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| <section id="customizing-nsh-initialization"> |
| <h1>Customizing NSH Initialization<a class="headerlink" href="#customizing-nsh-initialization" title="Permalink to this heading"></a></h1> |
| <p><strong>Ways to Customize NSH Initialization</strong>. There are three ways to |
| customize the NSH start-up behavior. Here they are presented in order of |
| increasing difficulty:</p> |
| <blockquote> |
| <div><ol class="arabic simple"> |
| <li><p>You can extend the initialization logic in |
| <code class="docutils literal notranslate"><span class="pre">boards/arm/stm32/stm3240g-eval/src/stm32_appinit.c</span></code>. The logic |
| there is called each time that NSH is started and is good place in |
| particular for any device-related initialization.</p></li> |
| <li><p>You replace the sample code at <code class="docutils literal notranslate"><span class="pre">apps/examples/nsh/nsh_main.c</span></code> with |
| whatever start-up logic that you want. NSH is a library at |
| <code class="docutils literal notranslate"><span class="pre">apps/nshlib</span></code>. <code class="docutils literal notranslate"><span class="pre">apps.examples/nsh</span></code> is just a tiny, example |
| start-up function (<code class="docutils literal notranslate"><span class="pre">CONFIG_INIT_ENTRYPOINT</span></code>()) that runs |
| immediately and illustrates how to start NSH If you want something |
| else to run immediately then you can write your write your own custom |
| <code class="docutils literal notranslate"><span class="pre">CONFIG_INIT_ENTRYPOINT</span></code>() function and then start other tasks |
| from your custom <code class="docutils literal notranslate"><span class="pre">CONFIG_INIT_ENTRYPOINT</span></code>().</p></li> |
| <li><p>NSH also supports a start-up script that executed when NSH first |
| runs. This mechanism has the advantage that the start-up script can |
| contain any NSH commands and so can do a lot of work with very little |
| coding. The disadvantage is that is is considerably more complex to |
| create the start-up script. It is sufficiently complex that is |
| deserves its own paragraph</p></li> |
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