74 lines
2.8 KiB
HTML
74 lines
2.8 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="Petit FatFs" href="../00index_p.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<link rel="stylesheet" href="../css_p.css" type="text/css" media="screen" title="ELM Default">
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<title>Petit FatFs - disk_writep</title>
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</head>
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<body>
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<div class="para">
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<h2>disk_writep</h2>
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<p>The disk_writep function writes data to the sector.</p>
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<pre>
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DRESULT disk_writep (
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BYTE* <span class="arg">buff</span>, <span class="c">/* [IN] Pointer to the data to be written */</span>
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DWORD <span class="arg">sc</span>, <span class="c">/* [IN] Sector number or Number of bytes to wtite */</span>
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);
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</pre>
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</div>
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<div class="para">
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<h4>Parameters</h4>
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<dl class="par">
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<dt>buff</dt>
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<dd>Pointer to the data to be written to the sector. If a NULL is given, the function initiate/finalize a write transaction to the sector.</dd>
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<dt>sc</dt>
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<dd>Specifies nubmer of bytes to write if <tt class="arg">buff</tt> is not a NULL. If <tt class="arg">buff</tt> is a NULL and <tt class="arg">sc</tt> is not a zero, the function initiates a write transactin to the sector. If <tt class="arg">buff</tt> and <tt class="arg">sc</tt> are zero, the function finalize the current sector write transactin.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Return Value</h4>
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<dl class="ret">
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<dt>RES_OK (0)</dt>
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<dd>The function succeeded.</dd>
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<dt>RES_ERROR</dt>
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<dd>Any hard error occured during the write operation and could not recover it or the medium is write protected.</dd>
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<dt>RES_PARERR</dt>
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<dd>Invalid parameter.</dd>
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<dt>RES_NOTRDY</dt>
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<dd>The device has not been initialized.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Description</h4>
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<p>A sector write operation is done in following sequence.</p>
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<ol>
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<li><tt>disk_writep(0, sector_number);</tt> Initiate a sector write transaction.</li>
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<li><tt>disk_writep(data, byte_to_write);</tt> Start to write data to the sector.</li>
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<li><tt>disk_writep(data, byte_to_write);</tt> And data can be written upto 512 bytes with one or more calls.</li>
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<li><tt>disk_writep(data, byte_to_write);</tt> ...</li>
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<li><tt>disk_writep(0, 0);</tt> Finalize the write transaction. If number of bytes sent is less than 512, left bytes in the sector is filled by zero.</li>
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</ol>
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<p>If a write transaction is in progress, <tt>disk_readp()</tt> function will fail and <tt>disk_initialize()</tt> function finalize the current write transaction.</p>
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</div>
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<div class="para">
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<h4>Remarks</h4>
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<p>This funciton is needed when <tt>_USE_WRITE == 1</tt>.</p>
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</div>
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<p class="foot"><a href="../00index_p.html">Return</a></p>
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</body>
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</html>
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