On Mon, Feb 28, 2011 at 09:12:50AM +0100, Joachim Franek wrote:
> Have also a look to the bottom of the
> http://wiki.linuxcnc.org/emcinfo.pl?AVR
> page: it is about AVR32 for motor control
> (with eclipse based ide for linux).
Seeing that they are also supported by the gnu toolchain, and the UC3
devices have useful on-chip peripherals, I'd consider these 32 bit chips
a viable alternative to ARM, for our uses.
> I also prefer udp packets. Maybe we are
> able to concentrate our forced and avoid
> 12 or more variants of udp packets. Is there
> some code available on the emc side?
That would be inbuilt in the kernel, I'd expect. And in
/boot/config-2.6.24-16-rtai, I see:
CONFIG_NET_ETHERNET=y
So it looks like a compile-time option, and the EMC2 application just
uses that.
And our RTAI environment probably wouldn't help much toward RT sending
of UDP packest, because we'd still be using the linux kernel (non-RT) to
push them out.
But there's likely to be various open-source UDP implementations around.
> BTW: what do you think about PTP (IEEE 1588)?
I'd not previously seen that. However, high timing precision (or even
resolution) doesn't necessarily indicate high throughput, or even
frequent transmissions, I think.
Hold on a moment ... Not using parport myself, it's only belatedly
occurred to me: why not just drop in a PCI parport card?
(And skip all this fun serial stuff? :-)
Erik
--
In all affairs it's a healthy thing now and then to hang a question
mark on the things you have long taken for granted.
-- Bertrand Russell
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