From: [email protected] [[email protected]] on behalf of Tom
Rondeau [[email protected]]
Sent: 07 October 2014 16:27
To: David Halls
Cc: [email protected]
Subject: Re: [Discuss-gnuradio] CC encoder definition
(variable_cc_encoder_def)
On Tue, Oct 7, 2014 at 10:40 AM, David Halls
<[email protected]mailto:[email protected]>
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
“self.$(id) = $(id) = fec.cc_encoder_make($framebits, $k, $rate,
$polys, $state_start, $mode, $padding)”
Is that OK? I can also manually create the Encoder Objects variable as
fec.cc_encoder_make(frame_size*8, k, rate, (polys), start_state,
fec.CC_TERMINATED, padding)
how would I add the parallelism
(fec.cc_encoder_make(frame_size8, k, rate, (polys), start_state,
fec.CC_TERMINATED, padding);fec.cc_encoder_make(frame_size8, k, rate,
(polys), start_state, fec.CC_TERMINATED, padding))
or similar?
From:
discuss-gnuradio-bounces+david.halls=removed_email_address@domain.invalidmailto:[email protected]
[mailto:discuss-gnuradio-bounces+david.hallsmailto:discuss-gnuradio-bounces%2Bdavid.halls[email protected]mailto:[email protected]]
On Behalf Of David Halls
Sent: 07 October 2014 15:21
To: [email protected]mailto:[email protected]
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
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