Re: [avr-gcc-list] Strange problem - Pointer not null when declared

[Russell Shaw]

Gerard Marull Paretas wrote:
> Hello.
>
> I've been trying to find the reason of a curious bug, but I can't. It's 
> so strange: I create a new structure that inside contains two pointers 
> to other structures and one uint8_t. However, pointers are not NULL when 
> created, so that makes my code to not work as it should. I've seen that 
> when declaring that structure with static attribute all works fine (or 
> making it global), pointers value is null when function starts. Creating 
> the structure in other code part creates the same problem...
>
> I really don't know what it can be... I attached the disassembly of the 
> two code versions generated while debugging (with C source lines), one 
> with static attribute and the other without.

Creating any non-global data will have random values. Only if declared
outside a function will they be initialized to zeros.