Re: [Discuss-gnuradio] using uhd_fft with USRP1

[Martin Braun]

Hey Don,

this is a bug in UHD, which is fixed on the current 'master'. If you're
using 'master', you can simply update UHD and reinstall (git pull etc.).

If you can't update for some reason right now, --wire-format=sc16 might
help.

Cheers,
Martin

On 04/29/2014 09:58 PM, Don Latham wrote:
> 
> Ok, I got the address correct, I know the usrp and daughtercard are there. I
> can't get the simplest uhd_fft to run from GRC.  I get the following message
> on trying to execute, Generating the graph works.
> 
> -- Opening a USRP1 device...
> -- Using FPGA clock rate of 64.000000MHz...
> Using Volk machine: avx_64_mmx_orc
> thread[thread-per-block[0]: <block gr uhd usrp source (1)>]: LookupError:
> KeyError: Cannot find an item size:
> 
> The error output, as usual, has no meaning for me, entirely arcane.  I'm
> running Ubunu 12.04.4 64 bit and gnuradio installed without a burp. Actually,
> the error message looks like something to do with multithreading. I tried the
> archives, no help.
> 
> uhd_usrp_probe says the usrp1 is there and reports the daughterboards that are
> really there.
> so, need an interpreter, please.
> Thanks, Don
> 
>