ManuelW/grbl-LPC-CoreXY
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Arc mm_per_segment removed, now in terms of tolerance. Stepper ramp counter variable type corrected.

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- Arc mm_per_segment parameter was removed and replaced with an
arc_tolerance parameter, which scales all arc segments automatically to
radius, such that the line segment error doesn't exceed the tolerance.
Significantly improves arc performance through larger radius arc,
because the segments are much longer and the planner buffer has more to
work with.

- Moved n_arc correction from the settings to config.h. Mathematically
this doesn't need to be a setting anymore, as the default config value
will work for all known CNC applications. The error does not accumulate
as much anymore, since the small angle approximation used by the arc
generation has been updated to a third-order approximation and how the
line segment length scale with radius and tolerance now. Left in
config.h for extraneous circumstances.

- Corrected the st.ramp_count variable (acceleration tick counter) to a
8-bit vs. 32-bit variable. Should make the stepper algorithm just a
touch faster overall.
This commit is contained in:
Sonny Jeon
2012-12-19 17:30:09 -07:00
parent a1397f61c4
commit 3dfffa622d
8 changed files with 208 additions and 128 deletions
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12
defaults.h
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@ -33,7 +33,7 @@
#define DEFAULT_Y_STEPS_PER_MM 250.0
#define DEFAULT_Z_STEPS_PER_MM 250.0
#define DEFAULT_STEP_PULSE_MICROSECONDS 10
#define DEFAULT_MM_PER_ARC_SEGMENT 0.1
#define DEFAULT_ARC_TOLERANCE 0.005 // mm
#define DEFAULT_RAPID_FEEDRATE 500.0 // mm/min
#define DEFAULT_FEEDRATE 250.0
#define DEFAULT_ACCELERATION (10.0*60*60) // 10 mm/min^2
@ -51,7 +51,6 @@
#define DEFAULT_HOMING_PULLOFF 1.0 // mm
#define DEFAULT_STEPPER_IDLE_LOCK_TIME 25 // msec (0-255)
#define DEFAULT_DECIMAL_PLACES 3
#define DEFAULT_N_ARC_CORRECTION 25
#endif
#ifdef DEFAULTS_SHERLINE_5400
@ -64,7 +63,7 @@
#define DEFAULT_Y_STEPS_PER_MM (STEPS_PER_REV*MICROSTEPS/MM_PER_REV)
#define DEFAULT_Z_STEPS_PER_MM (STEPS_PER_REV*MICROSTEPS/MM_PER_REV)
#define DEFAULT_STEP_PULSE_MICROSECONDS 10
#define DEFAULT_MM_PER_ARC_SEGMENT 0.1
#define DEFAULT_ARC_TOLERANCE 0.005 // mm
#define DEFAULT_RAPID_FEEDRATE 635.0 // mm/min (25ipm)
#define DEFAULT_FEEDRATE 254.0 // mm/min (10ipm)
#define DEFAULT_ACCELERATION 50.0*60*60 // 50 mm/min^2
@ -82,7 +81,6 @@
#define DEFAULT_HOMING_PULLOFF 1.0 // mm
#define DEFAULT_STEPPER_IDLE_LOCK_TIME 25 // msec (0-255)
#define DEFAULT_DECIMAL_PLACES 3
#define DEFAULT_N_ARC_CORRECTION 25
#endif
#ifdef DEFAULTS_SHAPEOKO
@ -98,7 +96,7 @@
#define DEFAULT_Y_STEPS_PER_MM (MICROSTEPS_XY*STEP_REVS_XY/MM_PER_REV_XY)
#define DEFAULT_Z_STEPS_PER_MM (MICROSTEPS_Z*STEP_REVS_Z/MM_PER_REV_Z)
#define DEFAULT_STEP_PULSE_MICROSECONDS 10
#define DEFAULT_MM_PER_ARC_SEGMENT 0.1
#define DEFAULT_ARC_TOLERANCE 0.005 // mm
#define DEFAULT_RAPID_FEEDRATE 1000.0 // mm/min
#define DEFAULT_FEEDRATE 250.0
#define DEFAULT_ACCELERATION (15.0*60*60) // 15 mm/min^2
@ -116,7 +114,6 @@
#define DEFAULT_HOMING_PULLOFF 1.0 // mm
#define DEFAULT_STEPPER_IDLE_LOCK_TIME 255 // msec (0-255)
#define DEFAULT_DECIMAL_PLACES 3
#define DEFAULT_N_ARC_CORRECTION 25
#endif
#ifdef DEFAULTS_ZEN_TOOLWORKS_7x7
@ -130,7 +127,7 @@
#define DEFAULT_Y_STEPS_PER_MM (STEPS_PER_REV*MICROSTEPS/MM_PER_REV)
#define DEFAULT_Z_STEPS_PER_MM (STEPS_PER_REV*MICROSTEPS/MM_PER_REV)
#define DEFAULT_STEP_PULSE_MICROSECONDS 10
#define DEFAULT_MM_PER_ARC_SEGMENT 0.1
#define DEFAULT_ARC_TOLERANCE 0.005 // mm
#define DEFAULT_RAPID_FEEDRATE 2500.0 // mm/min
#define DEFAULT_FEEDRATE 1000.0 // mm/min
#define DEFAULT_ACCELERATION 150.0*60*60 // 150 mm/min^2
@ -148,7 +145,6 @@
#define DEFAULT_HOMING_PULLOFF 1.0 // mm
#define DEFAULT_STEPPER_IDLE_LOCK_TIME 25 // msec (0-255)
#define DEFAULT_DECIMAL_PLACES 3
#define DEFAULT_N_ARC_CORRECTION 25
#endif
#endif