To many variable? PIC18f452/458.

[Lehhu]

I've a problem with a big program, so a write small program for a test.
My program:

VOID main(){
WHILE ( 1 ) {
output_high ( pin_A0 );
delay_ms ( 1000 );
output_low ( pin_A0 );
delay_ms ( 1000 );
}
}

At the beginning of this program I’ve many variable. If variables takes less then 96 bytes it works ok, and part of .lst file looks like:
RAM used: 95 (6%) at main() level
96 (6%) worst case
.............................
00F8: CLRF 06
00FA: CLRF 08
00FC: CLRF 09
00FE: CLRF 0A
0100: CLRF 0B
0102: CLRF 0C

But if I add only one variable program don’t works correctly and part of .lst file looks like:
RAM used: 96 (6%) at main() level
97 (6%) worst case
......................................
0034: CLRF x60
0036: CLRF x61
0038: CLRF x62
003A: CLRF x63

No ERRORs and no wornings from compiler.

What does the ‘x’ means, and why the program don’t work correctly when I’ve more then 96 bytes takes for variables?

I’m using: PCH 3.242
PIC18f452/458

Any ideas?

P.S. Sorry for my english

[Ttelmah]

The 'x', means this is using bank addressing. There will be a line just in front of this block, setting the bank value to be used.
This is normal.
Below 96 bytes, everthing fits into the bottom bank, so this does not happen.
Your 'test'program should work right in either case, but you don't show enough to know for sure. What are the fuses set to?. Show the variable declarations.
There are some memory allocation oddities that have appeared with the latest compilers. These are tied up with these really being in part 'betas' for the forthcoming linker. What happens with 3.229?. 3.243, fixes some of these problems. Generally, the problems don't seem to appear if you stick to simple variable declarations. Unless you need the new features offered by the 'latest' compiler, you will be safer using the earlier posted version(s), especially when there are major changes happening.

Best Wishes

[Guest]

After Your answer Ttelmah I've start searching something about bank adressing,and I found:
A new #TYPE option has been added to allow the default address space for
a block of code to be specified. For example to allocate a block of variables
to the memory area 0x100 to 0x1FF do this:

typemod <,,,0x100,0x1ff> user_ram_block;

#type default=user_ram_block

... all variable declarations in this area
... will be in 0x100-0x1FF

#type default=

... memory allocation back to normal

When I apply this the program start works correctly.

THX

[ckielstra]