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51 lines
1.4 KiB
51 lines
1.4 KiB
/* |
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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/AP_HAL.h> |
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#include <AP_Common/AP_Common.h> |
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#include "AP_Airspeed.h" |
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#include "AP_Airspeed_analog.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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AP_Airspeed_Analog::AP_Airspeed_Analog(AP_Airspeed &_frontend, uint8_t _instance) : |
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AP_Airspeed_Backend(_frontend, _instance) |
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{ |
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_source = hal.analogin->channel(get_pin()); |
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} |
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bool AP_Airspeed_Analog::init() |
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{ |
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return _source != nullptr; |
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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 == nullptr) { |
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return false; |
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} |
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// allow pin to change |
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_source->set_pin(get_pin()); |
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pressure = _source->voltage_average_ratiometric() * VOLTS_TO_PASCAL / get_psi_range(); |
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return true; |
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}
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