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- <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>
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- <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>
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- <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>
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- <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>
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