I have to say when this one eventually gets damaged I don’t think I will ever own another one again either! Has been the longest set up ever, not flown anything for over a week, spending all my time trying to unlock this one.

(30-Sep-2021, 01:32 PM)SnowLeopardFPV Wrote: One thing that isn't clear with some of these F7 FC's that have a pad specifically marked for S.Port/F.Port is whether or not that pad has an inline hardware inverter between it and the MCU pin. All F7 MCUs natively support signal inversion without the need for an inline inverter so if manufacturers are putting dedicated S.Port/F.Port pads on their F7 FC's which has an inline hardware inverter like they needed to for F4 MCUs then they are just confusing things, and if the inverter isn't bi-directional then it will only allow data to flow one way meaning the MCU will only get either RC command data from the transmitter or telemetry data back, but not both. So maybe this is the issue on some of these F7 FC's. I wonder if these manufacturers ever actually tested the use of F.Port on their F7 FC's which have a dedicated S.Port/F.Port pad.

The easy option is to just try using the TX pad of a different UART instead, but it would be nice to find out if Diatone are using an inline inverter on their F7 FC's or not. You can test the theory by using a multimeter in continuity mode to see if the S.Port/F.Port pad has a direct connection to the PB6 pin on the MCU (pin #58 in the pinout diagram below). If it doesn't then it means that there is a hardware inverter somewhere between the pad and the MCU pin.

Right so the change to TX4 worked perfectly thanks!! your a star

Not happy with that though so I stayed up last night taking the whole thing apart to see if they had installed an inline inverter only to find that they had bonded a bloody mamba systems plate to the top of the chip, tried to get it off but was at the point where something was going to break. Solder a pin to my meter probe to try and get into it but couldn't find any continuity between TX1 an the pins in the region of #58 in either direction, though to be honest it was so fiddly it was a bit a stab in the dark.

Any how between Diatone and Frsky they royally screwed this one up. I think I might transition away from frisky next year, but I just love my X-Lite's as they are so portable and easy for me to travel around with I'm not driving to a location (even though they are not the most pleasant to use). 

anyhow, legend thanks, saved me a lot of time fault finding and changing TX pad would have been the last thing I would have thought of on a new FC.

The Diatone FC's have been a solid budget price FC (at least the F4 versions of the same), but I think it is probably an idea to stay away from the F7 versions because of some anomalies that Diatone appear to have introduced into them. There also seems to be some kind of issue with the MSP data connection on their F7 FC's (used for the DJI FPV System and also Shark Byte HDZero VTXs) whereby it only works on either UART3 or UART4 (I forget which of the two now), but not on any other UART which is really odd.

As for RC link hardware, I left FrSky receivers behind 2 years ago and I haven't looked back. I now use TBS Crossfire on my quads which "just works" and I never have to worry about having a failsafe (knock on wood). You can get a Crossfire Nano TX for the FrSky X-Lite transmitter which just slots into the "Lite" bay in the back of the X-Lite. Alternatively if you like experimenting with open source hardware / software then there are now also offerings for 2.4GHz ExpressLRS which are available in "Lite" bay format so will also fit the X-Lite. Both of those systems are way better and more reliable than using an FrSky RC link.

(01-Oct-2021, 12:18 PM)SnowLeopardFPV Wrote: The Diatone FC's have been a solid budget price FC (at least the F4 versions of the same), but I think it is probably an idea to stay away from the F7 versions because of some anomalies that Diatone appear to have introduced into them. There also seems to be some kind of issue with the MSP data connection on their F7 FC's (used for the DJI FPV System and also Shark Byte HDZero VTXs) whereby it only works on either UART3 or UART4 (I forget which of the two now), but not on any other UART which is really odd.

As for RC link hardware, I left FrSky receivers behind 2 years ago and I haven't looked back. I now use TBS Crossfire on my quads which "just works" and I never have to worry about having a failsafe (knock on wood). You can get a Crossfire Nano TX for the FrSky X-Lite transmitter which just slots into the "Lite" bay in the back of the X-Lite. Alternatively if you like experimenting with open source hardware / software then there are now also offerings for 2.4GHz ExpressLRS which are available in "Lite" bay format so will also fit the X-Lite. Both of those systems are way better and more reliable than using an FrSky RC link.

funny enough I was reading into expressLRS at the weekend as an option to migrate away from. The whole thing was triggered by my next project being probably a 7" Long Range Quad for my trip to Switzerland next year to the Eiger