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| <div class="section" id="how-to-reduce-application-code-size"> |
| <h1>How to Reduce Application Code Size<a class="headerlink" href="#how-to-reduce-application-code-size" title="Permalink to this headline">ΒΆ</a></h1> |
| <p>Gettng your application to fit in an image slot can be challenging, |
| particularly on flash constrained hardware such as the nRF51. Below are |
| some suggested system configuration settings that reduce the code size |
| of your Mynewt image.</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 35%" /> |
| <col style="width: 65%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Setting</p></th> |
| <th class="head"><p>Description</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>LOG_LEVEL: 255</p></td> |
| <td><p>Disable all logging.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>LOG_CLI: 0</p></td> |
| <td><p>Disable log shell commands.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>STATS_CLI: 0</p></td> |
| <td><p>Disable stats shell commands.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>SHELL_TASK: 0</p></td> |
| <td><p>Disable the interactive shell.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>SHELL_OS_MODULE: 0</p></td> |
| <td><p>Disable memory management shell commands.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>SHELL_CMD_HELP: 0</p></td> |
| <td><p>Disable help for shell commands.</p></td> |
| </tr> |
| </tbody> |
| </table> |
| <p>You can use the <code class="docutils literal notranslate"><span class="pre">newt</span> <span class="pre">target</span> <span class="pre">set</span></code> command to set the syscfg settings |
| in the <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file for the target. See the <a class="reference internal" href="../../newt/command_list/newt_target.html"><span class="doc">Newt Tool Command |
| Guide</span></a> for the command syntax.</p> |
| <p><strong>Note:</strong> The <code class="docutils literal notranslate"><span class="pre">newt</span> <span class="pre">target</span> <span class="pre">set</span></code> command deletes all the current syscfg |
| settings in the target <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file and only sets the syscfg |
| settings specified in the command. If you are experimenting with |
| different settings to see how they affect the code size and do not want |
| to reenter all the setting values in the <code class="docutils literal notranslate"><span class="pre">newt</span> <span class="pre">target</span> <span class="pre">set</span></code> command, |
| you can use the <code class="docutils literal notranslate"><span class="pre">newt</span> <span class="pre">target</span> <span class="pre">amend</span></code> command. This command adds or |
| updates only the settings specified in the command and does not |
| overwrite other setting values. While you can also edit the target |
| <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file directly, we recommend that you use the |
| <code class="docutils literal notranslate"><span class="pre">newt</span> <span class="pre">target</span></code> commands.</p> |
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