On 07/23/2020 06:13 AM, Marcus Müller via USRP-users wrote:
I also just realized that you can be reaaaally silly. If you have a
transistor and two resistors to spare, use the GPIO front panel
connector to generate a faux-PPS pulse, buffer it using the transistor,
and feed it back to the backpanel PPS input... might save you the extra
device, but of course the RPi solution is still elegant, as it allows
for not-quite-but-at-least-close-ish NTP synchronicity.
Cheers,
Marcus
You don't need any external hardware at all.
B2xx, X3xx, N3xx all have a synthetic internal 1PPS if there is no other
source.
The code generated by GRC for the "unknown PPS case" needs to be
post-facto modified so that instead of setting a 0, it sets it to system
time (or whatever you desire). This is simple to do. It really
would be nice if gr-uhd had an option to do this instead of setting to
0, but
it doesn't.
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