cob_simulation_tester.cpp

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#include "ros/ros.h"
#include <kdl/jntarray.hpp>
#include <sensor_msgs/JointState.h>
#include <brics_actuator/JointVelocities.h>
#include <trajectory_msgs/JointTrajectory.h>


using namespace std;
using namespace KDL;

KDL::JntArray VirtualQ;
KDL::JntArray q;

ros::Time last;
bool started = false;

ros::Publisher arm_pub_;  //publish topic arm_controller/command

JntArray parseJointStates(std::vector<std::string> names, std::vector<double> positions)
{
        JntArray q_temp(7);
        int count = 0;
        for(unsigned int i = 0; i < names.size(); i++)
    {
                        if(strncmp(names[i].c_str(), "arm_", 4) == 0)
                        {
                                q_temp(count) = positions[i];
                                count++;
      }
    }
        if(!started)
        {
                VirtualQ = q_temp;
                started = true;
                last = ros::Time::now();

                ROS_INFO("Starting up controller with first configuration");
        }
        return q_temp;
}


void sendVel(JntArray q_dot)
{
        ros::Time now = ros::Time::now();
        double dt = now.toSec() - last.toSec();
        last = now;
        double horizon = 3.0*dt;
        //std::cout << dt << "\n";

        trajectory_msgs::JointTrajectory traj;
        traj.header.stamp = ros::Time::now()+ros::Duration(0.01);
        traj.joint_names.push_back("arm_1_joint");
        traj.joint_names.push_back("arm_2_joint");
        traj.joint_names.push_back("arm_3_joint");
        traj.joint_names.push_back("arm_4_joint");
        traj.joint_names.push_back("arm_5_joint");
        traj.joint_names.push_back("arm_6_joint");
        traj.joint_names.push_back("arm_7_joint");

        traj.points.resize(1);
        bool nonzero = false;
        for(int i = 0; i < 7; i++)
        {
                if(q_dot(i) != 0.0)
                {
                        traj.points[0].positions.push_back(VirtualQ(i) + q_dot(i)*horizon);
                        traj.points[0].velocities.push_back(q_dot(i));
                        VirtualQ(i) += q_dot(i)*dt;
                        nonzero = true;
                }
        }
        traj.points[0].time_from_start = ros::Duration(horizon);
        if(nonzero)
                arm_pub_.publish(traj);
}

void controllerStateCallback(const sensor_msgs::JointState::ConstPtr& msg)
{
        std::vector<std::string> names = msg->name;
        std::vector<double> positions = msg->position;
        q = parseJointStates(names,positions);
}

void velocityCallback(const brics_actuator::JointVelocities::ConstPtr& msg)
{
        KDL::JntArray q_dot;
        q_dot.resize(7);
        for(unsigned int j = 0; j < 7; j++)
        {
                q_dot(j) = msg->velocities.at(j).value;
        }
        sendVel(q_dot);

}


int main(int argc, char **argv)
{
        ros::init(argc, argv, "cob_simulation_tester");
        ros::NodeHandle n;
        arm_pub_ = n.advertise<trajectory_msgs::JointTrajectory>("/arm_controller/command",1);
        ros::Subscriber sub = n.subscribe("/joint_states", 1, controllerStateCallback);
        ros::Subscriber sub_vc = n.subscribe("/arm_controller/command_vel", 1, velocityCallback);
        ros::spin();

        return 0;
}

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cob_trajectory_controller
Author(s): Alexander Bubeck
autogenerated on Fri Jan 11 09:11:45 2013