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Add a header file that defines a standard watchdog timer driver

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4603 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2012-04-13 22:22:41 +00:00
parent b805e0fd2e
commit 6534da24e4
1 changed files with 33 additions and 3 deletions
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36
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 23, 2011</p>
<p>Last Updated: April 13, 2011</p>
</td>
</tr>
</table>
@ -129,7 +129,8 @@
<a href="#analogdrivers">6.3.11 Analog (ADC/DAC) Drivers</a><br>
<a href="#pwmdrivers">6.3.12 PWM Drivers</a><br>
<a href="#candrivers">6.3.13 CAN Drivers</a><br>
<a href="#quadencoder">6.3.14 Quadrature Encoder Drivers</a>
<a href="#quadencoder">6.3.14 Quadrature Encoder Drivers</a><br>
<a href="#wdogdriver">6.3.15 Watchdog Timer Drivers</a>
</ul>
<a href="#pwrmgmt">6.4 Power Management</a>
<ul>
@ -3261,7 +3262,7 @@ extern void up_ledoff(int led);
<h3><a name="quadencoder">6.3.14 Quadrature Encoder Drivers</a></h3>
<p>
NuttX supports only a low-level, two-part Quadrature Driver driver.
NuttX supports a low-level, two-part Quadrature Encoder driver.
</p>
<ol>
<li>
@ -3288,6 +3289,35 @@ extern void up_ledoff(int led);
</li>
</ul>
<h3><a name="wdogdriver">6.3.15 Watchdog Timer Drivers</a></h3>
<p>
NuttX supports a low-level, two-part watchdog timer driver.
</p>
<ol>
<li>
An &quot;upper half&quot;, generic driver that provides the comman watchdog timer interface to application level code, and
</li>
<li>
A &quot;lower half&quot;, platform-specific driver that implements the low-level timer controls to implement the watchdog timer functionality.
</li>
</ol>
<p>
Files supporting the watchdog timer can be found in the following locations:
</p>
<ul>
<li><b>Interface Definition</b>.
The header file for the NuttX watchdog timer driver reside at <code>include/nuttx/watchdog.h</code>.
This header file includes both the application level interface to the watchdog timer driver as well as the interface between the &quot;upper half&quot; and &quot;lower half&quot; drivers.
The watchdog timer driver uses a standard character driver framework.
</li>
<li><b>&quot;Upper Half&quot; Driver</b>.
The generic, &quot;upper half&quot; watchdog timer driver resides at <code>drivers/watchdog.c</code>.
</li>
<li><b>&quot;Lower Half&quot; Drivers</b>.
Platform-specific watchdog timer drivers reside in <code>arch/</code><i>&lt;architecture&gt;</i><code>/src/</code><i>&lt;chip&gt;</i> directory for the specific processor <i>&lt;architecture&gt;</i> and for the specific <i>&lt;chip&gt;</i> watchdog timer peripheral devices.
</li>
</ul>
<h2><a name="pwrmgmt">6.4 Power Management</a></h2>
<h3><a name="pmoverview">6.4.1 Overview</a></h3>