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/*
* Copyright 2004,2006 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 2, 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 <pager_flex_parse.h>
#include <pageri_bch3221.h>
#include <gr_io_signature.h>
pager_flex_parse_sptr pager_make_flex_parse()
{
return pager_flex_parse_sptr(new pager_flex_parse());
}
pager_flex_parse::pager_flex_parse() :
gr_sync_block("flex_parse",
gr_make_io_signature(1, 1, sizeof(gr_int32)),
gr_make_io_signature(0, 0, 0))
{
d_count = 0;
}
int pager_flex_parse::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const gr_int32 *in = (const gr_int32 *)input_items[0];
int i = 0;
while (i < noutput_items) {
// Accumulate one whole frame's worth of data words (88 of them)
d_datawords[d_count] = *in++; i++;
if (++d_count == 88) {
parse_data();
d_count = 0;
}
}
return i;
}
/* FLEX data frames (that is, 88 data words per phase recovered after sync,
symbol decoding, dephasing, deinterleaving, error correction, and conversion
from codewords to data words) start with a block information word containing
indices of the page address field and page vector fields.
*/
void pager_flex_parse::parse_capcode(gr_int32 aw1, gr_int32 aw2)
{
d_laddr = (aw1 < 0x008001L) ||
(aw1 > 0x1E0000L) ||
(aw1 > 0x1E7FFEL);
if (d_laddr)
d_capcode = aw1+((aw2^0x001FFFFF)<<15)+0x1F9000; // Don't ask
else
d_capcode = aw1-0x8000;
}
void pager_flex_parse::parse_data()
{
// Block information word is the first data word in frame
gr_int32 biw = d_datawords[0];
// Nothing to see here, please move along
if (biw == 0 || biw == 0x001FFFFF)
return;
// Vector start index is bits 15-10
// Address start address is bits 9-8, plus one for offset
int voffset = (biw >> 10) & 0x3f;
int aoffset = ((biw >> 8) & 0x03) + 1;
// printf("BIW=%08X A=%i V=%i\n", biw, aoffset, voffset);
// Iterate through pages and dispatch to appropriate handler
for (int i = aoffset; i < voffset; i++) {
int j = voffset+i-aoffset; // Start of vector field for address @ i
if (d_datawords[i] == 0x00000000 ||
d_datawords[i] == 0x001FFFFF)
continue; // Idle codewords, invalid address
parse_capcode(d_datawords[i], d_datawords[i+1]);
if (d_laddr)
i++;
if (d_capcode < 0) // Invalid address, skip
continue;
// Parse vector information word for address @ offset 'i'
gr_int32 viw = d_datawords[j];
d_type = (page_type_t)((viw >> 4) & 0x00000007);
int mw1 = (viw >> 7) & 0x00000007F;
int len = (viw >> 14) & 0x0000007F;
if (is_numeric_page(d_type))
len &= 0x07;
int mw2 = mw1+len;
if (mw1 == 0 && mw2 == 0)
continue; // Invalid VIW
if (is_tone_page(d_type))
mw1 = mw2 = 0;
if (mw1 > 87 || mw2 > 87)
continue; // Invalid offsets
printf("%09i: ", d_capcode);
if (is_alphanumeric_page(d_type))
parse_alphanumeric(mw1, mw2-1);
else if (is_numeric_page(d_type))
parse_numeric(mw1, mw2);
else if (is_tone_page(d_type))
parse_tone_only();
else
parse_unknown(mw1, mw2);
printf("\n");
}
}
void pager_flex_parse::parse_alphanumeric(int mw1, int mw2)
{
printf("ALPHA");
for (int i = mw1; i < mw2; i++) {
}
}
void pager_flex_parse::parse_numeric(int mw1, int mw2)
{
printf("NUMERIC");
}
void pager_flex_parse::parse_tone_only()
{
printf("TONE");
}
void pager_flex_parse::parse_unknown(int mw1, int mw2)
{
printf("UNKNOWN");
}
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