From 163b838795ff2205822741599c9a2625dcc195b3 Mon Sep 17 00:00:00 2001 From: rs1729 Date: Thu, 28 Feb 2019 13:10:04 +0100 Subject: [PATCH] lmsX: short frames --- demod/lmsXdm_dft.c | 1084 ++++++++++++++++++++++++++++++++++++++++++++ lms6/lmsX2446.c | 32 +- 2 files changed, 1108 insertions(+), 8 deletions(-) create mode 100644 demod/lmsXdm_dft.c diff --git a/demod/lmsXdm_dft.c b/demod/lmsXdm_dft.c new file mode 100644 index 0000000..9d4be23 --- /dev/null +++ b/demod/lmsXdm_dft.c @@ -0,0 +1,1084 @@ + +/* + * LMSx + * (403 MHz) + * + * sync header: correlation/matched filter + * files: lmsXdm_dft.c demod_dft.h demod_dft.c bch_ecc.c + * compile: + * gcc -c demod_dft.c + * gcc lmsXdm_dft.c demod_dft.o -lm -o lmsXdm_dft + * usage: + * ./lmsXdm_dft -v --vit --ecc + * + * author: zilog80 + */ + +#include +#include +#include +#include + +#ifdef CYGWIN + #include // cygwin: _setmode() + #include +#endif + + +typedef unsigned char ui8_t; +typedef unsigned short ui16_t; +typedef unsigned int ui32_t; + +#include "demod_dft.h" + +#include "bch_ecc.c" // RS/ecc/ + + +int option_verbose = 0, // ausfuehrliche Anzeige + option_raw = 0, // rohe Frames + option_ecc = 0, + option_vit = 0, + option_inv = 0, // invertiert Signal + option_dc = 0, + wavloaded = 0; +int wav_channel = 0; // audio channel: left + + +/* -------------------------------------------------------------------------- */ + +#define BAUD_RATE (4797.7) // = 4800 / (48023/48000) ? + +#define BITS 8 +#define HEADOFS 0 //16 +#define HEADLEN ((4*16)-HEADOFS) + +char rawheader[] = "0101011000001000""0001110010010111""0001101010100111""0011110100111110"; // (c0,inv(c1)) +// (00) 58 f3 3f b8 +//char header[] = "0000001101011101""0100100111000010""0100111111110010""0110100001101011"; // (c0,c1) +ui8_t rs_sync[] = { 0x00, 0x58, 0xf3, 0x3f, 0xb8}; +// 0x58f33fb8 little-endian <-> 0x1ACFFC1D big-endian bytes + +#define FRAME_LEN (300) // 4800baud, 16bits/byte +#define SYNC_LEN 5 +#define FRM_LEN (223) +#define PAR_LEN (32) +#define FRMBUF_LEN (3*FRM_LEN) +#define BLOCKSTART (SYNC_LEN*BITS*2) +#define BLOCK_LEN (FRM_LEN+PAR_LEN+SYNC_LEN) // 255+5 = 260 +//#define RAWBITBLOCK_LEN ((BLOCK_LEN+1)*BITS*2) // (+1 tail) +#define RAWBITBLOCK_LEN ((300)*BITS*2) + +// (00) 58 f3 3f b8 +char blk_rawbits[RAWBITBLOCK_LEN+SYNC_LEN*BITS*2 +8] = "0000000000000000""0000001101011101""0100100111000010""0100111111110010""0110100001101011"; +//char *block_rawbits = blk_rawbits+SYNC_LEN*BITS*2; + +float soft_rawbits[RAWBITBLOCK_LEN+SYNC_LEN*BITS*2 +8] = + { -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, + -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, + -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, + -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, + -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0 }; + +ui8_t block_bytes[FRAME_LEN+8]; // BLOCK_LEN + 40 + + +//ui8_t frm_sync[] = { 0x24, 0x54, 0x00, 0x00}; +ui8_t frm_sync[] = { 0x24, 0x46, 0x05, 0x00}; +ui8_t frame[FRM_LEN] = { 0x24, 0x54, 0x00, 0x00}; // dataheader + +ui8_t *p_frame = frame; + + +#define BITFRAME_LEN (FRAME_LEN*BITS) +#define RAWBITFRAME_LEN (BITFRAME_LEN*2) +#define OVERLAP 64 +#define OFS 4 + + +char frame_bits[BITFRAME_LEN+OVERLAP*BITS +8]; // init L-1 bits mit 0 + +#define L 7 // d_f=10 + char polyA[] = "1001111"; // 0x4f: x^6+x^3+x^2+x+1 + char polyB[] = "1101101"; // 0x6d: x^6+x^5+x^3+x^2+1 +/* +// d_f=6 +qA[] = "1110011"; // 0x73: x^6+x^5+x^4+x+1 +qB[] = "0011110"; // 0x1e: x^4+x^3+x^2+x +pA[] = "10010101"; // 0x95: x^7+x^4+x^2+1 = (x+1)(x^6+x^5+x^4+x+1) = (x+1)qA +pB[] = "00100010"; // 0x22: x^5+x = (x+1)(x^4+x^3+x^2+x)=x(x+1)^3 = (x+1)qB +polyA = qA + x*qB +polyB = qA + qB +*/ + +char vit_rawbits[RAWBITFRAME_LEN+OVERLAP*BITS*2 +8]; +char vits_rawbits[RAWBITFRAME_LEN+OVERLAP*BITS*2 +8]; +char vits_bits[BITFRAME_LEN+OVERLAP*BITS +8]; + +#define N (1 << L) +#define M (1 << (L-1)) + +typedef struct { + ui8_t bIn; + ui8_t codeIn; + int w; + int prevState; + float sw; +} states_t; + +states_t vit_state[RAWBITFRAME_LEN+OVERLAP +8][M]; + +states_t vit_d[N]; + +ui8_t vit_code[N]; + + +int vit_initCodes() { + int cA, cB; + int i, bits; + + for (bits = 0; bits < N; bits++) { + cA = 0; + cB = 0; + for (i = 0; i < L; i++) { + cA ^= (polyA[L-1-i]&1) & ((bits >> i)&1); + cB ^= (polyB[L-1-i]&1) & ((bits >> i)&1); + } + vit_code[bits] = (cA<<1) | cB; + } + + return 0; +} + +int vit_dist(int c, char *rc) { + return (((c>>1)^rc[0])&1) + ((c^rc[1])&1); +} + +int vit_start(char *rc) { + int t, m, j, c, d; + + t = L-1; + m = M; + while ( t > 0 ) { // t=0..L-2: nextState 0) { + c = vit_state[t][j].codeIn; + vit_rawbits[2*t -2] = 0x30 + ((c>>1) & 1); + vit_rawbits[2*t -1] = 0x30 + (c & 1); + j = vit_state[t][j].prevState; + t--; + } + + return 0; +} + +int viterbi(char *rc) { + int t, tmax; + int j, j_min, w_min; + + vit_start(rc); + + tmax = strlen(rc)/2; + + for (t = L-1; t < tmax; t++) + { + vit_next(t, rc+2*t); + } + + w_min = -1; + for (j = 0; j < M; j++) { + if (w_min < 0) { + w_min = vit_state[tmax][j].w; + j_min = j; + } + if (vit_state[tmax][j].w < w_min) { + w_min = vit_state[tmax][j].w; + j_min = j; + } + } + vit_path(j_min, tmax); + + return 0; +} + + +float vits_dist(int c, float *rc) { + int bit0 = ((c>>1)&1) * 2 - 1; + int bit1 = (c&1) * 2 - 1; + return sqrt( (bit0-rc[0])*(bit0-rc[0]) + (bit1-rc[1])*(bit1-rc[1]) ); +} + +int vits_start(float *rc) { + int t, m, j, c; + float d; + + t = L-1; + m = M; + while ( t > 0 ) { // t=0..L-2: nextState 0) { + dec = vit_state[t][j].bIn; + vits_bits[t-1] = 0x30 + dec; + c = vit_state[t][j].codeIn; + vits_rawbits[2*t -2] = 0x30 + ((c>>1) & 1); + vits_rawbits[2*t -1] = 0x30 + (c & 1); + j = vit_state[t][j].prevState; + t--; + } + + return 0; +} + +int viterbi_soft(float *rc, int len) { + int t, tmax; + int j, j_min; + float sw_min; + + vits_start(rc); + + tmax = len/2; + + for (t = L-1; t < tmax; t++) + { + vits_next(t, rc+2*t); + } + + sw_min = -1.0; + for (j = 0; j < M; j++) { + if (sw_min < 0.0) { + sw_min = vit_state[tmax][j].sw; + j_min = j; + } + if (vit_state[tmax][j].sw < sw_min) { + sw_min = vit_state[tmax][j].sw; + j_min = j; + } + } + vits_path(j_min, tmax); + + return 0; +} + +// ------------------------------------------------------------------------ + +int deconv(char* rawbits, char *bits) { + + int j, n, bitA, bitB; + char *p; + int len; + int errors = 0; + int m = L-1; + + len = strlen(rawbits); + for (j = 0; j < m; j++) bits[j] = '0'; + n = 0; + while ( 2*(m+n) < len ) { + p = rawbits+2*(m+n); + bitA = bitB = 0; + for (j = 0; j < m; j++) { + bitA ^= (bits[n+j]&1) & (polyA[j]&1); + bitB ^= (bits[n+j]&1) & (polyB[j]&1); + } + if ( (bitA^(p[0]&1))==(polyA[m]&1) && (bitB^(p[1]&1))==(polyB[m]&1) ) bits[n+m] = '1'; + else if ( (bitA^(p[0]&1))==0 && (bitB^(p[1]&1))==0 ) bits[n+m] = '0'; + else { + if ( (bitA^(p[0]&1))!=(polyA[m]&1) && (bitB^(p[1]&1))==(polyB[m]&1) ) bits[n+m] = 0x39; + else bits[n+m] = 0x38; + errors = n; + break; + } + n += 1; + } + bits[n+m] = '\0'; + + return errors; +} + +// ------------------------------------------------------------------------ + +int crc16_0(ui8_t frame[], int len) { + int crc16poly = 0x1021; + int rem = 0x0, i, j; + int byte; + + for (i = 0; i < len; i++) { + byte = frame[i]; + rem = rem ^ (byte << 8); + for (j = 0; j < 8; j++) { + if (rem & 0x8000) { + rem = (rem << 1) ^ crc16poly; + } + else { + rem = (rem << 1); + } + rem &= 0xFFFF; + } + } + return rem; +} + +int check_CRC(ui8_t frame[]) { + ui32_t crclen = 0, + crcdat = 0; + + crclen = 221; + crcdat = (frame[crclen]<<8) | frame[crclen+1]; + if ( crcdat != crc16_0(frame, crclen) ) { + return 1; // CRC NO + } + else return 0; // CRC OK +} + +// ------------------------------------------------------------------------ + +int bits2bytes(char *bitstr, ui8_t *bytes) { + int i, bit, d, byteval; + int len = strlen(bitstr)/8; + int bitpos, bytepos; + + bitpos = 0; + bytepos = 0; + + while (bytepos < len) { + + byteval = 0; + d = 1; + for (i = 0; i < BITS; i++) { + bit=*(bitstr+bitpos+i); /* little endian */ + //bit=*(bitstr+bitpos+7-i); /* big endian */ + if ((bit == '1') || (bit == '9')) byteval += d; + else /*if ((bit == '0') || (bit == '8'))*/ byteval += 0; + d <<= 1; + } + bitpos += BITS; + bytes[bytepos++] = byteval & 0xFF; + } + + //while (bytepos < FRAME_LEN+OVERLAP) bytes[bytepos++] = 0; + + return bytepos; +} + +/* -------------------------------------------------------------------------- */ + + +typedef struct { + int frnr; + int sn; + int week; int gpstow; + int jahr; int monat; int tag; + int wday; + int std; int min; float sek; + double lat; double lon; double h; + double vH; double vD; double vV; + double vE; double vN; double vU; + //int freq; +} gpx_t; + +gpx_t gpx; + +gpx_t gpx0 = { 0 }; + + +#define pos_SondeSN (OFS+0x00) // ?4 byte 00 7A.... +#define pos_FrameNb (OFS+0x04) // 2 byte +//GPS Position +#define pos_GPSTOW (OFS+0x06) // 4 byte +#define pos_GPSlat (OFS+0x0E) // 4 byte +#define pos_GPSlon (OFS+0x12) // 4 byte +#define pos_GPSalt (OFS+0x16) // 4 byte +//GPS Velocity East-North-Up (ENU) +#define pos_GPSvO (OFS+0x1A) // 2 byte +#define pos_GPSvN (OFS+0x1C) // 2 byte +#define pos_GPSvV (OFS+0x1E) // 2 byte + + +int get_SondeSN() { + unsigned byte; + + byte = (p_frame[pos_SondeSN]<<24) | (p_frame[pos_SondeSN+1]<<16) + | (p_frame[pos_SondeSN+2]<<8) | p_frame[pos_SondeSN+3]; + gpx.sn = byte & 0xFFFFFF; + + return 0; +} + +int get_FrameNb() { + int i; + unsigned byte; + ui8_t frnr_bytes[2]; + int frnr; + + gpx = gpx0; + + for (i = 0; i < 2; i++) { + byte = p_frame[pos_FrameNb + i]; + frnr_bytes[i] = byte; + } + + frnr = (frnr_bytes[0] << 8) + frnr_bytes[1] ; + gpx.frnr = frnr; + + return 0; +} + + +char weekday[7][3] = { "So", "Mo", "Di", "Mi", "Do", "Fr", "Sa"}; +//char weekday[7][4] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; + +int get_GPStime() { + int i; + unsigned byte; + ui8_t gpstime_bytes[4]; + int gpstime = 0, // 32bit + day; + float ms; + + for (i = 0; i < 4; i++) { + byte = p_frame[pos_GPSTOW + i]; + gpstime_bytes[i] = byte; + } + gpstime = 0; + for (i = 0; i < 4; i++) { + gpstime |= gpstime_bytes[i] << (8*(3-i)); + } + + gpx.gpstow = gpstime; + + ms = gpstime % 1000; + gpstime /= 1000; + + day = gpstime / (24 * 3600); + gpstime %= (24*3600); + + //if ((day < 0) || (day > 6)) return -1; + + gpx.wday = day; + gpx.std = gpstime / 3600; + gpx.min = (gpstime % 3600) / 60; + gpx.sek = gpstime % 60 + ms/1000.0; + + return 0; +} + +double B60B60 = 0xB60B60; // 2^32/360 = 0xB60B60.xxx + +int get_GPSlat() { + int i; + unsigned byte; + ui8_t gpslat_bytes[4]; + int gpslat; + double lat; + + for (i = 0; i < 4; i++) { + byte = p_frame[pos_GPSlat + i]; + if (byte > 0xFF) return -1; + gpslat_bytes[i] = byte; + } + + gpslat = 0; + for (i = 0; i < 4; i++) { + gpslat |= gpslat_bytes[i] << (8*(3-i)); + } + lat = gpslat / 1e7; // / B60B60; + gpx.lat = lat; + + return 0; +} + +int get_GPSlon() { + int i; + unsigned byte; + ui8_t gpslon_bytes[4]; + int gpslon; + double lon; + + for (i = 0; i < 4; i++) { + byte = p_frame[pos_GPSlon + i]; + if (byte > 0xFF) return -1; + gpslon_bytes[i] = byte; + } + + gpslon = 0; + for (i = 0; i < 4; i++) { + gpslon |= gpslon_bytes[i] << (8*(3-i)); + } + lon = gpslon / 1e7; // B60B60; + gpx.lon = lon; + + return 0; +} + +int get_GPSalt() { + int i; + unsigned byte; + ui8_t gpsheight_bytes[4]; + int gpsheight; + double height; + + for (i = 0; i < 4; i++) { + byte = p_frame[pos_GPSalt + i]; + if (byte > 0xFF) return -1; + gpsheight_bytes[i] = byte; + } + + gpsheight = 0; + for (i = 0; i < 4; i++) { + gpsheight |= gpsheight_bytes[i] << (8*(3-i)); + } + height = gpsheight / 100.0; + gpx.h = height; + + if (height < -100 || height > 60000) return -1; + return 0; +} + +int get_GPSvel24() { + int i; + unsigned byte; + ui8_t gpsVel_bytes[3]; + int vel24; + double vx, vy, vz, dir; //, alpha; + + for (i = 0; i < 3; i++) { + byte = p_frame[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 = p_frame[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 = p_frame[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; +} + +int get_GPSvel16() { + int i; + unsigned byte; + ui8_t gpsVel_bytes[2]; + short vel16; + double vx, vy, vz, dir; //, alpha; + + for (i = 0; i < 2; i++) { + byte = p_frame[pos_GPSvO + i]; + if (byte > 0xFF) return -1; + gpsVel_bytes[i] = byte; + } + vel16 = gpsVel_bytes[0] << 8 | gpsVel_bytes[1]; + vx = vel16 / 1e2; // ost + + for (i = 0; i < 2; i++) { + byte = p_frame[pos_GPSvN + i]; + if (byte > 0xFF) return -1; + gpsVel_bytes[i] = byte; + } + vel16 = gpsVel_bytes[0] << 8 | gpsVel_bytes[1]; + vy= vel16 / 1e2; // nord + + for (i = 0; i < 2; i++) { + byte = p_frame[pos_GPSvV + i]; + if (byte > 0xFF) return -1; + gpsVel_bytes[i] = byte; + } + vel16 = gpsVel_bytes[0] << 8 | gpsVel_bytes[1]; + vz = vel16 / 1e2; // hoch + + gpx.vH = vx; + gpx.vD = vy; + 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 +ui8_t rs_cw[rs_N]; + +int lms6_ecc(ui8_t *cw) { + int errors; + ui8_t err_pos[rs_R], + err_val[rs_R]; + + errors = rs_decode(cw, err_pos, err_val); + + return errors; +} + +void print_frame(int crc_err, int len) { + int err=0; + + if (p_frame[0] != 0) + { + //if ((p_frame[pos_SondeSN+1] & 0xF0) == 0x70) // ? beginnen alle SNs mit 0x7A.... bzw 80..... ? + if ( p_frame[pos_SondeSN+1] ) + { + get_FrameNb(); + get_GPStime(); + get_SondeSN(); + if (option_verbose) printf(" (%7d) ", gpx.sn); + printf(" [%5d] ", gpx.frnr); + // + 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_GPSvel16(); + 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"); + } + } +} + +int blk_pos = SYNC_LEN; +int frm_pos = 0; +int sf = 0; + +void proc_frame(int len) { + + 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) blk_rawbits[len++] = '0'; + } + //if (len > RAWBITFRAME_LEN+OVERLAP*BITS*2) len = RAWBITFRAME_LEN+OVERLAP*BITS*2; + //for (i = len; i < RAWBITFRAME_LEN+OVERLAP*BITS*2; i++) frame_rawbits[i] = 0; // oder: '0' + blk_rawbits[len] = '\0'; + + flen = len / (2*BITS); + + if (option_vit == 1) { + viterbi(blk_rawbits); + rawbits = vit_rawbits; + } + else if (option_vit == 2) { + viterbi_soft(soft_rawbits, len); + rawbits = vits_rawbits; + } + else rawbits = 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 < flen; j++) block_bytes[j] = 0; + + sf = 0; + blk_pos = SYNC_LEN; + for (j = 0; j < 4; j++) sf += (block_bytes[SYNC_LEN+j] == frm_sync[j]); + if (sf < 4) { // scan 1..40 ? + sf = 0; + for (j = 0; j < 4; j++) sf += (block_bytes[SYNC_LEN+35+j] == frm_sync[j]); + if (sf == 4) blk_pos = SYNC_LEN+35; + else { + sf = 0; + for (j = 0; j < 4; j++) sf += (block_bytes[SYNC_LEN+40+j] == frm_sync[j]); + if (sf == 4) blk_pos = SYNC_LEN+40; // 300-260 + } + } + + if (blen > 100 && option_ecc) { + for (j = 0; j < rs_N; j++) rs_cw[rs_N-1-j] = block_bytes[blk_pos+j]; + errs = lms6_ecc(rs_cw); + for (j = 0; j < rs_N; j++) block_bytes[blk_pos+j] = rs_cw[rs_N-1-j]; + } + + if (option_raw == 2) { + for (i = 0; i < flen; i++) printf("%02x ", block_bytes[i]); + if (blen > 100 && option_ecc) printf("(%d)", errs); + printf("\n"); + } + else if (option_raw == 4 && option_ecc && blen > 100) { + for (i = 0; i < rs_N; i++) printf("%02x", block_bytes[blk_pos+i]); + printf(" (%d)", errs); + printf("\n"); + } + else if (option_raw == 8) { + if (option_vit) { + for (i = 0; i < len; i++) printf("%c", vit_rawbits[i]); printf("\n"); + } + else { + for (i = 0; i < len; i++) printf("%c", blk_rawbits[i]); printf("\n"); + } + } + + for (j = 0; j < rs_K; j++) frame[j] = block_bytes[blk_pos+j]; + + crc_err = check_CRC(p_frame); + + if (option_raw == 1) { + for (i = 0; i < FRM_LEN; i++) printf("%02x ", p_frame[i]); + if (crc_err==0) printf(" [OK]"); else printf(" [NO]"); + printf("\n"); + } + + if (option_raw == 0) print_frame(crc_err, len); + +} + + +int main(int argc, char **argv) { + + FILE *fp = NULL; + char *fpname = NULL; + float spb = 0.0; + int header_found = 0; + + int bit, rbit; + int bitpos = 0; + int bitQ; + int pos; + int herrs, herr1; + int headerlen = 0; + + int k,K; + float mv; + unsigned int mv_pos, mv0_pos; + int mp = 0; + + float thres = 0.76; + + int bitofs = 0; + int symlen = 1; + unsigned int bc = 0; + + float sb = 0.0; + float sbit = 0.0; + float level = -1.0, ll = -1.0; + + +#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,--vit2 (Viterbi/soft)\n"); + fprintf(stderr, " --ecc (Reed-Solomon)\n"); + return 0; + } + else if ( (strcmp(*argv, "-v") == 0) || (strcmp(*argv, "--verbose") == 0) ) { + option_verbose = 1; + } + else if ( (strcmp(*argv, "-r") == 0) || (strcmp(*argv, "--raw") == 0) ) { + option_raw = 1; // bytes - rs_ecc_codewords + } + else if ( (strcmp(*argv, "-r0") == 0) || (strcmp(*argv, "--raw0") == 0) ) { + option_raw = 2; // bytes: sync + codewords + } + else if ( (strcmp(*argv, "-rc") == 0) || (strcmp(*argv, "--rawecc") == 0) ) { + option_raw = 4; // rs_ecc_codewords + } + else if ( (strcmp(*argv, "-R") == 0) || (strcmp(*argv, "--RAW") == 0) ) { + option_raw = 8; // rawbits + } + else if (strcmp(*argv, "--ecc" ) == 0) { option_ecc = 1; } // RS-ECC + else if (strcmp(*argv, "--vit" ) == 0) { option_vit = 1; } // viterbi-hard + else if (strcmp(*argv, "--vit2") == 0) { option_vit = 2; } // viterbi-soft + else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) { + option_inv = 1; + } + else if ( (strcmp(*argv, "--dc") == 0) ) { + option_dc = 1; + } + else if ( (strcmp(*argv, "--ch2") == 0) ) { wav_channel = 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, "--level") == 0) ) { + ++argv; + if (*argv) { + ll = atof(*argv); + } + else return -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; + + + spb = read_wav_header(fp, (float)BAUD_RATE, wav_channel); + if ( spb < 0 ) { + fclose(fp); + fprintf(stderr, "error: wav header\n"); + return -1; + } + if ( spb < 8 ) { + fprintf(stderr, "note: sample rate low\n"); + } + + + if (option_raw == 4) option_ecc = 1; + + if (option_vit) { + vit_initCodes(); + } + if (option_ecc) { + rs_init_RS255ccsds(); // bch_ecc.c + } + + + symlen = 1; + headerlen = strlen(rawheader); + bitofs = 1; // +1 .. +2 + K = init_buffers(rawheader, headerlen, 2); // shape=2 (alt. shape=1) + if ( K < 0 ) { + fprintf(stderr, "error: init buffers\n"); + return -1; + }; + + level = ll; + k = 0; + mv = -1; mv_pos = 0; + + while ( f32buf_sample(fp, option_inv, 1) != EOF ) { + + k += 1; + if (k >= K-4) { + mv0_pos = mv_pos; + mp = getCorrDFT(-1, K, 0, &mv, &mv_pos); + k = 0; + } + else { + mv = 0.0; + continue; + } + + if (mp > 0 && (mv > thres || mv < -thres)) { + if (mv_pos > mv0_pos) { + + header_found = 0; + herrs = headcmp(symlen, rawheader, headerlen, mv_pos, mv<0, option_dc); // (symlen=1) + herr1 = 0; + + if (herrs <= 3 && herrs > 0) { + herr1 = headcmp(symlen, rawheader, headerlen, mv_pos+1, mv<0, option_dc); + if (herr1 < herrs) { + herrs = herr1; + herr1 = 1; + } + } + if (herrs <= 3) header_found = 1; // herrs <= 3 bitfehler in header + + if (header_found) { + + if (ll <= 0) level = header_level(rawheader, headerlen, mv_pos, mv<0) * 0.6; + + bitpos = 0; + pos = BLOCKSTART; + + if (mv > 0) bc = 0; else bc = 1; + + while ( pos < RAWBITBLOCK_LEN ) { + header_found = !(pos>=RAWBITBLOCK_LEN-10); + //bitQ = read_sbit(fp, symlen, &rbit, option_inv, bitofs, bitpos==0, !header_found); // symlen=1, return: zeroX/bit + bitQ = read_softbit(fp, symlen, &rbit, &sb, level, option_inv, bitofs, bitpos==0, !header_found); // symlen=1, return: zeroX/bit + if (bitQ == EOF) { break; } + + bit = rbit ^ (bc%2); // (c0,inv(c1)) + blk_rawbits[pos] = 0x30 + bit; + + sbit = sb * (-(int)(bc%2)*2+1); + soft_rawbits[pos] = sbit; + + bc++; + pos++; + bitpos += 1; + } + + blk_rawbits[pos] = '\0'; + soft_rawbits[pos] = 0; + + proc_frame(pos); + + if (pos < RAWBITBLOCK_LEN) break; + + pos = BLOCKSTART; + header_found = 0; + } + } + } + + } + + + free_buffers(); + + fclose(fp); + + return 0; +} + diff --git a/lms6/lmsX2446.c b/lms6/lmsX2446.c index a7e3611..c8799af 100644 --- a/lms6/lmsX2446.c +++ b/lms6/lmsX2446.c @@ -8,6 +8,7 @@ */ #include +#include // atof() #include #include @@ -28,12 +29,11 @@ int option_verbose = 0, // ausfuehrliche Anzeige option_res = 0, // genauere Bitmessung wavloaded = 0; -int option_baud = 0; -//int option_nmea = 0; +float baudrate = -1; /* -------------------------------------------------------------------------- */ -#define BAUD_RATE (4800) // 4797.7 = 4800 / (48023/48000) ? +#define BAUD_RATE (4797.7) // 4797.7 = 4800 / (48023/48000) ? int sample_rate = 0, bits_sample = 0, channels = 0; float samples_per_bit = 0; @@ -905,8 +905,17 @@ void proc_frame(int len) { sf = 0; blk_pos = SYNC_LEN; - for (j = 0; j < 4; j++) sf += (block_bytes[blk_pos+40+j] == frm_sync[j]); - if (sf == 4) blk_pos += 40; // 300-260 + for (j = 0; j < 4; j++) sf += (block_bytes[SYNC_LEN+j] == frm_sync[j]); + if (sf < 4) { // scan 1..40 ? + sf = 0; + for (j = 0; j < 4; j++) sf += (block_bytes[SYNC_LEN+35+j] == frm_sync[j]); + if (sf == 4) blk_pos = SYNC_LEN+35; + else { + sf = 0; + for (j = 0; j < 4; j++) sf += (block_bytes[SYNC_LEN+40+j] == frm_sync[j]); + if (sf == 4) blk_pos = SYNC_LEN+40; // 300-260 + } + } if (blen > 100 && option_ecc) { for (j = 0; j < rs_N; j++) rs_cw[rs_N-1-j] = block_bytes[blk_pos+j]; @@ -988,7 +997,14 @@ int main(int argc, char **argv) { } else if (strcmp(*argv, "--ecc" ) == 0) { option_ecc = 1; } // RS-ECC else if (strcmp(*argv, "--vit" ) == 0) { option_vit = 1; } // viterbi-hard - else if (strcmp(*argv, "--baud") == 0) { option_baud = 1; } // test + else if ( (strcmp(*argv, "--br") == 0) ) { + ++argv; + if (*argv) { + baudrate = atof(*argv); + if (baudrate < 4000 || baudrate > 6000) baudrate = 4800; // default: 4797.7 + } + else return -1; + } //else if (strcmp(*argv, "--nmea") == 0) { option_nmea = 1; } // test else if ( (strcmp(*argv, "-i") == 0) || (strcmp(*argv, "--invert") == 0) ) { option_inv = 1; @@ -1012,8 +1028,8 @@ int main(int argc, char **argv) { fclose(fp); return -1; } - if (option_baud) { - samples_per_bit *= 48023/48000.0; + if (baudrate > 0) { + samples_per_bit = sample_rate/baudrate; // default baudrate: 4800 * 48000/48023.0 fprintf(stderr, "sps corr: %.4f\n", samples_per_bit); }