1 files changed, 90 insertions, 0 deletions
diff --git a/gr-digital/lib/glfsr_source_f_impl.cc b/gr-digital/lib/glfsr_source_f_impl.cc
new file mode 100644
index 0000000000..1e0ee2d85e
--- /dev/null
+++ b/gr-digital/lib/glfsr_source_f_impl.cc
@@ -0,0 +1,90 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2007,2010,2012 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 "glfsr_source_f_impl.h"
+#include <gr_io_signature.h>
+#include <stdexcept>
+
+namespace gr {
+  namespace digital {
+
+    glfsr_source_f::sptr
+    glfsr_source_f::make(int degree, bool repeat, int mask, int seed)
+    {
+      return gnuradio::get_initial_sptr
+	(new glfsr_source_f_impl(degree, repeat, mask, seed));
+    }
+
+    glfsr_source_f_impl::glfsr_source_f_impl(int degree, bool repeat,
+					     int mask, int seed)
+      : gr_sync_block("glfsr_source_f",
+		      gr_make_io_signature(0, 0, 0),
+		      gr_make_io_signature(1, 1, sizeof(float))),
+	d_repeat(repeat), d_index(0)
+    {
+      if(degree < 1 || degree > 32)
+	throw std::runtime_error("glfsr_source_f_impl: degree must be between 1 and 32 inclusive");
+      d_length = (unsigned int)((1ULL << degree)-1);
+
+      if(mask == 0)
+	mask = glfsr::glfsr_mask(degree);
+      d_glfsr = new glfsr(mask, seed);
+    }
+
+    glfsr_source_f_impl::~glfsr_source_f_impl()
+    {
+      delete d_glfsr;
+    }
+
+    int
+    glfsr_source_f_impl::mask() const
+    {
+      return d_glfsr->mask();
+    }
+
+    int
+    glfsr_source_f_impl::work(int noutput_items,
+			      gr_vector_const_void_star &input_items,
+			      gr_vector_void_star &output_items)
+    {
+      float *out = (float *) output_items[0];
+      if((d_index > d_length) && d_repeat == false)
+	return -1; /* once through the sequence */
+
+      int i;
+      for(i = 0; i < noutput_items; i++) {
+	out[i] = (float)d_glfsr->next_bit()*2.0-1.0;
+	d_index++;
+	if(d_index > d_length && d_repeat == false)
+	  break;
+      }
+
+      return i;
+    }
+
+  } /* namespace digital */
+} /* namespace gr */