Smooth Linear Advance (Testing)

Marlin/Configuration_adv.h

@@ -2357,9 +2357,9 @@
 #define LIN_ADVANCE
 #if ENABLED(LIN_ADVANCE)
   #if ENABLED(DISTINCT_E_FACTORS)
-    #define ADVANCE_K { 0.00 }    // (mm) Compression length per 1mm/s extruder speed, per extruder
+    #define ADVANCE_K { 0.00 }      // (mm) Compression length per 1mm/s extruder speed, per extruder
   #else
-    #define ADVANCE_K 0.00        // (mm) Compression length applying to all extruders
+    #define ADVANCE_K 0.00          // (mm) Compression length applying to all extruders
   #endif
   //#define ADVANCE_K_EXTRA       // Add a second linear advance constant, configurable with M900 L.
   //#define LA_DEBUG              // Print debug information to serial during operation. Disable for production use.

Marlin/src/gcode/feature/advance/M900.cpp

@@ -164,6 +164,9 @@ void GcodeSuite::M900() {
           SERIAL_EOL();
         #endif
       #endif
+      #if ENABLED(SMOOTH_LIN_ADV)
+        SERIAL_ECHOLNPGM("Advance TAU=", Stepper::get_advance_tau());
+      #endif
 
     #endif // !ADVANCE_K_EXTRA
   }

Marlin/src/lcd/e3v2/proui/dwin.cpp

@@ -530,7 +530,7 @@ void DWIN_DrawStatusMessage() {
 void Draw_Print_Labels() {
   DWINUI::Draw_String( 46, 173, GET_TEXT_F(MSG_INFO_PRINT_TIME));
   DWINUI::Draw_String(181, 173, GET_TEXT_F(MSG_REMAINING_TIME));
-  TERN_(SHOW_INTERACTION_TIME, DWINUI::Draw_String(100, 215, F("Until Filament Change"));)
+  TERN_(SHOuW_INTERACTION_TIME, DWINUI::Draw_String(100, 215, F("Until Filament Change"));)
 }
 
 static uint8_t _percent_done = 100;

Marlin/src/lcd/menu/menu_tune.cpp

@@ -236,6 +236,11 @@ void menu_tune() {
     #endif
   #endif
 
+  #if ENABLED(SMOOTH_LIN_ADV)
+    editable.decimal = Stepper::get_advance_tau();
+    EDIT_ITEM(float54, MSG_ADVANCE_TAU, &editable.decimal, 0.0f, 0.5f, []{ Stepper::set_advance_tau(editable.decimal); });
+  #endif
+
   //
   // Nonlinear Extrusion state
   //

Marlin/src/module/planner.cpp

@@ -817,7 +817,7 @@ void Planner::calculate_trapezoid_for_block(block_t * const block, const_float_t
     uint32_t cruise_rate = block->nominal_rate;
   #endif
 
-  // Steps for acceleration, plateau and deceleration
+  // Steps for acceleration, plateau, and deceleration
   int32_t plateau_steps = block->step_event_count,
           accelerate_steps = 0,
           decelerate_steps = 0;
@@ -828,9 +828,11 @@ void Planner::calculate_trapezoid_for_block(block_t * const block, const_float_t
     inverse_accel = 1.0f / accel;
     const float half_inverse_accel = 0.5f * inverse_accel,
                 nominal_rate_sq = FLOAT_SQ(block->nominal_rate),
-                // Steps required for acceleration, deceleration to/from nominal rate
-                decelerate_steps_float = half_inverse_accel * (nominal_rate_sq - FLOAT_SQ(final_rate)),
-                accelerate_steps_float = half_inverse_accel * (nominal_rate_sq - FLOAT_SQ(initial_rate));
+                initial_rate_sq = FLOAT_SQ(initial_rate),
+                final_rate_sq = FLOAT_SQ(final_rate),
+                // Steps required for acceleration and deceleration to/from nominal rate
+                decelerate_steps_float = half_inverse_accel * (nominal_rate_sq - final_rate_sq),
+                accelerate_steps_float = half_inverse_accel * (nominal_rate_sq - initial_rate_sq);
     // Aims to fully reach nominal and final rates
     accelerate_steps = CEIL(accelerate_steps_float);
     decelerate_steps = CEIL(decelerate_steps_float);
@@ -856,7 +858,7 @@ void Planner::calculate_trapezoid_for_block(block_t * const block, const_float_t
 
   #if ANY(S_CURVE_ACCELERATION, SMOOTH_LIN_ADVANCE)
     const float rate_factor = inverse_accel * (STEPPER_TIMER_RATE);
-    // Jerk controlled speed requires to express speed versus time, NOT steps
+    // Jerk-controlled speed requires expressing speed versus time, NOT steps
     uint32_t acceleration_time = rate_factor * float(cruise_rate - initial_rate),
              deceleration_time = rate_factor * float(cruise_rate - final_rate);
   #endif
@@ -893,6 +895,12 @@ void Planner::calculate_trapezoid_for_block(block_t * const block, const_float_t
     }
   #endif
 
+  #if ENABLED(LA_DEBUG)
+    SERIAL_ECHOLNPAIR("Accelerate Steps: ", accelerate_steps);
+    SERIAL_ECHOLNPAIR("Decelerate Steps: ", decelerate_steps);
+    SERIAL_ECHOLNPAIR("Plateau Steps: ", plateau_steps);
+  #endif
+
   #if ENABLED(LASER_POWER_TRAP)
     /**
      * Laser Trapezoid Calculations

Marlin/src/module/settings.cpp

@@ -2463,7 +2463,7 @@ void MarlinSettings::postprocess() {
         #endif
         EEPROM_READ(lpq_len);
       }
-     // #endif
+      // #endif
 
       //
       // PIDTEMPBED
@@ -2582,7 +2582,7 @@ void MarlinSettings::postprocess() {
       //
       // Firmware Retraction
       //
-     // #if ENABLED(FWRETRACT)
+      // #if ENABLED(FWRETRACT)
       {
         _FIELD_TEST(fwretract_settings);
         fwretract_settings_t fwretract_settings;
@@ -2800,6 +2800,14 @@ void MarlinSettings::postprocess() {
           if (!validating)
             DISTINCT_E_LOOP() stepper.set_advance_tau(tau[e], e);
         #endif
+
+        #if ENABLED(SMOOTH_LIN_ADV)
+          float extruder_advance_TAU;
+          EEPROM_READ(extruder_advance_TAU);
+          if (!validating) {
+            Stepper::set_advance_tau(extruder_advance_TAU);
+          }
+        #endif
       }
       #endif