savelij13
47e601681a
- Fixed a complie error when FF_FS_LOCK != 0. - Fixed a potential issue when work FatFs concurrency with FF_FS_REENTRANT, FF_VOLUMES >= 2 and FF_FS_LOCK > 0. - Made f_setlabel() accept a volume label in Unix style volume ID when FF_STR_VOLUME_ID == 2. - Made FatFs update PercInUse field in exFAT VBR. (A preceding f_getfree() is needed for the accuracy)
70 lines
2.0 KiB
HTML
70 lines
2.0 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=utf-8">
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<meta http-equiv="Content-Style-Type" content="text/css">
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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 - f_chdrive</title>
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</head>
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<body>
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<div class="para func">
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<h2>f_chdrive</h2>
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<p>The f_chdrive function changes the current drive.</p>
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<pre>
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FRESULT f_chdrive (
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const TCHAR* <span class="arg">path</span> <span class="c">/* [IN] Logical drive number */</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>path</dt>
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<dd>Specifies the <a href="filename.html">logical drive number</a> to be set as the current drive.</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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<p>
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<a href="rc.html#ok">FR_OK</a>,
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<a href="rc.html#id">FR_INVALID_DRIVE</a>
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</p>
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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 <tt>f_chdrive</tt> function changes only the current drive. The initial value of the current drive number is 0. In Unix style drive prefix configuration, this function will not be needed because <tt>f_chdir</tt> function changes also the current drive. Note that the current drive is retained in a static variable, so that it also affects other tasks that using the file functions.</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>Available when <tt><a href="config.html#fs_rpath">FF_FS_RPATH</a> >= 1</tt>.</p>
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</div>
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<div class="para use">
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<h4>Example</h4>
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<pre>
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<em>f_chdrive</em>("2:"); <span class="c">/* Set drive 2 as current drive */</span>
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<em>f_chdrive</em>(""); <span class="c">/* No effect (set current drive as current drive) */</span>
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</pre>
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</div>
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<div class="para ref">
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<h4>See Also</h4>
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<p><tt><a href="chdir.html">f_chdir</a>, <a href="getcwd.html">f_getcwd</a></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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