From 68d91522c67358be9eb0dfef4d688cedee38d9df Mon Sep 17 00:00:00 2001
From: Brian <bgort@users.noreply.github.com>
Date: Fri, 10 Aug 2018 09:39:10 -0400
Subject: [PATCH] fixes gremlin where changing stepper direction mask didn't
 work correctly because step_port_invert_mask[] (new with the RAMPS
 modifications) wasn't reset to 0 when it should have been.  this made a mess.

---
 grbl/stepper.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/grbl/stepper.c b/grbl/stepper.c
index d0fc3aa..62c2860 100644
--- a/grbl/stepper.c
+++ b/grbl/stepper.c
@@ -596,7 +596,10 @@ void st_generate_step_dir_invert_masks()
   #ifdef DEFAULTS_RAMPS_BOARD
     for (idx=0; idx<N_AXIS; idx++) {
       if (bit_istrue(settings.step_invert_mask,bit(idx))) { step_port_invert_mask[idx] = get_step_pin_mask(idx); }
+      else { step_port_invert_mask[idx] = 0; }
+
       if (bit_istrue(settings.dir_invert_mask,bit(idx))) { dir_port_invert_mask[idx] = get_direction_pin_mask(idx); }
+      else { dir_port_invert_mask[idx] = 0; }
     }
   #else
     step_port_invert_mask = 0;