# USRP2 and USRP N200 broke after UHD?

**URL:** <https://www.ruby-forum.com/t/usrp2-and-usrp-n200-broke-after-uhd/209720>\
**Category:** GNU Radio\
**Created:** [July 21, 2011, 8:25am UTC](https://www.ruby-forum.com/t/usrp2-and-usrp-n200-broke-after-uhd/209720 "2011-07-21T08:25:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\
**Post date:** [July 21, 2011, 8:25am UTC](https://www.ruby-forum.com/t/usrp2-and-usrp-n200-broke-after-uhd/209720/1 "2011-07-21T08:25:36Z")

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I had my USRP2 running usrp2\_fft fine for awhile although it was  
crashing frequently in my ubuntu 10.04LTS VM. I then tried to get our  
new N200 working which requires UHD so I used the build script at:

[http://www.sbrac.org/files/build-gnuradio](http://www.sbrac.org/files/build-gnuradio)

I think the rebuild went okay though not sure I should have run

sudo ./build-gnuradio

and I had to comment out the stuff about timestamp\_timeout in the  
sudoers file as I couldn’t figure out how to modify.

At any rate the build went to completion. If I run uhd\_fft.py it seems  
to be running and I can watch the UDP packets on wireshark except the  
problem is all the data is zeros. The packets seem to be the correct  
size and rate, just data is all zeros. When I close the gui I get:

UHD Error:  
An unexpected exception was caught in a task loop.  
The task loop will now exit, things may not work.  
unknown exception

Also if I run uhd\_usrp\_probe I get:

linux; GNU C++ version 4.4.3; Boost\_104000; UHD\_003.002.000-117f6a3

– Opening a USRP2/N-Series device…  
– Current recv frame size: 1472 bytes  
– Current send frame size: 1472 bytes

UHD Error:  
An unexpected exception was caught in a task loop.  
The task loop will now exit, things may not work.  
unknown exception  
Error: TypeError: Cannot wax cast  
N5boost10shared\_ptrIN3uhd13property\_treeEEE to  
N5boost10shared\_ptrIN3uhd13property\_treeEEE boost::bad\_any\_cast:  
failed conversion using boost::any\_cast

Note that the USRP2 also is only sending out packets with data as zero.

I just built this today and I see there was new release yesterday so  
maybe I shouldn’t be going from source. Maybe there’s apt-get that has  
uhd for USRP N200? Otherwise, any help to resolve the uhd issue is  
appreciated. Thanks

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**Author:** ![Tech](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/a9a28c/32.png) [@Tech](https://www.ruby-forum.com/u/Tech)\
**Post date:** [July 21, 2011, 8:32am UTC](https://www.ruby-forum.com/t/usrp2-and-usrp-n200-broke-after-uhd/209720/2 "2011-07-21T08:32:25Z")

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> I just built this today and I see there was new release yesterday so  
> maybe I shouldn’t be going from source. Maybe there’s apt-get that has  
> uhd for USRP N200? Otherwise, any help to resolve the uhd issue is  
> appreciated. Thanks

Both of these errors are related to some bug in ubuntu 10.04. The  
workarounds have been pushed, please grab the latest source.

Cast error: the compiler did something bad with the RTTI, the symbol in  
the lib does not match the one in the executable

Unexpected exception: boost thread sleep throws something other than  
interruption exception when interrupted

I wouldnt worry about seeing zero data, the device could not have been  
streaming with those errors.

-josh