LinuxCNC-RIO - RealtimeIO for LinuxCNC based on FPGA (ICE40 / ECP5)

Hey, that’s a bit mean – I want a board like that too

Yes, that really is strange, but I can’t explain it at the moment and I’d be glad if I knew the solution.

All I can do here is take some more measurements; I’ll connect it to a logic analyser again and record the pulses for a bit longer to check them.
But on that board too, please measure the voltage arriving at the driver.

That board looks really good

Looks ok for me

Why doesn't anyone tell me that there's been a Rio Board in China for three years now?
www.ruten.com.tw/item/22418437051883/

cool

and a video: www.bilibili.com/video/BV15nG96kEQt/

If this is a drive level issue, note that a 26C31 does not swing to 5V
and its output level is about 2 diode drops below 5V (3.6V) with a 5 mA load.

PCW wrote:

If this is a drive level issue, note that a 26C31 does not swing to 5V
and its output level is about 2 diode drops below 5V (3.6V) with a 5 mA load.

I connected the motor driver using +5V and A-.
 

Meister, if you were in Taiwan, I would definitely buy one for you. This Riocore ICEBreaker V1.0e circuit board should be a 2026 product; I bought it on Taobao in China in June 2026. At the time, I asked the China seller about a DM542 zero-point positioning error, and the China seller tested it and got the same result. He recommended I discuss it on the Linux CNC forum.