/* * Driver for Navcom receivers using proprietary NCT messages, a binary protocol. * * Vendor website: http://www.navcomtech.com/ * Technical references: Technical Reference Manual P/N 96-3120001-3001 * * Tested with two SF-2040G models * * At this stage, this driver implements the following commands: * * 0x20: Data Request (tell the unit which responses you want) * 0x3f: LED Configuration (controls the front panel LEDs -- for testing) * 0x1c: Test Support Block (again, blinks the front panel lights) * * and it understands the following responses: * * 0x06: Acknowledgement (without error) * 0x15: Negative Acknowledge * 0x86: Channel Status * 0xae: Identification Block * 0xb0: Raw Meas. Data Block * 0xb1: PVT Block * 0xb5: Pseudorange Noise Statistics * 0xd3: LBM DSP Status Block * 0xef: Clock Drift and Offset * * By Diego Berge. Contact via web form at http://www.navlost.eu/contact * * Week counters are not limited to 10 bits. It's unknown what * the firmware is doing to disambiguate them, if anything; it might just * be adding a fixed offset based on a hidden epoch value, in which case * unhappy things will occur on the next rollover. * * This file is Copyright (c) 2010-2018 by the GPSD project * SPDX-License-Identifier: BSD-2-clause */ #include #include #include #include #include "gpsd.h" #if defined(NAVCOM_ENABLE) #include "bits.h" /* Have data which is 24 bits long */ #define getles3224(buf,off) (int32_t)(((uint32_t)getub((buf), (off)+2)<<24 | (uint32_t)getub((buf), (off)+1)<<16 | (uint32_t)getub((buf), (off))<<8)>>8) #define getleu3224(buf,off) (uint32_t)(((uint32_t)getub((buf), (off)+2)<<24 | (uint32_t)getub((buf), (off)+1)<<16 | (uint32_t)getub((buf), (off))<<8)>>8) /* And just to be difficult, Navcom is little endian but the GPS data stream is big endian. Some messages contain raw GPS data */ #define getles16_be(buf, off) (int16_t)((((uint16_t)getub(buf, (off)) << 8) \ | (uint16_t)getub(buf, (off)+1))) #define getleu16_be(buf, off) (uint16_t)((((uint16_t)getub(buf, (off)) << 8) \ | (uint16_t)getub(buf, (off)+1))) #define getles32_be(buf, off) (int32_t)((((uint16_t)getleu16_be(buf, (off)) << 16) \ | getleu16_be(buf, (off)+2))) #define getleu32_be(buf, off) (uint32_t)((((uint16_t)getleu16_be(buf, (off)) << 16) \ | getleu16_be(buf, (off)+2))) #define getles64_be(buf, off) (int64_t)((((uint64_t)getleu32_be(buf, (off)) << 32) \ | getleu32_be(buf, (off)+4))) #define getleu64_be(buf, off) (uint64_t)((((uint64_t)getleu32_be(buf, (off)) << 32) \ | getleu32_be(buf, (off)+4))) #define getles3224_be(buf,off) (int32_t)(((uint32_t)getub((buf), (off))<<24 \ | (uint32_t)getub((buf), (off)+1)<<16 \ | (uint32_t)getub((buf), (off)+2)<<8)>>8) #define NAVCOM_CHANNELS 12 static uint8_t checksum(unsigned char *buf, size_t len) { size_t n; uint8_t csum = (uint8_t) 0x00; for (n = 0; n < len; n++) csum ^= buf[n]; return csum; } static bool navcom_send_cmd(struct gps_device_t *session, unsigned char *cmd, size_t len) { return (gpsd_write(session, (const char *)cmd, len) == (ssize_t) len); } /* Data Request */ static void navcom_cmd_0x20(struct gps_device_t *session, uint8_t block_id, uint16_t rate) { unsigned char msg[18]; putbyte(msg, 0, 0x02); putbyte(msg, 1, 0x99); putbyte(msg, 2, 0x66); putbyte(msg, 3, 0x20); /* Cmd ID */ putle16(msg, 4, 0x000e); /* Length */ putbyte(msg, 6, 0x00); /* Action */ putbyte(msg, 7, 0x01); /* Count of blocks */ putbyte(msg, 8, block_id); /* Data Block ID */ putbyte(msg, 9, 0x02); /* Logical Ports */ putle16(msg, 10, rate); /* Data rate */ putbyte(msg, 12, 0x71); putbyte(msg, 13, 0x00); putle16(msg, 14, 0x0000); putbyte(msg, 16, checksum(msg + 3, 13)); putbyte(msg, 17, 0x03); (void)navcom_send_cmd(session, msg, 18); gpsd_log(&session->context->errout, LOG_PROG, "Navcom: sent command 0x20 (Data Request) " "- data block id = %02x at rate %02x\n", block_id, rate); } // cppcheck-suppress unusedFunction static void UNUSED navcom_cmd_0x3f(struct gps_device_t *session) /* Changes the LED settings in the receiver */ { unsigned char msg[12]; putbyte(msg, 0, 0x02); putbyte(msg, 1, 0x99); putbyte(msg, 2, 0x66); putbyte(msg, 3, 0x3f); /* Cmd ID */ putle16(msg, 4, 0x0008); putbyte(msg, 6, 0x01); /* Action */ putbyte(msg, 7, 0x00); /* Reserved */ putbyte(msg, 8, 0x02); /* Link LED setting */ putbyte(msg, 9, 0x0a); /* Battery LED setting */ putbyte(msg, 10, checksum(msg + 3, 7)); putbyte(msg, 11, 0x03); (void)navcom_send_cmd(session, msg, 12); gpsd_log(&session->context->errout, LOG_PROG, "Navcom: sent command 0x3f (LED Configuration Block)\n"); } /* Test Support Block - Blinks the LEDs */ static void navcom_cmd_0x1c(struct gps_device_t *session, uint8_t mode, uint8_t length) { unsigned char msg[12]; putbyte(msg, 0, 0x02); putbyte(msg, 1, 0x99); putbyte(msg, 2, 0x66); putbyte(msg, 3, 0x1c); /* Cmd ID */ putle16(msg, 4, 0x0008); putbyte(msg, 6, 0x04); /* Use ACK/NAK */ putbyte(msg, 7, mode); /* 0x01 or 0x02 */ putbyte(msg, 8, length); /* Only if mode == 0x01 */ putbyte(msg, 9, 0x00); putbyte(msg, 10, checksum(msg + 3, 7)); putbyte(msg, 11, 0x03); (void)navcom_send_cmd(session, msg, 12); gpsd_log(&session->context->errout, LOG_PROG, "Navcom: sent command 0x1c (Test Support Block)\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: command 0x1c mode = %02x, length = %u\n", mode, length); } #ifdef RECONFIGURE_ENABLE /* Serial Port Configuration */ static void navcom_cmd_0x11(struct gps_device_t *session, uint8_t port_selection) { /* NOTE - We only allow changing one port at a time, * although the message supports doing both at once. */ unsigned char msg[12]; putbyte(msg, 0, 0x02); putbyte(msg, 1, 0x99); putbyte(msg, 2, 0x66); putbyte(msg, 3, 0x11); /* Cmd ID */ putle16(msg, 4, 0x0008); /* Length */ putbyte(msg, 6, 0x04); /* Action - Use ACK/NAK) */ putbyte(msg, 7, port_selection); putbyte(msg, 8, 0x00); /* Reserved */ putbyte(msg, 9, 0x00); /* Reserved */ putbyte(msg, 10, checksum(msg + 3, 7)); putbyte(msg, 11, 0x03); (void)navcom_send_cmd(session, msg, 12); gpsd_log(&session->context->errout, LOG_PROG, "Navcom: sent command 0x11 (Serial Port Configuration)\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: serial port selection: 0x%02x\n", port_selection); } #endif /* RECONFIGURE_ENABLE */ static void navcom_event_hook(struct gps_device_t *session, event_t event) { if (session->context->readonly) return; /* Request the following messages: */ if (event == event_identified) { /* NOTE - Channel Status allows us to know into which of the * unit's various serial ports we are connected. * Its value gets updated every time we receive a 0x06 (Ack) * message. Note that if commands are being fed into the * unit from more than one port (which is entirely possible * although not necessarily a bright idea), there is a good * chance that we might misidentify our port */ navcom_cmd_0x1c(session, 0x02, 0); /* Test Support Block */ navcom_cmd_0x20(session, 0xae, 0x0000); /* Identification Block */ navcom_cmd_0x20(session, 0x86, 0x000a); /* Channel Status */ navcom_cmd_0x1c(session, 0x01, 5); /* Blink LEDs on receiver */ navcom_cmd_0x20(session, 0xae, 0x1770); /* Identification Block - send every 10 min */ navcom_cmd_0x20(session, 0xb1, 0x4000); /* PVT Block */ navcom_cmd_0x20(session, 0xb5, 0x00c8); /* Pseudorange Noise Statistics - send every 20s */ navcom_cmd_0x20(session, 0xb0, 0x4000); /* Raw Meas Data Block */ navcom_cmd_0x20(session, 0x81, 0x0000); /* Packed Ephemeris Data - send once */ navcom_cmd_0x20(session, 0x81, 0x4000); /* Packed Ephemeris Data */ navcom_cmd_0x20(session, 0x86, 0x4000); /* Channel Status */ navcom_cmd_0x20(session, 0x83, 0x4000); /* Ionosphere and UTC Data */ navcom_cmd_0x20(session, 0xef, 0x0bb8); /* Clock Drift - send every 5 min */ } } /* Ionosphere and UTC Data */ static gps_mask_t handle_0x83(struct gps_device_t *session) { /* NOTE - At the present moment this is only being used * for determining the GPS-UTC time difference, * for which the iono data is not needed as far * as we are concerned. However, I am still * reporting it (if debuglevel >= LOG_DATA) as a * matter of interest */ /* 2^-30 */ #define SF_A0 (0.000000000931322574615478515625) /* 2^-50 */ #define SF_A1 (0.000000000000000888178419700125) /* 2^12 */ #define SF_TOT (4096) /* 2^-30 */ #define SF_ALPHA0 (0.000000000931322574615478515625) /* 2^-27 */ #define SF_ALPHA1 (0.000000007450580596923828125) /* 2^-24 */ #define SF_ALPHA2 (0.000000059604644775390625) /* 2^-24 */ #define SF_ALPHA3 (0.000000059604644775390625) /* 2^11 */ #define SF_BETA0 (2048) /* 2^14 */ #define SF_BETA1 (16384) /* 2^16 */ #define SF_BETA2 (65536) /* 2^16 */ #define SF_BETA3 (65536) unsigned char *buf = session->lexer.outbuffer + 3; uint16_t week = getleu16(buf, 3); uint32_t tow = getleu32(buf, 5); int8_t alpha0 = getsb(buf, 9); int8_t alpha1 = getsb(buf, 10); int8_t alpha2 = getsb(buf, 11); int8_t alpha3 = getsb(buf, 12); int8_t beta0 = getsb(buf, 13); int8_t beta1 = getsb(buf, 14); int8_t beta2 = getsb(buf, 15); int8_t beta3 = getsb(buf, 16); int32_t a1 = getles32(buf, 17); int32_t a0 = getles32(buf, 21); uint8_t tot = getub(buf, 25); uint8_t wnt = getub(buf, 26); int8_t dtls = getsb(buf, 27); uint8_t wnlsf = getub(buf, 28); uint8_t dn = getub(buf, 29); int8_t dtlsf = getsb(buf, 30); /* Ref.: ICD-GPS-200C 20.3.3.5.2.4 */ if ((week % 256) * 604800 + tow / 1000.0 < wnlsf * 604800 + dn * 86400) { /* Effectivity time is in the future, use dtls */ session->context->leap_seconds = (int)dtls; } else { /* Effectivity time is not in the future, use dtlsf */ session->context->leap_seconds = (int)dtlsf; } gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0x83 (Ionosphere and UTC Data)\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: Scaled parameters follow:\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: GPS Week: %u, GPS Time of Week: %u (GPS Time: %f)\n", week, tow, week * 604800 + tow / 1000.0); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: a0: %12.4E, a1: %12.4E, a2: %12.4E, a3: %12.4E, " "b0: %12.4E, b1: %12.4E, b2: %12.4E, b3: %12.4E\n", (double)alpha0 * SF_ALPHA0, (double)alpha1 * SF_ALPHA1, (double)alpha2 * SF_ALPHA2, (double)alpha3 * SF_ALPHA3, (double)beta0 * SF_BETA0, (double)beta1 * SF_BETA1, (double)beta2 * SF_BETA2, (double)beta3 * SF_BETA3); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: A0: %19.12E, A1: %19.12E\n", (double)a0 * SF_A0, (double)a1 * SF_A1); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: UTC Ref. Time: %lu, UTC Ref. Week: %u, dTls: %d\n", (unsigned long)tot * SF_TOT, wnt, dtls); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: Week of leap seconds: %u, Day number of leap seconds: %u, dTlsf: %d\n", wnlsf, dn, dtlsf); return 0; /* No flag for update of leap seconds (Not part of a fix) */ #undef SF_A0 #undef SF_A1 #undef SF_TOT #undef SF_ALPHA0 #undef SF_ALPHA1 #undef SF_ALPHA2 #undef SF_ALPHA3 #undef SF_BETA0 #undef SF_BETA1 #undef SF_BETA2 #undef SF_BETA3 } /* Acknowledgement (without error) */ static gps_mask_t handle_0x06(struct gps_device_t *session) { unsigned char *buf = session->lexer.outbuffer + 3; uint8_t cmd_id = getub(buf, 3); uint8_t port = getub(buf, 4); session->driver.navcom.physical_port = port; /* This tells us which serial port was used last */ gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0x06 (Acknowledgement (without error))\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: acknowledged command id 0x%02x on port %c\n", cmd_id, (port == 0 ? 'A' : (port == 1 ? 'B' : '?'))); return 0; /* Nothing updated */ } /* Negative Acknowledge */ static gps_mask_t handle_0x15(struct gps_device_t *session) { size_t n; unsigned char *buf = session->lexer.outbuffer + 3; size_t msg_len = (size_t) getleu16(buf, 1); uint8_t port, cmd_id = getub(buf, 3); gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0x15 (Negative Acknowledge)\n"); /* coverity_submit[tainted_data] */ for (n = 4; n < (msg_len - 2); n += 2) { uint8_t err_id = getub(buf, n); uint8_t err_desc = getub(buf, n + 1); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: error id = 0x%02x, error description = 0x%02x\n", err_id, err_desc); } port = getub(buf, n); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: negative acknowledge was for command id 0x%02x on port %c\n", cmd_id, (port == 0 ? 'A' : (port == 1 ? 'B' : '?'))); return 0; /* Nothing updated */ } /* PVT Block */ static gps_mask_t handle_0xb1(struct gps_device_t *session) { gps_mask_t mask; unsigned char *buf = session->lexer.outbuffer + 3; uint16_t week; uint32_t tow; int32_t lat, lon; /* Resolution of lat/lon values (2^-11) */ #define LL_RES (0.00048828125) uint8_t lat_fraction, lon_fraction; /* Resolution of lat/lon fractions (2^-15) */ #define LL_FRAC_RES (0.000030517578125) uint8_t nav_mode; int32_t ellips_height, altitude; /* Resolution of height and altitude values (2.0^-10) */ #define EL_RES (0.0009765625) double vel_north, vel_east, vel_up; /* Resolution of velocity values (2.0^-10) */ #define VEL_RES (0.0009765625) double track; uint8_t fom, gdop, pdop, hdop, vdop, tdop, tfom; double eph; /* This value means "undefined" */ #define DOP_UNDEFINED (255) int16_t ant_height_adj; int32_t set_delta_up; /* Resolution of delta north, east, and up, * and ant. height adjustment values (1mm) */ #define D_RES (0.001) #ifdef __UNUSED__ /* Other values provided by the PVT block which we * may want to provide in the future. At the present * moment, the gpsd protocol does not have a mechanism * to make this available to the user */ uint8_t dgps_conf; uint16_t max_dgps_age; uint8_t ext_nav_mode; int32_t set_delta_north, set_delta_east; uint8_t nav_failure_code; #endif /* __UNUSED__ */ /* Timestamp */ week = (uint16_t) getleu16(buf, 3); tow = (uint32_t) getleu32(buf, 5); session->newdata.time = gpsd_gpstime_resolve(session, week, tow / 1000.0); /* Get latitude, longitude */ lat = getles32(buf, 13); lon = getles32(buf, 17); lat_fraction = (uint8_t) (getub(buf, 21) >> 4); lon_fraction = (uint8_t) (getub(buf, 21) & 0x0f); session->newdata.latitude = (double)(lat * LL_RES + lat_fraction * LL_FRAC_RES) / 3600; session->newdata.longitude = (double)(lon * LL_RES + lon_fraction * LL_FRAC_RES) / 3600; /* Nav mode */ nav_mode = (uint8_t) getub(buf, 22); if (-nav_mode & 0x80) { session->gpsdata.status = STATUS_NO_FIX; session->newdata.mode = MODE_NO_FIX; } else { session->newdata.mode = ((nav_mode & 0x40)!=0 ? MODE_3D : MODE_2D); session->gpsdata.status = ((nav_mode & 0x03)!=0 ? STATUS_DGPS_FIX : STATUS_FIX); } /* Height Data */ ellips_height = getles32(buf, 23); altitude = getles32(buf, 27); ant_height_adj = getles16(buf, 51); set_delta_up = getles32(buf, 79); session->newdata.altitude = (double)(altitude * EL_RES) + (ant_height_adj * D_RES) + (set_delta_up * D_RES); session->gpsdata.separation = (double)(ellips_height - altitude) * EL_RES + (ant_height_adj * D_RES) + (set_delta_up * D_RES); /* Speed Data */ vel_north = (double)getles3224(buf, 31); vel_east = (double)getles3224(buf, 34); /* vel_up = getles3224(buf, 37); */ vel_up = (double)getles3224(buf, 37); track = atan2(vel_east, vel_north); if (track < 0) track += 2 * GPS_PI; session->newdata.track = track * RAD_2_DEG; session->newdata.speed = sqrt(pow(vel_east, 2) + pow(vel_north, 2)) * VEL_RES; session->newdata.climb = vel_up * VEL_RES; /* Quality indicators */ fom = getub(buf, 40); gdop = getub(buf, 41); pdop = getub(buf, 42); hdop = getub(buf, 43); vdop = getub(buf, 44); tdop = getub(buf, 45); tfom = getub(buf, 46); /* tfom == 10 * TDOP */ /* Get two-sigma horizontal circular error estimate */ eph = fom / 100.0 * 1.96; /* approximate epx and epy errors from it */ session->newdata.epx = session->newdata.epy = eph / sqrt(2); /* this next does not seem a correct way to get to seconds */ session->newdata.ept = tfom * 1.96; /* Two sigma */ if (gdop != DOP_UNDEFINED) session->gpsdata.dop.gdop = gdop / 10.0; if (pdop != DOP_UNDEFINED) session->gpsdata.dop.pdop = pdop / 10.0; if (hdop != DOP_UNDEFINED) session->gpsdata.dop.hdop = hdop / 10.0; if (vdop != DOP_UNDEFINED) session->gpsdata.dop.vdop = vdop / 10.0; if (tdop != DOP_UNDEFINED) session->gpsdata.dop.tdop = tdop / 10.0; gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0xb1 (PVT Report)\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: navigation mode %s (0x%02x) - %s - %s\n", ((-nav_mode & 0x80)!='\0' ? "invalid" : "valid"), nav_mode, ((nav_mode & 0x40)!='\0' ? "3D" : "2D"), ((nav_mode & 0x03)!='\0' ? "DGPS" : "GPS")); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: latitude = %f, longitude = %f, altitude = %f, geoid = %f\n", session->newdata.latitude, session->newdata.longitude, session->newdata.altitude, session->gpsdata.separation); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: velocities: north = %f, east = %f, up = %f (track = %f, speed = %f)\n", vel_north * VEL_RES, vel_east * VEL_RES, vel_up * VEL_RES, session->newdata.track, session->newdata.speed); #undef D_RES #undef LL_RES #undef LL_FRAC_RES #undef EL_RES #undef VEL_RES #undef DOP_UNDEFINED mask = LATLON_SET | ALTITUDE_SET | CLIMB_SET | SPEED_SET | TRACK_SET | STATUS_SET | MODE_SET | USED_IS | HERR_SET | VERR_SET | TIMERR_SET | DOP_SET | TIME_SET | NTPTIME_IS; gpsd_log(&session->context->errout, LOG_DATA, "PVT 0xb1: time=%.2f, lat=%.2f lon=%.2f alt=%.f " "speed=%.2f track=%.2f climb=%.2f mode=%d status=%d " "epx=%.2f epy=%.2f epv=%.2f " "gdop=%.2f pdop=%.2f hdop=%.2f vdop=%.2f tdop=%.2f " "mask={LATLON|ALTITUDE|CLIMB|SPEED|TRACK|TIME|STATUS|MODE|" "USED|HERR|VERR|TIMERR|DOP}\n", session->newdata.time, session->newdata.latitude, session->newdata.longitude, session->newdata.altitude, session->newdata.speed, session->newdata.track, session->newdata.climb, session->newdata.mode, session->gpsdata.status, session->newdata.epx, session->newdata.epy, session->newdata.epv, session->gpsdata.dop.gdop, session->gpsdata.dop.pdop, session->gpsdata.dop.hdop, session->gpsdata.dop.vdop, session->gpsdata.dop.tdop); return mask; } /* Packed Ephemeris Data */ static gps_mask_t handle_0x81(struct gps_device_t *session) { /* Scale factors for everything */ /* 2^-31 */ #define SF_TGD (.000000000465661287307739257812) /* 2^4 */ #define SF_TOC (16) /* 2^-55 */ #define SF_AF2 (.000000000000000027755575615628) /* 2^-43 */ #define SF_AF1 (.000000000000113686837721616029) /* 2^-31 */ #define SF_AF0 (.000000000465661287307739257812) /* 2^-5 */ #define SF_CRS (.031250000000000000000000000000) /* 2^-43 */ #define SF_DELTA_N (.000000000000113686837721616029) /* 2^-31 */ #define SF_M0 (.000000000465661287307739257812) /* 2^-29 */ #define SF_CUC (.000000001862645149230957031250) /* 2^-33 */ #define SF_E (.000000000116415321826934814453) /* 2^-29 */ #define SF_CUS (.000000001862645149230957031250) /* 2^-19 */ #define SF_SQRT_A (.000001907348632812500000000000) /* 2^4 */ #define SF_TOE (16) /* 2^-29 */ #define SF_CIC (.000000001862645149230957031250) /* 2^-31 */ #define SF_OMEGA0 (.000000000465661287307739257812) /* 2^-29 */ #define SF_CIS (.000000001862645149230957031250) /* 2^-31 */ #define SF_I0 (.000000000465661287307739257812) /* 2^-5 */ #define SF_CRC (.031250000000000000000000000000) /* 2^-31 */ #define SF_OMEGA (.000000000465661287307739257812) /* 2^-43 */ #define SF_OMEGADOT (.000000000000113686837721616029) /* 2^-43 */ #define SF_IDOT (.000000000000113686837721616029) unsigned char *buf = session->lexer.outbuffer + 3; uint8_t prn = getub(buf, 3); uint16_t week = getleu16(buf, 4); uint32_t tow = getleu32(buf, 6); uint16_t iodc = getleu16(buf, 10); /* And now the fun starts... everything that follows is * raw GPS data minus parity */ /* Subframe 1, words 3 to 10 minus parity */ uint16_t wn = (getleu16_be(buf, 12) & 0xffc0) >> 6; uint8_t cl2 = (getub(buf, 13) & 0x30) >> 4; uint8_t ura = getub(buf, 13) & 0x0f; uint8_t svh = (getub(buf, 14) & 0xfc) >> 2; /* We already have IODC from earlier in the message, so * we do not decode again */ /* uint16_t iodc = (getub(buf, 14)&0x03)<<8;*/ uint8_t l2pd = (getub(buf, 15) & 0x80) >> 7; int8_t tgd = getsb(buf, 26); /* iodc |= getub(buf, 27);*/ uint16_t toc = getleu16_be(buf, 28); int8_t af2 = getsb(buf, 30); int16_t af1 = getles16_be(buf, 31); int32_t af0 = getles3224_be(buf, 33) >> 2; /* Subframe 2, words 3 to 10 minus parity */ uint8_t iode = getub(buf, 36); int16_t crs = getles16_be(buf, 37); int16_t delta_n = getles16_be(buf, 39); int32_t m0 = getles32_be(buf, 41); int16_t cuc = getles16_be(buf, 45); uint32_t e = getleu32_be(buf, 47); int16_t cus = getles16_be(buf, 51); uint32_t sqrt_a = getleu32_be(buf, 53); uint16_t toe = getleu16_be(buf, 57); /* NOTE - Fit interval & AODO not collected */ /* Subframe 3, words 3 to 10 minus parity */ int16_t cic = getles16_be(buf, 60); int32_t Omega0 = getles32_be(buf, 62); int16_t cis = getles16_be(buf, 66); int32_t i0 = getles32_be(buf, 68); int16_t crc = getles16_be(buf, 72); int32_t omega = getles32_be(buf, 74); int32_t Omegadot = getles3224_be(buf, 78); /* Question: What is the proper way of shifting a signed int 2 bits to * the right, preserving sign? Answer: integer division by 4. */ int16_t idot = (int16_t) (((getles16_be(buf, 82) & 0xfffc) / 4) | ((getub(buf, 82) & 80) ? 0xc000 : 0x0000)); session->context->gps_week = (unsigned short)wn; session->context->gps_tow = (double)(toc * SF_TOC); /* leap second? */ gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0x81 (Packed Ephemeris Data)\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: PRN: %u, Week: %u, TOW: %.3f SV clock bias/drift/drift rate: %#19.12E/%#19.12E/%#19.12E\n", prn, session->context->gps_week, session->context->gps_tow, ((double)af0) * SF_AF0, ((double)af1) * SF_AF1, ((double)af2) * SF_AF2); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: IODE (!AODE): %u Crs: %19.12e, Delta n: %19.12e, M0: %19.12e\n", iode, (double)crs * SF_CRS, (double)delta_n * SF_DELTA_N * GPS_PI, (double)m0 * SF_M0 * GPS_PI); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: Cuc: %19.12e, Eccentricity: %19.12e, Cus: %19.12e, A^1/2: %19.12e\n", (double)cuc * SF_CUC, (double)e * SF_E, (double)cus * SF_CUS, (double)sqrt_a * SF_SQRT_A); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: TOE: %u, Cic: %19.12e, Omega %19.12e, Cis: %19.12e\n", toe * SF_TOE, (double)cic * SF_CIC, (double)Omega0 * SF_OMEGA0 * GPS_PI, (double)cis * SF_CIS); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: i0: %19.12e, Crc: %19.12e, omega: %19.12e, Omega dot: %19.12e\n", (double)i0 * SF_I0 * GPS_PI, (double)crc * SF_CRC, (double)omega * SF_OMEGA * GPS_PI, (double)Omegadot * SF_OMEGADOT * GPS_PI); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: IDOT: %19.12e, Codes on L2: 0x%x, GPS Week: %u, L2 P data flag: %x\n", (double)idot * SF_IDOT * GPS_PI, cl2, week - (week % 1024) + wn, l2pd); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: SV accuracy: 0x%x, SV health: 0x%x, TGD: %f, IODC (!AODC): %u\n", ura, svh, (double)tgd * SF_TGD, iodc); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: Transmission time: %u\n", tow); #undef SF_TGD #undef SF_TOC #undef SF_AF2 #undef SF_AF1 #undef SF_AF0 #undef SF_CRS #undef SF_DELTA_N #undef SF_M0 #undef SF_CUC #undef SF_E #undef SF_CUS #undef SF_SQRT_A #undef SF_TOE #undef SF_CIC #undef SF_OMEGA0 #undef SF_CIS #undef SF_I0 #undef SF_CRC #undef SF_OMEGA #undef SF_OMEGADOT #undef SF_IDOT return 0; } /* Channel Status */ static gps_mask_t handle_0x86(struct gps_device_t *session) { size_t n, i, nsu; unsigned char *buf = session->lexer.outbuffer + 3; size_t msg_len = (size_t) getleu16(buf, 1); uint16_t week = getleu16(buf, 3); uint32_t tow = getleu32(buf, 5); uint8_t eng_status = getub(buf, 9); uint16_t sol_status = getleu16(buf, 10); uint8_t sats_visible = getub(buf, 12); //uint8_t sats_tracked = getub(buf, 13); //uint8_t used_sats = getub(buf, 14); //uint8_t pdop = getub(buf, 15); /* Timestamp */ session->gpsdata.skyview_time = gpsd_gpstime_resolve(session, (unsigned short)week, (double)tow / 1000.0f); /* Give this driver a single point of truth about DOPs */ //session->gpsdata.dop.pdop = (int)pdop / 10.0; /* Satellite count */ session->gpsdata.satellites_visible = (int)sats_visible; /* Fix mode */ switch (sol_status & 0x05) { case 0x05: session->gpsdata.status = STATUS_DGPS_FIX; break; case 0x01: session->gpsdata.status = STATUS_FIX; break; default: session->gpsdata.status = STATUS_NO_FIX; } gpsd_log(&session->context->errout, LOG_DATA, "Navcom: engine status = 0x%x, almanac = %s, time = 0x%x, pos = 0x%x\n", eng_status & 0x07, ((eng_status & 0x08) ? "valid" : "invalid"), eng_status & 0x30 >> 4, eng_status & 0xc0 >> 6); /* Satellite details */ i = nsu = 0; /* coverity_submit[tainted_data] */ for (n = 17; n < msg_len; n += 14) { uint8_t prn, ele, ca_snr, p2_snr, log_channel, hw_channel, s, stat; uint16_t azm, dgps_age; if (i >= MAXCHANNELS) { gpsd_log(&session->context->errout, LOG_ERROR, "Navcom: packet type 0x86: too many satellites!\n"); gpsd_zero_satellites(&session->gpsdata); return 0; } prn = getub(buf, n); /* * This field is described in the Technical Reference as follows: * * Channel Tracking Status: * B0-B1: C/A tracking status * B2-B3: P1 tracking status * B4-B5: P2 tracking status * 00 Acquisition or reacquisition * 01 Code loop locked * 02 Costas loop locked * 11 Full tracking with aiding and active * multipath reduction - all data is valid * B6=1: C/A Bit sync * B7=1: C/A Frame sync * * By observation, the satellite is in use if this status is 0xff. * But errors here are not very serious, all they can affect is * the coverance-matrix calculation for error modeling. */ stat = getub(buf, n + 1); log_channel = getub(buf, n + 2); ele = getub(buf, n + 5); azm = getleu16(buf, n + 6); ca_snr = getub(buf, n + 8); p2_snr = getub(buf, n + 10); dgps_age = getleu16(buf, n + 11); hw_channel = getub(buf, n + 13); s = (unsigned char)0; /* NOTE - In theory, I think one would check for hw channel number to * see if one is dealing with a GPS or other satellite, but the * channel numbers reported bear no resemblance to what the spec * says should be. So I check for the fact that if all three * values below are zero, one is not interested in this satellite */ if (!(ele == 0 && azm == 0 && dgps_age == 0)) { session->gpsdata.skyview[i].PRN = (short)prn; session->gpsdata.skyview[i].elevation = (short)ele; session->gpsdata.skyview[i].azimuth = (short)azm; s = session->gpsdata.skyview[i].ss = (p2_snr ? p2_snr : ca_snr) / 4.0; session->gpsdata.skyview[i++].used = (stat == 0xff); if (stat == 0xff) nsu++; } session->gpsdata.satellites_used = (int)nsu; gpsd_log(&session->context->errout, LOG_DATA, "Navcom: prn = %3u, ele = %02u, azm = %03u, snr = %d (%s), " "dgps age = %.1fs, log ch = %d, hw ch = 0x%02x\n", prn, ele, azm, s, (p2_snr ? "P2" : "C/A"), (double)dgps_age * 0.1, log_channel & 0x3f, hw_channel); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: sol. valid = %c, clock = %s, pos. = %s, " "height = %s, err. code = 0x%x\n", ((sol_status & 0x01) ? 'Y' : 'N'), ((sol_status & 0x02) ? "stable" : "unstable"), ((sol_status & 0x04) ? "dgps" : "unaided"), ((sol_status & 0x08) ? "solved" : "constrained"), ((sol_status & 0x01) ? 0x00 : sol_status & 0x0f00 >> 8)); } gpsd_log(&session->context->errout, LOG_DATA, "CS 0x86: visible=%d, used=%d, mask={SATELLITE|STATUS}\n", session->gpsdata.satellites_visible, session->gpsdata.satellites_used); return SATELLITE_SET | STATUS_SET; } /* Raw Meas. Data Block */ static gps_mask_t handle_0xb0(struct gps_device_t *session) { /* L1 wavelength (299792458m/s / 1575420000Hz) */ #define LAMBDA_L1 (.190293672798364880476317426464) size_t n; unsigned char *buf = session->lexer.outbuffer + 3; size_t msg_len = (size_t) getleu16(buf, 1); uint16_t week = getleu16(buf, 3); uint32_t tow = getleu32(buf, 5); uint8_t tm_slew_acc = getub(buf, 9); uint8_t status = getub(buf, 10); session->context->gps_week = (unsigned short)week; session->context->gps_tow = (double)tow / 1000.0; gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0xb0 (Raw Meas. Data Block)\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: week = %u, tow = %.3f, time slew accumulator = %u (1/1023mS), status = 0x%02x " "(%sclock %s - %u blocks follow)\n", session->context->gps_week, session->context->gps_tow, tm_slew_acc, status, ((status & 0x80) ? "channel time set - " : ""), ((status & 0x40) ? "stable" : "not stable"), status & 0x0f); /* coverity_submit[tainted_data] */ for (n = 11; n < msg_len - 1; n += 16) { uint8_t sv_status = getub(buf, n); uint8_t ch_status = getub(buf, n + 1); uint32_t ca_pseudorange = getleu32(buf, n + 2); /* integer division by 16 is a sign-preserving right shift of 4 bits */ int32_t l1_phase = getles3224(buf, n + 6) / 16; uint8_t l1_slips = (uint8_t) (getles3224(buf, n + 6) & 0x0f); int16_t p1_ca_pseudorange = getles16(buf, n + 9); int16_t p2_ca_pseudorange = getles16(buf, n + 11); int32_t l2_phase = getles3224(buf, n + 13) / 16; uint8_t l2_slips = (uint8_t) (getles3224(buf, n + 13) & 0x0f); double c1 = ((sv_status & 0x80) ? (double)ca_pseudorange / 16.0 * LAMBDA_L1 : NAN); double l1 = ((sv_status & 0x80) ? (double)ca_pseudorange / 16.0 + (double)l1_phase / 256.0 : NAN); double l2 = ((sv_status & 0x20) ? ((double)ca_pseudorange / 16.0 + (double)p2_ca_pseudorange / 16.0) * (120.0 / 154.0) + (double)l2_phase / 256.0 : NAN); double p1 = ((sv_status & 0x40) ? c1 + (double)p1_ca_pseudorange / 16.0 * LAMBDA_L1 : NAN); double p2 = ((sv_status & 0x20) ? c1 + (double)p2_ca_pseudorange / 16.0 * LAMBDA_L1 : NAN); gpsd_log(&session->context->errout, LOG_DATA + 1, "Navcom: >> sv status = 0x%02x (PRN %u - C/A & L1 %s - P1 %s - P2 & L2 %s)\n", sv_status, (sv_status & 0x1f), ((sv_status & 0x80) ? "valid" : "invalid"), ((sv_status & 0x40) ? "valid" : "invalid"), ((sv_status & 0x20) ? "valid" : "invalid")); gpsd_log(&session->context->errout, LOG_DATA + 1, "Navcom: >>> ch status = 0x%02x (Logical channel: %u - CA C/No: %u dBHz) " "sL1: %u, sL2: %u\n", ch_status, ch_status & 0x0f, ((ch_status & 0xf0) >> 4) + 35, l1_slips, l2_slips); gpsd_log(&session->context->errout, LOG_DATA + 1, "Navcom: >>> C1: %14.3f, L1: %14.3f, L2: %14.3f, P1: %14.3f, P2: %14.3f\n", c1, l1, l2, p1, p2); } #undef LAMBDA_L1 return 0; /* Raw measurements not yet implemented in gpsd */ } /* Pseudorange Noise Statistics */ static gps_mask_t handle_0xb5(struct gps_device_t *session) { if (sizeof(double) == 8) { gps_mask_t mask = TIME_SET; char *buf = (char *)session->lexer.outbuffer + 3; uint16_t week = getleu16(buf, 3); uint32_t tow = getleu32(buf, 5); double rms = getled64(buf, 9); #ifdef __UNUSED__ /* Reason why it's unused is these figures do not agree * with those obtained from the PVT report (handle_0xb1). * The figures from 0xb1 do agree with the values reported * by Navcom's PC utility */ //double ellips_maj = getled64(buf, 17); //double ellips_min = getled64(buf, 25); //double ellips_azm = getled64(buf, 33); double lat_sd = getled64(buf, 41); double lon_sd = getled64(buf, 49); double alt_sd = getled64(buf, 57); double hrms = sqrt(pow(lat_sd, 2) + pow(lon_sd, 2)); #endif /* __UNUSED__ */ session->gpsdata.epe = rms * 1.96; mask |= PERR_IS; #ifdef __UNUSED__ session->newdata.eph = hrms * 1.96; session->newdata.epv = alt_sd * 1.96; mask |= (HERR_SET | VERR_SET); #endif /* __UNUSED__ */ session->newdata.time = gpsd_gpstime_resolve(session, (unsigned short)week, (double)tow / 1000.0f); gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0xb5 (Pseudorange Noise Statistics)\n"); gpsd_log(&session->context->errout, LOG_DATA, "Navcom: epe = %f\n", session->gpsdata.epe); return mask; } else { /* Ignore this message block */ if (!session->driver.navcom.warned) { gpsd_log(&session->context->errout, LOG_WARN, "Navcom: received packet type 0xb5 (Pseudorange Noise Statistics) ignored " " - sizeof(double) == 64 bits required\n"); session->driver.navcom.warned = true; } return 0; /* Block ignored - wrong sizeof(double) */ } } /* LBM DSP Status Block */ static gps_mask_t handle_0xd3(struct gps_device_t *session UNUSED) { /* This block contains status information about the * unit's L-band (Inmarsat) module. There is nothing * interesting in it for our purposes so we do not deal * with it. This callback is purely to a) stop * "unrecognised packet" messages appearing in the log * and b) explain what it is for the curious */ return 0; /* Nothing updated */ } /* Identification Block */ static gps_mask_t handle_0xae(struct gps_device_t *session) { char *engconfstr, *asicstr; unsigned char *buf = session->lexer.outbuffer + 3; size_t msg_len = (size_t) getleu16(buf, 1); uint8_t engconf = getub(buf, 3); uint8_t asic = getub(buf, 4); uint8_t swvermaj = getub(buf, 5); uint8_t swvermin = getub(buf, 6); uint16_t dcser = getleu16(buf, 7); uint8_t dcclass = getub(buf, 9); uint16_t rfcser = getleu16(buf, 10); uint8_t rfcclass = getub(buf, 12); uint8_t softtm[17] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; uint8_t bootstr[17] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; uint8_t ioptm[17] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; uint8_t iopvermaj = (uint8_t) 0x00; uint8_t iopvermin = (uint8_t) 0x00; uint8_t picver = (uint8_t) 0x00; uint8_t slsbn = (uint8_t) 0x00; uint8_t iopsbn = (uint8_t) 0x00; memcpy(softtm, &buf[13], 16); memcpy(bootstr, &buf[29], 16); if (msg_len == 0x0037) { /* No IOP */ slsbn = getub(buf, 53); } else { /* IOP Present */ iopvermaj = getub(buf, 53); iopvermin = getub(buf, 54); memcpy(ioptm, &buf[55], 16); picver = getub(buf, 71); slsbn = getub(buf, 72); iopsbn = getub(buf, 73); } switch (engconf) { case 0x00: engconfstr = "Unknown/Undefined"; break; case 0x01: engconfstr = "NCT 2000 S"; break; case 0x02: engconfstr = "NCT 2000 D"; break; case 0x03: engconfstr = "Startfire Single"; break; case 0x04: engconfstr = "Starfire Dual"; break; case 0x05: engconfstr = "Pole Mount RTK (Internal Radio)"; break; case 0x06: engconfstr = "Pole Mount GIS (LBM)"; break; case 0x07: engconfstr = "Black Box RTK (Internal Radio)"; break; case 0x08: engconfstr = "Black Box GIS (LBM)"; break; case 0x80: engconfstr = "R100"; break; case 0x81: engconfstr = "R200"; break; case 0x82: engconfstr = "R210"; break; case 0x83: engconfstr = "R300"; break; case 0x84: engconfstr = "R310"; break; default: engconfstr = "?"; } switch (asic) { case 0x01: asicstr = "A-ASIC"; break; case 0x02: asicstr = "B-ASIC"; break; case 0x03: asicstr = "C-ASIC"; break; case 0x04: asicstr = "M-ASIC"; break; default: asicstr = "?"; } gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0xae (Identification Block)\n"); if (msg_len == 0x0037) { gpsd_log(&session->context->errout, LOG_INF, "Navcom: ID Data: " "%s %s Ver. %u.%u.%u, DC S/N: %u.%u, RF S/N: %u.%u, " "Build ID: %s, Boot software: %s\n", engconfstr, asicstr, swvermaj, swvermin, slsbn, dcser, dcclass, rfcser, rfcclass, softtm, bootstr); } else { gpsd_log(&session->context->errout, LOG_INF, "Navcom: ID Data: " "%s %s Ver. %u.%u.%u, DC S/N: %u.%u, RF S/N: %u.%u, " "Build ID: %s, Boot software: %s, " "IOP Ver.: %u.%u.%u, PIC: %u, IOP Build ID: %s\n", engconfstr, asicstr, swvermaj, swvermin, slsbn, dcser, dcclass, rfcser, rfcclass, softtm, bootstr, iopvermaj, iopvermin, iopsbn, picver, ioptm); } (void)snprintf(session->subtype, sizeof(session->subtype), "%s %s Ver. %u.%u.%u S/N %u.%u %u.%u", engconfstr, asicstr, swvermaj, swvermin, slsbn, dcser, dcclass, rfcser, rfcclass); return DEVICEID_SET; } /* Clock Drift and Offset */ static gps_mask_t handle_0xef(struct gps_device_t *session) { unsigned char *buf = session->lexer.outbuffer + 3; //uint16_t week = getleu16(buf, 3); //uint32_t tow = getleu32(buf, 5); int8_t osc_temp = getsb(buf, 9); uint8_t nav_status = getub(buf, 10); double nav_clock_offset; float nav_clock_drift; float osc_filter_drift_est; int32_t time_slew = (int32_t) getles32(buf, 27); if (sizeof(double) == 8) { nav_clock_offset = getled64((char *)buf, 11); } else { nav_clock_offset = NAN; } if (sizeof(float) == 4) { nav_clock_drift = getlef32((char *)buf, 19); osc_filter_drift_est = getlef32((char *)buf, 23); } else { nav_clock_drift = NAN; osc_filter_drift_est = NAN; } gpsd_log(&session->context->errout, LOG_DATA, "Navcom: oscillator temp. = %d, nav. status = 0x%02x, " "nav. clock offset = %f, nav. clock drift = %f, " "osc. filter drift est. = %f, acc.time slew value = %d\n", osc_temp, nav_status, nav_clock_offset, nav_clock_drift, osc_filter_drift_est, time_slew); gpsd_log(&session->context->errout, LOG_DATA, "CDO 0xef: time=%.2f mask={TIME}\n", session->newdata.time); return 0; } gps_mask_t navcom_parse(struct gps_device_t * session, unsigned char *buf, size_t len) { unsigned char cmd_id; unsigned int msg_len; if (len == 0) return 0; cmd_id = (unsigned char)getub(buf, 3); //payload = &buf[6]; msg_len = (unsigned int) getleu16(buf, 4); gpsd_log(&session->context->errout, LOG_RAW, "Navcom: packet type 0x%02x\n", cmd_id); session->cycle_end_reliable = true; switch (cmd_id) { case 0x06: return handle_0x06(session); case 0x15: return handle_0x15(session); case 0x81: return handle_0x81(session); case 0x83: return handle_0x83(session); case 0x86: return handle_0x86(session); case 0xae: return handle_0xae(session); case 0xb0: return handle_0xb0(session); case 0xb1: return handle_0xb1(session) | (CLEAR_IS | REPORT_IS); case 0xb5: return handle_0xb5(session); case 0xd3: return handle_0xd3(session); case 0xef: return handle_0xef(session); default: gpsd_log(&session->context->errout, LOG_PROG, "Navcom: received packet type 0x%02x, length %d - unknown or unimplemented\n", cmd_id, msg_len); return 0; } } static gps_mask_t navcom_parse_input(struct gps_device_t *session) { if (session->lexer.type == NAVCOM_PACKET) { return navcom_parse(session, session->lexer.outbuffer, session->lexer.outbuflen); #ifdef NMEA0183_ENABLE } else if (session->lexer.type == NMEA_PACKET) { return nmea_parse((char *)session->lexer.outbuffer, session);; #endif /* NMEA0183_ENABLE */ } else return 0; } #ifdef CONTROLSEND_ENABLE static ssize_t navcom_control_send(struct gps_device_t *session, char *buf, size_t len) { putbyte(session->msgbuf, 0, 0x02); putbyte(session->msgbuf, 1, 0x99); putbyte(session->msgbuf, 2, 0x66); putbyte(session->msgbuf, 3, buf[0]); /* Cmd ID */ putle16(session->msgbuf, 4, len + 4); /* Length */ memcpy(session->msgbuf, buf + 6, len - 1); putbyte(session->msgbuf, 6 + len, checksum((unsigned char *)session->msgbuf + 3, len + 5)); putbyte(session->msgbuf, 7 + len, 0x03); session->msgbuflen = len + 9; return gpsd_write(session, session->msgbuf, session->msgbuflen); } #endif /* CONTROLSEND_ENABLE */ #ifdef RECONFIGURE_ENABLE static bool navcom_speed(struct gps_device_t *session, speed_t speed, char parity, int stopbits) { /* parity and stopbit switching aren't implemented */ if (parity != session->gpsdata.dev.parity || stopbits != (int)session->gpsdata.dev.parity) { return false; } else { uint8_t port, port_selection; uint8_t baud; if (session->driver.navcom.physical_port == (uint8_t) 0xFF) { /* We still don't know which port we're connected to */ return false; } switch (speed) { /* NOTE - The spec says that certain baud combinations * on ports A and B are not allowed, those are * 1200/115200, 2400/57600, and 2400/115200. * To try and minimise the possibility of those * occurring, we do not allow baud rates below * 4800. We could also disallow 57600 and 115200 * to totally prevent this, but I do not consider * that reasonable. Finding which baud speed the * other port is set at would also be too much * trouble, so we do not do it. */ case 4800: baud = 0x04; break; case 9600: baud = 0x06; break; case 19200: baud = 0x08; break; case 38400: baud = 0x0a; break; case 57600: baud = 0x0c; break; case 115200: baud = 0x0e; break; default: /* Unsupported speed */ return false; } /* Proceed to construct our message */ port = session->driver.navcom.physical_port; port_selection = (port ? port : (uint8_t) 0xff) | baud; /* Send it off */ navcom_cmd_0x11(session, port_selection); /* And cheekily return true, even though we have * no way to know if the speed change succeeded * until and if we receive an ACK (message 0x06), * which will be at the new baud speed if the * command was successful. Bottom line, the client * should requery gpsd to see if the new speed is * different than the old one */ return true; } } #endif /* RECONFIGURE_ENABLE */ /* this is everything we export */ /* *INDENT-OFF* */ const struct gps_type_t driver_navcom = { .type_name = "Navcom NCT", /* full name of type */ .packet_type = NAVCOM_PACKET, /* lexer packet type */ .flags = DRIVER_STICKY, /* remember this */ .trigger = NULL, /* none */ .channels = NAVCOM_CHANNELS, /* 12 L1 + 12 L2 + 2 Inmarsat L-Band */ .probe_detect = NULL, /* no probe */ .get_packet = generic_get, /* use generic one */ .parse_packet = navcom_parse_input, /* parse message packets */ .rtcm_writer = gpsd_write, /* send RTCM data straight */ .init_query = NULL, /* non-perturbing query */ .event_hook = navcom_event_hook, /* lifetime event handler */ #ifdef RECONFIGURE_ENABLE .speed_switcher = navcom_speed, /* we do change baud rates */ .mode_switcher = NULL, /* there is not a mode switcher */ .rate_switcher = NULL, /* no sample-rate switcher */ .min_cycle = 1, /* ignore, no rate switch */ #endif /* RECONFIGURE_ENABLE */ #ifdef CONTROLSEND_ENABLE .control_send = navcom_control_send, /* how to send a control string */ #endif /* CONTROLSEND_ENABLE */ #ifdef TIMEHINT_ENABLE .time_offset = NULL, /* no method for NTP fudge factor */ #endif /* TIMEHINT_ENABLE */ }; /* *INDENT-ON* */ #endif /* defined(NAVCOM_ENABLE) */