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7<title>GetLatestVsyncTiming</title>
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10<h1><CODE>nn::camera::CTR::GetLatestVsyncTiming</CODE> Function</h1>
11<h2>Syntax</h2>
12    <div class="section">
13      <pre class="definition">
14void GetLatestVsyncTiming(
15     <a href="../../../nn/fnd/TimeSpan/Overview.html">nn::fnd::TimeSpan</a> * pTime,
16     <a href="../../../nn/camera/CTR/Port.html">Port</a> port,
17     size_t past = 1
18);
19</pre>
20    </div>
21<h2>Arguments</h2>
22    <div class="section">
23      <table class="arguments">
24        <thead>
25          <tr>
26            <td width="15" />
27<th>Name</th>
28<td>Description</td>
29          </tr>
30        </thead>
31        <tr>
32<td>out</td>
33<th>pTime</th>
34<td>Specifies the location where the timing is stored.</td>
35        </tr>
36        <tr>
37<td>in</td>
38<th>port</th>
39<td>Specifies the port to which the camera to get the timing of is connected.</td>
40        </tr>
41        <tr>
42<td>in</td>
43<th>past</th>
44<td>Specifies the number of past timing values to obtain. Specify this as an integer between 1 and 5. It will default to 1 if omitted. The <SPAN class="argument">pTime</SPAN> argument will store the timing values for recent <SPAN class="argument">past</SPAN> V-Sync events, starting with the most recent one. The <SPAN class="argument">pTime</SPAN> argument must therefore be allocated with enough space to store <SPAN class="argument">past</SPAN> V-Sync timings. That said, if the number of V-Sync signals input since the camera was activated (we'll call this number &quot;frame&quot; for the sake of convenience) is smaller than the value of <CODE>past</CODE>, indeterminate values are stored for the values between <CODE>pTime[frame]</CODE> and <CODE>pTime[past-1]</CODE>.</td>
45        </tr> </table>
46    </div>
47<h2>Return Values</h2>
48    <div class="section">
49None.
50               </div>
51<h2>Description</h2>
52    <div class="section">
53<p>Gets the timing history of camera V-Sync signal inputs.</p><p>Internally, the camera interrupt handler does this by obtaining the tick value.</p><!-- write here --></div>
54<h2>Revision History</h2>
55    <div class="section">
56      <dl class="history">
57        <dt>2010/10/30</dt>
58<dd>Corrected the erroneous description regarding the value stored when the frame count after startup is smaller than the number specified by the argument (TimeSpan(0)→indeterminate value).<br />
59        </dd>
60        <dt>2010/04/13</dt>
61<dd>Initial version.<br />
62        </dd>
63      </dl>
64    </div>
65  <hr><p>CONFIDENTIAL</p></body>
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