Thomas, To accomplish what you're talking about, I think you'd just need to use timed commands on both set_tx_rate() and set_gpio_attr(). If these are set to execute simultaneously, the GPIO line you set will go high on the same clock cycle as the LO retune.
Sam On Tue, Jan 14, 2020 at 5:59 AM Jeff S via USRP-users < usrp-users@lists.ettus.com> wrote: > Thomas, > > I am looking at GPIO right now as well. As to your question #2 on > examples, I compiled and am able to run the example I found in the UHD > software: > > uhd/host/examples/gpio.cpp > > > I am able to set individual data lines to experiment with (and eventually > use as a roadmap for my development) using commands like: > > ./gpio --dwell 0 --bitbang --ddr 0x00ff --out 0x0055 > > > which I verified works using a logic analyzer. I eventually want to try > to create a keying loop, but that may take some FPGA control (?). > > Jeff > > > ------------------------------ > *From:* USRP-users <usrp-users-boun...@lists.ettus.com> on behalf of > Thomas Harder via USRP-users <usrp-users@lists.ettus.com> > *Sent:* Tuesday, January 14, 2020 5:07 AM > *To:* usrp-users@lists.ettus.com <usrp-users@lists.ettus.com> > *Subject:* [USRP-users] using GPIO output to trigger external RF switches > > > Hi, > > I am continuously transmitting a waveform with several RF with 200MSPS > with my USRP X310 (modified code on the basis of “tx_samples_from_file.cpp” > with a waveform in a .dat file). I would like to get a trigger signal from > the USRP when it is changing the tx- frequency which I set in my .dat file. > > Could the GPIO deliver this trigger without changing the image? > > I am using the SRAM image with UHD 3.14.1 > > > > A second question is concerning the GPIO example on > https://files.ettus.com/manual/page_gpio_api.html. > > I copied and paced it in the “tx_waveforms” example just changing the usrp > device handle to “usrp” but when I compiled it and started tx, I couldn’t > measure any tension on PIN 4 and 6 as defined in the example. Are there > more examples how to program the GPIO? > > Thank you, > > Thomas > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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