Gene hello
On 03/27/2019 08:13 PM, Gene Heskett wrote:
On Wednesday 27 March 2019 08:12:48 TJoseph Powderly wrote:
( 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
Interesting driver for the big stuffs. However, I wonder if yeltrow is
aware of rpspi.ko, now part of LCNC. Not parport based but gpio,
written specificly for the rpi3b. And I'm using it, writing to a Mesa
7i90 at 42 megabaud, and reading back from the 7i90 at 25 megabaud
useing only 4 gpio pins for 2 or 3 target devices.
I dont find source rpspi.c in my sources.
cant google it except to find messages from you.
My RIP source tree is DGarr's external offset branch.
I dont have raspi.kp either.
Where are these files?
The files I was speaking of were generic spi utilities,
not RPi to Mesa communication modules,
They were attempts to make SPI available on any hardware platform to any
SPI device.
They are attempts only ( one uses a parport but i guess that could be
altered to gpio )
But from the parport, the author connects to many different SPI devices.
What file builds rpspi.ko ?
Maybe its private/unpublished work from Matsche ?
I cant find it on https://github.com/LinuxCNC/linuxcnc either.
Plz lemmeno
TomP
Perusal of that code might be of help to yeltrow. gpio seems to be about
10x faster than trying to simulate SPI over a parport. The 7i90 has
both modes depending on the firmware loaded.
the files are on the forum for members linuxcnc-upload-2015-12-03.tar
So this work handily predates rpspi.ko. Still, theres obviously things to
be learned from the rpi version.
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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Cheers, Gene Heskett
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