From 4201d165e1d1659f625cf7b3e07cde7f423cfadc Mon Sep 17 00:00:00 2001
From: shitcreek <luulac85@gmail.com>
Date: Thu, 5 Dec 2019 21:19:27 -0600
Subject: [PATCH] Add condition for frequency limit - fixes issues with laser

The frequency limit causes blurry raster engraving (https://github.com/MarlinFirmware/Marlin/issues/16058) and for the new yet to be merged laser improvements PR (https://github.com/MarlinFirmware/Marlin/pull/15335), it causes the laser to stay on after a job has finished
---
 Marlin/Configuration_adv.h |  8 ++++++++
 Marlin/src/Marlin.cpp      | 14 +++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 0717a3ac5489..b9604b3ad392 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -320,6 +320,14 @@
 #define TEMP_SENSOR_AD8495_OFFSET 0.0
 #define TEMP_SENSOR_AD8495_GAIN   1.0
 
+/**
+ * 
+ * Limit check_axes_activity frequency to 10Hz
+ * Affects M106
+ * Undefine this if laser engraving with M106 produces blurry results
+*/
+// #define LIMIT_FREQUENCY
+
 /**
  * Controller Fan
  * To cool down the stepper drivers and MOSFETs.
diff --git a/Marlin/src/Marlin.cpp b/Marlin/src/Marlin.cpp
index 2198672ff875..09d997f1ac48 100644
--- a/Marlin/src/Marlin.cpp
+++ b/Marlin/src/Marlin.cpp
@@ -608,12 +608,16 @@ void manage_inactivity(const bool ignore_stepper_queue/*=false*/) {
     L6470.monitor_driver();
   #endif
 
-  // Limit check_axes_activity frequency to 10Hz
-  static millis_t next_check_axes_ms = 0;
-  if (ELAPSED(ms, next_check_axes_ms)) {
+// Limit check_axes_activity frequency to 10Hz
+  #if ENABLED(LIMIT_FREQUENCY)
+    static millis_t next_check_axes_ms = 0;
+    if (ELAPSED(ms, next_check_axes_ms)) {
+      planner.check_axes_activity();
+      next_check_axes_ms = ms + 100UL;
+    }
+  #else
     planner.check_axes_activity();
-    next_check_axes_ms = ms + 100UL;
-  }
+  #endif
 
   #if PIN_EXISTS(FET_SAFETY)
     static millis_t FET_next;