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+<title>CMSIS-RTOS2: Main Page</title>
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+ <td id="projectlogo"><img alt="Logo" src="CMSIS_Logo_Final.png"/></td>
+ <td style="padding-left: 0.5em;">
+ <div id="projectname">CMSIS-RTOS2
+ &#160;<span id="projectnumber">Version 2.1.3</span>
+ </div>
+ <div id="projectbrief">Real-Time Operating System: API and RTX Reference Implementation</div>
+ </td>
+ </tr>
+ </tbody>
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+ <li class="current"><a href="index.html"><span>Main&#160;Page</span></a></li>
+ <li><a href="pages.html"><span>Usage&#160;and&#160;Description</span></a></li>
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+<div class="title">CMSIS-RTOS2 Documentation</div> </div>
+</div><!--header-->
+<div class="contents">
+<div class="textblock"><p>The <b>CMSIS-RTOS v2 (CMSIS-RTOS2)</b> provides generic RTOS interfaces for Arm&reg; Cortex&reg; processor-based devices. It provides a standardized API for software components that require RTOS functionality and gives therefore serious benefits to the users and the software industry:</p>
+<ul>
+<li>CMSIS-RTOS2 provides basic features that are required in many applications.</li>
+<li>The unified feature set of the CMSIS-RTOS2 reduces learning efforts and simplifies sharing of software components.</li>
+<li>Middleware components that use the CMSIS-RTOS2 are RTOS agnostic and are easier to adapt.</li>
+<li>Standard project templates of the CMSIS-RTOS2 may be shipped with freely available CMSIS-RTOS2 implementations.</li>
+</ul>
+<dl class="section note"><dt>Note</dt><dd>The CMSIS-RTOS API Version 2 defines a minimum feature set. Implementations with extended features may be provided by the RTOS vendors.</dd></dl>
+<p>The CMSIS-RTOS2 manages the resources of the microcontroller system and implements the concept of parallel threads that run concurrently.</p>
+<p>Applications frequently require several concurrent activities. CMSIS-RTOS2 can manage multiple concurrent activities at the time when they are needed. Each activity gets a separate thread which executes a specific task and this simplifies the overall program structure. The CMSIS-RTOS2 system is scalable and additional threads can be added easily at a later time. Threads have a priority allowing faster execution of time-critical parts of a user application.</p>
+<p>The CMSIS-RTOS2 offers services needed in many real-time applications, for example, periodical activation of timer functions, memory management, and message exchange between threads with time limits.</p>
+<p>The CMSIS-RTOS2 addresses the following new requirements:</p>
+<ul>
+<li>Dynamic object creation no longer requires static memory, static memory buffers are now optional.</li>
+<li>Support for Armv8-M architecture that provides a secure and non-secure state of code execution.</li>
+<li>Provisions for message passing in multi-core systems.</li>
+<li>Full support of C++ run-time environments.</li>
+<li>C interface which is binary compatible across <a href="http://infocenter.arm.com/help/topic/com.arm.doc.subset.swdev.abi/index.html">ABI compatible compilers</a>.</li>
+</ul>
+<p>As a consequence of these requirements the CMSIS-RTOS2 has the following fundamental modifications:</p>
+<ul>
+<li>The functions osXxxxNew replace osXxxxCreate functions; osXxxxNew and osXxxxDelete create and destroy objects.</li>
+<li>The C function <code>main</code> is no longer started as a thread (this was an optional feature in CMSIS-RTOS v1).</li>
+<li>Functions that return osEvent have been replaced.</li>
+</ul>
+<p>CMSIS-RTOS2 provides an translation layer to <a href="../../RTOS/html/index.html" class="el">CMSIS-RTOS v1</a>. It is possible to intermix <a class="el" href="rtos_api2.html">CMSIS-RTOS C API v2</a> and <a href="../../RTOS/html/functionOverview.html" class="el">CMSIS-RTOS C API v1</a> within the same application. Over time, you may migrate to the new API as explained in <a class="el" href="os2Migration.html">Migration from API v1 to API v2</a>.</p>
+<p>CMSIS-RTOS2 is not POSIX compliant, but has provisions to enable a C++11/C++14 interface.</p>
+<p>The following sections provide further details about CMSIS-RTOS2 and the RTX reference implementation.</p>
+<ul>
+<li><a class="el" href="rtos_revisionHistory.html">Revision History</a> documents changes made in each version for CMSIS-RTOS v2 and RTX v5.</li>
+<li><a class="el" href="genRTOS2IF.html">Generic RTOS Interface</a> provides an overview about the APIs available with CMSIS-RTOS v2.</li>
+<li><a class="el" href="functionOverview.html">Function Overview</a> lists the CMSIS-RTOS2 API functions and the header file cmsis_os2.h.</li>
+<li><a class="el" href="rtosValidation.html">RTOS Validation</a> describes the validation suite that is publicly available.</li>
+<li><a class="el" href="os2Migration.html">Migration from API v1 to API v2</a> shows how to use CMSIS-RTOS2 in existing projects and lists function differences to CMSIS-RTOS v1.</li>
+<li><a class="el" href="rtx5_impl.html">RTX v5 Implementation</a> provides general information about the operation and usage of RTX v5.</li>
+</ul>
+<hr/>
+<h2>CMSIS-RTOS2 in ARM::CMSIS Pack </h2>
+<p><a class="anchor" id="directory"></a> The following files relevant to CMSIS-RTOS2 are present in the <b>ARM::CMSIS</b> Pack directories: </p>
+<table class="doxtable">
+<tr>
+<th align="left">Directory </th><th align="left">Content </th></tr>
+<tr>
+<td align="left"><b>CMSIS/Documentation/RTOS2</b> </td><td align="left">This documentation </td></tr>
+<tr>
+<td align="left"><b>CMSIS/RTOS2/Include</b> </td><td align="left"><a class="el" href="genRTOS2IF.html#cmsis_os2_h">cmsis_os2.h header file</a> </td></tr>
+<tr>
+<td align="left"><b>CMSIS/RTOS2/RTX</b> </td><td align="left">CMSIS-RTOS2 reference implementation based on RTX version 5 </td></tr>
+<tr>
+<td align="left"><b>CMSIS/RTOS2/Source</b> </td><td align="left">Generic <b>OS tick</b> implementations for various processors based on <a class="el" href="rtos_os_tick_api.html">OS Tick API</a> </td></tr>
+<tr>
+<td align="left"><b>CMSIS/RTOS2/Template</b> </td><td align="left">Compatibility layer to <a href="../../RTOS/html/index.html" class="el">CMSIS-RTOS v1</a> </td></tr>
+</table>
+</div></div><!-- contents -->
+</div><!-- doc-content -->
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+ <li class="footer">Generated on Wed Aug 1 2018 17:12:46 for CMSIS-RTOS2 by Arm Ltd. All rights reserved.
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