49% less heating when running at low speed and standstill, 4% more torque at maximum extrusion rate (15mm^3/s), 15% more torque in high speed movements (un/retractions).
StealthChop mode is used for low speeds (below 900mm/min)
spreadCycle is used above. Transition speed is well above maximum extrusion rate of 15mm^3/s (275mm/min) so mode transition is not expected to be visible on printed surface.
StealthChop is expected to improve printed surface quality (less artifacts).
Warning you can burn extruder motor if it is not the same impedance as original Prusa i3 Extruder stepper motor. There is no current feedback in low speed so lower impedance motor can be burned by over current.
Even there is no direct current feedback, there is no risk for original motor thermal runaway, as motor resistance increases with temperature, current decreases.
Standstill peak phase current is expected to be 500 mA and linearly increase with speed to 970 mA at 900mm/min where spreadCycle constant current regulation takes over and keeps peak current at 805 mA to maximum speed possible.
As motor heating increases with current squared, lowering low speed current from 700mA to 500mA decreases heating 49% in thate mode, where motor spends most of the time.
Introduce new macros TMC2130_MINIMUM_DELAY/STEPPER_MINIMUM_DELAY for
blocking pauses.
If MINIMUM_PULSE has defined to be zero, avoid the delay call entirely.
Add constants for the various required delays in tmc2130.h,
which will come in handy for stepper.cpp as well.
Move the delays in the _set functions and remove the pauses
from the various calling points and macros.
Note that the hard-coded pause wouldn't cut it for the stepper ISR,
but it's fine for other use cases.
Introduce new wrapper macros to tick the stepper pins.
Default to the original raising-edge stepping mode.
When using the TMC double-edge stepping mode (aka half-wave or
square-wave mode) the _LO macros become no-ops.
Timing functions (millis, micros and delay) replaced in whole source, defined in Marlin.h.
This commit enables original implementation (SYSTEM_TIMER_2 undefined)
Verified with passed complete wizard process.
sketch/tmc2130.cpp:921:32: warning: 'reg' may be used uninitialized in this function [-Wmaybe-uninitialized]
This was completely innocent, as reg was zeroed inside for loop.
sketch/tmc2130.cpp:795:94: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
sketch/tmc2130.cpp:807:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
sketch/tmc2130.cpp: In function 'void tmc2130_get_wave(uint8_t, uint8_t*, __file*)':
sketch/tmc2130.cpp:839:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
Marek Bel
DRracer
Yuri D'Elia
Voinea Dragos
vintagepc
MRprusa3d
Robert Pelnar
Petr Ledvina
tarikku