Re: [Discuss-gnuradio] Issue with deinterleave block from a file source to USRP sink with x300

On 23.09.2014 09:08, Ruben.Merz@swisscom.com wrote:
> I was expecting that answer (not the jumping up and down part, but the let's fix the right problem).
>
> I can try to fix it, I just need to find some time. Would you have a good example of another block to look into?

First of all, you'll need to change check_topology to this:

bool
deinterleave_impl::check_topology(int ninputs, int noutputs)
{
set_relative_rate(1.0/double(noutputs));
d_noutputs = noutputs;
return true;
}

Notice the rate change fix.
Then, work needs to consume as much as possible (right now, it's as
little as possible). stream_mux might be a good example for how to do
that. The difficulty is, you need to keep track of where you are, what
you have consumed etc.
Which is probably why this wasn't implemented properly the first time
'round :)

M



> Ruben
>
>> -----Original Message-----
>> From: discuss-gnuradio-bounces+ruben.merz=swisscom.com@gnu.org
>> [mailto:discuss-gnuradio-bounces+ruben.merz=swisscom.com@gnu.org] On
>> Behalf Of Martin Braun
>> Sent: Tuesday, September 23, 2014 5:40 PM
>> Cc: discuss-gnuradio@gnu.org
>> Subject: Re: [Discuss-gnuradio] Issue with deinterleave block from a file
>> source to USRP sink with x300
>>
>> I usually jump up and down with excitement when people send
>> documentation patches, but this is not one that should go in GNU Radio.
>> First of all, deinterleave and stream_to_streams are not identical unless you
>> have unit block size. Second, we should fix the deinterleaver rather than
>> pointing out it is broken in the docs.
>>
>> Would you want to fix the deinterleaver? Basically, it needs to follow the
>> 'process as much as you can' paradigm.
>>
>> M
>>
>> On 23.09.2014 00:02, Ruben.Merz@swisscom.com wrote:
>>> Indeed.
>>> Would the following patch to the documentation be useful (since streams to
>> stream seems to replace it properly)?
>>>
>>> diff --git a/gr-blocks/include/gnuradio/blocks/deinterleave.h
>>> b/gr-blocks/include/gnuradio/blocks/deinterleave.h
>>> index a3b5480..1b9d5c1 100644
>>> --- a/gr-blocks/include/gnuradio/blocks/deinterleave.h
>>> +++ b/gr-blocks/include/gnuradio/blocks/deinterleave.h
>>> @@ -40,6 +40,10 @@ namespace gr {
>>> * a single input to each output unless blocksize is given in the
>>> * constructor.
>>> *
>>> + * This block can only process one block at a time. Therefore its
>>> + * efficiency may be limited. It is advised to use the streams to
>>> + * stream block instead.
>>> + *
>>> * \code
>>> * blocksize = 1
>>> * connections = 2
>>>
>>> Ruben
>>>
>>> From: discuss-gnuradio-bounces+ruben.merz=swisscom.com@gnu.org
>>> [mailto:discuss-gnuradio-bounces+ruben.merz=swisscom.com@gnu.org] On
>>> Behalf Of Martin Braun
>>> Sent: Tuesday, September 23, 2014 1:11 AM
>>> Cc: discuss-gnuradio@gnu.org
>>> Subject: Re: [Discuss-gnuradio] Issue with deinterleave block from a
>>> file source to USRP sink with x300
>>>
>>> It seems deinterleave is both buggy and inefficiently designed. The bug is
>> the relative rate is wrong, the inefficiency is that it only works on one block at
>> a time. I suggest using something else.
>>>
>>> M
>>>
>>> On Fri, Sep 19, 2014 at 2:58 PM, <Ruben.Merz@swisscom.com> wrote:
>>> Hello,
>>>
>>> I have the following setup: a file source, a deinterleave block and a USRP
>> sink (see the attached .grc and related .png). This setup is a test to distribute
>> two different signals on two channels of the USRP x300 (the file source loads a
>> binary file with alternated channels containing 64 bit long IQ samples - 32 real
>> followed by 32 imaginary - channel 1/channel 2/channel 1/channel 2/etc...).
>>>
>>> The hardware is a USRP x300 with two wideband SBX (SBX-120) boards.
>>>
>>> Now, the above setup used to function without a hitch. But recently, it
>> completely freezes gnuradio. Basically, I start the flowgraph and quickly get a
>> large number of 'L' and no signal is transmitted. The only thing I can do is then
>> to kill gnuradio-companion and related python processes.
>>>
>>> The interesting thing is that if I replace the deinterleave block by a "stream
>> to streams" block, everything works fine. I am bit puzzled as to what I am
>> missing.
>>>
>>> The operating system is Ubuntu 14.04 LTS (updated state), UHD is the head
>> of the maint branch, and gnuradio as well (UHD_003.007.002-2-gdb35bf46
>> and Gnuradio: 9dcb5067c55a0630c9edca6b62a32b1f8e633930). Firmware
>> is also the most recent. I have attached the .grc, and the binary file I am using
>> can be obtained here: http://www.net.t-labs.tu-
>> berlin.de/~ruben/files/sine_test_10kHz_20kHz_cpx_float_2chan_interleaved
>> _1MSs.bin.
>>>
>>> Assuming there is not something wrong in my .grc setup, how do I debug this
>> issue?
>>> Thanks for any suggestion or help,
>>> Ruben
>>>
>>> _______________________________________________
>>> Discuss-gnuradio mailing list
>>> Discuss-gnuradio@gnu.org
>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>
>>
>>
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