Hi David, Ok, thanks. I was just going by https://files.ettus.com/manual/page_general.html "Automatic master-clock selection" which said it does. I'll add some code that assumes it is manual only, unless the /mboards/0/auto_tick_rate property exists.
Cheers, Jon -----Original Message----- From: David Raeman <da...@synopticengineering.com> Sent: 07 June 2022 00:57 To: Jon Beniston <j...@beniston.com>; 'Marcus D. Leech' <patchvonbr...@gmail.com>; usrp-users@lists.ettus.com Subject: [USRP-users] Re: E320 Automatic master clock Hi Jon, I did some poking around in the code, and I don't believe the E320 supports that feature. On B2xx radios, if you don't specify an explicit master clock rate it has logic to determine an ideal rate based on the sampling rate, and it exposes an auto_tick_rate property to toggle that behavior from the application. Conversely, on the E320 radio if you don't specify an explicit master clock rate it always uses a fixed value of 16 MHz, and the implementation has no logic that I see to perform the dynamic tick rate calculations. Since the B2xx and E320 radios are both based on the AD9361 RFIC, theoretically I think the logic could be placed somewhere such that the E320 and B2xx radios could both provide the feature. However, the implementations are pretty diverged - the E320 is based on the newer MPM code architecture and the B2xx is not. Short story is the E320 doesn't seem to support this, but I think it's just a matter of missing bits in the software. Best, -David > -----Original Message----- > From: Jon Beniston <j...@beniston.com> > Sent: Monday, June 6, 2022 6:46 PM > To: 'Marcus D. Leech' <patchvonbr...@gmail.com>; usrp- > us...@lists.ettus.com > Subject: [USRP-users] Re: E320 Automatic master clock > > Hi Marcus, > > >> If I just try to re-make the device, I get an exception. Eg: > >> > > > m_dev = uhd::usrp::multi_usrp::make(device_args); > > > m_dev->set_master_clock_rate(61.44e6); > > > // How to restart a session here? > >> m_dev = uhd::usrp::multi_usrp::make(device_args); > >> > >> ... > > >However, there is a set_master_clock_rate() API call: > > > >https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#a > 99 > >254abfa5259b70a020e667eee619b9 > > Yes, that's what I'm calling above. > > >What the consequences are for changing this within a session > > is necessarily device dependent. If I were going to do this, I'd tear down > the streamers, set the > > master_clock to the new rate, and then re-create the streamers. > > The problem is, that method doesn't appear to support an "automatic" > rate, unless I'm missing something. > > Thanks, > Jon > > > > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe > send an email to usrp-users-le...@lists.ettus.com _______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com _______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com To unsubscribe send an email to usrp-users-le...@lists.ettus.com
