twinrx: Provide power cal ID

Note that the TwinRX has a different behaviour if two or one channel are
enabled. For that reason, TwinRX requires 8 different sets of
calibration data:
- For one vs. two channels
- For channel 0 and channel 1
- For RX1 and RX2

Since every combination of these settings is possible, that results in
2^3 == 8 combinations.

The choice of RX1 vs. RX2 is encoded in the calibration key. The choice
of one vs. two channels is also encoded in the calibration key, and is
derived using an expert node.
Channel 0 and 1 are assumed symmetric, thus, the encoding for those
happens in the calibration serial.

3 files changed, 19 insertions, 0 deletions

diff --git a/host/lib/usrp/dboard/db_twinrx.cpp b/host/lib/usrp/dboard/db_twinrx.cpp
index 258dc95a4..a7c57979d 100644
--- a/host/lib/usrp/dboard/db_twinrx.cpp
+++ b/host/lib/usrp/dboard/db_twinrx.cpp
@@ -195,6 +195,9 @@ public:
             prepend_ch("enabled", _ch_name),
             false,
             AUTO_RESOLVE_ON_WRITE);
+        // ID for cal data lookup. This depends on how many channels are enabled
+        expert_factory::add_prop_node<std::string>(
+            _expert, get_rx_subtree(), "id", prepend_ch("id", _ch_name), "twinrx");
 
         // Readback
         get_rx_subtree()
diff --git a/host/lib/usrp/dboard/twinrx/twinrx_experts.cpp b/host/lib/usrp/dboard/twinrx/twinrx_experts.cpp
index 36bcc1863..d196d99e2 100644
--- a/host/lib/usrp/dboard/twinrx/twinrx_experts.cpp
+++ b/host/lib/usrp/dboard/twinrx/twinrx_experts.cpp
@@ -459,6 +459,15 @@ void twinrx_antenna_expert::resolve()
         throw uhd::value_error(
             "Cannot calibrate channel 1 and export the LO for channel 0.");
     }
+
+    // Set ID for power cal
+    if (_enabled_ch0 and _enabled_ch1) {
+        _id_ch0 = "twinrx2";
+        _id_ch1 = "twinrx2";
+    } else {
+        _id_ch0 = "twinrx";
+        _id_ch1 = "twinrx";
+    }
 }
 
 /*!---------------------------------------------------------
diff --git a/host/lib/usrp/dboard/twinrx/twinrx_experts.hpp b/host/lib/usrp/dboard/twinrx/twinrx_experts.hpp
index c7e021a90..9d2269916 100644
--- a/host/lib/usrp/dboard/twinrx/twinrx_experts.hpp
+++ b/host/lib/usrp/dboard/twinrx/twinrx_experts.hpp
@@ -374,6 +374,8 @@ public:
         , _lo_export_ch1(db, prepend_ch("los/all/export", "1"))
         , _ant_mapping(db, "com/ant_mapping")
         , _cal_mode(db, "com/cal_mode")
+        , _id_ch0(db, prepend_ch("id", "0"))
+        , _id_ch1(db, prepend_ch("id", "1"))
     {
         bind_accessor(_antenna_ch0);
         bind_accessor(_antenna_ch1);
@@ -383,6 +385,8 @@ public:
         bind_accessor(_lo_export_ch1);
         bind_accessor(_ant_mapping);
         bind_accessor(_cal_mode);
+        bind_accessor(_id_ch0);
+        bind_accessor(_id_ch1);
     }
 
 private:
@@ -398,6 +402,9 @@ private:
     // Outputs
     experts::data_writer_t<twinrx_ctrl::antenna_mapping_t> _ant_mapping;
     experts::data_writer_t<twinrx_ctrl::cal_mode_t> _cal_mode;
+
+    experts::data_writer_t<std::string> _id_ch0;
+    experts::data_writer_t<std::string> _id_ch1;
 };
 
 /*!---------------------------------------------------------