shrink Feather M4 by ignoring unused pins

Author: dhalbert

ports/atmel-samd/boards/feather_m4_express/mpconfigboard.h

@@ -28,6 +28,20 @@
 #define DEFAULT_UART_BUS_RX (&pin_PB17)
 #define DEFAULT_UART_BUS_TX (&pin_PB16)
 
+// Used for 32 kHZ crystal
+#define IGNORE_PIN_PA00     1
+#define IGNORE_PIN_PA01     1
+
 // USB is always used internally so skip the pin objects for it.
 #define IGNORE_PIN_PA24     1
 #define IGNORE_PIN_PA25     1
+
+// Not connected
+#define IGNORE_PIN_PA15     1
+#define IGNORE_PIN_PA27     1
+#define IGNORE_PIN_PB00     1
+#define IGNORE_PIN_PB04     1
+#define IGNORE_PIN_PB06     1
+#define IGNORE_PIN_PB07     1
+#define IGNORE_PIN_PB30     1
+#define IGNORE_PIN_PB31     1