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teleop_key.cpp
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teleop_key.cpp
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#include <ros/ros.h>
#include <geometry_msgs/Twist.h>
#include <signal.h>
#include <termios.h>
#include <stdio.h>
#define KEYCODE_R 0x64
#define KEYCODE_L 0x61
#define KEYCODE_U 0x77
#define KEYCODE_D 0x73
#define KEYCODE_Q 0x71
class TeleopTurtle
{
public:
TeleopTurtle();
void keyLoop();
private:
ros::NodeHandle nh_;
double linear_, angular_, l_scale_, a_scale_;
ros::Publisher vel_pub_;
};
TeleopTurtle::TeleopTurtle():
linear_(0),
angular_(0),
l_scale_(100.0),
a_scale_(1.0)
{
nh_.param("scale_angular", a_scale_, a_scale_);
nh_.param("scale_linear", l_scale_, l_scale_);
vel_pub_ = nh_.advertise<geometry_msgs::Twist>("/cmd_vel", 1);
}
int kfd = 0;
struct termios cooked, raw;
void quit(int sig)
{
tcsetattr(kfd, TCSANOW, &cooked);
ros::shutdown();
exit(0);
}
int main(int argc, char** argv)
{
ros::init(argc, argv, "teleop_key");
TeleopTurtle teleop_turtle;
signal(SIGINT,quit);
teleop_turtle.keyLoop();
return(0);
}
void TeleopTurtle::keyLoop()
{
char c;
bool dirty=false;
// get the console in raw mode
tcgetattr(kfd, &cooked);
memcpy(&raw, &cooked, sizeof(struct termios));
raw.c_lflag &=~ (ICANON | ECHO);
// Setting a new line, then end of file
raw.c_cc[VEOL] = 1;
raw.c_cc[VEOF] = 2;
tcsetattr(kfd, TCSANOW, &raw);
puts("Reading from keyboard");
puts("---------------------------");
puts("Use arrow keys to move the turtle.");
for(;;)
{
// get the next event from the keyboard
if(read(kfd, &c, 1) < 0)
{
perror("read():");
exit(-1);
}
linear_=angular_=0;
ROS_DEBUG("value: 0x%02X\n", c);
switch(c)
{
case KEYCODE_L:
ROS_DEBUG("LEFT");
angular_ = 1.0;
linear_ = 1.0;
dirty = true;
break;
case KEYCODE_R:
ROS_DEBUG("RIGHT");
angular_ = -1.0;
linear_ = 1.0;
dirty = true;
break;
case KEYCODE_U:
ROS_DEBUG("UP");
linear_ = 1.0;
angular_ = 32768;
dirty = true;
break;
case KEYCODE_D:
ROS_DEBUG("DOWN");
linear_ = -1.0;
angular_ = 32768;
dirty = true;
break;
case KEYCODE_Q:
ROS_DEBUG("STOP");
linear_ = 0;
angular_ = 0;
dirty = true;
break;
}
geometry_msgs::Twist twist;
twist.angular.z = a_scale_*angular_;
twist.linear.x = l_scale_*linear_;
if(dirty ==true)
{
vel_pub_.publish(twist);
dirty=false;
}
}
return;
}