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Hi PCW,

Thanks for your reply, I was told they were working when I bought the machine but haven't been in a position to start fault finding yet or check that this is true. (The guy I bought it from didn't know what the problem actually was though, so everything needs to be checked).

I'll report back after a month or two and I'll look into those boards you mentioned.

Thanks again for replying and any other help you can think of

Pat

The first P1 encoder is  encoder 1 so the position would be:

hm2_7i96s.0.encoder.01.position

and the most important parameter for that encoder would be:

hm2_7i96s.0.encoder.01.scale


 

What I would do is get a basic working configuration with pncconf.
This means setting the machine limits, scaling, directions, timings,
velocities, and accelerations. Once this is working I would then worry
about tuning for best performance and  special features like drive fault
operation.

That is, don't get the sandpaper out when you are still in the chainsaw stage.

 

The real time thing in the kernel seems a little confusing at the moment.

Unless a change is made to the /arch/Kconfig file you are unable to select a fully_preemptible kernel, which would appear the one required for Linuxcnc, the available info refers to this as RTOS. I'm not exactly clear about the amd64 kernel, as ATM I've only been interested in arm64 and specifically the bcm2712 kernel. I have tried the change the above mentioned file and can confirm the behavior.

Unfortunately I don't have a free SD card for testing and unable to get out to obtain one. So I can't comment on the kernel when booted, which is frustrating as I like to test things before commenting.

There is also the ability to select the type of real time kernel with via the kernel command line.

I'm trying to be a bit more "socially acceptable" for the coming new year, but yes that would be the way to go.

It would seem it didn't go over your head.

Yeah, now it dawns on me that it already has scaling built in, from -1 to 1 i think, so that is sorted.
Pretty sure it can make do without it, but it is a nice to have.
Again, fuzzy, but roughly in hal
net shorted-move-back motion.adaptive-feed hm2_7i96s.0.inm.00.input-10
yeaaaah that wont work...
setp ....
dropping the towel...
Aciera, HELP
Sorry, but i really need rest, it is 3AM here.

Some great info there.
Thanks Andy.

Through luck and a Google search, I have found: www.forum.linuxcnc.org/38-general-linuxc...learpath-sdsk#112579

It doesn't mention HLFB in the title at all, which is why it took me this long to find it, but it looks like there is a clue about how to start the process of integrating it. Unfortunately, it's an editing of HAL step, and I still don't know where to start in pncconf. How do I assign these pins in pncconf?

Just start a new thread that is quite easy.
Have you a link to the kits that "don't offer access to the SD card" ?

As far as I have been able to see there has been no major hardware updates to the RPi5. Or are you referring to the ability to boot from NVME ?

When claims like that are made it would be nice to provide a link, it's rather frustrating for someone to mention something like that with no references, as this would be a major shake up for the RPi platform.

Does this patch allow you to select fully preemptible kernel, when configuring the kernel ?

From my experience building with the mainline rt "patch" it was required to edit kconfig under arch. Otherwise there were only 3 options for RT kernel, which didn't include the fully preemptible option.