sunnypilot/tools/joystick/joystickd.py

#!/usr/bin/env python
import argparse

import cereal.messaging as messaging
from common.numpy_fast import interp, clip
from common.params import Params
from inputs import get_gamepad
from tools.lib.kbhit import KBHit


class Keyboard:
  def __init__(self):
    self.kb = KBHit()
    self.axis_increment = 0.05  # 5% of full actuation each key press
    self.axes_map = {'w': 'gb', 's': 'gb',
                     'a': 'steer', 'd': 'steer'}
    self.axes_values = {'gb': 0., 'steer': 0.}

  def update(self):
    key = self.kb.getch().lower()
    self.cancel = False
    if key == 'r':
      self.axes_values = {ax: 0. for ax in self.axes_values}
    elif key == 'c':
      self.cancel = True
    elif key in self.axes_map:
      axis = self.axes_map[key]
      incr = self.axis_increment if key in ['w', 'a'] else -self.axis_increment
      self.axes_values[axis] = clip(self.axes_values[axis] + incr, -1, 1)
    else:
      return False
    return True


class Joystick:
  def __init__(self):
    self.max_axis_value = 255  # tune based on your joystick, 0 to this
    self.cancel_button = 'BTN_TRIGGER'
    self.axes_values = {'ABS_Y': 0., 'ABS_RZ': 0.}  # gb, steer

  def update(self):
    joystick_event = get_gamepad()[0]
    event = (joystick_event.code, joystick_event.state)
    self.cancel = False
    if event[0] == self.cancel_button and event[1] == 0:  # state 0 is falling edge
      self.cancel = True
    elif event[0] in self.axes_values:
      norm = -interp(event[1], [0, self.max_axis_value], [-1., 1.])
      self.axes_values[event[0]] = norm if abs(norm) > 0.05 else 0.  # center can be noisy, deadzone of 5%
    else:
      return False
    return True


def joystick_thread(use_keyboard):
  Params().put_bool('JoystickDebugMode', True)
  joystick_sock = messaging.pub_sock('testJoystick')
  joystick = Keyboard() if use_keyboard else Joystick()

  while True:
    ret = joystick.update()  # processes joystick/key events and handles state of axes
    if ret:
      dat = messaging.new_message('testJoystick')
      dat.testJoystick.axes = [joystick.axes_values[a] for a in joystick.axes_values]
      dat.testJoystick.buttons = [joystick.cancel]
      joystick_sock.send(dat.to_bytes())
      print('\n' + ', '.join([f'{name}: {round(v, 3)}' for name, v in joystick.axes_values.items()]))


if __name__ == '__main__':
  parser = argparse.ArgumentParser(
    description='Publishes events from your joystick to control your car',
    formatter_class=argparse.ArgumentDefaultsHelpFormatter)
  parser.add_argument('--keyboard', action='store_true', help='Use your keyboard instead of a joystick')
  args = parser.parse_args()

  if args.keyboard:
    print('\nGas/brake control: `W` and `S` keys\n'
          'Steering control: `A` and `D` keys')
    print('Buttons:\n'
          '- `R`: Resets axes\n'
          '- `C`: Cancel cruise control')
  else:
    print('\nUsing joystick, make sure to run bridge on your device if running over the network!')

  joystick_thread(args.keyboard)