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MX_Master wrote:

Hi, guys. Let me introduce a tiny project of mine..

My first single board PC was the Orange Pi One. And it's really fun to use such boards for a hobby projects But we also can use them as a small CNC controllers too. It's really sad there are no armhf packages in the LinuCNC dists repo. So my first try was the Machinekit with RT-PREEMPT kernel built using Armbian. And it works. But without a GPIO driver it was just a simulator. After a few weeks of learning I made a GPIO driver by myself. And it works just fine

My next step of researching was a "big latency" issue (50-70 us). Many ARM boards has a worst latency values using the RT-PREEMPT kernel. A steps rate with such latency values was terrible. A few months later I found an info about additional built-in RISC CPU core. Using this core for the fast pins toggling was a good idea

At this moment I have a working pair of HAL driver and the RISC core firmware. Steps rate now very high (up to 1 MHz). Also I made a quick installer script. You need one of the Armbian images to install it. Supported boards are Nano/Banana/Orange Pi with Allwinner H3 SoCs installed.

Attention! Project support is ended. Use it on your own risc.

allwincnc.github.io

Love the "Use at your own RISC"!!

Which combination of cards do you have?

Oops should have read the title.

That's a fairly odd combination, what hardware interfaces do you need?
There is no standard firmware for the combination, but it can be built easily
 

The different frontends share a common back-end.

They are all almost identical behind the scenes.

So likely a bug.

Perhaps LinuxCNC calculates that your machine is not capable of attaining that level of accuracy.

Like maybe your microstepping moves 0.1mm at a time say, then you can have 0.08 and -.0.02, but nothing in-between

This one time, LinuxCNC started acting super random.

I restarted my PC and everything was fine.

I have no idea why it started acting super wierd.

Do you have 3 belts?

Try to make the design as simple as possible to make troubleshooting easier.

There's 7I76+7I85S firmware for a 7I80DB but not for the 7I76+7I85.
I can make this if you tell me which version of the 7I80DB you have (-16 or -25)

Note that Sserial cards don't need any card specific support in the firmware.
(as long as there is a sserial port, any sserial card is supported)

The 7I76 has 1 free sserial port and the 7I85 has 5 free sserial ports.

Just did that and it seems possible. Now the next question, which bit file should i use for this configuration (7i80-DB + 7i85 and 7i76 with the 7i87 connected to the 7i76)? thank u

I was running this computer over a year on 2.9.x with no problems.
Anything is worth a try, new Intel card on order. It should be here tomorrow.

Do double check this, but it should be possible to just wire the 7i87 to 7i76 using a cut off LAN cable, the Smart Serial connector, info on exact wiring is on the 7i76 manual.

BloodyT wrote:

....successfully got my pi5 running with LinuxCNC 2.10 (which I read is required to run a 7i95T).
 

Where did you read that? I would really like to delete that as it is just adding to the "buy a RPI" sickness spreading all over the web.
RPI is NOT required to run, it CAN be used to run LinuxCNC, any PC can be used to run LinuxCNC and Mesa cards.
-
On the Mesa subject, i do have somewhere a working 7i95 config if you need one, without the 7i77.
As for firmware, please do not proceed without consulting with PCW here, you seem to be bumping into some fishy info...
And for next time, when you have a 7i95 and you need to add analog outputs, use a 7i83 as 7i95 has encoder inputs. That is if you do not need all of the stepgens and encoders and analog outs and encoders...

Hello everyone,
I have a set-up consisting of a MESA 7i80-DB connected to two daughtercards, 7i76 for stepper motor control + a 7i85 additional board. I would like to add a third board, MESA 7i87, to read some analog sensors.
Do you know if this is possible or not? Is there a LinuxCNC firmware for this configuration?

Hello, 

i am beginner and (so far I can tell right know) successfully got my pi5 running with LinuxCNC 2.10 (which I read is required to run a 7i95T).
Sadly pncconf has no template for the Card, nor the combination of cards. So I decided to give mesact a try which at least knows the cards I got.
for my understanding, I need a firmware file to flash on my 7i95T to make the daughter card addressable. is that correct?
After downloading the firmware of the card and saving to the mentioned folder I recognized there is no firmware on the Mesa website available for my combination of cards?! or am I missing something? <screenshot appended>
can somebody help me out with it?

 

If I understand the source of the hostmot2 driver correctly, it is limiting the acceleration and also the driver does the encoder scaling.

This will make the firmware a bit more complicated, but I really want to use the original EtherCAT source already in LinuxCNC, and not develop a driver. This HW should be plug-and-play

i think i finished the prototype stage, all of the prototype faults are corrected, pcb updated, Linuxcnc HAL Driver finished with safety mechanism (watchdog + jump code checksum, (also in the pico)), added optional lcd connector(128x64 sh1106) to the pcb, python library is ready for other uses (experimenting, remote io, etc....)