kopia lustrzana https://github.com/rs1729/RS
804 wiersze
21 KiB
C
804 wiersze
21 KiB
C
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/*
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Sippican MkIIa
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LMS-6 (1680 MHz)
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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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// optional JSON "version"
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// (a) set global
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// gcc -DVERSION_JSN [-I<inc_dir>] ...
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#ifdef VERSION_JSN
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#include "version_jsn.h"
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#endif
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// or
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// (b) set local compiler option, e.g.
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// gcc -DVER_JSN_STR=\"0.0.2\" ...
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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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int option_verbose = 0, // ausfuehrliche Anzeige
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option_raw = 0, // rohe Frames
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option_inv = 0, // invertiert Signal
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option_crc = 0, // check CRC
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option_res = 0, // genauere Bitmessung
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option_b = 0,
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option_jsn = 0, // JSON output (auto_rx)
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wavloaded = 0;
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/* -------------------------------------------------------------------------- */
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#define BAUD_RATE 9616 // 9616..9618
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int sample_rate = 0, bits_sample = 0, channels = 0;
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float samples_per_bit = 0;
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int findstr(char *buf, char *str, int pos) {
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int i;
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for (i = 0; i < 4; i++) {
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if (buf[(pos+i)%4] != str[i]) break;
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}
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return i;
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}
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int read_wav_header(FILE *fp) {
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char txt[4+1] = "\0\0\0\0";
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unsigned char dat[4];
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int byte, p=0;
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if (fread(txt, 1, 4, fp) < 4) return -1;
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if (strncmp(txt, "RIFF", 4)) return -1;
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if (fread(txt, 1, 4, fp) < 4) return -1;
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// pos_WAVE = 8L
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if (fread(txt, 1, 4, fp) < 4) return -1;
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if (strncmp(txt, "WAVE", 4)) return -1;
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// pos_fmt = 12L
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for ( ; ; ) {
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if ( (byte=fgetc(fp)) == EOF ) return -1;
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txt[p % 4] = byte;
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p++; if (p==4) p=0;
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if (findstr(txt, "fmt ", p) == 4) break;
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}
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if (fread(dat, 1, 4, fp) < 4) return -1;
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if (fread(dat, 1, 2, fp) < 2) return -1;
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if (fread(dat, 1, 2, fp) < 2) return -1;
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channels = dat[0] + (dat[1] << 8);
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if (fread(dat, 1, 4, fp) < 4) return -1;
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memcpy(&sample_rate, dat, 4); //sample_rate = dat[0]|(dat[1]<<8)|(dat[2]<<16)|(dat[3]<<24);
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if (fread(dat, 1, 4, fp) < 4) return -1;
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if (fread(dat, 1, 2, fp) < 2) return -1;
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//byte = dat[0] + (dat[1] << 8);
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if (fread(dat, 1, 2, fp) < 2) return -1;
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bits_sample = dat[0] + (dat[1] << 8);
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// pos_dat = 36L + info
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for ( ; ; ) {
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if ( (byte=fgetc(fp)) == EOF ) return -1;
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txt[p % 4] = byte;
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p++; if (p==4) p=0;
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if (findstr(txt, "data", p) == 4) break;
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}
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if (fread(dat, 1, 4, fp) < 4) return -1;
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fprintf(stderr, "sample_rate: %d\n", sample_rate);
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fprintf(stderr, "bits : %d\n", bits_sample);
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fprintf(stderr, "channels : %d\n", channels);
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if ((bits_sample != 8) && (bits_sample != 16)) return -1;
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samples_per_bit = sample_rate/(float)BAUD_RATE;
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fprintf(stderr, "samples/bit: %.2f\n", samples_per_bit);
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return 0;
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}
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#define EOF_INT 0x1000000
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unsigned long sample_count = 0;
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int read_signed_sample(FILE *fp) { // int = i32_t
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int byte, i, ret; // EOF -> 0x1000000
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for (i = 0; i < channels; i++) {
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// i = 0: links bzw. mono
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byte = fgetc(fp);
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if (byte == EOF) return EOF_INT;
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if (i == 0) ret = byte;
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if (bits_sample == 16) {
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byte = fgetc(fp);
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if (byte == EOF) return EOF_INT;
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if (i == 0) ret += byte << 8;
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}
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}
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sample_count++;
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if (bits_sample == 8) return ret-128; // 8bit: 00..FF, centerpoint 0x80=128
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if (bits_sample == 16) return (short)ret;
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return ret;
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}
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int par=1, par_alt=1;
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int read_bits_fsk(FILE *fp, int *bit, int *len) {
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static int sample;
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int n, y0;
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float l, x1;
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static float x0;
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n = 0;
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do{
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y0 = sample;
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sample = read_signed_sample(fp);
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if (sample == EOF_INT) return EOF;
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//sample_count++;
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par_alt = par;
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par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
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n++;
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} while (par*par_alt > 0);
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if (!option_res) l = (float)n / samples_per_bit;
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else { // genauere Bitlaengen-Messung
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x1 = sample/(float)(sample-y0); // hilft bei niedriger sample rate
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l = (n+x0-x1) / samples_per_bit; // meist mehr frames (nicht immer)
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x0 = x1;
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}
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*len = (int)(l+0.5);
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if (!option_inv) *bit = (1+par_alt)/2; // oben 1, unten -1
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else *bit = (1-par_alt)/2; // sdr#<rev1381?, invers: unten 1, oben -1
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// *bit = (1+inv*par_alt)/2; // ausser inv=0
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/* Y-offset ? */
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return 0;
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}
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int bitstart = 0;
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double bitgrenze = 0;
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unsigned long scount = 0;
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int read_rawbit(FILE *fp, int *bit) {
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int sample;
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int sum;
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sum = 0;
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if (bitstart) {
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scount = 1; // eigentlich scount = 1
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bitgrenze = 0; // oder bitgrenze = -1
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bitstart = 0;
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}
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bitgrenze += samples_per_bit;
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do {
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sample = read_signed_sample(fp);
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if (sample == EOF_INT) return EOF;
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//sample_count++; // in read_signed_sample()
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//par = (sample >= 0) ? 1 : -1; // 8bit: 0..127,128..255 (-128..-1,0..127)
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sum += sample;
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scount++;
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} while (scount < bitgrenze); // n < samples_per_bit
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if (sum >= 0) *bit = 1;
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else *bit = 0;
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if (option_inv) *bit ^= 1;
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return 0;
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}
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/* -------------------------------------------------------------------------- */
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#define BITS (1+8+1) // 8N1 = 10bit/byte
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#define HEADLEN 40
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#define HEADOFS 0
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// CA CA CA 24 52
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char header[] = "0010100111""0010100111""0010100111""0001001001"; //"0010010101";
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// moeglicherweise auch anderes sync-byte als 0xCA moeglich
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char sync[] = "0010100111""0010100111""0010100111""0010100111"; // CA CA CA CA
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#define FRAMESTART 0
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#define FRAME_LEN (960+2) // max; min 36+3 GPS
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#define BITFRAME_LEN (FRAME_LEN*BITS)
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char buf[HEADLEN];
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int bufpos = -1;
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ui8_t frame_bytes[FRAME_LEN] = { 0x24 }; // = { 0x24, 0x52, ... };
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char frame_bits[BITFRAME_LEN+4];
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void inc_bufpos() {
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bufpos = (bufpos+1) % HEADLEN;
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}
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char cb_inv(char c) {
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if (c == '0') return '1';
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if (c == '1') return '0';
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return c;
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}
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int compare2() {
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int i, j;
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i = 0;
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j = bufpos;
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while (i < HEADLEN) {
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if (j < 0) j = HEADLEN-1;
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if (buf[j] != header[HEADOFS+HEADLEN-1-i]) break;
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j--;
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i++;
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}
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if (i == HEADLEN) return 1;
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/*
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i = 0;
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j = bufpos;
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while (i < HEADLEN) {
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if (j < 0) j = HEADLEN-1;
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if (buf[j] != cb_inv(header[HEADOFS+HEADLEN-1-i])) break;
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j--;
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i++;
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}
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if (i == HEADLEN) return -1;
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*/
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return 0;
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}
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int findsync() {
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int i, j;
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i = 0;
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j = bufpos;
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// SYNCLEN=HEADLEN
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while (i < HEADLEN) {
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if (j < 0) j = HEADLEN-1;
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if (buf[j] != sync[HEADLEN-1-i]) break;
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j--;
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i++;
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}
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if (i == HEADLEN) return 1;
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return 0;
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}
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int bits2bytes(char *bitstr, ui8_t *bytes) {
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int i, bit, d, byteval;
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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 < FRAME_LEN) {
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byteval = 0;
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d = 1;
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for (i = 1; i < BITS-1; i++) {
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bit = *(bitstr+bitpos+i); /* little endian */
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//bit = *(bitstr+bitpos+BITS-1-i); /* big endian */
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if (bit == '\0') goto frame_end;
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if (bit == '1') byteval += d;
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else /*if ((bit == '0') */ 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;
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}
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frame_end:
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for (i = bytepos; i < FRAME_LEN; i++) bytes[i] = 0;
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return bytepos;
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}
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/* -------------------------------------------------------------------------- */
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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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typedef struct {
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int frnr;
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int prev_frnr;
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ui32_t id;
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int week; int gpstow;
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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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//int freq;
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int jsn_freq; // freq/kHz (SDR)
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} gpx_t;
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gpx_t gpx;
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#define OFS 2 // (0x2452 ..)
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#define pos_SondeID (OFS+0x02) // 2 byte (LSB)
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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+0x08) // 4 byte, subframe 0x(2452)54
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#define pos_GPSlat (OFS+0x10) // 4 byte, subframe 0x(2452)54
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#define pos_GPSlon (OFS+0x14) // 4 byte, subframe 0x(2452)54
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#define pos_GPSalt (OFS+0x18) // 4 byte, subframe 0x(2452)54
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//GPS Velocity East-North-Up (ENU)
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#define pos_GPSvO (OFS+0x1C) // 3 byte, subframe 0x(2452)54
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#define pos_GPSvN (OFS+0x1F) // 3 byte, subframe 0x(2452)54
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#define pos_GPSvV (OFS+0x22) // 3 byte, subframe 0x(2452)54
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// full 1680MHz-ID, config-subblock:sonde_id
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#define pos_FullID (OFS+0x30) // 2+2 byte (LSB,MSB), subframe 0x(2452)4D
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int check_CRC(int len) {
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ui32_t crclen = 0,
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crcdat = 0;
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/*
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if (frame_bytes[OFS] == 0x4D) crclen = 67;
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else if (frame_bytes[OFS] == 0x54) crclen = 172; // 172, 146? variable? Mk2a, LMS6-1680?
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else crclen = len;
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*/
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crclen = len;
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crcdat = (frame_bytes[crclen]<<8) | frame_bytes[crclen+1];
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if ( crcdat != crc16_0(frame_bytes, 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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int get_FrameNb() {
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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 = frame_bytes[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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char weekday[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
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int get_GPStime() {
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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 = frame_bytes[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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gpx.gpstow = gpstime;
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ms = gpstime % 1000;
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gpstime /= 1000;
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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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double B60B60 = 0xB60B60; // 2^32/360 = 0xB60B60.xxx
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int get_GPSlat() {
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int i;
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unsigned byte;
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ui8_t gpslat_bytes[4];
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int gpslat;
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double lat;
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for (i = 0; i < 4; i++) {
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byte = frame_bytes[pos_GPSlat + i];
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if (byte > 0xFF) return -1;
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gpslat_bytes[i] = byte;
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}
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gpslat = 0;
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for (i = 0; i < 4; i++) {
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gpslat |= gpslat_bytes[i] << (8*(3-i));
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}
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lat = gpslat / B60B60;
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gpx.lat = lat;
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return 0;
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}
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int get_GPSlon() {
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int i;
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unsigned byte;
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ui8_t gpslon_bytes[4];
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int gpslon;
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double lon;
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for (i = 0; i < 4; i++) {
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byte = frame_bytes[pos_GPSlon + i];
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if (byte > 0xFF) return -1;
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gpslon_bytes[i] = byte;
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}
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gpslon = 0;
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for (i = 0; i < 4; i++) {
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gpslon |= gpslon_bytes[i] << (8*(3-i));
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}
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lon = gpslon / B60B60;
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gpx.lon = lon;
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return 0;
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}
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int get_GPSalt() {
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int i;
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unsigned byte;
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ui8_t gpsheight_bytes[4];
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int gpsheight;
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double height;
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for (i = 0; i < 4; i++) {
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byte = frame_bytes[pos_GPSalt + i];
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if (byte > 0xFF) return -1;
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gpsheight_bytes[i] = byte;
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}
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gpsheight = 0;
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for (i = 0; i < 4; i++) {
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gpsheight |= gpsheight_bytes[i] << (8*(3-i));
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}
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height = gpsheight / 1000.0;
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gpx.alt = height;
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if (height < -100 || height > 60000) return -1;
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return 0;
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}
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int get_GPSvel24() {
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int i;
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unsigned byte;
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ui8_t gpsVel_bytes[3];
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int vel24;
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double vx, vy, vz, dir; //, alpha;
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for (i = 0; i < 3; i++) {
|
|
byte = frame_bytes[pos_GPSvO + i];
|
|
if (byte > 0xFF) return -1;
|
|
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 = frame_bytes[pos_GPSvN + i];
|
|
if (byte > 0xFF) return -1;
|
|
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 = frame_bytes[pos_GPSvV + i];
|
|
if (byte > 0xFF) return -1;
|
|
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;
|
|
}
|
|
|
|
void print_frame(int len) {
|
|
|
|
int i, crc_err = 0;
|
|
int flen = len/BITS;
|
|
|
|
for (i = len; i < BITFRAME_LEN; i++) frame_bits[i] = 0; // oder: '0'
|
|
bits2bytes(frame_bits, frame_bytes+1);
|
|
|
|
while (flen > 2 && frame_bytes[flen-1] == 0xCA) flen--; // if crc != 0xYYCA ...
|
|
|
|
crc_err = check_CRC(flen-2);
|
|
if (crc_err) { // crc_bytes == sync_bytes?
|
|
crc_err = check_CRC(flen-1);
|
|
if (crc_err == 0) flen += 1;
|
|
else {
|
|
crc_err = check_CRC(flen);
|
|
if (crc_err == 0) flen += 2;
|
|
}
|
|
}
|
|
|
|
if (option_raw) {
|
|
for (i = 0; i < flen; i++) printf("%02x ", frame_bytes[i]);
|
|
if (option_crc) {
|
|
if (crc_err==0) printf(" [OK]"); else printf(" [NO]");
|
|
}
|
|
printf("\n");
|
|
}
|
|
else {
|
|
|
|
if (frame_bytes[OFS] == 0x4D && len/BITS > pos_FullID+4) {
|
|
if ( !crc_err ) {
|
|
if (frame_bytes[pos_SondeID] == frame_bytes[pos_FullID] &&
|
|
frame_bytes[pos_SondeID+1] == frame_bytes[pos_FullID+1]) {
|
|
ui32_t __id = (frame_bytes[pos_FullID+2]<<24) | (frame_bytes[pos_FullID+3]<<16)
|
|
| (frame_bytes[pos_FullID] << 8) | frame_bytes[pos_FullID+1];
|
|
gpx.id = __id;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (frame_bytes[OFS] == 0x54 && len/BITS > pos_GPSalt+4) {
|
|
|
|
get_FrameNb();
|
|
get_GPStime();
|
|
get_GPSlat();
|
|
get_GPSlon();
|
|
get_GPSalt();
|
|
|
|
if ( !crc_err ) {
|
|
ui32_t _id = (frame_bytes[pos_SondeID]<<8) | frame_bytes[pos_SondeID+1];
|
|
if ((gpx.id & 0xFFFF) != _id) gpx.id = _id;
|
|
}
|
|
if (option_verbose && !crc_err) {
|
|
if (gpx.id & 0xFFFF0000) printf(" (%u)", gpx.id);
|
|
else if (gpx.id) printf(" (0x%04X)", gpx.id);
|
|
}
|
|
|
|
printf(" [%5d] ", gpx.frnr);
|
|
|
|
printf("%s ", weekday[gpx.wday]);
|
|
printf("%02d:%02d:%06.3f ", gpx.std, gpx.min, gpx.sek); // falls Rundung auf 60s: Ueberlauf
|
|
printf(" lat: %.5f ", gpx.lat);
|
|
printf(" lon: %.5f ", gpx.lon);
|
|
printf(" alt: %.2fm ", gpx.alt);
|
|
|
|
get_GPSvel24();
|
|
printf(" vH: %.1fm/s D: %.1f vV: %.1fm/s ", gpx.vH, gpx.vD, gpx.vV);
|
|
//if (option_verbose == 2) printf(" (%.1f ,%.1f,%.1f) ", gpx.vE, gpx.vN, gpx.vU);
|
|
|
|
if (option_crc) {
|
|
if (crc_err==0) printf(" [OK]"); else printf(" [NO]");
|
|
}
|
|
|
|
printf("\n");
|
|
|
|
if (option_jsn) {
|
|
// Print JSON output required by auto_rx.
|
|
if (crc_err==0 && (gpx.id & 0xFFFF0000)) { // CRC-OK and FullID
|
|
if (gpx.prev_frnr != gpx.frnr) { //|| gpx.id != _id0
|
|
// UTC oder GPS?
|
|
char *ver_jsn = NULL;
|
|
printf("{ \"type\": \"%s\"", "LMS");
|
|
printf(", \"frame\": %d, \"id\": \"LMS6-%d\", \"datetime\": \"%02d:%02d:%06.3fZ\", \"lat\": %.5f, \"lon\": %.5f, \"alt\": %.5f, \"vel_h\": %.5f, \"heading\": %.5f, \"vel_v\": %.5f",
|
|
gpx.frnr, gpx.id, gpx.std, gpx.min, gpx.sek, gpx.lat, gpx.lon, gpx.alt, gpx.vH, gpx.vD, gpx.vV );
|
|
printf(", \"subtype\": \"%s\"", "MK2A");
|
|
if (gpx.jsn_freq > 0) {
|
|
printf(", \"freq\": %d", gpx.jsn_freq);
|
|
}
|
|
#ifdef VER_JSN_STR
|
|
ver_jsn = VER_JSN_STR;
|
|
#endif
|
|
if (ver_jsn && *ver_jsn != '\0') printf(", \"version\": \"%s\"", ver_jsn);
|
|
printf(" }\n");
|
|
printf("\n");
|
|
gpx.prev_frnr = gpx.frnr;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv) {
|
|
|
|
FILE *fp;
|
|
char *fpname;
|
|
int i, bit, len;
|
|
int pos;
|
|
int header_found = 0;
|
|
int cfreq = -1;
|
|
|
|
|
|
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");
|
|
return 0;
|
|
}
|
|
else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) {
|
|
option_verbose = 1;
|
|
}
|
|
//else if ( (strcmp(*argv, "-vv") == 0) ) option_verbose = 2;
|
|
else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) {
|
|
option_raw = 1;
|
|
}
|
|
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
|
|
option_inv = 1;
|
|
}
|
|
else if (strcmp(*argv, "-b" ) == 0) { option_b = 1; }
|
|
else if (strcmp(*argv, "--crc") == 0) { option_crc = 1; }
|
|
else if (strcmp(*argv, "--res") == 0) { option_res = 1; }
|
|
else if (strcmp(*argv, "--json") == 0) {
|
|
option_jsn = 1;
|
|
option_crc = 1;
|
|
option_verbose = 1;
|
|
}
|
|
else if (strcmp(*argv, "--jsn_cfq") == 0) {
|
|
int frq = -1; // center frequency / Hz
|
|
++argv;
|
|
if (*argv) frq = atoi(*argv); else return -1;
|
|
if (frq < 300000000) frq = -1;
|
|
cfreq = frq;
|
|
}
|
|
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;
|
|
|
|
gpx.jsn_freq = 0;
|
|
if (cfreq > 0) gpx.jsn_freq = (cfreq+500)/1000;
|
|
|
|
i = read_wav_header(fp);
|
|
if (i) {
|
|
fclose(fp);
|
|
return -1;
|
|
}
|
|
|
|
|
|
pos = FRAMESTART;
|
|
|
|
while (!read_bits_fsk(fp, &bit, &len)) {
|
|
|
|
if (len == 0) { // reset_frame();
|
|
if (pos > BITS*(pos_GPSalt+4)) {
|
|
print_frame(pos);
|
|
header_found = 0;
|
|
pos = FRAMESTART;
|
|
}
|
|
//inc_bufpos();
|
|
//buf[bufpos] = 'x';
|
|
continue; // ...
|
|
}
|
|
|
|
for (i = 0; i < len; i++) {
|
|
|
|
inc_bufpos();
|
|
buf[bufpos] = bit + 0x30;
|
|
|
|
if (!header_found) {
|
|
header_found = compare2();
|
|
}
|
|
else {
|
|
frame_bits[pos] = bit + 0x30;
|
|
pos++;
|
|
if ( pos == BITFRAME_LEN || findsync() ) {
|
|
print_frame(pos);//FRAME_LEN
|
|
header_found = 0;
|
|
pos = FRAMESTART;
|
|
}
|
|
}
|
|
}
|
|
if (header_found && option_b==1) {
|
|
bitstart = 1;
|
|
|
|
while ( pos < BITFRAME_LEN && !findsync()) {
|
|
if (read_rawbit(fp, &bit) == EOF) break;
|
|
inc_bufpos();
|
|
buf[bufpos] = bit + 0x30;
|
|
frame_bits[pos] = bit + 0x30;
|
|
pos++;
|
|
}
|
|
frame_bits[pos] = '\0';
|
|
print_frame(pos);//FRAME_LEN
|
|
|
|
header_found = 0;
|
|
pos = FRAMESTART;
|
|
}
|
|
|
|
}
|
|
|
|
printf("\n");
|
|
|
|
fclose(fp);
|
|
|
|
return 0;
|
|
}
|
|
|