Got the "Out of ROM.." while writing interrupt

[Predator_MF]

Hi.
My problem is when I write smt into INT_RB interrupt, I get "Out of ROM" message. When I try to write Scan_Keys() function, I get the error, when I try to write anything else (like printf("bla bla") for example) everything works fine. I defined Scan_Keys() with a #separate, but no results? Any ideas?

[Ttelmah]

Without knowing what is 'in' the Scan_Keys function, it is not possible to answer.
The normal reason is that the function is too large to fit in a page bank, and needs to be split up. If this is the case, you need to seriously be considering doing the solution a different way, since a function this large, implies a significant time involved, and as such the code should not be in an interrupt. Normally a simple matrix keyscanner, should only be a few lines of code, so post it, and somebody may be able to see what is making it so large.

Best Wishes

[valemike]

i don't have this problem while working with 18Fs, but encountered this a lot with 16F devices. Like Ttelmah said, you have to break up your functions into smaller functions.

And when doing so, i'd then have to use the #separate directive a lot, as well as declare 16-bit pointers.

e.g.

//prototype
#separate
void my_fxn(void);

...
#separate
void my_fxn(void)
{
...
}

Doing so will help alleviate your out-of-rom errors. It becomes a pain after a while.

[Guest]

I've never had this problem with 18Fs too... My KeyScan() code is extremely small...

[Predator_MF]

I forgot to login, this post above is mine

[Darren Rook]