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<title>Using a CMSIS RTOS Implementation</title>
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<div id="projectname">CMSIS-RTOS
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 <span id="projectnumber">Version 1.00</span>
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</div>
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<div id="projectbrief">CMSIS-RTOS API: Generic RTOS interface for Cortex-M processor-based devices.</div>
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<li><a href="../../Core/html/index.html"><span>CORE</span></a></li>
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<li><a href="../../DSP/html/index.html"><span>DSP</span></a></li>
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<li class="current"><a href="../../RTOS/html/index.html"><span>RTOS API</span></a></li>
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<li><a href="../../SVD/html/index.html"><span>SVD</span></a></li>
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<div class="title">Using a CMSIS RTOS Implementation </div> </div>
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<div class="contents">
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<div class="textblock"><p>A CMSIS RTOS implementation is typically provided as a library. To add the RTOS functionality to an existing CMSIS-based application the RTOS library (and typically a configuration file) needs to be added. The available functionality of the RTOS library is defined in the file <b><a class="el" href="cmsis__os_8h.html">cmsis_os.h</a></b> that is specific for each RTOS implementation.</p>
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<div class="image">
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<img src="CMSIS_RTOS_Files.png" alt="CMSIS_RTOS_Files.png"/>
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<div class="caption">
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CMSIS-RTOS File Structure</div></div>
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<p> Depending on the CMSIS-RTOS implementation, execution may start with the <b>main</b> function as the first thread. This has the benefit that an application programmer may use other middleware libraries that create threads internally, but the remaining part of the user application just uses the <b>main</b> thread. Therefore, the usage of the RTOS can be invisible to the application programmer, but libraries can use CMSIS-RTOS features.</p>
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<p>Once the files are added to a project, the user can start using the CMSIS-RTOS functions. A code example is provided below:</p>
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<div class="fragment"><pre class="fragment"><span class="preprocessor">#include "<a class="code" href="cmsis__os_8h.html">cmsis_os.h</a>"</span> <span class="comment">// CMSIS RTOS header file</span>
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<span class="keywordtype">void</span> job1 (<span class="keywordtype">void</span> <span class="keyword">const</span> *argument) { <span class="comment">// thread function 'job1'</span>
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<span class="keywordflow">while</span> (1) {
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: <span class="comment">// execute some code</span>
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<a class="code" href="group___c_m_s_i_s___r_t_o_s___wait.html#ga02e19d5e723bfb06ba9324d625162255" title="Wait for Timeout (Time Delay)">osDelay</a> (10); <span class="comment">// delay execution for 10 milli seconds</span>
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}
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}
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<span class="comment">// define job1 as thread function</span>
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<a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaee93d929beb350f16e5cc7fa602e229f" title="Create a Thread Definition with function, priority, and stack requirements.">osThreadDef</a>(job1, <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#ga7f2b42f1983b9107775ec2a1c69a849aa17b36cd9cd38652c2bc6d4803990674b" title="priority: above normal">osPriorityAboveNormal</a>, 1, 0); <span class="comment">// define job1 as thread function</span>
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<span class="keywordtype">void</span> job2 (<span class="keywordtype">void</span> <span class="keyword">const</span> *argument) { <span class="comment">// thread function 'job2'</span>
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<a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#ga9e8ce62ab5f8c169d025af8c52e715db" title="Create a thread and add it to Active Threads and set it to state READY.">osThreadCreate</a>(<a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaf0c7c6b5e09f8be198312144b5c9e453" title="Access a Thread defintion.">osThread</a>(job1),NULL); <span class="comment">// create job1 thread</span>
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<span class="keywordflow">while</span> (1) {
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: <span class="comment">// execute some code</span>
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}
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}
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<a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaee93d929beb350f16e5cc7fa602e229f" title="Create a Thread Definition with function, priority, and stack requirements.">osThreadDef</a>(job2, <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#ga7f2b42f1983b9107775ec2a1c69a849aa45a2895ad30c79fb97de18cac7cc19f1" title="priority: normal (default)">osPriorityNormal</a>, 1, 0); <span class="comment">// define job2 as thread function</span>
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<span class="keywordtype">int</span> main (<span class="keywordtype">void</span>) { <span class="comment">// program execution starts here</span>
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: <span class="comment">// setup and initialize</span>
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<a class="code" href="group___c_m_s_i_s___r_t_o_s___kernel_ctrl.html#ga2865f10e5030a67d93424e32134881c8" title="Start the RTOS Kernel with executing the specified thread.">osKernelStart</a> (<a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaf0c7c6b5e09f8be198312144b5c9e453" title="Access a Thread defintion.">osThread</a>(job2), NULL); <span class="comment">// start kernel with job2 execution</span>
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<span class="keywordflow">while</span> (1); <span class="comment">// program will never reach this point</span>
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}
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</pre></div> </div></div>
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<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark"> </span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark"> </span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark"> </span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark"> </span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark"> </span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark"> </span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark"> </span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark"> </span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark"> </span>Defines</a></div>
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<li class="footer">Generated on Wed Mar 28 2012 15:38:10 for CMSIS-RTOS by ARM Ltd. All rights reserved.
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