LinuxCNC + Orange Pi

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07 May 2020 14:57 - 28 Jul 2020 17:16 #166968 by MX_Master
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 :cheer:

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 B)

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 H2+/H3 SoCs installed.

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Last edit: 28 Jul 2020 17:16 by MX_Master.
The following user(s) said Thank You: Mike_Eitel, thefabricator03, Blake_Volpex, marian, fb, gello0

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07 May 2020 17:05 #166973 by tommylight
Replied by tommylight on topic LinuxCNC + Orange Pi
buildbot.linuxcnc.org/dists/buster/maste...reempt/binary-armhf/
Latest armf 2.9 version, deb ready to install for Stretch.
The following user(s) said Thank You: MX_Master

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07 May 2020 18:12 #166977 by Hakan
Replied by Hakan on topic LinuxCNC + Orange Pi
Amazing. I have to test this.

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09 May 2020 14:33 #167148 by Hakan
Replied by Hakan on topic LinuxCNC + Orange Pi
What do you think of making an encoder module that runs in the RISC cpu?
How fast can it sample in-signals, would you say?

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09 May 2020 17:02 #167156 by MX_Master
Replied by MX_Master on topic LinuxCNC + Orange Pi

Hakan wrote: What do you think of making an encoder module that runs in the RISC cpu?
How fast can it sample in-signals, would you say?

A RISC core can sample the AB sequences pretty fast. Max input frequency can be up to 200-400 kHz. But I haven't any high res encoders to test it. So these rates are theoretical maximum (based on output rates).

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10 May 2020 17:30 #167290 by Bari
Replied by Bari on topic LinuxCNC + Orange Pi
Very nice. We had some Allwinner devices running LinuxCNC back in '13-'14. Back then the mali GPU was still closed and there was no info on the integrated microcontroller.

Machinekit could have used these and come up with a working system as well. Nice to see that you have the ARISC core going now for software stepping.

This system can be more open source than the Rpi4 since it requires no giant video blob.

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18 May 2020 21:34 #168192 by marian
Replied by marian on topic LinuxCNC + Orange Pi
Thanks for your effort on this project. I really like it!
Looks very promising to me. Documentation looks also great.
In my opinion it would suit the gap between Laptop+GRBL and full sized LCNC(+MESA) quite well.

Just ordered an orangepi zero plus 2 H3 (due to emmc and no need for a lot of IOs).
Hope the 512Mb Ram is enough.

I am looking forward to test this on my mills and mini-lathe.

Besides closed loop, an encoder module would allow for threading on the lathe/mill as well as rigid tapping.
PWMgen would also be useful to people who use some of these 0-10V controllable spindles from Kress/AMB or Mafell (mostly Europe).

Sadly i am not a experienced programmer, but i will dig into your code and try to understand how it works.
I will also try to keep up on your thread on cnc-club.ru via google translate...

Keep up the good work!

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18 May 2020 22:08 #168196 by PCW
Replied by PCW on topic LinuxCNC + Orange Pi
It seems like the LinuxCNC encoder component would be a good starting
point for encoder support in the attached processor.

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19 May 2020 04:10 #168226 by MX_Master
Replied by MX_Master on topic LinuxCNC + Orange Pi
arisc_pwmgen/arisc_encoder will be added soon..

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19 May 2020 20:16 - 19 May 2020 20:56 #168297 by Blake_Volpex
Replied by Blake_Volpex on topic LinuxCNC + Orange Pi
I've bean looking for a compact setup to use on a small CNC mill.
This looks perfect.
I'm about to order a Orange Pi Plus 2E and some TMC5160TA drivers, that should cover most of my needs.

Edit: I'm not any good with Russian, but I've bean reading through your other thread, it looks like you're working on an Orange H6 board.
But aren't seeing any performance gains.

Right now the H3 board is the best supported, but I wonder which will be better in a month.
Last edit: 19 May 2020 20:56 by Blake_Volpex.

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