uhd: math: Add interpolation.hpp

- Moves linear_interp from cal to utils
- Moves the interp_mode enum class to interpolation.hpp
- Adds three interpolation methods for maps: at_interpolate_1d(),
  at_nearest(), at_lin_interp()
- Adds unit tests

2 files changed, 6 insertions, 4 deletions

diff --git a/host/lib/cal/cal_python.hpp b/host/lib/cal/cal_python.hpp
index 39a13d94c..e8f19eef9 100644
--- a/host/lib/cal/cal_python.hpp
+++ b/host/lib/cal/cal_python.hpp
@@ -8,8 +8,8 @@
 #define INCLUDED_UHD_CAL_PYTHON_HPP
 
 #include <uhd/cal/database.hpp>
-#include <uhd/cal/interpolation.hpp>
 #include <uhd/cal/iq_cal.hpp>
+#include <uhd/utils/interpolation.hpp>
 
 std::vector<uint8_t> pybytes_to_vector(const py::bytes& data)
 {
@@ -59,9 +59,9 @@ void export_cal(py::module& m)
                 database::write_cal_data(key, serial, pybytes_to_vector(data));
             });
 
-    py::enum_<interp_mode>(m, "interp_mode")
-        .value("NEAREST_NEIGHBOR", interp_mode::NEAREST_NEIGHBOR)
-        .value("LINEAR", interp_mode::LINEAR);
+    py::enum_<uhd::math::interp_mode>(m, "interp_mode")
+        .value("NEAREST_NEIGHBOR", uhd::math::interp_mode::NEAREST_NEIGHBOR)
+        .value("LINEAR", uhd::math::interp_mode::LINEAR);
 
     py::class_<container, std::shared_ptr<container>>(m, "container")
         .def("get_name", &container::get_name)
diff --git a/host/lib/cal/iq_cal.cpp b/host/lib/cal/iq_cal.cpp
index e1ed8c9cb..f5640b01e 100644
--- a/host/lib/cal/iq_cal.cpp
+++ b/host/lib/cal/iq_cal.cpp
@@ -8,10 +8,12 @@
 #include <uhd/cal/iq_cal_generated.h>
 #include <uhd/exception.hpp>
 #include <uhd/utils/math.hpp>
+#include <uhdlib/utils/interpolation.hpp>
 #include <map>
 #include <string>
 
 using namespace uhd::usrp::cal;
+using namespace uhd::math;
 
 constexpr int VERSION_MAJOR = 1;
 constexpr int VERSION_MINOR = 0;