Retrying in plain text, since browser/outlook ate the XML I had typed:
Hi David,
Making the parameter vary at runtime is simple and just needs some extra XML
and python code.
The parameter should be an argument to the __init__ method (constructor) of
your block and should
have a "" declaration in the matching XML file. Let's say the parameter name is
"variable_param" with a declaration like:
Variable parameter
variable_param
42
int
Then you need to add the following in the XML file:
set_variable_param($variable_param)
And you need to implement the "set_variable_param" method in your python class
to take whatever
action is needed when the parameter value changes. This method will be called
every time the value
of the expression in the underlined "Variable parameter" box in the GUI
changes. The method will look
like:
def set_variable_param(self, new_value):
whatever code
This should make GRC underline the variable_param in the GUI and it will be
variable at runtime.
Thanks,
--Patrick
From: mcqui...@sfu.ca
Date: Thu, 24 Sep 2015 10:35:34 -0700
To: david.ha...@toshiba-trel.com
CC: discuss-gnuradio@gnu.org
Subject: Re: [Discuss-gnuradio] Function Probe and OOT Blocks
Hi David:
I'm a relative newbie myself, but I can say that I had this same issue. I had
a block with a static parameter that I wanted to be able to change dynamically
at runtime.
I looked at the block's source code, and also at a block that had a dynamically
adjustable parameter.
Basically, and with a little help from the list (Marcus Muller in particular)
as I had to learn c++, I was able to use the code from the dynamic block as an
example, and modify the static block to change the parameter to be dynamically
changeable. It all came down to at most a couple dozen lines of code. The
bigger challenge was learning about Gnuradio's architecture, to know what to do.
I would suggest a similar approach. You will find the list members very
helpful. I'd also look at the guided tutorials, there are good examples there
under "how to write a c++ block".
I will help if I can but alas, I am still quite a newbie, so others will be
able to help much more efficiently!
Kevin
Sent from my iPad
On Sep 23, 2015, at 4:12 AM, David Halls wrote:
Hi guys,
I am familiar with using function probes to update values to blocks. This is
straightforward with built in blocks like Multiply Const, where the input is
underline in the GRC dialogue box.
How do I create a block, specifically a Python block, that allows me to update
parameters in this fashion so that they are not fixed at runtime?
Regards,
David
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