Allocating big buffer

Forum 2005-2010 (read only) Software Syntax & Programs
1

Hello,

For my program, I need to allocate a big (as big as possible, at least 1KB) read-write buffer.

What's the best way to do it? From heap? Stack?

How do I know if I have overflowed the stack?

I have a Duemilanove with 328P.

Thanks!

2

You can use malloc(1000) and it will fail gracefully if the storage isn't available.

If it were me i'd just define a global char(or whatever) array and use that. I'd also carefully add up all my ram use and make sure i was well under 2k.

Other than probing with malloc i don't think there's any way to know if your out of memory other than your program behaving oddly.

3

Thanks for the suggestion!

Turned out I can allocate 1823 bytes with nothing else.

But I guess that would be bad, since stack will eat into the heap, so I think I will still only allocate 1024.

Thanks again!