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Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [Common/] [FileSystem/] [FatFs-0.7e/] [doc/] [en/] [dread.html] - Rev 637
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta http-equiv="Content-Style-Type" content="text/css"> <link rel="up" title="FatFs" href="../00index_e.html"> <link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"> <title>FatFs - disk_read</title> </head> <body> <div class="para"> <h2>disk_read</h2> <p>The disk_read function reads sector(s) from the disk drive.</p> <pre> DRESULT disk_read ( BYTE <em>Drive</em>, /* Physical drive number */ BYTE* <em>Buffer</em>, /* Pointer to the read data buffer */ DWORD <em>SectorNumber</em>, /* Start sector number */ BYTE <em>SectorCount</em> /* Number of sectros to read */ ); </pre> </div> <div class="para"> <h4>Parameters</h4> <dl class="par"> <dt>Drive</dt> <dd>Specifies the physical drive number.</dd> <dt>Buffer</dt> <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> <dt>SectorNumber</dt> <dd>Specifies the start sector number in logical block address (LBA).</dd> <dt>SectorCount</dt> <dd>Specifies number of sectors to read. The value can be 1 to 255.</dd> </dl> </div> <div class="para"> <h4>Return Value</h4> <dl class="ret"> <dt>RES_OK (0)</dt> <dd>The function succeeded.</dd> <dt>RES_ERROR</dt> <dd>Any hard error occured during the read operation and could not recover it.</dd> <dt>RES_PARERR</dt> <dd>Invalid parameter.</dd> <dt>RES_NOTRDY</dt> <dd>The disk drive has not been initialized.</dd> </dl> </div> <p class="foot"><a href="../00index_e.html">Return</a></p> </body> </html>
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