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/* -*- 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);
}
}
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