Can the ELRS airport feature do SBUS passthrough as illustrated? | ExpressLRS Community | Page 1

lucid thorn Apr 12, 2023, 2:10 PM

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I have a PC generating SBUS control packets. Can I use the airport feature to basically carry pure SBUS from PC to FC?

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I wouldn't have to flash ELRS firmware to output SBUS or anything like that, correct? It would just have to be flashed to airport mode?

queen schooner Apr 12, 2023, 6:54 PM

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No, airport uses uses 8 bit no parity 1 stop bit - SBUS is 8 bit Even parity 2 stop bits so it's not compatible. On the FC side it's going to be coded that way.

lucid thorn Apr 12, 2023, 7:12 PM

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queen schooner No, airport uses uses 8 bit no parity 1 stop bit - SBUS is 8 bit Even parity 2 s...

Thanks, this probably saved me a lot of trouble

queen schooner Apr 12, 2023, 7:14 PM

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It's rather annoying that SBUS choose that, oh and it's also inverted as well.

lucid thorn Apr 12, 2023, 7:18 PM

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i'll have to look if its worth trying to fix in the code. Either I tweak Airport to do SBUS,
Or I tweak the PC code to send MSP or ELRS instead of SBUS 🤷‍♂️

queen schooner Apr 12, 2023, 7:20 PM

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On the RX side of things we have SBUS already. In the master branch.

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so PC -> CRSF -> TX -> ELRS-OTA -> RX -> SBUS -> FC

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Or just use CRSF all the way

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https://github.com/ExpressLRS/ExpressLRS/wiki/CRSF-Protocol

GitHub

CRSF Protocol

STM32/ESP32/ESP8285-based High-Performance Radio Link for RC applications - ExpressLRS/ExpressLRS

lucid thorn Apr 12, 2023, 7:23 PM

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yea id seen that was recently merged. I saw that its available in a dropdown menu in the src/html/index.html page but I couldn't figure out how to get that option visible in configurator

queen schooner Apr 12, 2023, 7:23 PM

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Options are moving away from configurator as we are trying to get away from compile-time options.

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You can select the RX protocol from the Lua script as well

#Can the ELRS airport feature do SBUS passthrough as illustrated?