Hi Jaeho,
there's three blocks that use the "freq" variable from that WX GUI slider:
* the USRP source
* the USRP sink
* the FFT sink
The first two have an input message port; you can connect a
message-emitting block to these, and send PMTs containing commands to
these [1]. The WX FFT sink doesn't have such an input port, but frankly,
that doesn't matter, because it only needs the center frequency to
display it [2]
To test your case, try a "Message strobe" block, with the message set to
something like
pmt.pmt_to_python.python_to_pmt({"freq":2.4e9})
Obviously, that will just periodically set the /same/ frequency (2.4GHz)
over and over again. However, as soon as you have verified that works,
you can just write your own (python or C++) block that has no stream in-
or outputs, but spawns a new thread that periodically sends a message
out; see [1] for the syntax you'd need to use to add exact timing to the
command dictionaries.
Best regards,
Marcus
[1] https://gnuradio.org/doc/doxygen/page_uhd.html#uhd_command_syntax
[2] if that bothers you, replace all the WX things in your flow graph by
Qt elements; you can enable message ports on these
On 21.09.2015 08:11, Jaeho wrote:
> Hello. I am using Ubuntu 15.04 now.
> I have a question about transceiver_OQPSK.py source code.
> I success to run this source code on USRP X300.
> The thing that i want to do next is changing frequency
> automatically(randomly).
> Originally, this code choose frequency using radio button GUI to change
> frequency.
> But, i hope to change frequency automatically without any GUI working.
> For example, if I run this code, then frequency is changed periodically and
> have random value.
>
> Which block should I use to change value automatically in GRC
> or how can i modify in python code.
>
> Please give me advice.
> Thank you
>
>
>
> --
> View this message in context:
> http://gnuradio.4.n7.nabble.com/change-frequency-in-gr-ieee802-15-4-example-transceiver-OQPSK-py-tp56164.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
>
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