2010-09-06 17:16:50 -03:00
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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: t -*-
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2010-09-06 19:31:18 -03:00
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//
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// u-blox UBX GPS driver for ArduPilot and ArduPilotMega.
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// Code by Michael Smith, Jordi Munoz and Jose Julio, DIYDrones.com
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//
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// This library is free software; you can redistribute it and / or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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2010-09-06 17:16:50 -03:00
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2012-06-08 03:39:12 -03:00
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#define UBLOX_DEBUGGING 0
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#if UBLOX_DEBUGGING
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#include <FastSerial.h>
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# define Debug(fmt, args...) do {Serial.printf("%s:%d: " fmt "\n", __FUNCTION__, __LINE__ , ##args); delay(0); } while(0)
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#else
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# define Debug(fmt, args...)
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#endif
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2010-09-06 17:16:50 -03:00
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#include "AP_GPS_UBLOX.h"
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2010-12-24 02:35:09 -04:00
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#include <stdint.h>
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2010-09-06 17:16:50 -03:00
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2012-06-08 03:39:12 -03:00
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2010-09-06 17:16:50 -03:00
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// Constructors ////////////////////////////////////////////////////////////////
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2010-09-06 19:31:18 -03:00
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2010-09-06 17:16:50 -03:00
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AP_GPS_UBLOX::AP_GPS_UBLOX(Stream *s) : GPS(s)
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{
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}
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2010-09-06 19:31:18 -03:00
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// Public Methods //////////////////////////////////////////////////////////////
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2010-09-06 17:16:50 -03:00
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2010-12-24 02:35:09 -04:00
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void
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AP_GPS_UBLOX::init(void)
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2010-09-06 17:16:50 -03:00
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{
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2011-10-28 15:52:50 -03:00
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// XXX it might make sense to send some CFG_MSG,CFG_NMEA messages to get the
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// right reporting configuration.
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2010-10-17 03:06:04 -03:00
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2011-10-28 15:52:50 -03:00
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_port->flush();
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_epoch = TIME_OF_WEEK;
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idleTimeout = 1200;
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2010-09-06 17:16:50 -03:00
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}
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2010-09-06 19:31:18 -03:00
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// Process bytes available from the stream
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//
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// The stream is assumed to contain only messages we recognise. If it
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// contains other messages, and those messages contain the preamble
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// bytes, it is possible for this code to fail to synchronise to the
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// stream immediately. Without buffering the entire message and
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// re-processing it from the top, this is unavoidable. The parser
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// attempts to avoid this when possible.
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//
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2010-12-24 02:35:09 -04:00
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bool
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AP_GPS_UBLOX::read(void)
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{
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uint8_t data;
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int numc;
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bool parsed = false;
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numc = _port->available();
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for (int i = 0; i < numc; i++) { // Process bytes received
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// read the next byte
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data = _port->read();
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switch(_step) {
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// Message preamble detection
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//
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// If we fail to match any of the expected bytes, we reset
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// the state machine and re-consider the failed byte as
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// the first byte of the preamble. This improves our
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// chances of recovering from a mismatch and makes it less
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// likely that we will be fooled by the preamble appearing
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// as data in some other message.
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//
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case 1:
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if (PREAMBLE2 == data) {
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_step++;
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break;
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}
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_step = 0;
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Debug("reset %u", __LINE__);
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// FALLTHROUGH
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case 0:
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if(PREAMBLE1 == data)
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_step++;
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break;
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// Message header processing
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//
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// We sniff the class and message ID to decide whether we
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// are going to gather the message bytes or just discard
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// them.
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//
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// We always collect the length so that we can avoid being
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// fooled by preamble bytes in messages.
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//
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case 2:
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_step++;
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if (CLASS_NAV == data) {
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_gather = true; // class is interesting, maybe gather
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} else {
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_gather = false; // class is not interesting, discard
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Debug("not interesting class=0x%x", data);
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}
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2012-06-08 03:39:12 -03:00
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_ck_b = _ck_a = data; // reset the checksum accumulators
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break;
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case 3:
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_step++;
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_ck_b += (_ck_a += data); // checksum byte
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_msg_id = data;
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if (_gather) { // if class was interesting
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switch(data) {
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case MSG_POSLLH: // message is interesting
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_expect = sizeof(ubx_nav_posllh);
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break;
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case MSG_STATUS:
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_expect = sizeof(ubx_nav_status);
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break;
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case MSG_SOL:
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_expect = sizeof(ubx_nav_solution);
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break;
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case MSG_VELNED:
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_expect = sizeof(ubx_nav_velned);
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break;
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default:
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_gather = false; // message is not interesting
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}
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2012-06-08 03:39:12 -03:00
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} else {
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Debug("not interesting msg_id 0x%x", _msg_id);
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}
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2011-10-28 15:52:50 -03:00
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break;
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case 4:
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_step++;
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_ck_b += (_ck_a += data); // checksum byte
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_payload_length = data; // payload length low byte
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break;
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case 5:
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_step++;
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_ck_b += (_ck_a += data); // checksum byte
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_payload_length += (uint16_t)data; // payload length high byte
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_payload_counter = 0; // prepare to receive payload
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2012-06-08 03:39:12 -03:00
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if (_payload_length != _expect && _gather) {
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Debug("bad length _payload_length=%u _expect=%u", _payload_length, _expect);
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_gather = false;
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}
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break;
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// Receive message data
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//
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case 6:
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_ck_b += (_ck_a += data); // checksum byte
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if (_gather) // gather data if requested
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_buffer.bytes[_payload_counter] = data;
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if (++_payload_counter == _payload_length)
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_step++;
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break;
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// Checksum and message processing
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//
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case 7:
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_step++;
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2012-06-08 03:39:12 -03:00
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if (_ck_a != data) {
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Debug("bad cka %x should be %x", data, _ck_a);
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2011-10-28 15:52:50 -03:00
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_step = 0; // bad checksum
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}
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break;
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case 8:
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_step = 0;
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2012-06-08 03:39:12 -03:00
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if (_ck_b != data) {
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Debug("bad ckb %x should be %x", data, _ck_b);
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2011-10-28 15:52:50 -03:00
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break; // bad checksum
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}
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2011-10-28 15:52:50 -03:00
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2012-06-08 03:39:12 -03:00
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if (_gather && _parse_gps()) {
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parsed = true;
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2011-10-28 15:52:50 -03:00
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}
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}
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}
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Debug("parsed = %u", (unsigned)parsed);
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return parsed;
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2010-09-06 17:16:50 -03:00
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}
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2010-09-06 19:31:18 -03:00
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// Private Methods /////////////////////////////////////////////////////////////
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2010-12-24 02:35:09 -04:00
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bool
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2010-09-06 19:31:18 -03:00
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AP_GPS_UBLOX::_parse_gps(void)
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{
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2011-10-28 15:52:50 -03:00
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switch (_msg_id) {
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case MSG_POSLLH:
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Debug("MSG_POSLLH next_fix=%u", next_fix);
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time = _buffer.posllh.time;
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longitude = _buffer.posllh.longitude;
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latitude = _buffer.posllh.latitude;
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altitude = _buffer.posllh.altitude_msl / 10;
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2012-06-04 01:47:58 -03:00
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fix = next_fix;
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2012-06-08 03:39:12 -03:00
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_new_position = true;
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break;
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2011-10-28 15:52:50 -03:00
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case MSG_STATUS:
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2012-06-08 03:39:12 -03:00
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Debug("MSG_STATUS fix_status=%u fix_type=%u",
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_buffer.status.fix_status,
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_buffer.status.fix_type);
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2012-06-04 01:47:58 -03:00
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next_fix = (_buffer.status.fix_status & NAV_STATUS_FIX_VALID) && (_buffer.status.fix_type == FIX_3D);
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if (!next_fix) {
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fix = false;
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}
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2011-10-28 15:52:50 -03:00
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break;
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case MSG_SOL:
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Debug("MSG_SOL fix_status=%u fix_type=%u",
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_buffer.solution.fix_status,
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_buffer.solution.fix_type);
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2012-06-04 01:47:58 -03:00
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next_fix = (_buffer.solution.fix_status & NAV_STATUS_FIX_VALID) && (_buffer.solution.fix_type == FIX_3D);
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if (!next_fix) {
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fix = false;
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}
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2011-10-28 15:52:50 -03:00
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num_sats = _buffer.solution.satellites;
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hdop = _buffer.solution.position_DOP;
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break;
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case MSG_VELNED:
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Debug("MSG_VELNED");
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2011-10-28 15:52:50 -03:00
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speed_3d = _buffer.velned.speed_3d; // cm/s
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ground_speed = _buffer.velned.speed_2d; // cm/s
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ground_course = _buffer.velned.heading_2d / 1000; // Heading 2D deg * 100000 rescaled to deg * 100
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2012-06-08 03:39:12 -03:00
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_new_speed = true;
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2011-10-28 15:52:50 -03:00
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break;
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default:
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return false;
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}
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2012-06-08 03:39:12 -03:00
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// we only return true when we get new position and speed data
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// this ensures we don't use stale data
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if (_new_position && _new_speed) {
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_new_speed = _new_position = false;
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return true;
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}
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return false;
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2010-09-06 17:16:50 -03:00
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}
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