Re: [Discuss-gnuradio] inband timestamp issues

[Ketan Mandke]

George,

I am sure that Steve will check the single rx-chain and get back to
you with the results of that test.

Although, I have a hypothesis about what might be happening. Is it
possible that there are some control signals being sent to the USRP
over the command channel that disable the rx_buffer_inband while they
execute? Perhaps this is happening unbeknownst to us. I guess the more
general question here is what events/conditions cause the
packet_builder to be disabled?

On Wed, Jul 23, 2008 at 1:28 PM, George Nychis <address@hidden> wrote:
>
>
> Steve Peters wrote:
>>
>> Hi George,
>>
>> Thanks for the quick and thought-out response.  I actually tried with
>> the new rbf yesterday.  It produces no noticeable differences in the
>> output I'm interested in at this point.
>>
>
> Not getting an underrun is good.  There may very well be an issue with the
> FPGA.  Could you do me a favor and see if you get these timestamp jumps
> using the single RX chain application?  I'd be interested to know if it is
> something due to the complication of using two RX chains, or if there is
> something inherently wrong with the timestamp.  I know what you're
> interested in is the timestamp gap between the two channels, and it being
> consistent, but I want to know if you get these timestamp jumps using the
> single chain.
>
> It just helps me narrow down the issue.  There was a point in time where I
> wasn't even going to release a 2TX/RX RBF because it had some fitting issues
> in the FPGA with all of the new inband stuff.  I had to clean up some unused
> code to get it to fit.  The only reason I actually made an effort to build
> the 2TX/RX RBF was because of your research group ;)
>
> I spend all of my time working with the single chain, and if I find bugs I
> can fix them.  But I think you're the only ones using the dual chain... so
> your feedback is useful and I'd appreciate any help solving the problems.  I
> don't really know Verilog, and our Verilog coder is at an internship right
> now ;)
>
> - George
>



-- 
Ketan Mandke