andrey
/
Marlin_FB4S
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Browse Source

BugFix for incorrect E-speed calculation 

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.
pull/1/head
Sebastianv650 8 years ago
parent
fa6bf12697
commit
f9bea7968f
5 changed files with 48 additions and 30 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Unified View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 2
      Marlin/Marlin_main.cpp
  2. 31
      Marlin/planner.cpp
  3. 11
      Marlin/planner.h
  4. 24
      Marlin/stepper.cpp
  5. 10
      Marlin/stepper.h

2
Marlin/Marlin_main.cpp
View File

@ -6988,7 +6988,7 @@ inline void gcode_M503() {
*/ */
inline void gcode_M905() { inline void gcode_M905() {
stepper.synchronize(); stepper.synchronize();
stepper.advance_M905(code_seen('K') ? code_value_float() : -1.0); planner.advance_M905(code_seen('K') ? code_value_float() : -1.0);
} }
#endif #endif

31
Marlin/planner.cpp
View File

@ -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} }; long Planner::axis_segment_time[2][3] = { {MAX_FREQ_TIME + 1, 0, 0}, {MAX_FREQ_TIME + 1, 0, 0} };
#endif #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 * Class and Instance Methods
*/ */
@ -140,6 +145,9 @@ Planner::Planner() { init(); }
void Planner::init() { void Planner::init() {
block_buffer_head = block_buffer_tail = 0; block_buffer_head = block_buffer_tail = 0;
ZERO(position); ZERO(position);
#if ENABLED(LIN_ADVANCE)
ZERO(position_float);
#endif
ZERO(previous_speed); ZERO(previous_speed);
previous_nominal_speed = 0.0; previous_nominal_speed = 0.0;
#if ABL_PLANAR #if ABL_PLANAR
@ -605,6 +613,14 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
lround(e * axis_steps_per_mm[E_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], long da = target[X_AXIS] - position[X_AXIS],
db = target[Y_AXIS] - position[Y_AXIS], db = target[Y_AXIS] - position[Y_AXIS],
dc = target[Z_AXIS] - position[Z_AXIS]; dc = target[Z_AXIS] - position[Z_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. // 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! // The math is correct, but you don't want a retract move done with advance!
// So this situation is filtered out here. // 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; block->use_advance_lead = false;
} }
else { else {
block->use_advance_lead = true; 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) #elif ENABLED(ADVANCE)
@ -1354,3 +1370,14 @@ void Planner::refresh_positioning() {
} }
#endif #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

11
Marlin/planner.h
View File

@ -95,7 +95,7 @@ typedef struct {
// Advance extrusion // Advance extrusion
#if ENABLED(LIN_ADVANCE) #if ENABLED(LIN_ADVANCE)
bool use_advance_lead; bool use_advance_lead;
int16_t e_speed_multiplier8; // Factorised by 2^8 to avoid float uint32_t abs_adv_steps_multiplier8; // Factorised by 2^8 to avoid float
#elif ENABLED(ADVANCE) #elif ENABLED(ADVANCE)
int32_t advance_rate; int32_t advance_rate;
volatile int32_t initial_advance; volatile int32_t initial_advance;
@ -197,6 +197,11 @@ class Planner {
static long axis_segment_time[2][3]; static long axis_segment_time[2][3];
#endif #endif
#if ENABLED(LIN_ADVANCE)
static float position_float[NUM_AXIS];
static float extruder_advance_k;
#endif
public: public:
/** /**
@ -246,6 +251,10 @@ class Planner {
#endif #endif
#if ENABLED(LIN_ADVANCE)
void advance_M905(const float &k);
#endif
/** /**
* Planner::_buffer_line * Planner::_buffer_line
* *

24
Marlin/stepper.cpp
View File

@ -96,8 +96,7 @@ volatile uint32_t Stepper::step_events_completed = 0; // The number of step even
#if ENABLED(LIN_ADVANCE) #if ENABLED(LIN_ADVANCE)
volatile int Stepper::e_steps[E_STEPPERS]; volatile int Stepper::e_steps[E_STEPPERS];
int Stepper::extruder_advance_k = LIN_ADVANCE_K, int Stepper::final_estep_rate,
Stepper::final_estep_rate,
Stepper::current_estep_rate[E_STEPPERS], Stepper::current_estep_rate[E_STEPPERS],
Stepper::current_adv_steps[E_STEPPERS]; Stepper::current_adv_steps[E_STEPPERS];
#else #else
@ -534,7 +533,7 @@ void Stepper::isr() {
#if ENABLED(LIN_ADVANCE) #if ENABLED(LIN_ADVANCE)
if (current_block->use_advance_lead) { if (current_block->use_advance_lead) {
int delta_adv_steps = (((long)extruder_advance_k * current_estep_rate[TOOL_E_INDEX]) >> 9) - current_adv_steps[TOOL_E_INDEX]; int delta_adv_steps = current_estep_rate[TOOL_E_INDEX] - current_adv_steps[TOOL_E_INDEX];
current_adv_steps[TOOL_E_INDEX] += delta_adv_steps; current_adv_steps[TOOL_E_INDEX] += delta_adv_steps;
#if ENABLED(MIXING_EXTRUDER) #if ENABLED(MIXING_EXTRUDER)
// Mixing extruders apply advance lead proportionally // Mixing extruders apply advance lead proportionally
@ -572,9 +571,9 @@ void Stepper::isr() {
if (current_block->use_advance_lead) { if (current_block->use_advance_lead) {
#if ENABLED(MIXING_EXTRUDER) #if ENABLED(MIXING_EXTRUDER)
MIXING_STEPPERS_LOOP(j) MIXING_STEPPERS_LOOP(j)
current_estep_rate[j] = ((uint32_t)acc_step_rate * current_block->e_speed_multiplier8 * current_block->step_event_count / current_block->mix_event_count[j]) >> 8; current_estep_rate[j] = ((uint32_t)acc_step_rate * current_block->abs_adv_steps_multiplier8 * current_block->step_event_count / current_block->mix_event_count[j]) >> 17;
#else #else
current_estep_rate[TOOL_E_INDEX] = ((uint32_t)acc_step_rate * current_block->e_speed_multiplier8) >> 8; current_estep_rate[TOOL_E_INDEX] = ((uint32_t)acc_step_rate * current_block->abs_adv_steps_multiplier8) >> 17;
#endif #endif
} }
@ -624,9 +623,9 @@ void Stepper::isr() {
if (current_block->use_advance_lead) { if (current_block->use_advance_lead) {
#if ENABLED(MIXING_EXTRUDER) #if ENABLED(MIXING_EXTRUDER)
MIXING_STEPPERS_LOOP(j) MIXING_STEPPERS_LOOP(j)
current_estep_rate[j] = ((uint32_t)step_rate * current_block->e_speed_multiplier8 * current_block->step_event_count / current_block->mix_event_count[j]) >> 8; current_estep_rate[j] = ((uint32_t)step_rate * current_block->abs_adv_steps_multiplier8 * current_block->step_event_count / current_block->mix_event_count[j]) >> 17;
#else #else
current_estep_rate[TOOL_E_INDEX] = ((uint32_t)step_rate * current_block->e_speed_multiplier8) >> 8; current_estep_rate[TOOL_E_INDEX] = ((uint32_t)step_rate * current_block->abs_adv_steps_multiplier8) >> 17;
#endif #endif
} }
@ -1350,14 +1349,3 @@ void Stepper::report_positions() {
} }
#endif // HAS_MICROSTEPS #endif // HAS_MICROSTEPS
#if ENABLED(LIN_ADVANCE)
void Stepper::advance_M905(const float &k) {
if (k >= 0) extruder_advance_k = k;
SERIAL_ECHO_START;
SERIAL_ECHOPAIR("Advance factor: ", extruder_advance_k);
SERIAL_EOL;
}
#endif // LIN_ADVANCE

10
Marlin/stepper.h
View File

@ -109,7 +109,6 @@ class Stepper {
static volatile unsigned char eISR_Rate; static volatile unsigned char eISR_Rate;
#if ENABLED(LIN_ADVANCE) #if ENABLED(LIN_ADVANCE)
static volatile int e_steps[E_STEPPERS]; static volatile int e_steps[E_STEPPERS];
static int extruder_advance_k;
static int final_estep_rate; static int final_estep_rate;
static int current_estep_rate[E_STEPPERS]; // Actual extruder speed [steps/s] static int current_estep_rate[E_STEPPERS]; // Actual extruder speed [steps/s]
static int current_adv_steps[E_STEPPERS]; // The amount of current added esteps due to advance. static int current_adv_steps[E_STEPPERS]; // The amount of current added esteps due to advance.
@ -277,11 +276,6 @@ class Stepper {
return endstops_trigsteps[axis] * planner.steps_to_mm[axis]; return endstops_trigsteps[axis] * planner.steps_to_mm[axis];
} }
#if ENABLED(LIN_ADVANCE)
void advance_M905(const float &k);
FORCE_INLINE int get_advance_k() { return extruder_advance_k; }
#endif
private: private:
static FORCE_INLINE unsigned short calc_timer(unsigned short step_rate) { static FORCE_INLINE unsigned short calc_timer(unsigned short step_rate) {
@ -367,8 +361,8 @@ class Stepper {
#if ENABLED(LIN_ADVANCE) #if ENABLED(LIN_ADVANCE)
if (current_block->use_advance_lead) { if (current_block->use_advance_lead) {
current_estep_rate[current_block->active_extruder] = ((unsigned long)acc_step_rate * current_block->e_speed_multiplier8) >> 8; current_estep_rate[current_block->active_extruder] = ((unsigned long)acc_step_rate * current_block->abs_adv_steps_multiplier8) >> 17;
final_estep_rate = (current_block->nominal_rate * current_block->e_speed_multiplier8) >> 8; final_estep_rate = (current_block->nominal_rate * current_block->abs_adv_steps_multiplier8) >> 17;
} }
#endif #endif

Write Preview
Loading…
Cancel
Save