From 447dbd6fa56691cc6a15276770d01f0e80c1fbe2 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <sourcetree@thinkyhead.com>
Date: Fri, 10 Jul 2015 18:15:24 -0700
Subject: [PATCH] Add STEPPER_RESET_PIN support

---
 Marlin/Conditionals.h  |  1 +
 Marlin/Marlin_main.cpp | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/Marlin/Conditionals.h b/Marlin/Conditionals.h
index 637ea98a5..1c191a3bb 100644
--- a/Marlin/Conditionals.h
+++ b/Marlin/Conditionals.h
@@ -442,6 +442,7 @@
   #define HAS_MICROSTEPS_E0 (PIN_EXISTS(E0_MS1))
   #define HAS_MICROSTEPS_E1 (PIN_EXISTS(E1_MS1))
   #define HAS_MICROSTEPS_E2 (PIN_EXISTS(E2_MS1))
+  #define HAS_STEPPER_RESET (PIN_EXISTS(STEPPER_RESET))
   #define HAS_X_ENABLE (PIN_EXISTS(X_ENABLE))
   #define HAS_X2_ENABLE (PIN_EXISTS(X2_ENABLE))
   #define HAS_Y_ENABLE (PIN_EXISTS(Y_ENABLE))
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 0d4ddc9ec..0bfba2c83 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -579,6 +579,17 @@ void servo_init() {
   #endif
 }
 
+/**
+ * Stepper Reset (RigidBoard, et.al.)
+ */
+#if HAS_STEPPER_RESET
+  void disableStepperDrivers() {
+    pinMode(STEPPER_RESET_PIN, OUTPUT);
+    digitalWrite(STEPPER_RESET_PIN, LOW);  // drive it down to hold in reset motor driver chips
+  }
+  void enableStepperDrivers() { pinMode(STEPPER_RESET_PIN, INPUT); }  // set to input, which allows it to be pulled high by pullups
+#endif
+
 /**
  * Marlin entry-point: Set up before the program loop
  *  - Set up the kill pin, filament runout, power hold
@@ -601,6 +612,11 @@ void setup() {
   setup_killpin();
   setup_filrunoutpin();
   setup_powerhold();
+
+  #if HAS_STEPPER_RESET
+    disableStepperDrivers();
+  #endif
+
   MYSERIAL.begin(BAUDRATE);
   SERIAL_PROTOCOLLNPGM("start");
   SERIAL_ECHO_START;
@@ -656,6 +672,10 @@ void setup() {
     SET_OUTPUT(CONTROLLERFAN_PIN); //Set pin used for driver cooling fan
   #endif
 
+  #if HAS_STEPPER_RESET
+    enableStepperDrivers();
+  #endif
+
   #ifdef DIGIPOT_I2C
     digipot_i2c_init();
   #endif