[Diy_efi] PC ECU?

[MWP]

> Hi MWP,
>
> Well one thing to consider is the X86 interrupt latencies, they are terrible
> compared to an embedded controller!  There is tons of stuff for software
> development :-)

>From the rt-linux web page:
"RTLinux's worst case interrupt latency on a modest, reasonably configured
x86 P is less than 15 microseconds from the moment the hardware interrupt
is asserted."

Surely thats fast enough for an ECU.

> Also stay away from the X86 I/O structure as it is very slow.  Memory mapped
> components are much more efficient.

Which means going PCI, which means lots of $$s and time for board design
and PCI logic.

Doing a 50/50 PC-uC split is sounding like a good idea.

>
> ----- Original Message -----
> From: "MWP" <mwp at overclockers.com.au>
> To: <Diy_efi at diy-efi.org>
> Sent: Monday, May 06, 2002 2:53 AM
> Subject: [Diy_efi] PC ECU?
>
>
> > Hi all...
> >
> > Well im kinda new to this scene, although i have made my own ign computer
> > beofre using a Atmel AVR.
> >
> > Anyway,
> > Has anyone tried using a x86 based PC as the ign/efi computer?
> > I have started thinking about it, and can build the hardware needed to do
> > it, but im wondering if theres anything ive forgotten about that would
> > make the project impossible. As in some quirks of the x86 system that
> > would make timing hard, etc.
> >
> > If i do it, itll be running under a stripped down linux install using the
> > RT-LINUX kernel which allows for good embedded software support.
> > Apparently it has interrupt latencies better than 15uS on an old pentium
> > system.
> >
> > So what do you guys think?
> > Is it worth looking further into?
> >
> > MWP
> >
> >
> > _______________________________________________
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> >
>
>
>
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