savelij13
625f3adcbb
- Added f_getcwd(). (_FS_RPATH = 2) - Added sector erase feature. (_USE_ERASE) - Moved file lock semaphore table from fs object to the bss. - Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'. - Fixed f_mkfs() creates wrong FAT32 volume.
60 lines
2.2 KiB
HTML
60 lines
2.2 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="alternate" hreflang="ja" title="Japanese" href="../ja/dread.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>, <span>/* Physical drive number */</span>
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BYTE* <em>Buffer</em>, <span>/* Pointer to the read data buffer */</span>
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DWORD <em>SectorNumber</em>, <span>/* Start sector number */</span>
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BYTE <em>SectorCount</em> <span>/* Number of sectros to read */</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>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 <em>byte array</em> to store the read data. The buffer size of number of bytes to be read, sector size * sector count, is required. Note that the specified memory address is not that always aligned to word boundary. If the hardware does not support misaligned data transfer, it must be solved in this function.</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 128. Generally, a multiple sector transfer request must not be split into single sector transactions to the device, or you may not get good read performance.</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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