Support step motor controllers with active low step pins.

[marlin.git] / Marlin / Configuration_adv.h

diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 0d1e914ad393fbec4c1e1ca03cb7a8d7d6987c70..297c9df13e7a733e4aca3a370eeae1932f5c1a0c 100644 (file)
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -88,6 +88,12 @@
 
 #define MAX_STEP_FREQUENCY 40000 // Max step frequency for Ultimaker (5000 pps / half step)
 
+//By default pololu step drivers require an active high signal. However, some high power drivers require an active low signal as step.
+#define INVERT_X_STEP_PIN false
+#define INVERT_Y_STEP_PIN false
+#define INVERT_Z_STEP_PIN false
+#define INVERT_E_STEP_PIN false
+
 //default stepper release if idle
 #define DEFAULT_STEPPER_DEACTIVE_TIME 60