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Fix banding on the R61580 LCD

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4136 42af7a65-404d-4744-a932-0658087f49c3
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patacongo 2011-12-05 19:59:10 +00:00
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Documentation/NuttxUserGuide.html
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@ -13,7 +13,7 @@
<h1><big><font color="#3c34ec"><i>NuttX Operating System<p>User's Manual</i></font></big></h1> <h1><big><font color="#3c34ec"><i>NuttX Operating System<p>User's Manual</i></font></big></h1>
<p><small>by</small></p> <p><small>by</small></p>
<p>Gregory Nutt<p> <p>Gregory Nutt<p>
<p>Last Updated: July 19, 2011</p> <p>Last Updated: December 5, 2011</p>
</td> </td>
</tr> </tr>
</table> </table>
@ -1549,58 +1549,83 @@ interface of the same name.
<h3><a name="mqnotify">2.4.7 mq_notify</a></h3> <h3><a name="mqnotify">2.4.7 mq_notify</a></h3>
<p> <p>
<b>Function Prototype:</b> <b>Function Prototype:</b>
<pre> <pre>
#include &lt;mqueue.h&gt; #include &lt;mqueue.h&gt;
int mq_notify(mqd_t mqdes, const struct sigevent *notification); int mq_notify(mqd_t mqdes, const struct sigevent *notification);
</pre> </pre>
</p>
<p> <p>
<b>Description:</b> If the &quot;notification&quot; input parameter <b>Description:</b> If the <code>notification</code> input parameter
is not NULL, this function connects the task with the message queue such is not <code>NULL</code>, this function connects the task with the message queue such
that the specified signal will be sent to the task whenever the message that the specified signal will be sent to the task whenever the message
changes from empty to non-empty. One notification can be attached changes from empty to non-empty. One notification can be attached
to a message queue. to a message queue.
</p>
<p> <p>
If &quot;notification&quot; is NULL, the attached notification If <code>notification</code>; is <code>NULL</code>, the attached notification
is detached (if it was held by the calling task) and the queue is detached (if it was held by the calling task) and the queue
is available to attach another notification. is available to attach another notification.
</p>
<p> <p>
When the notification is sent to the registered task, its registration When the notification is sent to the registered task, its registration
will be removed. The message queue will then be available for will be removed. The message queue will then be available for
registration. registration.
<p> <p>
<b>Input Parameters:</b> <b>Input Parameters:</b>
<ul> <ul>
<li><i>mqdes</i>. Message queue descriptor <li>
<li><i>notification</i>. Real-time signal structure containing: <code>mqdes</code>. Message queue descriptor
<ul> </li>
<li><i>sigev_notify</i>. Should be SIGEV_SIGNAL (but actually <li><code>notification</code>. Real-time signal structure containing:
ignored) <ul>
<li><i>sigev_signo</i>. The signo to use for the notification <li><code>sigev_notify</code>. Should be SIGEV_SIGNAL (but actually ignored)
<li><i>sigev_value</i>. Value associated with the signal <li><code>sigev_signo</code>. The signo to use for the notification
</ul> <li><code>sigev_value</code>. Value associated with the signal
</ul>
</ul> </ul>
</p>
<p> <p>
<b>Returned Values:</b> None. <b>Returned Values:</b>
On success <code>mq_notify()</code> returns 0; on error, -1 is returned, with
<code>errno</code> set to indicate the error:
<ul>
<li>
<code>EBADF</code>. The descriptor specified in <code>mqdes</code> is invalid.
</li>
<li>
<code>EBUSY</code>. Another process has already registered to receive notification
for this message queue.
</li>
<li>
<code>EINVAL</code>. <code>sevp->sigev_notify</code> is not one of the permitted values; or
<code>sevp->sigev_notify</code> is <code>SIGEV_SIGNAL</code> and <code>sevp->sigev_signo</code> is not a
valid signal number.
</li>
<li>
<code>ENOMEM</code>. Insufficient memory.
</li>
</ul>
</p>
<p> <p>
<b>Assumptions/Limitations:</b> <b>Assumptions/Limitations:</b>
</p>
<p> <p>
<b> POSIX Compatibility:</b> Comparable to the POSIX interface <b>POSIX Compatibility:</b> Comparable to the POSIX interface of the same name.
of the same name. Differences from the full POSIX implementation include:
Differences from the full POSIX implementation include: <ul>
<ul> <li>
<li>The notification signal will be sent to the registered task even if The notification signal will be sent to the registered task even if
another task is waiting for the message queue to become non-empty. This is another task is waiting for the message queue to become non-empty. This is
inconsistent with the POSIX specification which states, &quot;If a process inconsistent with the POSIX specification which states, &quot;If a process
has registered for notification of message arrival at a message queue and has registered for notification of message arrival at a message queue and
some process is blocked in <i>mq_receive</i> waiting to receive a message some process is blocked in <i>mq_receive</i> waiting to receive a message
when a message arrives at the queue, the arriving message shall satisfy the when a message arrives at the queue, the arriving message shall satisfy the
appropriate <i>mq_receive()</i> ... The resulting behavior is as if the appropriate <i>mq_receive()</i> ... The resulting behavior is as if the
message queue remains empty, and no notification shall be sent.&quot; message queue remains empty, and no notification shall be sent.&quot;
</ul> </li>
</ul>
</p>
<H3><a name="mqsetattr">2.4.8 mq_setattr</a></H3> <H3><a name="mqsetattr">2.4.8 mq_setattr</a></H3>