Luke,
This guide on GRC block implementation and flowgraph modification in python may be of interest to you if you have not seen it. Your description of the logic, calibration, etc. will likely require you to dive into the Python/C++
below the surface of GRC. That is the case in my experience, however — there may be control blocks out there you can try to use.
https://wiki.gnuradio.org/index.php/Guided_Tutorial_GNU_Radio_in_Python
Best,
Grant
From: Lukas Haase <discuss-gnuradio-bounces+grant.cox=address@hidden> on behalf of Lukas Haase <address@hidden>
Sent: Wednesday, November 27, 2019 15:14
To: address@hidden
Subject: Proper way to implement flowgraph programming
Hello,
I have a conceptual question which has not reasonably well answered by studying the tutorials. I work with GRC for some time now but I find it impossible to implement simple things that require basic control logic. Clearly these things are trivial to implement
with a prcedual language (MATLAB). While I am not a friend of LabView, it still supports these things with Loop elements, push buttons etc.
Examples:
1.) Frequency hopping with USRP: I want to receive a signal, do some processing and extract the phase angle from the I/Q samples. This should happen at multiple (say, 10) different carrier frequencies. The resulting 10 phase angles should be combined to form
another signal (possibly packetized) for further processing. What is the proper way to implement this "loop"?
2.) Calibrations: Things like phase rotation etc should be obtained, stored in a variable and re-used when my GRC program runs in non-calibration mode. In my example above, I would like to obtain the phases from the ten carriers at startup. When the program
runs in normal mode, these phases should be subtracted (to calibrate constant phase shift due to RX/TX/cables etc)
What is the proper way to achieve this?
Thanks,
Luke