FYI, there's a copy of the FX2 technical ref manual here:
http://comsec.com/usrp/FX2_TechRefManual.pdf
(There may be a later version somewhere else)

Thanks

> Big question: does it have anything to do with GNUradio?

You could integrate this gadget with GNU Radio.
Note that it's really just a tuner with an a single-ended IF output
at 12 kHz.   You have to plug it into a sound card to convert the
analog IF into samples.

From the block diagram, it appears that the USB (used in 12mbit/sec
mode) is used only to control the filters, DDS, etc.

Indeed. Since the USB it's used only for tuning, it should not require
a huge amount of work (I hope...).
My problem is that I completely miss the low level USB programming
skills and I hoped to find some sort of driver for the cypress chip in
Linux, in order to focus only on the protocol about frequence and
filter (which I might get from the manufacturer).

How big is the difference between USB and serial programming?

I've discovered just today, about GNUradio. I knew there was already
some sort of framework for radios in V4L-DVB (www.linuxtv.org). I'll
have a look at both to find some help for my problem.

Thanks


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