Yan, check the PMT manuals. cons() takes 2 PMTs as input.
Cheers, Martin On 03/14/2016 09:09 AM, Yan Huang wrote: > Hi all, > > > > I want to change the frequency in “USRP source” automatically, for > example 2.37GHz-2.43GHz with each time stepping 2MHz. > > > > 1. As you know, the USRP source has an input message port, so I want to > connect it to a “Message strobe” to control the frequency change. But > after I see [1][2], I write PMT type commands in “Message PMT” in > “Message Strobe” as: > > pmt::cons(“freq”,2.4e9) > > it comes up error “invalid syntax(<string>,line 1)”, so I don’t know how > to further stepping the frequency. > > 2. If I use the “Message Strobe” to define frequency, what can I put in > the “frequency” in “USRP source” block? Put it as 0? > > > > [1] https://gnuradio.org/doc/doxygen/page_uhd.html#uhd_command_syntax > > [2] > https://gnuradio.org/doc/doxygen/page_msg_passing.html#msg_passing_commands > > > > Many thanks , > > > > Yan > > > > > > This message and any attachment are intended solely for the addressee > and may contain confidential information. If you have received this > message in error, please send it back to me, and immediately delete it. > > Please do not use, copy or disclose the information contained in this > message or in any attachment. Any views or opinions expressed by the > author of this email do not necessarily reflect the views of the > University of Nottingham. > > This message has been checked for viruses but the contents of an > attachment may still contain software viruses which could damage your > computer system, you are advised to perform your own checks. Email > communications with the University of Nottingham may be monitored as > permitted by UK legislation. > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
