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Thread: No stick movement with R-XSR in BetaFlight

  1. #1

    No stick movement with R-XSR in BetaFlight

    Hi all.
    I am trying to do a very simply task…changing out receivers in my 3 inch build.
    My 3 inch build has a HGLRC f440 and is flashed
    with omnibusF4 3.5 in beta flight.


    Replacing old X4R with r-xsr. & using s-bus not f-port.
    I have new drivers on r-xsr and blue light in on when powered up (s bus not cppm mode).
    Also, I am using the correct s bus out wire from the receiver (not using the s port wire).
    Problem is I don’t see any stick movement in BF? The r-xsr is bound to the taranis and are talking together.


    I’ve tried “set serialrx_inverted = on” in CLI…didn’t work.
    I’m totally confused. I was successful installing another r-xsr in one of my 5 inch builds using a lux F3 board.


    What the heck?????


    Any help would be greatly appreciated.

  2. #2
    Navigator
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    Nov 2016
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    can you post pic of your ports and configuration tabs

  3. #3
    Navigator schugabe's Avatar
    Join Date
    Jan 2012
    Location
    Austria
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    590
    F3 chips have an inverter for the UARTs and s bus needs an inverted signal. The F4 chips don't have a hardware inverted and this is the reason why it's not working. Some F4 Fcs have some pins with an inverter. If this is not the case with your FC you need to reconfigure the port as a soft serial pin.

  4. #4
    Navigator
    Join Date
    Nov 2016
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    126
    sBus pad is clearly marked on the F440 and is inverted. I know, as I have this setup on my Cerb V3 Proto
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