ardupilot/libraries/AP_Airspeed/AP_Airspeed_Backend.h

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/*
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/>.
*/
#pragma once
/*
backend driver class for airspeed
*/
#include <AP_Common/AP_Common.h>
#include <AP_HAL/AP_HAL.h>
#include "AP_Airspeed.h"
class AP_Airspeed_Backend {
public:
AP_Airspeed_Backend(AP_Airspeed &frontend, uint8_t instance);
virtual ~AP_Airspeed_Backend();
// probe and initialise the sensor
virtual bool init(void) = 0;
// return the current differential_pressure in Pascal
virtual bool get_differential_pressure(float &pressure) = 0;
// return the current temperature in degrees C, if available
virtual bool get_temperature(float &temperature) = 0;
protected:
int8_t get_pin(void) const;
float get_psi_range(void) const;
uint8_t get_bus(void) const;
AP_Airspeed::pitot_tube_order get_tube_order(void) const {
return AP_Airspeed::pitot_tube_order(frontend.param[instance].tube_order.get());
}
// semaphore for access to shared frontend data
HAL_Semaphore sem;
float get_airspeed_ratio(void) const {
return frontend.get_airspeed_ratio(instance);
}
// some sensors use zero offsets
void set_use_zero_offset(void) {
frontend.state[instance].use_zero_offset = true;
}
// set to no zero cal, which makes sense for some sensors
void set_skip_cal(void) {
frontend.param[instance].skip_cal.set(1);
}
// set zero offset
void set_offset(float ofs) {
frontend.param[instance].offset.set(ofs);
}
private:
AP_Airspeed &frontend;
uint8_t instance;
};