universal_robots_ros_driver/src/ur_hardware_interface.cpp

/*
 * ur_hardware_control_loop.cpp
 *
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * <thomas.timm.dk@gmail.com> wrote this file.  As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.   Thomas Timm Andersen
 * ----------------------------------------------------------------------------
 */

/* Based on original source from University of Colorado, Boulder. License copied below. Feel free to offer Dave a beer as well if you meet him. */

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/* Author: Dave Coleman
 Desc:   Example ros_control hardware interface that performs a perfect control loop for simulation
 */

#include <ur_modern_driver/ur_hardware_interface.h>

namespace ros_control_ur {

UrHardwareInterface::UrHardwareInterface(ros::NodeHandle& nh, UrDriver* robot) :
		nh_(nh), robot_(robot) {
	// Initialize shared memory and interfaces here
	init(); // this implementation loads from rosparam

	ROS_INFO_NAMED("ur_hardware_interface", "Loaded ur_hardware_interface.");
}

void UrHardwareInterface::init() {
	ROS_INFO_STREAM_NAMED("ur_hardware_interface",
			"Reading rosparams from namespace: " << nh_.getNamespace());

	// Get joint names
	nh_.getParam("hardware_interface/joints", joint_names_);
	if (joint_names_.size() == 0) {
		ROS_FATAL_STREAM_NAMED("ur_hardware_interface",
				"No joints found on parameter server for controller, did you load the proper yaml file?" << " Namespace: " << nh_.getNamespace());
		exit(-1);
	}
	num_joints_ = joint_names_.size();

	// Resize vectors
	joint_position_.resize(num_joints_);
	joint_velocity_.resize(num_joints_);
	joint_effort_.resize(num_joints_);
	joint_velocity_command_.resize(num_joints_);

	// Initialize controller
	for (std::size_t i = 0; i < num_joints_; ++i) {
		ROS_DEBUG_STREAM_NAMED("ur_hardware_interface",
				"Loading joint name: " << joint_names_[i]);

		// Create joint state interface
		joint_state_interface_.registerHandle(
				hardware_interface::JointStateHandle(joint_names_[i],
						&joint_position_[i], &joint_velocity_[i],
						&joint_effort_[i]));

		// Create velocity joint interface
		velocity_joint_interface_.registerHandle(
				hardware_interface::JointHandle(
						joint_state_interface_.getHandle(joint_names_[i]),
						&joint_velocity_command_[i]));
	}

	// Create joint state interface
	force_torque_interface_.registerHandle(
			hardware_interface::ForceTorqueSensorHandle("wrench", "",
					robot_force_, robot_torque_));

	registerInterface(&joint_state_interface_); // From RobotHW base class.
	registerInterface(&velocity_joint_interface_); // From RobotHW base class.
	registerInterface(&force_torque_interface_); // From RobotHW base class.
}

void UrHardwareInterface::read() {
	std::vector<double> pos, vel, current, tcp;
	pos = robot_->rt_interface_->robot_state_->getQActual();
	vel = robot_->rt_interface_->robot_state_->getQdActual();
	current = robot_->rt_interface_->robot_state_->getIActual();
	tcp = robot_->rt_interface_->robot_state_->getTcpForce();
	for (std::size_t i = 0; i < num_joints_; ++i) {
		joint_position_[i] = pos[i];
		joint_velocity_[i] = vel[i];
		joint_effort_[i] = current[i];
	}
	for (std::size_t i = 0; i < 3; ++i) {
		robot_force_[i] = tcp[i];
		robot_torque_[i] = tcp[i + 3];
	}

}

void UrHardwareInterface::write() {
	robot_->setSpeed(joint_velocity_command_[0],joint_velocity_command_[1],joint_velocity_command_[2],joint_velocity_command_[3],joint_velocity_command_[4],joint_velocity_command_[5],100);
}

} // namespace