No.  The maximum context you can push into the stack per function call is
somewhere near 128 (a bit smaller than that I believe, I forget the 'magic'
number here).  This is due to C18 uses frame pointer (FSR2) and offset from
WREG (PLUSW2) to access the local variables.  The offset is a signed value
and that means you can access from offset -128 until 127 to the location
pointed by FSR.  However the local is allocated at higher address side of
location pointed by frame pointer and hence you can only push 127 maximum.
The actual might be a bit less than that since C18 might reserve some for
'housekeeping' use... As I said I forgot the magic number.

The solution if you really need that large data:  use static or overlay
variable.


Best regards,

WH Tan

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
> Of Mario Mendes Jr.
> Sent: 30 November 2005 10:17
> To: 'Microcontroller discussion list - Public.'
> Subject: [PIC] C18 stack too large error
>
>
> Hi guys,
>
> Once again I come to you for help.
>
> The following code does not compile and rewards me with the message that
> follows it:
>
> void fnWhatever (void)
> {
> 	int i[256];
> }
>
> Error [1300] stack frame too large
>
> And this is my modified version of the supplied 18f452.lkr.
>
> LIBPATH .
>
> FILES c018i.o
> FILES clib.lib
> FILES p18f452.lib
>
> CODEPAGE   NAME=vectors    START=0x0            END=0x29
> PROTECTED
> CODEPAGE   NAME=page       START=0x2A           END=0x7FFF
> CODEPAGE   NAME=idlocs     START=0x200000       END=0x200007
> PROTECTED
> CODEPAGE   NAME=config     START=0x300000       END=0x30000D
> PROTECTED
> CODEPAGE   NAME=devid      START=0x3FFFFE       END=0x3FFFFF
> PROTECTED
> CODEPAGE   NAME=eedata     START=0xF00000       END=0xF000FF
> PROTECTED
>
> ACCESSBANK NAME=accessram  START=0x0            END=0x7F
> DATABANK   NAME=gpr0       START=0x80           END=0xFF
> DATABANK   NAME=gpr1       START=0x100          END=0x1FF
> DATABANK   NAME=gpr2       START=0x200          END=0x2FF
> DATABANK   NAME=gpr3       START=0x300          END=0x3FF
> //DATABANK   NAME=gpr4       START=0x400          END=0x4FF
> //DATABANK   NAME=gpr5       START=0x500          END=0x5FF
> DATABANK   NAME=grp4       START=0x400          END=0x5FF
> ACCESSBANK NAME=accesssfr  START=0xF80          END=0xFFF
> PROTECTED
>
> SECTION    NAME=CONFIG     ROM=config
>
> //STACK SIZE=0x100 RAM=gpr5
> STACK SIZE=0x200 RAM=grp4
>
> What exactly am I missing here?
>
> Thanks in advance.
>
>
> -Mario

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