Re: [Discuss-gnuradio] Issue with deinterleave block from a file source

On Tue, Sep 23, 2014 at 12:22 PM, Martin Braun <address@hidden> wrote:

On 23.09.2014 09:08, address@hidden 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

Martin, Ruben,

Thanks for pointing this out. Check out this patch here:

https://gist.github.com/trondeau/7d5d06ea2f0586f0e9e4

Passes all our QA, doing the right thing in my test setup, and working about 20x faster than before.

Tom

Ruben

-----Original Message-----
From: discuss-gnuradio-bounces+ruben.merz=address@hiddenorg
[mailto:discuss-gnuradio-bounces+ruben.merz=swisscom.address@hidden] On
Behalf Of Martin Braun
Sent: Tuesday, September 23, 2014 5:40 PM
Cc: address@hidden
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, address@hidden 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=address@hiddenorg
[mailto:discuss-gnuradio-bounces+ruben.merz=swisscom.address@hidden] On
Behalf Of Martin Braun
Sent: Tuesday, September 23, 2014 1:11 AM
Cc: address@hidden
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, <address@hidden> 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

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From:	Tom Rondeau
Subject:	Re: [Discuss-gnuradio] Issue with deinterleave block from a file source to USRP sink with x300
Date:	Tue, 23 Sep 2014 13:55:03 -0400