The hardware priority shoul have little effect on timing. Rtlinux ignores priority of
interrupts and
essentially acts as if all interrupts are at the same level. The hardware will
prioritize irqs,
but this prioritization will only make a difference if the higher priority irq is
flooding.
But I strongly recomment going with a PCI rather than a ISA bus servo interface board.
ISA is
bad, slow, morally incorrect, and etc.
On Wed, Oct 20, 1999 at 11:41:18AM -0700, Garth Gaddy wrote:
>
> I am doing 4 axis servo control w/ an ISA servo interface board and RTLinux. This
>will eventually find it way into a machine that needs maximum uptime possible.
>Therefore I would like to use a SCSI Raid controller with Hot-swap drives.
> I have been warned that the Raid controller, a pci bus master card, will take
>priority over any ISA device and therefore I might not be able to maintain
>determinism of 1khz ISR on the interface card.
> Does anyone know if this is true?
>
> Secondly I have looked into a similar card in PCI form from Acromag. I can
>configure what interrupt I want it to generate, typically IRQ 5.
> Does anyone know how the interrupt controller resolves the SCSI Raid card and the
>PCI Servo card's respective interrupts?
> Is there a way to set up interrupt prioritization so that the Servo card has
>preemptive priority?
>
> Thanks in advance,
>
> Garth Gaddy
>
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