On 3/28/21 7:49 PM, Jon Elson wrote:
Not sure why the OrangePi LCNC project didn't just try to get this
going on the Allwinners since they have an integrated micro for high
speed stepping and a GPU to support a HD res 30+ fps GUI.
https://orangecnc.gitlab.io/
Tom P did just post this work for Rpi and Opi's to do double stepping
using the GPIO from the main CPU cores.
Well, that's nothing like the PRU "driver" that Charles put together.
It looks about the same as an X86 with at least a 20 KHz base thread.
The Pi definitely has better graphics support than the Bone,
but it is mostly tolerable.
Not sure which you are comparing to the PRU "driver".
But just to be clear, the Orangecnc fork of LinuxCNC for the OrangePi
https://gitlab.com/orangecnc Steps as fast as the PRU's in the BBB but
the driver is currently broken. Maybe they were not aware of the work in
machinekit using the PRU's. Maybe the PRU "driver" that Charles put
together would have helped them.
I just pointed out Tom P's work for Rpi and Opi for faster software
stepping using the main ARM cores and GPIO without use of internal
microcontroller. For applications where that is fast enough.
-Bari
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