Forum: GNU Radio Using gr_uhd on Windows

Hi List,

Happy new year for everyone.

I've install gnuradio v3.6.3rc and uhd v3.5.0 on Win7 64 bit. I get 
error:
gri_fftw: gri_fftw: gr_pagesize: no info; setting pagesize = 4096

thread[thread-per-block[0]: <gr_block gr uhd usrp source (1)>]: 
ValueError:
bad vrt header or packet fragment
whenever I call gr_top_block.lock()/unlock(), stop()/start() functions.
Could you help me, please?

Thanks so much.

LTP.

On 01/01/2013 09:53 PM, Luong Tan Phong wrote:
> Hi List,
>
> Happy new year for everyone.
>
> I've install gnuradio v3.6.3rc and uhd v3.5.0 on Win7 64 bit. I get error:
> gri_fftw: gri_fftw: gr_pagesize: no info; setting pagesize = 4096
>

You can ignore this warning above

> thread[thread-per-block[0]: <gr_block gr uhd usrp source (1)>]: ValueError:
> bad vrt header or packet fragment
> whenever I call gr_top_block.lock()/unlock(), stop()/start() functions.
> Could you help me, please?

What device/model are you using? That way I can try to replicate the
issue. Those methods above all cause streamers to be created/destroyed.
So there may be an issue w/ cleanup or init.

Also..
Are you using lock()/unlock(), stop()/start() to dynamically reconfigure
the flow graph at runtime? If that is the case, you may have better luck
with the stream selector in grextras which can re-route streams on the 
fly:

https://github.com/guruofquality/grextras/wiki#wik...

-josh