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Re: [Discuss-gnuradio] missing internal callbacks

From: Activecat
Subject: Re: [Discuss-gnuradio] missing internal callbacks
Date: Fri, 4 Jul 2014 10:36:17 +0800

On Fri, Jul 4, 2014 at 5:40 AM, <address@hidden> wrote:

when creating a flowgraph in GRC there are times I would like to change the decimation on-the-fly with a gui slider.  However, this does not work because the decimation factor in blocks such as the AM Demod or Decimating Fir Filter does not have an internal callback (as I understand it).  My main purpose is to be able to dynamically change the sampling rate to re-scale the x-axis in a gui fft sink while the flowgraph is operating.  Is there a way around this?  Is this a necessary limitation, or just something nobody has gotten around to implementing?

It is not impossible to have a block that its decimation factor or/and sampling rate could be changed on the fly.
Create your own block, inherited from general block.
But it is tricky to code it correctly, need a lot of skill and testings.

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