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Generic robotic controllers to accompany ros2_control

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#448 applied some fixes to controllers using the generate parameters lib when it was merged. Anything merged after that should also keep track of this. * [ ] #396 *...

good first issue

- Generate parameter library for diff drive - CMake export diff_drive_controller Replacement of https://github.com/ros-controls/ros2_controllers/pull/386 - Squashed @pac48's commits into one from https://github.com/ros-controls/ros2_controllers/pull/386 - Rebased on master - Cleaned up the...

Closes #411 Adds multiplying velocity feedback by wheel radius. When the `position_feedback` option is used, feedback is multiplied by radius (it is expected to be in `rad`). This PR changes...

This PR fixes a segfault in JTC, we were getting a segfault every time we deactivate and then re-activate the controllers. Attaching a debugger to the node shows [read_state_from_hardware(state_desired_)](https://github.com/ros-controls/ros2_controllers/blob/master/joint_trajectory_controller/src/joint_trajectory_controller.cpp#L868) causing...

Do tht following: - [ ] move the file to other repository - [ ] update test code here to use another header file. Move this to the assets' folder...

Can we use here a helper method for sorting reference interfaces out is they exist? The same one I mentioned before that is used in JTC. Maybe we need another...

help wanted
good second issue

**Describe the bug** joint_trajectory_controller::test_trajectory_controller.cpp::PositionTrajectoryControllers/TrajectoryControllerTestParameterized.configure_state_ignores_commands/0 times out when running from commit b157c0d35d42f850dbb48f1d35f91796344c2a5c **To Reproduce** Steps to reproduce the behavior: 1. checkout commit b157c0d35d42f850dbb48f1d35f91796344c2a5c 2. build 3. run all tests in the...

bug

Here is a PR to update ros2_controllers for API change I have in this PR to generate_parameter_library: https://github.com/PickNikRobotics/generate_parameter_library/pull/81

- also change updateController to use sleeps instead of CPU intense while loop refs: #421