problem with CCS out of memory

global · Joined: 01 Feb 2005 Posts: 21 Location: Paris

Hello,

i'am using CCS compiler 3.28, to program a PIC 16LF877A, in my software, i have 3 subroutines, and i want to add a calculation section.
Without this section, my program use 83% of the ROM memory.

If i add this section in the Main, the compiler says "out of ROM memory".
If i try to add this section in a subroutine, with two of them, the compiler compile the HEX file, but the program doesn't work.
It only works when i put the section in the last subroutine, but the program seems to run slowly.

So, i want to know, if there is something to configurate to use all the memory of the PIC.

Thanks for your help.
Bruno

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

Break the larger functions into smaller ones. This allows the compiler to better fit the code in the memory pages. You can also add the #separate to functions that are only called once to force the compiler to make these actual functions, otherwise, the compiler might optimize them and put them inline.

Humberto · Posted: Wed Mar 30, 2005 7:42 am

dyeatman · Joined: 06 Sep 2003 Posts: 1923 Location: Norman, OK

I wonder if he has device *=16 in his header?

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

He is out of ROM.

global · Joined: 01 Feb 2005 Posts: 21 Location: Paris

Hello,
Sorry my version of CCS is 3.150, i use device *=16 in my header, the Main of my program is only composed of call function, the 83% is all the program.
I forgot to mention that i also use 2 interruptions.
Thanks for your help
Bruno

dyeatman · Joined: 06 Sep 2003 Posts: 1923 Location: Norman, OK