adi_tmcl

adi_tmcl (previously tmcl_ros) is the official ROS Driver for ADI Trinamic Motor Controllers (TMC) that uses Trinamic Motion Control Language (TMCL) protocol.

Background

• Supported TMC boards: TMCM-1636, TMCM-1617, TMCM-2611, TMCM-1241, TMCM-1260, TMCM-6214
• Supported communication interface and interface driver: CAN (SocketCAN)
• Supported ROS and OS distro: Noetic (Ubuntu 20.04)
• Supported platform: Intel x86 64-bit (amd64)
• Supported setup: Single/Multiple TMC in Single/Multiple CAN channel (namespace-managed)

:memo: Note: Although officially supported TMC boards are only the abovementioned, all market-ready TMCs with YAMLs in this repository are also expected to work and can be tried and tested by the users. Contact the Developers for any issues encountered.

Hardware

For the tested TMCM-1636 setup, the following are used:

• 1 x TMCM-1636
• 1 x QBL4208-61-04-013 BLDC motor
• 1 x External 24V power supply
• 1 x CAN USB Cable (w/SocketCAN support) - with 120 ohm termination resistors

Also the following:

• PWR/GND from board to external 24V power supply
• 5-pin Motor connector (Hall) (see Note below)
• 5-pin Motor connector (Encoder) (see Note below)
• 40 pin Molex connectors

:memo: Note: Check Section 4 of QBL4208-x-1k Datasheet for motor wiring references.

The image below shows the connection diagram of the setup (with labels):

The image below shows the actual setup used (for reference):

Software

Software Architecture

Software Dependencies

Assumptions before building this package:

• Installed ROS Noetic. If not, follow these steps.
• Setup catkin workspace (with workspace folder named as “catkin_ws”). If not, follow these steps.

Clone

In the website:

1. Make sure that the branch dropdown is set to “noetic”.
2. Click the “Clone” or “Code” button, then copy the SSH or HTTPS link (eg, “*.git”).

In a terminal, do the following:

$ cd ~/catkin_ws/src
# Clone to directory "adi_tmcl" which is the package name
$ git clone <copied SSH o HTTPS link here> adi_tmcl

Build

Do proper exports first:

$ source /opt/ros/<ROS version>/setup.bash

Where:

• “ROS version” is the user’s actual ROS version

Then:

$ cd ~/catkin_ws/
$ catkin_make clean
$ catkin_make
$ source devel/setup.bash

Pre-Launch (One-time per setup)

If it’s the first time to use the set of motors for the TMC that you are using, it is required to calibrate and tune the PID settings of the motors first.

Do the calibrations/tuning by downloading and using TMCL-IDE.

BLDC Motors

Calibrate the motors

For a run-through/tutorial of how the calibration is done in the TMCL-IDE via its Wizard Pool feature, check this link.

Tune the PI settings of the motors

For a run-through/tutorial of how the PI tuning is done in the TMCL-IDE via its PI Tuning feature, check this link.

:memo: Note: For all the calibration and tuning done, store all the parameters set from TMCL_IDE on the board’s EEPROM. Do this by doing any of the following:

• Clicking the “Store Parameter” under Settings of each axis
• Using STAP (Store Axis Parameters) command from Direct Mode
• Creating and uploading a TMCL Program, and enabling the “auto start mode” under SGP (Set Global Parameter) command from Direct Mode
• • :memo: Note: Some boards don’t have “auto start mode”, so in such a case, use the other options to store the parameters.

Stepper Motors

Calibrate the motors

For a run-through/tutorial of how the calibration is done in the TMCL-IDE via its Wizard Pool feature, check this link.

For more information about Trinamic features on stepper motors, visit this link.

:memo: Note: For all the calibration and tuning done, store all the parameters set from TMCL_IDE on the board’s EEPROM. Do this by:

• Creating and uploading a TMCL Program, and enabling the “auto start mode” under SGP (Set Global Parameter) command from Direct Mode

Pre-Launch (One-time)

Initialize CAN

:memo: Note: This script automatically brings-up CAN upon boot. Do this step only once.

To proceed, first make the script executable (do this only once as this change persists even after power-off):

$ cd ~/catkin_ws/src/adi_tmcl/scripts # or $ cd ~/catkin_ws/src/<repo directory>/scripts
$ chmod +x CAN_init.sh

Execute the script:

$ sudo ./CAN_init.sh <communication interface> <bitrate>

Where:

• communication interface is the interface used between the PC and the TMC (accepted values: 0 -255)
• bitrate is the rate of communication interface (accepted values: 20000, 50000, 100000, 125000, 250000, 500000, 1000000)

:memo: Note: The above mentioned accepted values are a range, though the user still needs to check the actual TMC’s datasheet on the applicable range. Additionally, the bitrate set here must be the same bitrate set into the the TMC as the Global Parameter “CAN bit rate”.

For example, to initialize CAN with can0 as communication interface and 1000KBPS bitrate:

$ sudo ./CAN_init.sh 0 1000000

De-initialize CAN

:memo: Note: This script disables the automatic bring-up of CAN upon boot.

To proceed, first make the script executable (do this only once as this change persists even after power-off):

$ cd ~/catkin_ws/src/adi_tmcl/scripts # or $ cd ~/catkin_ws/src/<repo directory>/scripts
$ chmod +x CAN_deinit.sh

Execute the script:

$ sudo ./CAN_deinit.sh <communication interface>

Where:

• communication interface is the interface used between the PC and the TMC (accepted values: 0 -255)

For example, to de-initialize CAN with can0 as communication interface:

$ sudo ./CAN_deinit.sh 0

Launch

$ roslaunch adi_tmcl tmcm_1636.launch

Nodes

tmcl_ros_node

:memo: _Note: For those with in the topic names, these are ideally the motor number. For example, if there are 2 motors used, there should be two published topics for tmc_info, specifically /tmc_info_0 for motor 0 and then /tmc_info_1 for motor 1._

Published topics

These are the default topic names, topic names can be modified as a ROS parameter.

• **/tmc_info_**
  • Data containing:
    • (1) board voltage (V)
    • (2) statusflag value (only for boards with StatusFlags AP, else, value is set to 0)
    • (3) statusflag notifications (only for boards with StatusFlags AP and StatusFlags Register names). In the case of Stepper motor(s), this publishes driver error flags and extended error flags values. Else, value is set to “ “)
    • (4) motor number
    • (5) velocity (if Parameter wheel_diameter is set to 0, the unit for published velocity is rpm, else m/s)
    • (6) position (degree angle)
    • (7) torque (mA)

Subscriber topics

• **/cmd_vel_**
  • Velocity command (rpm or m/s)
• **/cmd_abspos_**
  • Absolute position command (degree angle)
• **/cmd_relpos_**
  • Relative position command (degree angle)
• **/cmd_trq_**
  • Torque command (mA)

Advertised services

• /tmcl_custom_cmd (/tmcl_custom_cmd)
  • Executes a custom SAP, GAP, SGP and GGP commands
  • The output contains raw data (velocity = rpm, position = units) from the board. Do not expect same unit from the publisher.
• /tmcl_gap_all (/tmcl_gap_all)
  • Get all Axis Parameter values
• /tmcl_ggp_all (/tmcl_ggp_all)
  • Get all Global Parameter values

Parameters

:memo: Notes:

• If any of these parameters are not set/declared, default values will be used.
• ROS parameters can only cover rosparam get. rosparam set is prohibited, even when the user run rosparam set, only the parameter from server will change but not in the node itself

Communication Interface Parameters

• comm_interface (int, default: 0)
  • Interface used between the PC and the TMC (where 0 = CAN)
• comm_interface_name (string, default: can0)
  • Name of the interface or device as detected by the PC
• comm_tx_id (int, default: 1)
  • ID for board TX
• comm_rx_id (int, default: 2)
  • ID for board RX

TMC ROS Node Parameters

• comm_timeout_ms (int, default: 100)
  • Indicates how long should the node will wait for the rx data
• comm_exec_cmd_retries (int, default: 1)
  • Indicates how many the node will retry sending data before shutting down if no data received
• adhoc_mode (bool, default: false)
  • This mode expects that the used module is not known. The velocity, position and torque relies on the additional_ratio_* values.
• en_motors (int, default: 0)
  • Enables/disables active motors or axes. If disabled, settings for those motors will be ignored or not set.
• pub_rate_tmc_info (int, default: 10)
  • Publish rate (hertz) of TMC information
• auto_start_additional_delay (int, default: 0)
  • Added delay if auto start mode is enabled. Use this if your TMCL program needs to start running after over 2 seconds.

Motor Configuration Settings

• en_pub_tmc_info (bool, default: false)
  • Enables/disables publishing of TMC information
• pub_actual_vel (bool, default: false)
  • Enable/Disable actual velocity that the user can optionally publish every publish rate as long as en_pub_tmc_info is true
• pub_actual_trq (bool, default: false)
  • Enable/Disable actual torque that the user can optionally publish every publish rate as long as en_pub_tmc_info is true
• pub_actual_pos (bool, default: false)
  • Enable/Disable actual position that the user can optionally publish every publish rate as long as en_pub_tmc_info is true
• tmc_info_topic (string, default: /tmc_info_)
  • tmc_info topics that will contain chosen TMC info that will be published
• tmc_cmd_vel_topic (string, default: /cmd_vel_)
  • Twist topics that will be the source of target velocity to be set on the TMC
• tmc_cmd_abspos_topic (string, default: /cmd_abspos_)
  • Int32 topics that will be the source of target position to be set on the TMC
• tmc_cmd_relpos_topic (string, default: /cmd_relpos_)
  • Int32 topics that will be the source of target position to be set on the TMC
• tmc_cmd_trq_topic (string, default: /cmd_trq_)
  • Int32 topics that will be the source of target torque to be set on the TMC
• wheel_diameter (int, default: 0)
  • Wheel diameter that is attached on the motor shaft directly. This is to convert linear values to rpm
  • If wheel diameter is 0, cmd_vel is equal to rpm
• additional_ratio_vel (int, default: 1)
  • Additional Ratio for velocity for general purposes (adhoc mode, added pulley or gear trains). Default value 1 means disabled
• additional_ratio_pos (int, default: 1)
  • Additional Ratio for position for general purposes (adhoc mode, added pulley or gear trains). Default value 1 means disabled
• additional_ratio_trq (int, default: 1)
  • Additional Ratio for torque for general purposes (adhoc mode). Default value 1 means disabled

Quick Tests

Test Velocity Mode

To do a quick test of Velocity Mode, there is a fake velocity script that the user can run. Idea is, this script will send Velocity commands (as a ROS topic), then the first motor should be expected to:

1. Increase velocity every 3secs, clockwise (in m/s: 3, 6, 9)
2. Stop for 5secs
3. Increase velocity every 3secs, counter-clockwise (in m/s: -3, -6, -9)
4. Stop for 5secs

To proceed with the test, execute these following commands on three (3) different terminals (in sequence):

:memo: Note: Assuming that Initialize CAN is already done on Terminal 1.

Monitor the velocity of the first motor (watch out for velocity value at Terminal 2).

:memo: Notes:

• Terminals 2 and 3 are best viewed side-by-side.
• You may Ctrl-C the command in Terminal 2 once you’re done.
• The command in Terminal 3 auto-stops by itself.

Test Position Mode

To do a quick test of Position Mode, there is a fake position script that the user can run. Idea is, this script will send Position commands (as a ROS topic), then the first motor should be expected to:

1. Rotate 360 degrees (clockwise) every 5 secs, 3 times
2. Stop for 5secs
3. Rotate 360 degrees (counter-clockwise) every 5 secs, 3 times
4. Stop for 5secs

To proceed with the test, execute these following commands on three (3) different terminals (in sequence):

:memo: Note: Assuming that Initialize CAN is already done on Terminal 1.

Monitor the position of the first motor (watch out for position value at Terminal 2).

:memo: Notes:

• Terminals 2 and 3 are best viewed side-by-side.
• You may Ctrl-C the command in Terminal 2 once you’re done.
• The command in Terminal 3 auto-stops by itself.

Test Torque Mode

To do a quick test of Torque Mode, there is a fake torque script that the user can run. Idea is, this script will send Torque commands (as a ROS topic), then the first motor should be expected to:

1. Rotate for 5 secs, with torque = 300
2. Stop for 5secs
3. Rotate for 5 secs again, with torque = 300

To proceed with the test, execute these following commands on three (3) different terminals (in sequence):

:memo: Note: Assuming that Initialize CAN is already done on Terminal 1.

Monitor the torque of the first motor (watch out for torque value at Terminal 2).

:memo: Notes:

• Terminals 2 and 3 are best viewed side-by-side.
• You may Ctrl-C the command in Terminal 2 once you’re done.
• The command in Terminal 3 auto-stops by itself.

Limitations

1. No support for interfaces other than CAN yet.

Support

Please contact the Maintainers if you want to use this ROS Driver on Trinamic Motor Controllers without YAML files in this repository.

Any other inquiries and support are also welcome.