KAT/docs/kia_v1.md

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Kia V1 Protocol

Rust module: src/protocols/kia_v1.rs
Reference: REFERENCES/ProtoPirate/protocols/kia_v1.c

Overview

Kia V1 uses Manchester encoding at 800/1600 µs. 57 bits total: 32 serial + 8 button + 12 counter + 4 CRC. Long preamble (~90 long pairs). CRC4 with offset rules (cnt_high 0 vs ≥ 6).

Timing

Parameter	Value	Notes
Short	800 µs	±200 µs
Long	1600 µs	±200 µs
Min bits	57

Encoding

Manchester: symbol duration short or long; bit value from transition direction.

Frame Layout (57 bits)

• 32 bits: serial
• 8 bits: button
• 12 bits: counter
• 4 bits: CRC4 (checksum with offset rules)

Decoder Steps

1. Reset — Wait for long pulse (preamble).
2. CheckPreamble — Count long pairs until enough; then transition to data.
3. DecodeData — Manchester decode; at 57 bits validate CRC4 and return.

Encoder

Supported; builds preamble and Manchester-encoded 57-bit frame.

Frequencies

433.92 MHz.