Aerospace Protocols¶
Avionics data bus and software loading protocols for safety-critical flight systems. All implementations follow DO-178C coding standards with deterministic execution and full bit-level correctness verification.
Protocols¶
| Protocol | Standard | Description | Status |
|---|---|---|---|
| ARINC 429 | ARINC 429-18 | Unidirectional avionics data bus (32-bit words) | ✅ Implemented |
| ARINC 664 | ARINC 664 Part 7 | AFDX Deterministic Ethernet for avionics | ✅ Implemented |
| ARINC 653 | ARINC 653 Part 1 | APEX Time/space partitioned RTOS API | 🔲 Planned |
| ARINC 665 | ARINC 665-3 | Loadable Software Part packaging | 🔲 Planned |
| ARINC 615A | ARINC 615A-4 | Ethernet data loading protocol | ✅ Implemented |
Common Characteristics¶
All aerospace protocol implementations share:
- Bit-level accuracy Every bit position matches the ARINC specification
- Parity/CRC verification Data integrity checked on encode and decode
- Pure functions Encode/decode operations are stateless and thread-safe
- No heap allocation All operations work on caller-provided buffers
- Round-trip verification Every test encodes then decodes, verifying equality
Avionics Network Architecture¶
┌─────────────────────────────────────────────────────────────┐
│ Aircraft Avionics Bay │
├─────────────────────────────────────────────────────────────┤
│ │
│ ┌─────────┐ ARINC 429 ┌─────────┐ │
│ │ ADC │───────────────► │ FCC │ │
│ │(Air Data)│ (100 kHz) │(Flight │ │
│ └─────────┘ │Computer)│ │
│ └────┬────┘ │
│ │ │
│ ┌─────────┐ AFDX (664) ┌────▼────┐ ARINC 615A │
│ │ EFIS │◄══════════════► │ Core │◄═══════════════► │
│ │(Display)│ (100 Mbps) │ Switch │ (Data Load) │
│ └─────────┘ └────┬────┘ │
│ │ │
│ ┌─────────┐ AFDX (664) ┌────▼────┐ │
│ │ TCAS │◄══════════════► │ IMA │ │
│ │(Traffic)│ (VL-based) │ (653) │ │
│ └─────────┘ └─────────┘ │
│ │
└─────────────────────────────────────────────────────────────┘