I have a problem using a B200-mini on a Ubuntu 20.04 machine

The device is recognised on the USB bus

Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 008: ID 2500:0021 Ettus Research LLC USRP B200-mini
Bus 001 Device 006: ID 10c4:ea60 Silicon Labs CP210x UART Bridge

But not using uhd_find_devices (or uhd_usrp_probe)

uhd_find_devices
[INFO] [UHD] linux; GNU C++ version 11.3.0; Boost_107400; UHD_4.4.0.0-68-g02558b69

-- UHD Device 0

Device Address:
serial: 327D7FC
fpga: HG
name:
product: X310
resource: RIO0
type: x300

(the linux machine does have a PCIe interface to a X310 - which is listed)

The fpga and firmware images on the machine appear to be up-to date (using. uhd_images_downloader)

I have confirmed that the B200-mini works by plugging it into another computer (a Mac) - here is the output from uhd_find_devices on that machine

[INFO] [UHD] Mac OS; Clang version 14.0.0 (clang-1400.0.29.202); Boost_108100; UHD_4.4.0.0-47-gd18647dd
[INFO] [B200] Loading firmware image: /opt/local/share/uhd/images/usrp_b200_fw.hex...

-- UHD Device 0

Device Address:
serial: 31E21E3
name: B200mini
product: B200mini
type: b200

What could be wrong on the Ubuntu machine - and how can I fix it?

Ian Chodera
MD1 Technology Ltd.

e: iac@md1tech.co.uk
w: www.md1tech.co.uk



MD1TechnologyLtd. is registered in England & Wales with company number 09378746.
Registered address: Cheltenham Film & Photographic Studios, Hatherley Lane, Cheltenham, Gloucestershire, England. GL51 6PN.
VAT registration number: GB 206 3877 05

Hi Ian,

On 2023-04-21 13:09 +0100, Ian Chodera wrote:

[...]

If uhd_find_devices works under the root user,
then it might be an issue with missing udev rules.
You can find the procedure there:
https://files.ettus.com/manual/page_transport.html#transport_usb_udev

Best regards

Cédric Hannotier

Hi Ian,

that looks quite good:

On 21.04.23 14:09, Ian Chodera wrote:

So, first thing I'd try is

uhd_find_devices --args 'type=b200'

to force UHD to look for B200-series devices (which does include the B210, and B20x-mini
variants).

If that doesn't help, might be a permission problem. How did you install UHD on your machine?

Best regards,
Marcus

Hi Cedric and Marcus

Thanks for the replies. Neither of them have helped though

No UHD Devices Found

I had in fact already tried both option, having trawled the internet for suggestions before joining this list

Ian Chodera
MD1 Technology Ltd.

e: iac@md1tech.co.uk
w: www.md1tech.co.uk



MD1TechnologyLtd. is registered in England & Wales with company number 09378746.
Registered address: Cheltenham Film & Photographic Studios, Hatherley Lane, Cheltenham, Gloucestershire, England. GL51 6PN.
VAT registration number: GB 206 3877 05

On 21/04/2023 09:00, Ian Chodera wrote:

Three things occur to me:

Is it possible that you're plugged in to a USB-1.1 port?  (This seems
unlikely these days, but maybe?)

The UHD library you're using was built without B2xx support because
libusb wasn't installed at the time of the build.

You updated the udev rules, but didn't command udev to reload the rules
and/or didn't replug the device

On 2023-04-21 14:00 +0100, Ian Chodera wrote:

From this:

I am guessing it is locally compiled (version points to current master).
Does the output of "uhd_config_info --enabled-components" contain
"USB" and "B200" under "Enabled components"?
If it contains both of them, then I am out of ideas...

Best regards

Cédric Hannotier