Add minimum step dir delay option, A4988 pulse note (#11122)

Co-Authored-By: ejtagle <ejtagle@hotmail.com>

Marlin/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/AlephObjects/TAZ4/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Anet/A6/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Anet/A8/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/BIBO/TouchX/default/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/BQ/Hephestos/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/BQ/Hephestos_2/Configuration_adv.h

@@ -816,9 +816,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/BQ/WITBOX/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Cartesio/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Creality/CR-10/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Creality/CR-10S/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Creality/CR-10mini/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Creality/CR-8/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Creality/Ender-2/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Creality/Ender-3/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Creality/Ender-4/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Felix/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/FolgerTech/i3-2020/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Geeetech/Prusa i3 Pro C/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Geeetech/Prusa i3 Pro W/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Infitary/i3-M508/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/JGAurora/A5/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Malyan/M150/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Micromake/C1/enhanced/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/RigidBot/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/SCARA/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Sanguinololu/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/TinyBoy2/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Velleman/K8200/Configuration_adv.h

@@ -811,9 +811,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Velleman/K8400/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/Wanhao/Duplicator 6/Configuration_adv.h

@@ -810,9 +810,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h

@@ -810,9 +810,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/delta/FLSUN/kossel/Configuration_adv.h

@@ -810,9 +810,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h

@@ -810,9 +810,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/delta/generic/Configuration_adv.h

@@ -810,9 +810,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h

@@ -810,9 +810,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h

@@ -815,9 +815,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h

@@ -810,9 +810,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/gCreate/gMax1.5+/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/makibox/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h

@@ -808,9 +808,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/example_configurations/wt150/Configuration_adv.h

@@ -809,9 +809,22 @@
 // Moves (or segments) with fewer steps than this will be joined with the next move
 #define MIN_STEPS_PER_SEGMENT 6
 
+/**
+ * Minimum delay after setting the stepper DIR (in ns)
+ *    0 : No delay (Expect at least 10µS since one Stepper ISR must transpire)
+ *   20 : Minimum for TMC2xxx drivers
+ *  200 : Minimum for A4988 drivers
+ *  500 : Minimum for LV8729 drivers (guess, no info in datasheet)
+ *  650 : Minimum for DRV8825 drivers
+ * 1500 : Minimum for TB6600 drivers (guess, no info in datasheet)
+ *15000 : Minimum for TB6560 drivers (guess, no info in datasheet)
+ */
+#define MINIMUM_STEPPER_DIR_DELAY 0
+
 /**
  * Minimum stepper driver pulse width (in µs)
  *   0 : Smallest possible width the MCU can produce, compatible with TMC2xxx drivers
+ *   1 : Minimum for A4988 stepper drivers
  *   1 : Minimum for LV8729 stepper drivers
  *   2 : Minimum for DRV8825 stepper drivers
  *   3 : Minimum for TB6600 stepper drivers

Marlin/planner.h

@@ -688,7 +688,7 @@ class Planner {
      */
     FORCE_INLINE static void discard_current_block() {
       if (has_blocks_queued()) { // Discard non-empty buffer.
-        uint8_t block_index = next_block_index( block_buffer_tail );
+        uint8_t block_index = next_block_index(block_buffer_tail);
 
         // Push block_buffer_planned pointer, if encountered.
         if (!has_blocks_queued()) block_buffer_planned = block_index;

Marlin/stepper.cpp

@@ -379,6 +379,11 @@ void Stepper::set_directions() {
       }
     #endif
   #endif // !LIN_ADVANCE
+
+  // A small delay may be needed after changing direction
+  #if MINIMUM_STEPPER_DIR_DELAY > 0
+    DELAY_NS(MINIMUM_STEPPER_DIR_DELAY);
+  #endif
 }
 
 #if ENABLED(S_CURVE_ACCELERATION)