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3. Connection description
3.1 USB power supply
After the SKR 3 board has been powered，the Red led D7(Power) to the upper
right of the MCU will light up, indicating power on. When using only USB to
power the boar, Please insert the jumper cap onto the VUSB jumper.
3.2 Stepper driver
3.2.1 STEP/DIR(STANDALONE) mode
i.e：A4988、DRV8825、LV8729、ST820 etc，connect jumpers(MS0-MS2) according to
the microstep chart
Note：RST and SLP must be shorted by jumpers for A4988 or DRV8825.
DRV8825 ELSE
MS2 MS3
MS1 MS2
MS0 MS1
RST/SLP
