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Add a test for PWM drivers

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4202 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2011-12-19 23:06:41 +00:00
parent 170c9ccab5
commit b65884fa3c
2 changed files with 53 additions and 5 deletions
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4
Documentation/NuttX.html
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@ -8,7 +8,7 @@
<tr align="center" bgcolor="#e4e4e4">
<td>
<h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
<p>Last Updated: December 6, 2011</p>
<p>Last Updated: December 19, 2011</p>
</td>
</tr>
</table>
@ -463,7 +463,7 @@
<td>
<p>
<li>
Network, USB (host), USB (device), serial, CAN, ADC, DAC driver architectures.
Network, USB (host), USB (device), serial, CAN, ADC, DAC, and PWM driver architectures.
</li>
</p>
</tr>

54
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: December 14, 2011</p>
<p>Last Updated: December 19, 2011</p>
</td>
</tr>
</table>
@ -126,7 +126,8 @@
<a href="#sdiodrivers">6.3.8 SDIO Device Drivers</a><br>
<a href="#usbhostdrivers">6.3.9 USB Host-Side Drivers</a><br>
<a href="#usbdevdrivers">6.3.10 USB Device-Side Drivers</a><br>
<a href="#analogdrivers">6.3.11 Analog (ADC/DAC) Drivers</a>
<a href="#analogdrivers">6.3.11 Analog (ADC/DAC) Drivers</a><br>
<a href="#pwmdrivers">6.3.12 PWM Drivers</a>
</ul>
<a href="#pwrmgmt">6.4 Power Management</a>
<ul>
@ -3120,9 +3121,21 @@ extern void up_ledoff(int led);
</ul>
<h3><a name="analogdrivers">6.3.11 Analog (ADC/DAC) Drivers</a></h3>
<p>
The NuttX PWM driver is split into two parts:
</p>
<ol>
<li>
An &quot;upper half&quot;, generic driver that provides the comman PWM 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 PWM functionality.
</li>
</ol>
<ul>
<li>
General header files for the NuttX analog reside in <code>include/nuttx/analog/</code>.
General header files for the NuttX analog drivers reside in <code>include/nuttx/analog/</code>.
These header files includes both the application level interface to the analog driver as well as the interface between the &quot;upper half&quot; and &quot;lower half&quot; drivers.
</li>
<li>
Common analog logic and share-able analog drivers reside in the <code>drivers/analog/</code>.
@ -3182,6 +3195,41 @@ extern void up_ledoff(int led);
</li>
</ul>
<h3><a name="pwmdrivers">6.3.12 PWM Drivers</a></h3>
<p>
For the purposes of this driver, a PWM device is any device that generates periodic output pulses of controlled frequency and pulse width.
Such a device might be used, for example, to perform pulse-width modulated output or frequency/pulse-count modulated output
(such as might be needed to control a stepper motor).
</p>
<p>
The NuttX PWM driver is split into two parts:
</p>
<ol>
<li>
An &quot;upper half&quot;, generic driver that provides the comman PWM 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 PWM functionality.
</li>
</ol>
<ul>
<li>
The header file for the NuttX PWM driver reside at <code>include/nuttx/pwm.h</code>.
This header file includes both the application level interface to the PWM driver as well as the interface between the &quot;upper half&quot; and &quot;lower half&quot; drivers.
The PWM module uses a standard character driver framework.
However, since the PWM driver is a devices control interface and not a data transfer interface,
the majority of the functionality available to the application is implemented in driver ioctl calls.
</li>
<li>
The generic, &quot;upper half&quot; PWM driver resides at <code>drivers/pwm.c</code>.
</li>
<li>
Platform-specific PWM 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> analog peripheral devices.
</li>
</ul>
<h2><a name="pwrmgmt">6.4 Power Management</a></h2>
<h3><a name="pmoverview">6.4.1 Overview</a></h3>