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42   <td id="projectlogo" style="padding: 1.5em;"><a href="https://www.keil.arm.com/cmsis" target="_blank"><img alt="Logo" src="cmsis_logo_white_small.png"/</a></td>
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44    <div id="projectname">CMSIS-FreeRTOS
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52    </div>
53    <div id="projectbrief">CMSIS-RTOS2 compliant FreeRTOS Implementation</div>
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129   <div class="headertitle"><div class="title">Introduction </div></div>
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131 <div class="contents">
132 <div class="textblock"><p><a class="anchor" id="mainpage"></a></p>
133 <p><a href="https://www.freertos.org/">FreeRTOS</a> is one of the market-leading real-time operating systems (RTOS) for embedded microcontrollers. It is professionally developed, <a href="https://www.freertos.org/FreeRTOS-Coding-Standard-and-Style-Guide.html">strictly quality controlled</a>, robust, <a href="https://forums.freertos.org/">supported</a> <a href="https://www.freertos.org/FreeRTOS_Support_Forum_Archive/freertos_support_forum_archive_index.html/">(archive)</a>, free to <a href="https://www.freertos.org/a00114.html">use in commercial products</a> without a requirement to expose proprietary source code, and has <a href="https://www.freertos.org/differences-between-officially-supported-and-contributed-FreeRTOS-code.html">no IP infringement</a> risk.</p>
134 <p><a href="https://arm-software.github.io/CMSIS_6/latest/RTOS2/index.html"><b>CMSIS-RTOS v2</b></a> is a common API for real-time operating systems (RTOS). It provides a standardized programming interface that is portable to many RTOS and enables software components that can work across multiple RTOS systems. It supports the Armv8-M architecture, dynamic object creation, multi-core systems, and has a binary-compatible interface across ABI-compliant compilers.</p>
135 <p>Using this software pack, users can choose between a native FreeRTOS implementation or one that adheres to the CMSIS-RTOS2 API and uses FreeRTOS under the hood. The CMSIS-RTOS2 API enables programmers to create portable application code to be used with different RTOS kernels (for example <a href="https://developer.arm.com/Tools%20and%20Software/Keil%20MDK/RTX5%20RTOS/">Keil RTX5</a>).</p>
136 <p>This documentation shows you:</p>
137 <ul>
138 <li>how to <a class="el" href="page_create_project.html">create a new microcontroller project</a> using FreeRTOS from scratch.</li>
139 <li>various <a class="el" href="page_example_projects.html">examples</a> show you the usage of FreeRTOS in native and CMSIS-RTOS2 mode.</li>
140 <li>the <a class="el" href="page_technical_data.html">technical data</a> of this implementation.</li>
141 <li><a class="el" href="rev_hist.html">Revision history</a>.</li>
142 </ul>
143 <h1><a class="anchor" id="autotoc_md0"></a>
144 License</h1>
145 <p>The CMSIS-FreeRTOS implementation is provided free of charge by Arm under the <b>Apache 2.0 License</b>. <br  />
146  See the <a href="https://raw.githubusercontent.com/ARM-software/CMSIS-FreeRTOS/refs/heads/main/LICENSE">Apache 2.0 License</a>.</p>
147 <p>The FreeRTOS kernel source files are released under the <b>MIT License</b>. <br  />
148  See the <a href="https://github.com/ARM-software/CMSIS-FreeRTOS/blob/main/Source/LICENSE.md">MIT License</a>.</p>
149 <h1><a class="anchor" id="autotoc_md1"></a>
150 CMSIS-FreeRTOS Pack</h1>
151 <p>The <b>ARM::CMSIS-FreeRTOS</b> pack contains the following:</p>
152 <table class="markdownTable">
153 <tr class="markdownTableHead">
154 <th class="markdownTableHeadLeft">File/Directory   </th><th class="markdownTableHeadLeft">Content    </th></tr>
155 <tr class="markdownTableRowOdd">
156 <td class="markdownTableBodyLeft">📂 CMSIS/RTOS2   </td><td class="markdownTableBodyLeft">CMSIS-RTOS2 compliant implementation of FreeRTOS.    </td></tr>
157 <tr class="markdownTableRowEven">
158 <td class="markdownTableBodyLeft">📂 Documentation   </td><td class="markdownTableBodyLeft">This documentation.    </td></tr>
159 <tr class="markdownTableRowOdd">
160 <td class="markdownTableBodyLeft">📂 Source   </td><td class="markdownTableBodyLeft">FreeRTOS kernel source code.    </td></tr>
161 <tr class="markdownTableRowEven">
162 <td class="markdownTableBodyLeft">📄 ARM.CMSIS-FreeRTOS.pdsc   </td><td class="markdownTableBodyLeft">Pack description file in CMSIS-Pack format.    </td></tr>
163 <tr class="markdownTableRowOdd">
164 <td class="markdownTableBodyLeft">📄 LICENSE   </td><td class="markdownTableBodyLeft">License Agreement (Apache 2.0 + MIT).   </td></tr>
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