Quintin Beukes escreveu:
> Hey,
>
> I am using the HiTech compiler, since I know this might be compiler depen=
dent.
>
> I was hoping for some advice/corrections on dynamically allocating memory.
>
> My understanding is this:
> 1. The device has X bytes of memory.
> 2. I can assign the address of memory I wish to use to a pointer, and
> work from there.
> 3. I need to somehow make sure I don't use memory which is already
> assigned by the compiler.
> 4. I _assume_ the compiler will use the lower memory ranges, so if I
> know how much memory the compiler has assigned, I can use any other
> above that address? I can determine this from the following output:
> Memory Summary:
> Program space        used   8DEh (  2270) of  8000h bytes   (  6.9%)
> Data space           used    A9h (   169) of   600h bytes   ( 11.0%)
> EEPROM space         used     0h (     0) of   100h bytes   (  0.0%)
> External data memory None available
> ID Location space    used     0h (     0) of     8h nibbles (  0.0%)
> Configuration bits   used     7h (     7) of     7h words   (100.0%)
>
> >From here I figured, I can choose an address range based on the followin=
g data:
> 1. I have a PIC 18F2520.
> 2. It has 1536 bytes of SRAM (600h), as seen in row 2 of the summary abov=
e.
> 3. The compiler assigned 169 bytes (A9h) of memory.
>
> Then chosen as follows: Any addresses above A9, and to accommodate
> future changes, use any above 200, and carefully monitor my compiles?
>
> Alternatively. I had a quick glance over the compiler's manual, and
> noticed memory areas called "psects", which can be user defined with
> #pragma psect, but I don't see how I can use this for the described
> purpose.
>
> Any/all advice would be appreciated.
>
> Quintin Beukes
>   =


Greetings,

Take a look at my page:
<http://www.piclist.com/techref/member/IMB-yahoo-J86/heap-mgmt.htm>
Directly related to your needs, probably off-the-shelf.

See other PIC-related stuff also:
<http://www.piclist.com/techref/member/IMB-yahoo-J86/index.htm>

Best regards,

Isaac

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