211 lines
13 KiB
HTML
211 lines
13 KiB
HTML
|
<?xml version="1.0" encoding="utf-8"?>
|
|||
|
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
|||
|
|
<html xmlns:MadCap="http://www.madcapsoftware.com/Schemas/MadCap.xsd" MadCap:lastBlockDepth="6" MadCap:lastHeight="94" MadCap:lastWidth="853" MadCap:disableMasterStylesheet="true" MadCap:tocPath="" MadCap:InPreviewMode="false" MadCap:PreloadImages="false" MadCap:RuntimeFileType="Topic" MadCap:TargetType="WebHelp" lang="en-us" xml:lang="en-us" MadCap:PathToHelpSystem="../../../" MadCap:HelpSystemFileName="Default.xml" MadCap:SearchType="Stem">
|
|||
|
|
<head><title>SLEEP</title>
|
|||
|
|
<link href="../../SkinSupport/MadCap.css" rel="stylesheet" />
|
|||
|
|
<link href="../../Resources/Stylesheets/BSE_Help.css" rel="stylesheet" />
|
|||
|
|
<script src="../../SkinSupport/MadCapAll.js" type="text/javascript">
|
|||
|
|
</script>
|
|||
|
|
</head>
|
|||
|
|
<body>
|
|||
|
|
<h1 class="code">SLEEP</h1>
|
|||
|
|
<div class="ImagePlusCaption">
|
|||
|
|
<div class="Col2">
|
|||
|
|
<p>
|
|||
|
|
<img src="../../graphics/pgm_icon1.gif" border="0" alt="BS1 icon" title="BS1 icon" />
|
|||
|
|
<img src="../../graphics/pgm_icon2.gif" border="0" alt="BS2 icon" title="BS2 icon" />
|
|||
|
|
<img src="../../graphics/pgm_icon2e.gif" border="0" alt="BS2e icon" title="BS2e icon" />
|
|||
|
|
<img src="../../graphics/pgm_icon2sx.gif" border="0" alt="BS2sx icon" title="BS2sx icon" />
|
|||
|
|
<img src="../../graphics/pgm_icon2p.gif" border="0" alt="BS2p icon" title="BS2p icon" />
|
|||
|
|
<img src="../../graphics/pgm_icon2pe.gif" border="0" alt="BS2pe icon" title="BS2pe icon" />
|
|||
|
|
<img src="../../graphics/pgm_icon2px.gif" border="0" alt="BS2px icon" title="BS2px icon" />
|
|||
|
|
</p>
|
|||
|
|
</div>
|
|||
|
|
<p style="text-align: right;"><a href="../ExampleTopics/SleepEx.htm" target="" title="" alt="" class="MCXref_0">SLEEP Example</a>
|
|||
|
|
</p>
|
|||
|
|
<p> </p>
|
|||
|
|
</div>
|
|||
|
|
<p class="clear"> </p>
|
|||
|
|
<p> </p>
|
|||
|
|
<p class="PlainText">Syntax: <span class="keyword_in_text">SLEEP</span> <![CDATA[ ]]><i>Duration</i></p>
|
|||
|
|
<h2>Function</h2>
|
|||
|
|
<p class="PlainText">Put the BASIC Stamp into low-power mode for a specified period of time.
|
|||
|
|
|
|||
|
|
</p>
|
|||
|
|
<ul>
|
|||
|
|
<li value="1"><b><i>Duration</i></b> is a variable/constant/expression* (1 - 65535) that
|
|||
|
|
specifies the duration of sleep. The unit of time for <i>Duration</i> is one
|
|||
|
|
second, though the BASIC Stamp rounds up to the nearest multiple of 2.3
|
|||
|
|
seconds. </li>
|
|||
|
|
</ul>
|
|||
|
|
<p class="PlainText">*<img src="../../graphics/bs1note.gif" style="vertical-align: super;" /> Note: expressions are not allowed as arguments on the BS1.</p>
|
|||
|
|
<h2>Quick Facts</h2>
|
|||
|
|
<table cellpadding="4" cellspacing="0" border="1" style="caption-side: top;width: 100%;">
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<tr align="center" bgcolor="#CFCFCF">
|
|||
|
|
<td width="16%"> </td>
|
|||
|
|
<td width="12%">BS1</td>
|
|||
|
|
<td width="12%">BS2</td>
|
|||
|
|
<td width="12%">BS2e</td>
|
|||
|
|
<td width="12%">BS2sx</td>
|
|||
|
|
<td width="12%">BS2p</td>
|
|||
|
|
<td width="12%">BS2pe</td>
|
|||
|
|
<td width="12%">BS2px</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr align="center">
|
|||
|
|
<td bgcolor="#CFCFCF">Current Draw<br></br>during Run</td>
|
|||
|
|
<td>1 mA</td>
|
|||
|
|
<td>3 mA</td>
|
|||
|
|
<td>25 mA</td>
|
|||
|
|
<td>60 mA</td>
|
|||
|
|
<td>40 mA</td>
|
|||
|
|
<td>15 mA</td>
|
|||
|
|
<td>55 mA</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr align="center">
|
|||
|
|
<td bgcolor="#CFCFCF">Current Draw<br></br>during <span class="keyword_in_text">SLEEP</span></td>
|
|||
|
|
<td>25 µA</td>
|
|||
|
|
<td>50 µA</td>
|
|||
|
|
<td>200 µA</td>
|
|||
|
|
<td>500 µA</td>
|
|||
|
|
<td>350 µA</td>
|
|||
|
|
<td>36 µA</td>
|
|||
|
|
<td>450 µA</td>
|
|||
|
|
</tr>
|
|||
|
|
<TR ALIGN="center">
|
|||
|
|
<TD BGCOLOR="#CFCFCF">Related Commands</TD>
|
|||
|
|
<TD COLSPAN="4"><a href="END.htm" target="" title="" alt="" class="MCXref_0">END</a> , <a href="NAP.htm" target="" title="" alt="" class="MCXref_0">NAP</a></TD>
|
|||
|
|
<TD COLSPAN="3"><a href="END.htm" target="" title="" alt="" class="MCXref_0">END</a>, <a href="NAP.htm" target="" title="" alt="" class="MCXref_0">NAP</a>, <a href="POLLWAIT.htm" target="" title="" alt="" class="MCXref_0">POLLWAIT</a></TD>
|
|||
|
|
</TR>
|
|||
|
|
<tr align="center">
|
|||
|
|
<td bgcolor="#CFCFCF">Accuracy of <span class="keyword_in_text">SLEEP</span></td>
|
|||
|
|
<td colspan="8">±1% @ 75°F with stable power supply</td>
|
|||
|
|
</tr>
|
|||
|
|
</table>
|
|||
|
|
<h2>Explanation</h2>
|
|||
|
|
<p class="PlainText"><span class="keyword_in_text">SLEEP</span> allows the BASIC Stamp to turn itself off, then turn back on after
|
|||
|
|
a programmed duration. The length of <span class="keyword_in_text">SLEEP</span> can range from 2.3 seconds
|
|||
|
|
to slightly over 18 hours. Power consumption is reduced to the amount described
|
|||
|
|
in the table above, assuming no loads are being driven. </p>
|
|||
|
|
<h3><a name="Sleep"></a>Sleep Units vs Sleep Resolution</h3>
|
|||
|
|
<p class="PlainText">The units for <b style="font-style: italic;">Duration</b> are 1 second, but the resolution of the
|
|||
|
|
<span class="keyword_in_text">SLEEP</span> instruction is 2.304 seconds. <span class="keyword_in_text">SLEEP</span> rounds the specified
|
|||
|
|
number of seconds up to the nearest multiple of 2.304. Because of this, <b style="font-style: italic;">Duration</b> values below 10 are not very accurate.</p>
|
|||
|
|
<table cellpadding="4" cellspacing="0" border="1" style="caption-side: top;width: 100%;">
|
|||
|
|
<col style="width: 279px;" />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<col />
|
|||
|
|
<tbody>
|
|||
|
|
<tr align="center" bgcolor="#CFCFCF">
|
|||
|
|
<td>When the <i>Duration</i> value is...</td>
|
|||
|
|
<td style="text-align: center;">1</td>
|
|||
|
|
<td style="text-align: center;">2</td>
|
|||
|
|
<td style="text-align: center;">3</td>
|
|||
|
|
<td style="text-align: center;">4</td>
|
|||
|
|
<td style="text-align: center;">5</td>
|
|||
|
|
<td style="text-align: center;">6</td>
|
|||
|
|
<td style="text-align: center;">7</td>
|
|||
|
|
<td style="text-align: center;">8</td>
|
|||
|
|
<td style="text-align: center;">9</td>
|
|||
|
|
<td style="text-align: center;">10</td>
|
|||
|
|
</tr>
|
|||
|
|
<tr>
|
|||
|
|
<td bgcolor="#CFCFCF">Sleep time (in seconds) is approximately...</td>
|
|||
|
|
<td style="text-align: center;">2.304</td>
|
|||
|
|
<td style="text-align: center;">2.304</td>
|
|||
|
|
<td style="text-align: center;">4.608</td>
|
|||
|
|
<td style="text-align: center;">4.608</td>
|
|||
|
|
<td style="text-align: center;">6.912</td>
|
|||
|
|
<td style="text-align: center;">6.912</td>
|
|||
|
|
<td style="text-align: center;">9.216</td>
|
|||
|
|
<td style="text-align: center;">9.216</td>
|
|||
|
|
<td style="text-align: center;">9.216</td>
|
|||
|
|
<td style="text-align: center;">11.52</td>
|
|||
|
|
</tr>
|
|||
|
|
</tbody>
|
|||
|
|
</table>
|
|||
|
|
<p> </p>
|
|||
|
|
<p class="PlainText">To estimate the actual sleeping period for any <i>Duration</i> value, use this equation:</p>
|
|||
|
|
<p class="PlainText">
|
|||
|
|
<img src="../../GeneratedImages/Equations/Equation1.png" style="width: 197px;height: 16px;" title="Equation for Sleep period" alt="Ceiling of Duration units divided by 2.304, result multiplied by 2.304" class="MCEquation mcReset" />
|
|||
|
|
</p>
|
|||
|
|
<p class="PlainText">The open-bottom square brackets indicate the <i>ceiling function</i>, which essentially means "round up the quantity inside to the next integer."</p>
|
|||
|
|
<p class="PlainText">For example, <span class="code_in_text">SLEEP 1</span> sleeps for 2.304 seconds:</p>
|
|||
|
|
<p>
|
|||
|
|
<img src="../../GeneratedImages/Equations/Equation2.png" style="width: 159px;height: 110px;" class="MCEquation mcReset" />
|
|||
|
|
</p>
|
|||
|
|
<p class="PlainText">And, <span class="code_in_text">SLEEP 10 </span>sleeps for approximately 11.52 seconds:</p>
|
|||
|
|
<p> </p>
|
|||
|
|
<p>
|
|||
|
|
<img src="../../GeneratedImages/Equations/Equation3.png" style="width: 169px;height: 110px;" class="MCEquation mcReset" />
|
|||
|
|
</p>
|
|||
|
|
<h3>The Watchdog Timer Improves Sleep Accuracy Automatically</h3>
|
|||
|
|
<p class="PlainText">Pins retain their previous I/O directions during <span class="keyword_in_text">SLEEP</span>. However, outputs
|
|||
|
|
are interrupted every 2.3 seconds during <span class="keyword_in_text">SLEEP</span> due to the way the chip keeps
|
|||
|
|
time. The alarm clock that wakes the BASIC Stamp up is called the watchdog timer.
|
|||
|
|
The watchdog is a resistor/capacitor oscillator built into the interpreter chip.
|
|||
|
|
During <span class="keyword_in_text">SLEEP</span>, the chip periodically wakes up and adjusts a counter to
|
|||
|
|
determine how long it has been asleep. If it isn't time to wake up, the chip "hits
|
|||
|
|
the snooze bar" and goes back to sleep. </p>
|
|||
|
|
<p class="PlainText">To ensure accuracy of <span class="keyword_in_text">SLEEP</span> intervals, the BASIC Stamp periodically
|
|||
|
|
compares the watchdog timer to the more-accurate resonator time base. It calculates
|
|||
|
|
a correction factor that it uses during <span class="keyword_in_text">SLEEP</span>. As a result, longer
|
|||
|
|
<span class="keyword_in_text">SLEEP</span> intervals are accurate to approximately ±1 percent.</p>
|
|||
|
|
<p class="PlainText">During execution of power conserving commands (<span class="keyword_in_text">END</span>, <span class="keyword_in_text">NAP</span>, <span class="keyword_in_text">POLLWAIT</span>, and <span class="keyword_in_text">SLEEP</span>), current will occasionally be interrupted
|
|||
|
|
on I/O pins for about 18 ms durations (60 µs on the BS2pe). The reason is that the
|
|||
|
|
watchdog-timer reset that awakens the BASIC Stamp during these commands also causes all of the pins to
|
|||
|
|
switch to input mode for approximately 18 ms (60 µs on the BS2pe). When the interpreter
|
|||
|
|
firmware regains control of the processor, it restores the I/O direction dictated
|
|||
|
|
by your program.</p>
|
|||
|
|
<p class="PlainText">If you plan to use <span class="keyword_in_text">END</span>, <span class="keyword_in_text">NAP</span>, <span class="keyword_in_text">POLLWAIT</span>, or <span class="keyword_in_text">SLEEP</span> in your programs,
|
|||
|
|
make sure that your loads can tolerate these power outages. The simplest solution
|
|||
|
|
is often to connect resistors high or low (to +5V or ground) as appropriate to
|
|||
|
|
ensure a continuing supply of current during the reset. </p>
|
|||
|
|
<p class="PlainText">The <a href="../ExampleTopics/SleepEx.htm" target="" title="" alt="" class="MCXref_0">SLEEP Example</a> can be used to demonstrate the
|
|||
|
|
effects of this reset with an LED and resistor.</p>
|
|||
|
|
<div class="Col2">
|
|||
|
|
<div class="MasterFoot">
|
|||
|
|
<p MadCap:conditions="BSEconditions.BSEWebHelp (Primary)-INCLUDE"><a href="../../HomeTopics/HomePage.htm">Go to Welcome page</a>
|
|||
|
|
</p>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div class="Col2">
|
|||
|
|
<div class="MasterFoot">
|
|||
|
|
<p style="text-align: right;"><span class="ContactInfoProjectName">BASIC Stamp Help</span> <![CDATA[ ]]><span class="ContactInfoVersion#">Version 2.5.4</span> <![CDATA[ ]]></p>
|
|||
|
|
<p style="text-align: right;">Copyright © <span class="ContactInfoCompanyName">Parallax Inc.</span></p>
|
|||
|
|
<p style="text-align: right;"><span class="SystemShortDate">8/8/2012</span>
|
|||
|
|
</p>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<script type="text/javascript">/* <![CDATA[ */
|
|||
|
|
|
|||
|
|
var _gaq = _gaq || [];
|
|||
|
|
_gaq.push(['_setAccount', 'UA-285614-1']);
|
|||
|
|
_gaq.push(['_trackPageview']);
|
|||
|
|
|
|||
|
|
(function() {
|
|||
|
|
var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
|
|||
|
|
ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
|
|||
|
|
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
|
|||
|
|
})();
|
|||
|
|
|
|||
|
|
/* ]]> */</script>
|
|||
|
|
<script type="text/javascript" src="../../SkinSupport/MadCapBodyEnd.js">
|
|||
|
|
</script>
|
|||
|
|
</body>
|
|||
|
|
</html>
|