Adding A0=14, A1=15, etc. aliases for analog input pins and modifying analogRead() to accept them (in addition to 0, 1, 2, etc.). Removing some unused code elsewhere.

1 files changed, 9 insertions, 5 deletions

diff --git a/cores/arduino/wiring_analog.c b/cores/arduino/wiring_analog.c
index 529ad52..63be477 100755
--- a/cores/arduino/wiring_analog.c
+++ b/cores/arduino/wiring_analog.c
@@ -39,16 +39,20 @@ int analogRead(uint8_t pin)
 {
 	uint8_t low, high;
 
-	// set the analog reference (high two bits of ADMUX) and select the
-	// channel (low 4 bits).  this also sets ADLAR (left-adjust result)
-	// to 0 (the default).
-	ADMUX = (analog_reference << 6) | (pin & 0x07);
-  
 #if defined(__AVR_ATmega1280__)
+	if (pin >= 54) pin -= 54; // allow for channel or pin numbers
+
 	// the MUX5 bit of ADCSRB selects whether we're reading from channels
 	// 0 to 7 (MUX5 low) or 8 to 15 (MUX5 high).
 	ADCSRB = (ADCSRB & ~(1 << MUX5)) | (((pin >> 3) & 0x01) << MUX5);
+#else
+	if (pin >= 14) pin -= 14; // allow for channel or pin numbers
 #endif
+  
+	// set the analog reference (high two bits of ADMUX) and select the
+	// channel (low 4 bits).  this also sets ADLAR (left-adjust result)
+	// to 0 (the default).
+	ADMUX = (analog_reference << 6) | (pin & 0x07);
 
 	// without a delay, we seem to read from the wrong channel
 	//delay(1);