Forum: GNU Radio USRP continues to transmit after usrp_siggen.py stopped

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29e8d18c0e2824da57ecb67d0be869c2?d=identicon&s=25 Kimminau Jr., Leo F. (Guest)
on 2009-01-26 21:17
(Received via mailing list)
Using a PowerMac G5 to control the USRP, if I stop usrp_siggen.py, the
USRP continues to transmit.  Is this expected?

This behavior is different than on a PowerBook G4, where the USRP stops
transmitting when usrp_siggen.py is stopped.


Leo Kimminau
D0072e69d706bb3ca211d33a1b536e2c?d=identicon&s=25 Johnathan Corgan (Guest)
on 2009-01-27 06:05
(Received via mailing list)
On Sun, Jan 25, 2009 at 9:21 PM, Kimminau Jr., Leo F. <lfk@mitre.org>
wrote:

> Using a PowerMac G5 to control the USRP, if I stop usrp_siggen.py, the USRP
> continues to transmit.  Is this expected?

No.

> This behavior is different than on a PowerBook G4, where the USRP stops
> transmitting when usrp_siggen.py is stopped.

Can you elaborate on any other differences between the configurations?
 OS version, GNU Radio version, developer tools (GCC, swig, Python),
etc.?

Thanks

-Johnathan
745d8202ef5a58c1058d0e5395a78f9c?d=identicon&s=25 Eric Blossom (Guest)
on 2009-01-27 11:23
(Received via mailing list)
On Mon, Jan 26, 2009 at 09:03:32PM -0800, Johnathan Corgan wrote:
> Can you elaborate on any other differences between the configurations?
>  OS version, GNU Radio version, developer tools (GCC, swig, Python),
> etc.?
>
> Thanks
>
> -Johnathan

I think this is a known problem (not sure there's a ticket on it).  I
believe that what is happening is that on the faster machine, the Tx
pipeline in the FPGA is getting disabled before it has a chance to
drain.  The result of this is that the pipeline is halted with a
non-zero constant value getting clocked into the DACs resulting in a
carrier for all daughterboards that contain an LO.

Eric
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