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ardupilot/libraries/AP_GPS/AP_GPS_SBP.h

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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/>.
*/
//
// Swift Navigation SBP GPS driver for ArduPilot.
// Code by Niels Joubert
//
// Swift Binary Protocol format: http://docs.swift-nav.com/libswiftnav
#ifndef __AP_GPS_SBP_H__
#define __AP_GPS_SBP_H__
#include <AP_GPS.h>
//OVERALL DESIGN NOTES.
// Niels Joubert, April 2014
//
//
// REQUIREMENTS:
// 1) We need to update the entire state structure "atomically",
// which is indicated by returning "true" from read().
//
// - We use sticky bits to track when each part is updated
// and return true when all the sticky bits are set
//
// 2) We want to minimize memory usage in the detection routine
//
// - We use a stripped-down version of the sbp_parser_state_t struct
// that does not bother to decode the message, it just tracks the CRC.
//
class AP_GPS_SBP : public AP_GPS_Backend
{
public:
AP_GPS_SBP(AP_GPS &_gps, AP_GPS::GPS_State &_state, AP_HAL::UARTDriver *_port);
// Methods
bool read();
static bool _detect(struct SBP_detect_state &state, uint8_t data);
private:
// ************************************************************************
// Swift Navigation SBP protocol types and definitions
// ************************************************************************
struct sbp_parser_state_t {
enum {
WAITING = 0,
GET_TYPE = 1,
GET_SENDER = 2,
GET_LEN = 3,
GET_MSG = 4,
GET_CRC = 5
} state:8;
uint16_t msg_type;
uint16_t sender_id;
uint16_t crc;
uint8_t msg_len;
uint8_t n_read;
uint8_t msg_buff[256];
} parser_state;
static const uint8_t SBP_PREAMBLE = 0x55;
//Message types supported by this driver
static const uint16_t SBP_GPS_TIME_MSGTYPE = 0x0100;
static const uint16_t SBP_DOPS_MSGTYPE = 0x0206;
static const uint16_t SBP_POS_ECEF_MSGTYPE = 0x0200;
static const uint16_t SBP_POS_LLH_MSGTYPE = 0x0201;
static const uint16_t SBP_BASELINE_ECEF_MSGTYPE = 0x0202;
static const uint16_t SBP_BASELINE_NED_MSGTYPE = 0x0203;
static const uint16_t SBP_VEL_ECEF_MSGTYPE = 0x0204;
static const uint16_t SBP_VEL_NED_MSGTYPE = 0x0205;
// GPS Time
struct PACKED sbp_gps_time_t {
uint16_t wn; //< GPS week number (unit: weeks)
uint32_t tow; //< GPS Time of Week rounded to the nearest ms (unit: ms)
int32_t ns; //< Nanosecond remainder of rounded tow (unit: ns)
uint8_t flags; //< Status flags (reserved)
};
// Dilution of Precision
struct PACKED sbp_dops_t {
uint32_t tow; //< GPS Time of Week (unit: ms)
uint16_t gdop; //< Geometric Dilution of Precision (unit: 0.01)
uint16_t pdop; //< Position Dilution of Precision (unit: 0.01)
uint16_t tdop; //< Time Dilution of Precision (unit: 0.01)
uint16_t hdop; //< Horizontal Dilution of Precision (unit: 0.01)
uint16_t vdop; //< Vertical Dilution of Precision (unit: 0.01)
};
// Position solution in absolute Earth Centered Earth Fixed (ECEF) coordinates.
struct PACKED sbp_pos_ecef_t {
uint32_t tow; //< GPS Time of Week (unit: ms)
double x; //< ECEF X coordinate (unit: meters)
double y; //< ECEF Y coordinate (unit: meters)
double z; //< ECEF Z coordinate (unit: meters)
uint16_t accuracy; //< Position accuracy estimate (unit: mm)
uint8_t n_sats; //< Number of satellites used in solution
uint8_t flags; //< Status flags
};
// Geodetic position solution.
struct PACKED sbp_pos_llh_t {
uint32_t tow; //< GPS Time of Week (unit: ms)
double lat; //< Latitude (unit: degrees)
double lon; //< Longitude (unit: degrees)
double height; //< Height (unit: meters)
uint16_t h_accuracy; //< Horizontal position accuracy estimate (unit: mm)
uint16_t v_accuracy; //< Vertical position accuracy estimate (unit: mm)
uint8_t n_sats; //< Number of satellites used in solution
uint8_t flags; //< Status flags
};
// Baseline in Earth Centered Earth Fixed (ECEF) coordinates.
struct PACKED sbp_baseline_ecef_t {
uint32_t tow; //< GPS Time of Week (unit: ms)
int32_t x; //< Baseline ECEF X coordinate (unit: mm)
int32_t y; //< Baseline ECEF Y coordinate (unit: mm)
int32_t z; //< Baseline ECEF Z coordinate (unit: mm)
uint16_t accuracy; //< Position accuracy estimate (unit: mm)
uint8_t n_sats; //< Number of satellites used in solution
uint8_t flags; //< Status flags (reserved)
};
// Baseline in local North East Down (NED) coordinates.
struct PACKED sbp_baseline_ned_t {
uint32_t tow; //< GPS Time of Week (unit: ms)
int32_t n; //< Baseline North coordinate (unit: mm)
int32_t e; //< Baseline East coordinate (unit: mm)
int32_t d; //< Baseline Down coordinate (unit: mm)
uint16_t h_accuracy; //< Horizontal position accuracy estimate (unit: mm)
uint16_t v_accuracy; //< Vertical position accuracy estimate (unit: mm)
uint8_t n_sats; //< Number of satellites used in solution
uint8_t flags; //< Status flags (reserved)
};
//Velocity in Earth Centered Earth Fixed (ECEF) coordinates.
struct PACKED sbp_vel_ecef_t {
uint32_t tow; //< GPS Time of Week (unit: ms)
int32_t x; //< Velocity ECEF X coordinate (unit: mm/s)
int32_t y; //< Velocity ECEF Y coordinate (unit: mm/s)
int32_t z; //< Velocity ECEF Z coordinate (unit: mm/s)
uint16_t accuracy; //< Velocity accuracy estimate (unit: mm/s)
uint8_t n_sats; //< Number of satellites used in solution
uint8_t flags; //< Status flags (reserved)
};
// Velocity in NED Velocity in local North East Down (NED) coordinates.
struct PACKED sbp_vel_ned_t {
uint32_t tow; //< GPS Time of Week (unit: ms)
int32_t n; //< Velocity North coordinate (unit: mm/s)
int32_t e; //< Velocity East coordinate (unit: mm/s)
int32_t d; //< Velocity Down coordinate (unit: mm/s)
uint16_t h_accuracy; //< Horizontal velocity accuracy estimate (unit: mm/s)
uint16_t v_accuracy; //< Vertical velocity accuracy estimate (unit: mm/s)
uint8_t n_sats; //< Number of satellites used in solution
uint8_t flags; //< Status flags (reserved)
};
// ************************************************************************
// Swift Navigation SBP protocol parsing and processing
// ************************************************************************
//Pulls data from the port, dispatches messages to processing functions
void sbp_process();
//Processes individual messages
//When a message is received, it sets a sticky bit that it has updated
//itself. This is used to track when a full update of GPS_State has occurred
void sbp_process_gpstime(uint8_t* msg);
void sbp_process_dops(uint8_t* msg);
void sbp_process_pos_ecef(uint8_t* msg);
void sbp_process_pos_llh(uint8_t* msg);
void sbp_process_baseline_ecef(uint8_t* msg);
void sbp_process_baseline_ned(uint8_t* msg);
void sbp_process_vel_ecef(uint8_t* msg);
void sbp_process_vel_ned(uint8_t* msg);
//Sticky bits to track updating of state
bool has_updated_pos:1;
bool has_updated_vel:1;
// ************************************************************************
// Monitoring and Performance Counting
// ************************************************************************
uint8_t pos_msg_counter;
uint8_t vel_msg_counter;
uint8_t dops_msg_counter;
uint8_t baseline_msg_counter;
uint16_t crc_error_counter;
uint32_t last_healthcheck_millis;
// ************************************************************************
// Logging to DataFlash
// ************************************************************************
// have we written the logging headers to DataFlash?
static bool logging_started;
void logging_write_headers();
void logging_log_health(float pos_msg_hz, float vel_msg_hz, float dops_msg_hz, float baseline_msg_hz, float crc_error_hz);
void logging_log_baseline(struct sbp_baseline_ecef_t*);
};
#endif // __AP_GPS_SBP_H__
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