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<title>Atmel Corporation - Basic RTT 1.4</title>
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<h1>Basic RTT Project 1.4</h1>
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RTT
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<h2>Purpose</h2>
<p>
This example demonstrates the Real-Time Timer (RTT) provided on AT91 microcontrollers. It enables
the user to set an alarm and watch it being triggered when the timer reaches the corresponding value.
</p>
<div class="requirements">
<h2>Hardware Requirements</h2>
<p>
This package can be used with any of the AT91 Evaluation Kits except the AT91SAM7L-EK and AT91SAM7L-STK.
</p>
</div>
<h2>Description</h2>
<p>
When launched, this program displays a timer count and a menu on the DBGU, enabling the user
to choose between several options:
<ul>
<li>Reset the timer</li>
<li>Set an alarm time</li>
<li>Clear an alarm notification if one is being displayed</li>
</ul>
</p>
<p>
The user can set an alarm time by selecting option 2 ('s'), entering the alarm time and pressing
the enter key. Once the alarm is set, a message will be displayed when the corresponding time is reached.
</p>
<h2>Usage</h2>
<ol>
<li>
Build and download the program inside the evaluation board. Please refer
to the <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6132.pdf">SAM-BA User Guide</a>,
the <a href="http://www.atmel.com/dyn/resources/prod_documents/doc6310.pdf">GNU-Based Software Development</a>
application note or to the <a href="http://www.iar.se/website1/1.0.1.0/78/1/index.php?">IAR EWARM User Guide</a>,
depending on your chosen solution.
</li>
<li>
On the computer, open the DBGU port with a terminal application
(e.g. HyperTerminal on Microsoft Windows).
</li>
<ul>
<li>Settings: 115200 bauds, 8 bits, 1 stop bit, no parity, no flow control.</li>
</ul>
<li>
Start the application.
</li>
<li>
The application menu should appear as shown below:
<blockquote>
<code>
-- Basic RTT Project 1.4 --<br />
Time: 0<br />
Menu:<br />
r - Reset timer<br />
s - Set alarm<br />
<br />
Choice?<br />
</code>
</blockquote>
The user can then choose any of the available options to perform the described
action.
</li>
</ol>
<h6>Atmel Corporation ©2008</h6>
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