allwpilib/wpilibcExamples/src/main/cpp/examples/ArmBot/include/subsystems/DriveSubsystem.h

// Copyright (c) FIRST and other WPILib contributors.
// Open Source Software; you can modify and/or share it under the terms of
// the WPILib BSD license file in the root directory of this project.

#pragma once

#include <frc/Encoder.h>
#include <frc/drive/DifferentialDrive.h>
#include <frc/motorcontrol/MotorControllerGroup.h>
#include <frc/motorcontrol/PWMSparkMax.h>
#include <frc2/command/Subsystem.h>

#include "Constants.h"

class DriveSubsystem : public frc2::Subsystem {
 public:
  DriveSubsystem();

  /**
   * Will be called periodically whenever the CommandScheduler runs.
   */
  void Periodic() override;

  // Subsystem methods go here.

  /**
   * Drives the robot using arcade controls.
   *
   * @param fwd the commanded forward movement
   * @param rot the commanded rotation
   */
  void ArcadeDrive(double fwd, double rot);

  /**
   * Resets the drive encoders to currently read a position of 0.
   */
  void ResetEncoders();

  /**
   * Gets the average distance of the TWO encoders.
   *
   * @return the average of the TWO encoder readings
   */
  double GetAverageEncoderDistance();

  /**
   * Gets the left drive encoder.
   *
   * @return the left drive encoder
   */
  frc::Encoder& GetLeftEncoder();

  /**
   * Gets the right drive encoder.
   *
   * @return the right drive encoder
   */
  frc::Encoder& GetRightEncoder();

  /**
   * Sets the max output of the drive.  Useful for scaling the drive to drive
   * more slowly.
   *
   * @param maxOutput the maximum output to which the drive will be constrained
   */
  void SetMaxOutput(double maxOutput);

 private:
  // Components (e.g. motor controllers and sensors) should generally be
  // declared private and exposed only through public methods.

  // The motor controllers
  frc::PWMSparkMax m_left1;
  frc::PWMSparkMax m_left2;
  frc::PWMSparkMax m_right1;
  frc::PWMSparkMax m_right2;

  // The motors on the left side of the drive
  frc::MotorControllerGroup m_leftMotors{m_left1, m_left2};

  // The motors on the right side of the drive
  frc::MotorControllerGroup m_rightMotors{m_right1, m_right2};

  // The robot's drive
  frc::DifferentialDrive m_drive{m_leftMotors, m_rightMotors};

  // The left-side drive encoder
  frc::Encoder m_leftEncoder;

  // The right-side drive encoder
  frc::Encoder m_rightEncoder;
};