topic How to use big array in DSP? in CodeWarrior for StarCore

How to use big array in DSP?

JackyUM — Thu, 26 May 2011 02:13:53 GMT

Hi,

I am new to dsp. It seems

int array[10000]

can not work properly. Could you anyone tell me how to fix this?

Sorry for asking this simple question~

Re: How to use big array in DSP?

CrasyCat — Thu, 26 May 2011 15:10:00 GMT

Hello

Can you please be a bit more specific here/

Which processor are you using (MSC8156, MSC8144, ...)?

What is the problem you are seeing?

Are you getting an error message at link time? Which one?

Are you getting a problem at runtime? Which one?

CrasyCat

Re: How to use big array in DSP?

JackyUM — Thu, 26 May 2011 21:26:46 GMT

Sorry I did not make it clear.

I use MSC8156EVM board, which is a six-core SC3850 architecture. In my program, I have to use a lot of large arrays.

This, for instance, is what I did,

#define SIZE 20000

...

void main()

{

int din[SIZE];

...

CRC(din,g);

Seg(din,F);

}

I use codewarrior 10.1.5, it gives me this error:

Fatal: LCF configuration: no physical layout result;physical memory M3. Memory size is 0x001000000 and the requested size is 0x00112c00

Re: How to use big array in DSP?

CrasyCat — Fri, 27 May 2011 14:29:55 GMT

Hello

Any reason you are defining the big array as local variable?

If din needs to be local, you need to increase the stack size in the linker command file (_StackSize defined in common.l3k).

But I would rather recommend to define din as global variable.

Then using pragma data_seg you can place the variable in DDR where you have more room available.

CrasyCat

Re: How to use big array in DSP?

JackyUM — Fri, 27 May 2011 21:26:37 GMT

Hi,

As you suggested, I put it as the global variable. But can you show me how to use the #pragma to put this into DDR? An example would be great!

Thanks!

Re: How to use big array in DSP?

JackyUM — Fri, 27 May 2011 23:17:15 GMT

Hi,

This is what i tried,

#pragma data_seg_name "Mydata"

I do not know how "Mydata" is mapped to DDR. Can you please show me how to use this pragma as well as how to assign some specific section in DDR?

Re: How to use big array in DSP?

CrasyCat — Mon, 30 May 2011 13:19:16 GMT

Hello

Which version of CodeWarrior are you using?

V3.2?

V10.1.5?

CrasyCat