On Sunday 21 July 2019 13:20:37 andy pugh wrote:

> On Thu, 18 Jul 2019 at 21:47, Pedro Grijalva <[email protected]> 
wrote:
> > Hi I'Interested on run Linuxcnc on RP4
> > can you share the steps ?
>
> I have put the SD card image _temporarily_ here:
> http://www.linuxcnc.org/dists/buster/2.8-uspace/
>
> Note that this is a run-in-place setup, as the debian packaging isn't
> set up quite right for Raspberry Pi.
> This means that you need to type this at the command-line to run it.
> (and yes, it really is dot space dot slash)
> . ./linuxcnc-dev/scripts/rip-environment
> linuxcnc
>
> (or latency-test to run the latency test)
>
> Please only download this if you have a Pi4 and genuinely want to
> experiment, for the sake of the web site bandwith limits.

I am dl'ing it, and will get a pi4, and whatever card seems to be the 
correct interface. Someone mentioned the 7i76E? but I've doubts it can 
what I am doing.

To dup what I am doing with the 7i90HD and a stack of 7i42TA's, I'll need 
3 encoders, two stepgens, a pwm with direction for the vfd, two in's for 
homes, and several outs. I don't think the 7i76D's I have can supply the 
2nd and 3rd encoders for the jog dials.

So what do I use?

A 7i90 with an ethernet connector might work, but what it has is rs422, 
and likely too slow at 10 megabits. OTOH, if it can do spi at 50 
megabits...  Actually I am writing at 42Mb and reading at 25Mb, and 
thats working fairly well under stretch right now.

Cheers, Gene Heskett
-- 
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>


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