Luca
c32c4645b5
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
24 lines
951 B
JSON
24 lines
951 B
JSON
{
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"_comment": "First best-guess filter, built from files/PTCAN_protocol.md + the clean isolated-bus test on 2026-08-29 (gateway_20260829_164540.csv). Blocks IDs that are almost certainly irrelevant to EPS assist function: VIN, MFL buttons, diagnostics/ISO-TP, DME temps+fuel, cluster warning-lamp broadcast, and other modules' generic status heartbeats (not 0x4B0/0x1FB - those are the EPS's OWN transmissions, confirmed on the isolated bus, not something the car needs to send it). Everything else stays allowed until tested. See eps-comms/findings.md.",
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"car_to_eps": {
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"default_allow": true,
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"overrides": {
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"896": false,
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"470": false,
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"464": false,
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"436": false,
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"1152": false,
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"1170": false,
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"1175": false,
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"1193": false,
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"1408": false,
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"1426": false,
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"1449": false,
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"1472": false
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}
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},
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"eps_to_car": {
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"default_allow": true,
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"overrides": {}
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}
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}
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