Synth-DIY Yahoo! Groups Archives

Handlig of VICVectAddr in FIQ

2005-09-21 by Marko Panger

Hi all,

I have a doubt regarding the handling of the VICVectAddr register in a
FIQ rutine.

My VIC is setup in such a way that I have just one source selected as
FIQ, thus is not vectored as other IRQs are.

Do I still have to acknowledge and update priorities near the end of
the FIQ handler by writting the VICVectAddr = 0; ?

I dont get the users manual very well at this point as it says that
the VIC should be updated for vectred interrupts, but my FIQ is not
vectored.

Any advice ?

Regards,
marko

Re: [lpc2000] Handlig of VICVectAddr in FIQ

2005-09-21 by Richard Duits

De FIQ never uses the VICVectAddr register (FIQ routines cannot be 
vectored), so it is not needed
to clear the FIQ by writing to VICVectAddr.

Richard Duits


Marko Panger wrote:

Show quoted textHide quoted text

> Hi all,
>
> I have a doubt regarding the handling of the VICVectAddr register in a
> FIQ rutine.
>
> My VIC is setup in such a way that I have just one source selected as
> FIQ, thus is not vectored as other IRQs are.
>
> Do I still have to acknowledge and update priorities near the end of
> the FIQ handler by writting the VICVectAddr = 0; ?
>
> I dont get the users manual very well at this point as it says that
> the VIC should be updated for vectred interrupts, but my FIQ is not
> vectored.
>
> Any advice ?
>
> Regards,
> marko
>
>
>
>
>
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Lpc2000

Handlig of VICVectAddr in FIQ

Handlig of VICVectAddr in FIQ

Re: [lpc2000] Handlig of VICVectAddr in FIQ

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