I have a USRP with a GPSDO. I am working on a block that will poll a USRP for
PPS changes in an attempt to adjust for clock offset between host and USRP.
Assume I have explicitly set the USRP time-of-day correctly to UTC using PPS
and a set_time_next_pps_call, and GPS is locked.
I would like to pass a USRP sink (or source) shared pointer to this block. It
will have its own internal thread that will loop waiting for PPS edge
transitions, polling with get_time_now, and then measuring offset between
PC/system clock and USRP clock.
Following guidance from a mailing list thread [1], I attempted to pass a
usrp_sink shared pointer as a basic_block_sptr and then dynamic_cast it in the
block xtor. Here's the error I get:
clock_manager_impl.cc: In constructor
'gr::mymodule::clock_manager_impl::clock_manager_impl(gr::basic_block_sptr,
double, const string&)':
clock_manager_impl.cc:50:59: error: cannot dynamic_cast 'usrp' (of type
'gr::basic_block_sptr {aka class boost::shared_ptr<gr::basic_block>}') to type
'gr::uhd::usrp_sink::sptr {aka class boost::shared_ptr<gr::uhd::usrp_sink>}'
(target is not pointer or reference)
d_usrp(dynamic_cast<gr::uhd::usrp_sink::sptr>(usrp)),
Any advice on the best way to do this? Is my approach sane?
Thanks,
Sean
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