59 lines
1.9 KiB
HTML
59 lines
1.9 KiB
HTML
<!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="FatFs" href="../00index_e.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - disk_read</title>
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</head>
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<body>
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<div class="para">
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<h2>disk_read</h2>
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<p>The disk_read function reads sector(s) from the disk drive.</p>
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<pre>
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DRESULT disk_read (
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BYTE <em>Drive</em>, /* Physical drive number */
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BYTE* <em>Buffer</em>, /* Pointer to the read data buffer */
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DWORD <em>SectorNumber</em>, /* Start sector number */
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BYTE <em>SectorCount</em> /* Number of sectros to read */
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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>Drive</dt>
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<dd>Specifies the physical drive number.</dd>
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<dt>Buffer</dt>
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<dd>Pointer to the byte array to store the read data. The buffer size of number of bytes to be read, sector size * sector count, is required. The memory address specified by upper layer may or may not be aligned to word boundary.</dd>
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<dt>SectorNumber</dt>
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<dd>Specifies the start sector number in logical block address (LBA).</dd>
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<dt>SectorCount</dt>
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<dd>Specifies number of sectors to read. The value can be 1 to 255.</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 read operation and could not recover it.</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 disk drive has not been initialized.</dd>
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</dl>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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