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kinematics: Generic Cartesian kinematics implementation (#6815)
* tests: Added a regression test for generic_cartesian kinematics * kinematics: An intial implementation of generic_cartesian kinematics * generic_cartesian: Refactored kinematics configuration API * generic_cartesian: Use stepper instead of kinematic_stepper in configs * generic_cartesian: Added SET_STEPPER_KINEMATICS command * generic_cartesian: Fixed parsing of section names * docs: Generic Caretsian kinematics documentation and config samples * generic_cartesian: Implemented multi-mcu homing validation * generic_cartesian: Fixed typos in docs, minor fixes * generic_cartesian: Renamed `kinematics` option to `carriages` * generic_cartesian: Moved kinematic_stepper.py file * idex_modes: Internal refactoring of handling dual carriages * stepper: Refactored the code to not store a reference to config object * config: Updated example-generic-cartesian config * generic_cartesian: Restricted SET_STEPPER_CARRIAGES and exported status * idex_modes: Fixed handling stepper kinematics with input shaper enabled * config: Updated configs and tests for SET_DUAL_CARRIAGE new params * generic_cartesian: Avoid inheritance in the added classes Signed-off-by: Dmitry Butyugin <dmbutyugin@google.com>
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@ -84,8 +84,9 @@ The printer section controls high level printer settings.
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[printer]
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kinematics:
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# The type of printer in use. This option may be one of: cartesian,
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# corexy, corexz, hybrid_corexy, hybrid_corexz, rotary_delta, delta,
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# deltesian, polar, winch, or none. This parameter must be specified.
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# corexy, corexz, hybrid_corexy, hybrid_corexz, generic_cartesian,
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# rotary_delta, delta, deltesian, polar, winch, or none.
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# This parameter must be specified.
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max_velocity:
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# Maximum velocity (in mm/s) of the toolhead (relative to the
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# print). This value may be changed at runtime using the
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@ -712,6 +713,172 @@ anchor_z:
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# These parameters must be provided.
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```
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### Generic Cartesian Kinematics
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See [example-generic-cartesian.cfg](../config/example-generic-caretesian.cfg)
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for an example generic Cartesian kinematics config file.
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This printer kinematic class allows a user to define in a pretty flexible
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manner an arbitrary Cartesian-style kinematics. In principle, the regular
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cartesian, corexy, hybrid_corexy can be defined this way too. However,
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more importantly, various otherwise unsupported kinematics such as
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inverted hybrid_corexy or corexyuv can be defined using this kinematic.
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Notably, the definition of a generic Cartesian kinematic deviates
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significantly from the other kinematic types. It follows the following
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convention: a user defines a set of carriages with certain range of motion
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that can move independently from each other (they should move over the
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Cartesian axes X, Y, and Z, hence the name of the kinematic) and
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corresponding endstops that allow the firmware to determine the position
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of carriages during homing, as well as a set of steppers that move those
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carriages. The `[printer]` section must specify the kinematic and
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other printer-level settings same as the regular Cartesian kinematic:
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```
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[printer]
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kinematics: generic_cartesian
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max_velocity:
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max_accel:
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#minimum_cruise_ratio:
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#square_corner_velocity:
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#max_accel_to_decel:
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#max_z_velocity:
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#max_z_accel:
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```
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Then a user must define the following three carriages: `[carriage x]`,
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`[carriage y]`, and `[carriage z]`, e.g.
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```
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[carriage x]
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endstop_pin:
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# Endstop switch detection pin. If this endstop pin is on a
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# different mcu than the stepper motor(s) moving this carriage,
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# then it enables "multi-mcu homing". This parameter must be provided.
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#position_min: 0
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# Minimum valid distance (in mm) the user may command the carriage to
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# move to. The default is 0mm.
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position_endstop:
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# Location of the endstop (in mm). This parameter must be provided.
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position_max:
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# Maximum valid distance (in mm) the user may command the stepper to
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# move to. This parameter must be provided.
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#homing_speed: 5.0
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# Maximum velocity (in mm/s) of the carriage when homing. The default
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# is 5mm/s.
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#homing_retract_dist: 5.0
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# Distance to backoff (in mm) before homing a second time during
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# homing. Set this to zero to disable the second home. The default
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# is 5mm.
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#homing_retract_speed:
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# Speed to use on the retract move after homing in case this should
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# be different from the homing speed, which is the default for this
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# parameter
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#second_homing_speed:
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# Velocity (in mm/s) of the carriage when performing the second home.
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# The default is homing_speed/2.
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#homing_positive_dir:
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# If true, homing will cause the carriage to move in a positive
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# direction (away from zero); if false, home towards zero. It is
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# better to use the default than to specify this parameter. The
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# default is true if position_endstop is near position_max and false
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# if near position_min.
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```
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Afterwards, a user specifies the stepper motors that move these carriages,
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for instance
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```
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[stepper my_stepper]
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carriages:
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# A string describing the carriages the stepper moves. All defined
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# carriages can be specified here, as well as their linear combinations,
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# e.g. x, x+y, y-0.5*z, x-z, etc. This parameter must be provided.
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step_pin:
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dir_pin:
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enable_pin:
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rotation_distance:
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microsteps:
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#full_steps_per_rotation: 200
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#gear_ratio:
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#step_pulse_duration:
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```
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See [stepper](#stepper) section for more information on the regular
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stepper parameters. The `carriages` parameter defines how the stepper
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affects the motion of the carriages. For example, `x+y` indicates that
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the motion of the stepper in the positive direction by the distance `d`
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moves the carriages `x` and `y` by the same distance `d` in the positive
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direction, while `x-0.5*y` means the motion of the stepper in the positive
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direction by the distance `d` moves the carriage `x` by the distance `d`
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in the positive direction, but the carriage `y` will travel distance `d/2`
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in the negative direction.
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More than a single stepper motor can be defined to drive the same axis
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or belt. For example, on a CoreXY AWD setups two motors driving the same
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belt can be defined as
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```
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[carriage x]
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endstop_pin: ...
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...
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[carriage y]
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endstop_pin: ...
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...
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[stepper a0]
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carriages: x-y
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step_pin: ...
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dir_pin: ...
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enable_pin: ...
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rotation_distance: ...
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...
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[stepper a1]
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carriages: x-y
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step_pin: ...
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dir_pin: ...
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enable_pin: ...
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rotation_distance: ...
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...
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```
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with `a0` and `a1` steppers having their own control pins, but
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sharing the same `carriages` and corresponding endstops.
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There are situations when a user wants to have more than one endstop
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per axis. Examples of such configurations include Y axis driven by
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two independent stepper motors with belts attached to both ends of the
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X beam, with effectively two carriages on Y axis each having an
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independent endstop, and multi-stepper Z axis with each stepper having
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its own endstop (not to be confused with the configurations with
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multiple Z motors but only a single endstop). These configurations
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can be declared by specifying additional carriage(s) with their endstops:
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```
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[extra_carriage my_carriage]
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primary_carriage:
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# The name of the primary carriage this carriage corresponds to.
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# It also effectively defines the axis the carriage moves over.
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# This parameter must be provided.
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endstop_pin:
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# Endstop switch detection pin. This parameter must be provided.
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```
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and the corresponding stepper motors, for example:
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```
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[extra_carriage y1]
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primary_carriage: y
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endstop_pin: ...
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[stepper sy1]
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carriages: y1
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...
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```
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Notably, an `[extra_carriage]` does not define parameters such as
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`position_min`, `position_max`, and `position_endstop`, but instead
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inherits them from the specified `primary_carriage`, thus sharing
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the same range of motion with the primary carriage.
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For the references on how to configure IDEX setups, see the
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[dual carriage](#dual-carriage) section.
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### None Kinematics
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It is possible to define a special "none" kinematics to disable
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@ -2207,8 +2374,8 @@ for an example configuration.
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### [dual_carriage]
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Support for cartesian and hybrid_corexy/z printers with dual carriages
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on a single axis. The carriage mode can be set via the
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Support for cartesian, generic_cartesian and hybrid_corexy/z printers with
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dual carriages on a single axis. The carriage mode can be set via the
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SET_DUAL_CARRIAGE extended g-code command. For example,
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"SET_DUAL_CARRIAGE CARRIAGE=1" command will activate the carriage defined
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in this section (CARRIAGE=0 will return activation to the primary carriage).
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@ -2235,7 +2402,7 @@ typically be achieved with
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or a similar command.
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See [sample-idex.cfg](../config/sample-idex.cfg) for an example
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configuration.
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configuration with a regular Cartesian kinematic.
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```
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[dual_carriage]
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@ -2249,7 +2416,7 @@ axis:
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# error. If safe_distance is not provided, it will be inferred from
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# position_min and position_max for the dual and primary carriages. If set
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# to 0 (or safe_distance is unset and position_min and position_max are
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# identical for the primary and dual carraiges), the carriages proximity
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# identical for the primary and dual carriages), the carriages proximity
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# checks will be disabled.
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#step_pin:
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#dir_pin:
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@ -2263,6 +2430,62 @@ axis:
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# See the "stepper" section for the definition of the above parameters.
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```
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For an example of dual carriage configuration with `generic_cartesian`
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kinematic, see the following configuration
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[sample](../config/example-generic-caretesian.cfg).
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Please note that in this case the `[dual_carriage]` configuration deviates
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from the configuration described above:
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```
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[dual_carriage my_dc_carriage]
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primary_carriage:
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# Defines the matching primary carriage of this dual carriage and
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# the corresponding IDEX axis. Valid choices are x, y, z.
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# This parameter must be provided.
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#safe_distance:
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# The minimum distance (in mm) to enforce between the dual and the primary
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# carriages. If a G-Code command is executed that will bring the carriages
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# closer than the specified limit, such a command will be rejected with an
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# error. If safe_distance is not provided, it will be inferred from
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# position_min and position_max for the dual and primary carriages. If set
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# to 0 (or safe_distance is unset and position_min and position_max are
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# identical for the primary and dual carriages), the carriages proximity
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# checks will be disabled.
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endstop_pin:
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#position_min:
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position_endstop:
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position_max:
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#homing_speed:
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#homing_retract_dist:
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#homing_retract_speed:
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#second_homing_speed:
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#homing_positive_dir:
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...
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```
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Refer to [generic cartesian](#generic-cartesian) section for more information
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on the regular `carriage` parameters.
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Then a user must define one or more stepper motors moving the dual carriage
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(and other carriages as appropriate), for instance
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```
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[carriage x]
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...
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[carriage y]
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...
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[dual_carriage u]
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primary_carriage: x
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...
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[stepper dc_stepper]
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carriages: u-y
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...
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```
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It is worth noting that `generic_cartesian` kinematic can support two
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dual carriages for X and Y axes. For reference, see for instance a
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[sample](../config/sample-corexyuv.cfg) of CoreXYUV configuration.
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### [extruder_stepper]
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Support for additional steppers synchronized to the movement of an
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