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| <section id="custom-application-directories"> |
| <h1>Custom Application Directories<a class="headerlink" href="#custom-application-directories" title="Permalink to this heading"></a></h1> |
| <div class="admonition warning"> |
| <p class="admonition-title">Warning</p> |
| <p>Migrated from: |
| <a class="reference external" href="https://cwiki.apache.org/confluence/display/NUTTX/Custom+Application+Directories">https://cwiki.apache.org/confluence/display/NUTTX/Custom+Application+Directories</a></p> |
| </div> |
| <p>Most people use the generic <code class="docutils literal notranslate"><span class="pre">apps/</span></code> directory with NuttX. That is convenient |
| and well-documented. However, it should always be remembered that NuttX is a |
| stand-alone, general-purpose OS and has <strong>no dependency</strong> on that “canned” |
| application directory.</p> |
| <p>This page shows how to create your own, custom application directory from |
| scratch.</p> |
| <section id="creating-the-custom-application-directory"> |
| <h2>Creating the Custom Application Directory<a class="headerlink" href="#creating-the-custom-application-directory" title="Permalink to this heading"></a></h2> |
| <p>Below is a simple example of the <strong>minimum</strong> custom application directory. It |
| contains only three files: <code class="docutils literal notranslate"><span class="pre">Makefile</span></code>, <code class="docutils literal notranslate"><span class="pre">Kconfig</span></code>, and <code class="docutils literal notranslate"><span class="pre">hello.c</span></code>.</p> |
| <section id="makefile"> |
| <h3>Makefile<a class="headerlink" href="#makefile" title="Permalink to this heading"></a></h3> |
| <p>The custom application directory must include a <code class="docutils literal notranslate"><span class="pre">Makefile</span></code> that supports all |
| of the make targets expected by the NuttX build system <strong>and</strong> must generate an |
| archive called <code class="docutils literal notranslate"><span class="pre">libapps.a</span></code> in the top-level of the custom directory structure. |
| The minimal required targets for the <code class="docutils literal notranslate"><span class="pre">Makefile</span></code> look like this:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="nv">APPDIR</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="si">${</span><span class="nv">shell</span><span class="p"> pwd</span><span class="si">}</span> |
| |
| -include<span class="w"> </span><span class="k">$(</span>TOPDIR<span class="k">)</span>/Make.defs |
| |
| <span class="c1"># files</span> |
| |
| <span class="nv">CSRCS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>hello.c |
| <span class="nv">COBJS</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>hello.o |
| |
| <span class="nv">ROOTDEPPATH</span><span class="w"> </span><span class="o">=</span><span class="w"> </span>--dep-path<span class="w"> </span>. |
| |
| <span class="c1"># Build targets</span> |
| |
| all:<span class="w"> </span>libapps.a |
| .PHONY:<span class="w"> </span>dirlinks<span class="w"> </span>context<span class="w"> </span>preconfig<span class="w"> </span>depend<span class="w"> </span>clean<span class="w"> </span>clean_context<span class="w"> </span>distclean |
| .PRECIOUS:<span class="w"> </span>libapps<span class="k">$(</span>LIBEXT<span class="k">)</span> |
| |
| <span class="c1"># Compile C Files</span> |
| |
| <span class="k">$(</span>COBJS<span class="k">)</span>:<span class="w"> </span>%<span class="k">$(</span>OBJEXT<span class="k">)</span>:<span class="w"> </span>%.c |
| <span class="k">$(</span>call<span class="w"> </span>COMPILE,<span class="w"> </span>$<,<span class="w"> </span><span class="nv">$@</span><span class="k">)</span> |
| |
| <span class="c1"># Add object files to the apps archive</span> |
| |
| libapps.a:<span class="w"> </span><span class="k">$(</span>COBJS<span class="k">)</span> |
| <span class="k">$(</span>call<span class="w"> </span>ARCHIVE,<span class="w"> </span>libapps.a,<span class="w"> </span><span class="k">$(</span>COBJS<span class="k">))</span> |
| |
| <span class="c1"># Create directory links</span> |
| |
| dirlinks: |
| |
| <span class="c1"># Setup any special pre-build context</span> |
| |
| context: |
| |
| <span class="c1"># Setup any special pre-configuration context</span> |
| |
| preconfig: |
| |
| <span class="c1"># Make the dependency file, Make.deps</span> |
| |
| depend:<span class="w"> </span>Makefile<span class="w"> </span><span class="k">$(</span>CSRCS<span class="k">)</span> |
| <span class="k">$(</span>Q<span class="k">)</span><span class="w"> </span><span class="k">$(</span>MKDEP<span class="k">)</span><span class="w"> </span><span class="k">$(</span>ROOTDEPPATH<span class="k">)</span><span class="w"> </span><span class="s2">"</span><span class="k">$(</span>CC<span class="k">)</span><span class="s2">"</span><span class="w"> </span>--<span class="w"> </span><span class="k">$(</span>CFLAGS<span class="k">)</span><span class="w"> </span>--<span class="w"> </span><span class="k">$(</span>SRCS<span class="k">)</span><span class="w"> </span>>Make.dep |
| |
| <span class="c1"># Clean the results of the last build</span> |
| |
| clean: |
| <span class="k">$(</span>call<span class="w"> </span>CLEAN<span class="k">)</span> |
| |
| <span class="c1"># Remove the build context and directory links</span> |
| |
| clean_context: |
| |
| <span class="c1"># Restore the directory to its original state</span> |
| |
| distclean:<span class="w"> </span>clean<span class="w"> </span>clean_context |
| <span class="k">$(</span>call<span class="w"> </span>DELFILE,<span class="w"> </span>Make.dep<span class="k">)</span> |
| |
| <span class="c1"># Include dependencies</span> |
| |
| -include<span class="w"> </span>Make.dep |
| </pre></div> |
| </div> |
| </section> |
| <section id="kconfig"> |
| <h3>Kconfig<a class="headerlink" href="#kconfig" title="Permalink to this heading"></a></h3> |
| <p>A <code class="docutils literal notranslate"><span class="pre">Kconfig</span></code> file must be included, but it need not contain any meaningful |
| configuration options. This file is where you can add application-specific |
| configuration settings if desired. The minimal <code class="docutils literal notranslate"><span class="pre">Kconfig</span></code> might look like:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="c1"># For a description of the syntax of this configuration file,</span> |
| <span class="c1"># see the file kconfig-language.txt in the NuttX tools repository.</span> |
| <span class="c1">#</span> |
| </pre></div> |
| </div> |
| </section> |
| <section id="hello-c"> |
| <h3>hello.c<a class="headerlink" href="#hello-c" title="Permalink to this heading"></a></h3> |
| <p>Your custom application must compile at least one source file to generate the |
| required <code class="docutils literal notranslate"><span class="pre">libapps.a</span></code> archive. One of these source files must include the |
| <code class="docutils literal notranslate"><span class="pre">main()</span></code> entry point to the application. That main function (or similarly |
| named entry point) is called after OS initialization completes.</p> |
| <p>What this application initialization entry point does, how it interacts with |
| the rest of your application, and where the rest of you application code is |
| located is of no concern to the OS. Only this one entry point is needed.</p> |
| <p>Below is a small “Hello, World!” example, where <code class="docutils literal notranslate"><span class="pre">custom_main()</span></code> is the |
| application entry point:</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf"><stdio.h></span> |
| |
| <span class="kt">int</span><span class="w"> </span><span class="nf">custom_main</span><span class="p">(</span><span class="kt">int</span><span class="w"> </span><span class="n">argc</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">argv</span><span class="p">[])</span> |
| <span class="p">{</span> |
| <span class="n">printf</span><span class="p">(</span><span class="s">"Hello, World!!</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span> |
| <span class="k">return</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </section> |
| </section> |
| <section id="building-with-the-custom-application-directory"> |
| <h2>Building with the Custom Application Directory<a class="headerlink" href="#building-with-the-custom-application-directory" title="Permalink to this heading"></a></h2> |
| <p>In order to build with the new custom application directory, you need the |
| following in your NuttX configuration:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span><span class="nv">CONFIG_APPS_DIR</span><span class="o">=</span><span class="s2">"../custom-apps"</span> |
| <span class="nv">CONFIG_USER_ENTRYPOINT</span><span class="o">=</span><span class="s2">"custom_main"</span> |
| </pre></div> |
| </div> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>You can only access the <code class="docutils literal notranslate"><span class="pre">../custom-apps/Kconfig</span></code> file if |
| <code class="docutils literal notranslate"><span class="pre">CONFIG_APPS_DIR</span></code> is set to <code class="docutils literal notranslate"><span class="pre">../custom-apps</span></code> <strong>before</strong> running |
| <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">menuconfig</span></code>. If you start with an existing configuration, you may |
| face a “chicken-and-egg” situation. One workaround is to manually edit |
| the <code class="docutils literal notranslate"><span class="pre">.config</span></code> file before running <code class="docutils literal notranslate"><span class="pre">make</span> <span class="pre">menuconfig</span></code>.</p> |
| </div> |
| <p>Alternatively, if you use the <code class="docutils literal notranslate"><span class="pre">tools/configure.sh</span></code> script, you can specify the |
| custom-apps directory from the command line:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>tools/configure.sh<span class="w"> </span>-a<span class="w"> </span>../custom_apps<span class="w"> </span><board>:<config> |
| </pre></div> |
| </div> |
| <p>Afterward, just build NuttX as you normally would. When you run the program that |
| was built with your custom application directory, you should see:</p> |
| <div class="highlight-shell notranslate"><div class="highlight"><pre><span></span>Hello,<span class="w"> </span>World!! |
| </pre></div> |
| </div> |
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