KaraZajac
48 lines
1.5 KiB
Markdown
48 lines
1.5 KiB
Markdown
---
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layout: default
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---
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# Kia V5 Protocol
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**Rust module:** `src/protocols/kia_v5.rs`
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**Reference:** `REFERENCES/ProtoPirate/protocols/kia_v5.c`
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## Overview
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Kia V5 uses Manchester encoding at 400/800 µs with **opposite polarity** to V1/V2: level true → ShortHigh, level false → ShortLow. 64 data bits + 3-bit CRC (67 bits on air). Preamble: 40+ short/long pairs; then LONG HIGH (sync), SHORT LOW (alignment), then Manchester data. Counter is encrypted with a custom mixer cipher using the KIA V5 key (YEK); serial/button from YEK.
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## Timing
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| Parameter | Value | Notes |
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|-----------|--------|---------|
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| Short | 400 µs | ±150 µs |
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| Long | 800 µs | ±150 µs |
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| Min bits | 64 | (+ 3 CRC) |
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## Encoding
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Manchester with V5 polarity (level ? ShortHigh : ShortLow).
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## Frame Layout
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- Preamble (40+ pairs) → sync (long HIGH) → alignment (short LOW) → 64 Manchester bits → 3 CRC bits.
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- 64-bit key (YEK) = bit-reverse of stored value; serial/button/counter extracted from YEK; counter half is mixer-decrypted with keystore V5 key.
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## Decoder Steps
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1. **Reset** — Wait for preamble.
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2. **CheckPreamble** — Count pairs; detect sync and alignment.
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3. **Data** — Manchester decode 67 bits; extract YEK, mixer-decode counter, validate CRC.
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## Encoder
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Decode-only in KAT (reference has encoder under ENABLE_EMULATE_FEATURE).
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## Frequencies
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433.92 MHz.
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## Keystore
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Requires KIA V5 mixer key (keystore type 13, `kia_v5_key`). Used for mixer decryption of counter.
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