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| <h1 id="the-fat-file-system">The FAT File System</h1> |
| <p>Mynewt provides an implementation of the FAT filesystem which is currently |
| supported on MMC/SD cards.</p> |
| <h3 id="description">Description</h3> |
| <blockquote> |
| <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> |
| </blockquote> |
| <h3 id="configuration">Configuration</h3> |
| <p><code>fatfs</code> configuration can be tweaked by editing <code>fs/fatfs/include/fatfs/ffconf.h</code>. |
| The current configuraton was chosen to minimize memory use and some options address |
| limitations existing in the OS:</p> |
| <ul> |
| <li>Write support is enabled by default (can be disabled to minimize memory use).</li> |
| <li>Long filename (up to 255) support is disabled.</li> |
| <li>When writing files, time/dates are not persisted due to current lack of a |
| standard <code>hal_rtc</code> interface.</li> |
| <li>No unicode support. Vanilla config uses standard US codepage 437.</li> |
| <li>Formatting of new volumes is disabled.</li> |
| <li>Default number of volumes is configured to 1.</li> |
| </ul> |
| <h3 id="api">API</h3> |
| <p>To include <code>fatfs</code> on a project just include it as a dependency in your |
| project:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.deps: |
| - fs/fatfs |
| </code></pre></div> |
| |
| <p>It can now be used through the standard file system abstraction functions as |
| described in <a href="/os/modules/fs/fs/fs#API">FS API</a>.</p> |
| <h4 id="example">Example</h4> |
| <p>An example of using <code>fatfs</code> on a MMC card is provided on the |
| <a href="/os/modules/drivers/mmc#Example">MMC</a> documentation.</p> |
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