On Sun, 2008-11-23 at 16:35 +1100, Erik Christiansen wrote:
> On Sat, Nov 22, 2008 at 07:15:04PM -0800, Kirk Wallace wrote:
> > My two cents. I'd like to see what could be done with just a CPU, RAM,
> > Ethernet and GPIO, doing just the real time stuff. Maybe with four
> > channels of signals for BLDC motors. One problem though is that for a
> > board like this, you can get a whole PC for less money. Too bad cheap
> > wifi routers don't have lots of GPIO. Making 200,000 EMC2 motion boards
> > _would_ bring the unit cost down.
>
> +1
>
> For some time now, I've been checking each LinuxDevices newsletter for
> potentially suitable new mini-ITX cards. I've been looking for RS485
> too, because that'd be great for intra-machine communication, if
> satellite microcontollers are ever added, e.g. for a tool changer. (The
> noise immunity of balanced line, and immunity to significant DC offset,
> are both invaluable in the machine environment. It's also more real-time
> than the buffered USB appears to be.)
>
> Fanless would be best, perhaps, so the enclosure could be sealed.
>
> Even if "just the real time stuff" is sufficiently modular to be run on
> an SBC, it would be a lot of work to port e.g. eCos as underlying RTOS.
> (I've only ever done that once, and am glad I was paid for it. ;-)
>
> Still, having a reference "EMC2 RT Platform" would eliminate parport
> and other hardware compatibility worries. In time. But planning is the
> first step.
>
> Erik
>
How about something like this:
http://www.linuxdevices.com/news/NS8140322559.html?kc=rss
Still not perfect, but close.
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