Is there a place to store a pointer that I can pick up in an interrupt handler?

[Jim]

In my ADC interrupt service routine (ADC_IRQHandler), I'd like to have a pointer available that I could use to carry some state from the main app thread to the IRQ handler.

Yes, I could do this by declaring a global, but I go to great lengths to avoid using globals so if there's an existing place to stash a pointer I'd be much happier.

[John Kelley]

Globals are the only answer unless you want to write a function to return a pointer to a static member variable and call that from your interrupt routine. For example:

struct my_struct *get_my_struct_ptr() { static struct my_struct data; return &data; }

[Jim]

I think that's a little cleaner than a global as it limits the contract to the function call vs. leaving a variable out there that is hard to change down the road.

Thanks!