Re: [Discuss-gnuradio] E310: Setting "master clock"

[CEL]

Hi Mike, Martin and Marcus,

I'll argue that from a mile high that changing MCR at runtime of a GR
flow graph is an *extreme* corner case: It de-facto requires teardown
of the UHD streamer, right (when else would you need it)? And that
really doesn't fit all too nicely with GNU Radio's streaming
architecture, right?

But, Mike, are we discussing the right thing here?

Still, I think Mike's original problem is the following:

* Generated Flow Graph with GRC
* Used Parameter block to specify parameter of a specific block
* said parameter never got set

That'd sound like a GRC bug more than anything explicitly related to
UHD.

Am I understanding your problem correctly, Mike?

Best regards,
Marcus

On Thu, 2018-07-12 at 14:00 -0400, Marcus D. Leech wrote:
> On 07/12/2018 01:49 PM, Martin Braun wrote:
> > On 07/10/2018 01:40 PM, Marcus D. Leech wrote:
> > > > It seems to work properly. I get indications during start up that the
> > > > E310 is selecting the clock_rate per my settings, and it's also not
> > > > throwing any decimation error when I deliberately mismanage the
> > > > clock-sample rate ratio.
> > > > 
> > > > So, does anyone see a problem with what I've done or how?
> > > > Is there a doc with these settings spelled out?  I recall digging hard
> > > > even for samp_rate and center_freq.
> > > > 
> > > > Thanks!
> > > > 
> > > > Mike
> > > > 
> > > 
> > > Actually, normally, the master_clock_rate is set in a device argument:
> > 
> > The AD9361-based devices allow modifying the sample rate at runtime, and
> > the E310 is one of those devices.
> > 
> > -- M
> > 
> > 
> 
> Yes, but GRC doesn't really provide any way of modifying the *master 
> clock rate* at runtime--the methods are in gr-uhd, but there's no
>    runtime way of using them if you stick to GRC (unless there are 
> messages that can do this, which I missed).
> 
> 
> 
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