topic Re: declaring large data arrays in external memory in CodeWarrior for MCU

HC12: declaring large data arrays in external memory

NZ_Design — Fri, 13 Oct 2006 06:29:19 GMT

BatteryRAM = NO_INIT 0x200000'G TO 0x3FFFFF'G; // CS1

Bat_RAM INTO BatteryRAM;

typedef struct
{
unsigned char cOutExit;
unsigned bOutFired:1;
unsigned char cBatchExit;
unsigned char cLabelPoint;
unsigned char cFruitSize;
unsigned int iFruitWeight;
}BED;

#define MAX_BED 0x03FF

#define MAX_LANES 16

#pragma DATA_SEG __GPAGE_SEG Bat_RAM
char cExt_RAM[56];
Prog_Layout Program[9];
BED FruitBed[MAX_LANES][MAX_BED];
#pragma DATA_SEG DEFAULT

L4100: Failed to convert address 0x200000'G of FruitBed because of 'External space area (140000..3FFFFF) has no logical address'

L4100: Failed to convert address 0x200000'G of In debug info because of 'External space area (140000..3FFFFF) has no logical
address'

That is understandable but how do I declair my arrays so as the complier recognises them.

My old compiler wasn't able to cope with paging so I did it manuallly in my code. Putting each lane on a seperate page at the same address. I are trying to get away from this.

Does anybody have a good surgestion.

Daniel

Message Edited by CrasyCat on 2007-04-13 01:24 PM

Re: declaring large data arrays in external memory

CrasyCat — Fri, 13 Oct 2006 18:34:44 GMT

Hello

Which CPU are you targeting?

Which version of CodeWarrior are you using?

To retrieve that information:

- Start IDE

- Select Help -> "About Freescale CodeWarrior"

- Click on "Installed Products"

- Click on "Save As", save the result in a file and attach it to that post.

CrasyCat

Re: declaring large data arrays in external memory

CompilerGuru — Tue, 17 Oct 2006 04:44:16 GMT

One reason for this warning is if you do only surround the definition of the variables with a
#pragma DATA_SEG __GPAGE_SEG Bat_RAM
but not the declarations of the variables.
I recommend to always use the same #pragmas before/after both, and to include the header file declaring the variable also in the C file defining the variable so the compiler can issue a warning:
>Warning : C4200: Other segment than
>in previous declaration

in case of a inconsistency.

If the compiler does not know that an external variable should be accessed with __GPAGE_SEG,
and the debug information will refer with logical addresses to it and this does cause this message.

Note also that this is just a warning about the debug information (and not about code).

Daniel

Re: declaring large data arrays in external memory

NZ_Design — Tue, 31 Oct 2006 08:05:58 GMT

The processsor I are using is MCS12XDP512 and code worrier version is 5.7.0

I re wondering if I should be setting up indervidual pages and assigning the pages to Bat_RAM.

Daniel

Re: declaring large data arrays in external memory

CrasyCat — Tue, 31 Oct 2006 19:10:00 GMT

Hello

There seems to be something wrong in the application.

Please submit a SR for that through our on-line support web page and attach the whole project reproducing the trouble.

Our support people will be able to look into that and identify the problem.

CrasyCat