mirror of https://github.com/ArduPilot/ardupilot
364 lines
17 KiB
C++
364 lines
17 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 "RangeFinder.h"
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#include "AP_RangeFinder_analog.h"
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#include "AP_RangeFinder_PulsedLightLRF.h"
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#include "AP_RangeFinder_MaxsonarI2CXL.h"
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#include "AP_RangeFinder_PX4.h"
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#include "AP_RangeFinder_PX4_PWM.h"
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// table of user settable parameters
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const AP_Param::GroupInfo RangeFinder::var_info[] PROGMEM = {
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// @Param: _TYPE
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// @DisplayName: Rangefinder type
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// @Description: What type of rangefinder device that is connected
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// @Values: 0:None,1:Analog,2:APM2-MaxbotixI2C,3:APM2-PulsedLightI2C,4:PX4-I2C,5:PX4-PWM
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AP_GROUPINFO("_TYPE", 0, RangeFinder, _type[0], 0),
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// @Param: _PIN
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// @DisplayName: Rangefinder pin
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// @Description: Analog pin that rangefinder is connected to. Set this to 0..9 for the APM2 analog pins. Set to 64 on an APM1 for the dedicated 'airspeed' port on the end of the board. Set to 11 on PX4 for the analog 'airspeed' port. Set to 15 on the Pixhawk for the analog 'airspeed' port.
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// @Values: -1:Not Used, 0:APM2-A0, 1:APM2-A1, 2:APM2-A2, 3:APM2-A3, 4:APM2-A4, 5:APM2-A5, 6:APM2-A6, 7:APM2-A7, 8:APM2-A8, 9:APM2-A9, 11:PX4-airspeed port, 15:Pixhawk-airspeed port, 64:APM1-airspeed port
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AP_GROUPINFO("_PIN", 1, RangeFinder, _pin[0], -1),
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// @Param: _SCALING
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// @DisplayName: Rangefinder scaling
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// @Description: Scaling factor between rangefinder reading and distance. For the linear and inverted functions this is in meters per volt. For the hyperbolic function the units are meterVolts.
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// @Units: meters/Volt
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// @Increment: 0.001
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AP_GROUPINFO("_SCALING", 2, RangeFinder, _scaling[0], 3.0f),
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// @Param: _OFFSET
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// @DisplayName: rangefinder offset
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// @Description: Offset in volts for zero distance for analog rangefinders. Offset added to distance in centimeters for PWM and I2C Lidars
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// @Units: Volts
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// @Increment: 0.001
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AP_GROUPINFO("_OFFSET", 3, RangeFinder, _offset[0], 0.0f),
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// @Param: _FUNCTION
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// @DisplayName: Rangefinder function
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// @Description: Control over what function is used to calculate distance. For a linear function, the distance is (voltage-offset)*scaling. For a inverted function the distance is (offset-voltage)*scaling. For a hyperbolic function the distance is scaling/(voltage-offset). The functions return the distance in meters.
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// @Values: 0:Linear,1:Inverted,2:Hyperbolic
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AP_GROUPINFO("_FUNCTION", 4, RangeFinder, _function[0], 0),
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// @Param: _MIN_CM
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// @DisplayName: Rangefinder minimum distance
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// @Description: Minimum distance in centimeters that rangefinder can reliably read
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// @Units: centimeters
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// @Increment: 1
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AP_GROUPINFO("_MIN_CM", 5, RangeFinder, _min_distance_cm[0], 20),
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// @Param: _MAX_CM
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// @DisplayName: Rangefinder maximum distance
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// @Description: Maximum distance in centimeters that rangefinder can reliably read
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// @Units: centimeters
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// @Increment: 1
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AP_GROUPINFO("_MAX_CM", 6, RangeFinder, _max_distance_cm[0], 700),
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// @Param: _STOP_PIN
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// @DisplayName: Rangefinder stop pin
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// @Description: Digital pin that enables/disables rangefinder measurement for an analog rangefinder. A value of -1 means no pin. If this is set, then the pin is set to 1 to enable the rangefinder and set to 0 to disable it. This can be used to ensure that multiple sonar rangefinders don't interfere with each other.
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// @Values: -1:Not Used,50:Pixhawk AUXOUT1,51:Pixhawk AUXOUT2,52:Pixhawk AUXOUT3,53:Pixhawk AUXOUT4,54:Pixhawk AUXOUT5,55:Pixhawk AUXOUT6,111:PX4 FMU Relay1,112:PX4 FMU Relay2,113:PX4IO Relay1,114:PX4IO Relay2,115:PX4IO ACC1,116:PX4IO ACC2
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AP_GROUPINFO("_STOP_PIN", 7, RangeFinder, _stop_pin[0], -1),
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// @Param: _SETTLE
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// @DisplayName: Rangefinder settle time
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// @Description: The time in milliseconds that the rangefinder reading takes to settle. This is only used when a STOP_PIN is specified. It determines how long we have to wait for the rangefinder to give a reading after we set the STOP_PIN high. For a sonar rangefinder with a range of around 7m this would need to be around 50 milliseconds to allow for the sonar pulse to travel to the target and back again.
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// @Units: milliseconds
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// @Increment: 1
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AP_GROUPINFO("_SETTLE", 8, RangeFinder, _settle_time_ms[0], 0),
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// @Param: _RMETRIC
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// @DisplayName: Ratiometric
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// @Description: This parameter sets whether an analog rangefinder is ratiometric. Most analog rangefinders are ratiometric, meaning that their output voltage is influenced by the supply voltage. Some analog rangefinders (such as the SF/02) have their own internal voltage regulators so they are not ratiometric.
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// @Values: 0:No,1:Yes
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AP_GROUPINFO("_RMETRIC", 9, RangeFinder, _ratiometric[0], 1),
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// @Param: RNGFND_PWRRNG
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// @DisplayName: Powersave range
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// @Description: This parameter sets the estimated terrain distance in meters above which the sensor will be put into a power saving mode (if available). A value of zero means power saving is not enabled
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// @Units: meters
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// @Range: 0 32767
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AP_GROUPINFO("_PWRRNG", 10, RangeFinder, _powersave_range, 0),
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// @Param: _GNDCLEAR
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// @DisplayName: Distance (in cm) from the range finder to the ground
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// @Description: This parameter sets the expected range measurement(in cm) that the range finder should return when the vehicle is on the ground.
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// @Units: centimeters
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// @Range: 0 127
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// @Increment: 1
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// @User: Advanced
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AP_GROUPINFO("_GNDCLEAR", 11, RangeFinder, _ground_clearance_cm[0], RANGEFINDER_GROUND_CLEARANCE_CM_DEFAULT),
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// 10..12 left for future expansion
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#if RANGEFINDER_MAX_INSTANCES > 1
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// @Param: 2_TYPE
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// @DisplayName: Second Rangefinder type
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// @Description: What type of rangefinder device that is connected
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// @Values: 0:None,1:Analog,2:APM2-MaxbotixI2C,3:APM2-PulsedLightI2C,4:PX4-I2C,5:PX4-PWM
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AP_GROUPINFO("2_TYPE", 12, RangeFinder, _type[1], 0),
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// @Param: 2_PIN
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// @DisplayName: Rangefinder pin
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// @Description: Analog pin that rangefinder is connected to. Set this to 0..9 for the APM2 analog pins. Set to 64 on an APM1 for the dedicated 'airspeed' port on the end of the board. Set to 11 on PX4 for the analog 'airspeed' port. Set to 15 on the Pixhawk for the analog 'airspeed' port.
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// @Values: -1:Not Used, 0:APM2-A0, 1:APM2-A1, 2:APM2-A2, 3:APM2-A3, 4:APM2-A4, 5:APM2-A5, 6:APM2-A6, 7:APM2-A7, 8:APM2-A8, 9:APM2-A9, 11:PX4-airspeed port, 15:Pixhawk-airspeed port, 64:APM1-airspeed port
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AP_GROUPINFO("2_PIN", 13, RangeFinder, _pin[1], -1),
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// @Param: 2_SCALING
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// @DisplayName: Rangefinder scaling
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// @Description: Scaling factor between rangefinder reading and distance. For the linear and inverted functions this is in meters per volt. For the hyperbolic function the units are meterVolts.
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// @Units: meters/Volt
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// @Increment: 0.001
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AP_GROUPINFO("2_SCALING", 14, RangeFinder, _scaling[1], 3.0f),
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// @Param: 2_OFFSET
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// @DisplayName: rangefinder offset
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// @Description: Offset in volts for zero distance
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// @Units: Volts
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// @Increment: 0.001
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AP_GROUPINFO("2_OFFSET", 15, RangeFinder, _offset[1], 0.0f),
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// @Param: 2_FUNCTION
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// @DisplayName: Rangefinder function
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// @Description: Control over what function is used to calculate distance. For a linear function, the distance is (voltage-offset)*scaling. For a inverted function the distance is (offset-voltage)*scaling. For a hyperbolic function the distance is scaling/(voltage-offset). The functions return the distance in meters.
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// @Values: 0:Linear,1:Inverted,2:Hyperbolic
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AP_GROUPINFO("2_FUNCTION", 16, RangeFinder, _function[1], 0),
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// @Param: 2_MIN_CM
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// @DisplayName: Rangefinder minimum distance
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// @Description: Minimum distance in centimeters that rangefinder can reliably read
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// @Units: centimeters
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// @Increment: 1
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AP_GROUPINFO("2_MIN_CM", 17, RangeFinder, _min_distance_cm[1], 20),
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// @Param: 2_MAX_CM
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// @DisplayName: Rangefinder maximum distance
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// @Description: Maximum distance in centimeters that rangefinder can reliably read
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// @Units: centimeters
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// @Increment: 1
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AP_GROUPINFO("2_MAX_CM", 18, RangeFinder, _max_distance_cm[1], 700),
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// @Param: 2_STOP_PIN
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// @DisplayName: Rangefinder stop pin
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// @Description: Digital pin that enables/disables rangefinder measurement for an analog rangefinder. A value of -1 means no pin. If this is set, then the pin is set to 1 to enable the rangefinder and set to 0 to disable it. This can be used to ensure that multiple sonar rangefinders don't interfere with each other.
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// @Values: -1:Not Used,50:Pixhawk AUXOUT1,51:Pixhawk AUXOUT2,52:Pixhawk AUXOUT3,53:Pixhawk AUXOUT4,54:Pixhawk AUXOUT5,55:Pixhawk AUXOUT6,111:PX4 FMU Relay1,112:PX4 FMU Relay2,113:PX4IO Relay1,114:PX4IO Relay2,115:PX4IO ACC1,116:PX4IO ACC2
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AP_GROUPINFO("2_STOP_PIN", 19, RangeFinder, _stop_pin[1], -1),
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// @Param: 2_SETTLE
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// @DisplayName: Sonar settle time
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// @Description: The time in milliseconds that the rangefinder reading takes to settle. This is only used when a STOP_PIN is specified. It determines how long we have to wait for the rangefinder to give a reading after we set the STOP_PIN high. For a sonar rangefinder with a range of around 7m this would need to be around 50 milliseconds to allow for the sonar pulse to travel to the target and back again.
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// @Units: milliseconds
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// @Increment: 1
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AP_GROUPINFO("2_SETTLE", 20, RangeFinder, _settle_time_ms[1], 0),
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// @Param: 2_RMETRIC
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// @DisplayName: Ratiometric
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// @Description: This parameter sets whether an analog rangefinder is ratiometric. Most analog rangefinders are ratiometric, meaning that their output voltage is influenced by the supply voltage. Some analog rangefinders (such as the SF/02) have their own internal voltage regulators so they are not ratiometric.
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// @Values: 0:No,1:Yes
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AP_GROUPINFO("2_RMETRIC", 21, RangeFinder, _ratiometric[1], 1),
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// @Param: 2_GNDCLEAR
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// @DisplayName: Distance (in cm) from the second range finder to the ground
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// @Description: This parameter sets the expected range measurement(in cm) that the second range finder should return when the vehicle is on the ground.
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// @Units: centimeters
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// @Range: 0 127
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// @Increment: 1
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// @User: Advanced
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AP_GROUPINFO("2_GNDCLEAR", 22, RangeFinder, _ground_clearance_cm[1], RANGEFINDER_GROUND_CLEARANCE_CM_DEFAULT),
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#endif
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AP_GROUPEND
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};
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/*
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initialise the RangeFinder class. We do detection of attached range
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finders here. For now we won't allow for hot-plugging of
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rangefinders.
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*/
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void RangeFinder::init(void)
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{
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if (num_instances != 0) {
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// init called a 2nd time?
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return;
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}
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for (uint8_t i=0; i<RANGEFINDER_MAX_INSTANCES; i++) {
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detect_instance(i);
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if (drivers[i] != NULL) {
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// we loaded a driver for this instance, so it must be
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// present (although it may not be healthy)
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num_instances = i+1;
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}
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// initialise pre-arm check variables
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state[i].pre_arm_check = false;
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state[i].pre_arm_distance_min = 9999; // initialise to an arbitrary large value
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state[i].pre_arm_distance_max = 0;
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// initialise status
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state[i].status = RangeFinder_NotConnected;
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state[i].range_valid_count = 0;
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}
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}
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/*
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update RangeFinder state for all instances. This should be called at
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around 10Hz by main loop
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*/
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void RangeFinder::update(void)
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{
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for (uint8_t i=0; i<num_instances; i++) {
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if (drivers[i] != NULL) {
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if (_type[i] == RangeFinder_TYPE_NONE) {
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// allow user to disable a rangefinder at runtime
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state[i].status = RangeFinder_NotConnected;
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state[i].range_valid_count = 0;
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continue;
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}
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drivers[i]->update();
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update_pre_arm_check(i);
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}
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}
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// work out primary instance - first sensor returning good data
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for (int8_t i=num_instances-1; i>=0; i--) {
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if (drivers[i] != NULL && (state[i].status == RangeFinder_Good)) {
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primary_instance = i;
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}
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}
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}
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/*
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detect if an instance of a rangefinder is connected.
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*/
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void RangeFinder::detect_instance(uint8_t instance)
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{
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uint8_t type = _type[instance];
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#if CONFIG_HAL_BOARD == HAL_BOARD_PX4 || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN
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if (type == RangeFinder_TYPE_PLI2C ||
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type == RangeFinder_TYPE_MBI2C) {
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// I2C sensor types are handled by the PX4Firmware code
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type = RangeFinder_TYPE_PX4;
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}
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#endif
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if (type == RangeFinder_TYPE_PLI2C) {
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if (AP_RangeFinder_PulsedLightLRF::detect(*this, instance)) {
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state[instance].instance = instance;
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drivers[instance] = new AP_RangeFinder_PulsedLightLRF(*this, instance, state[instance]);
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return;
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}
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}
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if (type == RangeFinder_TYPE_MBI2C) {
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if (AP_RangeFinder_MaxsonarI2CXL::detect(*this, instance)) {
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state[instance].instance = instance;
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drivers[instance] = new AP_RangeFinder_MaxsonarI2CXL(*this, instance, state[instance]);
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return;
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}
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}
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#if CONFIG_HAL_BOARD == HAL_BOARD_PX4 || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN
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if (type == RangeFinder_TYPE_PX4) {
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if (AP_RangeFinder_PX4::detect(*this, instance)) {
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state[instance].instance = instance;
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drivers[instance] = new AP_RangeFinder_PX4(*this, instance, state[instance]);
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return;
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}
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}
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if (type == RangeFinder_TYPE_PX4_PWM) {
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if (AP_RangeFinder_PX4_PWM::detect(*this, instance)) {
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state[instance].instance = instance;
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drivers[instance] = new AP_RangeFinder_PX4_PWM(*this, instance, state[instance]);
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return;
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}
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}
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#endif
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if (type == RangeFinder_TYPE_ANALOG) {
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// note that analog must be the last to be checked, as it will
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// always come back as present if the pin is valid
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if (AP_RangeFinder_analog::detect(*this, instance)) {
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state[instance].instance = instance;
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drivers[instance] = new AP_RangeFinder_analog(*this, instance, state[instance]);
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return;
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}
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}
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}
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// query status
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RangeFinder::RangeFinder_Status RangeFinder::status(uint8_t instance) const
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{
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// sanity check instance
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if (instance > RANGEFINDER_MAX_INSTANCES) {
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return RangeFinder_NotConnected;
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}
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if (drivers[instance] == NULL || _type[instance] == RangeFinder_TYPE_NONE) {
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return RangeFinder_NotConnected;
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}
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return state[instance].status;
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}
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// true if sensor is returning data
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bool RangeFinder::has_data(uint8_t instance) const
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{
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// sanity check instance
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if (instance > RANGEFINDER_MAX_INSTANCES) {
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return RangeFinder_NotConnected;
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}
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return ((state[instance].status != RangeFinder_NotConnected) && (state[instance].status != RangeFinder_NoData));
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}
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/*
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returns true if pre-arm checks have passed for all range finders
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these checks involve the user lifting or rotating the vehicle so that sensor readings between
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the min and 2m can be captured
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*/
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bool RangeFinder::pre_arm_check() const
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{
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for (uint8_t i=0; i<num_instances; i++) {
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// if driver is valid but pre_arm_check is false, return false
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if ((drivers[i] != NULL) && (_type[i] != RangeFinder_TYPE_NONE) && !state[i].pre_arm_check) {
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return false;
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}
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}
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return true;
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}
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/*
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set pre-arm checks to passed if the range finder has been exercised through a reasonable range of movement
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max distance sensed is at least 50cm > min distance sensed
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max distance < 200cm
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min distance sensed is within 10cm of ground clearance or sensor's minimum distance
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*/
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void RangeFinder::update_pre_arm_check(uint8_t instance)
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{
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// return immediately if already passed or no sensor data
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if (state[instance].pre_arm_check || state[instance].status == RangeFinder_NotConnected || state[instance].status == RangeFinder_NoData) {
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return;
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}
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// update min, max captured distances
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state[instance].pre_arm_distance_min = min(state[instance].distance_cm, state[instance].pre_arm_distance_min);
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state[instance].pre_arm_distance_max = max(state[instance].distance_cm, state[instance].pre_arm_distance_max);
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// Check that the range finder has been exercised through a realistic range of movement
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if (((state[instance].pre_arm_distance_max - state[instance].pre_arm_distance_min) > RANGEFINDER_PREARM_REQUIRED_CHANGE_CM) &&
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(state[instance].pre_arm_distance_max < RANGEFINDER_PREARM_ALT_MAX_CM) &&
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((int16_t)state[instance].pre_arm_distance_min < (max(_ground_clearance_cm[instance],min_distance_cm(instance)) + 10)) &&
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((int16_t)state[instance].pre_arm_distance_min > (min(_ground_clearance_cm[instance],min_distance_cm(instance)) - 10))) {
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state[instance].pre_arm_check = true;
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}
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}
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