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🚸 Nonlinear Extrusion polynomial Av^2+Bv+C (#27162)

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Vovodroid 2024-06-10 21:42:28 +03:00 committed by GitHub
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commit d9fc4f3a99
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2 changed files with 4 additions and 4 deletions
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6
Marlin/src/gcode/feature/nonlinear/M592.cpp
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@ -35,12 +35,12 @@ void GcodeSuite::M592_report(const bool forReplay/*=true*/) {
/**
* M592: Get or set nonlinear extrusion parameters
* A<factor> Linear coefficient (default 0.0)
* B<factor> Quadratic coefficient (default 0.0)
* A<factor> Quadratic coefficient (default 0.0)
* B<factor> Linear coefficient (default 0.0)
* C<factor> Constant coefficient (default 1.0)
*
* Adjusts the amount of extrusion based on the instantaneous velocity of extrusion, as a multiplier.
* The amount of extrusion is multiplied by max(C, C + A*v + B*v^2) where v is extruder velocity in mm/s.
* The amount of extrusion is multiplied by max(C, A*v^2 + B*v + C) where v is extruder velocity in mm/s.
* Only adjusts forward extrusions, since those are the ones affected by backpressure.
*/
void GcodeSuite::M592() {

2
Marlin/src/module/stepper.cpp
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@ -2234,7 +2234,7 @@ hal_timer_t Stepper::calc_timer_interval(uint32_t step_rate) {
#if ENABLED(NONLINEAR_EXTRUSION)
void Stepper::calc_nonlinear_e(uint32_t step_rate) {
const uint32_t velocity = ne_scale * step_rate; // Scale step_rate first so all intermediate values stay in range of 8.24 fixed point math
int32_t vd = (((int64_t)ne_fix.A * velocity) >> 24) + (((((int64_t)ne_fix.B * velocity) >> 24) * velocity) >> 24);
int32_t vd = (((((int64_t)ne_fix.A * velocity) >> 24) * velocity) >> 24) + (((int64_t)ne_fix.B * velocity) >> 24);
NOLESS(vd, 0);
advance_dividend.e = (uint64_t(ne_fix.C + vd) * ne_edividend) >> 24;