[USRP-users] Possible Bug in E310 usrp_sink

Marcus D. Leech mleech at ripnet.com
Tue Mar 8 18:54:47 EST 2016

On 03/08/2016 06:45 PM, Peter Witkowski via USRP-users wrote:
> Hello,
> I have an E310 that is running a simple GNU Radio Companion flow 
> graph.  The flow graph just connects a file_source to a usrp_sink and 
> configures the USRP with various parameters such as sample rate, 
> center frequency, etc.
> Everything works, unless I try to stop the flow graph and then 
> restart.  That is, I call start() on my generated top block, then 
> stop()/wait() and then start() again. Specifically, the following 
> error gets printed:
> thread[thread-per-block[1]: <block gr uhd usrp sink (1)>]: 
> AssertionError: _send_entries_in_use.at 
> <http://send_entries_in_use.at>(which_stream) <= H2S_NUM_CMDS
>   in uhd::transport::zero_copy_if::sptr 
> e300_fifo_interface_impl::_make_xport(size_t, const 
> uhd::transport::zero_copy_xport_params&, bool)
>   at 
> /home/balister/e300-oe-build/build/tmp-glibc/work/armv7ahf-vfp-neon-oe-linux-gnueabi/uhd/
> Note that I am running the factory microSD card that came with the 
> SDR.  The UHD version is 3.8.4.  I haven't yet tried upgrading to a 
> newer version, but that's my next step.
> Any help would be great.  Note that my current workaround is to call 
> "del" on the top block after I'm done with it.  If I then make a new 
> top block, the problem goes away (I can call start() on the new 
> object).  This leads me to believe that some clean-up routine is not 
> being called when stop() is being called.
> Thanks in advance for the help.
I'd strongly recommend upgrading to the latest image:


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