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<div class="PageDoc"><div class="header">
  <div class="headertitle">
<div class="title">Creating an application </div>  </div>
</div><!--header-->
<div class="contents">
<div class="toc"><h3>Table of Contents</h3>
<ul><li class="level1"><a href="#creating-an-application-full-fledge">Creating an application for full-fledged devices</a></li>
<li class="level1"><a href="#creating-an-application-res-lim">Creating an application for resource-limited devices</a></li>
<li class="level1"><a href="#the-main-function">The main function</a></li>
<li class="level1"><a href="#the-applications-makefile">The application&#39;s Makefile</a><ul><li class="level2"><a href="#the-minimal-makefile">The minimal Makefile</a></li>
<li class="level2"><a href="#including-modules">Including modules</a></li>
</ul>
</li>
</ul>
</div>
<div class="textblock"><dl class="section author"><dt>Author</dt><dd>Zakaria Kasmi</dd></dl>
<p>An application can be created for full-fledged or resource-limited devices.</p>
<h1><a class="anchor" id="creating-an-application-full-fledge"></a>
Creating an application for full-fledged devices</h1>
<p>We recommend to use the <a href="https://www.eclipse.org/">Eclipse IDE</a> for C/C++ Developers for creating own application. The simplest way to write your own application, is to put your *.c and *.h files under the <code>src</code> directory. Another way is to create a directory containing the multiple C file(s) with your source code. The header files can be imported in the Eclipse IDE by opening Project-&gt;Properties and selecting ''C/C++ General-&gt;Paths and Symbols-&gt;Languages-&gt;GNU C'' from the Selection Wizard. Click the ''Add..'' button to browse to the header-directory and the select the ''Apply'' and ''OK'' buttons. The users can be oriented to the main.c and the examples in the <a href="https://git.imp.fu-berlin.de/zkasmi/RcdMathLib/-/tree/master/">main-directory</a> of the RcdMathLib.</p>
<h1><a class="anchor" id="creating-an-application-res-lim"></a>
Creating an application for resource-limited devices</h1>
<p>To create your own application for a resource-limited device you need to create a directory containing one or multiple C file(s) with your source code and a Makefile. An example Makefile is available in the <code>src</code> folder of the <a href="https://git.imp.fu-berlin.de/zkasmi/RcdMathLib/-/blob/master/eclipse_projects/RcdMathLib_resource_limited_devices.zip">Eclipse project for resource-limited devices</a>.</p>
<h1><a class="anchor" id="the-main-function"></a>
The main function</h1>
<p>RIOT starts two threads the idle and main threads after the board is initialized. The idle thread has the lowest priority while the main thread has a priority that is in the middle between the lowest and the highest available priorities. The main thread is the first that runs and calls the <code>main()</code> function. This function needs to be defined in the source code of each application (typically located in the <code>main.c</code> file).</p>
<div class="fragment"><div class="line"><span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="matrix__test_8h.html">matrix_test.h</a>&quot;</span></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="vector__test_8h.html">vector_test.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line">    puts(<span class="stringliteral">&quot;RcdMathLib Application!&quot;</span>);</div>
<div class="line">    <span class="comment">// Test the basic operations module;</span></div>
<div class="line">    <a class="code" href="matrix__test_8h.html#aad3d0f4acb79e8a9b61eda59dc3a12b2">matrix_test</a>();</div>
<div class="line">    <a class="code" href="vector__test_8h.html#ab0aed13072bc11b97766634c625d6f21">vector_test</a>();</div>
<div class="line">    </div>
<div class="line">    <span class="keywordflow">return</span> EXIT_SUCCESS;</div>
<div class="line">}</div>
</div><!-- fragment --><p>The above C code shows an application testing the basic operations sub-modules. This application run operations of the vector and matrix sub-modules.</p>
<h1><a class="anchor" id="the-applications-makefile"></a>
The application's Makefile</h1>
<h2><a class="anchor" id="the-minimal-makefile"></a>
The minimal Makefile</h2>
<p>At minimum the Makefile of an application (see <a class="el" href="getting-started.html">Getting started</a>) needs to define the following macros:</p><ul>
<li><code>APPLICATION</code>: contains the name of your application</li>
<li><code>RIOTBASE</code>: specifies the path to your copy of the RIOT repository (note, the <code></code> macro can be used to give a relative path)</li>
<li><code>RCDMATHLIB</code>: specifies the path to the copy of the RcdMathLib repository (note, the <code></code> macro can be used to give a relative path)</li>
<li><code>USEMODULE</code>: specifies the module of the RcdMathLib that you may want to use</li>
</ul>
<p>The <code>BOARD</code> macro is also required and recommended to be set to <code>native</code> by default, but is recommended to be overridable with the <code>?=</code> operator. Additionally, it is required to include the <code>Makefile.include</code> from the RcdMathLib and from the <code>RIOTBASE</code>.</p>
<div class="fragment"><div class="line"># Set the name of your application:</div>
    <div class="line">APPLICATION = foobar</div>
<div class="line"> </div>
<div class="line"># If no BOARD is found in the environment, use this default:</div>
<div class="line">BOARD ?= native</div>
<div class="line"> </div>
<div class="line"># This has to be the absolute path to the RcdMathLib base directory:</div>
<div class="line">RCDMATHLIB ?= $(CURDIR)/../RcdMathLib</div>
<div class="line"> </div>
<div class="line"># This has to be the absolute path to the RIOT base directory:</div>
<div class="line">RIOTBASE ?= $(CURDIR)/../../RIOT</div>
<div class="line"> </div>
<div class="line"> </div>
<div class="line">include $(RCDMATHLIB)/Makefile.include</div>
<div class="line">include $(RIOTBASE)/Makefile.include</div>
</div><!-- fragment --><h2><a class="anchor" id="including-modules"></a>
Including modules</h2>
<p>The modules of the RcdMathLib as well as of the RcdMathLib can be included. In order to use additional modules, such as a particular driver or a system library, the modules' names must be appended to the USEMODULE variable. For example, to build an application using the SHT11 temperature sensor and UDP/IPv6 functionalities, the Makefile needs to contain the following lines:</p>
<div class="fragment"><div class="line">USEMODULE += sht11</div>
<div class="line">USEMODULE += gnrc_ipv6_default</div>
<div class="line">USEMODULE += gnrc_udp</div>
</div><!-- fragment --><p>For example, to create an application using the matrix decompositions, the pseudo-inverse, and solving linear equations sub-modules, the Makefile must comprise the following lines:</p>
<div class="fragment"><div class="line">USEMODULE += matrix_decompositions</div>
<div class="line">USEMODULE += pseudo_inverse</div>
<div class="line">USEMODULE += utilities</div>
</div><!-- fragment --> </div></div><!-- contents -->
</div><!-- PageDoc -->
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<div class="ttc" id="avector__test_8h_html_ab0aed13072bc11b97766634c625d6f21"><div class="ttname"><a href="vector__test_8h.html#ab0aed13072bc11b97766634c625d6f21">vector_test</a></div><div class="ttdeci">void vector_test(void)</div><div class="ttdoc">Examples of vector operations.</div><div class="ttdef"><b>Definition:</b> <a href="vector__test_8c_source.html#l00030">vector_test.c:30</a></div></div>
<div class="ttc" id="amatrix__test_8h_html"><div class="ttname"><a href="matrix__test_8h.html">matrix_test.h</a></div><div class="ttdoc">Examples of matrix computations.</div></div>
<div class="ttc" id="avector__test_8h_html"><div class="ttname"><a href="vector__test_8h.html">vector_test.h</a></div><div class="ttdoc">Examples of vector computations.</div></div>
<div class="ttc" id="amatrix__test_8h_html_aad3d0f4acb79e8a9b61eda59dc3a12b2"><div class="ttname"><a href="matrix__test_8h.html#aad3d0f4acb79e8a9b61eda59dc3a12b2">matrix_test</a></div><div class="ttdeci">void matrix_test(void)</div><div class="ttdoc">Test some matrix operations.</div><div class="ttdef"><b>Definition:</b> <a href="matrix__test_8c_source.html#l00031">matrix_test.c:31</a></div></div>
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