[Patch-gnuradio] FPGA clock frequency option for usrp_fft.py

[Alexander Chemeris]

Hi,

This patch does a simple thing - adds an '-F' option to usrp_fft.py
to set FPGA frequency. Without this I can't use this script when
USRP reference frequency is different from default.

I changed only a single script as a proof of concept. If we agree on
the option name and description, I can gradually change other
common scripts.

-- 
Regards,
Alexander Chemeris.

usrp_fft-set-fpga-freq.diff
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