AW: [En-Nut-Discussion] NutRegisterIrqHandler() twice?

[Oliver Schulz]

Hi Przemek,

why to have more than one interrupt handler for one interrupt? Keep in mind, that you are working with microcontrollers (-> small code size), most times you need low latency to execute the handler, so chaining the handler isn't very smart.

In Nut/OS for each device you have one device driver with its interrupt handler. The device drivers are used to separate the hardware dependent code for a device from the "normal" user program.

So I cannot see why to have interrupt chaining...

Regards,
Oliver.

-----Ursprüngliche Nachricht-----
Von: en-nut-discussion-bounces at egnite.de [mailto:en-nut-discussion-bounces at egnite.de] Im Auftrag von Przemyslaw Rudy
Gesendet: Sonntag, 23. Oktober 2005 17:27
An: Ethernut User Chat (English)
Betreff: Re: [En-Nut-Discussion] NutRegisterIrqHandler() twice?

Well, I have just looked into the sources, no questions then and sorry
for my ignorance.

But for the future, would not be nice to have something like
NutAttachIrqHandler(), to have a queue of handlers?


Użytkownik Przemyslaw Rudy napisał:
> Hi
>
> Can I do this?:
>
> NutRegisterIrqHandler(&SIG_INTERRUPT6, handler1, NULL)
> NutRegisterIrqHandler(&SIG_INTERRUPT6, handler2, NULL)
>
> So registering two different interrupt handlers to the same irq
> expecting they are called one by one by the event?
>
> Or handlers are "the handlers" thus only one can be assigned?
>
> Regards
> Przemek
>
> _______________________________________________
> En-Nut-Discussion mailing list
> En-Nut-Discussion at egnite.de
> http://www.egnite.de/mailman/listinfo.cgi/en-nut-discussion
>
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