On 2022-09-30 13:52, Avila, Jose A wrote:
Hey Marcus,
I checked and the cal files are in the correct location. I was using a
gain of 10, but even at 0 I can start to see the lo peak out of the
noise floor. In rfnoc:radio_control I did see a set_tx_dc_offset() but
Im not sure how to read the cal file to get the value manually or how
to pass it the file.
UHD knows where those files are located. If it was the same UHD
library that *generated* them, it knows where they are.
Information on config file management is here:
https://files.ettus.com/manual/page_configfiles.html
I am now trying to find a way to offset tune the lo but can't figure
out how to do that with rfnoc. I tried uhd::rfnoc::radio_control
set_tx_freq with a tune_request_t but that didn't work, my guess is
that is for the multiusrp and not rfnoc radio control. I saw there was
a set_tx_lo_freq but it expects 3 arguments one being name of lo stage
which I haven't been able to decipher. So far I have only found
examples without rfnoc using usrp::multiusrp.
Hmm, I think tune_request_t will work with an RFNoC set_tx_freq, but as
I'm not an RFNOC programmer, I'm not sure.
You're probably best to pursue the offset-tuning approach--there's no
way to make a mixer have *zero* LO leakage. In radios
that aren't direct-conversion, this isn't a problem, since the LO is
usually far enough away from the carrier that it can be
easily filtered out in analog filters before the 1st RF amplifier.
In a general-purpose, DC-light-tunable transceiver with
direct conversion, this isn't always possible.
------------------------------------------------------------------------
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*Subject:* USRP-users Digest, Vol 145, Issue 60
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Today's Topics:
1. Re: USRP-users Digest, Vol 145, Issue 55 (Marcus D. Leech)
2. Re: Reset Timing Violation (Brian Padalino)
3. Re: Reset Timing Violation (Wade Fife)
----------------------------------------------------------------------
Message: 1
Date: Tue, 27 Sep 2022 09:44:08 -0400
From: "Marcus D. Leech" <patchvonbr...@gmail.com>
Subject: [USRP-users] Re: USRP-users Digest, Vol 145, Issue 55
To: usrp-users@lists.ettus.com
Message-ID: <e32a7073-710a-1279-fbe9-ce50f3a80...@gmail.com>
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On 2022-09-27 09:01, Avila, Jose A wrote:
> Using the UBX board on the x310 and the lo leakage is the same
> amplitude if not higher than the signal being played with rfnoc
> samples from file.
>
Can you confirm that it placed .cal files in the appropriate directory:
https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffiles.ettus.com%2Fmanual%2Fpage_calibration.html%23calibration_data&data=05%7C01%7Cjaavila5%40miners.utep.edu%7C831033990cc2406a426608daa0f7ee6f%7C857c21d21a1643a490cfd57f3fab9d2f%7C1%7C0%7C637999283960023866%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2uxlWwt7G3rjdaWH0ZK5fbvneyRBlOyodbnar7rn7Tk%3D&reserved=0
<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffiles.ettus.com%2Fmanual%2Fpage_calibration.html%23calibration_data&data=05%7C01%7Cjaavila5%40miners.utep.edu%7C831033990cc2406a426608daa0f7ee6f%7C857c21d21a1643a490cfd57f3fab9d2f%7C1%7C0%7C637999283960023866%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2uxlWwt7G3rjdaWH0ZK5fbvneyRBlOyodbnar7rn7Tk%3D&reserved=0>
What gain setting are you using when transmitting?
>
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> 2. Re: X310 calibration (Marcus D. Leech)
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>
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>
> Message: 1
> Date: Fri, 23 Sep 2022 17:36:37 +0000
> From: "Avila, Jose A" <jaavi...@miners.utep.edu>
> Subject: [USRP-users] X310 calibration
> To: "usrp-users@lists.ettus.com" <usrp-users@lists.ettus.com>
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>
> I have noticeable lo leakage when running the cpp rfnoc replay samples
> from file. So I ran the calibration functions but it doesn't seem to
> be using the created files since I did not notice a difference. Is
> there a function call or setting in cpp I need to add? I thought it
> would be automatic. Using uhd 4.2 with X310.
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>
> Message: 2
> Date: Fri, 23 Sep 2022 14:16:48 -0400
> From: "Marcus D. Leech" <patchvonbr...@gmail.com>
> Subject: [USRP-users] Re: X310 calibration
> To: usrp-users@lists.ettus.com
> Message-ID: <fc5fc6fa-d33f-9958-7e58-2fe637175...@gmail.com>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 2022-09-23 13:36, Avila, Jose A wrote:
> > I have noticeable lo leakage when running the cpp rfnoc replay samples
> > from file. So I ran the calibration functions but it doesn't seem to
> > be using the created files since I did not notice a difference. Is
> > there a function call or setting in cpp I need to add? I thought it
> > would be automatic. Using uhd 4.2 with X310.
> >
> Which daughtercards are you using?
>
> I'll note that most of the DC-offset compensation is done in a
> daughtercard-independent way and doesn't rely on the
> CAL functions as far as I know--there's a continuous "DC offset
> removal" function in the FPGA.
>
> When you say "noticeable" what is the magnitude we're talking about?
>
>
>
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Message: 2
Date: Tue, 27 Sep 2022 10:08:48 -0400
From: Brian Padalino <bpadal...@gmail.com>
Subject: [USRP-users] Re: Reset Timing Violation
To: adri96r...@gmail.com
Cc: "USRP-users@lists.ettus.com" <usrp-users@lists.ettus.com>
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On Tue, Sep 27, 2022 at 7:21 AM <adri96r...@gmail.com> wrote:
> Hi every one!
>
>
> I am facing some problems with reset timing violations. This is is
one for
> example, and i have a fews. I tried to instantiate the reset signal
but it
> didn work. I don know how to fix it. On the other side, i have seen
a reset
> generation in a noc shell and i was wondering if i have to generate
a new
> one from a previous one.
>
I can't see much other than the names of the signals and the negative
slack, but the hierarchy seems to indicate it's part of a synchronizer
that's been double flopped, so maybe there should be a false path
associated with it in your constraints?
Brian
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Message: 3
Date: Tue, 27 Sep 2022 21:19:19 -0500
From: Wade Fife <wade.f...@ettus.com>
Subject: [USRP-users] Re: Reset Timing Violation
To: Brian Padalino <bpadal...@gmail.com>
Cc: adri96r...@gmail.com, "USRP-users@lists.ettus.com"
<usrp-users@lists.ettus.com>
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There's not enough information in the screen shot, but I think the output
of the double synchronizer is on a different clock domain than flop flop
(dato_entrada) being reset by it.
The reset signal needs to be driven by the same clock as the flip flop
being reset, otherwise Vivado can't ensure that the requirements of the FF
will be met, resulting in this timing violation.
Make sure you're using the right clock and reset signal for your
dato_entrada register.
Wade
On Tue, Sep 27, 2022 at 9:10 AM Brian Padalino <bpadal...@gmail.com>
wrote:
> On Tue, Sep 27, 2022 at 7:21 AM <adri96r...@gmail.com> wrote:
>
>> Hi every one!
>>
>>
>> I am facing some problems with reset timing violations. This is is one
>> for example, and i have a fews. I tried to instantiate the reset
signal but
>> it didn work. I don know how to fix it. On the other side, i have
seen a
>> reset generation in a noc shell and i was wondering if i have to
generate a
>> new one from a previous one.
>>
> I can't see much other than the names of the signals and the negative
> slack, but the hierarchy seems to indicate it's part of a synchronizer
> that's been double flopped, so maybe there should be a false path
> associated with it in your constraints?
>
> Brian
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