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