Individual control pin invert compile-option.

- Control pins may be individually inverted through a
CONTROL_INVERT_MASK macro. This mask is define in the cpu_map.h file.

doc/log/commit_log_v0.9i.txt

@@ -1,3 +1,13 @@
+----------------
+Date: 2015-07-17
+Author: Sonny Jeon
+Subject: Version bump to v0.9j
+
+- Version bump requested by OEMs to easily determine whether the
+firmware supports the new EEPROM reset feature. Other than that, no
+significant changes.
+
+
 ----------------
 Date: 2015-06-25
 Author: Sonny Jeon

grbl/config.h

@@ -153,8 +153,9 @@
 
 // Inverts pin logic of the control command pins. This essentially means when this option is enabled
 // you can use normally-closed switches, rather than the default normally-open switches.
-// NOTE: Will eventually be added to Grbl settings in v1.0.
-// #define INVERT_CONTROL_PIN // Default disabled. Uncomment to enable.
+// NOTE: If you require individual control pins inverted, keep this macro disabled and simply alter
+//   the CONTROL_INVERT_MASK definition in cpu_map.h files.
+// #define INVERT_ALL_CONTROL_PINS // Default disabled. Uncomment to enable.
 
 // Inverts the spindle enable pin from low-disabled/high-enabled to low-enabled/high-disabled. Useful
 // for some pre-built electronic boards.

grbl/cpu_map/cpu_map_atmega2560.h

@@ -108,6 +108,7 @@
 #define CONTROL_INT_vect  PCINT2_vect
 #define CONTROL_PCMSK     PCMSK2 // Pin change interrupt register
 #define CONTROL_MASK ((1<<RESET_BIT)|(1<<FEED_HOLD_BIT)|(1<<CYCLE_START_BIT)|(1<<SAFETY_DOOR_BIT))
+#define CONTROL_INVERT_MASK CONTROL_MASK // May be re-defined to only invert certain control pins.
 
 // Define probe switch input pin.
 #define PROBE_DDR       DDRK

grbl/cpu_map/cpu_map_atmega328p.h

@@ -117,6 +117,7 @@
 #define CONTROL_INT_vect  PCINT1_vect
 #define CONTROL_PCMSK     PCMSK1 // Pin change interrupt register
 #define CONTROL_MASK ((1<<RESET_BIT)|(1<<FEED_HOLD_BIT)|(1<<CYCLE_START_BIT)|(1<<SAFETY_DOOR_BIT))
+#define CONTROL_INVERT_MASK CONTROL_MASK // May be re-defined to only invert certain control pins.
   
 // Define probe switch input pin.
 #define PROBE_DDR       DDRC

grbl/grbl.h

@@ -23,7 +23,7 @@
 
 // Grbl versioning system
 #define GRBL_VERSION "0.9j"
-#define GRBL_VERSION_BUILD "20150717"
+#define GRBL_VERSION_BUILD "20150811"
 
 // Define standard libraries used by Grbl.
 #include <avr/io.h>

grbl/system.c

@@ -41,8 +41,8 @@ void system_init()
 ISR(CONTROL_INT_vect) 
 {
   uint8_t pin = (CONTROL_PIN & CONTROL_MASK);
-  #ifndef INVERT_CONTROL_PIN
-    pin ^= CONTROL_MASK;
+  #ifndef INVERT_ALL_CONTROL_PINS
+    pin ^= CONTROL_INVERT_MASK;
   #endif
   // Enter only if any CONTROL pin is detected as active.
   if (pin) {