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I use my Arduino IDE to either upload my sketch to a Arduino or ATTiny or ATmega328. As you know each device can have a different pinout. Does the Arduino compiler support ifdef, depending on the board I am connected to?

For example

#ifdef Attiny85
       a=0; b=1; c=2;
#else
       // arduino
       a=9; b=10; c=11
#endif
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1 Answer 1

up vote 3 down vote accepted

Yes. Here is the syntax:

#if defined(__AVR_ATmega328P__) || defined(__AVR_ATmega168__)
    //Code here
#endif

You can also do something like this for the Mega:

#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
    //Code here
#endif

Assuming the implementation for the ATtiny is correct, your code should be like this:

#if defined (__AVR_ATtiny85__)
       a=0; b=1; c=2;
#else
       //Arduino
       a=9; b=10; c=11
#endif
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In Arduino.h, __AVR_ATtiny85__ is used (capital T). Not sure if it makes any difference though. –  geometrikal 9 hours ago
    
@geometrikal Nice catch (typo)... edited. Thanks! –  Annonomus Penguin♦ 8 hours ago

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