On 2006-03-20, Roberto Padovani <[email protected]> wrote:
> Has anyone ever changed an interrupt handler during runtime?
I've done it on other processors, but I've never done it by
changing a value in flash. I've done it by changing the value
of a vector that's in RAM, and also by putting the address of a
RAM-resident jump instruction in flash, and then changing the
destination of that jump instruction at run-time.
> 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.
Is this something you're going to do often? It takes a lot of
time and power to write to flash. And you don't get an
infinite number of write cycles either.
> 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.
It depends on when and how often you need to change ISRs.
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