From 951b65c2de4263a85fbcc8af14704be53a8c310a Mon Sep 17 00:00:00 2001
From: Sebastianv650 <sebastian.popp@vodafonemail.de>
Date: Thu, 1 Mar 2018 09:10:39 +0100
Subject: [PATCH] Add sanity checks to Linear Advance 1.5 (#9859)

---
 Marlin/Marlin_main.cpp | 21 +++++++++++++--------
 Marlin/SanityCheck.h   | 10 ++++++++++
 2 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 0df7b68af..ae9d86b2a 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -10469,14 +10469,19 @@ inline void gcode_M502() {
    *  K<factor>                  Set advance K factor
    */
   inline void gcode_M900() {
-    stepper.synchronize();
-
-    const float newK = parser.floatval('K', -1);
-    if (newK >= 0) planner.extruder_advance_K = newK;
-
-    SERIAL_ECHO_START();
-    SERIAL_ECHOPAIR("Advance K=", planner.extruder_advance_K);
-    SERIAL_EOL();
+    if (parser.seenval('K')) {
+      const float newK = parser.floatval('K');
+      if (WITHIN(newK, 0, 10)) {
+        stepper.synchronize();
+        planner.extruder_advance_K = newK;
+      }
+      else
+        SERIAL_PROTOCOLLNPGM("?K value out of range (0-10).");
+    }
+    else {
+      SERIAL_ECHO_START();
+      SERIAL_ECHOLNPAIR("Advance K=", planner.extruder_advance_K);
+    }
   }
 #endif // LIN_ADVANCE
 
diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index 38cfaaa82..4c4ae2447 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -527,6 +527,16 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
   #endif
 #endif
 
+/**
+ * Linear Advance 1.5 - Check K value range
+ */
+#if ENABLED(LIN_ADVANCE)
+  static_assert(
+    WITHIN(LIN_ADVANCE_K, 0, 10),
+    "LIN_ADVANCE_K must be a value from 0 to 10 (Changed in LIN_ADVANCE v1.5, Marlin 1.1.9)."
+  );
+#endif
+
 /**
  * Parking Extruder requirements
  */