Merge pull request #5300 from mischnic/attiny_anlReference

Add all analog references supported by the ATtinyX5 series

Author: sandeepmistry

cores/arduino/Arduino.h

@@ -61,10 +61,18 @@ void yield(void);
 #define FALLING 2
 #define RISING 3
 
-#if defined(__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
-#define DEFAULT 0
-#define EXTERNAL 1
-#define INTERNAL 2
+#if defined(__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
+  #define DEFAULT 0
+  #define EXTERNAL 1
+  #define INTERNAL1V1 2
+  #define INTERNAL INTERNAL1V1
+#elif defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
+  #define DEFAULT 0
+  #define EXTERNAL 4
+  #define INTERNAL1V1 8
+  #define INTERNAL INTERNAL1V1
+  #define INTERNAL2V56 9
+  #define INTERNAL2V56_EXTCAP 13
 #else  
 #if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__)
 #define INTERNAL1V1 2

cores/arduino/wiring_analog.c

@@ -64,7 +64,11 @@ int analogRead(uint8_t pin)
 	// channel (low 4 bits).  this also sets ADLAR (left-adjust result)
 	// to 0 (the default).
 #if defined(ADMUX)
+#if defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
+	ADMUX = (analog_reference << 4) | (pin & 0x07);
+#else
 	ADMUX = (analog_reference << 6) | (pin & 0x07);
+#endif
 #endif
 
 	// without a delay, we seem to read from the wrong channel