michael_v_truong wrote:
- Right now I'm having trouble with global variables. I defined a
variable in one of my headerfiles. My main program can change and
manipulate that variable, but if I manipulate it in the interrupt, I
can confirm that change in the interrupt, but once I return to main,
the variable reverts back to its previous state (before the interrupt).
try: volatile int myglobalvar;
gcc optimizes variable usage and loads them into a register e.g. in a
loop. if the variable can change from the outside, while running a
function, you have to declare it as volatile.
chris
