mirror of https://github.com/ArduPilot/ardupilot
132 lines
3.0 KiB
C++
132 lines
3.0 KiB
C++
// Trimble GSOF protocol parser library.
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#pragma once
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#include "AP_GSOF_config.h"
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#if AP_GSOF_ENABLED
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class AP_GSOF
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{
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public:
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static constexpr int NO_GSOF_DATA = 0;
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static constexpr int UNEXPECTED_NUM_GSOF_PACKETS = -1;
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// Parse a single byte into the buffer.
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// When enough data has arrived, it returns the number of GSOF packets parsed in the GENOUT packet.
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// If an unexpected number of GSOF packets were parsed, returns UNEXPECTED_NUM_GSOF_PACKETS.
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// This means there is no fix.
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// If it returns NO_GSOF_DATA, the parser just needs more data.
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int parse(const uint8_t temp, const uint8_t n_expected) WARN_IF_UNUSED;
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// GSOF packet numbers.
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enum msg_idx_t {
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POS_TIME = 1,
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POS = 2,
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VEL = 8,
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DOP = 9,
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POS_SIGMA = 12
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};
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// GSOF1
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struct PACKED pos_time_t {
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uint32_t time_week_ms;
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uint16_t time_week;
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uint16_t num_sats;
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uint8_t pos_flags1;
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uint8_t pos_flags2;
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uint8_t initialized_number;
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};
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pos_time_t pos_time;
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// GSOF2
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struct PACKED pos_t {
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// [rad]
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double latitude_rad;
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// [rad]
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double longitude_rad;
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// [m]
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double altitude;
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};
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pos_t position;
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// GSOF8
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struct PACKED vel_t {
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uint8_t velocity_flags;
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float horizontal_velocity;
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// True north, WGS-84 [rad]. Actually ground course, just mislabeled in the docs.
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float heading;
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// Stored in the direction from GSOF (up = positive).
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float vertical_velocity;
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// These bytes are included only if a local coordinate system is loaded.
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float local_heading;
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};
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vel_t vel;
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// GSOF9
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struct PACKED dop_t {
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float pdop;
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float hdop;
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float vdop;
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float tdop;
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};
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dop_t dop;
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// GSOF12
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struct PACKED pos_sigma_t {
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float pos_rms;
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float sigma_east;
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float sigma_north;
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float cov_east_north;
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float sigma_up;
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float semi_major_axis;
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float semi_minor_axis;
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float orientation;
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float unit_variance;
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uint16_t num_epochs;
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};
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pos_sigma_t pos_sigma;
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private:
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// Parses current data and returns the number of parsed GSOF messages.
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int process_message() WARN_IF_UNUSED;
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void parse_pos_time(uint32_t a);
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void parse_pos(uint32_t a);
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void parse_vel(uint32_t a);
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void parse_dop(uint32_t a);
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void parse_pos_sigma(uint32_t a);
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struct Msg_Parser {
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enum class State {
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STARTTX = 0,
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STATUS,
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PACKETTYPE,
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LENGTH,
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DATA,
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CHECKSUM,
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ENDTX
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};
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State state {State::STARTTX};
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uint8_t status;
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uint8_t packettype;
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uint8_t length;
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uint8_t data[256];
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uint8_t checksum;
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uint8_t endtx;
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uint8_t read;
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uint8_t checksumcalc;
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} msg;
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static const uint8_t STX = 0x02;
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static const uint8_t ETX = 0x03;
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};
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#endif // AP_GSOF_ENABLED
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