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

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 131 <a href="#func-members">Functions</a>  </div>
 132   <div class="headertitle"><div class="title">Generic Wait Functions<div class="ingroups"><a class="el" href="group__CMSIS__RTOS.html">CMSIS-RTOS API v2</a></div></div></div>
 133 </div><!--header-->
 134 <div class="contents">
 135
 136 <p>Wait for a certain period of time.
 137 <a href="#details">More...</a></p>
 138 <table class="memberdecls">
 139 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
 140 Functions</h2></td></tr>
 141 <tr class="memitem:gaf6055a51390ef65b6b6edc28bf47322e"><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__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a> (uint32_t ticks)</td></tr>
 142 <tr class="memdesc:gaf6055a51390ef65b6b6edc28bf47322e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wait for Timeout (Time Delay).  <br /></td></tr>
 143 <tr class="separator:gaf6055a51390ef65b6b6edc28bf47322e"><td class="memSeparator" colspan="2">&#160;</td></tr>
 144 <tr class="memitem:ga3c807924c2d6d43bc2ffb49da3f7f3a1"><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__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a> (uint32_t ticks)</td></tr>
 145 <tr class="memdesc:ga3c807924c2d6d43bc2ffb49da3f7f3a1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wait until specified time.  <br /></td></tr>
 146 <tr class="separator:ga3c807924c2d6d43bc2ffb49da3f7f3a1"><td class="memSeparator" colspan="2">&#160;</td></tr>
 147 </table>
 148 <a name="details" id="details"></a><h2 class="groupheader">Description</h2>
 149 <p>The generic wait functions provide means for a time delay.</p>
 150 <dl class="section note"><dt>Note</dt><dd>Generic wait functions cannot be called from Interrupt Service Routines. </dd></dl>
 151 <h2 class="groupheader">Function Documentation</h2>
 152 <a id="gaf6055a51390ef65b6b6edc28bf47322e" name="gaf6055a51390ef65b6b6edc28bf47322e"></a>
 153 <h2 class="memtitle"><span class="permalink"><a href="#gaf6055a51390ef65b6b6edc28bf47322e">&#9670;&#160;</a></span>osDelay()</h2>
 154
 155 <div class="memitem">
 156 <div class="memproto">
 157       <table class="memname">
 158         <tr>
 159           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osDelay </td>
 160           <td>(</td>
 161           <td class="paramtype">uint32_t&#160;</td>
 162           <td class="paramname"><em>ticks</em></td><td>)</td>
 163           <td></td>
 164         </tr>
 165       </table>
 166 </div><div class="memdoc">
 167 <dl class="params"><dt>Parameters</dt><dd>
 168   <table class="params">
 169     <tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td>time ticks value </td></tr>
 170   </table>
 171   </dd>
 172 </dl>
 173 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 174 <p>The function <b>osDelay</b> waits for a time period specified in kernel <em>ticks</em>. For a value of <span class="XML-Token">1</span> the system waits until the next timer tick occurs. The actual time delay may be up to one timer tick less than specified, i.e. calling <code>osDelay(1)</code> right before the next system tick occurs the thread is rescheduled immediately.</p>
 175 <p>The delayed thread is put into the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">BLOCKED</a> state and a context switch occurs immediately. The thread is automatically put back to the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state after the given amount of ticks has elapsed. If the thread will have the highest priority in <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state it will be scheduled immediately.</p>
 176 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 177 <li><em>osOK:</em> the time delay is executed.</li>
 178 <li><em>osErrorParameter:</em> the time cannot be handled (zero value).</li>
 179 <li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a> cannot be called from Interrupt Service Routines.</li>
 180 <li><em>osError:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a> cannot be executed (kernel not running or no <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> thread exists).</li>
 181 </ul>
 182 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from Interrupt Service Routines.</dd></dl>
 183 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
 184 <div class="line"> </div>
 185 <div class="line"><span class="keywordtype">void</span> Thread_1 (<span class="keywordtype">void</span> *arg) {             <span class="comment">// Thread function</span></div>
 186 <div class="line">  <a class="code hl_enumeration" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> status;                    <span class="comment">// capture the return status</span></div>
 187 <div class="line">  uint32_t   delayTime;                 <span class="comment">// delay time in milliseconds</span></div>
 188 <div class="line"> </div>
 189 <div class="line">  delayTime = 1000U;                    <span class="comment">// delay 1 second</span></div>
 190 <div class="line">  status = <a class="code hl_function" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(delayTime);          <span class="comment">// suspend thread execution</span></div>
 191 <div class="line">}</div>
 192 <div class="ttc" id="acmsis__os2_8h_html"><div class="ttname"><a href="cmsis__os2_8h.html">cmsis_os2.h</a></div></div>
 193 <div class="ttc" id="agroup__CMSIS__RTOS__Definitions_html_ga6c0dbe6069e4e7f47bb4cd32ae2b813e"><div class="ttname"><a href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a></div><div class="ttdeci">osStatus_t</div><div class="ttdoc">Status code values returned by CMSIS-RTOS functions.</div><div class="ttdef"><b>Definition:</b> cmsis_os2.h:246</div></div>
 194 <div class="ttc" id="agroup__CMSIS__RTOS__Wait_html_gaf6055a51390ef65b6b6edc28bf47322e"><div class="ttname"><a href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a></div><div class="ttdeci">osStatus_t osDelay(uint32_t ticks)</div><div class="ttdoc">Wait for Timeout (Time Delay).</div></div>
 195 </div><!-- fragment -->
 196 </div>
 197 </div>
 198 <a id="ga3c807924c2d6d43bc2ffb49da3f7f3a1" name="ga3c807924c2d6d43bc2ffb49da3f7f3a1"></a>
 199 <h2 class="memtitle"><span class="permalink"><a href="#ga3c807924c2d6d43bc2ffb49da3f7f3a1">&#9670;&#160;</a></span>osDelayUntil()</h2>
 200
 201 <div class="memitem">
 202 <div class="memproto">
 203       <table class="memname">
 204         <tr>
 205           <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osDelayUntil </td>
 206           <td>(</td>
 207           <td class="paramtype">uint32_t&#160;</td>
 208           <td class="paramname"><em>ticks</em></td><td>)</td>
 209           <td></td>
 210         </tr>
 211       </table>
 212 </div><div class="memdoc">
 213 <dl class="params"><dt>Parameters</dt><dd>
 214   <table class="params">
 215     <tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td>absolute time in ticks </td></tr>
 216   </table>
 217   </dd>
 218 </dl>
 219 <dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
 220 <p>The function <b>osDelayUntil</b> waits until an absolute time (specified in kernel <em>ticks</em>) is reached.</p>
 221 <p>The corner case when the kernel tick counter overflows is handled by <b>osDelayUntil</b>. Thus it is absolutely legal to provide a value which is lower than the current tick value, i.e. returned by <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b">osKernelGetTickCount</a>. Typically as a user you do not have to take care about the overflow. The only limitation you have to have in mind is that the maximum delay is limited to (2<sup>31</sup>)-1 ticks.</p>
 222 <p>The delayed thread is put into the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">BLOCKED</a> state and a context switch occurs immediately. The thread is automatically put back to the <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state when the given time is reached. If the thread will have the highest priority in <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> state it will be scheduled immediately.</p>
 223 <p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p><ul>
 224 <li><em>osOK:</em> the time delay is executed.</li>
 225 <li><em>osErrorParameter:</em> the time cannot be handled (out of bounds).</li>
 226 <li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a> cannot be called from Interrupt Service Routines.</li>
 227 <li><em>osError:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a> cannot be executed (kernel not running or no <a class="el" href="group__CMSIS__RTOS__ThreadMgmt.html#ThreadStates">READY</a> thread exists).</li>
 228 </ul>
 229 <dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from Interrupt Service Routines.</dd></dl>
 230 <p><b>Code Example</b> </p><div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
 231 <div class="line"> </div>
 232 <div class="line"><span class="keywordtype">void</span> Thread_1 (<span class="keywordtype">void</span> *arg) {             <span class="comment">// Thread function</span></div>
 233 <div class="line">  uint32_t tick;</div>
 234 <div class="line"> </div>
 235 <div class="line">  tick = <a class="code hl_function" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b">osKernelGetTickCount</a>();        <span class="comment">// retrieve the number of system ticks</span></div>
 236 <div class="line">  <span class="keywordflow">for</span> (;;) {</div>
 237 <div class="line">    tick += 1000U;                      <span class="comment">// delay 1000 ticks periodically</span></div>
 238 <div class="line">    <a class="code hl_function" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a>(tick);</div>
 239 <div class="line">    <span class="comment">// ...</span></div>
 240 <div class="line">  }</div>
 241 <div class="line">}</div>
 242 <div class="ttc" id="agroup__CMSIS__RTOS__KernelCtrl_html_ga84bcdbf2fb76b10c8df4e439f0c7e11b"><div class="ttname"><a href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b">osKernelGetTickCount</a></div><div class="ttdeci">uint32_t osKernelGetTickCount(void)</div><div class="ttdoc">Get the RTOS kernel tick count.</div></div>
 243 <div class="ttc" id="agroup__CMSIS__RTOS__Wait_html_ga3c807924c2d6d43bc2ffb49da3f7f3a1"><div class="ttname"><a href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a></div><div class="ttdeci">osStatus_t osDelayUntil(uint32_t ticks)</div><div class="ttdoc">Wait until specified time.</div></div>
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