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Re: [Discuss-gnuradio] GRC problems

From: Johannes Demel
Subject: Re: [Discuss-gnuradio] GRC problems
Date: Sat, 12 Oct 2013 13:58:31 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0

On 12.10.2013 10:58, Jared Clements wrote:
> I'll confirm that #2 is either a bug or merely unexpected behavior.  I
> work around it by prototyping hier blocks as custom GRC blocks, then
> using that to build an OOT module block that actually works.  Being
> unable to enter parameters at run time is severely limiting.

For now this is the solution of choice. But in my opinion a graphical
representation helps to understand a flowgraph and I want to create
everything as self-explanatory as possible.

> I've not experienced #1, that functionality seems to work once I get the
> python file and the GRC file matching.  I was getting the same errors
> for a while until I found the right idiom.

Can you share your setup? Or point to a repository? That would be very


> Jared
> On Oct 12, 2013 11:18 AM, "Johannes Demel" <address@hidden
> <mailto:address@hidden>> wrote:
>     Hi list,
>     I discovered 2 problems with GRC recently.
>     1. I have a custom block with a message port (with a fixed port name)
>     and some stream ports which include a <nports>...</nports> definition.
>     The whole thing works fine as long as I have a fixed number of ports.
>     Each declared separately. But as soon as I use a nport statement GRC
>     won't display this block correctly [1]. Even worse if I enter values
>     which affect the number of ports, the whole flowgraph will disappear.
>     Just a grey flowgraph page.
>     2. To make things easier for me (and to not create a well known kind of
>     artwork) I use hier blocks. This works fine as long as I have fixed size
>     vector ports. But adding a parameter block, say vlen, for vector size to
>     dynamically change the hier block doesn't work. The python generator
>     does not generate the hier block python file with vlen as vector size.
>     Instead it puts in the default value. A parameter block without default
>     value results in an error. A hard coded vector size is not exactly
>     helpful in this case.
>     I didn't have time to dig into it yet. Thus I thought I share my
>     experience with you. Maybe I am not the only one with this problem and
>     someone already knows how to fix it.
>     Happy hacking
>     Johannes
>     [1]
>     <sink>
>       <name>msg</name>
>       <type>message</type>
>       <optional>1</optional>
>     </sink>
>     <sink>
>       <name>in</name>
>       <type>complex</type>
>       <vlen>$vlen</vlen>
>       <nports>$ports</nports>
>     </sink>
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