savelij13
a6bc2e0f07
- Changed heading character of configuration keywords "_" to "FF_". - Removed ASCII-only configuration, FF_CODE_PAGE = 1. Use FF_CODE_PAGE = 437 instead. - Added f_setcp(), run-time code page configuration. (FF_CODE_PAGE = 0) - Improved cluster allocation time on stretch a deep buried cluster chain. - Improved processing time of f_mkdir() with large cluster size by using FF_USE_LFN = 3. - Improved NoFatChain flag of the fragmented file to be set after it is truncated and got contiguous. - Fixed archive attribute is left not set when a file on the exFAT volume is renamed. (appeared at R0.12) - Fixed exFAT FAT entry can be collapsed when write or lseek operation to the existing file is done. (appeared at R0.12c) - Fixed creating a file can fail when a new cluster allocation to the exFAT directory occures. (appeared at R0.12c)
77 lines
3.3 KiB
HTML
77 lines
3.3 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/dwrite.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_write</title>
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</head>
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<body>
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<div class="para func">
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<h2>disk_write</h2>
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<p>The disk_write function is called to write data to the sector(s) of storage device.</p>
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<pre>
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DRESULT disk_write (
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BYTE <span class="arg">drv</span>, <span class="c">/* [IN] Physical drive number */</span>
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const 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">sector</span>, <span class="c">/* [IN] Sector number to write from */</span>
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UINT <span class="arg">count</span> <span class="c">/* [IN] Number of sectors to write */</span>
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);
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</pre>
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</div>
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<div class="para arg">
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<h4>Parameters</h4>
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<dl class="par">
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<dt>pdrv</dt>
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<dd>Physical drive number to identify the target device.</dd>
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<dt>buff</dt>
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<dd>Pointer to the first item of the <em>byte array</em> to be written. The size of data to be written is sector size * <tt class="arg">count</tt> bytes.</dd>
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<dt>sector</dt>
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<dd>Start sector number in 32-bit LBA.</dd>
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<dt>count</dt>
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<dd>Number of sectors to write.</dd>
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</dl>
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</div>
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<div class="para ret">
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<h4>Return Values</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>A hard error occured during the write operation and could not recover it.</dd>
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<dt>RES_WRPRT</dt>
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<dd>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 desc">
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<h4>Description</h4>
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<p>The specified memory address is not that always aligned to word boundary because the argument is defined as <tt>BYTE*</tt>. For more information, refer to the description of <a href="dread.html"><tt>disk_read</tt></a> function.</p>
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<p>Generally, a multiple sector transfer request must not be split into single sector transactions to the storage device, or the write throughput will be drastically decreased.</p>
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<p>FatFs expects delayed write function of the disk control layer. The write operation to the media does not need to be completed at return from this function by what write operation is in progress or data is only stored into the write-back cache. But write data on the <tt class="arg">buff</tt> is invalid after return from this function. The write completion request is done by <tt>CTRL_SYNC</tt> command of <tt><a href="dioctl.html">disk_ioctl</a></tt> function. Therefore, if a delayed write function is implemented, the write throughput of the filesystem will be improved.</p>
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<p><em>Remarks: Application program MUST NOT call this function, or FAT structure on the volume can be collapsed.</em></p>
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</div>
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<div class="para comp">
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<h4>QuickInfo</h4>
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<p>This function is not needed when <tt>FF_FS_READONLY == 1</tt>.</p>
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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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