mpm: ad937x: Add LO lock API

Reviewed-By: Steven Bingler <steven.bingler@ni.com>
Reviewed-By: Trung Tran <trung.tran@ettus.com>

mpm/include/mpm/ad937x/ad937x_ctrl.hpp

@@ -238,6 +238,15 @@ public:
      */
     virtual double get_freq(const std::string &which) = 0;
 
+    /*! \brief Returns the LO lock status
+     *
+     * Note there's only one LO per direction, so the channel doesn't really
+     * matter here.
+     * This does not check the PLL lock status for the main clock, the sniffer,
+     * or the CAL PLL.
+     */
+    virtual bool get_lo_locked(const std::string &which) = 0;
+
     //! set the FIR filter for the frontend which
     virtual void set_fir(const std::string &which, int8_t gain, const std::vector<int16_t> & fir) = 0;
 
@@ -300,6 +309,7 @@ void export_mykonos(){
         .def("enable_channel", &ad937x_ctrl::enable_channel)
         .def("set_freq", &ad937x_ctrl::set_freq)
         .def("get_freq", &ad937x_ctrl::get_freq)
+        .def("get_lo_locked", &ad937x_ctrl::get_lo_locked)
         .def("set_fir", &ad937x_ctrl::set_fir)
         .def("get_fir", &ad937x_ctrl::get_fir)
         .def("get_temperature", &ad937x_ctrl::get_temperature)

mpm/lib/mykonos/ad937x_ctrl.cpp

@@ -417,6 +417,17 @@ public:
         return device.get_freq(dir);
     }
 
+    virtual bool get_lo_locked(const std::string &which)
+    {
+        const auto dir = _get_direction_from_antenna(which);
+        const uint8_t pll_select = (dir == uhd::RX_DIRECTION) ?
+            ad937x_device::RX_SYNTH :
+            ad937x_device::TX_SYNTH;
+
+        std::lock_guard<std::mutex> lock(*spi_mutex);
+        return device.get_pll_lock_status(pll_select);
+    }
+
     virtual void set_fir(const std::string &which, int8_t gain, const std::vector<int16_t> & fir)
     {
         auto dir = _get_direction_from_antenna(which);