topic Re: declaring array of constants in ROM in CodeWarrior for MCU

declaring array of constants in ROM

stevec — Thu, 02 May 2013 16:00:57 GMT

Hi,

I'm using a 9S08QE8 and wish to declare an array of constant ints into ROM and be able to reference them from another module.

I have used :

const static unsigned int page_table[] = {.........};

in the .h files with

extern unsigned int page_table[31];

to declare it to other modules.

I get linker error L1823 as well as an out of RAM error (because it has put it in RAM).

Can someone point me in the right direction. I have spent all afternnon trying to get this right. It sounds simple enough.

Thanks

Steve

BlackNight — Thu, 02 May 2013 16:14:05 GMT

I would make the declaration const too:

extern const unsigned int page_table[31];

Additionally, if you have it extern, then do *not* use static for the implementation:

const unsigned int page_table[] = {.........};

I hope this helps.

stevec — Fri, 03 May 2013 06:55:49 GMT

Hi Erich,

That seems to have sorted it. Many thanks. I will need to understand what I did wrong so I don't make the same mistake again. Back to the books!