Added digitalWrite(pin, TOGGLE)

Author: Lauszus

build/shared/lib/keywords.txt

@@ -1,7 +1,8 @@
 # LITERAL1 specifies constants
 
-HIGH	LITERAL1	Constants
 LOW	LITERAL1	Constants
+HIGH	LITERAL1	Constants
+TOGGLE	LITERAL1	Constants
 INPUT	LITERAL1	Constants
 INPUT_PULLUP	LITERAL1	Constants
 OUTPUT	LITERAL1	Constants

hardware/arduino/cores/arduino/Arduino.h

@@ -15,9 +15,10 @@
 extern "C"{
 #endif
 
-#define HIGH 0x1
 #define LOW  0x0
-
+#define HIGH 0x1
+#define TOGGLE 0x2
+    
 #define INPUT 0x0
 #define OUTPUT 0x1
 #define INPUT_PULLUP 0x2

hardware/arduino/cores/arduino/wiring_digital.c

@@ -152,11 +152,12 @@ void digitalWrite(uint8_t pin, uint8_t val)
 	uint8_t oldSREG = SREG;
 	cli();
 
-	if (val == LOW) {
+	if (val == LOW)
 		*out &= ~bit;
-	} else {
+    else if (val == TOGGLE)
+		*out ^= bit;
+    else
 		*out |= bit;
-	}
 
 	SREG = oldSREG;
 }