Arduino Due conditional compilation constant for custom library

Question

I'm writing a custom library and it is working correctly on an Arduino Uno. However I've now got my hands on an Arduino Due and I need to define some board specific pin constants. I know for most boards you can do this through an `#ifdef` directive using the IO constants defined in `\arduino-1.5.2\hardware	ools\avr\avr\include\avr\io.h`. For instance: ``` #if defined (__AVR_ATmega128__) //do something specific #endif ``` Does anybody know which is the correct constant to use for the Due?

Accepted Answer

I typically use ...

```
#ifndef __AVR__
// something special just for non AVR8's
// ...
#endif
```

Where as I believe you could also use...

```
#ifdef _SAM3XA_
// something special just for Due's SAM3XA
// ...
#endif
```

Arduino Due conditional compilation constant for custom library

Solution

Problem