lucavanstraaten/BMW_E8x_EPS
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BMW_E8x_EPS/can-io/gui
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Luca c32c4645b5 Reverse-engineer BMW E8x EPS for standalone operation 
Tooling and findings for running an E8x/E9x electric power steering unit
outside its donor car, e.g. in an EV conversion.

Headline result: the EPS needs only two CAN messages plus a 12V enable
wire, not the 69-message set the car puts on the bus:
  0x130 CAS terminal status (100ms) brings the unit up
  0x1A0 DSC road speed (20ms) sets the assist level
Total required rate is 60 frames/s. Protocol write-up, including what is
proven vs. inferred and the open questions, is in eps-comms/.

Contents:
  adapters/   CANdapter (its SLCAN dialect differs) and generic SLCAN
  gateway/    car<->EPS relay, replay, message bench, EPS controller,
              4-tab Streamlit UI
  decoder/    PT-CAN frame decoding and live/replay sources
  can-io/     XIAO ESP32-S3 firmware: CAN IO board + USB-CAN bridge with
              a CAN-independent digital IO channel
  tools/      capture, bitrate scan, startup-order and session analysis,
              checksum solver
  captures/   reference working session + the replay set eps_control reads
2026-08-29 19:34:43 +02:00
..
can_io_gui.py Reverse-engineer BMW E8x EPS for standalone operation 2026-08-29 19:34:43 +02:00
README.md Reverse-engineer BMW E8x EPS for standalone operation 2026-08-29 19:34:43 +02:00
requirements.txt Reverse-engineer BMW E8x EPS for standalone operation 2026-08-29 19:34:43 +02:00

README.md

CAN IO Board GUI

Tkinter front-end for the CAN IO board via an SLCAN serial adapter.

pip install -r requirements.txt
python can_io_gui.py
  1. Pick the SLCAN device's serial port (⟳ refreshes the list).
  2. Bitrate 500000 and base ID 0x100 match the firmware defaults.
  3. Connect — the GUI requests status automatically and then tracks the board's heartbeat/change frames.

Green LED = active input / energised output. Buttons send SET_OUTPUT / TOGGLE commands; the board confirms with a status frame, which is what actually updates the display. Frame formats: ../PROTOCOL.md.