Optimize planner with precalculation, etc.

Marlin/Marlin_main.cpp

@@ -610,6 +610,20 @@ static void report_current_position();
     print_xyz(PSTR(STRINGIFY(VAR) "="), PSTR(" : " SUFFIX "\n"), VAR); } while(0)
 #endif
 
+/**
+ * sync_plan_position
+ * Set planner / stepper positions to the cartesian current_position.
+ * The stepper code translates these coordinates into step units.
+ * Allows translation between steps and millimeters for cartesian & core robots
+ */
+inline void sync_plan_position() {
+  #if ENABLED(DEBUG_LEVELING_FEATURE)
+    if (DEBUGGING(LEVELING)) DEBUG_POS("sync_plan_position", current_position);
+  #endif
+  planner.set_position_mm(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
+}
+inline void sync_plan_position_e() { planner.set_e_position_mm(current_position[E_AXIS]); }
+
 #if ENABLED(DELTA) || ENABLED(SCARA)
   inline void sync_plan_position_delta() {
     #if ENABLED(DEBUG_LEVELING_FEATURE)
@@ -897,16 +911,15 @@ void setup() {
   // Send "ok" after commands by default
   for (int8_t i = 0; i < BUFSIZE; i++) send_ok[i] = true;
 
-  // loads data from EEPROM if available else uses defaults (and resets step acceleration rate)
+  // Load data from EEPROM if available (or use defaults)
+  // This also updates variables in the planner, elsewhere
   Config_RetrieveSettings();
 
   // Initialize current position based on home_offset
   memcpy(current_position, home_offset, sizeof(home_offset));
 
-  #if ENABLED(DELTA) || ENABLED(SCARA)
-    // Vital to init kinematic equivalent for X0 Y0 Z0
-    SYNC_PLAN_POSITION_KINEMATIC();
-  #endif
+  // Vital to init stepper/planner equivalent for current_position
+  SYNC_PLAN_POSITION_KINEMATIC();
 
   thermalManager.init();    // Initialize temperature loop
 
@@ -1319,7 +1332,7 @@ inline bool code_value_bool() { return code_value_byte() > 0; }
       case TEMPUNIT_C:
         return code_value_float();
       case TEMPUNIT_F:
-        return (code_value_float() - 32) / 1.8;
+        return (code_value_float() - 32) * 0.5555555556;
       case TEMPUNIT_K:
         return code_value_float() - 272.15;
       default:
@@ -1333,7 +1346,7 @@ inline bool code_value_bool() { return code_value_byte() > 0; }
       case TEMPUNIT_K:
         return code_value_float();
       case TEMPUNIT_F:
-        return code_value_float() / 1.8;
+        return code_value_float() * 0.5555555556;
       default:
         return code_value_float();
     }
@@ -1627,19 +1640,6 @@ inline void line_to_destination(float fr_mm_m) {
 }
 inline void line_to_destination() { line_to_destination(feedrate_mm_m); }
 
-/**
- * sync_plan_position
- * Set planner / stepper positions to the cartesian current_position.
- * The stepper code translates these coordinates into step units.
- * Allows translation between steps and millimeters for cartesian & core robots
- */
-inline void sync_plan_position() {
-  #if ENABLED(DEBUG_LEVELING_FEATURE)
-    if (DEBUGGING(LEVELING)) DEBUG_POS("sync_plan_position", current_position);
-  #endif
-  planner.set_position_mm(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
-}
-inline void sync_plan_position_e() { planner.set_e_position_mm(current_position[E_AXIS]); }
 inline void set_current_to_destination() { memcpy(current_position, destination, sizeof(current_position)); }
 inline void set_destination_to_current() { memcpy(destination, current_position, sizeof(destination)); }
 
@@ -5147,6 +5147,7 @@ inline void gcode_M92() {
       }
     }
   }
+  planner.refresh_positioning();
 }
 
 /**
@@ -6140,7 +6141,7 @@ inline void gcode_M428() {
   bool err = false;
   LOOP_XYZ(i) {
     if (axis_homed[i]) {
-      float base = (current_position[i] > (sw_endstop_min[i] + sw_endstop_max[i]) / 2) ? base_home_pos(i) : 0,
+      float base = (current_position[i] > (sw_endstop_min[i] + sw_endstop_max[i]) * 0.5) ? base_home_pos(i) : 0,
             diff = current_position[i] - LOGICAL_POSITION(base, i);
       if (diff > -20 && diff < 20) {
         set_home_offset((AxisEnum)i, home_offset[i] - diff);

Marlin/configuration_store.cpp

@@ -171,10 +171,16 @@ void Config_Postprocess() {
   // steps per s2 needs to be updated to agree with units per s2
   planner.reset_acceleration_rates();
 
+  // Make sure delta kinematics are updated before refreshing the
+  // planner position so the stepper counts will be set correctly.
   #if ENABLED(DELTA)
     recalc_delta_settings(delta_radius, delta_diagonal_rod);
   #endif
 
+  // Refresh steps_to_mm with the reciprocal of axis_steps_per_mm
+  // and init stepper.count[], planner.position[] with current_position
+  planner.refresh_positioning();
+
   #if ENABLED(PIDTEMP)
     thermalManager.updatePID();
   #endif

Marlin/planner.cpp

@@ -80,39 +80,40 @@ block_t Planner::block_buffer[BLOCK_BUFFER_SIZE];
 volatile uint8_t Planner::block_buffer_head = 0;           // Index of the next block to be pushed
 volatile uint8_t Planner::block_buffer_tail = 0;
 
-float Planner::max_feedrate_mm_s[NUM_AXIS]; // Max speeds in mm per second
-float Planner::axis_steps_per_mm[NUM_AXIS];
-unsigned long Planner::max_acceleration_steps_per_s2[NUM_AXIS];
-unsigned long Planner::max_acceleration_mm_per_s2[NUM_AXIS]; // Use M201 to override by software
+float Planner::max_feedrate_mm_s[NUM_AXIS], // Max speeds in mm per second
+      Planner::axis_steps_per_mm[NUM_AXIS],
+      Planner::steps_to_mm[NUM_AXIS];
+
+unsigned long Planner::max_acceleration_steps_per_s2[NUM_AXIS],
+              Planner::max_acceleration_mm_per_s2[NUM_AXIS]; // Use M201 to override by software
 
 millis_t Planner::min_segment_time;
-float Planner::min_feedrate_mm_s;
-float Planner::acceleration;         // Normal acceleration mm/s^2  DEFAULT ACCELERATION for all printing moves. M204 SXXXX
-float Planner::retract_acceleration; // Retract acceleration mm/s^2 filament pull-back and push-forward while standing still in the other axes M204 TXXXX
-float Planner::travel_acceleration;  // Travel acceleration mm/s^2  DEFAULT ACCELERATION for all NON printing moves. M204 MXXXX
-float Planner::max_xy_jerk;          // The largest speed change requiring no acceleration
-float Planner::max_z_jerk;
-float Planner::max_e_jerk;
-float Planner::min_travel_feedrate_mm_s;
+float Planner::min_feedrate_mm_s,
+      Planner::acceleration,         // Normal acceleration mm/s^2  DEFAULT ACCELERATION for all printing moves. M204 SXXXX
+      Planner::retract_acceleration, // Retract acceleration mm/s^2 filament pull-back and push-forward while standing still in the other axes M204 TXXXX
+      Planner::travel_acceleration,  // Travel acceleration mm/s^2  DEFAULT ACCELERATION for all NON printing moves. M204 MXXXX
+      Planner::max_xy_jerk,          // The largest speed change requiring no acceleration
+      Planner::max_z_jerk,
+      Planner::max_e_jerk,
+      Planner::min_travel_feedrate_mm_s;
 
 #if ENABLED(AUTO_BED_LEVELING_FEATURE)
   matrix_3x3 Planner::bed_level_matrix; // Transform to compensate for bed level
 #endif
 
 #if ENABLED(AUTOTEMP)
-  float Planner::autotemp_max = 250;
-  float Planner::autotemp_min = 210;
-  float Planner::autotemp_factor = 0.1;
+  float Planner::autotemp_max = 250,
+        Planner::autotemp_min = 210,
+        Planner::autotemp_factor = 0.1;
   bool Planner::autotemp_enabled = false;
 #endif
 
 // private:
 
 long Planner::position[NUM_AXIS] = { 0 };
 
-float Planner::previous_speed[NUM_AXIS];
-
-float Planner::previous_nominal_speed;
+float Planner::previous_speed[NUM_AXIS],
+      Planner::previous_nominal_speed;
 
 #if ENABLED(DISABLE_INACTIVE_EXTRUDER)
   uint8_t Planner::g_uc_extruder_last_move[EXTRUDERS] = { 0 };
@@ -783,31 +784,37 @@ void Planner::check_axes_activity() {
   #if ENABLED(COREXY) || ENABLED(COREXZ) || ENABLED(COREYZ)
     float delta_mm[6];
     #if ENABLED(COREXY)
-      delta_mm[X_HEAD] = dx / axis_steps_per_mm[A_AXIS];
-      delta_mm[Y_HEAD] = dy / axis_steps_per_mm[B_AXIS];
-      delta_mm[Z_AXIS] = dz / axis_steps_per_mm[Z_AXIS];
-      delta_mm[A_AXIS] = (dx + dy) / axis_steps_per_mm[A_AXIS];
-      delta_mm[B_AXIS] = (dx - dy) / axis_steps_per_mm[B_AXIS];
+      delta_mm[X_HEAD] = dx * steps_to_mm[A_AXIS];
+      delta_mm[Y_HEAD] = dy * steps_to_mm[B_AXIS];
+      delta_mm[Z_AXIS] = dz * steps_to_mm[Z_AXIS];
+      delta_mm[A_AXIS] = (dx + dy) * steps_to_mm[A_AXIS];
+      delta_mm[B_AXIS] = (dx - dy) * steps_to_mm[B_AXIS];
     #elif ENABLED(COREXZ)
-      delta_mm[X_HEAD] = dx / axis_steps_per_mm[A_AXIS];
-      delta_mm[Y_AXIS] = dy / axis_steps_per_mm[Y_AXIS];
-      delta_mm[Z_HEAD] = dz / axis_steps_per_mm[C_AXIS];
-      delta_mm[A_AXIS] = (dx + dz) / axis_steps_per_mm[A_AXIS];
-      delta_mm[C_AXIS] = (dx - dz) / axis_steps_per_mm[C_AXIS];
+      delta_mm[X_HEAD] = dx * steps_to_mm[A_AXIS];
+      delta_mm[Y_AXIS] = dy * steps_to_mm[Y_AXIS];
+      delta_mm[Z_HEAD] = dz * steps_to_mm[C_AXIS];
+      delta_mm[A_AXIS] = (dx + dz) * steps_to_mm[A_AXIS];
+      delta_mm[C_AXIS] = (dx - dz) * steps_to_mm[C_AXIS];
     #elif ENABLED(COREYZ)
-      delta_mm[X_AXIS] = dx / axis_steps_per_mm[A_AXIS];
-      delta_mm[Y_HEAD] = dy / axis_steps_per_mm[Y_AXIS];
-      delta_mm[Z_HEAD] = dz / axis_steps_per_mm[C_AXIS];
-      delta_mm[B_AXIS] = (dy + dz) / axis_steps_per_mm[B_AXIS];
-      delta_mm[C_AXIS] = (dy - dz) / axis_steps_per_mm[C_AXIS];
+      delta_mm[X_AXIS] = dx * steps_to_mm[X_AXIS];
+      delta_mm[Y_HEAD] = dy * steps_to_mm[B_AXIS];
+      delta_mm[Z_HEAD] = dz * steps_to_mm[C_AXIS];
+      delta_mm[B_AXIS] = (dy + dz) * steps_to_mm[B_AXIS];
+      delta_mm[C_AXIS] = (dy - dz) * steps_to_mm[C_AXIS];
     #endif
   #else
     float delta_mm[4];
-    delta_mm[X_AXIS] = dx / axis_steps_per_mm[X_AXIS];
-    delta_mm[Y_AXIS] = dy / axis_steps_per_mm[Y_AXIS];
-    delta_mm[Z_AXIS] = dz / axis_steps_per_mm[Z_AXIS];
+    #if ENABLED(DELTA)
+      // On delta all axes (should!) have the same steps-per-mm
+      // so calculate distance in steps first, then do one division
+      // at the end to get millimeters
+    #else
+      delta_mm[X_AXIS] = dx * steps_to_mm[X_AXIS];
+      delta_mm[Y_AXIS] = dy * steps_to_mm[Y_AXIS];
+      delta_mm[Z_AXIS] = dz * steps_to_mm[Z_AXIS];
+    #endif
   #endif
-  delta_mm[E_AXIS] = (de / axis_steps_per_mm[E_AXIS]) * volumetric_multiplier[extruder] * extruder_multiplier[extruder] / 100.0;
+  delta_mm[E_AXIS] = 0.01 * (de * steps_to_mm[E_AXIS]) * volumetric_multiplier[extruder] * extruder_multiplier[extruder];
 
   if (block->steps[X_AXIS] <= dropsegments && block->steps[Y_AXIS] <= dropsegments && block->steps[Z_AXIS] <= dropsegments) {
     block->millimeters = fabs(delta_mm[E_AXIS]);
@@ -820,10 +827,16 @@ void Planner::check_axes_activity() {
         sq(delta_mm[X_HEAD]) + sq(delta_mm[Y_AXIS]) + sq(delta_mm[Z_HEAD])
       #elif ENABLED(COREYZ)
         sq(delta_mm[X_AXIS]) + sq(delta_mm[Y_HEAD]) + sq(delta_mm[Z_HEAD])
+      #elif ENABLED(DELTA)
+        sq(dx) + sq(dy) + sq(dz)
       #else
         sq(delta_mm[X_AXIS]) + sq(delta_mm[Y_AXIS]) + sq(delta_mm[Z_AXIS])
       #endif
-    );
+    )
+      #if ENABLED(DELTA)
+        * steps_to_mm[X_AXIS]
+      #endif
+    ;
   }
   float inverse_millimeters = 1.0 / block->millimeters;  // Inverse millimeters to remove multiple divides
 
@@ -875,7 +888,7 @@ void Planner::check_axes_activity() {
         while (filwidth_delay_dist >= MMD_MM) filwidth_delay_dist -= MMD_MM;
 
         // Convert into an index into the measurement array
-        filwidth_delay_index1 = (int)(filwidth_delay_dist / 10.0 + 0.0001);
+        filwidth_delay_index1 = (int)(filwidth_delay_dist * 0.1 + 0.0001);
 
         // If the index has changed (must have gone forward)...
         if (filwidth_delay_index1 != filwidth_delay_index2) {
@@ -962,7 +975,7 @@ void Planner::check_axes_activity() {
       block->acceleration_steps_per_s2 = (max_acceleration_steps_per_s2[E_AXIS] * block->step_event_count) / block->steps[E_AXIS];
   }
   block->acceleration = block->acceleration_steps_per_s2 / steps_per_mm;
-  block->acceleration_rate = (long)(block->acceleration_steps_per_s2 * 16777216.0 / ((F_CPU) / 8.0));
+  block->acceleration_rate = (long)(block->acceleration_steps_per_s2 * 16777216.0 / ((F_CPU) * 0.125));
 
   #if 0  // Use old jerk for now
 
@@ -1008,10 +1021,12 @@ void Planner::check_axes_activity() {
   #endif
 
   // Start with a safe speed
-  float vmax_junction = max_xy_jerk / 2;
-  float vmax_junction_factor = 1.0;
-  float mz2 = max_z_jerk / 2, me2 = max_e_jerk / 2;
-  float csz = current_speed[Z_AXIS], cse = current_speed[E_AXIS];
+  float vmax_junction = max_xy_jerk * 0.5,
+        vmax_junction_factor = 1.0,
+        mz2 = max_z_jerk * 0.5,
+        me2 = max_e_jerk * 0.5,
+        csz = current_speed[Z_AXIS],
+        cse = current_speed[E_AXIS];
   if (fabs(csz) > mz2) vmax_junction = min(vmax_junction, mz2);
   if (fabs(cse) > me2) vmax_junction = min(vmax_junction, me2);
   vmax_junction = min(vmax_junction, block->nominal_speed);
@@ -1164,6 +1179,7 @@ void Planner::check_axes_activity() {
 void Planner::set_e_position_mm(const float& e) {
   position[E_AXIS] = lround(e * axis_steps_per_mm[E_AXIS]);
   stepper.set_e_position(position[E_AXIS]);
+  previous_speed[E_AXIS] = 0.0;
 }
 
 // Recalculate the steps/s^2 acceleration rates, based on the mm/s^2
@@ -1172,6 +1188,13 @@ void Planner::reset_acceleration_rates() {
     max_acceleration_steps_per_s2[i] = max_acceleration_mm_per_s2[i] * axis_steps_per_mm[i];
 }
 
+// Recalculate position, steps_to_mm if axis_steps_per_mm changes!
+void Planner::refresh_positioning() {
+  LOOP_XYZE(i) planner.steps_to_mm[i] = 1.0 / planner.axis_steps_per_mm[i];
+  set_position_mm(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);
+  reset_acceleration_rates();
+}
+
 #if ENABLED(AUTOTEMP)
 
   void Planner::autotemp_M109() {

Marlin/planner.h

@@ -121,6 +121,7 @@ class Planner {
 
     static float max_feedrate_mm_s[NUM_AXIS]; // Max speeds in mm per second
     static float axis_steps_per_mm[NUM_AXIS];
+    static float steps_to_mm[NUM_AXIS];
     static unsigned long max_acceleration_steps_per_s2[NUM_AXIS];
     static unsigned long max_acceleration_mm_per_s2[NUM_AXIS]; // Use M201 to override by software
 
@@ -142,7 +143,7 @@ class Planner {
 
     /**
      * The current position of the tool in absolute steps
-     * Reclculated if any axis_steps_per_mm are changed by gcode
+     * Recalculated if any axis_steps_per_mm are changed by gcode
      */
     static long position[NUM_AXIS];
 
@@ -187,6 +188,7 @@ class Planner {
      */
 
     static void reset_acceleration_rates();
+    static void refresh_positioning();
 
     // Manage fans, paste pressure, etc.
     static void check_axes_activity();

Marlin/stepper.cpp

@@ -944,14 +944,14 @@ float Stepper::get_axis_position_mm(AxisEnum axis) {
       CRITICAL_SECTION_END;
       // ((a1+a2)+(a1-a2))/2 -> (a1+a2+a1-a2)/2 -> (a1+a1)/2 -> a1
       // ((a1+a2)-(a1-a2))/2 -> (a1+a2-a1+a2)/2 -> (a2+a2)/2 -> a2
-      axis_steps = (pos1 + ((axis == CORE_AXIS_1) ? pos2 : -pos2)) / 2.0f;
+      axis_steps = (pos1 + ((axis == CORE_AXIS_1) ? pos2 : -pos2)) * 0.5f;
     }
     else
       axis_steps = position(axis);
   #else
     axis_steps = position(axis);
   #endif
-  return axis_steps / planner.axis_steps_per_mm[axis];
+  return axis_steps * planner.steps_to_mm[axis];
 }
 
 void Stepper::finish_and_disable() {
@@ -973,9 +973,9 @@ void Stepper::endstop_triggered(AxisEnum axis) {
 
     float axis_pos = count_position[axis];
     if (axis == CORE_AXIS_1)
-      axis_pos = (axis_pos + count_position[CORE_AXIS_2]) / 2;
+      axis_pos = (axis_pos + count_position[CORE_AXIS_2]) * 0.5;
     else if (axis == CORE_AXIS_2)
-      axis_pos = (count_position[CORE_AXIS_1] - axis_pos) / 2;
+      axis_pos = (count_position[CORE_AXIS_1] - axis_pos) * 0.5;
     endstops_trigsteps[axis] = axis_pos;
 
   #else // !COREXY && !COREXZ && !COREYZ

Marlin/stepper.h

@@ -262,7 +262,7 @@ class Stepper {
     // Triggered position of an axis in mm (not core-savvy)
     //
     static FORCE_INLINE float triggered_position_mm(AxisEnum axis) {
-      return endstops_trigsteps[axis] / planner.axis_steps_per_mm[axis];
+      return endstops_trigsteps[axis] * planner.steps_to_mm[axis];
     }
 
     #if ENABLED(LIN_ADVANCE)