- <div class="widget">
- <div class="title">Unexport?</div>
- <p>
- To 'unexport' a pin means to disable it. Apart from the obvious
- use case, sometimes this can be required if you use two PWM channels
- that share the same frequency base.
- </p>
- <p>
- You won't be able to change
- the frequency until you unexport one of them.
- </p>
+ </noscript>
+
+ <div id="content">
+ <div id="sidebar">
+ <div class="widget">
+ <div class="title">Navigation menu</div>
+ <div class="nav-menu">
+ <ul>
+ <li><a href="index.html"><span>Home</span></a></li>
+ <li><a href="control.html"><span>Experiment control</span></a></li>
+ <li><a href="pintest.html"><span>Pin debugging</span></a></li>
+ <li class="last"><a href="#"><span>Help</span></a></li>
+ </ul>
+ </div>
+ </div>
+ <div class="widget">
+ <div class="title">Info</div>
+ <p>This test page gives control over the BBB's pins.
+ Select a pin that you wish to use from the relevant drop-down
+ menu and click 'Go'.</p>
+ <p>A new widget will appear with controls relevant to that pin.</p>
+ <p>Make sure to check the error log to see if something goes wrong.</p>
+ </div>
+ <div class="widget">
+ <div class="title">Pin out diagram</div>
+ <p>To see the pin out diagram of the BBB, click <a href="pinout-table.pdf" target="_blank">here</a>.</p>
+ </div>
+ <div class="widget">
+ <div class="title">Export/Unexport?</div>
+ <p>
+ To export/unexport a pin means to enable/disable it. Apart from the obvious
+ use case, sometimes this can be required if you use two PWM channels
+ that share the same frequency base.
+ </p>
+ <p>
+ You won't be able to change
+ the frequency until you unexport one of them.
+ </p>
+ </div>
+ <div class="widget">
+ <div class="title">PWM explained</div>
+ <p>The frequency must be a decimal number greater than 0.</p>
+ <p>
+ The duty cycle describes the proportion of off/on time per period.
+ This number is specified as a ratio, with values ranging from 0 to 1.
+ </p>
+ <p>
+ The polarity determines if the duty represents the 'active
+ high' or 'active low' portion. By default, the duty cycle
+ represents the 'active high' portion.
+ </p>
+ </div>