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abstracting display, touch and sd

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Adolfo Reyna
2026-01-28 20:12:41 -05:00
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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=utf-8">
<meta http-equiv="Content-Style-Type" content="text/css">
<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
<title>FatFs - get_fattime</title>
</head>
<body>
<div class="para func">
<h2>get_fattime</h2>
<p>The get_fattime function is called to get the current time.</p>
<pre>
DWORD get_fattime (void);
</pre>
</div>
<div class="para ret">
<h4>Return Value</h4>
<p>Currnet local time shall be returned as bit-fields packed into a <tt>DWORD</tt> value. The bit fields are as follows:</p>
<dl class="ret">
<dt>bit31:25</dt>
<dd>Year origin from the 1980 (0..127, e.g. 37 for 2017)</dd>
<dt>bit24:21</dt>
<dd>Month (1..12)</dd>
<dt>bit20:16</dt>
<dd>Day of the month (1..31)</dd>
<dt>bit15:11</dt>
<dd>Hour (0..23)</dd>
<dt>bit10:5</dt>
<dd>Minute (0..59)</dd>
<dt>bit4:0</dt>
<dd>Second / 2 (0..29, e.g. 25 for 50)</dd>
</dl>
</div>
<div class="para desc">
<h4>Description</h4>
<p>The <tt>get_fattime</tt> function shall return any valid time even if the system does not support a real time clock. If a zero is returned, the file will not have a valid timestamp.</p>
</div>
<div class="para comp">
<h4>QuickInfo</h4>
<p>This function is not needed when <tt><a href="config.html#fs_readonly">FF_FS_READONLY</a> == 1</tt> or <tt><a href="config.html#fs_nortc">FF_FS_NORTC</a> == 1</tt>.</p>
</div>
<div class="para use">
<h4>Example</h4>
<pre>
DWORD get_fattime (void)
{
time_t t;
struct tm *stm;
t = time(0);
stm = localtime(&t);
return (DWORD)(stm->tm_year - 80) &lt;&lt; 25 |
(DWORD)(stm->tm_mon + 1) &lt;&lt; 21 |
(DWORD)stm->tm_mday &lt;&lt; 16 |
(DWORD)stm->tm_hour &lt;&lt; 11 |
(DWORD)stm->tm_min &lt;&lt; 5 |
(DWORD)stm->tm_sec &gt;&gt; 1;
}
</pre>
</div>
<p class="foot"><a href="../index.html">Return</a></p>
</body>
</html>