1 files changed, 90 insertions, 0 deletions
diff --git a/gr-blocks/include/blocks/lfsr_32k.h b/gr-blocks/include/blocks/lfsr_32k.h
new file mode 100644
index 0000000000..7e70f6512b
--- /dev/null
+++ b/gr-blocks/include/blocks/lfsr_32k.h
@@ -0,0 +1,90 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2004,2013 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.
+ */
+
+#ifndef INCLUDED_GRI_LFSR_32k_H
+#define INCLUDED_GRI_LFSR_32k_H
+
+#include <blocks/api.h>
+#include <blocks/lfsr_15_1_0.h>
+
+namespace gr {
+  namespace blocks {
+
+    /*!
+     * \brief generate pseudo-random sequence of length 32768 bits.
+     * \ingroup misc
+     *
+     * This is based on gri_lfsr_15_1_0 with an extra 0 added at the
+     * end of the sequence.
+     */
+    class BLOCKS_API lfsr_32k
+    {
+    private:
+      lfsr_15_1_0 d_lfsr;
+      unsigned int d_count;
+
+    public:
+      lfsr_32k() { reset (); }
+
+      void reset()
+      {
+        d_lfsr.reset();
+        d_count = 0;
+      }
+
+      int next_bit()
+      {
+        if(d_count == 32767) {
+          d_count = 0;
+          return 0;
+        }
+        d_count++;
+        return d_lfsr.next_bit();
+      }
+
+      int next_byte()
+      {
+        int	v = 0;
+        for(int i = 0; i < 8; i++) {
+          v >>= 1;
+          if(next_bit ())
+            v |= 0x80;
+        }
+        return v;
+      }
+
+      int next_short()
+      {
+        int v = 0;
+        for(int i = 0; i < 16; i++) {
+          v >>= 1;
+          if(next_bit ())
+            v |= 0x8000;
+        }
+        return v;
+      }
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GRI_LFSR_32k_H */