Re: [Discuss-gnuradio] CC encoder definition (variable_cc_encoder_def)
From:
David Halls
Subject:
Re: [Discuss-gnuradio] CC encoder definition (variable_cc_encoder_def)
Date:
Tue, 7 Oct 2014 16:08:55 +0000
________________________________________
From: address@hidden address@hidden on behalf of Tom Rondeau address@hidden
Sent: 07 October 2014 16:27
To: David Halls
Cc: address@hidden
Subject: Re: [Discuss-gnuradio] CC encoder definition (variable_cc_encoder_def)
On Tue, Oct 7, 2014 at 10:40 AM, David Halls <address@hidden<mailto:address@hidden>> wrote:
The problem appears to be using <var_make> and <var_value> in the xml files.
Presumably this is a new(ish) additional functionality in GNU Radio, which my old version can’t parse?
Yes, those are new in 3.7 (3.7.4, I think but would have to check to verify). It's a way of letting us build objects within GRC and use them as such in other areas of the flowgraph. So you can define an FEC variable and call methods on it, like cc.K() to get the CC's constraint length.
You can probably remove these from the .xml files and lose that functionality. It's a nice convenience but not necessary. You can replace it by having another variable, say for K, and use that in any place you might require it instead of pulling it straight from the CC variable itself.
Tom
Thanks Tom, that is a useful piece of functionality indeed. I commented out the <var_make> and <var_value> and have instead
From: address@hidden<mailto:address@hidden> [mailto:discuss-gnuradio-bounces+david.halls<mailto:discuss-gnuradio-bounces%2Bdavid.halls>address@hidden<mailto:address@hidden>] On Behalf Of David Halls
Sent: 07 October 2014 15:21
To: address@hidden<mailto:address@hidden>
Subject: [Discuss-gnuradio] CC encoder definition (variable_cc_encoder_def)
Dear All,
I am trying to get the latest gr-fec code running in an older version of GNU Radio. I know this sounds like a terrible idea, and I don’t expect any sympathy but there is a reason why we can’t upgrade to the newest GNU Radio, due to some legacy issues.
If you are still reading…
I can’t get the CC Encoder Definition block to appear in GNU Radio, we are using 3.7.2. I have copied the whole of the gr-fec folder from the latest install including the grc folder which contains ‘variable_cc_encoder_def_list.xml’. Is there something else fundamentally missing from older version of GNU Radio to support this kind of definition block?
Thanks!
David
---------------------------------------------------------------
David Halls Ph.D.
Research Engineer
Toshiba Research Europe Limited
32 Queen Square, Bristol, BS1 4ND, UK
Tel: +44 (0) 117 906 0790<tel:%2B44%20%280%29%20117%20906%200790>
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