Set default pinMode for CHANGE (#84)

Author: rmlearney-digicatapult

cores/arduino/Interrupts.cpp

@@ -69,10 +69,16 @@ void attachInterruptParam(pin_size_t interruptNum, voidFuncPtrParam func, PinSta
   digitalPinToInterruptObj(interruptNum) = irq;
   // Give a default pullup for the pin, since calling InterruptIn with PinMode is impossible
   if (digitalPinToGpio(interruptNum) == NULL) {
-    pinMode(interruptNum, mode == FALLING ? INPUT_PULLUP : INPUT_PULLDOWN);
+    if (mode == FALLING) {
+      pinMode(interruptNum, INPUT_PULLUP);
+    } else if (mode == RISING) {
+      pinMode(interruptNum, INPUT_PULLDOWN);
+    } else {
+      pinMode(interruptNum, INPUT);
+    }
   }
 }
 
 void attachInterrupt(pin_size_t interruptNum, voidFuncPtr func, PinStatus mode) {
   attachInterruptParam(interruptNum, (voidFuncPtrParam)func, mode, NULL);
-}
+}