Re: GR and PPS

[isaac mario tupac davila]

Hi Richard

Thanks for the help. I didn't know that tool was available for GR. I'm considering update to GR 3.9 as it is available for that version.

I was thinking in aggregate the method set_time_next_pps() inside the code of the UHD:USRP block and then re-make GR. I've never tried to edit the python build file before and I didn't know I could do it with hand-editing or with snippets.

I thought the py build file of my flowgraph was uneditable as it is generated by its own.

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Thanks

Regards

Isaac T.

El mié, 24 nov 2021 a las 13:06, Richard Stanley (<richardlstanley@gmail.com>) escribió:

Hi Isaac,

I'm in the middle of 'day job' but here's a way to try to get 1PPS going in GR without hand-editing the Py build.

You can use a Python snippet if using a recent GR version (3.9 for sure, don’t know about 3.8). Create a Python snippet block using the default settings (Main - After Init), then add the following, changing the ID of your USRP (show parameters to see it in GRC) as required but mine is uhd_usrp_source_0:

<snippet>
time_last_pps = self.uhd_usrp_source_0.get_time_last_pps()
while(self.uhd_usrp_source_0.get_time_last_pps() == time_last_pps):
    time.sleep(0.01)

self.uhd_usrp_source_0.set_time_next_pps(uhd.time_spec(0.0))
time.sleep(1.0)

self.uhd_usrp_source_0.set_start_time(uhd.time_spec(1.0))
</snippet>

Apologies for replying off-list. (I really need to figure out how to reply to a message from the digest of GR mailing list.)

HTH,
Richard