JoystickDemo.cpp

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#include "JoystickDemo.h"
 
JoystickDemo::JoystickDemo(ros::NodeHandle &node, ros::NodeHandle &priv_nh) : counter_(0)
{
  joy_.axes.resize(AXIS_COUNT_X, 0);
  joy_.buttons.resize(BTN_COUNT_X, 0);
 
  brake_ = true;
  throttle_ = true;
  steer_ = true;
  shift_ = true;
  priv_nh.getParam("brake", brake_);
  priv_nh.getParam("throttle", throttle_);
  priv_nh.getParam("steer", steer_);
  priv_nh.getParam("shift", shift_);
 
  brake_gain_ = 1.0;
  throttle_gain_ = 1.0;
  priv_nh.getParam("brake_gain", brake_gain_);
  priv_nh.getParam("throttle_gain", throttle_gain_);
  brake_gain_    = std::min(std::max(brake_gain_,    (float)0), (float)1);
  throttle_gain_ = std::min(std::max(throttle_gain_, (float)0), (float)1);
 
  ignore_ = false;
  enable_ = true;
  count_ = false;
  strq_ = false;
  svel_ = 0.0;
  last_steering_filt_output_ = 0.0;
  priv_nh.getParam("ignore", ignore_);
  priv_nh.getParam("enable", enable_);
  priv_nh.getParam("count", count_);
  priv_nh.getParam("strq", strq_);
  priv_nh.getParam("svel", svel_);
 
  sub_joy_ = node.subscribe("/joy", 1, &JoystickDemo::recvJoy, this);
 
  data_.brake_joy = 0.0;
  data_.gear_cmd = dbw_polaris_msgs::Gear::NONE;
  data_.steering_joy = 0.0;
  data_.steering_mult = false;
  data_.steering_cal = false;
  data_.throttle_joy = 0.0;
  data_.joy_throttle_valid = false;
  data_.joy_brake_valid = false;
 
  if (brake_) {
    pub_brake_ = node.advertise<dbw_polaris_msgs::BrakeCmd>("brake_cmd", 1);
  }
  if (throttle_) {
    pub_throttle_ = node.advertise<dbw_polaris_msgs::ThrottleCmd>("throttle_cmd", 1);
  }
  if (steer_) {
    pub_steering_ = node.advertise<dbw_polaris_msgs::SteeringCmd>("steering_cmd", 1);
  }
  if (shift_) {
    pub_gear_ = node.advertise<dbw_polaris_msgs::GearCmd>("gear_cmd", 1);
  }
  if (enable_) {
    pub_enable_ = node.advertise<std_msgs::Empty>("enable", 1);
    pub_disable_ = node.advertise<std_msgs::Empty>("disable", 1);
  }
 
  timer_ = node.createTimer(ros::Duration(0.02), &JoystickDemo::cmdCallback, this);
}
 
void JoystickDemo::cmdCallback(const ros::TimerEvent& event)
{
  // Detect joy timeouts and reset
  if (event.current_real - data_.stamp > ros::Duration(0.1)) {
    data_.joy_throttle_valid = false;
    data_.joy_brake_valid = false;
    last_steering_filt_output_ = 0.0;
    return;
  }
 
  // Optional watchdog counter
  if (count_) {
    counter_++;
  }
 
  // Brake
  if (brake_) {
    dbw_polaris_msgs::BrakeCmd msg;
    msg.enable = true;
    msg.ignore = ignore_;
    msg.count = counter_;
    msg.pedal_cmd_type = dbw_polaris_msgs::BrakeCmd::CMD_PERCENT;
    msg.pedal_cmd = data_.brake_joy * brake_gain_;
    pub_brake_.publish(msg);
  }
 
  // Throttle
  if (throttle_) {
    dbw_polaris_msgs::ThrottleCmd msg;
    msg.enable = true;
    msg.ignore = ignore_;
    msg.count = counter_;
    msg.pedal_cmd_type = dbw_polaris_msgs::ThrottleCmd::CMD_PERCENT;
    msg.pedal_cmd = data_.throttle_joy * throttle_gain_;
    pub_throttle_.publish(msg);
  }
 
  // Steering
  if (steer_) {
    dbw_polaris_msgs::SteeringCmd msg;
    msg.enable = true;
    msg.ignore = ignore_;
    msg.count = counter_;
    msg.calibrate = data_.steering_cal;
    if (!strq_) {
      msg.cmd_type = dbw_polaris_msgs::SteeringCmd::CMD_ANGLE;
 
      float raw_steering_cmd;
      if (data_.steering_mult) {
        raw_steering_cmd = dbw_polaris_msgs::SteeringCmd::ANGLE_MAX * data_.steering_joy;
      } else {
        raw_steering_cmd = 0.5 * dbw_polaris_msgs::SteeringCmd::ANGLE_MAX * data_.steering_joy;
      }
 
      float tau = 0.1;
      float filtered_steering_cmd = 0.02 / tau * raw_steering_cmd + (1 - 0.02 / tau) * last_steering_filt_output_;
      last_steering_filt_output_ = filtered_steering_cmd;
 
      msg.steering_wheel_angle_velocity = svel_;
      msg.steering_wheel_angle_cmd = filtered_steering_cmd;
    } else {
      msg.cmd_type = dbw_polaris_msgs::SteeringCmd::CMD_TORQUE;
      msg.steering_wheel_torque_cmd = dbw_polaris_msgs::SteeringCmd::TORQUE_MAX * data_.steering_joy;
    }
    pub_steering_.publish(msg);
  }
 
  // Gear
  if (shift_) {
    if (data_.gear_cmd != dbw_polaris_msgs::Gear::NONE) {
      dbw_polaris_msgs::GearCmd msg;
      msg.cmd.gear = data_.gear_cmd;
      pub_gear_.publish(msg);
    }
  }
}
 
void JoystickDemo::recvJoy(const sensor_msgs::Joy::ConstPtr& msg)
{
  // Check for expected sizes
  if (msg->axes.size() != (size_t)AXIS_COUNT_X && msg->buttons.size() != (size_t)BTN_COUNT_X) {
    if (msg->axes.size() == (size_t)AXIS_COUNT_D && msg->buttons.size() == (size_t)BTN_COUNT_D) {
      ROS_ERROR_THROTTLE(2.0, "Detected Logitech Gamepad F310 in DirectInput (D) mode. Please select (X) with the switch on the back to select XInput mode.");
    }
    if (msg->axes.size() != (size_t)AXIS_COUNT_X) {
      ROS_ERROR_THROTTLE(2.0, "Expected %zu joy axis count, received %zu", (size_t)AXIS_COUNT_X, msg->axes.size());
    }
    if (msg->buttons.size() != (size_t)BTN_COUNT_X) {
      ROS_ERROR_THROTTLE(2.0, "Expected %zu joy button count, received %zu", (size_t)BTN_COUNT_X, msg->buttons.size());
    }
    return;
  }
 
  // Handle joystick startup
  if (msg->axes[AXIS_THROTTLE] != 0.0) {
    data_.joy_throttle_valid = true;
  }
  if (msg->axes[AXIS_BRAKE] != 0.0) {
    data_.joy_brake_valid = true;
  }
 
  // Throttle
  if (data_.joy_throttle_valid) {
    data_.throttle_joy = 0.5 - 0.5 * msg->axes[AXIS_THROTTLE];
  }
 
  // Brake
  if (data_.joy_brake_valid) {
    data_.brake_joy = 0.5 - 0.5 * msg->axes[AXIS_BRAKE];
  }
 
  // Gear
  if (msg->buttons[BTN_PARK]) {
    data_.gear_cmd = dbw_polaris_msgs::Gear::PARK;
  } else if (msg->buttons[BTN_REVERSE]) {
    data_.gear_cmd = dbw_polaris_msgs::Gear::REVERSE;
  } else if (msg->buttons[BTN_DRIVE]) {
    data_.gear_cmd = dbw_polaris_msgs::Gear::DRIVE;
  } else if (msg->buttons[BTN_NEUTRAL]) {
    data_.gear_cmd = dbw_polaris_msgs::Gear::NEUTRAL;
  } else {
    data_.gear_cmd = dbw_polaris_msgs::Gear::NONE;
  }
 
  // Steering
  data_.steering_joy = (fabs(msg->axes[AXIS_STEER_1]) > fabs(msg->axes[AXIS_STEER_2])) ? msg->axes[AXIS_STEER_1] : msg->axes[AXIS_STEER_2];
  data_.steering_mult = msg->buttons[BTN_STEER_MULT_1] || msg->buttons[BTN_STEER_MULT_2];
  data_.steering_cal =  msg->buttons[BTN_STEER_MULT_1] && msg->buttons[BTN_STEER_MULT_2];
 
  // Optional enable and disable buttons
  if (enable_) {
    if (msg->buttons[BTN_ENABLE]) {
      pub_enable_.publish(std_msgs::Empty());
    }
    if (msg->buttons[BTN_DISABLE]) {
      pub_disable_.publish(std_msgs::Empty());
    }
  }
 
  data_.stamp = ros::Time::now();
  joy_ = *msg;
}