/**************************************************************************** * * Copyright (C) 2012 PX4 Development Team. All rights reserved. * Author: Thomas Gubler * Julian Oes * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name PX4 nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /* @file U-Blox protocol implementation */ #include "ubx.h" #include "gps.h" #include #include #include #include #include #include #include #include #include #define UBX_HEALTH_SUCCESS_COUNTER_LIMIT 2 #define UBX_HEALTH_FAIL_COUNTER_LIMIT 2 #define UBX_HEALTH_PROBE_COUNTER_LIMIT 4 #define UBX_BUFFER_SIZE 1000 extern bool gps_mode_try_all; extern bool gps_mode_success; extern bool terminate_gps_thread; extern bool gps_baud_try_all; extern bool gps_verbose; extern int current_gps_speed; pthread_mutex_t *ubx_mutex; gps_bin_ubx_state_t *ubx_state; static struct vehicle_gps_position_s *ubx_gps; //Definitions for ubx, last two bytes are checksum which is calculated below uint8_t UBX_CONFIG_MESSAGE_PRT[] = {0xB5 , 0x62 , 0x06 , 0x00 , 0x14 , 0x00 , 0x01 , 0x00 , 0x00 , 0x00 , 0xD0 , 0x08 , 0x00 , 0x00 , 0x80 , 0x25 , 0x00 , 0x00 , 0x07 , 0x00 , 0x01 , 0x00 , 0x00 , 0x00 , 0x00 , 0x00}; uint8_t UBX_CONFIG_MESSAGE_MSG_NAV_POSLLH[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0x01, 0x02, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00}; uint8_t UBX_CONFIG_MESSAGE_MSG_NAV_TIMEUTC[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0x01, 0x21, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00}; uint8_t UBX_CONFIG_MESSAGE_MSG_NAV_DOP[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0x01, 0x04, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00}; uint8_t UBX_CONFIG_MESSAGE_MSG_NAV_SVINFO[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0x01, 0x30, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00}; uint8_t UBX_CONFIG_MESSAGE_MSG_NAV_SOL[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0x01, 0x06, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00}; uint8_t UBX_CONFIG_MESSAGE_MSG_NAV_VELNED[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0x01, 0x12, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00}; uint8_t UBX_CONFIG_MESSAGE_MSG_RXM_SVSI[] = {0xB5, 0x62, 0x06, 0x01, 0x08, 0x00, 0x02, 0x20, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00}; void ubx_decode_init(void) { ubx_state->ck_a = 0; ubx_state->ck_b = 0; ubx_state->rx_count = 0; ubx_state->decode_state = UBX_DECODE_UNINIT; ubx_state->message_class = CLASS_UNKNOWN; ubx_state->message_id = ID_UNKNOWN; ubx_state->payload_size = 0; ubx_state->print_errors = false; } void ubx_checksum(uint8_t b, uint8_t *ck_a, uint8_t *ck_b) { *(ck_a) = *(ck_a) + b; *(ck_b) = *(ck_b) + *(ck_a); } int ubx_parse(uint8_t b, char *gps_rx_buffer) { // printf("b=%x\n",b); if (ubx_state->decode_state == UBX_DECODE_UNINIT) { if (b == 0xb5) { ubx_state->decode_state = UBX_DECODE_GOT_SYNC1; } } else if (ubx_state->decode_state == UBX_DECODE_GOT_SYNC1) { if (b == 0x62) { ubx_state->decode_state = UBX_DECODE_GOT_SYNC2; } else { // Second start symbol was wrong, reset state machine ubx_decode_init(); } } else if (ubx_state->decode_state == UBX_DECODE_GOT_SYNC2) { // Add to checksum ubx_checksum(b, &(ubx_state->ck_a), &(ubx_state->ck_b)); //check for known class switch (b) { case UBX_CLASS_NAV: //NAV ubx_state->decode_state = UBX_DECODE_GOT_CLASS; ubx_state->message_class = NAV; break; case UBX_CLASS_RXM: //RXM ubx_state->decode_state = UBX_DECODE_GOT_CLASS; ubx_state->message_class = RXM; break; default: //unknown class: reset state machine ubx_decode_init(); break; } } else if (ubx_state->decode_state == UBX_DECODE_GOT_CLASS) { // Add to checksum ubx_checksum(b, &(ubx_state->ck_a), &(ubx_state->ck_b)); //depending on class look for message id switch (ubx_state->message_class) { case NAV: switch (b) { case UBX_MESSAGE_NAV_POSLLH: //NAV-POSLLH: Geodetic Position Solution ubx_state->decode_state = UBX_DECODE_GOT_MESSAGEID; ubx_state->message_id = NAV_POSLLH; break; case UBX_MESSAGE_NAV_SOL: ubx_state->decode_state = UBX_DECODE_GOT_MESSAGEID; ubx_state->message_id = NAV_SOL; break; case UBX_MESSAGE_NAV_TIMEUTC: ubx_state->decode_state = UBX_DECODE_GOT_MESSAGEID; ubx_state->message_id = NAV_TIMEUTC; break; case UBX_MESSAGE_NAV_DOP: ubx_state->decode_state = UBX_DECODE_GOT_MESSAGEID; ubx_state->message_id = NAV_DOP; break; case UBX_MESSAGE_NAV_SVINFO: ubx_state->decode_state = UBX_DECODE_GOT_MESSAGEID; ubx_state->message_id = NAV_SVINFO; break; case UBX_MESSAGE_NAV_VELNED: ubx_state->decode_state = UBX_DECODE_GOT_MESSAGEID; ubx_state->message_id = NAV_VELNED; break; default: //unknown class: reset state machine, should not happen ubx_decode_init(); break; } break; case RXM: switch (b) { case UBX_MESSAGE_RXM_SVSI: ubx_state->decode_state = UBX_DECODE_GOT_MESSAGEID; ubx_state->message_id = RXM_SVSI; break; default: //unknown class: reset state machine, should not happen ubx_decode_init(); break; } break; default: //should not happen ubx_decode_init(); break; } } else if (ubx_state->decode_state == UBX_DECODE_GOT_MESSAGEID) { // Add to checksum ubx_checksum(b, &(ubx_state->ck_a), &(ubx_state->ck_b)); ubx_state->payload_size = b; ubx_state->decode_state = UBX_DECODE_GOT_LENGTH1; } else if (ubx_state->decode_state == UBX_DECODE_GOT_LENGTH1) { // Add to checksum ubx_checksum(b, &(ubx_state->ck_a), &(ubx_state->ck_b)); ubx_state->payload_size += b << 8; ubx_state->decode_state = UBX_DECODE_GOT_LENGTH2; } else if (ubx_state->decode_state == UBX_DECODE_GOT_LENGTH2) { uint8_t ret = 0; // Add to checksum if not yet at checksum byte if (ubx_state->rx_count < ubx_state->payload_size) ubx_checksum(b, &(ubx_state->ck_a), &(ubx_state->ck_b)); // Fill packet buffer gps_rx_buffer[ubx_state->rx_count] = b; //if whole payload + checksum is in buffer: if (ubx_state->rx_count >= ubx_state->payload_size + 1) { //convert to correct struct switch (ubx_state->message_id) { //this enum is unique for all ids --> no need to check the class case NAV_POSLLH: { // printf("GOT NAV_POSLLH MESSAGE\n"); gps_bin_nav_posllh_packet_t *packet = (gps_bin_nav_posllh_packet_t *) gps_rx_buffer; //Check if checksum is valid and the store the gps information if (ubx_state->ck_a == packet->ck_a && ubx_state->ck_b == packet->ck_b) { ubx_gps->lat = packet->lat; ubx_gps->lon = packet->lon; ubx_gps->alt = packet->height_msl; ubx_gps->counter_pos_valid++; ubx_gps->timestamp = hrt_absolute_time(); ubx_gps->counter++; //pthread_mutex_lock(ubx_mutex); ubx_state->last_message_timestamps[NAV_POSLLH - 1] = hrt_absolute_time(); //pthread_mutex_unlock(ubx_mutex); ret = 1; } else { if (gps_verbose) printf("[gps] NAV_POSLLH: checksum invalid\n"); ret = 0; } // Reset state machine to decode next packet ubx_decode_init(); return ret; break; } case NAV_SOL: { // printf("GOT NAV_SOL MESSAGE\n"); gps_bin_nav_sol_packet_t *packet = (gps_bin_nav_sol_packet_t *) gps_rx_buffer; //Check if checksum is valid and the store the gps information if (ubx_state->ck_a == packet->ck_a && ubx_state->ck_b == packet->ck_b) { ubx_gps->fix_type = packet->gpsFix; ubx_gps->timestamp = hrt_absolute_time(); ubx_gps->counter++; //pthread_mutex_lock(ubx_mutex); ubx_state->last_message_timestamps[NAV_SOL - 1] = hrt_absolute_time(); //pthread_mutex_unlock(ubx_mutex); ret = 1; } else { if (gps_verbose) printf("[gps] NAV_SOL: checksum invalid\n"); ret = 0; } // Reset state machine to decode next packet ubx_decode_init(); return ret; break; } case NAV_DOP: { // printf("GOT NAV_DOP MESSAGE\n"); gps_bin_nav_dop_packet_t *packet = (gps_bin_nav_dop_packet_t *) gps_rx_buffer; //Check if checksum is valid and the store the gps information if (ubx_state->ck_a == packet->ck_a && ubx_state->ck_b == packet->ck_b) { ubx_gps->eph = packet->hDOP; ubx_gps->epv = packet->vDOP; ubx_gps->timestamp = hrt_absolute_time(); ubx_gps->counter++; //pthread_mutex_lock(ubx_mutex); ubx_state->last_message_timestamps[NAV_DOP - 1] = hrt_absolute_time(); //pthread_mutex_unlock(ubx_mutex); ret = 1; } else { if (gps_verbose) printf("[gps] NAV_DOP: checksum invalid\n"); ret = 0; } // Reset state machine to decode next packet ubx_decode_init(); return ret; break; } case NAV_TIMEUTC: { // printf("GOT NAV_TIMEUTC MESSAGE\n"); gps_bin_nav_timeutc_packet_t *packet = (gps_bin_nav_timeutc_packet_t *) gps_rx_buffer; //Check if checksum is valid and the store the gps information if (ubx_state->ck_a == packet->ck_a && ubx_state->ck_b == packet->ck_b) { //convert to unix timestamp struct tm timeinfo; timeinfo.tm_year = packet->year - 1900; timeinfo.tm_mon = packet->month - 1; timeinfo.tm_mday = packet->day; timeinfo.tm_hour = packet->hour; timeinfo.tm_min = packet->min; timeinfo.tm_sec = packet->sec; time_t epoch = mktime(&timeinfo); // printf("%d.%d.%d %d:%d:%d:%d\n", timeinfo.tm_year, timeinfo.tm_mon, timeinfo.tm_mday, timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec, packet->time_nanoseconds); ubx_gps->time_gps_usec = (uint64_t)epoch * 1000000; //TODO: test this ubx_gps->time_gps_usec += (uint64_t)(packet->time_nanoseconds * 1e-3f); ubx_gps->timestamp = hrt_absolute_time(); ubx_gps->counter++; //pthread_mutex_lock(ubx_mutex); ubx_state->last_message_timestamps[NAV_TIMEUTC - 1] = hrt_absolute_time(); //pthread_mutex_unlock(ubx_mutex); ret = 1; } else { if (gps_verbose) printf("\t[gps] NAV_TIMEUTC: checksum invalid\n"); ret = 0; } // Reset state machine to decode next packet ubx_decode_init(); return ret; break; } case NAV_SVINFO: { // printf("GOT NAV_SVINFO MESSAGE\n"); //this is a more complicated message: the length depends on the number of satellites. This number is extracted from the first part of the message const int length_part1 = 8; char gps_rx_buffer_part1[length_part1]; memcpy(gps_rx_buffer_part1, gps_rx_buffer, length_part1); gps_bin_nav_svinfo_part1_packet_t *packet_part1 = (gps_bin_nav_svinfo_part1_packet_t *) gps_rx_buffer_part1; //read checksum const int length_part3 = 2; char gps_rx_buffer_part3[length_part3]; memcpy(gps_rx_buffer_part3, &(gps_rx_buffer[ubx_state->rx_count - 1]), length_part3); gps_bin_nav_svinfo_part3_packet_t *packet_part3 = (gps_bin_nav_svinfo_part3_packet_t *) gps_rx_buffer_part3; //Check if checksum is valid and then store the gps information if (ubx_state->ck_a == packet_part3->ck_a && ubx_state->ck_b == packet_part3->ck_b) { //definitions needed to read numCh elements from the buffer: const int length_part2 = 12; gps_bin_nav_svinfo_part2_packet_t *packet_part2; char gps_rx_buffer_part2[length_part2]; //for temporal storage int i; for (i = 0; i < packet_part1->numCh; i++) { //for each channel /* Get satellite information from the buffer */ memcpy(gps_rx_buffer_part2, &(gps_rx_buffer[length_part1 + i * length_part2]), length_part2); packet_part2 = (gps_bin_nav_svinfo_part2_packet_t *) gps_rx_buffer_part2; /* Write satellite information in the global storage */ ubx_gps->satellite_prn[i] = packet_part2->svid; //if satellite information is healthy store the data uint8_t unhealthy = packet_part2->flags & 1 << 4; //flags is a bitfield if (!unhealthy) { if ((packet_part2->flags) & 1) { //flags is a bitfield ubx_gps->satellite_used[i] = 1; } else { ubx_gps->satellite_used[i] = 0; } ubx_gps->satellite_snr[i] = packet_part2->cno; ubx_gps->satellite_elevation[i] = (uint8_t)(packet_part2->elev); ubx_gps->satellite_azimuth[i] = (uint8_t)((float)packet_part2->azim * 255.0f / 360.0f); } else { ubx_gps->satellite_used[i] = 0; ubx_gps->satellite_snr[i] = 0; ubx_gps->satellite_elevation[i] = 0; ubx_gps->satellite_azimuth[i] = 0; } } for (i = packet_part1->numCh; i < 20; i++) { //these channels are unused /* Unused channels have to be set to zero for e.g. MAVLink */ ubx_gps->satellite_prn[i] = 0; ubx_gps->satellite_used[i] = 0; ubx_gps->satellite_snr[i] = 0; ubx_gps->satellite_elevation[i] = 0; ubx_gps->satellite_azimuth[i] = 0; } /* set flag if any sat info is available */ if (!packet_part1->numCh > 0) { ubx_gps->satellite_info_available = 1; } else { ubx_gps->satellite_info_available = 0; } ubx_gps->timestamp = hrt_absolute_time(); ubx_gps->counter++; //pthread_mutex_lock(ubx_mutex); ubx_state->last_message_timestamps[NAV_SVINFO - 1] = hrt_absolute_time(); //pthread_mutex_unlock(ubx_mutex); ret = 1; } else { if (gps_verbose) printf("\t[gps] NAV_SVINFO: checksum invalid\n"); ret = 0; } // Reset state machine to decode next packet ubx_decode_init(); return ret; break; } case NAV_VELNED: { // printf("GOT NAV_VELNED MESSAGE\n"); gps_bin_nav_velned_packet_t *packet = (gps_bin_nav_velned_packet_t *) gps_rx_buffer; //Check if checksum is valid and the store the gps information if (ubx_state->ck_a == packet->ck_a && ubx_state->ck_b == packet->ck_b) { ubx_gps->vel = (uint16_t)packet->speed; ubx_gps->vel_n = packet->velN / 100.0f; ubx_gps->vel_e = packet->velE / 100.0f; ubx_gps->vel_d = packet->velD / 100.0f; ubx_gps->vel_ned_valid = true; ubx_gps->cog = (uint16_t)((float)(packet->heading) * 1e-3f); ubx_gps->timestamp = hrt_absolute_time(); ubx_gps->counter++; //pthread_mutex_lock(ubx_mutex); ubx_state->last_message_timestamps[NAV_VELNED - 1] = hrt_absolute_time(); //pthread_mutex_unlock(ubx_mutex); ret = 1; } else { if (gps_verbose) printf("[gps] NAV_VELNED: checksum invalid\n"); ret = 0; } // Reset state machine to decode next packet ubx_decode_init(); return ret; break; } case RXM_SVSI: { // printf("GOT RXM_SVSI MESSAGE\n"); const int length_part1 = 7; char gps_rx_buffer_part1[length_part1]; memcpy(gps_rx_buffer_part1, gps_rx_buffer, length_part1); gps_bin_rxm_svsi_packet_t *packet = (gps_bin_rxm_svsi_packet_t *) gps_rx_buffer_part1; //Check if checksum is valid and the store the gps information if (ubx_state->ck_a == gps_rx_buffer[ubx_state->rx_count - 1] && ubx_state->ck_b == gps_rx_buffer[ubx_state->rx_count]) { ubx_gps->satellites_visible = packet->numVis; ubx_gps->timestamp = hrt_absolute_time(); ubx_gps->counter++; //pthread_mutex_lock(ubx_mutex); ubx_state->last_message_timestamps[RXM_SVSI - 1] = hrt_absolute_time(); //pthread_mutex_unlock(ubx_mutex); ret = 1; } else { if (gps_verbose) printf("[gps] RXM_SVSI: checksum invalid\n"); ret = 0; } // Reset state machine to decode next packet ubx_decode_init(); return ret; break; } default: //something went wrong ubx_decode_init(); break; } } (ubx_state->rx_count)++; } return 0; // no valid packet found } void calculate_ubx_checksum(uint8_t *message, uint8_t length) { uint8_t ck_a = 0; uint8_t ck_b = 0; int i; for (i = 2; i < length - 2; i++) { ck_a = ck_a + message[i]; ck_b = ck_b + ck_a; } message[length - 2] = ck_a; message[length - 1] = ck_b; // printf("[%x,%x]", ck_a, ck_b); // printf("[%x,%x]\n", message[length-2], message[length-1]); } int configure_gps_ubx(int *fd) { //fflush(((FILE *)fd)); //TODO: write this in a loop once it is tested //UBX_CFG_PRT_PART: write_config_message_ubx(UBX_CONFIG_MESSAGE_PRT, sizeof(UBX_CONFIG_MESSAGE_PRT) / sizeof(uint8_t) , *fd); usleep(100000); //NAV_POSLLH: write_config_message_ubx(UBX_CONFIG_MESSAGE_MSG_NAV_POSLLH, sizeof(UBX_CONFIG_MESSAGE_MSG_NAV_POSLLH) / sizeof(uint8_t) , *fd); usleep(100000); //NAV_TIMEUTC: write_config_message_ubx(UBX_CONFIG_MESSAGE_MSG_NAV_TIMEUTC, sizeof(UBX_CONFIG_MESSAGE_MSG_NAV_TIMEUTC) / sizeof(uint8_t) , *fd); usleep(100000); //NAV_DOP: write_config_message_ubx(UBX_CONFIG_MESSAGE_MSG_NAV_DOP, sizeof(UBX_CONFIG_MESSAGE_MSG_NAV_DOP) / sizeof(uint8_t) , *fd); usleep(100000); //NAV_SOL: write_config_message_ubx(UBX_CONFIG_MESSAGE_MSG_NAV_SOL, sizeof(UBX_CONFIG_MESSAGE_MSG_NAV_SOL) / sizeof(uint8_t) , *fd); usleep(100000); //NAV_SVINFO: write_config_message_ubx(UBX_CONFIG_MESSAGE_MSG_NAV_SVINFO, sizeof(UBX_CONFIG_MESSAGE_MSG_NAV_SVINFO) / sizeof(uint8_t) , *fd); usleep(100000); //NAV_VELNED: write_config_message_ubx(UBX_CONFIG_MESSAGE_MSG_NAV_VELNED, sizeof(UBX_CONFIG_MESSAGE_MSG_NAV_VELNED) / sizeof(uint8_t) , *fd); usleep(100000); //RXM_SVSI: write_config_message_ubx(UBX_CONFIG_MESSAGE_MSG_RXM_SVSI, sizeof(UBX_CONFIG_MESSAGE_MSG_RXM_SVSI) / sizeof(uint8_t) , *fd); usleep(100000); return 0; } int read_gps_ubx(int *fd, char *gps_rx_buffer, int buffer_size) { uint8_t ret = 0; uint8_t c; int rx_count = 0; int gpsRxOverflow = 0; struct pollfd fds; fds.fd = *fd; fds.events = POLLIN; // UBX GPS mode // This blocks the task until there is something on the buffer while (1) { //check if the thread should terminate if (terminate_gps_thread == true) { // printf("terminate_gps_thread=%u ", terminate_gps_thread); // printf("exiting mtk thread\n"); // fflush(stdout); ret = 1; break; } if (poll(&fds, 1, 1000) > 0) { if (read(*fd, &c, 1) > 0) { // printf("Read %x\n",c); if (rx_count >= buffer_size) { // The buffer is already full and we haven't found a valid ubx sentence. // Flush the buffer and note the overflow event. gpsRxOverflow++; rx_count = 0; ubx_decode_init(); if (gps_verbose) printf("[gps] Buffer full\n"); } else { //gps_rx_buffer[rx_count] = c; rx_count++; } int msg_read = ubx_parse(c, gps_rx_buffer); if (msg_read > 0) { // printf("Found sequence\n"); break; } } else { break; } } else { break; } } return ret; } int write_config_message_ubx(uint8_t *message, size_t length, int fd) { //calculate and write checksum to the end uint8_t ck_a = 0; uint8_t ck_b = 0; unsigned int i; for (i = 2; i < length; i++) { ck_a = ck_a + message[i]; ck_b = ck_b + ck_a; } // printf("[%x,%x]\n", ck_a, ck_b); unsigned int result_write = write(fd, message, length); result_write += write(fd, &ck_a, 1); result_write += write(fd, &ck_b, 1); fsync(fd); return (result_write != length + 2); //return 0 as success } void *ubx_watchdog_loop(void *args) { /* Set thread name */ prctl(PR_SET_NAME, "gps ubx watchdog", getpid()); /* Retrieve file descriptor and thread flag */ struct arg_struct *arguments = (struct arg_struct *)args; int *fd = arguments->fd_ptr; bool *thread_should_exit = arguments->thread_should_exit_ptr; /* GPS watchdog error message skip counter */ bool ubx_healthy = false; uint8_t ubx_fail_count = 0; uint8_t ubx_success_count = 0; bool once_ok = false; int mavlink_fd = open(MAVLINK_LOG_DEVICE, 0); //int err_skip_counter = 0; while (!(*thread_should_exit)) { /* if some values are to old reconfigure gps */ int i; pthread_mutex_lock(ubx_mutex); bool all_okay = true; uint64_t timestamp_now = hrt_absolute_time(); for (i = 0; i < UBX_NO_OF_MESSAGES; i++) { // printf("timestamp_now=%llu\n", timestamp_now); // printf("last_message_timestamps=%llu\n", ubx_state->last_message_timestamps[i]); if (timestamp_now - ubx_state->last_message_timestamps[i] > UBX_WATCHDOG_CRITICAL_TIME_MICROSECONDS) { //printf("Warning: GPS ubx message %d not received for a long time\n", i); all_okay = false; } } pthread_mutex_unlock(ubx_mutex); if (!all_okay) { /* gps error */ ubx_fail_count++; // if (err_skip_counter == 0) // { // printf("GPS Watchdog detected gps not running or having problems\n"); // err_skip_counter = 20; // } // err_skip_counter--; //printf("gps_mode_try_all =%u, ubx_fail_count=%u, ubx_healthy=%u, once_ok=%u\n", gps_mode_try_all, ubx_fail_count, ubx_healthy, once_ok); /* If we have too many failures and another mode or baud should be tried, exit... */ if ((gps_mode_try_all == true || gps_baud_try_all == true) && (ubx_fail_count >= UBX_HEALTH_PROBE_COUNTER_LIMIT) && (ubx_healthy == false) && once_ok == false) { if (gps_verbose) printf("[gps] Connection attempt failed, no UBX module found\n"); gps_mode_success = false; break; } if (ubx_healthy && ubx_fail_count == UBX_HEALTH_FAIL_COUNTER_LIMIT) { printf("[gps] ERROR: UBX GPS module stopped responding\n"); // global_data_send_subsystem_info(&ubx_present_enabled); mavlink_log_critical(mavlink_fd, "[gps] UBX module stopped responding\n"); ubx_healthy = false; ubx_success_count = 0; } /* trying to reconfigure the gps configuration */ configure_gps_ubx(fd); fflush(stdout); sleep(1); } else { /* gps healthy */ ubx_success_count++; ubx_healthy = true; ubx_fail_count = 0; if (!ubx_healthy && ubx_success_count == UBX_HEALTH_SUCCESS_COUNTER_LIMIT) { //printf("[gps] ublox UBX module status ok (baud=%d)\r\n", current_gps_speed); // global_data_send_subsystem_info(&ubx_present_enabled_healthy); mavlink_log_info(mavlink_fd, "[gps] UBX module found, status ok\n"); ubx_healthy = true; ubx_fail_count = 0; once_ok = true; } } usleep(UBX_WATCHDOG_WAIT_TIME_MICROSECONDS); } if(gps_verbose) printf("[gps] ubx loop is going to terminate\n"); close(mavlink_fd); return NULL; } void *ubx_loop(void *args) { /* Set thread name */ prctl(PR_SET_NAME, "gps ubx read", getpid()); /* Retrieve file descriptor and thread flag */ struct arg_struct *arguments = (struct arg_struct *)args; int *fd = arguments->fd_ptr; bool *thread_should_exit = arguments->thread_should_exit_ptr; /* Initialize gps stuff */ char gps_rx_buffer[UBX_BUFFER_SIZE]; if (gps_verbose) printf("[gps] UBX protocol driver starting..\n"); //set parameters for ubx_state //ubx state ubx_state = malloc(sizeof(gps_bin_ubx_state_t)); //printf("gps: ubx_state created\n"); ubx_decode_init(); ubx_state->print_errors = false; /* set parameters for ubx */ if (configure_gps_ubx(fd) != 0) { printf("[gps] Configuration of gps module to ubx failed\n"); /* Write shared variable sys_status */ // TODO enable this again //global_data_send_subsystem_info(&ubx_present); } else { if (gps_verbose) printf("[gps] Attempting to configure GPS to UBX binary protocol\n"); // XXX Shouldn't the system status only change if the module is known to work ok? /* Write shared variable sys_status */ // TODO enable this again //global_data_send_subsystem_info(&ubx_present_enabled); } struct vehicle_gps_position_s ubx_gps_d = {.counter = 0}; ubx_gps = &ubx_gps_d; orb_advert_t gps_pub = orb_advertise(ORB_ID(vehicle_gps_position), &ubx_gps); while (!(*thread_should_exit)) { /* Parse a message from the gps receiver */ if (0 == read_gps_ubx(fd, gps_rx_buffer, UBX_BUFFER_SIZE)) { /* publish new GPS position */ orb_publish(ORB_ID(vehicle_gps_position), gps_pub, ubx_gps); } else { /* de-advertise */ close(gps_pub); break; } } if(gps_verbose) printf("[gps] ubx read is going to terminate\n"); close(gps_pub); return NULL; }