Omnibus F4 V3 - Can't enable softserial

[DangerD256]

Softserial is enabled in configuration tab (also checked in cli) but port doesn't appears in ports tab

[shellixyz]

That's because no software serial pins are configured for the OMNIBUS F4 V3 FC.

[DangerD256]

Any way to change this? If I flash pro firmware they will work...

[shellixyz]

No it probably won't work because on the V3 board one of the pins used for softserial on the PRO is used for switching the UART6 inverter. Free usable pins would need to be found to assign to the softserial port for the V3.

[DangerD256]

PWM5 and 6. If I will flash firmware from omnibus f4 pro to my v3 it works.

[shellixyz]

Odd. I don't understand how it could as PC8/PC9 used for softserial on the PRO doesn't seem to be connected to the PWM 5 and 6 outputs. Referring to the source code they should be connected to the CH5/CH6 pads on the PRO (CH5/CH6 is not PWM5/6, not the same thing).

[shellixyz]

Also assuming you were talking about CH5/6 if you are using SBUS and the PC8 pin is really used for controlling the UART6 inverter it would cause issues with your RX link.

[KnuckleUpFPV]

My uart6 doesnt work at all. no matter what I do. no rc link, no gps, no smart audio, nothing

[shellixyz]

@KnuckleUpFPV Off topic. This issue is about softserial. Maybe something happened to your UART6 and it is dead. Can't think of anything else. I know it is working for at least SBUS for other people.

Update: In 1.8.0 UART6 is not working with SBUS but the issue has been fixed in dev and it should be working with uninverted signals (GPS). Also are you sure you did not swap RX/TX lines ?

[KnuckleUpFPV]

Soft serial isnt working either. Meant to include that. And no the wires arent swapped. Like I said it works on uart 1 but uart6 will not respond to any input. Sbus, crsf, non inverted sbus. Nothing. Zip zilch nodda. My apologies for being off topic. No one knows why this uart doesnt work. I've been posting anywhere I can get a response. A lot of threads are dead. I'll just throw it out and buy something else. I have 18 other mini quads and 3 wings to fly.

[KnuckleUpFPV]

Disregard. They removed ch5 and ch6. I scraped the board from the two very tiny pads by the sd card. Where the ch5 and ch6 were at on the v2. I soldered to them and gps is now working over soft serial. I hope someone else comes here and finds this

[ekitru]

The problem looks like similar to mine.
I have Matek 405-AIO board and trying to connect frsky S.BUS telemetry throught softserial.
Enabling softserial feature does not help, there is not softserial ports at all.

[KnuckleUpFPV]

I got soft serial working on the matek. Had to use cli to turn it on. The slider doesnt work in inav

[ekitru]

I have tried feature -SOFTSERIAL, save, feature SOFTSERIAL, save
it does not help.
I am newbie in RC and INAV
Can you help me, may be some other feature need to enabled or disabled, or some command is needed to activate s.bus on pin6 ?

[KnuckleUpFPV]

First can I ask why you aren't using the non inverted signal from the receiver? Its alot easier. You can pull the none inverted and hook it to a regular uart. And I use the cli command and moved the soft serial slider both. I had to move slider save and then do the cli command. It would be alot better to pull the non inverted signal. There are lots of pics on Google where to solder too. I'm happy to help you. I can't figure out how to post pics in here. You can find me on Facebook and we can use Facebook messenger. My name is Robert Criteser. There is only two of us on Facebook. Myself and my uncle. The pic is of myself and my girlfriend at a new years party. Message me and I can send you pics.

[shellixyz]

@ekitru S.Bus on UART6 doesn't work in 1.8.0. This is a known bug (see #2642 for an explanation an alpha fix). Also softserial doesn't work with the Omnibus F4 V3 board as no pins has been defined for the RX/TX lines.