SV: [Icc-avr] Using to much RAM for local variables

[Bengt Ragnemalm]

OK, so it is normal. Just needed to know.

Johannes, what do you mean with "always global"?  I have need for a
temporary 512 bytes, what good is it to make this into something permanent?
But if it is so tricky to track problems with to large temporary RAM
variables (I do use Stack Check) maybe it is better to define one global
array and switch the usage of it.

/Bengt

> -----Ursprungligt meddelande-----
> Från: icc-avr-bounces at imagecraft.com [mailto:icc-avr-
> bounces at imagecraft.com] För Richard Man
> Skickat: den 15 augusti 2008 10:45
> Till: benra at imt.liu.se; icc-avr at imagecraft.com
> Ämne: Re: [Icc-avr] Using to much RAM for local variables
> 
> There are billions problems to solve to write a compiler product.
> Most are easy, some are very difficult. Solving a SPECIFIC instance
> of a problem is easy, but solving a generic problem is never. To
> answer your questions directly, yes, it can be solved, especially by
> linker who does full call tree analysis and then layout all the SRAM
> requirements, and that'd be the right way to solve it. Unfortunately,
> that is not easy.
> 
> It is the same as requesting Atmel to add a "stack check"
> hardware.  All they need is a data break register. How hard can *that* be?
> 
> At 12:25 AM 8/15/2008, Bengt Ragnemalm wrote:
> >Hi.
> >
> >I felled in a new pit and have just found the ladder.
> >
> >I use an Mega88, it has 1 k RAM. I have declared two local arrays,
> >both with 512 bytes. Obviously this will not work if they are used
> >simultaneously. Unfortunately they are, something I totally missed.
> >But the code compiles fine and I have been a little upset struggling
> >with the problem that my hardware just turned off after 90 seconds
> >by it self without ever entering the POWER OFF state. The problem
> >was that as soon as one of the arrays was starting to write data to
> >the later sections, it instead was writing in my registers. Among
> >others, the register that was controlling the power.
> >
> >QUESTION: Is it natural that the compiler does not generate any
> >error in this situation?
> >
> >The actual problem should not be to difficult to solve.
> >
> 
> // richard (This email is for mailing lists. To reach me directly,
> please use richard at imagecraft.com)
> 
> _______________________________________________
> Icc-avr mailing list
> Icc-avr at imagecraft.com
> http://dragonsgate.net/mailman/listinfo/icc-avr