15

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
asked Sep 13, 2014 at 12:38
0

1 Answer 1

15

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
answered Sep 13, 2014 at 12:50
2
  • In Arduino.h, __AVR_ATtiny85__ is used (capital T). Not sure if it makes any difference though. Commented Sep 13, 2014 at 12:52
  • 2
    alternatively using 1.5.+ IDE you can test against the board type you are building. See Arduino-IDE-1.5---3rd-party-Hardware-specification. Example "#if defined(ARDUINO_AVR_UNO)" or ARDUINO_AVR_MEGA2560 or ARDUINO_AVR_LEONARDO, etc... Commented Sep 14, 2014 at 3:55

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