Add PIN_* defines to AVR variants

Author: sandeepmistry

hardware/arduino/avr/variants/mega/pins_arduino.h

@@ -30,31 +30,57 @@
 #define analogInputToDigitalPin(p)  ((p < 16) ? (p) + 54 : -1)
 #define digitalPinHasPWM(p)         (((p) >= 2 && (p) <= 13) || ((p) >= 44 && (p)<= 46))
 
-static const uint8_t SS   = 53;
-static const uint8_t MOSI = 51;
-static const uint8_t MISO = 50;
-static const uint8_t SCK  = 52;
+#define PIN_SPI_SS    (53)
+#define PIN_SPI_MOSI  (51)
+#define PIN_SPI_MISO  (50)
+#define PIN_SPI_SCK   (52)
+
+static const uint8_t SS   = PIN_SPI_SS;
+static const uint8_t MOSI = PIN_SPI_MOSI;
+static const uint8_t MISO = PIN_SPI_MISO;
+static const uint8_t SCK  = PIN_SPI_SCK;
+
+#define PIN_WIRE_SDA        (20)
+#define PIN_WIRE_SCL        (21)
+
+static const uint8_t SDA = PIN_WIRE_SDA;
+static const uint8_t SCL = PIN_WIRE_SCL;
 
-static const uint8_t SDA = 20;
-static const uint8_t SCL = 21;
 #define LED_BUILTIN 13
 
-static const uint8_t A0 = 54;
-static const uint8_t A1 = 55;
-static const uint8_t A2 = 56;
-static const uint8_t A3 = 57;
-static const uint8_t A4 = 58;
-static const uint8_t A5 = 59;
-static const uint8_t A6 = 60;
-static const uint8_t A7 = 61;
-static const uint8_t A8 = 62;
-static const uint8_t A9 = 63;
-static const uint8_t A10 = 64;
-static const uint8_t A11 = 65;
-static const uint8_t A12 = 66;
-static const uint8_t A13 = 67;
-static const uint8_t A14 = 68;
-static const uint8_t A15 = 69;
+#define PIN_A0   (54)
+#define PIN_A1   (55)
+#define PIN_A2   (56)
+#define PIN_A3   (57)
+#define PIN_A4   (58)
+#define PIN_A5   (59)
+#define PIN_A6   (60)
+#define PIN_A7   (61)
+#define PIN_A8   (62)
+#define PIN_A9   (63)
+#define PIN_A10  (64)
+#define PIN_A11  (65)
+#define PIN_A12  (66)
+#define PIN_A13  (67)
+#define PIN_A14  (68)
+#define PIN_A15  (69)
+
+static const uint8_t A0 = PIN_A0;
+static const uint8_t A1 = PIN_A1;
+static const uint8_t A2 = PIN_A2;
+static const uint8_t A3 = PIN_A3;
+static const uint8_t A4 = PIN_A4;
+static const uint8_t A5 = PIN_A5;
+static const uint8_t A6 = PIN_A6;
+static const uint8_t A7 = PIN_A7;
+static const uint8_t A8 = PIN_A8;
+static const uint8_t A9 = PIN_A9;
+static const uint8_t A10 = PIN_A10;
+static const uint8_t A11 = PIN_A11;
+static const uint8_t A12 = PIN_A12;
+static const uint8_t A13 = PIN_A13;
+static const uint8_t A14 = PIN_A14;
+static const uint8_t A15 = PIN_A15;
 
 // A majority of the pins are NOT PCINTs, SO BE WARNED (i.e. you cannot use them as receive pins)
 // Only pins available for RECEIVE (TRANSMIT can be on any pin):