topic Re: How to set a specific variable address in Classic/Legacy CodeWarrior

How to set a specific variable address

Olivier — Wed, 21 Jun 2006 21:21:41 GMT

Hi everybody,

Does anyone know how to set up a variable at a specific address in CodeWarrior?

I need this to share a variable between two independent softwares (a bootloader and an application) in the RAM of a coldfire.

Thx,

Olivier

CrasyCat — Thu, 22 Jun 2006 17:30:24 GMT

Hello

Which processor are you targeting (HC08, HC12, Coldfire, MPC82xx, ...)?

Which version of CodeWarrior are you using? To retrieve that info:

- Start IDE
- Select Help -> "About Freescale CodeWarrior"
- Click on "Installed products"

The version number I am interested in are displayed on the top of the dialog.

CrasyCat

Teckna — Thu, 17 May 2012 21:17:59 GMT

I have the same need as Olivier, I use a custom board with K60N512 processor, Codewarrior 10.2 and MQX 3.8.

Many thanks

Teckna

konrada — Fri, 18 May 2012 14:36:43 GMT

You can modify your linker script (.lcf file) and use __declspec in your code to place variables there.

The linker script language is also described in the CW build tools user guide, reachable from online help.

Teckna — Thu, 29 Oct 2020 08:41:07 GMT

I'd not want to create a section for every variable I want to place at specific address: I've read about the syntax:

int var @ 0x60000000 = 5;

(where 0x60000000 is the address where I want to place the var variable)

but it don't seem to be valid for the Kinetis architecture. Is there any similar syntax valid for the Kinetis architecture?

Many thanks

Teckna

Teckna — Mon, 28 May 2012 19:15:07 GMT

Is there any other suggestion?

Teckna

konrada — Wed, 30 May 2012 18:28:57 GMT

You could go the

#define bla (*((unsigned long volatile*)0x12345678))

way.