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'.
A new widget will appear with controls relevant to that pin.
Make sure to check the error log to see if something goes wrong.
To see the pin out diagram of the BBB, click here.
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.
You won't be able to change the frequency until you unexport one of them.
The BBB has up to 8 PWM channels, with 6 having enhanced resolution.
However, those 6 are paired, meaning that each pair must share the same frequency (although the duty cycle can be different).
GPIO | PWM |