Additional pps-gpio

[Hal Murray]

> I've just tried that again with both the uBlox-6 and uBlox-8 and while I can
> attach the PPS line discipline to the interface, no PPS ever gets generated
> on that device.  If they can actually do that, I'd be interested in how to
> enable that capability.

You can build your own with PPS by adding a few wires to the combination of a 
GPS breakout board and a USB-serial with breakout on the serial side.  There 
is at least one USB-serial chip available on a breakout that polls at 1/4 ms. 
 I'll look up part numbers that I'm using if anybody is interested.


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