minor tweeks for 32e5, warning removal

Author: bombasticbob

cores/xmega/wiring_analog.c

@@ -348,7 +348,7 @@ uint8_t mode;
       negpin = analogInputToAnalogPin(negpin + A0); // calc pin number (might not have 0 mapped to A0)
 #endif // analogInputToAnalogPin
     }
-    
+
     if(negpin >= 0 && negpin <= 3)
     {
       mode = ADC_CH_INPUTMODE_DIFFWGAINL_gc;
@@ -364,6 +364,10 @@ uint8_t mode;
       negpin -= 4; // so that it's 0-3
     }
   }
+  else
+  {
+    mode = ADC_CH_INPUTMODE_DIFFWGAINL_gc; // see 24.15.2 section on 'MUXNEG' when using INTERNAL GND or PAD GND
+  }
 
 #else // NOT an 'E5'
 
@@ -391,11 +395,11 @@ uint8_t mode;
       negpin = analogInputToAnalogPin(negpin + A0); // calc pin number (might not have 0 mapped to A0)
 #endif // analogInputToAnalogPin
     }
-    
+
 
     if(negpin >= 0 && negpin <= 3 && gain != ADC_CH_GAIN_1X_gc) // allow this *IF* gain is 1X
     {
-      return 0; // dis-allowed combination      
+      return 0; // dis-allowed combination
     }
     else if(negpin >= 0 && negpin <= 3)
     {

variants/xmega32e5/pins_arduino.h

@@ -126,9 +126,6 @@
 
 // the first macro, 'digitalPinToInterrupt', is for the 'interruptNum' parameter in 'attachInterrupt' and 'detachInterrupt'
 // the second macro, 'digitalPinToIntMode', is for the 'mode' parameter in 'attachInterrupt'.
-//#define digitalPinToInterrupt(p) \  this is an old attempt, leaving here for reference [for now]
-//  { register uint8_t uiPort = pgm_read_byte((&digital_pin_to_port_PGM[p])); \
-//    uiPort == _PD ? PORTD_INT0 : uiPort == _PC ? PORTC_INT0 : uiPort == _PA ? PORTA_INT0 : uiPort == _PR ? PORTR_INT0 : -1; }
 
 #define digitalPinToInterrupt(p) \
   ( pgm_read_byte(&port_to_int0_PGM[pgm_read_byte(&digital_pin_to_port_PGM[p])]) | \