Hi, Nikos,
Thanks for your reply! I will try to learn and install ctag. Here is what I
further find:
Following your directions, I can find the _tx_freq variable in
"uhd/host/lib/usrp/common/ad9361_driver/ad9361_device.h".
I assume that the " _tune_helper() " function implemented in
"uhd/host/lib/usrp/common/ad9361_driver/ad9361_device.cpp" is the
underlying function that tunes the ad9361 front end.
The problem is that I modify the _tune_helper() by throwing a uhd error at
the beginning of the function, however after I re-compile the modified uhd
and re-install it and then re-run my tuning loop, I didn't find the error
message I throw in the _tune_helper() .
Does that mean the E312 uhd does not run the _tune_helper() function in
"uhd/host/lib/usrp/common/ad9361_driver/ad9361_device.cpp"?
I really would like to find where the underlying tuning source code is and
I need to turn off the calibration procedure in the tuning code to speed up
the tuning.
Thanks,
Yan
On Thu, Jul 28, 2022 at 6:48 PM Nikos Balkanas <nbalka...@gmail.com> wrote:
> Hi,
>
> _tx_freq is an intermediate frequency.
> It is defined in:
> uhd/host/lib/usrp/common/ad9361_driver/ad9361_device.h
> If you need to modify uhd, you really need to install ctags, and grep
> the sources...
>
> HTH
> Nikos
>
> On Thu, Jul 28, 2022 at 10:42 PM <yanzhan...@gmail.com> wrote:
> >
> > Hi, all,
> >
> >
> >
> > I have a E312 device and I just find that the tuning speed of E312 is
> very slow (~150ms) for each tuning. Thus I would like to modify the
> underlying tuning source code in the uhd software architecture.
> >
> >
> >
> > Here is what I found:
> >
> >
> >
> > I first create a multi_usrp object:
> >
> > uhd::usrp::multi_usrp::sptr usrp =
> uhd::usrp::multi_usrp::make(device_args);
> >
> >
> >
> >
> >
> > then I tune the usrp by running a loop:
> >
> >
> >
> > int count = 200;
> > for(int a = 0; a < count; a++) {
> > uhd::tune_request_t tune_request(600e6 + a*10e6);
> >
> > usrp->set_rx_freq(tune_request, 0);
> > usrp->set_tx_freq(tune_request, 0);
> > }
> >
> >
> >
> > Basically, the loop tunes the frequency from 600MHz to 2.6 GHz with a
> step size of 10 MHz. The 200 tunings take 52 seconds, which is pretty slow.
> >
> >
> >
> > Thus, I traced the call stack from usrp->set_rx_freq(tune_request, 0).
> Here is what I found:
> >
> > usrp->set_rx_freq(tune_request, 0); calls the method set_tx_frequency()
> in uhd/host/lib/usrp/dboard/e3xx/e3xx_radio_control_impl.cpp
> >
> > then the method set_tx_frequency() in
> uhd/host/lib/usrp/dboard/e3xx/e3xx_radio_control_impl.cpp calls the tune()
> method in uhd/host/lib/usrp/dboard/e3xx/e3xx_ad9361_iface.cpp
> >
> > then the tune() method in
> uhd/host/lib/usrp/dboard/e3xx/e3xx_ad9361_iface.cpp calls the method
> set_tx_frequency() in uhd/host/lib/rfnoc/radio_control_impl.cpp.
> >
> >
> >
> > The conclusion I have reached so far is the underlying tuning method is
> in uhd/host/lib/rfnoc/radio_control_impl.cpp:
> >
> >
> >
> > double radio_control_impl::set_tx_frequency(const double freq, const
> size_t chan)
> > {
> > std::lock_guard<std::mutex> l(_cache_mutex);
> > return _tx_freq[chan] = freq;
> > }
> >
> >
> >
> > Then I just got stuck here, what is the _tx_freq[chan] ? I just can not
> find more.
> >
> >
> >
> >
> >
> > What I want to do is to modify the underlying ad9361 driver, so that
> when tuning a frequency, I can bypass the calibration in the ad9361 to
> speed up the tuning speed.
> >
> >
> >
> > Can anyone point me to 1.where I can find the source code for tuning for
> the E312 with uhd 4.0 or 2. how to use mpm to get low-level access to
> ad9361 so that I can write my own tuning method for ad9361 ?
> >
> >
> >
> > Thanks,
> >
> > Yan
> >
> > _______________________________________________
> > USRP-users mailing list -- usrp-users@lists.ettus.com
> > To unsubscribe send an email to usrp-users-le...@lists.ettus.com
>
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