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| <h2 id="struct-nffs_area_desc"><font color="F2853F" style="font-size:24pt">struct nffs_area_desc</font></h2> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">struct</span> <span style="color: #3F6E75">nffs_area_desc</span> { |
| <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">nad_offset</span>; <span style="color: #177500">/* Flash offset of start of area. */</span> |
| <span style="color: #A90D91">uint32_t</span> <span style="color: #000000">nad_length</span>; <span style="color: #177500">/* Size of area, in bytes. */</span> |
| <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">nad_flash_id</span>; <span style="color: #177500">/* Logical flash id */</span> |
| }; |
| </code></pre></div> |
| |
| <p>Descriptor for a single nffs area. An area is a region of disk with the following properties:</p> |
| <ol> |
| <li>An area can be fully erased without affecting any other areas.</li> |
| <li>Writing to one area does not restrict writes to other areas.</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> |
| <h4 id="notes">Notes</h4> |
| <p>Typically, a product's flash layout is exposed via its BSP-specific <code>bsp_flash_dev()</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>struct nffs_area_desc[]</code> that nffs requires.</p> |
| <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> |
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