![]() ![]() If the device doesn't work on the other PC, you might need to replace it. If the device doesn't appear to work at all (no lights appear on the device when it’s plugged in, or the cursor doesn't move or doesn't appear on the screen), connect the device to another PC and make sure the device works on that PC. If your wireless device uses a Bluetooth connection, also see Fix Bluetooth problems in Windows for possible solutions. The wireless connection should be reestablished. There might also be a Reset button on the USB receiver for your device.įor USB wireless devices, this might be as simple as unplugging the USB wireless receiver, waiting for about 10 seconds, and then plugging the USB wireless receiver back into the USB port. Resetting the device will disconnect and then reconnect the wireless connection. Look on the bottom of the wireless device for a Reset button. Make sure there’s no dirt blocking keys or sensors. Make sure that the cables on your device aren't damaged in any way.Ĭheck any battery-powered devices to see if they are fully charged or have fresh batteries. If it’s still not working, try removing the USB hub and plugging the device directly into a USB port on the PC. If you use a USB hub between the device and the PC, make sure the hub has power. Try using a different USB port on your PC. Unplug USB cables and wait for a little while for the device driver to be unloaded by Windows, and then plug the device back in. Having trouble with a device? Make sure everything is connected properly, the device has power, and that it’s set up correctly. If you require an example code visit here: keyboard_non_blocking_input_node.Note: For issues with touchpads, see Fix touchpad problems in Windows. If (tcsetattr(filedesc, TCSADRAIN, &old) < 0) If (tcsetattr(filedesc, TCSANOW, &old) < 0) Rv = select(filedesc + 1, &set, NULL, NULL, &timeout) filedesc is 0 for taking input from keyboard, most probably it's similar to stdin but not sure. You can change the _sec, _sec to change the time to wait for user input. In the above answers the getchar() function blocks the ros's while loop, If you want the loop to run at a particular rate and to get inputs when it's available replace the getch() function definition with the below. ![]() Int c = getch() // call your non-blocking input function Once you've got that function written, you can do something like: while (ros::ok()) Tcsetattr( STDIN_FILENO, TCSANOW, &oldt) // restore old settings Int c = getchar() // read character (non-blocking) Tcsetattr( STDIN_FILENO, TCSANOW, &newt) // apply new settings ![]() Newt.c_lflag &= ~(ICANON) // disable buffering Tower of Hanoi problem, where is particularly solved the inverse. Tcgetattr( STDIN_FILENO, &oldt) // save old settings This paper presents some of the capabilities ofWebots-a robotics simulation software. Basically, you need something like: int getch() You'll want to make sure and restore the original settings when your program exits, or else the terminal will behave oddly. It boils down to modifying the terminal settings to disable input buffering. See this thread for suggestions on how to implement a non-blocking getchar() in linux. So, you'll need to use some sort of OS-specific hack to read the keys as they are pressed. Which is probably not the behavior you want. This node is used in the Understanding Topics tutorial.Īll the default built-in functions ( cin >, getchar, etc.) block until the user presses "enter". You can look at the method used in the turtlesim teleop_turtle_key. As far as I know, there's no ROS (or Boost) built-in function for this. ![]()
0 Comments
Leave a Reply. |