mirror of
https://github.com/lwvmobile/dsd-fme.git
synced 2026-11-14 09:47:30 -05:00
f8cd8d715f
Refactored implementation of p25p1_ldu1.c and p25p1_ldu2.c. There are less duplicities now and hopefully is easier to read and maintain. Added a unit test for the Hamming algorithm.
266 lines
8.3 KiB
C
266 lines
8.3 KiB
C
/*
|
|
* Copyright (C) 2010 DSD Author
|
|
* GPG Key ID: 0x3F1D7FD0 (74EF 430D F7F2 0A48 FCE6 F630 FAA2 635D 3F1D 7FD0)
|
|
*
|
|
* Permission to use, copy, modify, and/or distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
|
|
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
|
|
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
|
|
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
|
|
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
|
|
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
* PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include "dsd.h"
|
|
#include "p25p1_const.h"
|
|
|
|
#include "p25p1_ldu.h"
|
|
#include "p25p1_check_ldu.h"
|
|
|
|
|
|
|
|
void
|
|
processLDU1 (dsd_opts* opts, dsd_state* state)
|
|
{
|
|
// extracts IMBE frames from LDU frame
|
|
int i, j, k, dibit;
|
|
char lcformat[9], mfid[9], lcinfo[57];
|
|
char lsd1[9], lsd2[9];
|
|
|
|
int status_count;
|
|
|
|
char hex_data[12][6]; // Data in hex-words (6 bit words). A total of 12 hex words.
|
|
char hex_parity[12][6]; // Parity of the data, again in hex-word format. A total of 12 parity hex words.
|
|
|
|
int irrecoverable_errors;
|
|
|
|
lcformat[8] = 0;
|
|
mfid[8] = 0;
|
|
lcinfo[56] = 0;
|
|
lsd1[8] = 0;
|
|
lsd2[8] = 0;
|
|
|
|
// we skip the status dibits that occur every 36 symbols
|
|
// the first IMBE frame starts 14 symbols before next status
|
|
// so we start counter at 22
|
|
status_count = 21;
|
|
|
|
if (opts->errorbars == 1)
|
|
{
|
|
printf ("e:");
|
|
}
|
|
|
|
// IMBE 1
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// IMBE 2
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// Read data after IMBE 2
|
|
read_and_correct_hex_word (opts, state, &(hex_data[11][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[10][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 9][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 8][0]), &status_count);
|
|
|
|
// IMBE 3
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// Read data after IMBE 3
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 7][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 6][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 5][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 4][0]), &status_count);
|
|
|
|
// IMBE 4
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// Read data after IMBE 4
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 3][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 2][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 1][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_data[ 0][0]), &status_count);
|
|
|
|
// IMBE 5
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// Read data after IMBE 5
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[11][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[10][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 9][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 8][0]), &status_count);
|
|
|
|
// IMBE 6
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// Read data after IMBE 6
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 7][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 6][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 5][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 4][0]), &status_count);
|
|
|
|
// IMBE 7
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// Read data after IMBE 7
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 3][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 2][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 1][0]), &status_count);
|
|
read_and_correct_hex_word (opts, state, &(hex_parity[ 0][0]), &status_count);
|
|
|
|
// IMBE 8
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
// Read data after IMBE 8: LSD (low speed data)
|
|
{
|
|
char lsd[8];
|
|
char cyclic_parity[8];
|
|
|
|
for (i=0; i<=6; i+=2)
|
|
{
|
|
read_dibit(opts, state, lsd+i, &status_count);
|
|
}
|
|
for (i=0; i<=6; i+=2)
|
|
{
|
|
read_dibit(opts, state, cyclic_parity+i, &status_count);
|
|
}
|
|
for (i=0; i<8; i++)
|
|
{
|
|
lsd1[i] = lsd[i] + '0';
|
|
}
|
|
|
|
for (i=0; i<=6; i+=2)
|
|
{
|
|
read_dibit(opts, state, lsd+i, &status_count);
|
|
}
|
|
for (i=0; i<=6; i+=2)
|
|
{
|
|
read_dibit(opts, state, cyclic_parity+i, &status_count);
|
|
}
|
|
for (i=0; i<8; i++)
|
|
{
|
|
lsd2[i] = lsd[i] + '0';
|
|
}
|
|
|
|
// TODO: error correction of the LSD bytes...
|
|
// TODO: do something useful with the LSD bytes...
|
|
}
|
|
|
|
// IMBE 9
|
|
process_IMBE (opts, state, &status_count);
|
|
|
|
if (opts->errorbars == 1)
|
|
{
|
|
printf ("\n");
|
|
}
|
|
|
|
if (opts->p25status == 1)
|
|
{
|
|
printf ("lsd1: %s lsd2: %s\n", lsd1, lsd2);
|
|
}
|
|
|
|
// trailing status symbol
|
|
{
|
|
int status;
|
|
status = getDibit (opts, state) + 48;
|
|
// TODO: do something useful with the status bits...
|
|
}
|
|
|
|
// Error correct the hex_data using Reed-Solomon hex_parity
|
|
irrecoverable_errors = check_and_fix_redsolomon_24_12_13((char*)hex_data, (char*)hex_parity);
|
|
if (irrecoverable_errors == 1) {
|
|
state->debug_header_critical_errors++;
|
|
}
|
|
|
|
|
|
// Put the corrected data into the DSD structures
|
|
lcformat[0] = hex_data[11][0] + '0';
|
|
lcformat[1] = hex_data[11][1] + '0';
|
|
lcformat[2] = hex_data[11][2] + '0';
|
|
lcformat[3] = hex_data[11][3] + '0';
|
|
lcformat[4] = hex_data[11][4] + '0';
|
|
lcformat[5] = hex_data[11][5] + '0';
|
|
|
|
lcformat[6] = hex_data[10][0] + '0';
|
|
lcformat[7] = hex_data[10][1] + '0';
|
|
mfid[0] = hex_data[10][2] + '0';
|
|
mfid[1] = hex_data[10][3] + '0';
|
|
mfid[2] = hex_data[10][4] + '0';
|
|
mfid[3] = hex_data[10][5] + '0';
|
|
|
|
mfid[4] = hex_data[ 9][0] + '0';
|
|
mfid[5] = hex_data[ 9][1] + '0';
|
|
mfid[6] = hex_data[ 9][2] + '0';
|
|
mfid[7] = hex_data[ 9][3] + '0';
|
|
lcinfo[0] = hex_data[ 9][4] + '0';
|
|
lcinfo[1] = hex_data[ 9][5] + '0';
|
|
|
|
lcinfo[2] = hex_data[ 8][0] + '0';
|
|
lcinfo[3] = hex_data[ 8][1] + '0';
|
|
lcinfo[4] = hex_data[ 8][2] + '0';
|
|
lcinfo[5] = hex_data[ 8][3] + '0';
|
|
lcinfo[6] = hex_data[ 8][4] + '0';
|
|
lcinfo[7] = hex_data[ 8][5] + '0';
|
|
|
|
lcinfo[8] = hex_data[ 7][0] + '0';
|
|
lcinfo[9] = hex_data[ 7][1] + '0';
|
|
lcinfo[10] = hex_data[ 7][2] + '0';
|
|
lcinfo[11] = hex_data[ 7][3] + '0';
|
|
lcinfo[12] = hex_data[ 7][4] + '0';
|
|
lcinfo[13] = hex_data[ 7][5] + '0';
|
|
|
|
lcinfo[14] = hex_data[ 6][0] + '0';
|
|
lcinfo[15] = hex_data[ 6][1] + '0';
|
|
lcinfo[16] = hex_data[ 6][2] + '0';
|
|
lcinfo[17] = hex_data[ 6][3] + '0';
|
|
lcinfo[18] = hex_data[ 6][4] + '0';
|
|
lcinfo[19] = hex_data[ 6][5] + '0';
|
|
|
|
lcinfo[20] = hex_data[ 5][0] + '0';
|
|
lcinfo[21] = hex_data[ 5][1] + '0';
|
|
lcinfo[22] = hex_data[ 5][2] + '0';
|
|
lcinfo[23] = hex_data[ 5][3] + '0';
|
|
lcinfo[24] = hex_data[ 5][4] + '0';
|
|
lcinfo[25] = hex_data[ 5][5] + '0';
|
|
|
|
lcinfo[26] = hex_data[ 4][0] + '0';
|
|
lcinfo[27] = hex_data[ 4][1] + '0';
|
|
lcinfo[28] = hex_data[ 4][2] + '0';
|
|
lcinfo[29] = hex_data[ 4][3] + '0';
|
|
lcinfo[30] = hex_data[ 4][4] + '0';
|
|
lcinfo[31] = hex_data[ 4][5] + '0';
|
|
|
|
lcinfo[32] = hex_data[ 3][0] + '0';
|
|
lcinfo[33] = hex_data[ 3][1] + '0';
|
|
lcinfo[34] = hex_data[ 3][2] + '0';
|
|
lcinfo[35] = hex_data[ 3][3] + '0';
|
|
lcinfo[36] = hex_data[ 3][4] + '0';
|
|
lcinfo[37] = hex_data[ 3][5] + '0';
|
|
|
|
lcinfo[38] = hex_data[ 2][0] + '0';
|
|
lcinfo[39] = hex_data[ 2][1] + '0';
|
|
lcinfo[40] = hex_data[ 2][2] + '0';
|
|
lcinfo[41] = hex_data[ 2][3] + '0';
|
|
lcinfo[42] = hex_data[ 2][4] + '0';
|
|
lcinfo[43] = hex_data[ 2][5] + '0';
|
|
|
|
lcinfo[44] = hex_data[ 1][0] + '0';
|
|
lcinfo[45] = hex_data[ 1][1] + '0';
|
|
lcinfo[46] = hex_data[ 1][2] + '0';
|
|
lcinfo[47] = hex_data[ 1][3] + '0';
|
|
lcinfo[48] = hex_data[ 1][4] + '0';
|
|
lcinfo[49] = hex_data[ 1][5] + '0';
|
|
|
|
lcinfo[50] = hex_data[ 0][0] + '0';
|
|
lcinfo[51] = hex_data[ 0][1] + '0';
|
|
lcinfo[52] = hex_data[ 0][2] + '0';
|
|
lcinfo[53] = hex_data[ 0][3] + '0';
|
|
lcinfo[54] = hex_data[ 0][4] + '0';
|
|
lcinfo[55] = hex_data[ 0][5] + '0';
|
|
|
|
processP25lcw (opts, state, lcformat, mfid, lcinfo);
|
|
}
|