MPLAB C18 Problem

[micr0man]

hello everyone,

I am having a unique problem with my C18 compiler. For unexplained reasons compiling a really simple program over half my data memory is used. Below is a snapshot of the problem:

as you can see the very simple program is using 268 bytes of data ram without even any bytes defined.

I am using a PIC18F4220 with MPLAB v8.66. The C18 compiler is the most recent free version of the microchip. I can zip the whole project if you wish or submit individual files.

I hope you can help me with this problem and any help is appreciated,

Dave

Edit: Sorry about the size problem. is there any way to reduce the picture size?

 

[blueroomelectronics]

You'll need to post your code.

Ahh never mind.

 

[hexreader]

Check out the linker file ....MCC18\lkr\18f4220.lkr

You will see that 0x0100 bytes (256 decimal) is reserved for the C18 stack.

Your program only "uses" 12 bytes.

Hope this helps

 

[micr0man]

thank you very much. your help is greatly appreciated.

Is there a way to lower this or is it set permanently?

 

[hexreader]

Is there a way to lower this or is it set permanently?

To change stack size you can-

1 edit ....MCC18\lkr\18f4220.lkr

or

2 copy the .lkr file to your project directory, add it to your project, then edit it.

or

3 leave everything as it is. When your program gets bigger, C18 might need the stack space

 

[micr0man]

Again thank you very much. Your help is greatly appreciated