X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=gr-noaa%2Flib%2Fnoaa_hrpt_decoder.cc;fp=gr-noaa%2Flib%2Fnoaa_hrpt_decoder.cc;h=24331008910748ea0016c60aa210e2ba7e1714a3;hb=8a9ddbb0675f9bfcc6e03b457fba6c79474a3693;hp=0000000000000000000000000000000000000000;hpb=82d471b9b4a8b389b5da44b19c69c36420828382;p=debian%2Fgnuradio

diff --git a/gr-noaa/lib/noaa_hrpt_decoder.cc b/gr-noaa/lib/noaa_hrpt_decoder.cc
new file mode 100644
index 00000000..24331008
--- /dev/null
+++ b/gr-noaa/lib/noaa_hrpt_decoder.cc
@@ -0,0 +1,200 @@
+/* -*- 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 <noaa_hrpt.h>
+#include <gr_io_signature.h>
+#include <cstdio>
+
+static const char *hrpt_ids[] = {
+  "000000",
+  "NOAA11",
+  "000002",
+  "NOAA16",
+  "000004",
+  "000005",
+  "000006",
+  "NOAA15",
+  "000008",
+  "NOAA12",
+  "000010",
+  "NOAA17",
+  "000012",
+  "NOAA18",
+  "000014",
+  "NOAA19"
+};
+
+noaa_hrpt_decoder_sptr
+noaa_make_hrpt_decoder(bool verbose, bool output_files)
+{
+  return gnuradio::get_initial_sptr(new noaa_hrpt_decoder(verbose, output_files));
+}
+
+noaa_hrpt_decoder::noaa_hrpt_decoder(bool verbose, bool output_files)
+  : gr_sync_block("noaa_hrpt_decoder",
+		  gr_make_io_signature(1, 1, sizeof(short)),
+		  gr_make_io_signature(0, 0, 0)),
+    d_verbose(verbose),
+    d_output_files(output_files),
+    d_word_num(0),
+    d_frames_seen(0),
+    d_current_mfnum(0),
+    d_expected_mfnum(0),
+    d_seq_errs(0),
+    d_address(0),
+    d_day_of_year(0),
+    d_milliseconds(0),
+    d_last_time(0)
+{
+  // Start of capture processing here
+}
+
+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) {
+    d_current_word = in[i++] & 0x3FF;
+    d_word_num++;
+
+    // Per HRPT word processing here
+
+    switch (d_word_num) {
+    case 7:
+      process_mfnum();
+      process_address();
+      break;
+
+    case 9:
+      process_day_of_year();
+      break;
+
+    case 10:
+      process_milli1();
+      break;
+
+    case 11:
+      process_milli2();
+      break;
+
+    case 12:
+      process_milli3();
+      break;
+
+    default:
+      break;
+    }
+
+    if (d_word_num == HRPT_MINOR_FRAME_WORDS) {
+
+      // End of minor frame processing here
+      d_frames_seen++;
+      d_word_num = 0;
+      fprintf(stderr, "\n");
+    }
+  }
+
+  return i;
+}
+
+void
+noaa_hrpt_decoder::process_mfnum()
+{
+  d_current_mfnum = (d_current_word & 0x180) >> 7;
+
+  if (d_verbose)
+    fprintf(stderr, "MF:");
+
+  if (d_current_mfnum != d_expected_mfnum && d_frames_seen > 0) {
+    d_seq_errs++;
+
+    if (d_verbose)
+      fprintf(stderr, "*");
+  }
+  else
+    if (d_verbose)
+      fprintf(stderr, " ");
+  
+  if (d_verbose)
+    fprintf(stderr, "%i  ", d_current_mfnum);
+  d_expected_mfnum = (d_current_mfnum == 3) ? 1 : d_current_mfnum+1;
+}
+
+void
+noaa_hrpt_decoder::process_address()
+{
+  d_address = ((d_current_word & 0x078) >> 3) & 0x000F;
+
+  if (d_verbose)
+    fprintf(stderr, "SA: %s  ", hrpt_ids[d_address]);
+}
+
+void
+noaa_hrpt_decoder::process_day_of_year()
+{
+  d_day_of_year = d_current_word >> 1;
+
+  if (d_verbose)
+    fprintf(stderr, "DOY: %3i  ", d_day_of_year);
+}
+
+void
+noaa_hrpt_decoder::process_milli1()
+{
+  d_milliseconds = (d_current_word & 0x7F) << 20;
+}
+
+void
+noaa_hrpt_decoder::process_milli2()
+{
+  d_milliseconds |= (d_current_word << 10);
+}
+
+void
+noaa_hrpt_decoder::process_milli3()
+{
+  d_milliseconds |= d_current_word;
+  int delta = d_milliseconds - d_last_time;
+  d_last_time = d_milliseconds;
+
+  if (d_verbose)
+    fprintf(stderr, "MS: %8i  DT: %8i", d_milliseconds, delta);
+}
+
+noaa_hrpt_decoder::~noaa_hrpt_decoder()
+{
+  // End of capture processing here
+
+  if (d_verbose) {
+    fprintf(stderr, "Frames seen:     %10i\n", d_frames_seen);
+    fprintf(stderr, "Sequence errors: %10i\n", d_seq_errs);
+  }
+}