Re: [Discuss-gnuradio] Fwd: Crash some time after running 2 channel full duplex B210

[Marcus D. Leech]

On 11/24/2015 04:54 PM, Saulo Queiroz wrote:
> Hi,
>
> I got the following message after some (random) period of time running 
> a grc example (derived from gr-ieee802-11) on B210.
>
>  gr uhd usrp source0 - USRP Source Block caught rx error code: 2
>
> In my grc I have one Sink and one Source UHD block. Both has 2 active 
> channels configured as below:
>
> master_clock_rate=15.36e6 and Sample rate= 7.68e6
>
> Ch0: Center Freq (for both sink and source)
> uhd.tune_request(5.6e9 + 2.5e6 , rf_freq = 5.6e9, rf_freq_policy = 
> uhd.tune_request.POLICY_MANUAL)
>
> Ch1: Center Freq (for both sink and source)
> uhd.tune_request(5.6e9 - 2.5e6 , rf_freq = 5.6e9, rf_freq_policy =  
> uhd.tune_request.POLICY_MANUAL)
>
> With this I intend to enable B210 to keep simultaneously independent 
> TXs through different channels while receiving through these same 
> channels (I don't care about cross talk now). Does it sound right? Is 
> this feasible on B210?
> If im not missing something, this succeeds for a while before I get 
> the error message.
>
> OTHER INFO
> Ubuntu 14.04, usb 3.0 (b210 alone in the bus), UHD_003.009.000-0-gcd88f80f
>
> many thanks,
>
> --
> Saulo Jorge bq
> - "Beware of bugs in the above code; I have only proved it correct, 
> not tried it."
> Donald Knuth.
What type of USB-3.0 controller do you have?

Have you tried tuning num_recv_frames and num_send_frames:

http://files.ettus.com/manual/page_transport.html#transport_usb