On Fri, 14 Aug 2015, Thomas Gambone II wrote:
Date: Fri, 14 Aug 2015 13:22:07 -0400
From: Thomas Gambone II tgamb...@comtime.com
To: EMC developers emc-developers@lists.sourceforge.net
Cc: Jeff Epler jep...@unpythonic.net
Subject: [Emc-developers] LinuxCNC on ARM + Mesa
Hello all!
First time mailing back to the list.
Wanted to ask the list / Jeff Epler a couple specific questions related to
his work on the ARM platform (Odroid U3) + Mesa 7i90 (SPI).
In looking through the available daughter cards from Mesa, there's nothing
quite as nice as the 7i76, 7i77, or 7i78 (DB25) boards available with the
HD50 interface (kind used by 7i90).
Notably, I don't see any card in the HD50 family that has built in stepgen.
You can use a 7I52S or 7I47
You can also use any of the DB25 daughtercards with a proper (hand made) cable
I intend to make a 4x 26 pin header version of the 7I90 when I get a
chance to make using DB25 daughtercards easier
What card(s) can you recommend to use with the 7i90 for general 3-axis+ CNC
control.
As well, in reading the detailed version of Jeff's blog post regarding the
Odroid U3 (http://emergent.unpythonic.net/odroid-u3), he mentions that
because the ethernet connection on the board is connected via USB[2.0] it
is no good for use with hostmot2_eth.
I've got a new XU4, which is basically the U3, with a beefier octa-core
processor (still Samsung Exynos) and USB3.0 ports. The ethernet is hooked
in via USB3.0 and is gigabit on this board.
Would it be possible to use a hostmot2_eth board (like the 7i76E) with a
USB3.0 to gigabit ethernet connection?
Thank you,
-Tom
Maybe, but USB Ethernet interfaces seem to have occasional long latencies
I can run hm2_eth cards on my USB-1GE dongle for maybe an hour or so before I
get a 8 ms latency.
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