Lpc2000

Thanks a lot Karl. Much valuable info!

/Ake

Karl Olsen wrote:

> --- In lpc2000@yahoogroups.com, "Ake Hedman, eurosource" <akhe@b...>
> wrote:
> >
> >> Sometimes you want some functions in RAM.  Those functions count
> >> as initialized global/static variables.
> >
> > How do one make a function go into ram?
>
> With gcc, the easiest way is like this:
>
> static void ramfunc (int i) __attribute__ ((section(".data")));
> static void ramfunc (int i)
> {
>   /* ... */
> }
>
> This means that the compiler puts the function in section .data
> instead of .text, and the linker and startup code then locates and
> processes it like initialized data, i.e. stores an initial copy in
> flash, and lets the startup code copy it to RAM.  The final RAM
> address is then used when you reference the function.
>
> Note that flash and RAM functions cannot call each other directly
> since flash and RAM are more than 32 MB apart in the memory map, out
> of reach by the BL instruction.  You then have to use indirect calls
> through function pointers.
>
> Karl Olsen
>
>
>
>
>
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-- 
 ---
Ake Hedman (YAP - Yet Another Programmer)
eurosource, Brattbergavägen 17, 820 50 LOS, Sweden
Phone: (46) 657 413430 Cellular: (46) 73 84 84 102
Company home: http://www.eurosource.se      
Kryddor/Te/Kaffe: http://www.brattberg.com
Personal homepage: http://www.eurosource.se/akhe
Automated home: http://www.vscp.org



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