From ac7e97f4feb8310681a330d757d414c132e6563a Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Fri, 30 Mar 2018 15:07:11 -0500
Subject: [PATCH] Change order of inactive stepper disable/enable

This ensures that steppers that share an enable pin will only be disabled for a miniscule time.
---
 Marlin/src/module/planner.cpp | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index f00798d992..7c8051770d 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -939,16 +939,8 @@ void Planner::_buffer_steps(const int32_t (&target)[XYZE]
       for (uint8_t i = 0; i < EXTRUDERS; i++)
         if (g_uc_extruder_last_move[i] > 0) g_uc_extruder_last_move[i]--;
 
-      switch(extruder) {
+      switch (extruder) {
         case 0:
-          enable_E0();
-          g_uc_extruder_last_move[0] = (BLOCK_BUFFER_SIZE) * 2;
-          #if ENABLED(DUAL_X_CARRIAGE) || ENABLED(DUAL_NOZZLE_DUPLICATION_MODE)
-            if (extruder_duplication_enabled) {
-              enable_E1();
-              g_uc_extruder_last_move[1] = (BLOCK_BUFFER_SIZE) * 2;
-            }
-          #endif
           #if EXTRUDERS > 1
             DISABLE_IDLE_E(1);
             #if EXTRUDERS > 2
@@ -961,11 +953,17 @@ void Planner::_buffer_steps(const int32_t (&target)[XYZE]
               #endif // EXTRUDERS > 3
             #endif // EXTRUDERS > 2
           #endif // EXTRUDERS > 1
+          enable_E0();
+          g_uc_extruder_last_move[0] = (BLOCK_BUFFER_SIZE) * 2;
+          #if ENABLED(DUAL_X_CARRIAGE) || ENABLED(DUAL_NOZZLE_DUPLICATION_MODE)
+            if (extruder_duplication_enabled) {
+              enable_E1();
+              g_uc_extruder_last_move[1] = (BLOCK_BUFFER_SIZE) * 2;
+            }
+          #endif
         break;
         #if EXTRUDERS > 1
           case 1:
-            enable_E1();
-            g_uc_extruder_last_move[1] = (BLOCK_BUFFER_SIZE) * 2;
             DISABLE_IDLE_E(0);
             #if EXTRUDERS > 2
               DISABLE_IDLE_E(2);
@@ -976,11 +974,11 @@ void Planner::_buffer_steps(const int32_t (&target)[XYZE]
                 #endif // EXTRUDERS > 4
               #endif // EXTRUDERS > 3
             #endif // EXTRUDERS > 2
+            enable_E1();
+            g_uc_extruder_last_move[1] = (BLOCK_BUFFER_SIZE) * 2;
           break;
           #if EXTRUDERS > 2
             case 2:
-              enable_E2();
-              g_uc_extruder_last_move[2] = (BLOCK_BUFFER_SIZE) * 2;
               DISABLE_IDLE_E(0);
               DISABLE_IDLE_E(1);
               #if EXTRUDERS > 3
@@ -989,26 +987,28 @@ void Planner::_buffer_steps(const int32_t (&target)[XYZE]
                   DISABLE_IDLE_E(4);
                 #endif
               #endif
+              enable_E2();
+              g_uc_extruder_last_move[2] = (BLOCK_BUFFER_SIZE) * 2;
             break;
             #if EXTRUDERS > 3
               case 3:
-                enable_E3();
-                g_uc_extruder_last_move[3] = (BLOCK_BUFFER_SIZE) * 2;
                 DISABLE_IDLE_E(0);
                 DISABLE_IDLE_E(1);
                 DISABLE_IDLE_E(2);
                 #if EXTRUDERS > 4
                   DISABLE_IDLE_E(4);
                 #endif
+                enable_E3();
+                g_uc_extruder_last_move[3] = (BLOCK_BUFFER_SIZE) * 2;
               break;
               #if EXTRUDERS > 4
                 case 4:
-                  enable_E4();
-                  g_uc_extruder_last_move[4] = (BLOCK_BUFFER_SIZE) * 2;
                   DISABLE_IDLE_E(0);
                   DISABLE_IDLE_E(1);
                   DISABLE_IDLE_E(2);
                   DISABLE_IDLE_E(3);
+                  enable_E4();
+                  g_uc_extruder_last_move[4] = (BLOCK_BUFFER_SIZE) * 2;
                 break;
               #endif // EXTRUDERS > 4
             #endif // EXTRUDERS > 3