Maria,
I might not be the right person to answer this, as my experience with
UHD 4.0 is relatively limited at the moment.
However, I cant tell you that the AGC on B2x0 devices is controlled via
software (using set_rx_agc()). There is no need to directly modify the
state of any pins of the FPGA.
I vaguely remember that there was a bug in an earlier version of gr-uhd
(somewhere in 3.7) that made it difficult to turn on the AGC using GRC.
That particular one is fixed in gr-uhd. Not sure about gr-ettus, though.
Maybe try using set_rx_agc() manually in you flow-graph (*.py) and see
if that helps.
Cheers,
Julian
On 3/9/21 5:11 PM, Maria Muñoz via USRP-users wrote:
Hi all,
I was wondering if it is possible to enable AGC from the RFNoC radio
block in GNURadio. I use UHD 4.0 version and GNURadio 3.8 with gr-ettus.
I see that the RFNoC Rx radio block has an enable/disable/default AGC
option in the GNURadio block which I assume calls the UHD function
"set_rx_agc"
(https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#abdab1f6c3775a9071b15c9805f866486)
I have also checked on the FPGA side that there is a pin from FPGA to
AD9361 called XCVR_ENA_AGC which is set always to 1 on the top level of
the FPGA image (see attached file "e320.v", line 872). This pin,
according to
https://www.analog.com/media/en/technical-documentation/data-sheets/AD9361.pdf
is the "Manual Control Input for Automatic Gain Control (AGC)".
Must be this pin set to 0 to have AGC working?
If not, how can I get AGC working? I've made some tests
enabling/disabling this option but I do not see any changes between the
waveforms received.
Any help would be appreciated.
Kind Regards,
Maria
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