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[wpilib] Add pose estimators (#2867)

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Pose and state estimators can filter latency-compensated global measurements and fuse them with state-space drivetrain model information to estimate robot position. They are drop-in replacements for the existing odometry classes.

Co-authored-by: Declan Freeman-Gleason <declanfreemangleason@gmail.com>
Co-authored-by: Prateek Machiraju <prateek.machiraju@gmail.com>
Co-authored-by: Claudius Tewari <cttewari@gmail.com>
Co-authored-by: Matt <matthew.morley.ca@gmail.com>
This commit is contained in:
Declan Freeman-Gleason
2020-11-28 17:35:35 -05:00
committed by GitHub
parent 3413bfc06a
commit bc8f338771
58 changed files with 4958 additions and 39 deletions
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65
wpilibcExamples/src/main/cpp/examples/MecanumDrivePoseEstimator/cpp/Drivetrain.cpp Normal file
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/*----------------------------------------------------------------------------*/
/* Copyright (c) 2019-2020 FIRST. All Rights Reserved. */
/* Open Source Software - may be modified and shared by FRC teams. The code */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project. */
/*----------------------------------------------------------------------------*/
#include "Drivetrain.h"
#include <frc2/Timer.h>
#include "ExampleGlobalMeasurementSensor.h"
frc::MecanumDriveWheelSpeeds Drivetrain::GetCurrentState() const {
return {units::meters_per_second_t(m_frontLeftEncoder.GetRate()),
units::meters_per_second_t(m_frontRightEncoder.GetRate()),
units::meters_per_second_t(m_backLeftEncoder.GetRate()),
units::meters_per_second_t(m_backRightEncoder.GetRate())};
}
void Drivetrain::SetSpeeds(const frc::MecanumDriveWheelSpeeds& wheelSpeeds) {
std::function<void(units::meters_per_second_t, const frc::Encoder&,
frc2::PIDController&, frc::PWMVictorSPX&)>
calcAndSetSpeeds =
[&m_feedforward = m_feedforward](units::meters_per_second_t speed,
const auto& encoder,
auto& controller, auto& motor) {
auto feedforward = m_feedforward.Calculate(speed);
double output =
controller.Calculate(encoder.GetRate(), speed.to<double>());
motor.SetVoltage(units::volt_t{output} + feedforward);
};
calcAndSetSpeeds(wheelSpeeds.frontLeft, m_frontLeftEncoder,
m_frontLeftPIDController, m_frontLeftMotor);
calcAndSetSpeeds(wheelSpeeds.frontRight, m_frontRightEncoder,
m_frontRightPIDController, m_frontRightMotor);
calcAndSetSpeeds(wheelSpeeds.rearLeft, m_backLeftEncoder,
m_backLeftPIDController, m_backLeftMotor);
calcAndSetSpeeds(wheelSpeeds.rearRight, m_backRightEncoder,
m_backRightPIDController, m_backRightMotor);
}
void Drivetrain::Drive(units::meters_per_second_t xSpeed,
units::meters_per_second_t ySpeed,
units::radians_per_second_t rot, bool fieldRelative) {
auto wheelSpeeds = m_kinematics.ToWheelSpeeds(
fieldRelative ? frc::ChassisSpeeds::FromFieldRelativeSpeeds(
xSpeed, ySpeed, rot, m_gyro.GetRotation2d())
: frc::ChassisSpeeds{xSpeed, ySpeed, rot});
wheelSpeeds.Normalize(kMaxSpeed);
SetSpeeds(wheelSpeeds);
}
void Drivetrain::UpdateOdometry() {
m_poseEstimator.Update(m_gyro.GetRotation2d(), GetCurrentState());
// Also apply vision measurements. We use 0.3 seconds in the past as an
// example -- on a real robot, this must be calculated based either on latency
// or timestamps.
m_poseEstimator.AddVisionMeasurement(
ExampleGlobalMeasurementSensor::GetEstimatedGlobalPose(
m_poseEstimator.GetEstimatedPosition()),
frc2::Timer::GetFPGATimestamp() - 0.3_s);
}

61
wpilibcExamples/src/main/cpp/examples/MecanumDrivePoseEstimator/cpp/Robot.cpp Normal file
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/*----------------------------------------------------------------------------*/
/* Copyright (c) 2019-2020 FIRST. All Rights Reserved. */
/* Open Source Software - may be modified and shared by FRC teams. The code */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project. */
/*----------------------------------------------------------------------------*/
#include <frc/SlewRateLimiter.h>
#include <frc/TimedRobot.h>
#include <frc/XboxController.h>
#include "Drivetrain.h"
class Robot : public frc::TimedRobot {
public:
void AutonomousPeriodic() override {
DriveWithJoystick(false);
m_mecanum.UpdateOdometry();
}
void TeleopPeriodic() override { DriveWithJoystick(true); }
private:
frc::XboxController m_controller{0};
Drivetrain m_mecanum;
// Slew rate limiters to make joystick inputs more gentle; 1/3 sec from 0
// to 1.
frc::SlewRateLimiter<units::scalar> m_xspeedLimiter{3 / 1_s};
frc::SlewRateLimiter<units::scalar> m_yspeedLimiter{3 / 1_s};
frc::SlewRateLimiter<units::scalar> m_rotLimiter{3 / 1_s};
void DriveWithJoystick(bool fieldRelative) {
// Get the x speed. We are inverting this because Xbox controllers return
// negative values when we push forward.
const auto xSpeed = -m_xspeedLimiter.Calculate(
m_controller.GetY(frc::GenericHID::kLeftHand)) *
Drivetrain::kMaxSpeed;
// Get the y speed or sideways/strafe speed. We are inverting this because
// we want a positive value when we pull to the left. Xbox controllers
// return positive values when you pull to the right by default.
const auto ySpeed = -m_yspeedLimiter.Calculate(
m_controller.GetX(frc::GenericHID::kLeftHand)) *
Drivetrain::kMaxSpeed;
// Get the rate of angular rotation. We are inverting this because we want a
// positive value when we pull to the left (remember, CCW is positive in
// mathematics). Xbox controllers return positive values when you pull to
// the right by default.
const auto rot = -m_rotLimiter.Calculate(
m_controller.GetX(frc::GenericHID::kRightHand)) *
Drivetrain::kMaxAngularSpeed;
m_mecanum.Drive(xSpeed, ySpeed, rot, fieldRelative);
}
};
#ifndef RUNNING_FRC_TESTS
int main() { return frc::StartRobot<Robot>(); }
#endif

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wpilibcExamples/src/main/cpp/examples/MecanumDrivePoseEstimator/include/Drivetrain.h Normal file
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/*----------------------------------------------------------------------------*/
/* Copyright (c) 2019-2020 FIRST. All Rights Reserved. */
/* Open Source Software - may be modified and shared by FRC teams. The code */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project. */
/*----------------------------------------------------------------------------*/
#pragma once
#include <frc/AnalogGyro.h>
#include <frc/Encoder.h>
#include <frc/PWMVictorSPX.h>
#include <frc/controller/PIDController.h>
#include <frc/controller/SimpleMotorFeedforward.h>
#include <frc/estimator/MecanumDrivePoseEstimator.h>
#include <frc/geometry/Translation2d.h>
#include <frc/kinematics/MecanumDriveKinematics.h>
#include <frc/kinematics/MecanumDriveOdometry.h>
#include <frc/kinematics/MecanumDriveWheelSpeeds.h>
#include <wpi/math>
/**
* Represents a mecanum drive style drivetrain.
*/
class Drivetrain {
public:
Drivetrain() { m_gyro.Reset(); }
frc::MecanumDriveWheelSpeeds GetCurrentState() const;
void SetSpeeds(const frc::MecanumDriveWheelSpeeds& wheelSpeeds);
void Drive(units::meters_per_second_t xSpeed,
units::meters_per_second_t ySpeed, units::radians_per_second_t rot,
bool fieldRelative);
void UpdateOdometry();
static constexpr auto kMaxSpeed = 3.0_mps; // 3 meters per second
static constexpr units::radians_per_second_t kMaxAngularSpeed{
wpi::math::pi}; // 1/2 rotation per second
private:
frc::PWMVictorSPX m_frontLeftMotor{1};
frc::PWMVictorSPX m_frontRightMotor{2};
frc::PWMVictorSPX m_backLeftMotor{3};
frc::PWMVictorSPX m_backRightMotor{4};
frc::Encoder m_frontLeftEncoder{0, 1};
frc::Encoder m_frontRightEncoder{2, 3};
frc::Encoder m_backLeftEncoder{4, 5};
frc::Encoder m_backRightEncoder{6, 7};
frc::Translation2d m_frontLeftLocation{0.381_m, 0.381_m};
frc::Translation2d m_frontRightLocation{0.381_m, -0.381_m};
frc::Translation2d m_backLeftLocation{-0.381_m, 0.381_m};
frc::Translation2d m_backRightLocation{-0.381_m, -0.381_m};
frc2::PIDController m_frontLeftPIDController{1.0, 0.0, 0.0};
frc2::PIDController m_frontRightPIDController{1.0, 0.0, 0.0};
frc2::PIDController m_backLeftPIDController{1.0, 0.0, 0.0};
frc2::PIDController m_backRightPIDController{1.0, 0.0, 0.0};
frc::AnalogGyro m_gyro{0};
frc::MecanumDriveKinematics m_kinematics{
m_frontLeftLocation, m_frontRightLocation, m_backLeftLocation,
m_backRightLocation};
// Gains are for example purposes only - must be determined for your own
// robot!
frc::SimpleMotorFeedforward<units::meters> m_feedforward{1_V, 3_V / 1_mps};
// Gains are for example purposes only - must be determined for your own
// robot!
frc::MecanumDrivePoseEstimator m_poseEstimator{
frc::Rotation2d(), frc::Pose2d(), m_kinematics,
{0.1, 0.1, 0.1}, {0.05}, {0.1, 0.1, 0.1}};
};

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wpilibcExamples/src/main/cpp/examples/MecanumDrivePoseEstimator/include/ExampleGlobalMeasurementSensor.h Normal file
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/*----------------------------------------------------------------------------*/
/* Copyright (c) 2020 FIRST. All Rights Reserved. */
/* Open Source Software - may be modified and shared by FRC teams. The code */
/* must be accompanied by the FIRST BSD license file in the root directory of */
/* the project. */
/*----------------------------------------------------------------------------*/
#pragma once
#include <frc/StateSpaceUtil.h>
#include <frc/geometry/Pose2d.h>
/**
* This dummy class represents a global measurement sensor, such as a computer
* vision solution.
*/
class ExampleGlobalMeasurementSensor {
public:
static frc::Pose2d GetEstimatedGlobalPose(
const frc::Pose2d& estimatedRobotPose) {
auto randVec = frc::MakeWhiteNoiseVector(0.1, 0.1, 0.1);
return frc::Pose2d(estimatedRobotPose.X() + units::meter_t(randVec(0)),
estimatedRobotPose.Y() + units::meter_t(randVec(1)),
estimatedRobotPose.Rotation() +
frc::Rotation2d(units::radian_t(randVec(3))));
}
};