LookupError: KeyError: No devices found (was: Re: Discuss-gnuradio Digest, Vol 250, Issue 15)

[Marcus Müller]

Hi Sowji,

according to the text you've replied to:

> When replying, please edit your Subject
>         line so it is more specific
>         than "Re: Contents of Discuss-gnuradio digest..."

I changed the subject line to actually describe the contents of your email. Please get in the habit of doing that :)

Anyways, as you notice, this is an error related to UHD not finding any USRP devices. Since we don't know which device you have, we can't help you with that. But to expedite a solution: Guides to this are found in dozens of corners on the internet, for example
https://stackoverflow.com/questions/33304828/when-trying-to-use-my-usrp-in-gnu-radio-i-get-a-no-devices-found-for

Best,

Marcus

On 18.08.23 10:11, Sowji Srinithi wrote:

Qt GUI: Could not restore geometry: restoreGeometry(self, geometry: Union[QByteArray, bytes, bytearray]): argument 1 has unexpected type 'NoneType' [INFO] [UHD] linux; GNU C++ version 12.3.0; Boost_107400; UHD_4.4.0.0+ds1-4 Traceback (most recent call last): File "/home/sowjanya/Downloads/fm_example.py", line 238, in <module> main() File "/home/sowjanya/Downloads/fm_example.py", line 216, in main tb = top_block_cls() ^^^^^^^^^^^^^^^ File "/home/sowjanya/Downloads/fm_example.py", line 84, in __init__ self.uhd_usrp_source_0 = uhd.usrp_source( ^^^^^^^^^^^^^^^^ RuntimeError: LookupError: KeyError: No devices found for -----> Empty Device Address how to fix this error   

How to fix the above error

On Thu, 17 Aug 2023 at 21:37, <discuss-gnuradio-request@gnu.org> wrote:

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Today's Topics:

   1. Using a signal as a parameter in a block? (tom sutherland)


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Message: 1
Date: Thu, 17 Aug 2023 12:59:58 +0000 (UTC)
From: tom sutherland <alphatozeta@yahoo.com>
To: "discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org>
Subject: Using a signal as a parameter in a block?
Message-ID: <661605185.819399.1692277198996@mail.yahoo.com" target="_blank" moz-do-not-send="true" class="moz-txt-link-freetext">661605185.819399.1692277198996@mail.yahoo.com>
Content-Type: text/plain; charset="utf-8"

I want to use the output value of a signal generator as the delay value of a delay block. Is there a way to pass the output of a signal generator(saw tooth) to the delay block? I have attached an initial grc file and a picture of what I want to do. Any help would be appreciated.Thanks...TomPS Do you know if I need to sign up for any workshops, etc.. at the GNURadio Conference next month or do I just show up and take a seat? I've already registered.



 
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