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| <h2 id="nffs_detect"><font color="F2853F" style="font-size:24pt">nffs_detect</font></h2> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> <span style="color: #000000">nffs_detect</span>(<span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">nffs_area_desc</span> <span style="color: #000000">*area_descs</span>) |
| </code></pre></div> |
| |
| <p>Searches for a valid nffs file system among the specified areas. This function succeeds if a file system is detected among any subset of the supplied areas. If the area set does not contain a valid file system, a new one can be created via a separate call to nffs_format().</p> |
| <h4 id="arguments">Arguments</h4> |
| <table> |
| <thead> |
| <tr> |
| <th><em>Argument</em></th> |
| <th><em>Description</em></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>area_descs</td> |
| <td>The set of areas to search. This array must be terminated with a 0-length area.</td> |
| </tr> |
| </tbody> |
| </table> |
| <h4 id="returned-values">Returned values</h4> |
| <ul> |
| <li>0 on success</li> |
| <li>FS_ECORRUPT if no valid file system was detected</li> |
| <li>Other <a href="../../fs/fs_return_codes/">FS error code</a> on failure</li> |
| </ul> |
| <h4 id="header-file">Header file</h4> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #633820">#include</span> <span style="color: #177500">"nffs/nffs.h"</span> |
| </code></pre></div> |
| |
| <h4 id="example">Example</h4> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #177500">/*** hw/hal/include/hal/flash_map.h */</span> |
| |
| <span style="color: #177500">/*</span> |
| <span style="color: #177500"> * Flash area types</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #633820">#define FLASH_AREA_BOOTLOADER 0</span> |
| <span style="color: #633820">#define FLASH_AREA_IMAGE_0 1</span> |
| <span style="color: #633820">#define FLASH_AREA_IMAGE_1 2</span> |
| <span style="color: #633820">#define FLASH_AREA_IMAGE_SCRATCH 3</span> |
| <span style="color: #633820">#define FLASH_AREA_NFFS 4</span> |
| </code></pre></div> |
| |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #177500">/*** project/slinky/src/main.c */</span> |
| |
| <span style="color: #A90D91">int</span> |
| <span style="color: #000000">main</span>(<span style="color: #A90D91">int</span> <span style="color: #000000">argc</span>, <span style="color: #A90D91">char</span> <span style="color: #000000">**argv</span>) |
| { |
| <span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>; |
| <span style="color: #A90D91">int</span> <span style="color: #000000">cnt</span>; |
| |
| <span style="color: #177500">/* NFFS_AREA_MAX is defined in the BSP-specified bsp.h header file. */</span> |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">nffs_area_desc</span> <span style="color: #000000">descs</span>[<span style="color: #000000">NFFS_AREA_MAX</span>]; |
| |
| <span style="color: #177500">/* Initialize nffs's internal state. */</span> |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_init</span>(); |
| <span style="color: #000000">assert</span>(<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span>); |
| |
| <span style="color: #177500">/* Convert the set of flash blocks we intend to use for nffs into an array</span> |
| <span style="color: #177500"> * of nffs area descriptors.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #000000">cnt</span> <span style="color: #000000">=</span> <span style="color: #000000">NFFS_AREA_MAX</span>; |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">flash_area_to_nffs_desc</span>(<span style="color: #000000">FLASH_AREA_NFFS</span>, <span style="color: #000000">&cnt</span>, <span style="color: #000000">descs</span>); |
| <span style="color: #000000">assert</span>(<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span>); |
| |
| <span style="color: #177500">/* Attempt to restore an existing nffs file system from flash. */</span> |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">nffs_detect</span>(<span style="color: #000000">descs</span>) <span style="color: #000000">==</span> <span style="color: #000000">FS_ECORRUPT</span>) { |
| <span style="color: #177500">/* No valid nffs instance detected; format a new one. */</span> |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">nffs_format</span>(<span style="color: #000000">descs</span>); |
| <span style="color: #000000">assert</span>(<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span>); |
| } |
| <span style="color: #177500">/* [ ... ] */</span> |
| } |
| </code></pre></div> |
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