From 118899357d995c58de2089abb5f5da2d186aebe9 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <thinkyhead@users.noreply.github.com>
Date: Thu, 1 Mar 2018 02:10:43 -0600
Subject: [PATCH] Add sanity checks to Linear Advance 1.5 (#9873)

---
 Marlin/src/gcode/feature/advance/M900.cpp | 19 ++++++++++++-------
 Marlin/src/inc/SanityCheck.h              | 10 ++++++++++
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/Marlin/src/gcode/feature/advance/M900.cpp b/Marlin/src/gcode/feature/advance/M900.cpp
index 4f95ee8859..e9d5360a97 100644
--- a/Marlin/src/gcode/feature/advance/M900.cpp
+++ b/Marlin/src/gcode/feature/advance/M900.cpp
@@ -34,14 +34,19 @@
  *  K<factor>                  Set advance K factor
  */
 void GcodeSuite::M900() {
-    stepper.synchronize();
-
-    const float newK = parser.floatval('K', -1);
-    if (newK >= 0) planner.extruder_advance_K = newK;
-
+  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_ECHOPAIR("Advance K=", planner.extruder_advance_K);
-    SERIAL_EOL();
+    SERIAL_ECHOLNPAIR("Advance K=", planner.extruder_advance_K);
+  }
 }
 
 #endif // LIN_ADVANCE
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index af79dad8d3..ea56c3227c 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -554,6 +554,16 @@ 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
  */