kopia lustrzana https://github.com/projecthorus/radiosonde_auto_rx
654 wiersze
16 KiB
C
654 wiersze
16 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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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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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_res = 0, // genauere Bitmessung
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wavloaded = 0;
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/* -------------------------------------------------------------------------- */
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#define BAUD_RATE 4800
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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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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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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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unsigned long sample_count = 0;
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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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return 0;
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}
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/* -------------------------------------------------------------------------- */
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#define BITS 8
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#define HEADLEN (3*16)
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#define HEADOFS 0
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// (pp pp 24 54) 00 00 00 (7A..: SondeID, GPS, ...)
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char header[] = "0011101100100000""0000000000000000""0000000000000000";//"0010010011110001";
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#define FRAMESTART 0
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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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char buf[HEADLEN];
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int bufpos = -1;
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char frame_rawbits[RAWBITFRAME_LEN+8];
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#define K 8
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char polyA[] = "10010101"; // 0xA9
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char polyB[] = "00100010"; // 0x44
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char frame_bits[BITFRAME_LEN+K+4]; // init K-1 bits mit 0
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ui8_t frame_bytes[FRAME_LEN]; // = { 0x7A, ... };
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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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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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return 0;
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}
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int deconv(char* frame_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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len = strlen(frame_rawbits);
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for (j = 0; j < K-1; j++) bits[j] = '0';
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n = 0;
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while (2*n < len-2*K) {
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p = frame_rawbits+2*n;
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bitA = bitB = 0;
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for (j = 0; j < K-1; 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[K-1]&1) && (bitB^(p[1]&1))==(polyB[K-1]&1) ) bits[n+K-1] = '1';
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else if ( (bitA^(p[0]&1))==0 && (bitB^(p[1]&1))==0 ) bits[n+K-1] = '0';
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else { // error: no error correction...
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if ( (bitA^(p[0]&1))!=(polyA[K-1]&1) && (bitB^(p[1]&1))==(polyB[K-1]&1) ) bits[n+K-1] = 0x39;
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else bits[n+K-1] = 0x38;
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if (n < 256) errors++; // nur bis Ende GPS-vel; alternativ: return pos 1. error
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}
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n += 1;
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}
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bits[n+K-1] = '\0';
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return errors;
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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 = 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) bytes[bytepos++] = 0;
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return 0;
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}
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/* -------------------------------------------------------------------------- */
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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;
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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 h;
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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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} gpx_t;
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gpx_t gpx;
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#define pos_SondeSN 0x00 // ?3 byte 7A....
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#define pos_FrameNb 0x03 // 2 byte
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//GPS Position
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#define pos_GPSTOW 0x05 // 4 byte
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#define pos_GPSlat 0x0D // 4 byte
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#define pos_GPSlon 0x11 // 4 byte
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#define pos_GPSalt 0x15 // 4 byte
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//#define pos_GPSweek 0x20 // 2 byte
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//GPS Velocity East-North-Up (ENU)
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#define pos_GPSvO 0x19 // 3 byte
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#define pos_GPSvN 0x1C // 3 byte
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#define pos_GPSvV 0x1F // 3 byte
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int get_SondeSN() {
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unsigned byte;
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byte = (frame_bytes[pos_SondeSN]<<16) | (frame_bytes[pos_SondeSN+1]<<8) | frame_bytes[pos_SondeSN+2];
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gpx.sn = byte;
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return 0;
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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.h = 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++) {
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byte = frame_bytes[pos_GPSvO + i];
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if (byte > 0xFF) return -1;
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gpsVel_bytes[i] = byte;
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}
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vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
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if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
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vx = vel24 / 1e3; // ost
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for (i = 0; i < 3; i++) {
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byte = frame_bytes[pos_GPSvN + i];
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if (byte > 0xFF) return -1;
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gpsVel_bytes[i] = byte;
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}
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vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
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if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
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vy= vel24 / 1e3; // nord
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for (i = 0; i < 3; i++) {
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byte = frame_bytes[pos_GPSvV + i];
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if (byte > 0xFF) return -1;
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gpsVel_bytes[i] = byte;
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}
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vel24 = gpsVel_bytes[0] << 16 | gpsVel_bytes[1] << 8 | gpsVel_bytes[2];
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if (vel24 > (0x7FFFFF)) vel24 -= 0x1000000;
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vz = vel24 / 1e3; // hoch
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gpx.vE = vx;
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gpx.vN = vy;
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gpx.vU = vz;
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gpx.vH = sqrt(vx*vx+vy*vy);
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/*
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alpha = atan2(vy, vx)*180/M_PI; // ComplexPlane (von x-Achse nach links) - GeoMeteo (von y-Achse nach rechts)
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dir = 90-alpha; // z=x+iy= -> i*conj(z)=y+ix=re(i(pi/2-t)), Achsen und Drehsinn vertauscht
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if (dir < 0) dir += 360; // atan2(y,x)=atan(y/x)=pi/2-atan(x/y) , atan(1/t) = pi/2 - atan(t)
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gpx.vD2 = dir;
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*/
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dir = atan2(vx, vy) * 180 / M_PI;
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if (dir < 0) dir += 360;
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gpx.vD = dir;
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gpx.vV = vz;
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return 0;
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}
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void print_frame(int len) {
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int i, err = 0;
|
|
|
|
if (len > RAWBITFRAME_LEN) len = RAWBITFRAME_LEN;
|
|
|
|
for (i = len; i < RAWBITFRAME_LEN; i++) frame_rawbits[i] = 0; // oder: '0'
|
|
err = deconv(frame_rawbits, frame_bits);
|
|
bits2bytes(frame_bits+K-1, frame_bytes);
|
|
|
|
|
|
if (option_raw) {
|
|
if (option_raw == 1) {
|
|
for (i = 0; i < len/(2*BITS); i++) printf("%02x ", frame_bytes[i]); printf("\n");
|
|
}
|
|
else {
|
|
for (i = 0; i < len; i++) printf("%c", frame_rawbits[i]); printf("\n");
|
|
}
|
|
}
|
|
else if (!err && len > 8*2*(pos_GPSTOW+4)) {
|
|
|
|
if ((frame_bytes[0] & 0xF0) == 0x70) // ? beginnen alle SNs mit 0x7A.... bzw 80..... ?
|
|
{
|
|
get_FrameNb();
|
|
get_GPStime();
|
|
get_SondeSN();
|
|
if (option_verbose) printf(" (%7d) ", gpx.sn);
|
|
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
|
|
|
|
get_GPSlat();
|
|
get_GPSlon();
|
|
err = get_GPSalt();
|
|
if (!err) {
|
|
printf(" lat: %.6f° ", gpx.lat);
|
|
printf(" lon: %.6f° ", gpx.lon);
|
|
printf(" alt: %.2fm ", gpx.h);
|
|
//if (option_verbose)
|
|
{
|
|
get_GPSvel24();
|
|
//if (option_verbose == 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);
|
|
}
|
|
}
|
|
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv) {
|
|
|
|
FILE *fp;
|
|
char *fpname;
|
|
int i, bit, len, rbit, rbit0;
|
|
int pos;
|
|
//int header_found = 0;
|
|
|
|
|
|
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, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) {
|
|
option_raw = 2;
|
|
}
|
|
else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) {
|
|
option_inv = 1; // unnoetig, NRZ-S...
|
|
}
|
|
else if (strcmp(*argv, "--res") == 0) { option_res = 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;
|
|
|
|
i = read_wav_header(fp);
|
|
if (i) {
|
|
fclose(fp);
|
|
return -1;
|
|
}
|
|
|
|
|
|
pos = FRAMESTART;
|
|
rbit0 = 0; //idle
|
|
|
|
while (!read_bits_fsk(fp, &rbit, &len)) {
|
|
|
|
if (len == 0) { // reset_frame();
|
|
/*if (pos > 8*2*pos_GPSlon) {
|
|
//for (i = pos; i < RAWBITFRAME_LEN; i++) frame_rawbits[i] = '0';
|
|
print_frame(pos);
|
|
//header_found = 0;
|
|
pos = FRAMESTART;
|
|
}*/
|
|
//inc_bufpos();
|
|
//buf[bufpos] = 'x';
|
|
continue; // ...
|
|
}
|
|
|
|
for (i = 0; i < len; i++) {
|
|
|
|
inc_bufpos();
|
|
bit = 0x30 + (rbit==rbit0); // Ascii, NRZ-S
|
|
buf[bufpos] = bit;
|
|
rbit0 = rbit;
|
|
|
|
if (pos < RAWBITFRAME_LEN) frame_rawbits[pos] = bit;
|
|
pos++;
|
|
if ( compare2() ) { // GPS: (36+3)
|
|
print_frame(pos);//FRAME_LEN
|
|
//header_found = 0;
|
|
pos = FRAMESTART;
|
|
}
|
|
}
|
|
}
|
|
|
|
printf("\n");
|
|
|
|
fclose(fp);
|
|
|
|
return 0;
|
|
}
|
|
|