1 files changed, 94 insertions, 0 deletions
diff --git a/gr-blocks/lib/check_lfsr_32k_s_impl.h b/gr-blocks/lib/check_lfsr_32k_s_impl.h
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--- /dev/null
+++ b/gr-blocks/lib/check_lfsr_32k_s_impl.h
@@ -0,0 +1,94 @@
+/* -*- 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_GR_CHECK_LFSR_32K_S_IMPL_H
+#define INCLUDED_GR_CHECK_LFSR_32K_S_IMPL_H
+
+#include <blocks/check_lfsr_32k_s.h>
+#include <blocks/lfsr_32k.h>
+
+namespace gr {
+  namespace blocks {
+
+    class check_lfsr_32k_s_impl : public check_lfsr_32k_s
+    {
+    private:
+      enum state {
+        SEARCHING,	// searching for synchronization
+        MATCH0,
+        MATCH1,
+        MATCH2,
+        LOCKED		// is locked
+      };
+
+      state d_state;
+      unsigned int d_history;  // bitmask of decisions
+
+      long d_ntotal;     // total number of shorts
+      long d_nright;     // # of correct shorts
+      long d_runlength;  // # of correct shorts in a row
+
+      static const int BUFSIZE = 2048 - 1;  // ensure pattern isn't packet aligned
+      int d_index;
+      unsigned short d_buffer[BUFSIZE];
+
+      void enter_SEARCHING();
+      void enter_MATCH0();
+      void enter_MATCH1();
+      void enter_MATCH2();
+      void enter_LOCKED();
+
+      void right()
+      {
+        d_history = (d_history << 1) | 0x1;
+        d_nright++;
+        d_runlength++;
+      }
+
+      void wrong()
+      {
+        d_history = (d_history << 1) | 0x0;
+        d_runlength = 0;
+      }
+
+      bool right_three_times() { return (d_history & 0x7) == 0x7; }
+      bool wrong_three_times() { return (d_history & 0x7) == 0x0; }
+
+      void log_error(unsigned short expected, unsigned short actual);
+
+    public:
+      check_lfsr_32k_s_impl();
+      ~check_lfsr_32k_s_impl();
+
+      int work(int noutput_items,
+               gr_vector_const_void_star &input_items,
+               gr_vector_void_star &output_items);
+
+      long ntotal() const { return d_ntotal; }
+      long nright() const { return d_nright; }
+      long runlength() const { return d_runlength; }
+    };
+
+  } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GR_CHECK_LFSR_32K_S_IMPL_H */