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ardupilot/libraries/AP_GPS/AP_GPS.cpp

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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
/*
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <AP_Common.h>
#include <AP_Math.h>
#include <AP_HAL.h>
#include <AP_Notify.h>
#include <AP_GPS.h>
extern const AP_HAL::HAL& hal;
// table of user settable parameters
const AP_Param::GroupInfo AP_GPS::var_info[] PROGMEM = {
// @Param: TYPE
// @DisplayName: GPS type
// @Description: GPS type
// @Values: 0:None,1:AUTO,2:uBlox,3:MTK,4:MTK19,5:NMEA,6:SiRF,7:HIL,8:SwiftNav,9:PX4EXPERIMENTAL
AP_GROUPINFO("TYPE", 0, AP_GPS, _type[0], 1),
#if GPS_MAX_INSTANCES > 1
// @Param: TYPE2
// @DisplayName: 2nd GPS type
// @Description: GPS type of 2nd GPS
// @Values: 0:None,1:AUTO,2:uBlox,3:MTK,4:MTK19,5:NMEA,6:SiRF,7:HIL,8:SwiftNav,9:PX4EXPERIMENTAL
AP_GROUPINFO("TYPE2", 1, AP_GPS, _type[1], 0),
#endif
// @Param: NAVFILTER
// @DisplayName: Navigation filter setting
// @Description: Navigation filter engine setting
// @Values: 0:Portable,2:Stationary,3:Pedestrian,4:Automotive,5:Sea,6:Airborne1G,7:Airborne2G,8:Airborne4G
AP_GROUPINFO("NAVFILTER", 2, AP_GPS, _navfilter, GPS_ENGINE_AIRBORNE_4G),
#if GPS_MAX_INSTANCES > 1
// @Param: AUTO_SWITCH
// @DisplayName: Automatic Switchover Setting
// @Description: Automatic switchover to GPS reporting best lock
// @Values: 0:Disabled,1:Enabled
// @User: Advanced
AP_GROUPINFO("AUTO_SWITCH", 3, AP_GPS, _auto_switch, 1),
#endif
#if GPS_RTK_AVAILABLE
// @Param: DGPS_MIN_LOCK
// @DisplayName: Minimum Lock Type Accepted for DGPS
// @Description: Sets the minimum type of differential GPS corrections required before allowing to switch into DGPS mode.
// @Values: 0:Any,50:FloatRTK,100:IntegerRTK
// @User: Advanced
AP_GROUPINFO("MIN_DGPS", 4, AP_GPS, _min_dgps, 100),
#endif
// @Param: SBAS_MODE
// @DisplayName: SBAS Mode
// @Description: This sets the SBAS (satellite based augmentation system) mode if available on this GPS. If set to 2 then the SBAS mode is not changed in the GPS. Otherwise the GPS will be reconfigured to enable/disable SBAS. Disabling SBAS may be worthwhile in some parts of the world where an SBAS signal is available but the baseline is too long to be useful.
// @Values: 0:Disabled,1:Enabled,2:NoChange
// @User: Advanced
AP_GROUPINFO("SBAS_MODE", 5, AP_GPS, _sbas_mode, 2),
// @Param: MIN_ELEV
// @DisplayName: Minimum elevation
// @Description: This sets the minimum elevation of satellites above the horizon for them to be used for navigation. Setting this to -100 leaves the minimum elevation set to the GPS modules default.
// @Range: -100 90
// @Units: Degrees
// @User: Advanced
AP_GROUPINFO("MIN_ELEV", 6, AP_GPS, _min_elevation, -100),
AP_GROUPEND
};
/// Startup initialisation.
void AP_GPS::init(DataFlash_Class *dataflash, const AP_SerialManager& serial_manager)
{
_DataFlash = dataflash;
primary_instance = 0;
// search for serial ports with gps protocol
_port[0] = serial_manager.find_serial(AP_SerialManager::SerialProtocol_GPS);
#if GPS_MAX_INSTANCES > 1
_port[1] = serial_manager.find_serial(AP_SerialManager::SerialProtocol_GPS2);
#endif
}
// baudrates to try to detect GPSes with
const uint32_t AP_GPS::_baudrates[] PROGMEM = {4800U, 38400U, 115200U, 57600U, 9600U};
// initialisation blobs to send to the GPS to try to get it into the
// right mode
const prog_char AP_GPS::_initialisation_blob[] PROGMEM = UBLOX_SET_BINARY MTK_SET_BINARY SIRF_SET_BINARY;
/*
send some more initialisation string bytes if there is room in the
UART transmit buffer
*/
void AP_GPS::send_blob_start(uint8_t instance, const prog_char *_blob, uint16_t size)
{
initblob_state[instance].blob = _blob;
initblob_state[instance].remaining = size;
}
/*
send some more initialisation string bytes if there is room in the
UART transmit buffer
*/
void AP_GPS::send_blob_update(uint8_t instance)
{
// exit immediately if no uart for this instance
if (_port[instance] == NULL) {
return;
}
// see if we can write some more of the initialisation blob
if (initblob_state[instance].remaining > 0) {
int16_t space = _port[instance]->txspace();
if (space > (int16_t)initblob_state[instance].remaining) {
space = initblob_state[instance].remaining;
}
while (space > 0) {
_port[instance]->write(pgm_read_byte(initblob_state[instance].blob));
initblob_state[instance].blob++;
space--;
initblob_state[instance].remaining--;
}
}
}
/*
run detection step for one GPS instance. If this finds a GPS then it
will fill in drivers[instance] and change state[instance].status
from NO_GPS to NO_FIX.
*/
void
AP_GPS::detect_instance(uint8_t instance)
{
AP_GPS_Backend *new_gps = NULL;
struct detect_state *dstate = &detect_state[instance];
uint32_t now = hal.scheduler->millis();
#if CONFIG_HAL_BOARD == HAL_BOARD_PX4
if (_type[instance] == GPS_TYPE_PX4) {
// check for explicitely chosen PX4 GPS beforehand
// it is not possible to autodetect it, nor does it require a real UART
hal.console->print_P(PSTR(" PX4 "));
new_gps = new AP_GPS_PX4(*this, state[instance], _port[instance]);
goto found_gps;
}
#endif
if (_port[instance] == NULL) {
// UART not available
return;
}
state[instance].instance = instance;
state[instance].status = NO_GPS;
// record the time when we started detection. This is used to try
// to avoid initialising a uBlox as a NMEA GPS
if (dstate->detect_started_ms == 0) {
dstate->detect_started_ms = now;
}
if (now - dstate->last_baud_change_ms > 1200) {
// try the next baud rate
dstate->last_baud++;
if (dstate->last_baud == sizeof(_baudrates) / sizeof(_baudrates[0])) {
dstate->last_baud = 0;
}
uint32_t baudrate = pgm_read_dword(&_baudrates[dstate->last_baud]);
_port[instance]->begin(baudrate);
_port[instance]->set_flow_control(AP_HAL::UARTDriver::FLOW_CONTROL_DISABLE);
dstate->last_baud_change_ms = now;
send_blob_start(instance, _initialisation_blob, sizeof(_initialisation_blob));
}
send_blob_update(instance);
while (_port[instance]->available() > 0 && new_gps == NULL) {
uint8_t data = _port[instance]->read();
/*
running a uBlox at less than 38400 will lead to packet
corruption, as we can't receive the packets in the 200ms
window for 5Hz fixes. The NMEA startup message should force
the uBlox into 38400 no matter what rate it is configured
for.
*/
if ((_type[instance] == GPS_TYPE_AUTO || _type[instance] == GPS_TYPE_UBLOX) &&
pgm_read_dword(&_baudrates[dstate->last_baud]) >= 38400 &&
AP_GPS_UBLOX::_detect(dstate->ublox_detect_state, data)) {
hal.console->print_P(PSTR(" ublox "));
new_gps = new AP_GPS_UBLOX(*this, state[instance], _port[instance]);
}
else if ((_type[instance] == GPS_TYPE_AUTO || _type[instance] == GPS_TYPE_MTK19) &&
AP_GPS_MTK19::_detect(dstate->mtk19_detect_state, data)) {
hal.console->print_P(PSTR(" MTK19 "));
new_gps = new AP_GPS_MTK19(*this, state[instance], _port[instance]);
}
else if ((_type[instance] == GPS_TYPE_AUTO || _type[instance] == GPS_TYPE_MTK) &&
AP_GPS_MTK::_detect(dstate->mtk_detect_state, data)) {
hal.console->print_P(PSTR(" MTK "));
new_gps = new AP_GPS_MTK(*this, state[instance], _port[instance]);
}
#if GPS_RTK_AVAILABLE
else if ((_type[instance] == GPS_TYPE_AUTO || _type[instance] == GPS_TYPE_SBP) &&
AP_GPS_SBP::_detect(dstate->sbp_detect_state, data)) {
hal.console->print_P(PSTR(" SBP "));
new_gps = new AP_GPS_SBP(*this, state[instance], _port[instance]);
}
#endif // HAL_CPU_CLASS
#if !defined(GPS_SKIP_SIRF_NMEA)
// save a bit of code space on a 1280
else if ((_type[instance] == GPS_TYPE_AUTO || _type[instance] == GPS_TYPE_SIRF) &&
AP_GPS_SIRF::_detect(dstate->sirf_detect_state, data)) {
hal.console->print_P(PSTR(" SIRF "));
new_gps = new AP_GPS_SIRF(*this, state[instance], _port[instance]);
}
else if (now - dstate->detect_started_ms > 5000) {
// prevent false detection of NMEA mode in
// a MTK or UBLOX which has booted in NMEA mode
if ((_type[instance] == GPS_TYPE_AUTO || _type[instance] == GPS_TYPE_NMEA) &&
AP_GPS_NMEA::_detect(dstate->nmea_detect_state, data)) {
hal.console->print_P(PSTR(" NMEA "));
new_gps = new AP_GPS_NMEA(*this, state[instance], _port[instance]);
}
}
#endif
}
found_gps:
if (new_gps != NULL) {
state[instance].status = NO_FIX;
drivers[instance] = new_gps;
timing[instance].last_message_time_ms = now;
}
}
bool
AP_GPS::can_calculate_base_pos(void)
{
#if GPS_RTK_AVAILABLE
for (uint8_t i=0; i<GPS_MAX_INSTANCES; i++) {
if (drivers[i] != NULL && drivers[i]->can_calculate_base_pos()) {
return true;
}
}
#endif
return false;
}
/*
Tells the underlying GPS drivers to capture its current position as home.
*/
void
AP_GPS::calculate_base_pos(void)
{
#if GPS_RTK_AVAILABLE
for (uint8_t i = 0; i<GPS_MAX_INSTANCES; i++) {
if (drivers[i] != NULL && drivers[i]->can_calculate_base_pos()) {
drivers[i]->calculate_base_pos();
}
}
#endif
}
AP_GPS::GPS_Status
AP_GPS::highest_supported_status(uint8_t instance) const
{
#if GPS_RTK_AVAILABLE
if (drivers[instance] != NULL)
return drivers[instance]->highest_supported_status();
#endif
return AP_GPS::GPS_OK_FIX_3D;
}
AP_GPS::GPS_Status
AP_GPS::highest_supported_status(void) const
{
#if GPS_RTK_AVAILABLE
if (drivers[primary_instance] != NULL)
return drivers[primary_instance]->highest_supported_status();
#endif
return AP_GPS::GPS_OK_FIX_3D;
}
/*
update one GPS instance. This should be called at 10Hz or greater
*/
void
AP_GPS::update_instance(uint8_t instance)
{
if (_type[instance] == GPS_TYPE_HIL) {
// in HIL, leave info alone
return;
}
if (_type[instance] == GPS_TYPE_NONE) {
// not enabled
state[instance].status = NO_GPS;
return;
}
if (locked_ports & (1U<<instance)) {
// the port is locked by another driver
return;
}
if (drivers[instance] == NULL || state[instance].status == NO_GPS) {
// we don't yet know the GPS type of this one, or it has timed
// out and needs to be re-initialised
detect_instance(instance);
return;
}
send_blob_update(instance);
// we have an active driver for this instance
bool result = drivers[instance]->read();
uint32_t tnow = hal.scheduler->millis();
// if we did not get a message, and the idle timer of 1.2 seconds
// has expired, re-initialise the GPS. This will cause GPS
// detection to run again
if (!result) {
if (tnow - timing[instance].last_message_time_ms > 1200) {
// free the driver before we run the next detection, so we
// don't end up with two allocated at any time
delete drivers[instance];
drivers[instance] = NULL;
memset(&state[instance], 0, sizeof(state[instance]));
state[instance].instance = instance;
state[instance].status = NO_GPS;
timing[instance].last_message_time_ms = tnow;
}
} else {
timing[instance].last_message_time_ms = tnow;
if (state[instance].status >= GPS_OK_FIX_2D) {
timing[instance].last_fix_time_ms = tnow;
}
}
}
/*
update all GPS instances
*/
void
AP_GPS::update(void)
{
for (uint8_t i=0; i<GPS_MAX_INSTANCES; i++) {
update_instance(i);
}
#if GPS_MAX_INSTANCES > 1
// work out which GPS is the primary, and how many sensors we have
for (uint8_t i=0; i<GPS_MAX_INSTANCES; i++) {
if (state[i].status != NO_GPS) {
num_instances = i+1;
}
if (_auto_switch) {
if (i == primary_instance) {
continue;
}
if (state[i].status > state[primary_instance].status) {
// we have a higher status lock, change GPS
primary_instance = i;
continue;
}
if (state[i].status == state[primary_instance].status &&
state[i].num_sats >= state[primary_instance].num_sats + 2) {
// this GPS has at least 2 more satellites than the
// current primary, switch primary. Once we switch we will
// then tend to stick to the new GPS as primary. We don't
// want to switch too often as it will look like a
// position shift to the controllers.
primary_instance = i;
}
} else {
primary_instance = 0;
}
}
#else
num_instances = 1;
#endif // GPS_MAX_INSTANCES
// update notify with gps status. We always base this on the primary_instance
AP_Notify::flags.gps_status = state[primary_instance].status;
}
/*
set HIL (hardware in the loop) status for a GPS instance
*/
void
AP_GPS::setHIL(uint8_t instance, GPS_Status _status, uint64_t time_epoch_ms,
const Location &_location, const Vector3f &_velocity, uint8_t _num_sats,
uint16_t hdop, bool _have_vertical_velocity)
{
if (instance >= GPS_MAX_INSTANCES) {
return;
}
uint32_t tnow = hal.scheduler->millis();
GPS_State &istate = state[instance];
istate.status = _status;
istate.location = _location;
istate.location.options = 0;
istate.velocity = _velocity;
istate.have_vertical_velocity = true;
istate.ground_speed = pythagorous2(istate.velocity.x, istate.velocity.y);
istate.ground_course_cd = degrees(atan2f(istate.velocity.y, istate.velocity.x)) * 100UL;
istate.hdop = hdop;
istate.num_sats = _num_sats;
istate.have_vertical_velocity = _have_vertical_velocity;
istate.last_gps_time_ms = tnow;
uint64_t gps_time_ms = time_epoch_ms - (17000ULL*86400ULL + 52*10*7000ULL*86400ULL - 15000ULL);
istate.time_week = gps_time_ms / (86400*7*(uint64_t)1000);
istate.time_week_ms = gps_time_ms - istate.time_week*(86400*7*(uint64_t)1000);
timing[instance].last_message_time_ms = tnow;
timing[instance].last_fix_time_ms = tnow;
_type[instance].set(GPS_TYPE_HIL);
}
/**
Lock a GPS port, prevening the GPS driver from using it. This can
be used to allow a user to control a GPS port via the
SERIAL_CONTROL protocol
*/
void
AP_GPS::lock_port(uint8_t instance, bool lock)
{
if (instance >= GPS_MAX_INSTANCES) {
return;
}
if (lock) {
locked_ports |= (1U<<instance);
} else {
locked_ports &= ~(1U<<instance);
}
}
void
AP_GPS::send_mavlink_gps_raw(mavlink_channel_t chan)
{
static uint32_t last_send_time_ms;
if (status(0) > AP_GPS::NO_GPS) {
// when we have a GPS then only send new data
if (last_send_time_ms == last_message_time_ms(0)) {
return;
}
last_send_time_ms = last_message_time_ms(0);
} else {
// when we don't have a GPS then send at 1Hz
uint32_t now = hal.scheduler->millis();
if (now - last_send_time_ms < 1000) {
return;
}
last_send_time_ms = now;
}
const Location &loc = location(0);
mavlink_msg_gps_raw_int_send(
chan,
last_fix_time_ms(0)*(uint64_t)1000,
status(0),
loc.lat, // in 1E7 degrees
loc.lng, // in 1E7 degrees
loc.alt * 10UL, // in mm
get_hdop(0),
65535,
ground_speed(0)*100, // cm/s
ground_course_cd(0), // 1/100 degrees,
num_sats(0));
}
#if GPS_MAX_INSTANCES > 1
void
AP_GPS::send_mavlink_gps2_raw(mavlink_channel_t chan)
{
static uint32_t last_send_time_ms;
if (num_sensors() < 2 || status(1) <= AP_GPS::NO_GPS) {
return;
}
// when we have a GPS then only send new data
if (last_send_time_ms == last_message_time_ms(1)) {
return;
}
last_send_time_ms = last_message_time_ms(1);
const Location &loc = location(1);
mavlink_msg_gps2_raw_send(
chan,
last_fix_time_ms(1)*(uint64_t)1000,
status(1),
loc.lat,
loc.lng,
loc.alt * 10UL,
get_hdop(1),
65535,
ground_speed(1)*100, // cm/s
ground_course_cd(1), // 1/100 degrees,
num_sats(1),
0,
0);
}
#endif
#if GPS_RTK_AVAILABLE
void
AP_GPS::send_mavlink_gps_rtk(mavlink_channel_t chan)
{
if (drivers[0] != NULL && drivers[0]->highest_supported_status() > AP_GPS::GPS_OK_FIX_3D) {
drivers[0]->send_mavlink_gps_rtk(chan);
}
}
#if GPS_MAX_INSTANCES > 1
void
AP_GPS::send_mavlink_gps2_rtk(mavlink_channel_t chan)
{
if (drivers[1] != NULL && drivers[1]->highest_supported_status() > AP_GPS::GPS_OK_FIX_3D) {
drivers[1]->send_mavlink_gps_rtk(chan);
}
}
#endif
#endif
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