mirror of https://github.com/ArduPilot/ardupilot
94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
// -*- 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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#include "AP_RangeFinder_LightWareI2C.h"
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#include <utility>
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#include <AP_HAL/AP_HAL.h>
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#include <AP_HAL/utility/sparse-endian.h>
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extern const AP_HAL::HAL& hal;
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/*
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The constructor also initializes the rangefinder. Note that this
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constructor is not called until detect() returns true, so we
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already know that we should setup the rangefinder
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*/
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AP_RangeFinder_LightWareI2C::AP_RangeFinder_LightWareI2C(RangeFinder &_ranger, uint8_t instance, RangeFinder::RangeFinder_State &_state, AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev)
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: AP_RangeFinder_Backend(_ranger, instance, _state)
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, _dev(std::move(dev))
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{
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}
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/*
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detect if a Lightware rangefinder is connected. We'll detect by
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trying to take a reading on I2C. If we get a result the sensor is
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there.
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*/
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AP_RangeFinder_Backend *AP_RangeFinder_LightWareI2C::detect(RangeFinder &_ranger, uint8_t instance, RangeFinder::RangeFinder_State &_state, AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev)
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{
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AP_RangeFinder_LightWareI2C *sensor
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= new AP_RangeFinder_LightWareI2C(_ranger, instance, _state, std::move(dev));
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uint16_t reading_cm;
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if (!sensor || !sensor->get_reading(reading_cm)) {
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delete sensor;
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return nullptr;
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}
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return sensor;
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}
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// read - return last value measured by sensor
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bool AP_RangeFinder_LightWareI2C::get_reading(uint16_t &reading_cm)
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{
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be16_t val;
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if (ranger._address[state.instance] == 0) {
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return false;
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}
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// exit immediately if we can't take the semaphore
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if (!_dev || _dev->get_semaphore()->take(1)) {
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return false;
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}
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// read the high and low byte distance registers
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bool ret = _dev->read((uint8_t *) &val, sizeof(val));
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if (ret) {
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// combine results into distance
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reading_cm = be16toh(val);
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}
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_dev->get_semaphore()->give();
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return ret;
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}
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/*
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update the state of the sensor
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*/
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void AP_RangeFinder_LightWareI2C::update(void)
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{
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if (get_reading(state.distance_cm)) {
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// update range_valid state based on distance measured
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update_status();
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} else {
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set_status(RangeFinder::RangeFinder_NoData);
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}
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}
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