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| <div class="section" id="struct-nffs-area-desc"> |
| <h1>struct nffs_area_desc<a class="headerlink" href="#struct-nffs-area-desc" title="Permalink to this headline">¶</a></h1> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">nffs_area_desc</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">nad_offset</span><span class="p">;</span><span class="w"> </span><span class="cm">/* Flash offset of start of area. */</span> |
| <span class="w"> </span><span class="kt">uint32_t</span><span class="w"> </span><span class="n">nad_length</span><span class="p">;</span><span class="w"> </span><span class="cm">/* Size of area, in bytes. */</span> |
| <span class="w"> </span><span class="kt">uint8_t</span><span class="w"> </span><span class="n">nad_flash_id</span><span class="p">;</span><span class="w"> </span><span class="cm">/* Logical flash id */</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| <p>Descriptor for a single nffs area. An area is a region of disk with the |
| following properties:</p> |
| <ol class="arabic simple"> |
| <li><p>An area can be fully erased without affecting any other areas.</p></li> |
| <li><p>Writing to one area does not restrict writes to other areas.</p></li> |
| </ol> |
| <p><strong>Regarding property 1:</strong> Generally, flash hardware divides its memory |
| space into “blocks.” When erasing flash, entire blocks must be erased in |
| a single operation; partial erases are not possible.</p> |
| <p><strong>Regarding property 2:</strong> Furthermore, some flash hardware imposes a |
| restriction with regards to writes: writes within a block must be |
| strictly sequential. For example, if you wish to write to the first 16 |
| bytes of a block, you must write bytes 1 through 15 before writing byte |
| 16. This restriction only applies at the block level; writes to one |
| block have no effect on what parts of other blocks can be written.</p> |
| <p>Thus, each area must comprise a discrete number of blocks.</p> |
| <p>An array of area descriptors is terminated by an entry with a |
| <em>nad_length</em> value of 0.</p> |
| <div class="section" id="notes"> |
| <h2>Notes<a class="headerlink" href="#notes" title="Permalink to this headline">¶</a></h2> |
| <p>Typically, a product’s flash layout is exposed via its BSP-specific |
| <code class="docutils literal notranslate"><span class="pre">bsp_flash_dev()</span></code> function. This function retrieves the layout of the |
| specified flash device resident in the BSP. The result of this function |
| can then be converted into the <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">nffs_area_desc[]</span></code> that nffs |
| requires.</p> |
| </div> |
| <div class="section" id="header-file"> |
| <h2>Header file<a class="headerlink" href="#header-file" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"nffs/nffs.h"</span> |
| </pre></div> |
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