Re: [avr-gcc-list] Global variables and ISRs ???

[Christopher X. Candreva]

On Tue, 6 Sep 2005, Vincent Trouilliez wrote:

> Problem : on my ATmega32, after several experiments (only just started
> using it, learning...), I am suffering a big problem. It seems that when
> I declare a variable as global, then modify it within an interrupt
> routine, the 'main' function can't see that the variable has been
> modified, as if it weren't a global variable... hmmm.

You need to declare it as volatile

Search the mailing list archives, this has come up many times.

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