Clean up port, pin, and pin mask duplication in digitalWrite

cores/arduino/wiring_digital.c

@@ -82,19 +82,23 @@ void digitalWrite( uint32_t ulPin, uint32_t ulVal )
     return ;
   }
 
-  if ( (PORT->Group[g_APinDescription[ulPin].ulPort].DIRSET.reg & (1ul << g_APinDescription[ulPin].ulPin)) == 0 ) {
+  EPortType port = g_APinDescription[ulPin].ulPort;
+  uint32_t pin = g_APinDescription[ulPin].ulPin;
+  uint32_t pinMask = (1ul << pin);
+
+  if ( (PORT->Group[port].DIRSET.reg & pinMask) == 0 ) {
     // the pin is not an output, disable pull-up if val is LOW, otherwise enable pull-up
-    PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].bit.PULLEN = (ulVal != LOW) ;
+    PORT->Group[port].PINCFG[pin].bit.PULLEN = (ulVal != LOW) ;
   }
 
   switch ( ulVal )
   {
     case LOW:
-      PORT->Group[g_APinDescription[ulPin].ulPort].OUTCLR.reg = (1ul << g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].OUTCLR.reg = pinMask;
     break ;
 
     default:
-      PORT->Group[g_APinDescription[ulPin].ulPort].OUTSET.reg = (1ul << g_APinDescription[ulPin].ulPin) ;
+      PORT->Group[port].OUTSET.reg = pinMask;
     break ;
   }