Added pinToInterrupt() variant macro (Paul Stoffregen)

Author: cmaglie

Diff for: variants/leonardo/pins_arduino.h

@@ -132,6 +132,8 @@ static const uint8_t A11 = 29;	// D12
 extern const uint8_t PROGMEM analog_pin_to_channel_PGM[];
 #define analogPinToChannel(P)  ( pgm_read_byte( analog_pin_to_channel_PGM + (P) ) )
 
+#define digitalPinToInterrupt(p) ((p) == 0 ? 2 : ((p) == 1 ? 3 : ((p) == 2 ? 1 : ((p) == 3 ? 0 : ((p) == 7 ? 4 : -1)))))
+
 #ifdef ARDUINO_MAIN
 
 // On the Arduino board, digital pins are also used

Diff for: variants/mega/pins_arduino.h

@@ -83,6 +83,8 @@ static const uint8_t A15 = 69;
                                 ( (((p) >= 62) && ((p) <= 69)) ? ((p) - 62) : \
                                 0 ) ) ) ) ) )
 
+#define digitalPinToInterrupt(p) ((p) == 2 ? 0 : ((p) == 3 ? 1 : ((p) >= 18 && (p) <= 21 ? 23 - (p) : -1)))
+
 #ifdef ARDUINO_MAIN
 
 const uint16_t PROGMEM port_to_mode_PGM[] = {
@@ -360,4 +362,4 @@ const uint8_t PROGMEM digital_pin_to_timer_PGM[] = {
 
 #endif
 
-#endif
+#endif

Diff for: variants/standard/pins_arduino.h

@@ -60,6 +60,8 @@ static const uint8_t A7 = 21;
 #define digitalPinToPCMSK(p)    (((p) <= 7) ? (&PCMSK2) : (((p) <= 13) ? (&PCMSK0) : (((p) <= 21) ? (&PCMSK1) : ((uint8_t *)0))))
 #define digitalPinToPCMSKbit(p) (((p) <= 7) ? (p) : (((p) <= 13) ? ((p) - 8) : ((p) - 14)))
 
+#define digitalPinToInterrupt(p)  ((p) == 2 ? 0 : ((p) == 3 ? 1 : -1))
+
 #ifdef ARDUINO_MAIN
 
 // On the Arduino board, digital pins are also used