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will-hart
will-hart

Reputation: 3831

Arduino Due conditional compilation constant for custom library

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\tools\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?

Upvotes: 3

Views: 4048

Answers (2)

Adam F
Adam F

Reputation: 1151

The _SAM3XA_ will work, but includes a lot of other Atmel ARM chips (SAM3X8C, SAM3X8H, etc.).

Something more precise would be 

#if defined (__arm__) && defined (__SAM3X8E__) // Arduino Due compatible
// your Arduino Due compatible code here
#endif

(See the file sam3.h for more info.)

If you just want to target the Arduino Due (leaving out compatible boards), you can use

#if defined (_VARIANT_ARDUINO_DUE_X_)
// your Arduino Due code here
#endif

(This is defined in the Arduino Due's variant.h file.)

Upvotes: 5

mpflaga
mpflaga

Reputation: 2827

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

Upvotes: 3

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