digitalWrite() is embarassingly slow on Due...

[WestfW]

There's a relatively senseless use of Atmel Libraries that duplicate a lot of the effort. The attached patch approximately doubles the speed of a pin-toggle loop...
(umm. I can't attach a diff...)

--- wiring_digital.c~   2015-04-23 08:30:36.000000000 -0700
+++ wiring_digital.c    2015-10-26 20:59:25.000000000 -0700
@@ -84,7 +84,12 @@
   }
   else
   {
-    PIO_SetOutput( g_APinDescription[ulPin].pPort, g_APinDescription[ulPin].ulPin, ulVal, 0, PIO_PULLUP ) ;
+      if (ulVal) {
+     digitalPinToPort(ulPin)->PIO_SODR = digitalPinToBitMask(ulPin);
+      } else {
+     digitalPinToPort(ulPin)->PIO_CODR = digitalPinToBitMask(ulPin);
+      }
+//    PIO_SetOutput( g_APinDescription[ulPin].pPort, g_APinDescription[ulPin].ulPin, ulVal, 0, PIO_PULLUP ) ;
   }
 }

[archenemies]

Seems like a useful patch

[agdl]

This issue was moved to arduino/ArduinoCore-sam#16

[dsyleixa]

@WestfW
will this patch be fixed/integrated in the next official board core? (currently 1.6.11)?