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Today's Topics:
1. Re: TX/RX Switch on SBX Daughterboard in Full Duplex mode
(Tuerkyilmaz, Eral)
2. UHD/FPGA communication issue (Staffan Backen)
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Message: 1
Date: Tue, 18 Mar 2014 18:59:02 +0100
From: "Tuerkyilmaz, Eral" <[email protected]>
To: "[email protected]" <[email protected]>
Subject: Re: [USRP-users] TX/RX Switch on SBX Daughterboard in Full
Duplex mode
Message-ID:
<[email protected]>
Content-Type: text/plain; charset="iso-8859-1"
Yes,
Setting Line 294 from
https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/dboard/db_sbx_common.cpp#L294
to
---------------
| 0 );
---------------
did the trick. Thank you very much for the hint.
Best Regards,
Eral
Von: Ben Hilburn [mailto:[email protected]]
Gesendet: Montag, 10. M?rz 2014 23:07
An: Tuerkyilmaz, Eral
Cc: [email protected]
Betreff: Re: [USRP-users] TX/RX Switch on SBX Daughterboard in Full Duplex mode
Hi Eral -
The switching behavior is set by the driver. You can see it being set for the
WBX v4 in this part of the code:
https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/dboard/db_wbx_version4.cpp#L135
And for all versions of the SBX in this part of the code:
https://github.com/EttusResearch/uhd/blob/master/host/lib/usrp/dboard/db_sbx_common.cpp#L276
Take a look at that SBX code and let us know if it is what you are looking for!
Cheers,
Ben
On Wed, Mar 5, 2014 at 4:57 AM, Tuerkyilmaz, Eral
<[email protected]<mailto:[email protected]>> wrote:
Hello,
We will operate the USRP N210 in combination with the SBX board in a TDD mode.
For this we intend to use both RF connections (TX/RX (used for transmitting)
and RX2 (used for receiving)) and do the switching by an external circuit.
Therefore we want to provide the internal TX/RX switching signal to the
external circuit even when the antenna setting is "Full Duplex".
I observed that this is possible with the WBX board since it always switches
the signal on the pin io_tx_15 even when the receive antenna is set to "RX2"
(Full Duplex Mode).
I couldn't observe this behaviour on the SBX board. The TX/RX switch is only
switched when the antenna setting "TX/RX" is used. Is there any quick way to
change this behavior to the "WBX-style" from the UHD driver?
Thank you and the Best Regards,
Eral T?rkyilmaz
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Message: 2
Date: Tue, 18 Mar 2014 22:52:39 +0100
From: Staffan Backen <[email protected]>
To: <[email protected]>
Subject: [USRP-users] UHD/FPGA communication issue
Message-ID:
<of74e921ab.5993e6f8-onc1257c9f.006b9ee0-c1257c9f.00782...@moog.com>
Content-Type: text/plain; charset="us-ascii"
Friends -
I have an E110 that does not behave the way I expected it to.
I have put a custom module in "custom_dsp_rx.v", and the receive part
works as expected. Further, I have added signals (inside u1plus_core and
down) from the TX side over to the custom_dsp_rx module such that I
should be able to send a custom "command" using usrp_stream->send(),
process data in the fpga and return a custom "message" that is interpreted
on the host side. However, it does not behave as expected. The "tx_strobe"
inside "custom_dsp_rx" goes high when I send a command for the expected
duration (the receive path works fine, so I can for example count the
number of received strobes), but the tx_sample is always zero when strobe
is high.
Is there something I have overlooked here (like a timing issue between TX
strobe/sample), or does this this approach sound reasonable?
If you need any additional information, please let me know.
best,
Staffan
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