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| <div class="section" id="the-fat-file-system"> |
| <h1>The FAT File System<a class="headerlink" href="#the-fat-file-system" title="Permalink to this headline">¶</a></h1> |
| <p>Mynewt provides an implementation of the FAT filesystem which is |
| currently supported on MMC/SD cards.</p> |
| <div class="section" id="description"> |
| <h2>Description<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2> |
| <blockquote> |
| <div><p>File Allocation Table (FAT) is a computer file system architecture |
| and a family of industry-standard file systems utilizing it. The FAT |
| file system is a legacy file system which is simple and robust. It |
| offers good performance even in lightweight implementations, but |
| cannot deliver the same performance, reliability and scalability as |
| some modern file systems.</p> |
| </div></blockquote> |
| </div> |
| <div class="section" id="configuration"> |
| <h2>Configuration<a class="headerlink" href="#configuration" title="Permalink to this headline">¶</a></h2> |
| <p><code class="docutils literal notranslate"><span class="pre">fatfs</span></code> configuration can be tweaked by editing |
| <code class="docutils literal notranslate"><span class="pre">fs/fatfs/include/fatfs/ffconf.h</span></code>. The current configuraton was chosen |
| to minimize memory use and some options address limitations existing in |
| the OS:</p> |
| <ul class="simple"> |
| <li><p>Write support is enabled by default (can be disabled to minimize |
| memory use).</p></li> |
| <li><p>Long filename (up to 255) support is disabled.</p></li> |
| <li><p>When writing files, time/dates are not persisted due to current lack |
| of a standard <code class="docutils literal notranslate"><span class="pre">hal_rtc</span></code> interface.</p></li> |
| <li><p>No unicode support. Vanilla config uses standard US codepage 437.</p></li> |
| <li><p>Formatting of new volumes is disabled.</p></li> |
| <li><p>Default number of volumes is configured to 1.</p></li> |
| </ul> |
| </div> |
| <div class="section" id="api"> |
| <h2>API<a class="headerlink" href="#api" title="Permalink to this headline">¶</a></h2> |
| <p>To include <code class="docutils literal notranslate"><span class="pre">fatfs</span></code> on a project just include it as a dependency in |
| your project:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>pkg.deps: |
| - "@apache-mynewt-core/fs/fatfs" |
| </pre></div> |
| </div> |
| <p>It can now be used through the standard file system abstraction |
| functions as described in <a class="reference external" href="/os/modules/fs/fs/fs#API">FS API</a>.</p> |
| <div class="section" id="example"> |
| <h3>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h3> |
| <p>An example of using <code class="docutils literal notranslate"><span class="pre">fatfs</span></code> on a MMC card is provided on the |
| <a class="reference external" href="/os/modules/drivers/mmc#Example">MMC</a> documentation.</p> |
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