Commit | Line | Data |
---|---|---|
e7bf265c RR |
1 | package org.usfirst.frc.team3501.robot.utils; |
2 | ||
3 | import java.util.TimerTask; | |
4 | import edu.wpi.first.wpilibj.I2C; | |
5 | import edu.wpi.first.wpilibj.Timer; | |
6 | import edu.wpi.first.wpilibj.I2C.Port; | |
7 | import edu.wpi.first.wpilibj.PIDSource; | |
8 | import edu.wpi.first.wpilibj.PIDSourceType; | |
9 | ||
10 | public class Lidar implements PIDSource { | |
11 | private I2C i2c; | |
12 | private byte[] distance; | |
13 | private java.util.Timer updater; | |
14 | ||
15 | private final int LIDAR_ADDR = 0x62; | |
16 | private final int LIDAR_CONFIG_REGISTER = 0x00; | |
17 | private final int LIDAR_DISTANCE_REGISTER = 0x8f; | |
18 | ||
19 | public Lidar(Port port) { | |
20 | i2c = new I2C(port, LIDAR_ADDR); | |
21 | ||
22 | distance = new byte[2]; | |
23 | ||
24 | updater = new java.util.Timer(); | |
25 | } | |
26 | ||
27 | // Distance in cm | |
28 | public int getDistance() { | |
29 | return (int) Integer.toUnsignedLong(distance[0] << 8) | |
30 | + Byte.toUnsignedInt(distance[1]); | |
31 | } | |
32 | ||
33 | @Override | |
34 | public double pidGet() { | |
35 | return getDistance(); | |
36 | } | |
37 | ||
38 | // Start 10Hz polling | |
39 | public void start() { | |
40 | updater.scheduleAtFixedRate(new LIDARUpdater(), 0, 100); | |
41 | } | |
42 | ||
43 | // Start polling for period in milliseconds | |
44 | public void start(int period) { | |
45 | updater.scheduleAtFixedRate(new LIDARUpdater(), 0, period); | |
46 | } | |
47 | ||
48 | public void stop() { | |
49 | updater.cancel(); | |
50 | updater = new java.util.Timer(); | |
51 | } | |
52 | ||
53 | // Update distance variable | |
54 | public void update() { | |
55 | i2c.write(LIDAR_CONFIG_REGISTER, 0x04); // Initiate measurement | |
56 | Timer.delay(0.04); // Delay for measurement to be taken | |
57 | i2c.read(LIDAR_DISTANCE_REGISTER, 2, distance); // Read in measurement | |
58 | Timer.delay(0.005); // Delay to prevent over polling | |
59 | } | |
60 | ||
61 | // Timer task to keep distance updated | |
62 | private class LIDARUpdater extends TimerTask { | |
63 | @Override | |
64 | public void run() { | |
65 | while (true) { | |
66 | update(); | |
67 | try { | |
68 | Thread.sleep(10); | |
69 | } catch (InterruptedException e) { | |
70 | e.printStackTrace(); | |
71 | } | |
72 | } | |
73 | } | |
74 | } | |
75 | ||
76 | @Override | |
77 | public void setPIDSourceType(PIDSourceType pidSource) { | |
78 | // TODO Auto-generated method stub | |
79 | ||
80 | } | |
81 | ||
82 | @Override | |
83 | public PIDSourceType getPIDSourceType() { | |
84 | // TODO Auto-generated method stub | |
85 | return null; | |
86 | } | |
87 | } |