On Thu, 2016-02-04 at 08:32 -0500, discuss-gnuradio-requ...@gnu.org wrote: > In case anyone is interested, I got this to work with code similar to > the following. Note that ?usrp_alias? must be fetched from an already > constructed usrp_sink object, for instance using ?self.usrp.alias()? > in a Python-based flowgraph.
Sean, Ah, interesting. I wrote a "uhd_nmea" block for combined USRP and host clock discipline a few years ago, and ended up using libuhd directly. I didn't have to worry about which block got instantiated first and could just use GRC without editing the generated Python script. I did have to take care that it was the only block performing uhd control of device settings: http://files.ettus.com/manual/page_general.html#general_threading_safety Here's the relevant code on how I used libuhd directly in the OOT block. The ::uhd::device_addr_t type is the same type of argument the usrp_sink and usrp_source blocks use as input: include/my-oot/uhd_nmea.h: class MY_OOT_API uhd_nmea : virtual public gr::block { public: static sptr make(const ::uhd::device_addr_t &uhd_device_addr, ...); } lib/uhd_nmea_impl.h: #include <uhd/usrp/multi_usrp.hpp> class uhd_nmea_impl : public uhd_nmea { private: void open_uhd_device(const ::uhd::device_addr_t &uhd_device_addr); ::uhd::usrp::multi_usrp::sptr d_uhd_dev; ... }; lib/uhd_nmea_impl.cc: uhd_nmea_impl::uhd_nmea_impl(const ::uhd::device_addr_t &uhd_device_addr, ...) : gr::block("uhd_nmea", gr::io_signature::make(0, 0, 0), gr::io_signature::make(0, 0, 0)), .... { open_uhd_device(uhd_device_addr); .... } void uhd_nmea_impl::open_uhd_device(const ::uhd::device_addr_t &uhd_device_addr) { d_uhd_dev = ::uhd::usrp::multi_usrp::make(uhd_device_addr); // 10 MHz reference clock from GPSDO, disable output on rear connector d_uhd_dev->set_clock_source("gpsdo", 0); d_uhd_dev->set_clock_source_out(false, 0); // PPS from GPSDO, enable output on rear connector d_uhd_dev->set_time_source("gpsdo", 0); d_uhd_dev->set_time_source_out(true, 0); } -Andy _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
