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   <div class="section" id="configuring">
 <span id="id1"></span><h1>Configuring<a class="headerlink" href="#configuring" title="Permalink to this headline">¶</a></h1>
 <p>Apache NuttX is a very configurable operating system. Nearly all features can be configured in or
 out of the system. This makes it possible to compile a build tailored for your hardware and
 application. It also makes configuring the system complex at times.</p>
 <p>There is a configuration system that can be used on the commandline or in a GUI. I’ve found
 the easiest way to configured Apache NuttX is to use the <code class="docutils literal notranslate"><span class="pre">menuconfig</span></code> system. This is used
 via a terminal program and allows quick access to all of Apache NuttX’s features via a system of
 menus.</p>
 <p>The Apache NuttX configuration system uses Linux’s
 <a class="reference external" href="https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt">kconfig system</a> adapted for use with Apache
 NuttX. Here’s info on Linux’s kconfig <a class="reference external" href="https://en.wikipedia.org/wiki/Menuconfig">menuconfig</a> system.</p>
 <p>After you’ve configured your board (see <a class="reference internal" href="compiling.html#compiling"><span class="std std-ref">Compiling</span></a>), you can use the menuconfig system
 to change the configuration. Once you’ve configured, you can compile to make a build that
 has your configuration options selected.</p>
 <ol class="arabic">
 <li><p>Initialize Board Configuration</p>
 <p>Here we’ll use the simulator since that’s the simplest to explain. You can do this with
 any board and base configuration.  Note here you should be supplying <cite>configure.sh</cite> the correct flag
 for your build environment:</p>
 <blockquote>
 <div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>-l selects the Linux <span class="o">(</span>l<span class="o">)</span> host environment.
 -m selects the macOS <span class="o">(</span>m<span class="o">)</span> host environment.
 -c selects the Windows host and Cygwin <span class="o">(</span>c<span class="o">)</span> environment.
 -g selects the Windows host and MinGW/MSYS environment.
 -n selects the Windows host and Windows native <span class="o">(</span>n<span class="o">)</span> environment.
 </pre></div>
 </div>
 </div></blockquote>
 <p>Select the simulator configuration for a Linux host:</p>
 <blockquote>
 <div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> nuttx
 $ make distclean  <span class="c1"># make a clean start, clearing out old configurations</span>
 $ ./tools/configure.sh -l sim:nsh
   Copy files
   Select <span class="nv">CONFIG_HOST_LINUX</span><span class="o">=</span>y
   Refreshing...
 </pre></div>
 </div>
 </div></blockquote>
 </li>
 <li><p>Make</p>
 <blockquote>
 <div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make clean<span class="p">;</span> make
 $ ./nuttx
 login:
 </pre></div>
 </div>
 </div></blockquote>
 <p>From another terminal window, kill the simulator:</p>
 <blockquote>
 <div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ pkill nuttx
 </pre></div>
 </div>
 </div></blockquote>
 </li>
 <li><p>Menu Configuration</p>
 <p>Showing that <code class="docutils literal notranslate"><span class="pre">login:</span></code> is annyoing. Let’s use the <code class="docutils literal notranslate"><span class="pre">menuconfig</span></code> system to turn it off.</p>
 <blockquote>
 <div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make menuconfig
 </pre></div>
 </div>
 </div></blockquote>
 <p>Here’s what you should see:</p>
 <a class="reference internal image-reference" href="../_images/menuconfig.png"><img alt="Screenshot of menuconfig system main screen" class="align-center" src="../_images/menuconfig.png" style="width: 800px;" /></a>
 <p><br/></p>
 </li>
 <li><p>Application Configuration</p>
 <p>The NSH Login setting is under <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span> <span class="pre">&gt;</span> <span class="pre">NSH</span> <span class="pre">Library</span></code>. Use
 the up and down arrows to navigate to <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span></code>; hit <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> to
 select it. Now you’re in the <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span></code> menu. Use the arrows to go
 down to <code class="docutils literal notranslate"><span class="pre">NSH</span> <span class="pre">Library</span></code> and select that. Now navigate down to <code class="docutils literal notranslate"><span class="pre">Console</span> <span class="pre">Login</span></code> and use
 the spacebar to uncheck that setting (so that it has a blank space instead of a star in it).</p>
 <p>Now let’s save. Use the right and left arrow keys to select the <code class="docutils literal notranslate"><span class="pre">Exit</span></code> menu item at the
 bottom of the screen. Hit <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> to select it, hit <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> again, and again, finally
 hitting <code class="docutils literal notranslate"><span class="pre">&lt;return&gt;</span></code> in the <code class="docutils literal notranslate"><span class="pre">Save</span> <span class="pre">Configuration</span></code> dialog box.</p>
 </li>
 <li><p>Make the New Configuration</p>
 <blockquote>
 <div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make clean<span class="p">;</span> make
 </pre></div>
 </div>
 </div></blockquote>
 </li>
 <li><p>Run</p>
 <blockquote>
 <div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ./nuttx
 NuttShell <span class="o">(</span>NSH<span class="o">)</span> NuttX-8.2
 MOTD: <span class="nv">username</span><span class="o">=</span>admin <span class="nv">password</span><span class="o">=</span>Administrator
 </pre></div>
 </div>
 </div></blockquote>
 <p>Success!</p>
 <p>If you find that message of the day (MOTD) annoying and want to turn that off, it’s
 configured in <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span> <span class="pre">&gt;</span> <span class="pre">NSH</span> <span class="pre">Library</span> <span class="pre">&gt;&gt;</span> <span class="pre">Message</span> <span class="pre">of</span> <span class="pre">the</span> <span class="pre">Day</span> <span class="pre">(MOTD)</span></code>.</p>
 </li>
 </ol>
 <hr class="docutils" />
 <p>Next up is <a class="reference internal" href="debugging.html#debugging"><span class="std std-ref">Debugging</span></a>.</p>
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	<div class="section" id="configuring">
	<span id="id1"></span><h1>Configuring<a class="headerlink" href="#configuring" title="Permalink to this headline">¶</a></h1>
	<p>Apache NuttX is a very configurable operating system. Nearly all features can be configured in or
	out of the system. This makes it possible to compile a build tailored for your hardware and
	application. It also makes configuring the system complex at times.</p>
	<p>There is a configuration system that can be used on the commandline or in a GUI. I’ve found
	the easiest way to configured Apache NuttX is to use the <code class="docutils literal notranslate"><span class="pre">menuconfig</span></code> system. This is used
	via a terminal program and allows quick access to all of Apache NuttX’s features via a system of
	menus.</p>
	<p>The Apache NuttX configuration system uses Linux’s
	<a class="reference external" href="https://www.kernel.org/doc/Documentation/kbuild/kconfig-language.txt">kconfig system</a> adapted for use with Apache
	NuttX. Here’s info on Linux’s kconfig <a class="reference external" href="https://en.wikipedia.org/wiki/Menuconfig">menuconfig</a> system.</p>
	<p>After you’ve configured your board (see <a class="reference internal" href="compiling.html#compiling"><span class="std std-ref">Compiling</span></a>), you can use the menuconfig system
	to change the configuration. Once you’ve configured, you can compile to make a build that
	has your configuration options selected.</p>
	<ol class="arabic">
	<li><p>Initialize Board Configuration</p>
	<p>Here we’ll use the simulator since that’s the simplest to explain. You can do this with
	any board and base configuration. Note here you should be supplying <cite>configure.sh</cite> the correct flag
	for your build environment:</p>
	<blockquote>
	<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>-l selects the Linux <span class="o">(</span>l<span class="o">)</span> host environment.
	-m selects the macOS <span class="o">(</span>m<span class="o">)</span> host environment.
	-c selects the Windows host and Cygwin <span class="o">(</span>c<span class="o">)</span> environment.
	-g selects the Windows host and MinGW/MSYS environment.
	-n selects the Windows host and Windows native <span class="o">(</span>n<span class="o">)</span> environment.
	</pre></div>
	</div>
	</div></blockquote>
	<p>Select the simulator configuration for a Linux host:</p>
	<blockquote>
	<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ <span class="nb">cd</span> nuttx
	$ make distclean <span class="c1"># make a clean start, clearing out old configurations</span>
	$ ./tools/configure.sh -l sim:nsh
	Copy files
	Select <span class="nv">CONFIG_HOST_LINUX</span><span class="o">=</span>y
	Refreshing...
	</pre></div>
	</div>
	</div></blockquote>
	</li>
	<li><p>Make</p>
	<blockquote>
	<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make clean<span class="p">;</span> make
	$ ./nuttx
	login:
	</pre></div>
	</div>
	</div></blockquote>
	<p>From another terminal window, kill the simulator:</p>
	<blockquote>
	<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ pkill nuttx
	</pre></div>
	</div>
	</div></blockquote>
	</li>
	<li><p>Menu Configuration</p>
	<p>Showing that <code class="docutils literal notranslate"><span class="pre">login:</span></code> is annyoing. Let’s use the <code class="docutils literal notranslate"><span class="pre">menuconfig</span></code> system to turn it off.</p>
	<blockquote>
	<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make menuconfig
	</pre></div>
	</div>
	</div></blockquote>
	<p>Here’s what you should see:</p>
	<a class="reference internal image-reference" href="../_images/menuconfig.png"><img alt="Screenshot of menuconfig system main screen" class="align-center" src="../_images/menuconfig.png" style="width: 800px;" /></a>
	<p><br/></p>
	</li>
	<li><p>Application Configuration</p>
	<p>The NSH Login setting is under <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span> <span class="pre">></span> <span class="pre">NSH</span> <span class="pre">Library</span></code>. Use
	the up and down arrows to navigate to <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span></code>; hit <code class="docutils literal notranslate"><span class="pre"><return></span></code> to
	select it. Now you’re in the <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span></code> menu. Use the arrows to go
	down to <code class="docutils literal notranslate"><span class="pre">NSH</span> <span class="pre">Library</span></code> and select that. Now navigate down to <code class="docutils literal notranslate"><span class="pre">Console</span> <span class="pre">Login</span></code> and use
	the spacebar to uncheck that setting (so that it has a blank space instead of a star in it).</p>
	<p>Now let’s save. Use the right and left arrow keys to select the <code class="docutils literal notranslate"><span class="pre">Exit</span></code> menu item at the
	bottom of the screen. Hit <code class="docutils literal notranslate"><span class="pre"><return></span></code> to select it, hit <code class="docutils literal notranslate"><span class="pre"><return></span></code> again, and again, finally
	hitting <code class="docutils literal notranslate"><span class="pre"><return></span></code> in the <code class="docutils literal notranslate"><span class="pre">Save</span> <span class="pre">Configuration</span></code> dialog box.</p>
	</li>
	<li><p>Make the New Configuration</p>
	<blockquote>
	<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ make clean<span class="p">;</span> make
	</pre></div>
	</div>
	</div></blockquote>
	</li>
	<li><p>Run</p>
	<blockquote>
	<div><div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>$ ./nuttx
	NuttShell <span class="o">(</span>NSH<span class="o">)</span> NuttX-8.2
	MOTD: <span class="nv">username</span><span class="o">=</span>admin <span class="nv">password</span><span class="o">=</span>Administrator
	</pre></div>
	</div>
	</div></blockquote>
	<p>Success!</p>
	<p>If you find that message of the day (MOTD) annoying and want to turn that off, it’s
	configured in <code class="docutils literal notranslate"><span class="pre">Application</span> <span class="pre">Configuration</span> <span class="pre">></span> <span class="pre">NSH</span> <span class="pre">Library</span> <span class="pre">>></span> <span class="pre">Message</span> <span class="pre">of</span> <span class="pre">the</span> <span class="pre">Day</span> <span class="pre">(MOTD)</span></code>.</p>
	</li>
	</ol>
	<hr class="docutils" />
	<p>Next up is <a class="reference internal" href="debugging.html#debugging"><span class="std std-ref">Debugging</span></a>.</p>
	</div>


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