I'm encountering a strange error with avr-gcc 4.6.3 and 4.7.2 using
the timer interrupt. The code I'm using is attached. As you can see,
I was trying to tie in to the Arduino environment (with Eclipse) so
that I could help my students wean off that set of functions to being
able to use the hardware directly.
When I set up the library, I encountered a strange error and was able
to trace it back to this simple program that sets up the timer with a
prescalar of 1024 and then increments an unsigned long counter when
that timer overflows. When the counter reaches a specific value, I
toggle the built-in LED on the Arduino board connected to PORTB.
The strange behavior is that if I initialize the counter to 0, the
code doesn't work--appearing to hang. If I initialize the counter to
1, everything works perfectly. I have verified that if I make a
similar change to the Arduino libraries that the original code begins
to work properly.
I'm not sure what the exact error is since I can use the Arduino
environment on my machine without a problem, but when I try to compile
it through Eclipse it gives me this error. I'll include the build log
as an attachment in case particular compiler/linker flags are triggering
the error.