Re: [Discuss-gnuradio] UHD Source Block and N210/SBX Synchronisation

[Marcus D. Leech]

On 03/02/2016 08:41 AM, Nigel Steed wrote:

Hi Marcus,

 

I have now tried exactly that and it works. Thanks. One thing I am trying now is to implement the command times over the message ports but if you say time commands are not supported in gr-uhd I maybe stuck. I see the functions are in a ifdef.

 

Thanks,

 

Nigel

Again, gr-uhd has bindings for timed-commands, it's just that the *GRC* block logic has no way of using them.  But if you hand-code
  Python, or edit the output of GRC, you can wrap your tunings in timed commands.

 

From: address@hidden [mailto:address@hidden] On Behalf Of Marcus D. Leech
Sent: 02 March 2016 02:08
To: address@hidden
Subject: Re: [Discuss-gnuradio] UHD Source Block and N210/SBX Synchronisation

 

On 03/01/2016 10:43 AM, Marcus D. Leech wrote:

The only thing really missing in gr-uhd is the ability to do timed commands.   You can force integer-N mode by constructing your own
  tune_request that includes the integer-N option.  You'd use a feature from the latest Gnu Radio to help you with this, because it involves
  getting into the internal structure of a tune_request blob.   So, use the "Python module" block, and in that Python do something like:

def integer_N_tune_me(freq):
    r = uhd.tune_request(freq)
    r.args = {"mode_n" : "integer"}
    return r

Then, in your UHD source/sink block, instead of using your target frequency directly, use:

your_module_name.integer_N_tune_me(desired_freq)



Martin could probably comment on the feasibility of adding timed commands to gr-uhd.

What I actually meant wasn't that gr-uhd doesn't have timed-command support, but rather, the GRC scaffolding for this doesn't really
  exist.  If you write your own Python, you can of course use timed-commands with gr-uhd, and in fact if you're willing to edit the
  output of GRC (generated Python) you can wire-in timed-commands fairly easily, it's just that there's no way to set this up with
  the existing UHD blocks for GRC (yet).

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