Hi,
We want to use the timer as a clock source to external hardware.
The output would be a square wave at a variable frequency, and able to be 
enabled and disabled.
The output would complete the half-cycle at the old frequency, then the new 
half-cycle would be at the new frequency.
An API supporting period instead of frequency is also suitable.

An attempt to use the PWM outputs using other libraries was unsuccessful, 
in that upon change of frequency, the PWM output is often disabled, 
resulting in glitches in the clock to the external hardware.

An alternative, using an ARM micro, connected serially, and using the ARM 
micro timer output, works fine, but since the BBB has its own timers, it 
seems a waste to leave it unused.
 

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