> Hi!
>
> Has anyone ever changed an interrupt handler during runtime?
> I need to do that and any idea is welcome.
>
> I suppose I should declare two ISR like:
>
> interrupt (NOVECTOR) ISR1 {....}
> interrupt (NOVECTOR) ISR2 {....}
>
> and then write the address of the routine I want in the flash in the
> vector table.
>
> Or maybe is it better something like:
>
> interrupt (TIMERA0) ISR {
> if (flag)
> func1();
> else
> func2();
> }
>
> I would prefer the first solution because I have some performance
> issues with the second one.
>
> Any comment ?
> thanks,
>
> R#
>
There shouldn't be any real problem with re-writing the flash page, but
there are a number of things you have to be careful of - make sure all
interrupts are turned off before re-writing the page, including any possible
NMI sources. There is also the question of reliability - what happens if
there is a power failure during the update? As long as you are careful,
however, it should work - though it is not a good solution if you are
swapping vectors often.
If you have performance issues with the more standard flag-based solution,
try using inlining for the two functions. That should avoid any unnecessary
register save/restores, which might improve matters.
