1 files changed, 66 insertions, 0 deletions
diff --git a/host/examples/wavetable.hpp b/host/examples/wavetable.hpp
new file mode 100644
index 000000000..d7ffc8406
--- /dev/null
+++ b/host/examples/wavetable.hpp
@@ -0,0 +1,66 @@
+//
+// Copyright 2010-2012,2014 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <string>
+#include <cmath>
+#include <complex>
+#include <vector>
+#include <stdexcept>
+
+static const size_t wave_table_len = 8192;
+
+class wave_table_class{
+public:
+    wave_table_class(const std::string &wave_type, const float ampl):
+        _wave_table(wave_table_len)
+    {
+        //compute real wave table with 1.0 amplitude
+        std::vector<double> real_wave_table(wave_table_len);
+        if (wave_type == "CONST"){
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = 1.0;
+        }
+        else if (wave_type == "SQUARE"){
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = (i < wave_table_len/2)? 0.0 : 1.0;
+        }
+        else if (wave_type == "RAMP"){
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = 2.0*i/(wave_table_len-1) - 1.0;
+        }
+        else if (wave_type == "SINE"){
+            static const double tau = 2*std::acos(-1.0);
+            for (size_t i = 0; i < wave_table_len; i++)
+                real_wave_table[i] = std::sin((tau*i)/wave_table_len);
+        }
+        else throw std::runtime_error("unknown waveform type: " + wave_type);
+
+        //compute i and q pairs with 90% offset and scale to amplitude
+        for (size_t i = 0; i < wave_table_len; i++){
+            const size_t q = (i+(3*wave_table_len)/4)%wave_table_len;
+            _wave_table[i] = std::complex<float>(ampl*real_wave_table[i], ampl*real_wave_table[q]);
+        }
+    }
+
+    inline std::complex<float> operator()(const size_t index) const{
+        return _wave_table[index % wave_table_len];
+    }
+
+private:
+    std::vector<std::complex<float> > _wave_table;
+};
+