The Rockchip and the Allwinner SOC's have integrated microcontrollers as well for software stepping at high speeds.

https://forum.linuxcnc.org/18-computer/39037-linuxcnc-orange-pi?start=30

On 6/19/20 2:55 PM, John Dammeyer wrote:
A Pi isn't the most suitable unit for that sort of thing.   The BeagleBone has 
two hardware QEI devices.  Alternatively there are other processors out there 
that have the hardware interface.


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