Obtaining 'time_spec' from Out-of-tree C++ Module

GNU Radio
1

Dear All,

I would like to have knowledge of the USRP time in my transmitter flow
graph. In the receiver flow graph this is straight forward because
‘rx_time’ tag is propagated from a USRP source as a tag.

How can I obtain the time_spec from a c++ block in my transmitter flow
graph?

“usrp_sink_impl.cc” has the function

::uhd::time_spec_t
usrp_sink_impl::get_time_now(size_t mboard)
{
  return _dev->get_time_now(mboard);
}

But how can I call this from outside the usrp_sink block?

Many thanks!

David

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2

Hello David,

as get_time_now is a public function of usrp_sink, it is accessible from
everywhere :slight_smile:
You’ll need a (shared) pointer to that usrp_sink;using that, you can do
something like
uhd::time_spec_t now = my_usrp_sink->get_time_now();
You could, for example, take an usrp_sink::sptr as an argument for your
block’s constructor and store that reference to use it later in your
work()
function.

Greetings,
Marcus

On Wed, Apr 30, 2014 at 2:26 PM, David Halls

3

Hi Marcus!

get_time_now is a public function of usrp_sink, it is accessible from
everywhere :slight_smile:

Great, I thought it was a public function, just wasn’t sure how to get a
pointer to it.

uhd::time_spec_t now = my_usrp_sink->get_time_now();

Sure thing.

You’ll need a (shared) pointer to that usrp_sink

I am not clear how I obtain that (to then I pass it to my C++ module as
a constructor?)

Regards,

David

From: Marcus Müller [[email protected]]
Sent: 30 April 2014 14:37
To: David Halls
Cc: [email protected]
Subject: Re: [Discuss-gnuradio] Obtaining ‘time_spec’ from Out-of-tree
C++ Module

Hello David,

as get_time_now is a public function of usrp_sink, it is accessible from
everywhere :slight_smile:
You’ll need a (shared) pointer to that usrp_sink;using that, you can do
something like
uhd::time_spec_t now = my_usrp_sink->get_time_now();
You could, for example, take an usrp_sink::sptr as an argument for your
block’s constructor and store that reference to use it later in your
work() function.

Greetings,
Marcus

On Wed, Apr 30, 2014 at 2:26 PM, David Halls
<[email protected]mailto:[email protected]>
wrote:
Dear All,

I would like to have knowledge of the USRP time in my transmitter flow
graph. In the receiver flow graph this is straight forward because
‘rx_time’ tag is propagated from a USRP source as a tag.

How can I obtain the time_spec from a c++ block in my transmitter flow
graph?

“usrp_sink_impl.cc” has the function

::uhd::time_spec_t
usrp_sink_impl::get_time_now(size_t mboard)
{
return _dev->get_time_now(mboard);
}

But how can I call this from outside the usrp_sink block?

Many thanks!

David

NOTE: The information in this email and any attachments may be
confidential and/or legally privileged. This message may be read, copied
and used only by the intended recipient. If you are not the intended
recipient, please destroy this message, delete any copies held on your
system and notify the sender immediately.

Toshiba Research Europe Limited, registered in England and Wales
(2519556). Registered Office 208 Cambridge Science Park, Milton Road,
Cambridge CB4 0GZ, England. Web:
www.toshiba.eu/research/trlhttp://www.toshiba.eu/research/trl

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confidential and/or legally privileged. This message may be read, copied
and used only by the intended recipient. If you are not the intended
recipient, please destroy this message, delete any copies held on your
system and notify the sender immediately.

Toshiba Research Europe Limited, registered in England and Wales
(2519556). Registered Office 208 Cambridge Science Park, Milton Road,
Cambridge CB4 0GZ, England. Web: www.toshiba.eu/research/trl