How to check if nano board is in use?

Projects Programming
1

I'm trying to add a check in the code to make sure that the proper board has been selected.

This code work fine for Mega 2560:

#if !defined(__AVR_ATmega2560__)
#error Must use ATMEGA 2560
#endif

I tried this for the nano board:

#if !defined(__AVR_ATmega328P__) || !defined(__AVR_ATmega328__)
#error Must use a Nano
#endif

but when checking the code the error message "Must use a nano" is trigged even if the board "Arduino Nano" is selected.

Suggestions?

2

328P is an uno

Dont know the Definition of nano though. Try out without p since the CPU is only 328

3

Where did you find the board constant names AVR_ATmega328P and AVR_ATmega328 ?

1 Like
4

aarg:
Where did you find the board constant names AVR_ATmega328P and AVR_ATmega328 ?

By searching the .h files. But it does not seem to be the correct name.

5

ARDUINO_AVR_UNO works for uno. but i can't find a list of others

i see it used as a compiler -D option.

1 Like
6

thehardwareman:
By searching the .h files. But it does not seem to be the correct name.

...and which .h file is it in?

7

Arduino\hardware\tools\avr\avr\include\avr\io.h

8

Turn on verbose mode
Build ANY sketch targeted to NANO
Look at the options passed to the compiler, find the -D option containing "BOARD" and "NANO"

Many boards use 328P not only Nano. You need the BOARD define, NOT the CPU define.

Regards,
Ray L.

1 Like
9

RayLivingston:
Turn on verbose mode
Build ANY sketch targeted to NANO
Look at the options passed to the compiler, find the -D option containing "BOARD" and "NANO"

Many boards use 328P not only Nano. You need the BOARD define, NOT the CPU define.

Regards,
Ray L.

Did not thought about that - thanks.

Found

.... -DARDUINO=10812 -DARDUINO_AVR_NANO ...
10 
#if !defined(__AVR_ATmega328P__) || !defined(__AVR_ATmega328__)
#error Must use a Nano
#endif

The if statement would only be false when both AVR_ATmega328P and AVR_ATmega328 were defined.