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RadioSonde/libraries/SondeLib/RS41.cpp
Xavier cab552d78c first commit
2022-08-24 08:28:06 +02:00

557 lines
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/* RS41 decoder functions */
#include "RS41.h"
#include "SX1278FSK.h"
#include "rsc.h"
#include "Sonde.h"
#define RS41_DEBUG 0
#if RS41_DEBUG
#define RS41_DBG(x) x
#else
#define RS41_DBG(x)
#endif
#define RS41MAXLEN (320)
static byte data[800];
static int dpos = 0;
static uint16_t CRCTAB[256];
#define X2C_DIVR(a, b) ((b) != 0.0f ? (a)/(b) : (a))
#define X2C_DIVL(a, b) ((a)/(b))
static uint32_t X2C_LSH(uint32_t a, int32_t length, int32_t n)
{
uint32_t m;
m = 0;
m = (length == 32) ? 0xFFFFFFFFl : (1 << length) - 1;
if (n > 0) {
if (n >= (int32_t)length)
return 0;
return (a << n) & m;
}
if (n <= (int32_t)-length)
return 0;
return (a >> -n) & m;
}
static double atang2(double x, double y)
{
double w;
if (fabs(x)>fabs(y)) {
w = (double)atan((float)(X2C_DIVL(y,x)));
if (x<0.0) {
if (y>0.0) w = 3.1415926535898+w;
else w = w-3.1415926535898;
}
}
else if (y!=0.0) {
w = (double)(1.5707963267949f-atan((float)(X2C_DIVL(x,
y))));
if (y<0.0) w = w-3.1415926535898;
}
else w = 0.0;
return w;
} /* end atang2() */
static void Gencrctab(void)
{
uint16_t j;
uint16_t i;
uint16_t crc;
for (i = 0U; i<=255U; i++) {
crc = (uint16_t)(i*256U);
for (j = 0U; j<=7U; j++) {
if ((0x8000U & crc)) crc = X2C_LSH(crc,16,1)^0x1021U;
else crc = X2C_LSH(crc,16,1);
} /* end for */
CRCTAB[i] = X2C_LSH(crc,16,-8)|X2C_LSH(crc,16,8);
} /* end for */
} /* end Gencrctab() */
int RS41::setup(float frequency)
{
#if RS41_DEBUG
Serial.println("Setup sx1278 for RS41 sonde");
#endif
if(!initialized) {
Gencrctab();
initrsc();
initialized = true;
}
if(sx1278.ON()!=0) {
RS41_DBG(Serial.println("Setting SX1278 power on FAILED"));
return 1;
}
if(sx1278.setFSK()!=0) {
RS41_DBG(Serial.println("Setting FSK mode FAILED"));
return 1;
}
if(sx1278.setBitrate(4800)!=0) {
RS41_DBG(Serial.println("Setting bitrate 4800bit/s FAILED"));
return 1;
}
#if RS41_DEBUG
float br = sx1278.getBitrate();
Serial.print("Exact bitrate is ");
Serial.println(br);
#endif
if(sx1278.setAFCBandwidth(sonde.config.rs41.agcbw)!=0) {
RS41_DBG(Serial.printf("Setting AFC bandwidth %d Hz FAILED", sonde.config.rs41.agcbw));
return 1;
}
if(sx1278.setRxBandwidth(sonde.config.rs41.rxbw)!=0) {
RS41_DBG(Serial.printf("Setting RX bandwidth to %d Hz FAILED", sonde.config.rs41.rxbw));
return 1;
}
// Enable auto-AFC, auto-AGC, RX Trigger by preamble
if(sx1278.setRxConf(0x1E)!=0) {
RS41_DBG(Serial.println("Setting RX Config FAILED"));
return 1;
}
// Set autostart_RX to 01, preamble 0, SYNC detect==on, syncsize=3 (==4 byte
//char header[] = "0110.0101 0110.0110 1010.0101 1010.1010";
//const char *SYNC="\x10\xB6\xCA\x11\x22\x96\x12\xF8";
const char *SYNC="\x08\x6D\x53\x88\x44\x69\x48\x1F";
if(sx1278.setSyncConf(0x57, 8, (const uint8_t *)SYNC)!=0) {
RS41_DBG(Serial.println("Setting SYNC Config FAILED"));
return 1;
}
if(sx1278.setPreambleDetect(0xA8)!=0) {
RS41_DBG(Serial.println("Setting PreambleDetect FAILED"));
return 1;
}
// Packet config 1: fixed len, no mancecer, no crc, no address filter
// Packet config 2: packet mode, no home ctrl, no beackn, msb(packetlen)=0)
if(sx1278.setPacketConfig(0x08, 0x40)!=0) {
RS41_DBG(Serial.println("Setting Packet config FAILED"));
return 1;
}
Serial.print("RS41: setting RX frequency to ");
Serial.println(frequency);
int retval = sx1278.setFrequency(frequency);
dpos = 0;
#if RS41_DEBUG
RS41_DBG(Serial.println("Setting SX1278 config for RS41 finished\n"); Serial.println());
#endif
sx1278.clearIRQFlags();
// the following is already done in receivePacketTimeout()
// sx1278.setPayloadLength(RS41MAXLEN-8); // Expect 320-8 bytes or 518-8 bytes (8 byte header)
// sx1278.writeRegister(REG_OP_MODE, FSK_RX_MODE);
return retval;
}
uint32_t RS41::bits2val(const uint8_t *bits, int len) {
uint32_t val = 0;
for (int j = 0; j < len; j++) {
val |= (bits[j] << (len-1-j));
}
return val;
}
RS41::RS41() {
}
/* RS41 reed solomon decoder, from dxlAPRS
*/
static int32_t reedsolomon41(byte buf[], uint32_t buf_len, uint32_t len2)
{
uint32_t i;
int32_t res1;
/*tb1, */
int32_t res;
char b1[256];
char b[256];
uint32_t eraspos[24];
uint32_t tmp;
for (i = 0UL; i<=255UL; i++) {
b[i] = 0;
b1[i] = 0;
} /* end for */
tmp = len2;
i = 0UL;
if (i<=tmp) for (;; i++) {
b[230UL-i] = buf[i*2UL+56UL];
b1[230UL-i] = buf[i*2UL+57UL];
if (i==tmp) break;
} /* end for */
for (i = 0UL; i<=23UL; i++) {
b[254UL-i] = buf[i+8UL];
b1[254UL-i] = buf[i+32UL];
} /* end for */
res = decodersc(b, eraspos, 0);
res1 = decodersc(b1, eraspos, 0);
if (res>0L && res<=12L) {
tmp = len2;
i = 0UL;
if (i<=tmp) for (;; i++) {
buf[i*2UL+56UL] = b[230UL-i];
if (i==tmp) break;
} /* end for */
for (i = 0UL; i<=23UL; i++) {
buf[i+8UL] = b[254UL-i];
} /* end for */
}
if (res1>0L && res1<=12L) {
tmp = len2;
i = 0UL;
if (i<=tmp) for (;; i++) {
buf[i*2UL+57UL] = b1[230UL-i];
if (i==tmp) break;
} /* end for */
for (i = 0UL; i<=23UL; i++) {
buf[i+32UL] = b1[254UL-i];
} /* end for */
}
if (res<0L || res1<0L) return -1L;
else return res+res1;
return 0;
} /* end reedsolomon41() */
static char crcrs(const byte frame[], uint32_t frame_len,
int32_t from, int32_t to)
{
uint16_t crc;
int32_t i;
int32_t tmp;
crc = 0xFFFFU;
tmp = to-3L;
i = from;
if (i<=tmp) for (;; i++) {
crc = X2C_LSH(crc,16,-8)^CRCTAB[(uint32_t)((crc^(uint16_t)(uint8_t)frame[i])&0xFFU)];
if (i==tmp) break;
} /* end for */
return frame[to-1L]==(char)crc && frame[to-2L]==(char)X2C_LSH(crc,
16,-8);
} /* end crcrs() */
static int32_t getint32(const byte frame[], uint32_t frame_len,
uint32_t p)
{
uint32_t n;
uint32_t i;
n = 0UL;
for (i = 3UL;; i--) {
n = n*256UL+(uint32_t)(uint8_t)frame[p+i];
if (i==0UL) break;
} /* end for */
return (int32_t)n;
} /* end getint32() */
static uint32_t getcard16(const byte frame[], uint32_t frame_len,
uint32_t p)
{
return (uint32_t)(uint8_t)frame[p]+256UL*(uint32_t)(uint8_t)
frame[p+1UL];
} /* end getcard16() */
static int32_t getint16(const byte frame[], uint32_t frame_len,
uint32_t p)
{
uint32_t n;
n = (uint32_t)(uint8_t)frame[p]+256UL*(uint32_t)(uint8_t)
frame[p+1UL];
if (n>=32768UL) return (int32_t)(n-65536UL);
return (int32_t)n;
} /* end getint16() */
static void wgs84r(double x, double y, double z,
double * lat, double * long0,
double * heig)
{
double sl;
double ct;
double st;
double t;
double rh;
double xh;
double h;
h = x*x+y*y;
if (h>0.0) {
rh = (double)sqrt((float)h);
xh = x+rh;
*long0 = atang2(xh, y)*2.0;
if (*long0>3.1415926535898) *long0 = *long0-6.2831853071796;
t = (double)atan((float)(X2C_DIVL(z*1.003364089821,
rh)));
st = (double)sin((float)t);
ct = (double)cos((float)t);
*lat = (double)atan((float)
(X2C_DIVL(z+4.2841311513312E+4*st*st*st,
rh-4.269767270718E+4*ct*ct*ct)));
sl = (double)sin((float)*lat);
*heig = X2C_DIVL(rh,(double)cos((float)*lat))-(double)(X2C_DIVR(6.378137E+6f,
sqrt((float)(1.0-6.6943799901413E-3*sl*sl))));
}
else {
*lat = 0.0;
*long0 = 0.0;
*heig = 0.0;
}
/* lat:=atan(z/(rh*(1.0 - E2))); */
/* heig:=sqrt(h + z*z) - EARTHA; */
} /* end wgs84r() */
// returns: 0=ok, -1=error
static void posrs41(const byte b[], uint32_t b_len, uint32_t p)
{
double dir;
double vu;
double ve;
double vn;
double vz;
double vy;
double vx;
double heig;
double long0;
double lat;
double z;
double y;
double x;
x = (double)getint32(b, b_len, p)*0.01;
y = (double)getint32(b, b_len, p+4UL)*0.01;
z = (double)getint32(b, b_len, p+8UL)*0.01;
wgs84r(x, y, z, &lat, &long0, &heig);
Serial.print(" ");
sonde.si()->lat = (float)(X2C_DIVL(lat,1.7453292519943E-2));
Serial.print(sonde.si()->lat);
Serial.print(" ");
sonde.si()->lon = (float)(X2C_DIVL(long0,1.7453292519943E-2));
Serial.print(sonde.si()->lon);
if (heig<1.E+5 && heig>(-1.E+5)) {
Serial.print(" ");
Serial.print((uint32_t)heig);
Serial.print("m");
}
/*speed */
vx = (double)getint16(b, b_len, p+12UL)*0.01;
vy = (double)getint16(b, b_len, p+14UL)*0.01;
vz = (double)getint16(b, b_len, p+16UL)*0.01;
vn = (-(vx*(double)sin((float)lat)*(double)
cos((float)long0))-vy*(double)
sin((float)lat)*(double)sin((float)
long0))+vz*(double)cos((float)lat);
ve = -(vx*(double)sin((float)long0))+vy*(double)
cos((float)long0);
vu = vx*(double)cos((float)lat)*(double)
cos((float)long0)+vy*(double)
cos((float)lat)*(double)sin((float)
long0)+vz*(double)sin((float)lat);
dir = X2C_DIVL(atang2(vn, ve),1.7453292519943E-2);
if (dir<0.0) dir = 360.0+dir;
sonde.si()->dir = dir;
Serial.print(" ");
sonde.si()->hs = sqrt((float)(vn*vn+ve*ve))*3.6f;
Serial.print(sonde.si()->hs);
Serial.print("km/h ");
Serial.print(dir);
Serial.print("deg ");
Serial.print((float)vu);
sonde.si()->vs = vu;
Serial.print("m/s ");
uint8_t sats = getcard16(b, b_len, p+18UL)&255UL;
Serial.print(sats);
Serial.print("Sats");
sonde.si()->sats = sats;
sonde.si()->alt = heig;
if( 0==(int)(lat*10000) && 0==(int)(long0*10000) ) {
if(sonde.si()->validPos) {
// we have an old position, so keep previous position and mark it as old
sonde.si()->validPos |= 0x80;
}
}
else
sonde.si()->validPos = 0x7f;
} /* end posrs41() */
// returns: 0: ok, -1: rs or crc error
int RS41::decode41(byte *data, int maxlen)
{
char buf[128];
int crcok = 0;
int32_t corr = reedsolomon41(data, 560, 131); // try short frame first
if(corr<0) {
corr = reedsolomon41(data, 560, 230); // try long frame
}
#if 0
Serial.print("RS result:");
Serial.print(corr);
Serial.println();
#endif
int p = 57; // 8 byte header, 48 byte RS
while(p<maxlen) { /* why 555? */
uint8_t typ = data[p++];
uint32_t len = data[p++]+2UL;
if(p+len>maxlen) break;
#if 0
// DEBUG OUTPUT
Serial.print("@");
Serial.print(p-2);
Serial.print(": ID:");
Serial.print(typ, HEX);
Serial.print(", len=");
Serial.print(len);
Serial.print(": ");
for(int i=0; i<len-1; i++) {
char buf[3];
snprintf(buf, 4, "%02X|", data[p+i]);
Serial.print(buf);
}
#endif
// check CRC
if(!crcrs(data, 560, p, p+len)) {
Serial.println("###CRC ERROR###");
} else {
crcok = 1;
switch(typ) {
case 'y': // name
{
Serial.print("#");
uint16_t fnr = data[p]+(data[p+1]<<8);
Serial.print(fnr);
sonde.si()->frame = fnr;
Serial.print("; RS41 ID ");
snprintf(buf, 10, "%.8s ", data+p+2);
Serial.print(buf);
sonde.si()->type=STYPE_RS41;
strncpy(sonde.si()->id, (const char *)(data+p+2), 8);
sonde.si()->id[8]=0;
strncpy(sonde.si()->ser, (const char *)(data+p+2), 8);
sonde.si()->ser[8]=0;
sonde.si()->validID=true;
int calnr = data[p+23];
// not sure about this
if(calnr==0x31) {
uint16_t bt = data[p+30] + 256*data[p+31];
sonde.si()->burstKT = bt;
}
// this should be right...
if(calnr==0x02) {
uint16_t kt = data[p+31] + 256*data[p+32];
sonde.si()->launchKT = kt;
}
// and this seems fine as well...
if(calnr==0x32) {
uint16_t cntdown = data[p+24] + (data[p+25]<<8);
uint16_t min = cntdown - (cntdown/3600)*3600;
Serial.printf("Countdown value: %d\n [%2d:%02d:%02d]", cntdown, cntdown/3600, min/60, min-(min/60)*60);
sonde.si()->countKT = cntdown;
sonde.si()->crefKT = fnr;
}
}
// TODO: some more data
break;
case '|': // date
{
uint32_t gpstime = getint32(data, 560, p+2);
uint16_t gpsweek = getint16(data, 560, p);
// UTC is GPSTIME - 18s (24*60*60-18 = 86382)
// one week = 7*24*60*60 = 604800 seconds
// unix epoch starts jan 1st 1970 0:00
// gps time starts jan 6, 1980 0:00. thats 315964800 epoch seconds.
// subtracting 86400 yields 315878400UL
sonde.si()->time = (gpstime/1000) + 86382 + gpsweek*604800 + 315878400UL;
sonde.si()->validTime = true;
}
break;
case '{': // pos
posrs41(data+p, len, 0);
break;
default:
break;
}}
p += len;
Serial.println();
}
return crcok ? 0 : -1;
}
void RS41::printRaw(uint8_t *data, int len)
{
char buf[3];
int i;
for(i=0; i<len; i++) {
snprintf(buf, 3, "%02X", data[i]);
Serial.print(buf);
}
Serial.println();
}
void RS41::bitsToBytes(uint8_t *bits, uint8_t *bytes, int len)
{
int i;
for(i=0; i<len*4; i++) {
bytes[i/8] = (bytes[i/8]<<1) | (bits[i]?1:0);
}
bytes[(i-1)/8] &= 0x0F;
}
static unsigned char lookup[16] = {
0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf, };
static uint8_t reverse(uint8_t n) {
return (lookup[n&0x0f] << 4) | lookup[n>>4];
}
static uint8_t scramble[64] = {150U,131U,62U,81U,177U,73U,8U,152U,50U,5U,89U,
14U,249U,68U,198U,38U,33U,96U,194U,234U,121U,93U,109U,161U,
84U,105U,71U,12U,220U,232U,92U,241U,247U,118U,130U,127U,7U,
153U,162U,44U,147U,124U,48U,99U,245U,16U,46U,97U,208U,188U,
180U,182U,6U,170U,244U,35U,120U,110U,59U,174U,191U,123U,76U,
193U};
int RS41::receive() {
sx1278.setPayloadLength(RS41MAXLEN-8);
int e = sx1278.receivePacketTimeout(1000, data+8);
if(e) { Serial.println("TIMEOUT"); return RX_TIMEOUT; }
for(int i=0; i<RS41MAXLEN; i++) { data[i] = reverse(data[i]); }
for(int i=0; i<RS41MAXLEN; i++) { data[i] = data[i] ^ scramble[i&0x3F]; }
return decode41(data, RS41MAXLEN);
}
int RS41::waitRXcomplete() {
// Currently not used. can be used for additinoal post-processing
// (required for RS92 to avoid FIFO overrun in rx task)
#if 0
int res;
uint32_t t0 = millis();
while(rxtask.receiveResult<0 && millis()-t0 < 3000) { delay(50); }
if(rxtask.receiveResult<0 || rxtask.receiveResult==RX_TIMEOUT) {
res = RX_TIMEOUT;
} else if (rxtask.receiveResult==0) {
res = RX_OK;
} else {
res = RX_ERROR;
}
rxtask.receiveResult = -1;
Serial.printf("waitRXcomplete returning %d\n", res);
return res;
#endif
return 0;
}
RS41 rs41 = RS41();
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