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<div class="header">
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<a href="#func-members">Functions</a>  </div>
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<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>
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<p>Wait for a certain period of time.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<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>
<tr class="memdesc:gaf6055a51390ef65b6b6edc28bf47322e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wait for Timeout (Time Delay).  <a href="#gaf6055a51390ef65b6b6edc28bf47322e">More...</a><br/></td></tr>
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<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>
<tr class="memdesc:ga3c807924c2d6d43bc2ffb49da3f7f3a1"><td class="mdescLeft">&#160;</td><td class="mdescRight">Wait until specified time.  <a href="#ga3c807924c2d6d43bc2ffb49da3f7f3a1">More...</a><br/></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>The generic wait functions provide means for a time delay.</p>
<dl class="section note"><dt>Note</dt><dd>Generic wait functions cannot be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>. </dd></dl>
<h2 class="groupheader">Function Documentation</h2>
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          <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osDelay </td>
          <td>(</td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>ticks</em></td><td>)</td>
          <td></td>
        </tr>
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</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td><a class="el" href="theory_of_operation.html#CMSIS_RTOS_TimeOutValue">time ticks</a> value </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
<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>
<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 being scheduled immediately.</p>
<p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p>
<ul>
<li><em>osOK:</em> the time delay is executed.</li>
<li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a> cannot be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Code Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> Thread_1 (<span class="keywordtype">void</span> *arg) {             <span class="comment">// Thread function</span></div>
<div class="line">  osStatus_t status;                    <span class="comment">// capture the return status</span></div>
<div class="line">  uint32_t   delayTime;                 <span class="comment">// delay time in milliseconds</span></div>
<div class="line"> </div>
<div class="line">  delayTime = 1000U;                    <span class="comment">// delay 1 second</span></div>
<div class="line">  status = <a class="code" href="group__CMSIS__RTOS__Wait.html#gaf6055a51390ef65b6b6edc28bf47322e">osDelay</a>(delayTime);          <span class="comment">// suspend thread execution</span></div>
<div class="line">}</div>
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          <td class="memname"><a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> osDelayUntil </td>
          <td>(</td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>ticks</em></td><td>)</td>
          <td></td>
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      </table>
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<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">ticks</td><td>absolute time in ticks </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function.</dd></dl>
<p>The function <b>osDelayUntil</b> waits until an absolute time (specified in kernel <em>ticks</em>) is reached.</p>
<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>
<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 being scheduled immediately.</p>
<p>Possible <a class="el" href="group__CMSIS__RTOS__Definitions.html#ga6c0dbe6069e4e7f47bb4cd32ae2b813e">osStatus_t</a> return values:</p>
<ul>
<li><em>osOK:</em> the time delay is executed.</li>
<li><em>osParameter:</em> the time cannot be handled (out of bounds).</li>
<li><em>osErrorISR:</em> <a class="el" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a> cannot be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>This function <b>cannot</b> be called from <a class="el" href="theory_of_operation.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Code Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &quot;<a class="code" href="cmsis__os2_8h.html">cmsis_os2.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> Thread_1 (<span class="keywordtype">void</span> *arg) {             <span class="comment">// Thread function</span></div>
<div class="line">  uint32_t tick;</div>
<div class="line"> </div>
<div class="line">  tick = <a class="code" href="group__CMSIS__RTOS__KernelCtrl.html#ga84bcdbf2fb76b10c8df4e439f0c7e11b">osKernelGetTickCount</a>();        <span class="comment">// retrieve the number of system ticks</span></div>
<div class="line">  <span class="keywordflow">for</span> (;;) {</div>
<div class="line">    tick += 1000U;                      <span class="comment">// delay 1000 ticks periodically</span></div>
<div class="line">    <a class="code" href="group__CMSIS__RTOS__Wait.html#ga3c807924c2d6d43bc2ffb49da3f7f3a1">osDelayUntil</a>(tick);</div>
<div class="line">    <span class="comment">// ...</span></div>
<div class="line">  }</div>
<div class="line">}</div>
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