24. X3 Motor Control Unit
This page is for the scooter Motor Control Unit.
In scooter discussions, MCU usually means Motor Control Unit. To avoid confusion, this wiki uses chip, CPU, or microcontroller when talking about the processor on a board.
Early guide / notes.
Current working assumption:
- X3 Motor Control Unit hardware is probably the same across X3 scooters;
- pinout appears to be the same;
- confidence is high, but not 100 percent confirmed across every model.
The VCU is the Vehicle Control Unit.
The Motor Control Unit is a separate scooter module. The VCU and Motor Control Unit communicate over CAN bus.
x3utils can be used around both concepts, but the wiring and procedure should be documented separately.
Use:
A - Default / Blinker buttons
With current Motor Control Unit firmware, SWD appears to remain available, so connect-under-reset is not normally needed.
TBD
Confirm the pin labels from the photo before using this as a final guide.
Expected useful signals:
SWDIOSWCLKGND- 3.3 V reference / power note
TBD
Document the safe power method clearly.
Do not connect multiple power sources unless the final guide explicitly says it is safe.
TBD
First test should still be a full dump before any flashing.
TBD
If the same Motor Control Unit board is confirmed across more models, document the evidence here.
Useful contributions:
- clear photos of the Motor Control Unit board;
- ST-LINK pinout confirmation;
- successful dump notes;
- successful flash notes;
- firmware version notes such as
mcu_v1.x.x.