On 03/20/2018 03:27 PM, Firdavs Pulat wrote:
Hi Marcus,
Could you please elaborate on the "extend the Gnu Radio multi_usrp"
part? Maybe you could point me to some examples one how to set these
(I assume others must have played around with them since it's so
essential), or documentation on how that's done? I'm just not sure
where/how in the usrp_source impl source code I would set them. I have
been looking online, but haven't found anything of use yet.
Thank you!
In the Gnu Radio source code, in gr_uhd/usrp_source_impl.cc
If you look at any of the setter functions for various device
parameters, you'd pattern your call to set_rx_agc() after one of those.
The lowest-impact
way to do it would be to "hijack" the existing gain-setting function,
and have it look for "magic" gain value that then turns on hardware AGC
via the set_rx_agc() function.
In reality, very few applications use the hardware AGC in the chip,
which is one of the reasons that it hasn't yet been "mapped" into the GR
API wrapper.
On Thu, Mar 8, 2018 at 10:58 AM, Marcus D. Leech <mle...@ripnet.com
<mailto:mle...@ripnet.com>> wrote:
On 03/08/2018 10:43 AM, Firdavs Pulat wrote:
Hi all,
Are there APIs as part of gnuradio that give access to the low
level ADI registers (to both probe, and set)? For instance,
I'm trying to see if the AGC is currently turned on on
B200mini, and if it's, what kind of mode it is on (e.g., slow
or fast). Looking at it the USRP manual online, I see
functions like set_agc, set_agc_mode, etc. I just don't have
any idea how/where to actually use/set these. Could anyone
please help me out?
Thanks!
No need to tinker with ADI registers.
The multi_usrp API provides access to a set_rx_agc function:
https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#abdab1f6c3775a9071b15c9805f866486
<https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#abdab1f6c3775a9071b15c9805f866486>
However, you'd have to extend the Gnu Radio multi_usrp "wrapper"
(in gr-uhd in the main Gnu Radio codebase) to provide access to
set_rx_agc().
Note that in many cases, hardware AGC doesn't really work the way
you'd like it to, since its "world view" may be very very
different than the view
of your particular application.
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