CRSF MicroArch Doc
Rough Notes
Crossfire Communication Protocol
Operates on the 900MHz band frequency
Allows for better signal penetration through objects
Reduces variable latency between CRSF and OpenTx modules
Uses openTx
Single wire half duplex communication
Master sends 1 frame every 4ms, slave replies between 2 frames from the master
420000 baud
Not inverted
Big endian
BetaFlight:
Has a struct that contains data about the connection status and strength such as RSSI
One for uplink RSSI
One for downlink RSSI
23.02.14 Note: Formal Doc (Currently just template, will be updated soon)
Principle Engineer | @Hailey Doleweerd |
Forced to Review | @Christopher Chung @Anthony Luo |
Dragged Along |
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Uplifted |
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Objective | Add Crossfire communication capability to LOS |
Due date | Apr 7, 2023 |
Key outcomes | Design and implement a driver that utilizes Crossfire to replace ppm between RC Link and the Flight Controller. |
Status | DESIGN |
Problem Statement
Design and implement a driver that utilizes Crossfire to replace ppm between RC Link and the Flight Controller.
Scope
Current Must Haves: | |
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Future Expansion: | |
Not in scope: |
Tasks Break Down:
Timeline
This will be determined in a future microarch revision, once the general architecture of the driver is further complete.
Implementation Details (Insert LOS_Interface object specs here)
Actions Items
Milestones and deadlines
Milestone | Owner | Deadline | Status |
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Approved Interface Structure |
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Coding |
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Driver Testing |
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Interface Testing |
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Open Questions
What is the performance & reliability of SDMMC versus SPI?