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teleop_twist_keyboard.py
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teleop_twist_keyboard.py
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import sys
import threading
import geometry_msgs.msg
import rclpy
from rclpy.qos import QoSProfile, ReliabilityPolicy, HistoryPolicy, DurabilityPolicy
if sys.platform == 'win32':
import msvcrt
else:
import termios
import tty
msg = """
This node takes keypresses from the keyboard and publishes them
as Twist/TwistStamped messages. It works best with a US keyboard layout.
---------------------------
Moving around:
u i o
j k l
m , .
For Holonomic mode (strafing), hold down the shift key:
---------------------------
U I O
J K L
M < >
t : up (+z)
b : down (-z)
anything else : stop
q/z : increase/decrease max speeds by 10%
w/x : increase/decrease only linear speed by 10%
e/c : increase/decrease only angular speed by 10%
CTRL-C to quit
"""
moveBindings = {
'i': (1, 0, 0, 0),
'o': (0, 0, 0, -1),
'j': (0, 1, 0, 0),
'l': (0,-1, 0, 0),
'u': (0, 0, 0, 1),
'k': (-1, 0, 0, 0),
'.': (-1, 0, 0, 1),
'm': (-1, 0, 0, -1),
'O': (1, -1, 0, 0),
'I': (1, 0, 0, 0),
'J': (0, 1, 0, 0),
'L': (0, -1, 0, 0),
'U': (1, 1, 0, 0),
'<': (-1, 0, 0, 0),
'>': (-1, -1, 0, 0),
'M': (-1, 1, 0, 0),
't': (0, 0, 1, 0),
'b': (0, 0, -1, 0),
}
speedBindings = {
'q': (1.1, 1.1),
'z': (.9, .9),
'w': (1.1, 1),
'x': (.9, 1),
'e': (1, 1.1),
'c': (1, .9),
}
def getKey(settings):
if sys.platform == 'win32':
# getwch() returns a string on Windows
key = msvcrt.getwch()
else:
tty.setraw(sys.stdin.fileno())
# sys.stdin.read() returns a string on Linux
key = sys.stdin.read(1)
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, settings)
return key
def saveTerminalSettings():
if sys.platform == 'win32':
return None
return termios.tcgetattr(sys.stdin)
def restoreTerminalSettings(old_settings):
if sys.platform == 'win32':
return
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)
def vels(speed, turn):
return 'currently:\tspeed %s\tturn %s ' % (speed, turn)
def main():
settings = saveTerminalSettings()
rclpy.init()
node = rclpy.create_node('teleop_twist_keyboard')
# parameters
qos_profile = QoSProfile(
reliability=ReliabilityPolicy.BEST_EFFORT,
history=HistoryPolicy.KEEP_LAST,
durability=DurabilityPolicy.TRANSIENT_LOCAL,
depth=1
)
stamped = node.declare_parameter('stamped', False).value
frame_id = node.declare_parameter('frame_id', '').value
if not stamped and frame_id:
raise Exception("'frame_id' can only be set when 'stamped' is True")
if stamped:
TwistMsg = geometry_msgs.msg.TwistStamped
else:
TwistMsg = geometry_msgs.msg.Twist
pub = node.create_publisher(TwistMsg, 'cmd_vel', qos_profile)
spinner = threading.Thread(target=rclpy.spin, args=(node,))
spinner.start()
speed = 0.5
turn = 1.0
x = 0.0
y = 0.0
z = 0.0
th = 0.0
status = 0.0
twist_msg = TwistMsg()
if stamped:
twist = twist_msg.twist
twist_msg.header.stamp = node.get_clock().now().to_msg()
twist_msg.header.frame_id = frame_id
else:
twist = twist_msg
try:
print(msg)
print(vels(speed, turn))
while True:
key = getKey(settings)
if key in moveBindings.keys():
x = moveBindings[key][0]
y = moveBindings[key][1]
z = moveBindings[key][2]
th = moveBindings[key][3]
elif key in speedBindings.keys():
speed = speed * speedBindings[key][0]
turn = turn * speedBindings[key][1]
print(vels(speed, turn))
if (status == 14):
print(msg)
status = (status + 1) % 15
else:
x = 0.0
y = 0.0
z = 0.0
th = 0.0
if (key == '\x03'):
break
if stamped:
twist_msg.header.stamp = node.get_clock().now().to_msg()
twist.linear.x = x * speed
twist.linear.y = y * speed
twist.linear.z = z * speed
twist.angular.x = 0.0
twist.angular.y = 0.0
twist.angular.z = th * turn
pub.publish(twist_msg)
except Exception as e:
print(e)
finally:
if stamped:
twist_msg.header.stamp = node.get_clock().now().to_msg()
twist.linear.x = 0.0
twist.linear.y = 0.0
twist.linear.z = 0.0
twist.angular.x = 0.0
twist.angular.y = 0.0
twist.angular.z = 0.0
pub.publish(twist_msg)
rclpy.shutdown()
spinner.join()
restoreTerminalSettings(settings)
if __name__ == '__main__':
main()