">                                                  task runs.                   */</span></div>
 720 <div class="line">    sleep = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae26683e1606ec633354a2876c68f0c1f" title="Suspend the RTOS Kernel scheduler.">osKernelSuspend</a>();                 <span class="comment">/* Suspend RTOS kernel scheduler */</span></div>
 721 <div class="line"> </div>
 722 <div class="line">    <span class="keywordflow">if</span> (sleep) {                               <span class="comment">/* How long can we sleep?       */</span></div>
 723 <div class="line">                                               <span class="comment">/* &quot;sleep&quot; is in Kernel Timer Ticks</span></div>
 724 <div class="line"><span class="comment">                                                  which is 1ms in this</span></div>
 725 <div class="line"><span class="comment">                                                  configuration                */</span></div>
 726 <div class="line">       </div>
 727 <div class="line">                                               <span class="comment">/* Setup wake-up e.g. watchdog  */</span></div>
 728 <div class="line"> </div>
 729 <div class="line">      __WFE();                                 <span class="comment">/* Enter Power-down mode        */</span></div>
 730 <div class="line">      </div>
 731 <div class="line">                                               <span class="comment">/* After Wake-up                */</span></div>
 732 <div class="line">      sleep = tc;                              <span class="comment">/* Adjust with cycles slept     */</span>  </div>
 733 <div class="line">    }</div>
 734 <div class="line"> </div>
 735 <div class="line">    <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga8c4b4d7ed34cab73c001665d9176aced" title="Resume the RTOS Kernel scheduler.">osKernelResume</a>(sleep);                     <span class="comment">/* Resume thread scheduler      */</span></div>
 736 <div class="line">  }</div>
 737 <div class="line">}</div>
 738 </div><!-- fragment -->
 739 </div>
 740 </div>
 741 <a id="ga84bcdbf2fb76b10c8df4e439f0c7e11b" name="ga84bcdbf2fb76b10c8df4e439f0c7e11b"></a>
 742 <h2 class="memtitle"><span class="permalink"><a href="#ga84bcdbf2fb76b10c8df4e439f0c7e11b">&#9670;&#160;</a></span>osKernelGetTickCount()</h2>
 743
 744 <div class="memitem">
 745 <div class="memproto">
 746       <table class="memname">
 747         <tr>
 748           <td class="memname">uint32_t osKernelGetTickCount </td>
 749           <td>(</td>
 750           <td class="paramtype">void&#160;</td>
 751           <td class="paramname"></td><td>)</td>
 752           <td></td>
 753         </tr>
 754       </table>
 755 </div><div class="memdoc">
 756
 757 <p>Get the RTOS kernel tick count. </p>
 758 <dl class="section return"><dt>Returns</dt><dd>RTOS kernel current tick count.</dd></dl>
 759 <p>The function <b>osKernelGetTickCount</b> returns the current RTOS kernel tick count.</p>
 760 <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>
 761 <p><b>Code</b> <b>Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 762 <div class="line"> </div>
 763 <div class="line"><span class="keywordtype">void</span> Thread_1 (<span class="keywordtype">void</span> *arg)  {                <span class="comment">// Thread function</span></div>
 764 <div class="line">  uint32_t tick;</div>
 765 <div class="line"> </div>
 766 <div class="line">  tick = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b" title="Get the RTOS kernel tick count.">osKernelGetTickCount</a>();            <span class="comment">// retrieve the number of system ticks</span></div>
 767 <div class="line">  <span class="keywordflow">for</span> (;;) {</div>
 768 <div class="line">    tick += 1000;                           <span class="comment">// delay 1000 ticks periodically</span></div>
 769 <div class="line">    <a class="code hl_function" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1" title="Wait until specified time.">osDelayUntil</a>(tick);</div>
 770 <div class="line">    <span class="comment">// ...</span></div>
 771 <div class="line">  }</div>
 772 <div class="line">}</div>
 773 </div><!-- fragment --><p>Due to the limited value range used for the tick count it may overflow during runtime, i.e. after 2<sup>32</sup> ticks which are roughly 49days @ 1ms. Typically one has not to take special care of this unless a monotonic counter is needed. For such a case an additional 64bit tick counter can be implemented as follows. The given example needs GetTick() called at least twice per tick overflow to work properly.</p>
 774 <p><b>Code</b> <b>Example</b> </p><div class="fragment"><div class="line">uint64_t GetTick(<span class="keywordtype">void</span>) {</div>
 775 <div class="line">  <span class="keyword">static</span> uint32_t tick_h = 0U;</div>
 776 <div class="line">  <span class="keyword">static</span> uint32_t tick_l = 0U;</div>
 777 <div class="line">         uint32_t tick;</div>
 778 <div class="line"> </div>
 779 <div class="line">  tick = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b" title="Get the RTOS kernel tick count.">osKernelGetTickCount</a>();</div>
 780 <div class="line">  <span class="keywordflow">if</span> (tick &lt; tick_l) {</div>
 781 <div class="line">    tick_h++;</div>
 782 <div class="line">  }</div>
 783 <div class="line">  tick_l = tick;</div>
 784 <div class="line"> </div>
 785 <div class="line">  <span class="keywordflow">return</span> (((uint64_t)tick_h &lt;&lt; 32) | tick_l);</div>
 786 <div class="line">}</div>
 787 </div><!-- fragment -->
 788 </div>
 789 </div>
 790 <a id="ga7a8d7bd927eaaa58999f91d7d6310cee" name="ga7a8d7bd927eaaa58999f91d7d6310cee"></a>
 791 <h2 class="memtitle"><span class="permalink"><a href="#ga7a8d7bd927eaaa58999f91d7d6310cee">&#9670;&#160;</a></span>osKernelGetTickFreq()</h2>
 792
 793 <div class="memitem">
 794 <div class="memproto">
 795       <table class="memname">
 796         <tr>
 797           <td class="memname">uint32_t osKernelGetTickFreq </td>
 798           <td>(</td>
 799           <td class="paramtype">void&#160;</td>
 800           <td class="paramname"></td><td>)</td>
 801           <td></td>
 802         </tr>
 803       </table>
 804 </div><div class="memdoc">
 805
 806 <p>Get the RTOS kernel tick frequency. </p>
 807 <dl class="section return"><dt>Returns</dt><dd>frequency of the kernel tick in hertz, i.e. kernel ticks per second.</dd></dl>
 808 <p>The function <b>osKernelGetTickFreq</b> returns the frequency of the current RTOS kernel tick.</p>
 809 <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>
 810
 811 </div>
 812 </div>
 813 <a id="gae0fcaff6cecfb4013bb556c87afcd7d2" name="gae0fcaff6cecfb4013bb556c87afcd7d2"></a>
 814 <h2 class="memtitle"><span class="permalink"><a href="#gae0fcaff6cecfb4013bb556c87afcd7d2">&#9670;&#160;</a></span>osKernelGetSysTimerCount()</h2>
 815
 816 <div class="memitem">
 817 <div class="memproto">
 818       <table class="memname">
 819         <tr>
 820           <td class="memname">uint32_t osKernelGetSysTimerCount </td>
 821           <td>(</td>
 822           <td class="paramtype">void&#160;</td>
 823           <td class="paramname"></td><td>)</td>
 824           <td></td>
 825         </tr>
 826       </table>
 827 </div><div class="memdoc">
 828
 829 <p>Get the RTOS kernel system timer count. </p>
 830 <dl class="section return"><dt>Returns</dt><dd>RTOS kernel current system timer count as 32-bit value.</dd></dl>
 831 <p>The function <b>osKernelGetSysTimerCount</b> returns the current RTOS kernel system timer as a 32-bit value. The value is a rolling 32-bit counter that is composed of the kernel system interrupt timer value and the counter that counts these interrupts (RTOS kernel ticks).</p>
 832 <p>This function allows the implementation of very short timeout checks below the RTOS tick granularity. Such checks might be required when checking for a busy status in a device or peripheral initialization routine, see code example below.</p>
 833 <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>
 834 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 835 <div class="line"> </div>
 836 <div class="line"><span class="keywordtype">void</span> SetupDevice (<span class="keywordtype">void</span>)  {</div>
 837 <div class="line">  uint32_t tick;</div>
 838 <div class="line">  </div>
 839 <div class="line">  <span class="comment">// Calculating 100us timeout in system timer ticks</span></div>
 840 <div class="line">  <span class="keyword">const</span> uint32_t timeout = 100U * <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga4d69215a93220f72be3684cad582f16a" title="Get the RTOS kernel system timer frequency.">osKernelGetSysTimerFreq</a>() / 1000000u;</div>
 841 <div class="line">  </div>
 842 <div class="line">  tick = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae0fcaff6cecfb4013bb556c87afcd7d2" title="Get the RTOS kernel system timer count.">osKernelGetSysTimerCount</a>();             <span class="comment">// get start value of the Kernel system tick</span></div>
 843 <div class="line">  Device.Setup ();                               <span class="comment">// initialize a device or peripheral</span></div>
 844 <div class="line">  <span class="keywordflow">do</span> {                                           <span class="comment">// poll device busy status for 100 microseconds</span></div>
 845 <div class="line">    <span class="keywordflow">if</span> (!Device.Busy) <span class="keywordflow">break</span>;                     <span class="comment">// check if device is correctly initialized</span></div>
 846 <div class="line">  } <span class="keywordflow">while</span> ((<a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gae0fcaff6cecfb4013bb556c87afcd7d2" title="Get the RTOS kernel system timer count.">osKernelGetSysTimerCount</a>() - tick) &lt; timeout));</div>
 847 <div class="line">  <span class="keywordflow">if</span> (Device.Busy)  {              </div>
 848 <div class="line">    ;                                            <span class="comment">// in case device still busy, signal error</span></div>
 849 <div class="line">  }</div>
 850 <div class="line">                                                 <span class="comment">// start interacting with device</span></div>
 851 <div class="line">}</div>
 852 </div><!-- fragment -->
 853 </div>
 854 </div>
 855 <a id="ga4d69215a93220f72be3684cad582f16a" name="ga4d69215a93220f72be3684cad582f16a"></a>
 856 <h2 class="memtitle"><span class="permalink"><a href="#ga4d69215a93220f72be3684cad582f16a">&#9670;&#160;</a></span>osKernelGetSysTimerFreq()</h2>
 857
 858 <div class="memitem">
 859 <div class="memproto">
 860       <table class="memname">
 861         <tr>
 862           <td class="memname">uint32_t osKernelGetSysTimerFreq </td>
 863           <td>(</td>
 864           <td class="paramtype">void&#160;</td>
 865           <td class="paramname"></td><td>)</td>
 866           <td></td>
 867         </tr>
 868       </table>
 869 </div><div class="memdoc">
 870
 871 <p>Get the RTOS kernel system timer frequency. </p>
 872 <dl class="section return"><dt>Returns</dt><dd>frequency of the system timer in hertz, i.e. timer ticks per second.</dd></dl>
 873 <p>The function <b>osKernelGetSysTimerFreq</b> returns the frequency of the current RTOS kernel system timer.</p>
 874 <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>
 875
 876 </div>
 877 </div>
 878 <a id="gac7e3b012c15c55bda68e0dd96ad9cd72" name="gac7e3b012c15c55bda68e0dd96ad9cd72"></a>
 879 <h2 class="memtitle"><span class="permalink"><a href="#gac7e3b012c15c55bda68e0dd96ad9cd72">&#9670;&#160;</a></span>osKernelProtect()</h2>
 880
 881 <div class="memitem">
 882 <div class="memproto">
 883       <table class="memname">
 884         <tr>
 885           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osKernelProtect </td>
 886           <td>(</td>
 887           <td class="paramtype">uint32_t&#160;</td>
 888           <td class="paramname"><em>safety_class</em></td><td>)</td>
 889           <td></td>
 890         </tr>
 891       </table>
 892 </div><div class="memdoc">
 893
 894 <p>Protect the RTOS Kernel scheduler access. </p>
 895 <dl class="params"><dt>Parameters</dt><dd>
 896   <table class="params">
 897     <tr><td class="paramdir">[in]</td><td class="paramname">safety_class</td><td>safety class. </td></tr>
 898   </table>
 899   </dd>
 900 </dl>
 901 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 902 <p>The function <b>osKernelProtect</b> configures kernel access protection. After its successful execution, only threads with safety class equal or higher than the <em>safety_class</em> specified in the argument can execute kernel control functions.</p><ul>
 903 <li><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga948609ee930d9b38336b9e1c2a4dfe12">osKernelLock</a></li>
 904 <li><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gaf401728b4657456198c33fe75f8d6720">osKernelUnlock</a></li>
 905 <li><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae7d0a71b9586cbbb49fcbdf6a04f0289">osKernelRestoreLock</a></li>
 906 <li><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gae26683e1606ec633354a2876c68f0c1f">osKernelSuspend</a></li>
 907 <li><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga8c4b4d7ed34cab73c001665d9176aced">osKernelResume</a></li>
 908 <li><a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#gac7e3b012c15c55bda68e0dd96ad9cd72">osKernelProtect</a></li>
 909 </ul>
 910 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 911 <li><em>osOK</em> in case of success.</li>
 912 <li><em>osErrorParameter</em> if <em>safety_class</em> is invalid.</li>
 913 <li><em>osError</em> if kernel is not in ready or running state.</li>
 914 <li><em>osErrorISR</em> if called from an <a class="el" href="usingOS2.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routine</a>.</li>
 915 <li><em>osErrorSafetyClass</em> if the calling thread safety class is lower than the kernel protect safety class.</li>
 916 </ul>
 917 <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>
 918 <p><b>Code Example:</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 919 <div class="line"> </div>
 920 <div class="line"><span class="keywordtype">void</span> ProtectKernelControlFunctions (<span class="keywordtype">void</span>) {</div>
 921 <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;</div>
 922 <div class="line"> </div>
 923 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#gac7e3b012c15c55bda68e0dd96ad9cd72" title="Protect the RTOS Kernel scheduler access.">osKernelProtect</a>(4U); <span class="comment">// Enable Kernel Control for threads with safety class 4 or higher</span></div>
 924 <div class="line">  <span class="comment">// verify status value here.</span></div>
 925 <div class="line">}</div>
 926 </div><!-- fragment -->
 927 </div>
 928 </div>
 929 <a id="ga2065364d1bc805a40e749430377df1e1" name="ga2065364d1bc805a40e749430377df1e1"></a>
 930 <h2 class="memtitle"><span class="permalink"><a href="#ga2065364d1bc805a40e749430377df1e1">&#9670;&#160;</a></span>osKernelDestroyClass()</h2>
 931
 932 <div class="memitem">
 933 <div class="memproto">
 934       <table class="memname">
 935         <tr>
 936           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osKernelDestroyClass </td>
 937           <td>(</td>
 938           <td class="paramtype">uint32_t&#160;</td>
 939           <td class="paramname"><em>safety_class</em>, </td>
 940         </tr>
 941         <tr>
 942           <td class="paramkey"></td>
 943           <td></td>
 944           <td class="paramtype">uint32_t&#160;</td>
 945           <td class="paramname"><em>mode</em>&#160;</td>
 946         </tr>
 947         <tr>
 948           <td></td>
 949           <td>)</td>
 950           <td></td><td></td>
 951         </tr>
 952       </table>
 953 </div><div class="memdoc">
 954
 955 <p>Destroy objects for specified safety classes. </p>
 956 <dl class="params"><dt>Parameters</dt><dd>
 957   <table class="params">
 958     <tr><td class="paramdir">[in]</td><td class="paramname">safety_class</td><td>safety class. </td></tr>
 959     <tr><td class="paramdir">[in]</td><td class="paramname">mode</td><td>safety mode. </td></tr>
 960   </table>
 961   </dd>
 962 </dl>
 963 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 964 <p>The function <b>osKernelDestroyClass</b> destroys RTOS objects based on safety class assignment. <em>safety_class</em> provides the reference safety class value, while <em>mode</em> is considered as a bitmap that additionally specifies the safety classes to be destroyed.</p>
 965 <p>If <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga7abd2d95425d9e02672778b3464b2eaa">osSafetyWithSameClass</a> is set in <em>mode</em> than the RTOS objects with safety class value equal to <em>safety_class</em> will be destroyed. <br  />
 966  If <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga8c77ee126b9215425fc004ee13cdc6de">osSafetyWithLowerClass</a> is set in <em>mode</em> than the RTOS objects with safety class value lower than <em>safety_class</em> will be destroyed.</p>
 967 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 968 <li><em>osOK</em> in case of success.</li>
 969 <li><em>osErrorParameter</em> if <em>safety_class</em> is invalid.</li>
 970 <li><em>osErrorResource</em> if no other <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> thread exists.</li>
 971 <li><em>osErrorISR</em> if called from interrupt other than <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ga5a02770aaf65c7a3c7562c109884176a">osWatchdogAlarm_Handler</a>.</li>
 972 <li><em>osErrorSafetyClass</em> if the calling thread safety class is lower than the kernel protect safety class.</li>
 973 </ul>
 974 <p><b>Code Example:</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;cmsis_os2.h&quot;</span></div>
 975 <div class="line"> </div>
 976 <div class="line"><span class="keywordtype">void</span> DestroyNonCriticalClasses (<span class="keywordtype">void</span>) {</div>
 977 <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;</div>
 978 <div class="line"> </div>
 979 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga2065364d1bc805a40e749430377df1e1" title="Destroy objects for specified safety classes.">osKernelDestroyClass</a>(4U, <a class="code hl_define" href="group__CMSIS__RTOS__Definitions.html#ga7abd2d95425d9e02672778b3464b2eaa" title="Objects with same safety class.">osSafetyWithSameClass</a> | <a class="code hl_define" href="group__CMSIS__RTOS__Definitions.html#ga8c77ee126b9215425fc004ee13cdc6de" title="Objects with lower safety class.">osSafetyWithLowerClass</a>); <span class="comment">// Destroy objects with safety class 4 or lower</span></div>
 980 <div class="line">  <span class="comment">// verify status value here.</span></div>
 981 <div class="line">}</div>
 982 </div><!-- fragment -->
 983 </div>
 984 </div>
 985 <a id="ga91b400b21a9093f7751fc45613c12110" name="ga91b400b21a9093f7751fc45613c12110"></a>
 986 <h2 class="memtitle"><span class="permalink"><a href="#ga91b400b21a9093f7751fc45613c12110">&#9670;&#160;</a></span>osFaultResume()</h2>
 987
 988 <div class="memitem">
 989 <div class="memproto">
 990       <table class="memname">
 991         <tr>
 992           <td class="memname">void osFaultResume </td>
 993           <td>(</td>
 994           <td class="paramtype">void&#160;</td>
 995           <td class="paramname"></td><td>)</td>
 996           <td></td>
 997         </tr>
 998       </table>
 999 </div><div class="memdoc">
1000
1001 <p>Resume normal operation when exiting exception faults. </p>
1002 <p>Resume normal RTOS operation when exiting exception faults.</p>
1003 <p><b>Code Example:</b> </p><div class="fragment"><div class="line"><span class="keywordtype">void</span> HardFault_Handler (<span class="keywordtype">void</span>) {</div>
1004 <div class="line">  __ASM <span class="keyword">volatile</span> (</div>
1005 <div class="line">    <span class="stringliteral">&quot;...                          \n\t&quot;</span> <span class="comment">// Enter assembly and handle faults</span></div>
1006 <div class="line">    <span class="stringliteral">&quot;...                          \n\t&quot;</span></div>
1007 <div class="line">    <span class="stringliteral">&quot;ldr  r0,=osFaultResume       \n\t&quot;</span> <span class="comment">// Before exiting the handler load and</span></div>
1008 <div class="line">    <span class="stringliteral">&quot;bx   r0                      \n\t&quot;</span> <span class="comment">// jump to osFaultResume</span></div>
1009 <div class="line">  );</div>
1010 <div class="line">}</div>
1011 </div><!-- fragment -->
1012 </div>
1013 </div>
1014 </div><!-- contents -->
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