I see this was asked once before and not answered. Are the end-stop pins interrupt-capable? I'd like to turn off polling if I can.
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OK, thanks
the marlin firmware has not enable the end-stop pins interrupt-capable by default as shown in configuration.h //#define ENDSTOP_INTERRUPTS_FEATURE
the end-stop pins are been read from the stepper motor interrupt function every time, so no need to set the end-stop pins as interrupt-capable.