Posts: 21,345 Threads: 591 Likes Received: 9,009 in 6,669 posts Likes Given: 1,428 Joined: Jun 2018 Reputation: 792 12-Apr-2023, 12:37 AM (This post was last modified: 12-Apr-2023, 12:38 AM by SnowLeopardFPV. Edit Reason: Amended title. ) Posts: 4,073 Threads: 75 Likes Received: 2,549 in 1,858 posts Likes Given: 3,949 Joined: May 2021 Reputation: 121 12-Apr-2023, 01:12 AM (This post was last modified: 12-Apr-2023, 01:13 AM by Lemonyleprosy.) …and I’m sure in 6 months they’ll come out with a “new” version of fbus receivers that run a new firmware version that isn’t backwards compatible with the first version of rx’s that they release that run fbus. Or those fbus receivers will require some special new non backwards compatible tx to rx protocol. Or… hell, I can’t even keep my hypothetical straight, much less their actual protocols.  …does this mean they already gave up on their ELRS fork? Dangerous operations.
Disclaimer: I don’t know wtf I’m talking about.
I wish I could get the smell of burnt electronics out of my nose. Posts: 21,345 Threads: 591 Likes Received: 9,009 in 6,669 posts Likes Given: 1,428 Joined: Jun 2018 Reputation: 792 Pawel also mentioned an "F.Port 2" protocol in his video. I didn't even know that was a thing until I heard it today  And just when you thought the FrSky mess couldn't get any worse. I don't think they have given up on their own forked / butchered version of ExpressLRS which is in breach of the GPL licensing because they haven't made the source code for it publicly available anywhere. They are currently offering it on some of their new transmitters as an ELRS "compatible" protocol which has ZERO support from the ExpressLRS developers. The mind boggles. Someone forgot to send FrSky technicians the memo that when already in a hole that is well above your head, stop digging  Posts: 1,489 Threads: 92 Likes Received: 574 in 468 posts Likes Given: 0 Joined: Nov 2020 Reputation: 27 AFAIK https://github.com/betaflight/betaflight/issues/12398 CRSF looks like diff baud rate for ELRS.. weird 400k baud IBUS 115.2k baud. 8N2 2 byte header, 28 byte for 14ch frame, 2byte CRC. SBUS 100k baud 8N1 1 byte header, 16ch 11bit each. etc, byte25 footer https://github.com/bolderflight/sbus/blo.../README.md there is also 200k baud fast sbus FPort 115.2k baud 8N1 I guess FPort2 is 250k baud?? ![[-]](https://intofpv.com/images/collapse.png) • Posts: 2,389 Threads: 119 Likes Received: 827 in 672 posts Likes Given: 131 Joined: Feb 2021 Reputation: 20 Another good reason to feel good on leaving Frsky.. I just wish I could replace the internal protocol of my taranis opposed to using an external modules. • Posts: 21,345 Threads: 591 Likes Received: 9,009 in 6,669 posts Likes Given: 1,428 Joined: Jun 2018 Reputation: 792 (12-Apr-2023, 11:11 AM)Rob Axel Wrote: I just wish I could replace the internal protocol of my taranis opposed to using an external modules. I would actually rather have a "dumb" transmitter with NO built-in internal module which ends up being tied to the transmitter. Modular systems are the future where you can just swap, change, and upgrade as you see fit without built-in internal hardware then becoming redundant. Even with Crossfire the Tango 2 had to have a complete new mainboard (twice) when TBS upgraded the transmitting components on it. I've also seen ExpressLRS modules which have been improved with better versions. Having any transmitting hardware as external modules makes it much easier to just "throw away" an out-of-date module and slot in a newer or better one without any fuss. Posts: 1,507 Threads: 49 Likes Received: 714 in 525 posts Likes Given: 478 Joined: Oct 2020 Reputation: 93 (12-Apr-2023, 10:38 AM)romangpro Wrote: SBUS 100k baud 8N1
1 byte header, 16ch 11bit each. etc, byte25 footer
https://github.com/bolderflight/sbus/blo.../README.md Even more bizarrely, SBUS is actually 100k baud 8 E2, and inverted. • Posts: 6,114 Threads: 172 Likes Received: 2,288 in 1,835 posts Likes Given: 4,737 Joined: Feb 2019 Reputation: 101 12-Apr-2023, 11:30 PM (This post was last modified: 12-Apr-2023, 11:31 PM by hugnosed_bat.) what is frsky? xD Posts: 1,489 Threads: 92 Likes Received: 574 in 468 posts Likes Given: 0 Joined: Nov 2020 Reputation: 27 IBUS 10bits/byte. 28byte frame. 411 /s
SBUS 11bits/byte. 25byte frame. 363 /s.
What is the frame and serial flow for CRSF.. anybody know? • Posts: 2,389 Threads: 119 Likes Received: 827 in 672 posts Likes Given: 131 Joined: Feb 2021 Reputation: 20 (12-Apr-2023, 11:30 PM)hugnosed_bat Wrote: what is frsky? xD As funny as this is.. when I first got into the hobby I thought Frsky and Flysky were the same thing.. chalked it up to “auto correct”.. Had no idea what a “radio protocol” was.. Posts: 6,114 Threads: 172 Likes Received: 2,288 in 1,835 posts Likes Given: 4,737 Joined: Feb 2019 Reputation: 101 (13-Apr-2023, 10:11 AM)romangpro Wrote: IBUS 10bits/byte. 28byte frame. 411 /s
SBUS 11bits/byte. 25byte frame. 363 /s.
What is the frame and serial flow for CRSF.. anybody know? https://oscarliang.com/improve-radio-control-latency/ crsfshot locka the frame rate on 150hz to 6.7ms, does this relate in anyway to the values of sbus and ibua above? i couldnt find better infos so far  • Posts: 1,489 Threads: 92 Likes Received: 574 in 468 posts Likes Given: 0 Joined: Nov 2020 Reputation: 27 No. not related.
The radio processes a command and sends a signal. It has specific frequency and amplitude and phase modulation... this is the "air" protocol. Its 150Hz for Crossfire.
The way they encode the data and send it.. this is what the bandwidth allows.
ELRS very cleverly packs the bits for channels and telemetry together.. not wasting "space". Thats why 500hz is possible.
CRSF is the rx protocol between receiver and flight controller. Thats what my post was about. • Posts: 963 Threads: 72 Likes Received: 341 in 255 posts Likes Given: 157 Joined: Dec 2021 Reputation: 19 Light years ago in another Galaxy far far away I was a Beta Tester for the FrSky X12S. I'd already got a batch 2 Taranis.
Considering FrSky got going by offering greatly cheaper and unapproved Futaba FASST compatible receivers, they pretty soon went poacher turned gamekeeper and the "fun" began on their formats.
Lost the Plot is an understatement on where they are now, but look around the fixed wing forums and you'll find lots of die hard fans who are looking forward to the next greatest protocol change!
Ignoring the non-FrSky Tx's I own (lots) my Taranis has a Futaba FASST module (very rare), and my three X12S are as follows:-
1. OpenTX, iRange Multiprotocol.
2. OpenTX, Namimno ELRS 2.4 v2
3 EdgeTX, Namimno ELRS 2.4 v3 • |
