ardupilot/libraries/AP_GPS/GPS_detect_state.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/>.
*/
/*
GPS detection state structures. These need to be in a separate
header to prevent a circular dependency between AP_GPS and the
backend drivers.
These structures are allocated as a single block in AP_GPS during
driver detection, then freed once the detection is finished. Each
GPS driver needs to implement a static _detect() function which uses
this state information to detect if the attached GPS is of the
specific type that it handles.
*/
struct MTK19_detect_state {
uint8_t payload_counter;
uint8_t step;
uint8_t ck_a, ck_b;
};
struct MTK_detect_state {
uint8_t payload_counter;
uint8_t step;
uint8_t ck_a, ck_b;
};
struct NMEA_detect_state {
uint8_t step;
uint8_t ck;
};
struct SIRF_detect_state {
uint16_t checksum;
uint8_t step, payload_length, payload_counter;
};
struct UBLOX_detect_state {
uint8_t payload_length, payload_counter;
uint8_t step;
uint8_t ck_a, ck_b;
};
struct SBP_detect_state {
enum {
WAITING = 0,
GET_TYPE = 1,
GET_SENDER = 2,
GET_LEN = 3,
GET_MSG = 4,
GET_CRC = 5
} state:8;
uint8_t n_read;
uint8_t msg_len;
uint16_t crc_so_far;
uint16_t crc;
};