FILAMENT_RUNOUT_SENSOR pullup/pulldown

Marlin/Configuration.h

@@ -1527,8 +1527,12 @@
   #define FIL_RUNOUT_ENABLED_DEFAULT false // Enable the sensor on startup. Override with M412 followed by M500.
   #define NUM_RUNOUT_SENSORS   1          // Number of sensors, up to one per extruder. Define a FIL_RUNOUT#_PIN for each.
   #define FIL_RUNOUT_STATE     FIL_RUNOUT_LEVEL // Pin state indicating that filament is NOT present.
+  
+  #if FIL_RUNOUT_LEVEL==LOW
   #define FIL_RUNOUT_PULLUP               // Use internal pullup for filament runout pins.
-  //#define FIL_RUNOUT_PULLDOWN           // Use internal pulldown for filament runout pins.
+  #else
+  #define FIL_RUNOUT_PULLDOWN           // Use internal pulldown for filament runout pins.
+  #endif
   //#define WATCH_ALL_RUNOUT_SENSORS      // Execute runout script on any triggering sensor, not only for the active extruder.
                                           // This is automatically enabled for MIXING_EXTRUDERs.