mirror of https://github.com/ArduPilot/ardupilot
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
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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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* analog airspeed driver
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*/
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#include <AP_HAL.h>
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#include <AP_Math.h>
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#include <AP_Common.h>
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#include <AP_ADC.h>
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#include <AP_ADC_AnalogSource.h>
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#include <AP_Airspeed.h>
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extern const AP_HAL::HAL& hal;
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// scaling for 3DR analog airspeed sensor
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#define VOLTS_TO_PASCAL 819
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#if CONFIG_HAL_BOARD == HAL_BOARD_APM1
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extern AP_ADC_ADS7844 apm1_adc;
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#endif
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bool AP_Airspeed_Analog::init()
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{
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#if CONFIG_HAL_BOARD == HAL_BOARD_APM1
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if (_pin == 64) {
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_source = new AP_ADC_AnalogSource( &apm1_adc, 7, 1.0f);
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return true;
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}
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#endif
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_source = hal.analogin->channel(_pin);
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return true;
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}
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// read the airspeed sensor
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bool AP_Airspeed_Analog::get_differential_pressure(float &pressure)
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{
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if (_source == NULL) {
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return false;
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}
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_source->set_pin(_pin);
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pressure = _source->voltage_average_ratiometric() * VOLTS_TO_PASCAL;
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return true;
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}
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