usrp3: Added RX DSP support for heterodyne sampling

- rx_dsp_core: set_mux takes in a fe_connection obj
  to determine IQ mapping and sampling mode parameters
- rx_dsp_core: Support a non-zero IF for downconversion
  The current strategy applies a software DSP freq offset
  which eats into the range of the CORDIC which is OK
  because heterodyne assumes real-mode sampling

1 files changed, 1 insertions, 1 deletions

diff --git a/host/lib/usrp/x300/x300_io_impl.cpp b/host/lib/usrp/x300/x300_io_impl.cpp
index 01cbc3ca7..a9fb5d830 100644
--- a/host/lib/usrp/x300/x300_io_impl.cpp
+++ b/host/lib/usrp/x300/x300_io_impl.cpp
@@ -111,7 +111,7 @@ void x300_impl::update_subdev_spec(const std::string &tx_rx, const size_t mb_i,
             //swap condition
             _mb[mb_i].radio_perifs[radio_idx].tx_fe->set_mux(conn);
         } else {
-            _mb[mb_i].radio_perifs[radio_idx].ddc->set_mux(conn);
+            _mb[mb_i].radio_perifs[radio_idx].ddc->set_mux(usrp::fe_connection_t(conn));
             _mb[mb_i].radio_perifs[radio_idx].rx_fe->set_mux(false);
         }
     }