analog: adding frequency_modulator_fc to gr-analog, with QA and GRC.

1 files changed, 82 insertions, 0 deletions

diff --git a/gr-analog/lib/frequency_modulator_fc_impl.cc b/gr-analog/lib/frequency_modulator_fc_impl.cc
new file mode 100644
index 000000000..2da7ee15f
--- /dev/null
+++ b/gr-analog/lib/frequency_modulator_fc_impl.cc
@@ -0,0 +1,82 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2010-2012 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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, or (at your option)
+ * any later version.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "frequency_modulator_fc_impl.h"
+#include <gr_io_signature.h>
+#include <gr_fxpt.h>
+#include <math.h>
+#include <boost/math/special_functions/trunc.hpp>
+
+namespace gr {
+  namespace analog {
+
+    frequency_modulator_fc::sptr
+    frequency_modulator_fc::make(double sensitivity)
+    {
+      return gnuradio::get_initial_sptr
+	(new frequency_modulator_fc_impl(sensitivity));
+    }
+
+    frequency_modulator_fc_impl::frequency_modulator_fc_impl(double sensitivity)
+      : gr_sync_block("frequency_modulator_fc",
+		      gr_make_io_signature(1, 1, sizeof(float)),
+		      gr_make_io_signature(1, 1, sizeof(gr_complex))),
+	d_sensitivity(sensitivity), d_phase(0)
+    {
+    }
+
+    frequency_modulator_fc_impl::~frequency_modulator_fc_impl()
+    {
+    }
+
+    int
+    frequency_modulator_fc_impl::work(int noutput_items,
+				      gr_vector_const_void_star &input_items,
+				      gr_vector_void_star &output_items)
+    {
+      const float *in = (const float*)input_items[0];
+      gr_complex *out = (gr_complex*)output_items[0];
+
+      for(int i = 0; i < noutput_items; i++) {
+	d_phase = d_phase + d_sensitivity * in[i];
+
+	while(d_phase > (float)(M_PI))
+	  d_phase -= (float)(2.0 * M_PI);
+	while(d_phase < (float)(-M_PI))
+	  d_phase += (float)(2.0 * M_PI);
+
+	float oi, oq;
+
+	gr_int32 angle = gr_fxpt::float_to_fixed (d_phase);
+	gr_fxpt::sincos(angle, &oq, &oi);
+	out[i] = gr_complex(oi, oq);
+      }
+
+      return noutput_items;
+    }
+
+  } /* namespace analog */
+} /* namespace gr */