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55 lines
1.8 KiB
55 lines
1.8 KiB
11 years ago
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// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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GPS driver backend class
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*/
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#ifndef __AP_GPS_BACKEND_H__
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#define __AP_GPS_BACKEND_H__
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class AP_GPS_Backend
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{
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public:
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AP_GPS_Backend(AP_GPS &_gps, AP_GPS::GPS_State &_state, AP_HAL::UARTDriver *_port);
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// The read() method is the only one needed in each driver. It
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// should return true when the backend has successfully received a
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// valid packet from the GPS.
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virtual bool read() = 0;
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protected:
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AP_HAL::UARTDriver *port; ///< UART we are attached to
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AP_GPS &gps; ///< access to frontend (for parameters)
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AP_GPS::GPS_State &state; ///< public state for this instance
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// common utility functions
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int32_t swap_int32(int32_t v) const;
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int16_t swap_int16(int16_t v) const;
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/*
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fill in 3D velocity from 2D components
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*/
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void fill_3d_velocity(void);
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/*
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fill in time_week_ms and time_week from BCD date and time components
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assumes MTK19 millisecond form of bcd_time
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*/
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void make_gps_time(uint32_t bcd_date, uint32_t bcd_milliseconds);
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};
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#endif // __AP_GPS_BACKEND_H__
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