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<div class="title">CMSIS DSP Software Library </div>  </div>
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<div class="textblock"><h1><a class="anchor" id="intro"></a>
Introduction</h1>
<p>This user manual describes the CMSIS DSP software library, a suite of common signal processing functions for use on Cortex-M and Cortex-A processor based devices.</p>
<p>The library is divided into a number of functions each covering a specific category:</p>
<ul>
<li>Basic math functions</li>
<li>Fast math functions</li>
<li>Complex math functions</li>
<li>Filtering functions</li>
<li>Matrix functions</li>
<li>Transform functions</li>
<li>Motor control functions</li>
<li>Statistical functions</li>
<li>Support functions</li>
<li>Interpolation functions</li>
<li>Support Vector Machine functions (SVM)</li>
<li>Bayes classifier functions</li>
<li>Distance functions</li>
<li>Quaternion functions</li>
</ul>
<p>The library has generally separate functions for operating on 8-bit integers, 16-bit integers, 32-bit integer and 32-bit floating-point values.</p>
<p>The library is providing vectorized versions of most algorthms for Helium and of most f32 algorithms for Neon.</p>
<p>When using a vectorized version, provide a little bit of padding after the end of a buffer (3 words) because the vectorized code may read a little bit after the end of a buffer. You don't have to modify your buffers but just ensure that the end of buffer + padding is not outside of a memory region.</p>
<h1><a class="anchor" id="using"></a>
Using the Library</h1>
<p>The library is released in source form. It is strongly advised to compile the library using -Ofast to have the best performances.</p>
<p>The library functions are declared in the public file <code><a class="el" href="arm__math_8h.html">arm_math.h</a></code> which is placed in the <code>Include</code> folder. Simply include this file. If you don't want to include everything, you can also rely on headers in Include/dsp folder and use only what you need.</p>
<h1><a class="anchor" id="example"></a>
Examples</h1>
<p>The library ships with a number of examples which demonstrate how to use the library functions.</p>
<h1><a class="anchor" id="toolchain"></a>
Toolchain Support</h1>
<p>The library is now tested on Fast Models building with cmake. Core M0, M4, M7, M33, M55, A32 are tested.</p>
<h1><a class="anchor" id="preprocessor"></a>
Preprocessor Macros</h1>
<p>Each library project have different preprocessor macros.</p>
<ul>
<li>ARM_MATH_BIG_ENDIAN:</li>
</ul>
<p>Define macro ARM_MATH_BIG_ENDIAN to build the library for big endian targets. By default library builds for little endian targets.</p>
<ul>
<li>ARM_MATH_MATRIX_CHECK:</li>
</ul>
<p>Define macro ARM_MATH_MATRIX_CHECK for checking on the input and output sizes of matrices</p>
<ul>
<li>ARM_MATH_ROUNDING:</li>
</ul>
<p>Define macro ARM_MATH_ROUNDING for rounding on support functions</p>
<ul>
<li>ARM_MATH_LOOPUNROLL:</li>
</ul>
<p>Define macro ARM_MATH_LOOPUNROLL to enable manual loop unrolling in DSP functions</p>
<ul>
<li>ARM_MATH_NEON:</li>
</ul>
<p>Define macro ARM_MATH_NEON to enable Neon versions of the DSP functions. It is not enabled by default when Neon is available because performances are dependent on the compiler and target architecture.</p>
<ul>
<li>ARM_MATH_NEON_EXPERIMENTAL:</li>
</ul>
<p>Define macro ARM_MATH_NEON_EXPERIMENTAL to enable experimental Neon versions of of some DSP functions. Experimental Neon versions currently do not have better performances than the scalar versions.</p>
<ul>
<li>ARM_MATH_HELIUM:</li>
</ul>
<p>It implies the flags ARM_MATH_MVEF and ARM_MATH_MVEI and ARM_MATH_MVE_FLOAT16.</p>
<ul>
<li>ARM_MATH_HELIUM_EXPERIMENTAL:</li>
</ul>
<p>Only taken into account when ARM_MATH_MVEF, ARM_MATH_MVEI or ARM_MATH_MVE_FLOAT16 are defined. Enable some vector versions which may have worse performance than scalar depending on the core / compiler configuration.</p>
<ul>
<li>ARM_MATH_MVEF:</li>
</ul>
<p>Select Helium versions of the f32 algorithms. It implies ARM_MATH_FLOAT16 and ARM_MATH_MVEI.</p>
<ul>
<li>ARM_MATH_MVEI:</li>
</ul>
<p>Select Helium versions of the int and fixed point algorithms.</p>
<ul>
<li>ARM_MATH_MVE_FLOAT16:</li>
</ul>
<p>MVE Float16 implementations of some algorithms (Requires MVE extension).</p>
<ul>
<li>DISABLEFLOAT16:</li>
</ul>
<p>Disable float16 algorithms when __fp16 is not supported for a specific compiler / core configuration. This is only valid for scalar. When vector architecture is supporting f16 then it can't be disabled.</p>
<ul>
<li>ARM_MATH_AUTOVECTORIZE:</li>
</ul>
<p>With Helium or Neon, disable the use of vectorized code with C intrinsics and use pure C instead. The vectorization is then done by the compiler.</p>
<hr/>
 <h1><a class="anchor" id="pack"></a>
CMSIS-DSP in ARM::CMSIS Pack</h1>
<p>The following files relevant to CMSIS-DSP are present in the <b>ARM::CMSIS</b> Pack directories: </p>
<table class="doxtable">
<tr>
<th>File/Folder </th><th>Content  </th></tr>
<tr>
<td><b>CMSIS\Documentation\DSP</b> </td><td>This documentation </td></tr>
<tr>
<td><b>CMSIS\DSP\Examples</b> </td><td>Example projects demonstrating the usage of the library functions </td></tr>
<tr>
<td><b>CMSIS\DSP\ComputeLibrary</b> </td><td>Small Neon kernels when building on Cortex-A </td></tr>
<tr>
<td><b>CMSIS\DSP\Include</b> </td><td>include files for using and building the lib </td></tr>
<tr>
<td><b>CMSIS\DSP\PrivateInclude</b> </td><td>private include files for building the lib </td></tr>
<tr>
<td><b>CMSIS\DSP\Source</b> </td><td>source files </td></tr>
</table>
<hr/>
 <h1><a class="anchor" id="rev"></a>
Revision History of CMSIS-DSP</h1>
<p>Please refer to <a class="el" href="ChangeLog_pg.html">Revision History</a>. </p>
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