ardupilot/libraries/AP_GPS/AP_GPS_SIRF.h

97 lines
2.6 KiB
C++

// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: t -*-
//
// SiRF Binary GPS driver for ArduPilot and ArduPilotMega.
// Code by Michael Smith.
//
// This library is free software; you can redistribute it and / or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
#ifndef __AP_GPS_SIRF_H__
#define __AP_GPS_SIRF_H__
#include <AP_HAL.h>
#include "GPS.h"
#define SIRF_SET_BINARY "$PSRF100,0,38400,8,1,0*3C"
class AP_GPS_SIRF : public GPS {
public:
virtual void init(AP_HAL::UARTDriver *s, enum GPS_Engine_Setting nav_setting = GPS_ENGINE_NONE);
virtual bool read();
static bool _detect(uint8_t data);
private:
// XXX this is being ignored by the compiler #pragma pack(1)
struct sirf_geonav {
uint16_t fix_invalid;
uint16_t fix_type;
uint16_t week;
uint32_t time;
uint16_t year;
uint8_t month;
uint8_t day;
uint8_t hour;
uint8_t minute;
uint16_t second;
uint32_t satellites_used;
int32_t latitude;
int32_t longitude;
int32_t altitude_ellipsoid;
int32_t altitude_msl;
int8_t map_datum;
int16_t ground_speed;
int16_t ground_course;
int16_t res1;
int16_t climb_rate;
uint16_t heading_rate;
uint32_t horizontal_position_error;
uint32_t vertical_position_error;
uint32_t time_error;
int16_t horizontal_velocity_error;
int32_t clock_bias;
uint32_t clock_bias_error;
int32_t clock_drift;
uint32_t clock_drift_error;
uint32_t distance;
uint16_t distance_error;
uint16_t heading_error;
uint8_t satellites;
uint8_t hdop;
uint8_t mode_info;
};
// #pragma pack(pop)
enum sirf_protocol_bytes {
PREAMBLE1 = 0xa0,
PREAMBLE2 = 0xa2,
POSTAMBLE1 = 0xb0,
POSTAMBLE2 = 0xb3,
MSG_GEONAV = 0x29
};
enum sirf_fix_type {
FIX_3D = 0x6,
FIX_MASK = 0x7
};
// State machine state
uint8_t _step;
uint16_t _checksum;
bool _gather;
uint16_t _payload_length;
uint16_t _payload_counter;
uint8_t _msg_id;
// Message buffer
union {
sirf_geonav nav;
uint8_t bytes[];
} _buffer;
bool _parse_gps(void);
void _accumulate(uint8_t val);
};
#endif // AP_GPS_SIRF_h