Lpc2000

>The only time you might realisticly want to support SWI is for semi-
>hosting mode support. I have also seen an RTOS done using SWI to make
>all OS calls atomic, but that was rather contrived and it would have
>been done better a duifferent way. Semi-hosting allows BIOS-like
>handlers (for you old x86/DOS rememberers like me) for printing etc to
>be handled by SWI handlers, but that can be typically ignored with no
>ill effects (other than not getting the functionality).

I use the SWI for tasks to force a context switch (Yield).  The context
switch occurs out of system mode so no problem with ldmfd's.  Seems the
simplest way to me but I would be interested in an expansion on your
comments above.

AFAIK provided ldmfd's are always followed by a NOP they are fine in
supervisor and IRQ modes.

Regards,
Richard.


http://www.FreeRTOS.org





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