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38a404b3 KZ |
1 | package org.usfirst.frc.team3501.robot.subsystems; |
2 | ||
3 | import org.usfirst.frc.team3501.robot.Constants; | |
33141cdd KZ |
4 | import org.usfirst.frc.team3501.robot.GyroLib; |
5 | import org.usfirst.frc.team3501.robot.MathLib; | |
6 | import org.usfirst.frc.team3501.robot.commands.driving.JoystickDrive; | |
111dc444 | 7 | |
38a404b3 | 8 | import edu.wpi.first.wpilibj.CANTalon; |
111dc444 | 9 | import edu.wpi.first.wpilibj.CounterBase.EncodingType; |
d9c04720 | 10 | import edu.wpi.first.wpilibj.DoubleSolenoid; |
2aea5cc2 | 11 | import edu.wpi.first.wpilibj.DoubleSolenoid.Value; |
111dc444 | 12 | import edu.wpi.first.wpilibj.Encoder; |
b54ad73b | 13 | import edu.wpi.first.wpilibj.I2C; |
33141cdd KZ |
14 | import edu.wpi.first.wpilibj.RobotDrive; |
15 | import edu.wpi.first.wpilibj.command.PIDSubsystem; | |
16 | ||
17 | public class DriveTrain extends PIDSubsystem { | |
7a4df3c5 KZ |
18 | // Encoder PID Proportional Constants P, I, and D |
19 | private static double EP = 0.013, EI = 0.000015, ED = -0.002; | |
20 | ||
21 | // Gyro PID Constants P, I, and D | |
22 | private static double GP = 0.018, GI = 0.000015, GD = 0; | |
33141cdd | 23 | private static double pidOutput = 0; |
7a4df3c5 KZ |
24 | |
25 | // PID Controller tolerances for the error | |
33141cdd | 26 | private static double encoderTolerance = 8.0, gyroTolerance = 5.0; |
7a4df3c5 KZ |
27 | |
28 | // Current Drive Mode Default Drive Mode is Manual | |
33141cdd KZ |
29 | private int DRIVE_MODE = 1; |
30 | ||
7a4df3c5 | 31 | // Different Drive Modes |
33141cdd | 32 | private static final int MANUAL_MODE = 1, ENCODER_MODE = 2, GYRO_MODE = 3; |
38a404b3 | 33 | |
1884c3cf | 34 | private Encoder leftEncoder, rightEncoder; |
d7bf2340 | 35 | private CANTalon frontLeft, frontRight, rearLeft, rearRight; |
33141cdd KZ |
36 | private RobotDrive robotDrive; |
37 | ||
38 | private GyroLib gyro; | |
d9c04720 | 39 | private DoubleSolenoid leftGearPiston, rightGearPiston; |
9e65c056 ME |
40 | // Drivetrain specific constants that relate to the inches per pulse value for |
41 | // the encoders | |
42 | private final static double WHEEL_DIAMETER = 6.0; // in inches | |
43 | private final static double PULSES_PER_ROTATION = 256; // in pulses | |
44 | private final static double OUTPUT_SPROCKET_DIAMETER = 2.0; // in inches | |
45 | private final static double WHEEL_SPROCKET_DIAMETER = 3.5; // in inches | |
46 | public final static double INCHES_PER_PULSE = (((Math.PI) | |
47 | * OUTPUT_SPROCKET_DIAMETER / PULSES_PER_ROTATION) | |
48 | / WHEEL_SPROCKET_DIAMETER) * WHEEL_DIAMETER; | |
49 | ||
50 | // Drivetrain specific constants that relate to the PID controllers | |
51 | private final static double Kp = 1.0, Ki = 0.0, | |
52 | Kd = 0.0 * (OUTPUT_SPROCKET_DIAMETER / PULSES_PER_ROTATION) | |
53 | / (WHEEL_SPROCKET_DIAMETER) * WHEEL_DIAMETER; | |
71d73690 | 54 | |
d7bf2340 | 55 | public DriveTrain() { |
9e65c056 | 56 | super(kp, ki, kd); |
33141cdd | 57 | |
d7bf2340 KZ |
58 | frontLeft = new CANTalon(Constants.DriveTrain.FRONT_LEFT); |
59 | frontRight = new CANTalon(Constants.DriveTrain.FRONT_RIGHT); | |
60 | rearLeft = new CANTalon(Constants.DriveTrain.REAR_LEFT); | |
61 | rearRight = new CANTalon(Constants.DriveTrain.REAR_RIGHT); | |
1884c3cf | 62 | |
33141cdd | 63 | robotDrive = new RobotDrive(frontLeft, rearLeft, frontRight, rearRight); |
d7bf2340 KZ |
64 | leftEncoder = new Encoder(Constants.DriveTrain.ENCODER_LEFT_A, |
65 | Constants.DriveTrain.ENCODER_LEFT_B, false, EncodingType.k4X); | |
66 | rightEncoder = new Encoder(Constants.DriveTrain.ENCODER_RIGHT_A, | |
67 | Constants.DriveTrain.ENCODER_RIGHT_B, false, EncodingType.k4X); | |
45bdf5b9 KZ |
68 | leftEncoder.setDistancePerPulse(Constants.DriveTrain.INCHES_PER_PULSE); |
69 | rightEncoder.setDistancePerPulse(Constants.DriveTrain.INCHES_PER_PULSE); | |
33141cdd KZ |
70 | |
71 | leftEncoder.setDistancePerPulse(Constants.DriveTrain.INCHES_PER_PULSE); | |
72 | rightEncoder.setDistancePerPulse(Constants.DriveTrain.INCHES_PER_PULSE); | |
73 | ||
74 | gyro = new GyroLib(I2C.Port.kOnboard, false); | |
75 | ||
76 | DRIVE_MODE = Constants.DriveTrain.ENCODER_MODE; | |
77 | setEncoderPID(); | |
78 | this.disable(); | |
79 | gyro.start(); | |
d004deee | 80 | |
d9c04720 | 81 | leftGearPiston = new DoubleSolenoid(Constants.DriveTrain.LEFT_FORWARD, |
7a4df3c5 | 82 | Constants.DriveTrain.LEFT_REVERSE); |
d9c04720 SC |
83 | rightGearPiston = new DoubleSolenoid(Constants.DriveTrain.RIGHT_FORWARD, |
84 | Constants.DriveTrain.RIGHT_REVERSE); | |
d7bf2340 KZ |
85 | } |
86 | ||
87 | @Override | |
88 | protected void initDefaultCommand() { | |
33141cdd KZ |
89 | setDefaultCommand(new JoystickDrive()); |
90 | } | |
91 | ||
7a4df3c5 | 92 | // Print tne PID Output |
33141cdd KZ |
93 | public void printOutput() { |
94 | System.out.println("PIDOutput: " + pidOutput); | |
95 | } | |
96 | ||
97 | private double getAvgEncoderDistance() { | |
98 | return (leftEncoder.getDistance() + rightEncoder.getDistance()) / 2; | |
99 | } | |
100 | ||
7a4df3c5 KZ |
101 | // Whether or not the PID Controller thinks we have reached the target |
102 | // setpoint | |
33141cdd KZ |
103 | public boolean reachedTarget() { |
104 | if (this.onTarget()) { | |
105 | this.disable(); | |
106 | return true; | |
107 | } else { | |
108 | return false; | |
109 | } | |
110 | } | |
111 | ||
112 | public void stop() { | |
113 | drive(0, 0); | |
d7bf2340 KZ |
114 | } |
115 | ||
116 | public void resetEncoders() { | |
117 | leftEncoder.reset(); | |
118 | rightEncoder.reset(); | |
119 | } | |
120 | ||
d7bf2340 | 121 | public double getRightSpeed() { |
6833a887 | 122 | return rightEncoder.getRate(); // in inches per second |
d7bf2340 KZ |
123 | } |
124 | ||
125 | public double getLeftSpeed() { | |
6833a887 | 126 | return leftEncoder.getRate(); // in inches per second |
d7bf2340 KZ |
127 | } |
128 | ||
129 | public double getSpeed() { | |
6833a887 | 130 | return (getLeftSpeed() + getRightSpeed()) / 2.0; // in inches per second |
d7bf2340 KZ |
131 | } |
132 | ||
d7bf2340 | 133 | public double getRightDistance() { |
6833a887 | 134 | return rightEncoder.getDistance(); // in inches |
d7bf2340 KZ |
135 | } |
136 | ||
d7bf2340 | 137 | public double getLeftDistance() { |
6833a887 | 138 | return leftEncoder.getDistance(); // in inches |
d7bf2340 KZ |
139 | } |
140 | ||
7a4df3c5 KZ |
141 | // Get error between the setpoint of PID Controller and the current state of |
142 | // the robot | |
33141cdd KZ |
143 | public double getError() { |
144 | if (DRIVE_MODE == Constants.DriveTrain.ENCODER_MODE) | |
145 | return Math.abs(this.getSetpoint() - getAvgEncoderDistance()); | |
146 | else | |
147 | return Math.abs(this.getSetpoint() + getGyroAngle()); | |
d7bf2340 KZ |
148 | } |
149 | ||
33141cdd KZ |
150 | public double getGyroAngle() { |
151 | return gyro.getRotationZ().getAngle(); | |
152 | } | |
153 | ||
154 | public void resetGyro() { | |
155 | gyro.reset(); | |
156 | } | |
157 | ||
158 | public void printEncoder(int i, int n) { | |
159 | if (i % n == 0) { | |
160 | System.out.println("Left: " + this.getLeftDistance()); | |
161 | System.out.println("Right: " + this.getRightDistance()); | |
162 | ||
163 | } | |
164 | } | |
165 | ||
166 | public void printGyroOutput() { | |
167 | System.out.println("Gyro Angle" + -this.getGyroAngle()); | |
168 | } | |
169 | ||
7a4df3c5 KZ |
170 | /* |
171 | * returns the PID output that is returned by the PID Controller | |
172 | */ | |
33141cdd KZ |
173 | public double getOutput() { |
174 | return pidOutput; | |
175 | } | |
176 | ||
7a4df3c5 | 177 | // Updates the PID constants based on which control mode is being used |
33141cdd KZ |
178 | public void updatePID() { |
179 | if (DRIVE_MODE == Constants.DriveTrain.ENCODER_MODE) | |
9e65c056 | 180 | this.getPIDController().setPID(kp, ki, kd); |
33141cdd | 181 | else |
9e65c056 | 182 | this.getPIDController().setPID(gp, gd, gi); |
33141cdd KZ |
183 | } |
184 | ||
185 | public CANTalon getFrontLeft() { | |
186 | return frontLeft; | |
187 | } | |
188 | ||
189 | public CANTalon getFrontRight() { | |
190 | return frontRight; | |
191 | } | |
192 | ||
193 | public CANTalon getRearLeft() { | |
194 | return rearLeft; | |
195 | } | |
196 | ||
197 | public CANTalon getRearRight() { | |
198 | return rearRight; | |
199 | } | |
200 | ||
201 | public int getMode() { | |
202 | return DRIVE_MODE; | |
203 | } | |
204 | ||
7a4df3c5 KZ |
205 | /* |
206 | * Method is a required method that the PID Subsystem uses to return the | |
207 | * calculated PID value to the driver | |
208 | * | |
209 | * @param Gives the user the output from the PID algorithm that is calculated | |
210 | * internally | |
211 | * | |
212 | * Body: Uses the output, does some filtering and drives the robot | |
213 | */ | |
33141cdd KZ |
214 | @Override |
215 | protected void usePIDOutput(double output) { | |
216 | double left = 0; | |
217 | double right = 0; | |
218 | if (DRIVE_MODE == Constants.DriveTrain.ENCODER_MODE) { | |
219 | double drift = this.getLeftDistance() - this.getRightDistance(); | |
220 | if (Math.abs(output) > 0 && Math.abs(output) < 0.3) | |
221 | output = Math.signum(output) * 0.3; | |
222 | left = output; | |
9e65c056 | 223 | right = output + drift * kp / 10; |
7a4df3c5 KZ |
224 | } |
225 | else if (DRIVE_MODE == Constants.DriveTrain.GYRO_MODE) { | |
33141cdd KZ |
226 | left = output; |
227 | right = -output; | |
228 | } | |
229 | drive(left, right); | |
230 | pidOutput = output; | |
d7bf2340 KZ |
231 | } |
232 | ||
33141cdd KZ |
233 | @Override |
234 | protected double returnPIDInput() { | |
235 | return sensorFeedback(); | |
d7bf2340 | 236 | } |
33141cdd | 237 | |
7a4df3c5 KZ |
238 | /* |
239 | * Checks the drive mode | |
240 | * | |
241 | * @return the current state of the robot in each state | |
242 | * Average distance from both sides of tank drive for Encoder Mode | |
243 | * Angle from the gyro in GYRO_MODE | |
244 | */ | |
33141cdd KZ |
245 | private double sensorFeedback() { |
246 | if (DRIVE_MODE == Constants.DriveTrain.ENCODER_MODE) | |
247 | return getAvgEncoderDistance(); | |
248 | else if (DRIVE_MODE == Constants.DriveTrain.GYRO_MODE) | |
249 | return -this.getGyroAngle(); | |
250 | // counterclockwise is positive on joystick but we want it to be negative | |
251 | else | |
252 | return 0; | |
253 | } | |
254 | ||
7a4df3c5 KZ |
255 | /* |
256 | * @param left and right setpoints to set to the left and right side of tank | |
257 | * inverted is for Logan, wants the robot to invert all controls left = right | |
258 | * and right = left | |
259 | * negative input is required for the regular rotation because RobotDrive | |
260 | * tankdrive method drives inverted | |
261 | */ | |
33141cdd | 262 | public void drive(double left, double right) { |
9e65c056 | 263 | robotDrive.tankDrive(-left, -right); |
33141cdd KZ |
264 | // dunno why but inverted drive (- values is forward) |
265 | } | |
266 | ||
7a4df3c5 KZ |
267 | /* |
268 | * constrains the distance to within -100 and 100 since we aren't going to | |
269 | * drive more than 100 inches | |
270 | * | |
271 | * Configure Encoder PID | |
272 | * | |
273 | * Sets the setpoint to the PID subsystem | |
274 | */ | |
33141cdd KZ |
275 | public void driveDistance(double dist, double maxTimeOut) { |
276 | dist = MathLib.constrain(dist, -100, 100); | |
277 | setEncoderPID(); | |
278 | setSetpoint(dist); | |
279 | } | |
280 | ||
7a4df3c5 KZ |
281 | /* |
282 | * Sets the encoder mode | |
283 | * Updates the PID constants sets the tolerance and sets output/input ranges | |
284 | * Enables the PID controllers | |
285 | */ | |
33141cdd KZ |
286 | public void setEncoderPID() { |
287 | DRIVE_MODE = Constants.DriveTrain.ENCODER_MODE; | |
288 | this.updatePID(); | |
289 | this.setAbsoluteTolerance(encoderTolerance); | |
290 | this.setOutputRange(-1.0, 1.0); | |
291 | this.setInputRange(-200.0, 200.0); | |
292 | this.enable(); | |
293 | } | |
294 | ||
7a4df3c5 KZ |
295 | /* |
296 | * Sets the Gyro Mode | |
297 | * Updates the PID constants, sets the tolerance and sets output/input ranges | |
298 | * Enables the PID controllers | |
299 | */ | |
33141cdd KZ |
300 | private void setGyroPID() { |
301 | DRIVE_MODE = Constants.DriveTrain.GYRO_MODE; | |
302 | this.updatePID(); | |
9e65c056 | 303 | this.getPIDController().setPID(gp, gi, gd); |
33141cdd KZ |
304 | |
305 | this.setAbsoluteTolerance(gyroTolerance); | |
306 | this.setOutputRange(-1.0, 1.0); | |
307 | this.setInputRange(-360.0, 360.0); | |
308 | this.enable(); | |
309 | } | |
310 | ||
7a4df3c5 KZ |
311 | /* |
312 | * Turning method that should be used repeatedly in a command | |
313 | * | |
314 | * First constrains the angle to within -360 and 360 since that is as much as | |
315 | * we need to turn | |
316 | * | |
317 | * Configures Gyro PID and sets the setpoint as an angle | |
318 | */ | |
33141cdd KZ |
319 | public void turnAngle(double angle) { |
320 | angle = MathLib.constrain(angle, -360, 360); | |
321 | setGyroPID(); | |
322 | setSetpoint(angle); | |
323 | } | |
324 | ||
325 | public void setMotorSpeeds(double left, double right) { | |
326 | // positive setpoint to left side makes it go backwards | |
327 | // positive setpoint to right side makes it go forwards. | |
328 | frontLeft.set(-left); | |
329 | rearLeft.set(-left); | |
330 | frontRight.set(right); | |
331 | rearRight.set(right); | |
332 | } | |
333 | ||
7a4df3c5 KZ |
334 | /* |
335 | * @return a value that is the current setpoint for the piston | |
336 | * kReverse or kForward | |
337 | */ | |
2a099bc6 KZ |
338 | public Value getLeftGearPistonValue() { |
339 | return leftGearPiston.get(); | |
340 | } | |
341 | ||
7a4df3c5 KZ |
342 | /* |
343 | * @return a value that is the current setpoint for the piston | |
344 | * kReverse or kForward | |
345 | */ | |
2a099bc6 KZ |
346 | public Value getRightGearPistonValue() { |
347 | return rightGearPiston.get(); | |
348 | } | |
349 | ||
7a4df3c5 KZ |
350 | /* |
351 | * Changes the ball shift gear assembly to high | |
352 | */ | |
2a099bc6 KZ |
353 | public void setHighGear() { |
354 | changeGear(Constants.DriveTrain.HIGH_GEAR); | |
355 | } | |
356 | ||
7a4df3c5 KZ |
357 | /* |
358 | * Changes the ball shift gear assembly to low | |
359 | */ | |
2a099bc6 KZ |
360 | public void setLowGear() { |
361 | changeGear(Constants.DriveTrain.LOW_GEAR); | |
362 | } | |
363 | ||
7a4df3c5 KZ |
364 | /* |
365 | * changes the gear to a DoubleSolenoid.Value | |
366 | */ | |
2a099bc6 KZ |
367 | public void changeGear(DoubleSolenoid.Value gear) { |
368 | leftGearPiston.set(gear); | |
369 | rightGearPiston.set(gear); | |
370 | } | |
38a404b3 | 371 | } |