How to use big array in DSP?

[JackyUM]

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~ 

[CrasyCat]

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

[JackyUM]

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

[CrasyCat]

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

[JackyUM]

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!

[JackyUM]

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?

[CrasyCat]

Hello

Which version of CodeWarrior are you using?

V3.2?

V10.1.5?

CrasyCat