From ad28da7eb4fe720776daf929d0a25ba39e6b6ca8 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Fri, 1 Nov 2019 15:38:41 -0500
Subject: [PATCH] Patch ABL G29 loop

Followup to e3ddf6e81a
---
 Marlin/src/gcode/bedlevel/abl/G29.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Marlin/src/gcode/bedlevel/abl/G29.cpp b/Marlin/src/gcode/bedlevel/abl/G29.cpp
index c3e52fe3f..c17150f79 100644
--- a/Marlin/src/gcode/bedlevel/abl/G29.cpp
+++ b/Marlin/src/gcode/bedlevel/abl/G29.cpp
@@ -684,7 +684,7 @@ G29_TYPE GcodeSuite::G29() {
       // Outer loop is Y with PROBE_Y_FIRST disabled
       for (PR_OUTER_VAR = 0; PR_OUTER_VAR < PR_OUTER_END && !isnan(measured_z); PR_OUTER_VAR++) {
 
-        int8_t inStart, inStop, inInc;
+        uint8_t inStart, inStop, inInc;
 
         if (zig) { // away from origin
           inStart = 0;
@@ -693,8 +693,8 @@ G29_TYPE GcodeSuite::G29() {
         }
         else {     // towards origin
           inStart = PR_INNER_END - 1;
-          inStop = -1;
-          inInc = -1;
+          inStop = 0xFF;
+          inInc = 0xFF;
         }
 
         zig ^= true; // zag