1 files changed, 77 insertions, 0 deletions
diff --git a/gr-noaa/lib/noaa_hrpt_decoder.cc b/gr-noaa/lib/noaa_hrpt_decoder.cc
new file mode 100644
index 000000000..8cfaa913c
--- /dev/null
+++ b/gr-noaa/lib/noaa_hrpt_decoder.cc
@@ -0,0 +1,77 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 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 <noaa_hrpt_decoder.h>
+#include <gr_io_signature.h>
+
+#define SYNC1 0x0284
+#define SYNC2 0x016F
+#define SYNC3 0x035C
+#define SYNC4 0x019D
+#define SYNC5 0x020F
+#define SYNC6 0x0095
+
+noaa_hrpt_decoder_sptr
+noaa_make_hrpt_decoder()
+{
+  return gnuradio::get_initial_sptr(new noaa_hrpt_decoder());
+}
+
+noaa_hrpt_decoder::noaa_hrpt_decoder()
+  : gr_sync_block("noaa_hrpt_decoder",
+		  gr_make_io_signature(1, 1, sizeof(short)),
+		  gr_make_io_signature(0, 0, 0))
+{
+  d_word_count = 0;
+}
+
+int
+noaa_hrpt_decoder::work(int noutput_items,
+			gr_vector_const_void_star &input_items,
+			gr_vector_void_star &output_items)
+{
+  const unsigned short *in = (const unsigned short*)input_items[0];
+
+  int i = 0;
+  while (i < noutput_items) {
+    unsigned short word = in[i++];
+    d_word_count++;
+    //fprintf(stderr, "%5u:  ", d_word_count);
+    for (int pos = 0; pos < 10; pos++) {
+      char ch = (word & (1 << 9)) ? '1' : '0';
+      word = word << 1;
+      //fprintf(stderr, "%c ", ch);
+    }
+    //fprintf(stderr, "\n");
+
+    if (d_word_count == 11090) {
+      d_word_count = 0;
+      //fprintf(stderr, "\n");
+    }
+  }
+
+  return i;
+}