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<title>CMSIS-Core (Cortex-M): Using CMSIS with generic Arm Processors</title>
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<div id="projectname">CMSIS-Core (Cortex-M)
 <span id="projectnumber">Version 5.3.0</span>
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<div id="projectbrief">CMSIS-Core support for Cortex-M processor-based devices</div>
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<div class="title">Using CMSIS with generic Arm Processors </div> </div>
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<div class="textblock"><p>Arm provides CMSIS-Core (Cortex-M) files for the supported Arm Processors and for various compiler vendors. These files can be used when standard Arm processors should be used in a project. The table below lists the folder and device names of the Arm processors.</p>
<table class="cmtable">
<tr>
<th>Folder </th><th>Processor </th><th>Description </th></tr>
<tr>
<td>".\Device\ARM\ARMCM0" </td><td>Cortex-M0 </td><td>Contains <b>Include</b> and <b>Source</b> template files configured for the Cortex-M0 processor. The device name is ARMCM0 and the name of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is <ARMCM0.h>. </td></tr>
<tr>
<td>".\Device\ARM\ARMCM0plus" </td><td>Cortex-M0+ </td><td>Contains <b>Include</b> and <b>Source</b> template files configured for the Cortex-M0+ processor. The device name is ARMCM0plus and the name of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is <ARMCM0plus.h>. </td></tr>
<tr>
<td>".\Device\ARM\ARMCM3" </td><td>Cortex-M3 </td><td>Contains <b>Include</b> and <b>Source</b> template files configured for the Cortex-M3 processor. The device name is ARMCM3 and the name of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is <ARMCM3.h>. </td></tr>
<tr>
<td>".\Device\ARM\ARMCM4" </td><td>Cortex-M4 </td><td>Contains <b>Include</b> and <b>Source</b> template files configured for the Cortex-M4 processor. The device name is ARMCM4 and the name of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is <ARMCM4.h>. </td></tr>
<tr>
<td>".\Device\ARM\ARMCM7" </td><td>Cortex-M7 </td><td>Contains <b>Include</b> and <b>Source</b> template files configured for the Cortex-M7 processor. The device name is ARMCM7 and the name of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is <ARMCM7.h>. </td></tr>
<tr>
<td>".\Device\ARM\ARMSC000" </td><td>SecurCore SC000 </td><td>Contains <b>Include</b> and <b>Source</b> template files configured for the SecurCore SC000 processor. The device name is ARMSC000 and the name of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is <ARMSC000.h>. </td></tr>
<tr>
<td>".\Device\ARM\ARMSC300" </td><td>SecurCore SC300 </td><td>Contains <b>Include</b> and <b>Source</b> template files configured for the SecurCore SC300 processor. The device name is ARMSC300 and the name of the <a class="el" href="device_h_pg.html">Device Header File <device.h></a> is <ARMSC300.h>. </td></tr>
</table>
<dl class="section note"><dt>Note</dt><dd>CMSIS-Pack provides the <b>#define CMSIS_header_file</b> in <a href="../../Pack/html/pdsc_components_pg.html#RTE_Components_h"><b>RTE_Components.h</b></a> which gives you access to the <b><em>device</em>.h</b> file of a project. This allows you to generate generic software components that adjust to the device settings.</dd></dl>
<h1><a class="anchor" id="using_ARM_Lib_sec"></a>
Create generic Libraries with CMSIS</h1>
<p>The CMSIS Processor and Core Peripheral files allow also to create generic libraries. The <a href="../../DSP/html/index.html"><b>CMSIS-DSP</b> </a> Libraries are an example for such a generic library.</p>
<p>To build a generic Library set the define <b>__CMSIS_GENERIC</b> and include the relevant <b>core_<cpu>.h</b> CMSIS CPU & Core Access header file for the processor. The define <b>__CMSIS_GENERIC</b> disables device-dependent features such as the <b>SysTick</b> timer and the <b>Interrupt System</b>. Refer to <a class="el" href="device_h_pg.html#core_config_sect">Configuration of the Processor and Core Peripherals</a> for a list of the available <b>core_<cpu>.h</b> header files.</p>
<p><b>Example:</b> </p>
<p>The following code section shows the usage of the <b>core_<cpu>.h</b> header files to build a generic library for Cortex-M0, Cortex-M3, Cortex-M4, or Cortex-M7. To select the processor, the source code uses the define <b>CORTEX_M7</b>, <b>CORTEX_M4</b>, <b>CORTEX_M3</b>, <b>CORTEX_M0</b>, or <b>CORTEX_M0PLUS</b>. One of these defines needs to be provided on the compiler command line. By using this header file, the source code can access the functions for <a class="el" href="group__Core__Register__gr.html">Core Register Access</a>, <a class="el" href="group__intrinsic__CPU__gr.html">Intrinsic Functions for CPU Instructions</a>, <a class="el" href="group__intrinsic__SIMD__gr.html">Intrinsic Functions for SIMD Instructions [only Cortex-M4 and Cortex-M7]</a>, and <a class="el" href="group__ITM__Debug__gr.html">Debug Access</a>.</p>
<div class="fragment"><div class="line"><span class="preprocessor">#define __CMSIS_GENERIC </span><span class="comment">/* disable NVIC and Systick functions */</span><span class="preprocessor"></span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><span class="preprocessor">#if defined (CORTEX_M7)</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor"> #include "core_cm7.h"</span></div>
<div class="line"><span class="preprocessor">#elif defined (CORTEX_M4)</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor"> #include "core_cm4.h"</span></div>
<div class="line"><span class="preprocessor">#elif defined (CORTEX_M3)</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor"> #include "core_cm3.h"</span></div>
<div class="line"><span class="preprocessor">#elif defined (CORTEX_M0)</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor"> #include "core_cm0.h"</span></div>
<div class="line"><span class="preprocessor">#elif defined (CORTEX_M0PLUS)</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor"> #include "core_cm0plus.h"</span></div>
<div class="line"><span class="preprocessor">#else</span></div>
<div class="line"><span class="preprocessor"></span><span class="preprocessor"> #error "Processor not specified or unsupported."</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
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