KaraZajac
50 lines
1.5 KiB
Markdown
50 lines
1.5 KiB
Markdown
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layout: default
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---
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# Star Line Protocol
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**Rust module:** `src/protocols/star_line.rs`
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**Reference:** `REFERENCES/ProtoPirate/protocols/star_line.c`
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## Overview
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Star Line uses PWM: 250 µs = 0, 500 µs = 1. 64 bits: key_fix (32) + key_hop (32), sent MSB-first (reversed on air). Header: 6 pairs of 1000 µs HIGH + 1000 µs LOW. KeeLoq: fix = serial(24) + button(8); hop encrypted with manufacturer key or normal-learning derived key.
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## Timing
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| Parameter | Value | Notes |
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|-----------|---------|---------|
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| Short (0) | 250 µs | ±120 µs |
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| Long (1) | 500 µs | ±120 µs |
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| Header | 1000 µs × 2 (6 pairs) | |
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| Min bits | 64 | |
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## Encoding
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PWM; 64 bits MSB-first (reversed on air). KeeLoq encrypt for hop; fix half plain.
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## Frame Layout (64 bits)
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- **key_fix (32 bits):** serial (24) + button (8).
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- **key_hop (32 bits):** KeeLoq-encrypted rolling code (MF key or normal-learning key).
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## Decoder Steps
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1. **Reset** — Wait for header (6 × 1000 µs HIGH, 1000 µs LOW).
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2. **CheckPreamble** — Confirm 6 header pairs.
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3. **SaveDuration** — Store duration.
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4. **CheckDuration** — Short–short = 0, long–long = 1; at 64 bits KeeLoq-decrypt hop (or normal-learning), extract serial/button/counter, return.
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## Encoder
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Supported; header, 64-bit fix+hop (KeeLoq encrypt hop with MF or derived key).
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## Frequencies
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433.92 MHz.
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## Keystore
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Star Line manufacturer key (keystore type 20, `star_line_mf_key`). Used for KeeLoq hop decryption and normal-learning derivation.
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