kopia lustrzana https://github.com/rs1729/RS
1059 wiersze
28 KiB
C
1059 wiersze
28 KiB
C
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/*
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* LMS6
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* (403 MHz)
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*
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* sync header: correlation/matched filter
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* files: lms6mod.c demod_mod.c demod_mod.h bch_ecc_mod.c bch_ecc_mod.h
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* compile, either (a) or (b):
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* (a)
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* gcc -c demod_mod.c
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* gcc -DINCLUDESTATIC lms6mod.c demod_mod.o -lm -o lms6mod
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* (b)
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* gcc -c demod_mod.c
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* gcc -c bch_ecc_mod.c
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* gcc lms6mod.c demod_mod.o bch_ecc_mod.o -lm -o lms6mod
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*
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* usage:
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* ./lms6mod --vit --ecc <audio.wav>
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* ( --vit recommended)
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* author: zilog80
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#ifdef CYGWIN
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#include <fcntl.h> // cygwin: _setmode()
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#include <io.h>
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#endif
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//typedef unsigned char ui8_t;
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//typedef unsigned short ui16_t;
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//typedef unsigned int ui32_t;
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#include "demod_mod.h"
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//#define INCLUDESTATIC 1
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#ifdef INCLUDESTATIC
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#include "bch_ecc_mod.c"
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#else
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#include "bch_ecc_mod.h"
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#endif
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typedef struct {
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i8_t vbs; // verbose output
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i8_t raw; // raw frames
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i8_t crc; // CRC check output
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i8_t ecc; // Reed-Solomon ECC
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i8_t sat; // GPS sat data
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i8_t ptu; // PTU: temperature
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i8_t inv;
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i8_t vit;
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i8_t jsn; // JSON output (auto_rx)
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} option_t;
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/* -------------------------------------------------------------------------- */
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#define BAUD_RATE 4800
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#define BITS 8
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#define HEADOFS 0 //16
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#define HEADLEN ((4*16)-HEADOFS)
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#define SYNC_LEN 5
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#define FRM_LEN (223)
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#define PAR_LEN (32)
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#define FRMBUF_LEN (3*FRM_LEN)
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#define BLOCKSTART (SYNC_LEN*BITS*2)
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#define BLOCK_LEN (FRM_LEN+PAR_LEN+SYNC_LEN) // 255+5 = 260
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#define RAWBITBLOCK_LEN ((BLOCK_LEN+1)*BITS*2) // (+1 tail)
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#define FRAME_LEN (300) // 4800baud, 16bits/byte
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#define BITFRAME_LEN (FRAME_LEN*BITS)
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#define RAWBITFRAME_LEN (BITFRAME_LEN*2)
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#define OVERLAP 64
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#define OFS 4
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static char rawheader[] = "0101011000001000""0001110010010111""0001101010100111""0011110100111110"; // (c0,inv(c1))
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// (00) 58 f3 3f b8
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// char header[] = "0000001101011101""0100100111000010""0100111111110010""0110100001101011"; // (c0,c1)
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static ui8_t rs_sync[] = { 0x00, 0x58, 0xf3, 0x3f, 0xb8};
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// 0x58f33fb8 little-endian <-> 0x1ACFFC1D big-endian bytes
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// (00) 58 f3 3f b8
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static char blk_syncbits[] = "0000000000000000""0000001101011101""0100100111000010""0100111111110010""0110100001101011";
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static ui8_t frm_sync[] = { 0x24, 0x54, 0x00, 0x00};
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#define L 7 // d_f=10
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static char polyA[] = "1001111"; // 0x4f: x^6+x^3+x^2+x+1
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static char polyB[] = "1101101"; // 0x6d: x^6+x^5+x^3+x^2+1
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/*
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// d_f=6
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qA[] = "1110011"; // 0x73: x^6+x^5+x^4+x+1
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qB[] = "0011110"; // 0x1e: x^4+x^3+x^2+x
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pA[] = "10010101"; // 0x95: x^7+x^4+x^2+1 = (x+1)(x^6+x^5+x^4+x+1) = (x+1)qA
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pB[] = "00100010"; // 0x22: x^5+x = (x+1)(x^4+x^3+x^2+x)=x(x+1)^3 = (x+1)qB
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polyA = qA + x*qB
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polyB = qA + qB
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*/
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#define N (1 << L)
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#define M (1 << (L-1))
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typedef struct {
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ui8_t bIn;
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ui8_t codeIn;
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ui8_t prevState; // 0..M=64
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int w; // > 255 : if (w>250): w=250 ?
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//float sw;
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} states_t;
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typedef struct {
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char rawbits[RAWBITFRAME_LEN+OVERLAP*BITS*2 +8];
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states_t state[RAWBITFRAME_LEN+OVERLAP +8][M];
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states_t d[N];
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} VIT_t;
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typedef struct {
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int frnr;
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int sn;
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int week; int gpstow; int gpssec;
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int jahr; int monat; int tag;
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int wday;
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int std; int min; float sek;
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double lat; double lon; double alt;
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double vH; double vD; double vV;
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double vE; double vN; double vU;
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char blk_rawbits[RAWBITBLOCK_LEN+SYNC_LEN*BITS*2 +8];
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ui8_t frame[FRM_LEN]; // = { 0x24, 0x54, 0x00, 0x00}; // dataheader
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int frm_pos; // ecc_blk <-> frm_blk
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int sf;
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option_t option;
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RS_t RS;
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VIT_t *vit;
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} gpx_t;
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/* ------------------------------------------------------------------------------------ */
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static int gpstow_start = -1;
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static double time_elapsed_sec = 0.0;
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/*
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* Convert GPS Week and Seconds to Modified Julian Day.
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* - Adapted from sci.astro FAQ.
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* - Ignores UTC leap seconds.
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*/
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// in : week, gpssec
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// out: jahr, monat, tag
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static void Gps2Date(gpx_t *gpx) {
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long GpsDays, Mjd;
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long _J, _C, _Y, _M;
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GpsDays = gpx->week * 7 + (gpx->gpssec / 86400);
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Mjd = 44244 + GpsDays;
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_J = Mjd + 2468570;
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_C = 4 * _J / 146097;
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_J = _J - (146097 * _C + 3) / 4;
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_Y = 4000 * (_J + 1) / 1461001;
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_J = _J - 1461 * _Y / 4 + 31;
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_M = 80 * _J / 2447;
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gpx->tag = _J - 2447 * _M / 80;
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_J = _M / 11;
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gpx->monat = _M + 2 - (12 * _J);
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gpx->jahr = 100 * (_C - 49) + _Y + _J;
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}
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/* ------------------------------------------------------------------------------------ */
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// ------------------------------------------------------------------------
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static ui8_t vit_code[N];
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static vitCodes_init = 0;
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static int vit_initCodes(gpx_t *gpx) {
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int cA, cB;
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int i, bits;
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VIT_t *pv = calloc(1, sizeof(VIT_t));
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if (pv == NULL) return -1;
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gpx->vit = pv;
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if ( vitCodes_init == 0 ) {
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for (bits = 0; bits < N; bits++) {
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cA = 0;
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cB = 0;
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for (i = 0; i < L; i++) {
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cA ^= (polyA[L-1-i]&1) & ((bits >> i)&1);
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cB ^= (polyB[L-1-i]&1) & ((bits >> i)&1);
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}
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vit_code[bits] = (cA<<1) | cB;
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}
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vitCodes_init = 1;
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}
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return 0;
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}
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static int vit_dist(int c, char *rc) {
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return (((c>>1)^rc[0])&1) + ((c^rc[1])&1);
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}
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static int vit_start(VIT_t *vit, char *rc) {
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int t, m, j, c, d;
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t = L-1;
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m = M;
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while ( t > 0 ) { // t=0..L-2: nextState<M
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for (j = 0; j < m; j++) {
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vit->state[t][j].prevState = j/2;
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}
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t--;
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m /= 2;
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}
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m = 2;
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for (t = 1; t < L; t++) {
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for (j = 0; j < m; j++) {
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c = vit_code[j];
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vit->state[t][j].bIn = j % 2;
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vit->state[t][j].codeIn = c;
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d = vit_dist( c, rc+2*(t-1) );
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vit->state[t][j].w = vit->state[t-1][vit->state[t][j].prevState].w + d;
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}
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m *= 2;
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}
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return t;
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}
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static int vit_next(VIT_t *vit, int t, char *rc) {
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int b, nstate;
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int j, index;
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for (j = 0; j < M; j++) {
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for (b = 0; b < 2; b++) {
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nstate = j*2 + b;
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vit->d[nstate].bIn = b;
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vit->d[nstate].codeIn = vit_code[nstate];
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vit->d[nstate].prevState = j;
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vit->d[nstate].w = vit->state[t][j].w + vit_dist( vit->d[nstate].codeIn, rc );
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}
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}
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for (j = 0; j < M; j++) {
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if ( vit->d[j].w <= vit->d[j+M].w ) index = j; else index = j+M;
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vit->state[t+1][j] = vit->d[index];
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}
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return 0;
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}
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static int vit_path(VIT_t *vit, int j, int t) {
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int c;
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vit->rawbits[2*t] = '\0';
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while (t > 0) {
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c = vit->state[t][j].codeIn;
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vit->rawbits[2*t -2] = 0x30 + ((c>>1) & 1);
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vit->rawbits[2*t -1] = 0x30 + (c & 1);
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j = vit->state[t][j].prevState;
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t--;
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}
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return 0;
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}
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static int viterbi(VIT_t *vit, char *rc) {
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int t, tmax;
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int j, j_min, w_min;
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vit_start(vit, rc);
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tmax = strlen(rc)/2;
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for (t = L-1; t < tmax; t++)
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{
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vit_next(vit, t, rc+2*t);
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}
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w_min = -1;
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for (j = 0; j < M; j++) {
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if (w_min < 0) {
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w_min = vit->state[tmax][j].w;
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j_min = j;
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}
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if (vit->state[tmax][j].w < w_min) {
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w_min = vit->state[tmax][j].w;
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j_min = j;
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}
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}
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vit_path(vit, j_min, tmax);
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return 0;
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}
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// ------------------------------------------------------------------------
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static int deconv(char* rawbits, char *bits) {
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int j, n, bitA, bitB;
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char *p;
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int len;
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int errors = 0;
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int m = L-1;
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len = strlen(rawbits);
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for (j = 0; j < m; j++) bits[j] = '0';
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n = 0;
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while ( 2*(m+n) < len ) {
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p = rawbits+2*(m+n);
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bitA = bitB = 0;
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for (j = 0; j < m; j++) {
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bitA ^= (bits[n+j]&1) & (polyA[j]&1);
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bitB ^= (bits[n+j]&1) & (polyB[j]&1);
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}
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if ( (bitA^(p[0]&1))==(polyA[m]&1) && (bitB^(p[1]&1))==(polyB[m]&1) ) bits[n+m] = '1';
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else if ( (bitA^(p[0]&1))==0 && (bitB^(p[1]&1))==0 ) bits[n+m] = '0';
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else {
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if ( (bitA^(p[0]&1))!=(polyA[m]&1) && (bitB^(p[1]&1))==(polyB[m]&1) ) bits[n+m] = 0x39;
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else bits[n+m] = 0x38;
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errors = n;
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break;
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}
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n += 1;
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}
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bits[n+m] = '\0';
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return errors;
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}
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// ------------------------------------------------------------------------
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static int crc16_0(ui8_t frame[], int len) {
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int crc16poly = 0x1021;
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int rem = 0x0, i, j;
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int byte;
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for (i = 0; i < len; i++) {
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byte = frame[i];
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rem = rem ^ (byte << 8);
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for (j = 0; j < 8; j++) {
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if (rem & 0x8000) {
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rem = (rem << 1) ^ crc16poly;
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}
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else {
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rem = (rem << 1);
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}
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rem &= 0xFFFF;
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}
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}
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return rem;
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}
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static int check_CRC(ui8_t frame[]) {
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ui32_t crclen = 0,
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crcdat = 0;
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crclen = 221;
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crcdat = (frame[crclen]<<8) | frame[crclen+1];
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if ( crcdat != crc16_0(frame, crclen) ) {
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return 1; // CRC NO
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}
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else return 0; // CRC OK
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}
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// ------------------------------------------------------------------------
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static int bits2bytes(char *bitstr, ui8_t *bytes) {
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int i, bit, d, byteval;
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int len = strlen(bitstr)/8;
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int bitpos, bytepos;
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bitpos = 0;
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bytepos = 0;
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while (bytepos < len) {
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byteval = 0;
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d = 1;
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for (i = 0; i < BITS; i++) {
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bit=*(bitstr+bitpos+i); /* little endian */
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//bit=*(bitstr+bitpos+7-i); /* big endian */
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if ((bit == '1') || (bit == '9')) byteval += d;
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else /*if ((bit == '0') || (bit == '8'))*/ byteval += 0;
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d <<= 1;
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}
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bitpos += BITS;
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bytes[bytepos++] = byteval & 0xFF;
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}
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//while (bytepos < FRAME_LEN+OVERLAP) bytes[bytepos++] = 0;
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return bytepos;
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}
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/* -------------------------------------------------------------------------- */
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#define pos_SondeSN (OFS+0x00) // ?4 byte 00 7A....
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#define pos_FrameNb (OFS+0x04) // 2 byte
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//GPS Position
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#define pos_GPSTOW (OFS+0x06) // 4 byte
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#define pos_GPSlat (OFS+0x0E) // 4 byte
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#define pos_GPSlon (OFS+0x12) // 4 byte
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#define pos_GPSalt (OFS+0x16) // 4 byte
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//GPS Velocity East-North-Up (ENU)
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#define pos_GPSvO (OFS+0x1A) // 3 byte
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#define pos_GPSvN (OFS+0x1D) // 3 byte
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#define pos_GPSvV (OFS+0x20) // 3 byte
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static int get_SondeSN(gpx_t *gpx) {
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unsigned byte;
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byte = (gpx->frame[pos_SondeSN]<<24) | (gpx->frame[pos_SondeSN+1]<<16)
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| (gpx->frame[pos_SondeSN+2]<<8) | gpx->frame[pos_SondeSN+3];
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gpx->sn = byte & 0xFFFFFF;
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return 0;
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}
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static int get_FrameNb(gpx_t *gpx) {
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int i;
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unsigned byte;
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ui8_t frnr_bytes[2];
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int frnr;
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for (i = 0; i < 2; i++) {
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byte = gpx->frame[pos_FrameNb + i];
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frnr_bytes[i] = byte;
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}
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frnr = (frnr_bytes[0] << 8) + frnr_bytes[1] ;
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gpx->frnr = frnr;
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return 0;
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}
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//char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"};
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static char weekday[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
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static int get_GPStime(gpx_t *gpx, int crc_err) {
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int i;
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unsigned byte;
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ui8_t gpstime_bytes[4];
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int gpstime = 0, // 32bit
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day;
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float ms;
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for (i = 0; i < 4; i++) {
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byte = gpx->frame[pos_GPSTOW + i];
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gpstime_bytes[i] = byte;
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}
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gpstime = 0;
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for (i = 0; i < 4; i++) {
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gpstime |= gpstime_bytes[i] << (8*(3-i));
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}
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if (gpstow_start < 0 && !crc_err) {
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gpstow_start = gpstime; // time elapsed since start-up?
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if (gpx->week > 0 && gpstime/1000.0 < time_elapsed_sec) gpx->week += 1;
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}
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gpx->gpstow = gpstime;
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ms = gpstime % 1000;
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gpstime /= 1000;
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gpx->gpssec = gpstime;
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day = gpstime / (24 * 3600);
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gpstime %= (24*3600);
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if ((day < 0) || (day > 6)) return -1;
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gpx->wday = day;
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gpx->std = gpstime / 3600;
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gpx->min = (gpstime % 3600) / 60;
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gpx->sek = gpstime % 60 + ms/1000.0;
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return 0;
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}
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static double B60B60 = (1<<30)/90.0; // 2^32/360 = 2^30/90 = 0xB60B60.711x
|
|
|
|
static int get_GPSlat(gpx_t *gpx) {
|
|
int i;
|
|
unsigned byte;
|
|
ui8_t gpslat_bytes[4];
|
|
int gpslat;
|
|
double lat;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
byte = gpx->frame[pos_GPSlat + i];
|
|
gpslat_bytes[i] = byte;
|
|
}
|
|
|
|
gpslat = 0;
|
|
for (i = 0; i < 4; i++) {
|
|
gpslat |= gpslat_bytes[i] << (8*(3-i));
|
|
}
|
|
lat = gpslat / B60B60;
|
|
gpx->lat = lat;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_GPSlon(gpx_t *gpx) {
|
|
int i;
|
|
unsigned byte;
|
|
ui8_t gpslon_bytes[4];
|
|
int gpslon;
|
|
double lon;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
byte = gpx->frame[pos_GPSlon + i];
|
|
gpslon_bytes[i] = byte;
|
|
}
|
|
|
|
gpslon = 0;
|
|
for (i = 0; i < 4; i++) {
|
|
gpslon |= gpslon_bytes[i] << (8*(3-i));
|
|
}
|
|
lon = gpslon / B60B60;
|
|
gpx->lon = lon;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int get_GPSalt(gpx_t *gpx) {
|
|
int i;
|
|
unsigned byte;
|
|
ui8_t gpsheight_bytes[4];
|
|
int gpsheight;
|
|
double height;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
byte = gpx->frame[pos_GPSalt + i];
|
|
gpsheight_bytes[i] = byte;
|
|
}
|
|
|
|
gpsheight = 0;
|
|
for (i = 0; i < 4; i++) {
|
|
gpsheight |= gpsheight_bytes[i] << (8*(3-i));
|
|
}
|
|
height = gpsheight / 1000.0;
|
|
gpx->alt = height;
|
|
|
|
if (height < -200 || height > 60000) return -1;
|
|
return 0;
|
|
}
|
|
|
|
static int get_GPSvel24(gpx_t *gpx) {
|
|
int i;
|
|
unsigned byte;
|
|
ui8_t gpsVel_bytes[3];
|
|
int vel24;
|
|
double vx, vy, vz, dir; //, alpha;
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
byte = gpx->frame[pos_GPSvO + i];
|
|
gpsVel_bytes[i] = byte;
|
|
}
|
|
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
|
|
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
|
|
vx = vel24 / 1e3; // ost
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
byte = gpx->frame[pos_GPSvN + i];
|
|
gpsVel_bytes[i] = byte;
|
|
}
|
|
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
|
|
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
|
|
vy= vel24 / 1e3; // nord
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
byte = gpx->frame[pos_GPSvV + i];
|
|
gpsVel_bytes[i] = byte;
|
|
}
|
|
vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
|
|
if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
|
|
vz = vel24 / 1e3; // hoch
|
|
|
|
gpx->vE = vx;
|
|
gpx->vN = vy;
|
|
gpx->vU = vz;
|
|
|
|
|
|
gpx->vH = sqrt(vx*vx+vy*vy);
|
|
/*
|
|
alpha = atan2(vy, vx)*180/M_PI; // ComplexPlane (von x-Achse nach links) - GeoMeteo (von y-Achse nach rechts)
|
|
dir = 90-alpha; // z=x+iy= -> i*conj(z)=y+ix=re(i(pi/2-t)), Achsen und Drehsinn vertauscht
|
|
if (dir < 0) dir += 360; // atan2(y,x)=atan(y/x)=pi/2-atan(x/y) , atan(1/t) = pi/2 - atan(t)
|
|
gpx->vD2 = dir;
|
|
*/
|
|
dir = atan2(vx, vy) * 180 / M_PI;
|
|
if (dir < 0) dir += 360;
|
|
gpx->vD = dir;
|
|
|
|
gpx->vV = vz;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
// RS(255,223)-CCSDS
|
|
#define rs_N 255
|
|
#define rs_K 223
|
|
#define rs_R (rs_N-rs_K) // 32
|
|
|
|
static int lms6_ecc(gpx_t *gpx, ui8_t *cw) {
|
|
int errors;
|
|
ui8_t err_pos[rs_R],
|
|
err_val[rs_R];
|
|
|
|
errors = rs_decode(&gpx->RS, cw, err_pos, err_val);
|
|
|
|
return errors;
|
|
}
|
|
|
|
static void print_frame(gpx_t *gpx, int crc_err, int len) {
|
|
int err=0;
|
|
|
|
if (gpx->frame[0] != 0)
|
|
{
|
|
//if ((gpx->frame[pos_SondeSN+1] & 0xF0) == 0x70) // ? beginnen alle SNs mit 0x7A.... bzw 80..... ?
|
|
if ( gpx->frame[pos_SondeSN+1] )
|
|
{
|
|
get_SondeSN(gpx);
|
|
get_FrameNb(gpx);
|
|
printf(" (%7d) ", gpx->sn);
|
|
printf(" [%5d] ", gpx->frnr);
|
|
err = get_GPStime(gpx, crc_err);
|
|
if (!err) printf("%s ", weekday[gpx->wday]);
|
|
if (gpx->week > 0) {
|
|
if (gpx->gpstow < gpstow_start && !crc_err) {
|
|
gpx->week += 1; // week roll-over
|
|
gpstow_start = gpx->gpstow;
|
|
}
|
|
Gps2Date(gpx);
|
|
fprintf(stdout, "%04d-%02d-%02d ", gpx->jahr, gpx->monat, gpx->tag);
|
|
}
|
|
printf("%02d:%02d:%06.3f ", gpx->std, gpx->min, gpx->sek); // falls Rundung auf 60s: Ueberlauf
|
|
|
|
get_GPSlat(gpx);
|
|
get_GPSlon(gpx);
|
|
err = get_GPSalt(gpx);
|
|
if (!err) {
|
|
printf(" lat: %.5f ", gpx->lat);
|
|
printf(" lon: %.5f ", gpx->lon);
|
|
printf(" alt: %.2fm ", gpx->alt);
|
|
get_GPSvel24(gpx);
|
|
//if (gpx->option.vbs == 2) printf(" (%.1f ,%.1f,%.1f) ", gpx->vE, gpx->vN, gpx->vU);
|
|
printf(" vH: %.1fm/s D: %.1f vV: %.1fm/s ", gpx->vH, gpx->vD, gpx->vV);
|
|
}
|
|
|
|
if (crc_err==0) printf(" [OK]"); else printf(" [NO]");
|
|
|
|
printf("\n");
|
|
|
|
|
|
if (gpx->option.jsn) {
|
|
// Print JSON output required by auto_rx.
|
|
if (crc_err==0) { // CRC-OK
|
|
// UTC oder GPS?
|
|
printf("{ \"frame\": %d, \"id\": \"LMS6-%d\", \"datetime\": \"", gpx->frnr, gpx->sn );
|
|
//if (gpx->week > 0) printf("%04d-%02d-%02dT", gpx->jahr, gpx->monat, gpx->tag );
|
|
printf("%02d:%02d:%06.3fZ\", \"lat\": %.5f, \"lon\": %.5f, \"alt\": %.5f, \"vel_h\": %.5f, \"heading\": %.5f, \"vel_v\": %.5f",
|
|
gpx->std, gpx->min, gpx->sek, gpx->lat, gpx->lon, gpx->alt, gpx->vH, gpx->vD, gpx->vV );
|
|
printf(", \"gpstow\": %d", gpx->gpstow );
|
|
printf(" }\n");
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void proc_frame(gpx_t *gpx, int len) {
|
|
int blk_pos = SYNC_LEN;
|
|
ui8_t block_bytes[BLOCK_LEN+8];
|
|
ui8_t rs_cw[rs_N];
|
|
char frame_bits[BITFRAME_LEN+OVERLAP*BITS +8]; // init L-1 bits mit 0
|
|
char *rawbits = NULL;
|
|
int i, j;
|
|
int err = 0;
|
|
int errs = 0;
|
|
int crc_err = 0;
|
|
int flen, blen;
|
|
|
|
|
|
if ((len % 8) > 4) {
|
|
while (len % 8) gpx->blk_rawbits[len++] = '0';
|
|
}
|
|
gpx->blk_rawbits[len] = '\0';
|
|
|
|
flen = len / (2*BITS);
|
|
|
|
if (gpx->option.vit == 1) {
|
|
viterbi(gpx->vit, gpx->blk_rawbits);
|
|
rawbits = gpx->vit->rawbits;
|
|
}
|
|
else rawbits = gpx->blk_rawbits;
|
|
|
|
err = deconv(rawbits, frame_bits);
|
|
|
|
if (err) { for (i=err; i < RAWBITBLOCK_LEN/2; i++) frame_bits[i] = 0; }
|
|
|
|
|
|
blen = bits2bytes(frame_bits, block_bytes);
|
|
for (j = blen; j < BLOCK_LEN+8; j++) block_bytes[j] = 0;
|
|
|
|
|
|
if (gpx->option.ecc) {
|
|
for (j = 0; j < rs_N; j++) rs_cw[rs_N-1-j] = block_bytes[SYNC_LEN+j];
|
|
errs = lms6_ecc(gpx, rs_cw);
|
|
for (j = 0; j < rs_N; j++) block_bytes[SYNC_LEN+j] = rs_cw[rs_N-1-j];
|
|
}
|
|
|
|
if (gpx->option.raw == 2) {
|
|
for (i = 0; i < flen; i++) printf("%02x ", block_bytes[i]);
|
|
if (gpx->option.ecc) printf("(%d)", errs);
|
|
printf("\n");
|
|
}
|
|
else if (gpx->option.raw == 4 && gpx->option.ecc) {
|
|
for (i = 0; i < rs_N; i++) printf("%02x", block_bytes[SYNC_LEN+i]);
|
|
printf(" (%d)", errs);
|
|
printf("\n");
|
|
}
|
|
else if (gpx->option.raw == 8) {
|
|
if (gpx->option.vit == 1) {
|
|
for (i = 0; i < len; i++) printf("%c", gpx->vit->rawbits[i]); printf("\n");
|
|
}
|
|
else {
|
|
for (i = 0; i < len; i++) printf("%c", gpx->blk_rawbits[i]); printf("\n");
|
|
}
|
|
}
|
|
|
|
blk_pos = SYNC_LEN;
|
|
|
|
while ( blk_pos-SYNC_LEN < FRM_LEN ) {
|
|
|
|
if (gpx->sf == 0) {
|
|
while ( blk_pos-SYNC_LEN < FRM_LEN ) {
|
|
gpx->sf = 0;
|
|
for (j = 0; j < 4; j++) gpx->sf += (block_bytes[blk_pos+j] == frm_sync[j]);
|
|
if (gpx->sf == 4) {
|
|
gpx->frm_pos = 0;
|
|
break;
|
|
}
|
|
blk_pos++;
|
|
}
|
|
}
|
|
|
|
if ( gpx->sf && gpx->frm_pos < FRM_LEN ) {
|
|
gpx->frame[gpx->frm_pos] = block_bytes[blk_pos];
|
|
gpx->frm_pos++;
|
|
blk_pos++;
|
|
}
|
|
|
|
if (gpx->frm_pos == FRM_LEN) {
|
|
|
|
crc_err = check_CRC(gpx->frame);
|
|
|
|
if (gpx->option.raw == 1) {
|
|
for (i = 0; i < FRM_LEN; i++) printf("%02x ", gpx->frame[i]);
|
|
if (crc_err==0) printf(" [OK]"); else printf(" [NO]");
|
|
printf("\n");
|
|
}
|
|
|
|
if (gpx->option.raw == 0) print_frame(gpx, crc_err, len);
|
|
|
|
gpx->frm_pos = 0;
|
|
gpx->sf = 0;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv) {
|
|
|
|
int option_inv = 0; // invertiert Signal
|
|
int option_iq = 0;
|
|
int option_lp = 0;
|
|
int option_dc = 0;
|
|
int wavloaded = 0;
|
|
int sel_wavch = 0; // audio channel: left
|
|
int gpsweek = 0;
|
|
|
|
FILE *fp = NULL;
|
|
char *fpname = NULL;
|
|
|
|
int k;
|
|
|
|
int bit, rbit;
|
|
int bitpos = 0;
|
|
int bitQ;
|
|
int pos;
|
|
//int headerlen = 0;
|
|
|
|
int header_found = 0;
|
|
|
|
float thres = 0.76;
|
|
float _mv = 0.0;
|
|
|
|
int symlen = 1;
|
|
int bitofs = 1; // +1 .. +2
|
|
int shift = 0;
|
|
|
|
unsigned int bc = 0;
|
|
|
|
pcm_t pcm = {0};
|
|
dsp_t dsp = {0}; //memset(&dsp, 0, sizeof(dsp));
|
|
/*
|
|
// gpx_t _gpx = {0}; gpx_t *gpx = &_gpx; // stack size ...
|
|
gpx_t *gpx = NULL;
|
|
gpx = calloc(1, sizeof(gpx_t));
|
|
//memset(gpx, 0, sizeof(gpx_t));
|
|
*/
|
|
gpx_t _gpx = {0}; gpx_t *gpx = &_gpx;
|
|
|
|
|
|
#ifdef CYGWIN
|
|
_setmode(fileno(stdin), _O_BINARY); // _setmode(_fileno(stdin), _O_BINARY);
|
|
#endif
|
|
setbuf(stdout, NULL);
|
|
|
|
|
|
fpname = argv[0];
|
|
++argv;
|
|
while ((*argv) && (!wavloaded)) {
|
|
if ( (strcmp(*argv, "-h") == 0) || (strcmp(*argv, "--help") == 0) ) {
|
|
fprintf(stderr, "%s [options] audio.wav\n", fpname);
|
|
fprintf(stderr, " options:\n");
|
|
fprintf(stderr, " -v, --verbose\n");
|
|
fprintf(stderr, " -r, --raw\n");
|
|
fprintf(stderr, " --vit (Viterbi)\n");
|
|
fprintf(stderr, " --ecc (Reed-Solomon)\n");
|
|
return 0;
|
|
}
|
|
else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
|
|
gpx->option.vbs = 1;
|
|
}
|
|
else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
|
|
gpx->option.raw = 1; // bytes - rs_ecc_codewords
|
|
}
|
|
else if ( (strcmp(*argv, "-r0") == 0) || (strcmp(*argv, "--raw0") == 0) ) {
|
|
gpx->option.raw = 2; // bytes: sync + codewords
|
|
}
|
|
else if ( (strcmp(*argv, "-rc") == 0) || (strcmp(*argv, "--rawecc") == 0) ) {
|
|
gpx->option.raw = 4; // rs_ecc_codewords
|
|
}
|
|
else if ( (strcmp(*argv, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) {
|
|
gpx->option.raw = 8; // rawbits
|
|
}
|
|
else if (strcmp(*argv, "--ecc" ) == 0) { gpx->option.ecc = 1; } // RS-ECC
|
|
else if (strcmp(*argv, "--vit" ) == 0) { gpx->option.vit = 1; } // viterbi
|
|
else if ( (strcmp(*argv, "--gpsweek") == 0) ) {
|
|
++argv;
|
|
if (*argv) {
|
|
gpsweek = atoi(*argv);
|
|
if (gpsweek < 1024 || gpsweek > 3072) gpsweek = 0;
|
|
}
|
|
else return -1;
|
|
}
|
|
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
|
|
option_inv = 1; // nicht noetig
|
|
}
|
|
else if ( (strcmp(*argv, "--dc") == 0) ) {
|
|
option_dc = 1;
|
|
}
|
|
else if ( (strcmp(*argv, "--ch2") == 0) ) { sel_wavch = 1; } // right channel (default: 0=left)
|
|
else if ( (strcmp(*argv, "--ths") == 0) ) {
|
|
++argv;
|
|
if (*argv) {
|
|
thres = atof(*argv);
|
|
}
|
|
else return -1;
|
|
}
|
|
else if ( (strcmp(*argv, "-d") == 0) ) {
|
|
++argv;
|
|
if (*argv) {
|
|
shift = atoi(*argv);
|
|
if (shift > 4) shift = 4;
|
|
if (shift < -4) shift = -4;
|
|
}
|
|
else return -1;
|
|
}
|
|
else if (strcmp(*argv, "--iq0") == 0) { option_iq = 1; } // differential/FM-demod
|
|
else if (strcmp(*argv, "--iq2") == 0) { option_iq = 2; }
|
|
else if (strcmp(*argv, "--iq3") == 0) { option_iq = 3; } // iq2==iq3
|
|
else if (strcmp(*argv, "--IQ") == 0) { // fq baseband -> IF (rotate from and decimate)
|
|
double fq = 0.0; // --IQ <fq> , -0.5 < fq < 0.5
|
|
++argv;
|
|
if (*argv) fq = atof(*argv);
|
|
else return -1;
|
|
if (fq < -0.5) fq = -0.5;
|
|
if (fq > 0.5) fq = 0.5;
|
|
dsp.xlt_fq = -fq; // S(t) -> S(t)*exp(-f*2pi*I*t)
|
|
option_iq = 5;
|
|
}
|
|
else if (strcmp(*argv, "--lp") == 0) { option_lp = 1; } // IQ lowpass
|
|
else if (strcmp(*argv, "--json") == 0) {
|
|
gpx->option.jsn = 1;
|
|
gpx->option.ecc = 1;
|
|
gpx->option.vit = 1;
|
|
}
|
|
else {
|
|
fp = fopen(*argv, "rb");
|
|
if (fp == NULL) {
|
|
fprintf(stderr, "%s konnte nicht geoeffnet werden\n", *argv);
|
|
return -1;
|
|
}
|
|
wavloaded = 1;
|
|
}
|
|
++argv;
|
|
}
|
|
if (!wavloaded) fp = stdin;
|
|
|
|
|
|
if (gpx->option.raw == 4) gpx->option.ecc = 1;
|
|
|
|
// init gpx
|
|
memcpy(gpx->blk_rawbits, blk_syncbits, sizeof(blk_syncbits));
|
|
memcpy(gpx->frame, frm_sync, sizeof(frm_sync));
|
|
gpx->frm_pos = 0; // ecc_blk <-> frm_blk
|
|
gpx->sf = 0;
|
|
|
|
gpx->option.inv = option_inv; // irrelevant
|
|
|
|
gpx->week = gpsweek;
|
|
|
|
if (option_iq) sel_wavch = 0;
|
|
|
|
pcm.sel_ch = sel_wavch;
|
|
k = read_wav_header(&pcm, fp);
|
|
if ( k < 0 ) {
|
|
fclose(fp);
|
|
fprintf(stderr, "error: wav header\n");
|
|
return -1;
|
|
}
|
|
|
|
symlen = 1;
|
|
|
|
// init dsp
|
|
//
|
|
dsp.fp = fp;
|
|
dsp.sr = pcm.sr;
|
|
dsp.bps = pcm.bps;
|
|
dsp.nch = pcm.nch;
|
|
dsp.ch = pcm.sel_ch;
|
|
dsp.br = (float)BAUD_RATE;
|
|
dsp.sps = (float)dsp.sr/dsp.br;
|
|
dsp.symlen = symlen;
|
|
dsp.symhd = 1;
|
|
dsp._spb = dsp.sps*symlen;
|
|
dsp.hdr = rawheader;
|
|
dsp.hdrlen = strlen(rawheader);
|
|
dsp.BT = 1.5; // bw/time (ISI) // 1.0..2.0
|
|
dsp.h = 0.9; // 1.0 modulation index
|
|
dsp.lpIQ_bw = 8e3;
|
|
dsp.opt_iq = option_iq;
|
|
dsp.opt_lp = option_lp;
|
|
|
|
if ( dsp.sps < 8 ) {
|
|
fprintf(stderr, "note: sample rate low (%.1f sps)\n", dsp.sps);
|
|
}
|
|
|
|
//headerlen = dsp.hdrlen;
|
|
|
|
k = init_buffers(&dsp);
|
|
if ( k < 0 ) {
|
|
fprintf(stderr, "error: init buffers\n");
|
|
return -1;
|
|
};
|
|
|
|
|
|
if (gpx->option.vit) {
|
|
k = vit_initCodes(gpx);
|
|
if (k < 0) return -1;
|
|
}
|
|
if (gpx->option.ecc) {
|
|
rs_init_RS255ccsds(&gpx->RS); // bch_ecc.c
|
|
}
|
|
|
|
|
|
bitofs += shift;
|
|
|
|
|
|
while ( 1 )
|
|
{
|
|
|
|
header_found = find_header(&dsp, thres, 3, bitofs, option_dc);
|
|
_mv = dsp.mv;
|
|
|
|
if (header_found == EOF) break;
|
|
|
|
// mv == correlation score
|
|
if (_mv*(0.5-gpx->option.inv) < 0) {
|
|
gpx->option.inv ^= 0x1; // LMS6: irrelevant
|
|
}
|
|
|
|
if (header_found) {
|
|
|
|
bitpos = 0;
|
|
pos = BLOCKSTART;
|
|
|
|
if (_mv > 0) bc = 0; else bc = 1;
|
|
|
|
while ( pos < RAWBITBLOCK_LEN ) {
|
|
|
|
bitQ = read_slbit(&dsp, &rbit, 0, bitofs, bitpos, -1, 0); // symlen=1
|
|
|
|
if (bitQ == EOF) { break; }
|
|
|
|
bit = rbit ^ (bc%2); // (c0,inv(c1))
|
|
gpx->blk_rawbits[pos] = 0x30 + bit;
|
|
|
|
bc++;
|
|
pos++;
|
|
bitpos += 1;
|
|
}
|
|
|
|
gpx->blk_rawbits[pos] = '\0';
|
|
|
|
time_elapsed_sec = dsp.sample_in / (double)dsp.sr;
|
|
proc_frame(gpx, pos);
|
|
|
|
if (pos < RAWBITBLOCK_LEN) break;
|
|
|
|
pos = BLOCKSTART;
|
|
header_found = 0;
|
|
}
|
|
|
|
}
|
|
|
|
|
|
free_buffers(&dsp);
|
|
if (gpx->vit) { free(gpx->vit); gpx->vit = NULL; }
|
|
|
|
fclose(fp);
|
|
|
|
return 0;
|
|
}
|
|
|