S12 / MagniV MicrocontrollersのトピックRe: MC9S12XDT512: Large array in the flash.

MC9S12XDT512: Large array in the flash.

IgorN — Mon, 17 Mar 2008 15:15:17 GMT

Hi,

I'm working on the project created in CodeWarrior IDE v5.7.0 using the Project Wizard.

Now I need to define a array greated than 1 flash page size. Wich way I can to do it?

Re: MC9S12XDT512: Large array in the flash.

CrasyCat — Mon, 17 Mar 2008 22:37:10 GMT

Hello

When you say your array is bigger than 1 flash page do you mean it is bigger than 16K or bigger than 64K?

What is your array size actually?

CrasyCat

Up to 400K.

IgorN — Mon, 17 Mar 2008 23:17:52 GMT

and may be 450K.

Re: Up to 400K.

CrasyCat — Tue, 18 Mar 2008 17:26:54 GMT

Hello

CodeWarrior for HC12 does not allow to allocate an object across a page boundary.

If you are using global addresses in the .prm file you can have object up to 64K.

But you cannot have object with size bigger than this.

You will have to split your big data structure in portion which are not bigger than 64K.

If you decide to allocate an object across page boundary you will have to manage the page switch yourself.

The compiler will not do it for you.

CrasyCat

Where can I to read about it?

IgorN — Tue, 18 Mar 2008 18:33:41 GMT

Did you can to take me any link or any document name(*.pdf etc) there it is wroten?

And where I can to read about global addresses definition in a *.prm file? I'm seeking for it but not found yet.

Just lot of thanks for your previos responce.

Re: Where can I to read about it?

CrasyCat — Tue, 18 Mar 2008 22:42:15 GMT

Hello

You can define a global address in the .prm file using the suffix 'G.

For example

RAM_BANKED = NO_INIT 0xF9000'G TO 0xF9FFF'G;

I would look in the Linker section of the Build_Tools_Utilities.pdf for more information.

CrasyCat

Build_Tools_Utilities.pdf

IgorN — Tue, 18 Mar 2008 22:54:13 GMT

Where can I to found this document. Google brings nothing by this name.

Is this suffix correct for EEPROM and flesh too? Wich kind of addresses must be there - phisical or logical?

Re: Build_Tools_Utilities.pdf

allawtterb — Tue, 18 Mar 2008 23:10:39 GMT

The pdf CrasyCat is referring to should already be on your computer. Go to the folder where CodeWarrior was installed and it is under \Help\PDF. Hope this helps.

Re: Build_Tools_Utilities.pdf

CrasyCat — Wed, 19 Mar 2008 16:28:58 GMT

Hello

In the example I provided, the addresses are global addresses (address in global address space).

CrasyCat