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BugFix for incorrect E-speed calculation

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The extrusion speed was wrong due to a not high enough precision of
esteps to XY steps, therefore now the target float values are used to
calculate the ratio between XY movement and extrusion speed.
The e_speed_multiplier8 was replaced by an absolute multiplier called
abs_adv_steps_multiplier8, therefore one multiplication and bitshift can
be saved inside the stepper ISR. Due to this, also extruder_advance_k is
better suited inside the planner and not the stepper files any more.
This commit is contained in:
Sebastianv650
2016-10-31 16:17:30 +01:00
parent fa6bf12697
commit f9bea7968f
5 changed files with 48 additions and 30 deletions
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31
Marlin/planner.cpp
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@@ -131,6 +131,11 @@ float Planner::previous_speed[NUM_AXIS],
long Planner::axis_segment_time[2][3] = { {MAX_FREQ_TIME + 1, 0, 0}, {MAX_FREQ_TIME + 1, 0, 0} };
#endif
#if ENABLED(LIN_ADVANCE)
float Planner::extruder_advance_k = LIN_ADVANCE_K;
float Planner::position_float[NUM_AXIS] = { 0 };
#endif
/**
* Class and Instance Methods
*/
@@ -140,6 +145,9 @@ Planner::Planner() { init(); }
void Planner::init() {
block_buffer_head = block_buffer_tail = 0;
ZERO(position);
#if ENABLED(LIN_ADVANCE)
ZERO(position_float);
#endif
ZERO(previous_speed);
previous_nominal_speed = 0.0;
#if ABL_PLANAR
@@ -604,6 +612,14 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
lround(c * axis_steps_per_mm[Z_AXIS]),
lround(e * axis_steps_per_mm[E_AXIS])
};
#if ENABLED(LIN_ADVANCE)
float target_float[XYZE] = {a, b, c, e};
float de_float = target_float[E_AXIS] - position_float[E_AXIS];
float mm_D_float = sqrt(sq(target_float[X_AXIS] - position_float[X_AXIS]) + sq(target_float[Y_AXIS] - position_float[Y_AXIS]));
memcpy(position_float, target_float, sizeof(position_float));
#endif
long da = target[X_AXIS] - position[X_AXIS],
db = target[Y_AXIS] - position[Y_AXIS],
@@ -1232,12 +1248,12 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
// This leads to an enormous number of advance steps due to a huge e_acceleration.
// The math is correct, but you don't want a retract move done with advance!
// So this situation is filtered out here.
if (!esteps || (!block->steps[X_AXIS] && !block->steps[Y_AXIS]) || stepper.get_advance_k() == 0 || (uint32_t)esteps == block->step_event_count) {
if (!esteps || (!block->steps[X_AXIS] && !block->steps[Y_AXIS]) || extruder_advance_k == 0.0 || (uint32_t)esteps == block->step_event_count) {
block->use_advance_lead = false;
}
else {
block->use_advance_lead = true;
block->e_speed_multiplier8 = (esteps << 8) / block->step_event_count;
block->abs_adv_steps_multiplier8 = lround(extruder_advance_k * (de_float / mm_D_float) * block->nominal_speed / (float)block->nominal_rate * axis_steps_per_mm[Z_AXIS] * 256.0);
}
#elif ENABLED(ADVANCE)
@@ -1354,3 +1370,14 @@ void Planner::refresh_positioning() {
}
#endif
#if ENABLED(LIN_ADVANCE)
void Planner::advance_M905(const float &k) {
if (k >= 0.0) extruder_advance_k = k;
SERIAL_ECHO_START;
SERIAL_ECHOPAIR("Advance factor: ", extruder_advance_k);
SERIAL_EOL;
}
#endif