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Add kinematics suite (#1787)

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Co-authored-by: Tyler Veness <calcmogul@gmail.com>
Co-authored-by: Matt <matthew.morley.ca@gmail.com>
This commit is contained in:
Prateek Machiraju
2019-09-08 00:11:49 -04:00
committed by Peter Johnson
parent 561cbbd144
commit f405582f86
67 changed files with 5060 additions and 0 deletions
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wpilibcExamples/src/main/cpp/examples/MecanumBot/include/Drivetrain.h Normal file
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/*----------------------------------------------------------------------------*/
/* Copyright (c) 2019 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/Spark.h>
#include <frc/controller/PIDController.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(); }
/**
* Get the robot angle as a Rotation2d
*/
frc::Rotation2d GetAngle() const {
// Negating the angle because WPILib Gyros are CW positive.
return frc::Rotation2d(units::degree_t(-m_gyro.GetAngle()));
}
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 units::meters_per_second_t 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::Spark m_frontLeftMotor{1};
frc::Spark m_frontRightMotor{2};
frc::Spark m_backLeftMotor{3};
frc::Spark m_backRightMotor{4};
frc::Encoder m_frontLeftEncoder{0, 1};
frc::Encoder m_frontRightEncoder{0, 1};
frc::Encoder m_backLeftEncoder{0, 1};
frc::Encoder m_backRightEncoder{0, 1};
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};
frc::MecanumDriveOdometry m_odometry{m_kinematics};
};