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LucianoDev 4891eb6812 feat: redesign bench calibration (factor/offset), add Ttank/P2 displays, fix sensor calibration

- Replace P1-P6 rational transfer function with factor/offset model for bench params
- Add explicit rx/tx direction flags in bench XML configuration
- Add T.Tank (BenchTemp) and P2 (AnalogSensor2) to temperature/pressure display
- Apply SensorConfiguration calibration to pressure channels, fix empty sensors.xml fallback
- Add live value labels to flowmeter charts
- Hide pump live values and PSG encoder standalone label
- Add K-Line connection state model, improve KWP service and status displays
- Restructure .claude/skills into subdirectory format

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-04-14 21:25:30 +02:00

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VP44 Protocol Reference

Quick reference for hardware protocol constants used in HC_APTBS. Consult this before modifying any protocol-related code.

DFI encoding (EEPROM address 0x0044 on VP44 ECU)

Read (raw byte → DFI value):

dfi = (sbyte)raw * 3.0 / 256.0

Write (DFI value → raw byte):

raw = (sbyte)((dfi * 256.0f) / 3.0f)
// If raw == 0, use 1 — the ECU rejects zero

Checksum:

checksum = (byte)(0 - (byte)rawValue)

IIR low-pass filter (PcanAdapter.PassFilterUpdate)

result = Math.Round(prev + alpha * (value - prev), 4)

Used to smooth CAN bus sensor readings. The alpha coefficient controls responsiveness vs. noise rejection.

OEM legitimation (PcanAdapter.Connect)

token = (20120378UL << 32) | 21200UL

Sent as a CAN frame to authenticate with the bench controller. Without this, the bench ignores all commands.

K-Line / KWP timing

Inter-byte delay (KW1281Connection.SendPacket):

Thread.Sleep(5)  // after each byte — KWP protocol requirement, NOT a workaround

5-baud slow-init (KwpCommon.WakeUp):

Bit-bangs the ECU address at 5 baud on the K-Line
Sleep durations in WakeUp are protocol-mandated — do not change

Session lifetime:

One FtdiInterface open/close per KWP operation
ECU expects a fresh session per dialog — do not pool connections

CAN bus (PCAN-Basic, 500 kbps)

Channel: PCAN_USBBUS1
Baud: PCAN_BAUD_500K
Read thread polls with Thread.Sleep(2) in DrainMessageQueue (known debt)

Caution

Do not change any of these values without understanding the hardware protocol specification. Incorrect values can cause ECU communication failures or bench malfunction.

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