mg: Enable variable master clock rates

The master_clock_rate argument is passed to init() during
initialization; this change allows to query the correct MCR at
initialization time. It does not allow changing the MCR while a session
is active.

The MCR also affects the LO settings; it is the reference clock for the
lowband LOs.

1 files changed, 5 insertions, 4 deletions

diff --git a/host/lib/usrp/dboard/magnesium/magnesium_radio_ctrl_init.cpp b/host/lib/usrp/dboard/magnesium/magnesium_radio_ctrl_init.cpp
index 27cf926a2..191218133 100644
--- a/host/lib/usrp/dboard/magnesium/magnesium_radio_ctrl_init.cpp
+++ b/host/lib/usrp/dboard/magnesium/magnesium_radio_ctrl_init.cpp
@@ -37,9 +37,8 @@ void magnesium_radio_ctrl_impl::_init_defaults()
     UHD_LOG_TRACE(unique_id(),
             "Num TX chans: " << num_tx_chans
             << " Num RX chans: " << num_rx_chans);
-    UHD_LOG_TRACE(unique_id(),
-            "Setting tick rate to " << MAGNESIUM_TICK_RATE / 1e6 << " MHz");
-    radio_ctrl_impl::set_rate(MAGNESIUM_TICK_RATE);
+    // get_rate() is useless until we can ask MPM for the actual rate
+    radio_ctrl_impl::set_rate(1.0);
 
     for (size_t chan = 0; chan < num_rx_chans; chan++) {
         radio_ctrl_impl::set_rx_frequency(MAGNESIUM_CENTER_FREQ, chan);
@@ -397,7 +396,9 @@ void magnesium_radio_ctrl_impl::_init_prop_tree()
     // TODO remove this dirty hack
     if (not _tree->exists("tick_rate"))
     {
-        _tree->create<double>("tick_rate").set(MAGNESIUM_TICK_RATE);
+        _tree->create<double>("tick_rate")
+            .set_publisher([this](){ return this->get_rate(); })
+        ;
     }
 }