Add analouge pin definitions

Author: hlovdal

cpp/arduino/ArduinoDefines.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <stdint.h>
 #include <avr/pgmspace.h>
 
 #define HIGH 0x1
@@ -91,4 +92,23 @@
 
 #if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega328__) || defined(__AVR_ATmega168__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
   #define LED_BUILTIN 13
+
+#define PIN_A0   (14)
+#define PIN_A1   (15)
+#define PIN_A2   (16)
+#define PIN_A3   (17)
+#define PIN_A4   (18)
+#define PIN_A5   (19)
+#define PIN_A6   (20)
+#define PIN_A7   (21)
+
+constexpr uint8_t A0 = PIN_A0;
+constexpr uint8_t A1 = PIN_A1;
+constexpr uint8_t A2 = PIN_A2;
+constexpr uint8_t A3 = PIN_A3;
+constexpr uint8_t A4 = PIN_A4;
+constexpr uint8_t A5 = PIN_A5;
+constexpr uint8_t A6 = PIN_A6;
+constexpr uint8_t A7 = PIN_A7;
+
 #endif