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
