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-rw-r--r--variants/standard/pins_arduino.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/variants/standard/pins_arduino.h b/variants/standard/pins_arduino.h
index b024ca1..815df3c 100644
--- a/variants/standard/pins_arduino.h
+++ b/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 : NOT_AN_INTERRUPT))
+
#ifdef ARDUINO_MAIN
// On the Arduino board, digital pins are also used