Hi,
I want to sync two USRP2s, and currently trying to modify the VRT
rx_timed_samples...
usrp2::clock_config_t cc;
cc.ref_source = usrp2::clock_config_t::REF_INT;
cc.pps_polarity = usrp2::clock_config_t::PPS_NEG;
cc.pps_source = usrp2::clock_config_t::PPS_SMA;
cc.provide_ref_to_mimo = false;
u2->config_clock(cc);
// u2->set_time(....); // replaced with...
u2->set_time_at_next_pps(...);
However, the code hangs at the start sampling, and manually applying a
pulse to the PPS SMA does nothing.
What is the correct voltage level and pulse shape required? Manually
toggling anything between 0-1.5v and 0-5v does nothing. I hope 5V isn't
too much!!!
Ultimately, I want to capture coherent samples with both USRPs, maybe
with the MIMO cable, and a GPS reference + PPS. Would this be just a
case of...
For USRP A (with ref + PPS attached)...
cc.ref_source = usrp2::clock_config_t::REF_EXT;
cc.pps_polarity = usrp2::clock_config_t::PPS_NEG;
cc.pps_source = usrp2::clock_config_t::PPS_SMA;
cc.provide_ref_to_mimo = true;
For USRP B...
cc.ref_source = usrp2::clock_config_t::REF_EXT; ***MIMO???***
cc.pps_polarity = usrp2::clock_config_t::PPS_NEG;
cc.pps_source = usrp2::clock_config_t::PPS_SMA; ***MIMO???***
cc.provide_ref_to_mimo = false;
Kind Regards,
David
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