( list apology, I seem to have replied to posters rather than to the
list, and several times :-(
re SPI comms Linuxcnc SBC microcontrollers ...
it has been said on this mail list,
that SPI is a good candidate for a bus technology to work _with_ realtime.
heres some work in that vein (maybe overlooked)
yeltrow's work:
a generic spi hal module so you can use other SPI devices ( rpi,
arduino, mcp23s17, ENC28J60, theres a lot of spi stuff to hang onto such
a bus )
https://www.forum.linuxcnc.org/24-hal-components/28851-spi-bus-generic-driver-and-st-l6480
the files are on the forum for members linuxcnc-upload-2015-12-03.tar
erste's work:
for ethernet circumventing usb ( via spi
interesting as spi and ethernet seem to be future avenues
http://erste.de/ethraw/README
theres other efforts but less coupled to the spi grail
tomp
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