2 # -*- coding: iso-8859-15 -*-
10 from i2c import i2c, i2c_write_reg, i2c_read_reg
12 from geometry_msgs.msg import Twist
13 from nav_msgs.msg import Odometry
14 from diagnostic_msgs.msg import DiagnosticArray, DiagnosticStatus, KeyValue
15 from sensor_msgs.msg import Imu, Range
16 from wild_thumper.msg import LedStripe
17 from dynamic_reconfigure.server import Server
18 from wild_thumper.cfg import WildThumperConfig
23 def __init__(self, bus, device, num_leds):
24 self.spi = spidev.SpiDev()
25 self.spi.open(bus, device)
27 self.spi.max_speed_hz=int(2e6)
28 self.num_leds = num_leds
30 self.l = [(0, 0, 0)] * num_leds
33 def set(self, i, red=0, green=0, blue=0):
34 if red > 127 or green > 127 or blue >> 127 or red < 0 or green < 0 or blue < 0:
35 raise Exception("Bad RGB Value")
36 self.l[i] = (red, green, blue)
39 self.spi.writebytes([0x0 for i in range((self.num_leds+31)/32)])
43 for i in range(self.num_leds):
44 red, green, blue = self.l[i]
45 l.append(0x80 | green)
48 self.spi.writebytes(l)
53 rospy.init_node('wild_thumper')
54 prctl.set_name("wild_thumper")
55 enable_odom_tf = rospy.get_param("~enable_odom_tf", True)
57 self.tf_broadcaster = tf.broadcaster.TransformBroadcaster()
59 self.tf_broadcaster = None
60 self.dyn_conf = Server(WildThumperConfig, self.execute_dyn_reconf)
61 self.pub_odom = rospy.Publisher("odom", Odometry, queue_size=16)
62 self.pub_diag = rospy.Publisher("diagnostics", DiagnosticArray, queue_size=16)
63 self.pub_range_fwd = rospy.Publisher("range_forward", Range, queue_size=16)
64 self.pub_range_bwd = rospy.Publisher("range_backward", Range, queue_size=16)
65 self.pub_range_left = rospy.Publisher("range_left", Range, queue_size=16)
66 self.pub_range_right = rospy.Publisher("range_right", Range, queue_size=16)
69 rospy.loginfo("Init done")
70 i2c_write_reg(0x50, 0x90, struct.pack("BB", 1, 1)) # switch direction
71 self.handicap_last = (-1, -1)
72 self.pStripe = LPD8806(1, 0, 12)
73 rospy.Subscriber("cmd_vel_out", Twist, self.cmdVelReceived)
74 rospy.Subscriber("led_stripe", LedStripe, self.led_stripe_received)
75 rospy.Subscriber("imu", Imu, self.imuReceived)
79 rate = rospy.Rate(20.0)
80 sleep(3) # wait 3s for ros to register and establish all subscriber connections before sending reset diag
81 reset_val = self.get_reset()
82 rospy.loginfo("Reset Status: 0x%x" % reset_val)
84 while not rospy.is_shutdown():
85 rospy.logdebug("Loop alive")
86 #print struct.unpack(">B", i2c_read_reg(0x50, 0xA2, 1))[0] # count test
91 self.get_dist_forward()
94 self.get_dist_backward()
97 if self.cmd_vel != None:
98 self.set_speed(self.cmd_vel[0], self.cmd_vel[1])
102 def execute_dyn_reconf(self, config, level):
103 self.bClipRangeSensor = config["range_sensor_clip"]
104 self.range_sensor_max = config["range_sensor_max"]
105 self.odom_covar_xy = config["odom_covar_xy"]
106 self.odom_covar_angle = config["odom_covar_angle"]
107 self.pitch_handicap_enable = config["pitch_handicap_enable"]
108 self.pitch_handicap_limit = config["pitch_handicap_limit"]
109 self.pitch_handicap_strength = 100-config["pitch_handicap_strength"]
111 if not self.pitch_handicap_enable:
112 self.set_motor_handicap(0, 0)
116 def set_motor_handicap(self, front, aft): # percent
117 if front > 100: front = 100
118 if aft > 100: aft = 100
119 if self.handicap_last != (front, aft):
120 i2c_write_reg(0x50, 0x94, struct.pack(">bb", front, aft))
121 self.handicap_last = (front, aft)
123 def imuReceived(self, msg):
124 if self.pitch_handicap_enable:
125 (roll, pitch, yaw) = tf.transformations.euler_from_quaternion(msg.orientation.__getstate__())
126 if pitch > self.pitch_handicap_limit*pi/180:
127 val = (100.0/self.pitch_handicap_strength)*abs(pitch)*180/pi
128 self.set_motor_handicap(int(val), 0)
129 elif pitch < -self.pitch_handicap_limit*pi/180:
130 val = (100.0/self.pitch_handicap_strength)*abs(pitch)*180/pi
131 self.set_motor_handicap(0, int(val))
133 self.set_motor_handicap(0, 0)
136 reset = struct.unpack(">B", i2c_read_reg(0x50, 0xA0, 1))[0]
138 msg = DiagnosticArray()
139 msg.header.stamp = rospy.Time.now()
140 stat = DiagnosticStatus()
141 stat.name = "Reset reason"
142 stat.level = DiagnosticStatus.ERROR if reset & 0x0c else DiagnosticStatus.OK
143 stat.message = "0x%02x" % reset
145 wdrf = bool(reset & (1 << 3))
146 if wdrf: rospy.loginfo("Watchdog Reset")
147 borf = bool(reset & (1 << 2))
148 if borf: rospy.loginfo("Brown-out Reset Flag")
149 extrf = bool(reset & (1 << 1))
150 if extrf: rospy.loginfo("External Reset Flag")
151 porf = bool(reset & (1 << 0))
152 if porf: rospy.loginfo("Power-on Reset Flag")
153 stat.values.append(KeyValue("Watchdog Reset Flag", str(wdrf)))
154 stat.values.append(KeyValue("Brown-out Reset Flag", str(borf)))
155 stat.values.append(KeyValue("External Reset Flag", str(extrf)))
156 stat.values.append(KeyValue("Power-on Reset Flag", str(porf)))
158 msg.status.append(stat)
159 self.pub_diag.publish(msg)
163 def get_motor_err(self):
164 err = struct.unpack(">B", i2c_read_reg(0x50, 0xA1, 1))[0]
166 msg = DiagnosticArray()
167 msg.header.stamp = rospy.Time.now()
168 stat = DiagnosticStatus()
169 stat.name = "Motor: Error Status"
170 stat.level = DiagnosticStatus.ERROR if err else DiagnosticStatus.OK
171 stat.message = "0x%02x" % err
174 stat.values.append(KeyValue("aft left diag", str(bool(err & (1 << 0)))))
175 stat.values.append(KeyValue("front left diag", str(bool(err & (1 << 1)))))
176 stat.values.append(KeyValue("aft right diag", str(bool(err & (1 << 2)))))
177 stat.values.append(KeyValue("front right diag", str(bool(err & (1 << 3)))))
179 stat.values.append(KeyValue("aft left stall", str(bool(err & (1 << 4)))))
180 stat.values.append(KeyValue("front left stall", str(bool(err & (1 << 5)))))
181 stat.values.append(KeyValue("aft right stall", str(bool(err & (1 << 6)))))
182 stat.values.append(KeyValue("front right stall", str(bool(err & (1 << 7)))))
184 msg.status.append(stat)
185 self.pub_diag.publish(msg)
187 def get_voltage(self):
188 volt = struct.unpack(">h", i2c_read_reg(0x52, 0x09, 2))[0]/100.0
190 msg = DiagnosticArray()
191 msg.header.stamp = rospy.Time.now()
192 stat = DiagnosticStatus()
193 stat.name = "Voltage"
194 stat.level = DiagnosticStatus.ERROR if volt < 7 else DiagnosticStatus.OK
195 stat.message = "%.2fV" % volt
197 msg.status.append(stat)
198 self.pub_diag.publish(msg)
202 speed_trans, speed_rot, posx, posy, angle = struct.unpack(">fffff", i2c_read_reg(0x50, 0x38, 20))
203 current_time = rospy.Time.now()
205 # since all odometry is 6DOF we'll need a quaternion created from yaw
206 odom_quat = tf.transformations.quaternion_from_euler(0, 0, angle)
208 # first, we'll publish the transform over tf
209 if self.tf_broadcaster is not None:
210 self.tf_broadcaster.sendTransform((posx, posy, 0.0), odom_quat, current_time, "base_footprint", "odom")
212 # next, we'll publish the odometry message over ROS
214 odom.header.stamp = current_time
215 odom.header.frame_id = "odom"
218 odom.pose.pose.position.x = posx
219 odom.pose.pose.position.y = posy
220 odom.pose.pose.position.z = 0.0
221 odom.pose.pose.orientation.x = odom_quat[0]
222 odom.pose.pose.orientation.y = odom_quat[1]
223 odom.pose.pose.orientation.z = odom_quat[2]
224 odom.pose.pose.orientation.w = odom_quat[3]
225 odom.pose.covariance[0] = self.odom_covar_xy # x
226 odom.pose.covariance[7] = self.odom_covar_xy # y
227 odom.pose.covariance[14] = 99999 # z
228 odom.pose.covariance[21] = 99999 # rotation about X axis
229 odom.pose.covariance[28] = 99999 # rotation about Y axis
230 odom.pose.covariance[35] = self.odom_covar_angle # rotation about Z axis
233 odom.child_frame_id = "base_footprint"
234 odom.twist.twist.linear.x = speed_trans
235 odom.twist.twist.linear.y = 0.0
236 odom.twist.twist.angular.z = speed_rot
237 odom.twist.covariance = odom.pose.covariance
239 # publish the message
240 self.pub_odom.publish(odom)
243 def set_speed(self, trans, rot):
244 i2c_write_reg(0x50, 0x50, struct.pack(">ff", trans, rot))
246 def cmdVelReceived(self, msg):
247 rospy.logdebug("Set new cmd_vel:", msg.linear.x, msg.angular.z)
248 self.cmd_vel = (msg.linear.x, msg.angular.z) # commit speed on next update cycle
249 rospy.logdebug("Set new cmd_vel done")
251 # http://rn-wissen.de/wiki/index.php/Sensorarten#Sharp_GP2D12
252 def get_dist_ir(self, num):
254 s = struct.pack("B", num)
264 val = struct.unpack(">H", s)[0]
267 def start_dist_srf(self, num):
269 s = struct.pack("B", num)
273 def read_dist_srf(self, num):
274 return struct.unpack(">H", i2c_read_reg(0x52, num, 2))[0]/1000.0
276 def send_range(self, pub, frame_id, typ, dist, min_range, max_range, fov_deg):
277 if self.bClipRangeSensor and dist > max_range:
280 msg.header.stamp = rospy.Time.now()
281 msg.header.frame_id = frame_id
282 msg.radiation_type = typ
283 msg.field_of_view = fov_deg*pi/180
284 msg.min_range = min_range
285 msg.max_range = max_range
289 def get_dist_left(self):
290 if self.pub_range_left.get_num_connections() > 0:
291 dist = self.get_dist_ir(0x1)
293 self.send_range(self.pub_range_left, "ir_left", Range.INFRARED, 30.553/(dist - -67.534), 0.04, 0.3, 1)
295 def get_dist_right(self):
296 if self.pub_range_right.get_num_connections() > 0:
297 dist = self.get_dist_ir(0x3)
299 self.send_range(self.pub_range_right, "ir_right", Range.INFRARED, 17.4/(dist - 69), 0.04, 0.3, 1)
301 def get_dist_forward(self):
302 if self.pub_range_fwd.get_num_connections() > 0:
303 dist = self.read_dist_srf(0x15)
304 self.send_range(self.pub_range_fwd, "sonar_forward", Range.ULTRASOUND, dist, 0.04, self.range_sensor_max, 30)
305 self.start_dist_srf(0x5) # get next value
307 def get_dist_backward(self):
308 if self.pub_range_bwd.get_num_connections() > 0:
309 dist = self.read_dist_srf(0x17)
310 self.send_range(self.pub_range_bwd, "sonar_backward", Range.ULTRASOUND, dist, 0.04, self.range_sensor_max, 30)
311 self.start_dist_srf(0x7) # get next value
313 def led_stripe_received(self, msg):
315 self.pStripe.set(led.num, red=led.red, green=led.green, blue=led.blue)
316 self.pStripe.update()
319 if __name__ == "__main__":