Fix some style errors

[3501/stronghold-2016] / src / org / usfirst / frc / team3501 / robot / Lidar.java

package org.usfirst.frc.team3501.robot;

import java.util.TimerTask;

import edu.wpi.first.wpilibj.I2C;
import edu.wpi.first.wpilibj.I2C.Port;
import edu.wpi.first.wpilibj.PIDSource;
import edu.wpi.first.wpilibj.PIDSourceType;
import edu.wpi.first.wpilibj.Timer;

public class Lidar implements PIDSource {
  private I2C i2c;
  private byte[] distance;
  private java.util.Timer updater;

  private final int LIDAR_ADDR = 0x62;
  private final int LIDAR_CONFIG_REGISTER = 0x00;
  private final int LIDAR_DISTANCE_REGISTER = 0x8f;

  public Lidar(Port port) {
    i2c = new I2C(port, LIDAR_ADDR);

    distance = new byte[2];

    updater = new java.util.Timer();
  }

  // Distance in cm
  public int getDistance() {
    return (int) Integer.toUnsignedLong(distance[0] << 8)
        + Byte.toUnsignedInt(distance[1]);
  }

  @Override
  public double pidGet() {
    return getDistance();
  }

  // Start 10Hz polling
  public void start() {
    updater.scheduleAtFixedRate(new LIDARUpdater(), 0, 100);
  }

  // Start polling for period in milliseconds
  public void start(int period) {
    updater.scheduleAtFixedRate(new LIDARUpdater(), 0, period);
  }

  public void stop() {
    updater.cancel();
    updater = new java.util.Timer();
  }

  // Update distance variable
  public void update() {
    i2c.write(LIDAR_CONFIG_REGISTER, 0x04); // Initiate measurement
    Timer.delay(0.04); // Delay for measurement to be taken
    i2c.read(LIDAR_DISTANCE_REGISTER, 2, distance); // Read in measurement
    Timer.delay(0.005); // Delay to prevent over polling
  }

  // Timer task to keep distance updated
  private class LIDARUpdater extends TimerTask {
    @Override
    public void run() {
      while (true) {
        update();
        try {
          Thread.sleep(10);
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
    }
  }

  @Override
  public void setPIDSourceType(PIDSourceType pidSource) {
  }

  @Override
  public PIDSourceType getPIDSourceType() {
    return null;
  }
}