Import grbl v1.1h
diff --git a/grbl/limits.h b/grbl/limits.h
new file mode 100644
index 0000000..33fe095
--- /dev/null
+++ b/grbl/limits.h
@@ -0,0 +1,41 @@
+/*
+ limits.h - code pertaining to limit-switches and performing the homing cycle
+ Part of Grbl
+
+ Copyright (c) 2012-2016 Sungeun K. Jeon for Gnea Research LLC
+ Copyright (c) 2009-2011 Simen Svale Skogsrud
+
+ Grbl is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Grbl is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Grbl. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef limits_h
+#define limits_h
+
+
+// Initialize the limits module
+void limits_init();
+
+// Disables hard limits.
+void limits_disable();
+
+// Returns limit state as a bit-wise uint8 variable.
+uint8_t limits_get_state();
+
+// Perform one portion of the homing cycle based on the input settings.
+void limits_go_home(uint8_t cycle_mask);
+
+// Check for soft limit violations
+void limits_soft_check(float *target);
+
+#endif