On 3/28/21 1:39 PM, Jon Elson wrote:
I was wondering if there was any possibility that LinuxCNC could
support the Beagle Bone and Charles Steinkuehler's driver for the
PRU. This does software stepping with quite decent
performance by moving the "base thread" into the PRU processors (200
MHz 32-bit RISC attached CPUs). This has been shown to work nicely
for small stepper-driven machines.
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.
https://forum.linuxcnc.org/18-computer/36879-raspberry-pi-4-mmap?start=480#203601
https://forum.linuxcnc.org/media/kunena/attachments/16508/edit-hal_pi_gpio10_2021-03-25.c
https://forum.linuxcnc.org/media/kunena/attachments/16508/drv8825-dblstep.ini
https://forum.linuxcnc.org/media/kunena/attachments/16508/drv8825-dblstep.hal
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