Quoting Scott <goldscott@gmail.com>:
>
> In general, variables used both in and out of ISRs should be =20
> declared volatile. Take a look at what that keyword means. The =20
> compiler doesn't use optimizations for those variables that it might =20
> otherwise use for non-volatile variables.
>
> -Scott


I remember volatile from my PC C-programming days, but didn't realize =20
now that I'd need it for variables not used in the main code, but used =20
in the ISR.  From what I remember back then, in PC C compilers (MS C6, =20
gcc, etc) volatile was not required when all optimizations were turned =20
off.  Been too long since I did any real C/C++ programming, so don't =20
hold me to this.

Cheers,
-Neil.


--=20
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