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Minor update to PM discussion in the porting guide

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Gregory Nutt 2016-03-28 08:06:27 -06:00
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1 changed files with 12 additions and 2 deletions
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Documentation/NuttxPortingGuide.html
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@ -12,7 +12,7 @@
<h1><big><font color="#3c34ec">
<i>NuttX RTOS Porting Guide</i>
</font></big></h1>
<p>Last Updated: March 13, 2016</p>
<p>Last Updated: March 28, 2016</p>
</td>
</tr>
</table>
@ -5580,12 +5580,13 @@ int kbd_decode(FAR struct lib_instream_s *stream, FAR struct kbd_getstate_s *sta
<h3><a name="pmoverview">6.4.1 Overview</a></h3>
<p>
<b>Power Management (PM) Sub-System</b>.
NuttX supports a simple power management (PM) sub-system. This sub-system:
</p>
<ul>
<li>
<p>
Monitors driver activity, and
Monitors activity from drivers (and from other parts of the syste), and
</p>
</li>
<li>
@ -5624,6 +5625,7 @@ int kbd_decode(FAR struct lib_instream_s *stream, FAR struct kbd_getstate_s *sta
</li>
</ul>
<p>
<b>Low Power Consumption States</b>.
Various &quot;sleep&quot; and low power consumption states have various names and are sometimes used in conflicting ways.
In the NuttX PM logic, we will use the following terminology:
</p>
@ -5652,6 +5654,14 @@ int kbd_decode(FAR struct lib_instream_s *stream, FAR struct kbd_getstate_s *sta
These various states are represented with type <code>enum pm_state_e</code> in <code>include/nuttx/power/pm.h</code>.
</p>
<p>
<b>Power Management Domains</b>.
Each PM interfaces includes a integer <i>domain</i> number.
By default, only a single power domain is supported (<code>CONFIG_PM_NDOMAINS=1</code>).
But that is configurable; any number of PM domains can be supported.
Multiple PM domains might be useful, for example, if you would want to control power states associated with a network separately from power states associated with a user interface.
</p>
<h3><a name="pminterfaces">6.4.2 Interfaces</a></h3>
<p>
All PM interfaces are declared in the file <code>include/nuttx/power/pm.h</code>.