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radiosonde_auto_rx/rs_module/rs_rs41.c

897 wiersze
24 KiB
C
Czysty Wina Historia

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "rs_data.h"
#include "rs_datum.h"
#include "rs_bch_ecc.h"
/*
Vaisala data whitening
LFSR: ab i=8 (mod 64):
m[16+i] = m[i] ^ m[i+2] ^ m[i+4] ^ m[i+6]
________________3205590EF944C6262160C2EA795D6DA15469470CDCE85CF1
F776827F0799A22C937C3063F5102E61D0BCB4B606AAF423786E3BAEBF7B4CC196833E51B1490898
uint16 y[]:
y[i+8] = y[i] ^ y[i+1] ^ y[i+2] ^ y[i+3]
*/
#define MASK_LEN 64
static
ui8_t mask[MASK_LEN] = { 0x96, 0x83, 0x3E, 0x51, 0xB1, 0x49, 0x08, 0x98,
0x32, 0x05, 0x59, 0x0E, 0xF9, 0x44, 0xC6, 0x26,
0x21, 0x60, 0xC2, 0xEA, 0x79, 0x5D, 0x6D, 0xA1,
0x54, 0x69, 0x47, 0x0C, 0xDC, 0xE8, 0x5C, 0xF1,
0xF7, 0x76, 0x82, 0x7F, 0x07, 0x99, 0xA2, 0x2C,
0x93, 0x7C, 0x30, 0x63, 0xF5, 0x10, 0x2E, 0x61,
0xD0, 0xBC, 0xB4, 0xB6, 0x06, 0xAA, 0xF4, 0x23,
0x78, 0x6E, 0x3B, 0xAE, 0xBF, 0x7B, 0x4C, 0xC1};
static // 10 B6 CA 11 22 96 12 F8 |
char headerbits_rs41[] = "0000100001101101010100111000100001000100011010010100100000011111";
static
ui8_t headerbytes_rs41[] = { 0x86, 0x35, 0xf4, 0x40, 0x93, 0xdf, 0x1a, 0x60}; // = xorbyte(xframe)
//xframe[] = { 0x10, 0xB6, 0xCA, 0x11, 0x22, 0x96, 0x12, 0xF8} = xorbyte( frame)
#define NDATA_LEN 320 // std framelen 320
#define XDATA_LEN 198
#define FRAME_LEN (NDATA_LEN+XDATA_LEN) // max framelen 518
#define BAUD 4800
#define BITS 8
#define BITFRAME_LEN (FRAME_LEN*BITS)
#define RAWBITFRAME_LEN (BITFRAME_LEN)
// -------------------------------------------------------------
static ui32_t u4(ui8_t *bytes) { // 32bit unsigned int
ui32_t val = 0;
memcpy(&val, bytes, 4);
// val = bytes[0] | (bytes[1]<<8) | (bytes[2]<<16) | (bytes[3]<<24);
return val;
}
static ui32_t u3(ui8_t *bytes) { // 24bit unsigned int
int val24 = 0;
val24 = bytes[0] | (bytes[1]<<8) | (bytes[2]<<16);
// = memcpy(&val, bytes, 3), val &= 0x00FFFFFF;
return val24;
}
static ui32_t u2(ui8_t *bytes) { // 16bit unsigned int
return bytes[0] | (bytes[1]<<8);
}
static int i3(ui8_t *bytes) { // 24bit signed int
int val = 0,
val24 = 0;
val = bytes[0] | (bytes[1]<<8) | (bytes[2]<<16);
val24 = val & 0xFFFFFF; if (val24 & 0x800000) val24 -= 0x1000000;
return val24;
}
static int crc16(ui8_t bytes[], int len) {
int crc16poly = 0x1021;
int rem = 0xFFFF, i, j;
int byte;
//if (start+len >= FRAME_LEN) return -1;
for (i = 0; i < len; i++) {
byte = bytes[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;
}
// -------------------------------------------------------------
static ui32_t rs41_check_CRC(rs_data_t *rs_data, ui32_t pos, ui32_t pck) {
ui32_t crclen = 0,
crcdat = 0;
int ret = 0;
// ((frame[pos]<<8) | frame[pos+1]) != pck ? // caution: variable block length
if ( rs_data->frame_bytes[pos] != ((pck>>8) & 0xFF) ) {
ret = 0x10000;
}
crclen = rs_data->frame_bytes[pos+1];
if (pos + crclen + 4 > rs_data->frame_len) ret |= 1;
else {
crcdat = u2((rs_data->frame_bytes)+pos+2+crclen);
if ( crcdat != crc16((rs_data->frame_bytes)+pos+2, crclen) ) {
ret |= 1; // CRC NO
}
//else { }; // CRC OK
}
return ret;
}
// -------------------------------------------------------------
/*
Pos: SubHeader, 1+1 byte (ID+LEN)
0x039: 7928 FrameNumber+SondeID
+(0x050: 0732 CalFrames 0x00..0x32)
0x065: 7A2A PTU
0x093: 7C1E GPS1: RXM-RAW (0x02 0x10) Week, TOW, Sats
0x0B5: 7D59 GPS2: RXM-RAW (0x02 0x10) pseudorange, doppler
0x112: 7B15 GPS3: NAV-SOL (0x01 0x06) ECEF-POS, ECEF-VEL
0x12B: 7611 00
0x12B: 7Exx AUX-xdata
*/
#define crc_FRAME (1<<0)
#define xor_FRAME 0x1713 // ^0x6E3B=0x7928
#define pck_FRAME 0x7928
#define pos_FRAME 0x039
#define pos_FrameNb 0x03B // 2 byte
#define pos_SondeID 0x03D // 8 byte
#define pos_CalData 0x052 // 1 byte, counter 0x00..0x32
#define pos_Calfreq 0x055 // 2 byte, calfr 0x00
#define pos_Calburst 0x05E // 1 byte, calfr 0x02
// ? #define pos_Caltimer 0x05A // 2 byte, calfr 0x02 ?
#define pos_CalRSTyp 0x05B // 8 byte, calfr 0x21 (+2 byte in 0x22?)
// weitere chars in calfr 0x22/0x23; weitere ID
#define crc_PTU (1<<1)
#define pck_PTU 0x7A2A // PTU
#define pos_PTU 0x065
#define crc_GPS1 (1<<2)
#define xor_GPS1 0x9667 // ^0xEA79=0x7C1E
#define pck_GPS1 0x7C1E // RXM-RAW (0x02 0x10)
#define pos_GPS1 0x093
#define pos_GPSweek 0x095 // 2 byte
#define pos_GPSiTOW 0x097 // 4 byte
#define pos_satsN 0x09B // 12x2 byte (1: SV, 1: quality,strength)
#define crc_GPS2 (1<<3)
#define pck_GPS2 0x7D59 // RXM-RAW (0x02 0x10)
#define pos_GPS2 0x0B5
#define pos_minPR 0x0B7 // 4 byte
#define pos_FF 0x0BB // 1 byte
#define pos_dataSats 0x0BC // 12x(4+3) byte (4: pseudorange, 3: doppler)
#define crc_GPS3 (1<<4)
#define xor_GPS3 0xB9FF // ^0xC2EA=0x7B15
#define pck_GPS3 0x7B15 // NAV-SOL (0x01 0x06)
#define pos_GPS3 0x112
#define pos_GPSecefP 0x114 // 3*4 byte ecefX,ecefY,ecefZ
#define pos_GPSecefV 0x120 // 3*2 byte
#define pos_numSats 0x126 // 1 byte
#define pos_sAcc 0x127 // 1 byte
#define pos_pDOP 0x128 // 1 byte
#define crc_AUX (1<<5)
#define pck_AUX 0x7E00 // LEN variable
#define pos_AUX 0x12B
#define crc_ZERO (1<<6) // LEN variable
#define pck_ZERO 0x7600
static addData_Vaisala_t rs41_addData;
static double c = 299.792458e6;
static double L1 = 1575.42e6;
static int rs41_get_SatData(rs_data_t *rs_data, int verbose) {
int i, n;
int sv;
ui32_t minPR;
int Nfix;
double pDOP, sAcc;
ui32_t tow;
ui32_t ecefP[3];
i16_t ecefV[3];
ui8_t *frame = rs_data->frame_bytes;
addData_Vaisala_t *rs41_add = rs_data->addData;
tow = u4(frame+pos_GPSiTOW);
minPR = u4(frame+pos_minPR);
(rs41_add->sat).tow = tow;
for (i = 0; i < 12; i++) {
n = i*7;
sv = frame[pos_satsN+2*i];
if (sv == 0xFF) break;
(rs41_add->sat).prn[i] = sv;
(rs41_add->sat).pseudorange[i] = u4(frame+pos_dataSats+n)/100.0 + minPR;
(rs41_add->sat).doppler[i] = -i3(frame+pos_dataSats+n+4)/100.0*L1/c;
}
n = i;
for (i = n; i < 12; i++) {
(rs41_add->sat).prn[i] = 0;
(rs41_add->sat).pseudorange[i] = 0.0;
(rs41_add->sat).doppler[i] = 0.0;
i++;
}
// ECEF-pos
for (i = 0; i < 3; i++) {
ecefP[i] = (i32_t)u4(frame+pos_GPSecefP+4*i);
(rs41_add->sat).pos_ecef[i] = ecefP[i] / 100.0;
}
// ECEF-vel
for (i = 0; i < 3; i++) {
ecefV[i] = (i16_t)u2(frame+pos_GPSecefV+2*i);
(rs41_add->sat).vel_ecef[i] = ecefV[i] / 100.0;
}
Nfix = frame[pos_numSats];
sAcc = frame[pos_sAcc]/10.0;
pDOP = frame[pos_pDOP]/10.0;
(rs41_add->sat).Nfix = Nfix;
(rs41_add->sat).pDOP = pDOP;
(rs41_add->sat).sAcc = sAcc;
if (verbose) {
fprintf(stdout, "[%5d]\n", u2(frame+pos_FrameNb));
fprintf(stdout, "iTOW: 0x%08X", tow);
fprintf(stdout, " week: 0x%04X", u2(frame+pos_GPSweek));
fprintf(stdout, "\n");
fprintf(stdout, "minPR: %d", minPR);
fprintf(stdout, "\n");
for (i = 0; i < n; i++) {
fprintf(stdout, " SV: %2d # ", (rs41_add->sat).prn[i]);
fprintf(stdout, "prMes: %.1f", (rs41_add->sat).pseudorange[i]);
fprintf(stdout, " ");
fprintf(stdout, "doMes: %.1f", (rs41_add->sat).doppler[i]);
fprintf(stdout, "\n");
}
fprintf(stdout, "ECEF-POS: (%d,%d,%d)\n", ecefP[0], ecefP[1], ecefP[2]);
fprintf(stdout, "ECEF-VEL: (%d,%d,%d)\n", ecefV[0], ecefV[1], ecefV[2]);
fprintf(stdout, "numSatsFix: %2d sAcc: %.1f pDOP: %.1f\n", Nfix, sAcc, pDOP);
fprintf(stdout, "CRC: ");
fprintf(stdout, " %04X", pck_GPS1);
if (rs41_check_CRC(rs_data, pos_GPS1, pck_GPS1)==0) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
fprintf(stdout, " %04X", pck_GPS2);
if (rs41_check_CRC(rs_data, pos_GPS2, pck_GPS2)==0) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
fprintf(stdout, " %04X", pck_GPS3);
if (rs41_check_CRC(rs_data, pos_GPS3, pck_GPS3)==0) fprintf(stdout, "[OK]"); else fprintf(stdout, "[NO]");
fprintf(stdout, "\n");
}
return 0;
}
static int rs41_get_FrameNb(rs_data_t *rs_data) {
ui8_t *frnr_bytes = NULL;
frnr_bytes = (rs_data->frame_bytes)+pos_FrameNb;
rs_data->frnr = frnr_bytes[0] | (frnr_bytes[1] << 8);
return 0;
}
static int rs41_get_SondeID(rs_data_t *rs_data) {
int i;
ui8_t byte;
ui8_t sondeid_bytes[8];
for (i = 0; i < 8; i++) {
byte = rs_data->frame_bytes[pos_SondeID + i];
if ((byte < 0x20) || (byte > 0x7E)) return -1;
sondeid_bytes[i] = byte;
}
for (i = 0; i < 8; i++) {
rs_data->SN[i] = sondeid_bytes[i];
}
rs_data->SN[8] = '\0';
return 0;
}
#define LEN_CAL 16
static int rs41_get_Cal(rs_data_t *rs_data, int verbose) {
int i;
unsigned byte;
ui8_t calfr = 0;
ui8_t burst = 0;
ui16_t fw = 0;
int freq = 0, f0 = 0, f1 = 0;
char sondetyp[9];
int crc = 0;
ui8_t *frame = rs_data->frame_bytes;
ui8_t *calbytes = rs_data->frame_bytes+pos_CalData+1;
addData_Vaisala_t *rs41_cal = rs_data->addData;
calfr = frame[pos_CalData];
crc = rs41_check_CRC(rs_data, pos_FRAME, pck_FRAME);
if (crc==0 && strncmp(rs41_cal->SN, rs_data->SN, 8)!=0) {
memset(rs41_cal, 0, sizeof(*rs41_cal));
strncpy(rs41_cal->SN, rs_data->SN, 9);
}
if (crc == 0) {
if (rs41_cal->bytes[calfr][LEN_CAL] == 0) {
for (i = 0; i < LEN_CAL; i++) {
rs41_cal->bytes[calfr][i] = calbytes[i];
}
rs41_cal->bytes[calfr][LEN_CAL] = 1;
}
}
if (calfr == 0x00) {
byte = frame[pos_Calfreq] & 0xC0; // erstmal nur oberste beiden bits
f0 = (byte * 10) / 64; // 0x80 -> 1/2, 0x40 -> 1/4 ; dann mal 40
byte = frame[pos_Calfreq+1];
f1 = 40 * byte;
freq = 400000 + f1+f0; // kHz;
if (crc == 0) rs_data->freq = freq; // crc == rs_data->crc & crc_FRAME
}
if (calfr == 0x01) {
fw = frame[pos_CalData+6] | (frame[pos_CalData+7]<<8);
}
if (calfr == 0x02) {
byte = frame[pos_Calburst];
burst = byte; // fw >= 0x4ef5, BK irrelevant? (killtimer in 0x31?)
}
if (calfr == 0x21) { // eventuell noch zwei bytes in 0x22
for (i = 0; i < 9; i++) sondetyp[i] = 0;
for (i = 0; i < 8; i++) {
byte = frame[pos_CalRSTyp + i];
if ((byte >= 0x20) && (byte < 0x7F)) sondetyp[i] = byte;
else if (byte == 0x00) sondetyp[i] = '\0';
}
}
if (verbose) {
fprintf(stdout, "[%5d] ", rs_data->frnr);
fprintf(stdout, "0x%02x: ", calfr);
for (i = 0; i < LEN_CAL; i++) {
fprintf(stdout, "%02x ", calbytes[i]);
}
if (crc == 0) fprintf(stdout, "[OK]");
else fprintf(stdout, "[NO]");
fprintf(stdout, " ");
switch (calfr) {
case 0x00: fprintf(stdout, ": fq %d ", freq); break;
case 0x01: fprintf(stdout, ": fw 0x%04x ", fw); break;
case 0x02: fprintf(stdout, ": BK %02X ", burst); break;
case 0x21: fprintf(stdout, ": %s ", sondetyp); break;
}
fprintf(stdout, "\n");
}
return 0;
}
static int rs41_get_PTUmeas(rs_data_t *rs_data) {
int i;
ui32_t measdata[12];
ui8_t *frame = rs_data->frame_bytes;
// 4*3 (u)int24
for (i = 0; i < 12; i++) {
measdata[i] = u3(frame+pos_PTU+2+3*i);
}
if (0) {
printf("\n");
printf("1: %8d %8d %8d", measdata[ 0], measdata[ 1], measdata[ 2]); // T?
printf(" # ");
printf("2: %8d %8d %8d", measdata[ 3], measdata[ 4], measdata[ 5]); // H1?
printf(" # ");
printf("3: %8d %8d %8d", measdata[ 6], measdata[ 7], measdata[ 8]); // H2?
printf(" # ");
printf("4: %8d %8d %8d", measdata[ 9], measdata[10], measdata[11]); // P?
printf("\n");
}
// calibration data: float32 poly-coeffs in cal/conf-blocks
return 0;
}
static int rs41_get_GPSweek(rs_data_t *rs_data) {
ui8_t *gpsweek_bytes;
int gpsweek;
gpsweek_bytes = (rs_data->frame_bytes)+pos_GPSweek;
gpsweek = gpsweek_bytes[0] + (gpsweek_bytes[1] << 8);
//if (gpsweek < 0) { rs_data->week = -1; return -1; } // (short int)
(rs_data->GPS).week = gpsweek;
return 0;
}
static int rs41_get_GPStime(rs_data_t *rs_data) {
ui8_t *gpstime_bytes;
ui32_t gpstime = 0, // 32bit
day, ms;
gpstime_bytes = (rs_data->frame_bytes)+pos_GPSiTOW;
memcpy(&gpstime, gpstime_bytes, 4);
(rs_data->GPS).msec = gpstime;
ms = gpstime % 1000;
gpstime /= 1000;
day = (gpstime / (24 * 3600)) % 7;
rs_data->wday = day;
gpstime %= (24*3600);
rs_data->hr = gpstime / 3600;
rs_data->min = (gpstime % 3600) / 60;
rs_data->sec = gpstime % 60 + ms/1000.0;
return 0;
}
#define EARTH_a 6378137.0
#define EARTH_b 6356752.31424518
#define EARTH_a2_b2 (EARTH_a*EARTH_a - EARTH_b*EARTH_b)
static double a = EARTH_a,
b = EARTH_b,
//a_b = EARTH_a2_b2,
e2 = EARTH_a2_b2 / (EARTH_a*EARTH_a),
ee2 = EARTH_a2_b2 / (EARTH_b*EARTH_b);
static int ecef2elli(double X[], double *lat, double *lon, double *alt) {
double phi, lam, R, p, t;
lam = atan2( X[1] , X[0] );
p = sqrt( X[0]*X[0] + X[1]*X[1] );
t = atan2( X[2]*a , p*b );
phi = atan2( X[2] + ee2 * b * sin(t)*sin(t)*sin(t) ,
p - e2 * a * cos(t)*cos(t)*cos(t) );
R = a / sqrt( 1 - e2*sin(phi)*sin(phi) );
*alt = p / cos(phi) - R;
*lat = phi*180.0/M_PI;
*lon = lam*180.0/M_PI;
return 0;
}
static int rs41_get_GPSkoord(rs_data_t *rs_data) {
int k;
ui8_t *gpsPos = NULL;
int XYZ; // signed 32bit
double P[3], lat, lon, alt;
ui8_t *gpsVel = NULL;
short vel16; // signed 16bit
double V[3], phi, lam, dir;
int ret = 0;
ui8_t *frame = rs_data->frame_bytes;
for (k = 0; k < 3; k++) {
gpsPos = frame + pos_GPSecefP + 4*k;
memcpy(&XYZ, gpsPos, 4);
P[k] = XYZ / 100.0;
gpsVel = frame + pos_GPSecefV + 2*k;
vel16 = gpsVel[0] | gpsVel[1] << 8;
V[k] = vel16 / 100.0;
}
// ECEF-Position
ecef2elli(P, &lat, &lon, &alt);
(rs_data->GPS).lat = lat;
(rs_data->GPS).lon = lon;
(rs_data->GPS).alt = alt;
if ((alt < -1000) || (alt > 80000)) ret = -3;
// ECEF-Velocities
// ECEF-Vel -> NorthEastUp
phi = lat*M_PI/180.0;
lam = lon*M_PI/180.0;
(rs_data->GPS).vN = -V[0]*sin(phi)*cos(lam) - V[1]*sin(phi)*sin(lam) + V[2]*cos(phi);
(rs_data->GPS).vE = -V[0]*sin(lam) + V[1]*cos(lam);
(rs_data->GPS).vU = V[0]*cos(phi)*cos(lam) + V[1]*cos(phi)*sin(lam) + V[2]*sin(phi);
// NEU -> HorDirVer
(rs_data->GPS).vH = sqrt((rs_data->GPS).vN*(rs_data->GPS).vN + (rs_data->GPS).vE*(rs_data->GPS).vE);
/*
double alpha;
alpha = atan2(gpx.vN, gpx.vE)*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((rs_data->GPS).vE, (rs_data->GPS).vN) * 180.0 / M_PI;
if (dir < 0) dir += 360.0;
(rs_data->GPS).vD = dir;
return ret;
}
// -------------------------------------------------------------
static int rs41_get_FrameConf(rs_data_t *rs_data, int verbose) {
int err;
err = rs41_check_CRC(rs_data, pos_FRAME, pck_FRAME);
if (err) rs_data->crc |= crc_FRAME;
rs41_get_FrameNb(rs_data);
rs41_get_SondeID(rs_data);
rs41_get_Cal(rs_data, verbose);
return err;
}
static int rs41_get_PTU(rs_data_t *rs_data) {
int err;
err = rs41_check_CRC(rs_data, pos_PTU, pck_PTU);
if (err) rs_data->crc |= crc_PTU;
//else
{
rs41_get_PTUmeas(rs_data);
}
return err;
}
static int rs41_get_GPS1(rs_data_t *rs_data) {
int err;
err = rs41_check_CRC(rs_data, pos_GPS1, pck_GPS1);
if (err) rs_data->crc |= crc_GPS1;
//else
{
rs41_get_GPSweek(rs_data);
rs41_get_GPStime(rs_data);
}
Gps2Date(rs_data);
return err;
}
static int rs41_get_GPS2(rs_data_t *rs_data, int verbose) {
int err;
err = rs41_check_CRC(rs_data, pos_GPS2, pck_GPS2);
if (err) rs_data->crc |= crc_GPS2;
rs41_get_SatData(rs_data, verbose);
return err;
}
static int rs41_get_GPS3(rs_data_t *rs_data) {
int err;
err = rs41_check_CRC(rs_data, pos_GPS3, pck_GPS3);
if (err) rs_data->crc |= crc_GPS3;
rs41_get_GPSkoord(rs_data);
return err;
}
static int rs41_get_Aux(rs_data_t *rs_data) {
//
// "Ozone Sounding with Vaisala Radiosonde RS41" user's guide
//
int i, auxlen, auxcrc, count7E, pos7E, err;
ui8_t *frame = rs_data->frame_bytes;
count7E = 0;
pos7E = pos_AUX;
// 7Exx: xdata
while ( pos7E < rs_data->frame_len && frame[pos7E] == 0x7E ) {
auxlen = frame[pos7E+1];
auxcrc = frame[pos7E+2+auxlen] | (frame[pos7E+2+auxlen+1]<<8);
if (count7E == 0) fprintf(stdout, "# xdata = ");
else fprintf(stdout, " # ");
err = rs41_check_CRC(rs_data, pos7E, frame[pos7E]);
if (err) rs_data->crc |= crc_AUX;
if ( auxcrc == crc16(frame+pos7E+2, auxlen) ) {
//fprintf(stdout, " # %02x : ", frame[pos_AUX+2]);
for (i = 1; i < auxlen; i++) {
fprintf(stdout, "%c", frame[pos7E+2+i]);
}
count7E++;
pos7E += 2+auxlen+2;
}
else pos7E = rs_data->frame_len;
}
if (count7E > 0) fprintf(stdout, "\n");
err = rs41_check_CRC(rs_data, pos7E, 0x7600);
if (err) rs_data->crc |= crc_ZERO;
return count7E;
}
// -------------------------------------------------------------
//
// Reed-Solomon error correction -------------------------------
//
rs_ecccfg_t cfg_rs41ecc = {
.typ= 41,
.msglen= (320-56)/2, // 132..231 <= rs_K=231
.msgpos= 56,
.parpos= 8,
.hdrlen= 8,
.frmlen= 320 // 320..518
};
#define rs_N 255
#define rs_R 24
#define rs_K (rs_N-rs_R)
static int rs41_ecc(rs_data_t *rs_data) {
// richtige framelen wichtig fuer 0-padding
int i, leak, ret = 0;
int errors1, errors2;
ui8_t cw1[rs_N], cw2[rs_N];
ui8_t err_pos1[rs_R], err_pos2[rs_R],
err_val1[rs_R], err_val2[rs_R];
ui32_t frmlen = rs_data->pos;
ui8_t *frame = rs_data->frame_bytes;
// frmlen <= cfg_rs41ecc.frmlen; // = 518
if (frmlen > rs_data->frame_len) frmlen = rs_data->frame_len;
cfg_rs41ecc.frmlen = frmlen;
cfg_rs41ecc.msglen = (frmlen-cfg_rs41ecc.msgpos)/2; // msgpos=56;
leak = frmlen % 2;
for (i = frmlen; i < rs_data->frame_len; i++) frame[i] = 0; // FRAME_LEN-HDR = 510 = 2*255
// memset(cw1/2, 0, rs_N);
for (i = 0; i < rs_R; i++) cw1[i] = frame[cfg_rs41ecc.parpos+i ];
for (i = 0; i < rs_R; i++) cw2[i] = frame[cfg_rs41ecc.parpos+i+rs_R];
for (i = 0; i < rs_K; i++) cw1[rs_R+i] = frame[cfg_rs41ecc.msgpos+2*i ];
for (i = 0; i < rs_K; i++) cw2[rs_R+i] = frame[cfg_rs41ecc.msgpos+2*i+1];
errors1 = rs_decode(cw1, err_pos1, err_val1);
errors2 = rs_decode(cw2, err_pos2, err_val2);
// Wenn Fehler im 00-padding korrigiert wurden,
// war entweder der frame zu kurz, oder
// Fehler wurden falsch korrigiert;
// allerdings ist bei t=12 die Wahrscheinlichkeit,
// dass falsch korrigiert wurde mit 1/t! sehr gering.
// check CRC32
// CRC32 OK:
//for (i = 0; i < cfg_rs41ecc.hdrlen; i++) frame[i] = data[i];
for (i = 0; i < rs_R; i++) {
frame[cfg_rs41ecc.parpos+ i] = cw1[i];
frame[cfg_rs41ecc.parpos+rs_R+i] = cw2[i];
}
for (i = 0; i < rs_K; i++) { // cfg_rs41ecc.msglen <= rs_K
frame[cfg_rs41ecc.msgpos+ 2*i] = cw1[rs_R+i];
frame[cfg_rs41ecc.msgpos+1+2*i] = cw2[rs_R+i];
}
if (leak) {
frame[cfg_rs41ecc.msgpos+2*i] = cw1[rs_R+i];
}
ret = errors1 + errors2;
if (errors1 < 0 || errors2 < 0) ret = -1;
return ret;
}
// -------------------------------------------------------------
//
// process bits/bytes
//
static int rs41_framebits2bytes(rs_data_t *rs_data) {
char *rawframebits = rs_data->frame_rawbits;
ui8_t *frame = rs_data->frame_bytes;
ui32_t n;
for (n = 0; n < rs_data->pos; n++) {
frame[n] = rs_data->bits2byte(rs_data, rawframebits+(BITS*n));
}
return 0;
}
int rs41_process(void *data, int raw, int options) {
rs_data_t *rs_data = data;
int err=0, ret=0;
ui32_t n;
if (rs_data->input < 8) {
rs41_framebits2bytes(rs_data);
}
for (n = rs_data->pos; n < rs_data->frame_len; n++) {
rs_data->frame_bytes[n] = 0;
}
rs_data->ecc = rs41_ecc(rs_data);
rs_data->crc = 0;
if ( !raw ) {
err = 0;
ret = 0;
ret = rs41_get_FrameConf(rs_data, options & 0x1);
err |= ret<<0;
ret = rs41_get_PTU(rs_data);
err |= ret<<1;
ret = rs41_get_GPS1(rs_data);
err |= ret<<2;
ret = rs41_get_GPS2(rs_data, (options>>8) & 0xFF);
err |= ret<<3;
ret = rs41_get_GPS3(rs_data);
err |= ret<<4;
if (options & 0x2) {
ret = rs41_get_Aux(rs_data);
// ret = count7E; // bei crc: err |= ret<<4;
}
}
return err;
}
int rs41_xbits2byte(void *data, char bits[]) {
// 0 eq '0'=0x30
// 1 eq '1'=0x31
rs_data_t *rs_data = data;
int i, byte=0, d=1;
for (i = 0; i < 8; i++) { // little endian
/* for (i = 7; i >= 0; i--) { // big endian */
if ((bits[i]&1) == 1) byte += d;
else if ((bits[i]&1) == 0) byte += 0;
//else return 0x100;
d <<= 1;
}
return byte ^ mask[rs_data->pos % MASK_LEN];
}
int init_rs41data(rs_data_t *rs_data) {
rs_init_RS255();
// int in = rs_data->input;
// memset(rs_data, 0, sizeof(rs_data_t));
// rs_data->input = in
rs_data->baud = BAUD;
rs_data->bits = BITS;
rs_data->header = calloc(sizeof(headerbits_rs41), 1);
if (rs_data->header == NULL) return ERROR_MALLOC;
strcpy(rs_data->header, headerbits_rs41);
rs_data->header_ofs = 24;
rs_data->header_len = 32;
rs_data->bufpos = -1;
rs_data->buf = calloc((rs_data->header_len)+1, 1);
if (rs_data->buf == NULL) return ERROR_MALLOC;
if (rs_data->input < 8) {
rs_data->frame_rawbits = calloc(RAWBITFRAME_LEN, 1);
if (rs_data->frame_rawbits == NULL) return ERROR_MALLOC;
strncpy(rs_data->frame_rawbits, headerbits_rs41, strlen(headerbits_rs41));
//rs_data->frame_bits = rs_data->frame_rawbits;
}
rs_data->frame_bytes = calloc(FRAME_LEN, 1);
if (rs_data->frame_bytes == NULL) return ERROR_MALLOC;
memcpy(rs_data->frame_bytes, headerbytes_rs41, sizeof(headerbytes_rs41));
rs_data->frame_start = (rs_data->header_ofs + rs_data->header_len) / rs_data->bits;
rs_data->pos_min = pos_AUX;
rs_data->frame_len = FRAME_LEN;
rs_data->bits2byte = rs41_xbits2byte;
rs_data->rs_process = rs41_process;
rs_data->addData = &rs41_addData;
return 0;
}
int free_rs41data(rs_data_t *rs_data) {
rs_data->header = NULL;
free(rs_data->buf);
rs_data->buf = NULL;
if (rs_data->input < 8) {
// memset(rs_data->frame_rawbits, 0, rs_data->RAWBITFRAME_LEN) ...
free(rs_data->frame_rawbits);
rs_data->frame_rawbits = NULL;
//rs_data->frame_bits = NULL;
}
// memset(rs_data->frame_bytes, 0, rs_data->FRAME_LEN) ...
free(rs_data->frame_bytes);
rs_data->frame_bytes = NULL;
//memset(rs_data, 0, sizeof(rs_data_t));
return 0;
}
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