From 1fa5c5c720d1439fe0f5150ceaaeffe4dd4386f9 Mon Sep 17 00:00:00 2001
From: JTS <jts@defdist.org>
Date: Tue, 7 Jan 2020 17:57:21 -0500
Subject: [PATCH] Fixed Homing state bug

Fixed an issue where grbl's state machine gets corrupted.  For example, if "$H0abc" is sent, existing grbl sets sys.state=STATE_HOMING, but then bails out without actually homing.  Subsequent "$H" commands are then not executed, because grbl isn't idle (it still thinks it's homing).
---
 grbl/system.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/grbl/system.c b/grbl/system.c
index 55e6c406..c35a717e 100644
--- a/grbl/system.c
+++ b/grbl/system.c
@@ -179,12 +179,13 @@ uint8_t system_execute_line(char *line)
         case 'H' : // Perform homing cycle [IDLE/ALARM]
           if (bit_isfalse(settings.flags,BITFLAG_HOMING_ENABLE)) {return(STATUS_SETTING_DISABLED); }
           if (system_check_safety_door_ajar()) { return(STATUS_CHECK_DOOR); } // Block if safety door is ajar.
-          sys.state = STATE_HOMING; // Set system state variable
           if (line[2] == 0) {
+            sys.state = STATE_HOMING; // Set system state variable
             mc_homing_cycle(HOMING_CYCLE_ALL);
           #ifdef HOMING_SINGLE_AXIS_COMMANDS
             } else if (line[3] == 0) {
               switch (line[2]) {
+                sys.state = STATE_HOMING; // Set system state variable
                 case 'X': mc_homing_cycle(HOMING_CYCLE_X); break;
                 case 'Y': mc_homing_cycle(HOMING_CYCLE_Y); break;
                 case 'Z': mc_homing_cycle(HOMING_CYCLE_Z); break;