Hi, I would like to know if it was possible to connect a dji fpv or gps to the sbus and ppm pins (tx1 and rx1) of the mamba f405 mk2.

 if yes, what should be changed in the cli ?

 Currently I plugged my crossfire on sbus and ppm, my radio works under betaflight but I do not receive telemetry.


 Thanks for your help.

The problem with the SBUS (RX1) pad on FC's is that it has an inverter on that connection so it can't take a normal uninverted signal, which means it can't generally be used for anything other than an FrSky receiver (or 3rd party receiver that uses the FrSky protocols).

However, the FURYF4OSD Betaflight target that the Mamba F405 MK2 uses has a programmable inverter resource on UART1 which is mapped to pin "C00", so you can disable this by running the following commands...


After doing this you should then be able to use the SBUS pad (UART1 RX) for a non-inverted signal (i.e. any normal peripheral other than an FrSky receiver).

(08-Mar-2020, 12:58 PM)SnowLeopardFPV Wrote: The problem with the SBUS (RX1) pad on FC's is that it has an inverter on that connection so it can't take a normal uninverted signal, which means it can't generally be used for anything other than an FrSky receiver (or 3rd party receiver that uses the FrSky protocols).

However, the FURYF4OSD Betaflight target that the Mamba F405 MK2 uses has a programmable inverter resource on UART1 which is mapped to pin "C00", so you can disable this by running the following commands...

Code:

resource INVERTER 1 NONE
save

After doing this you should then be able to use the SBUS pad (UART1 RX) for a non-inverted signal (i.e. any normal peripheral other than an FrSky receiver).Thank you for


Thank you for helping me, it's really nice.

Currently I am in crossfire, I imagine that it is tx1 which sends the information to my radio ??? when I move the stick on betaflight it works, I also have the lq on betaflight but I do not receive information like the current sensor or gps on my radio. How can I make the PPM become tx1?  

For you  it is possible to do that or not?

I am watching another FC in case it is impossible. I would like it to be Inav compatible too because I know inav and I like. what do you think of the iflight succex twing 722 with ESC 50 or 60amp? it works well ? is it reliable?

Thanks

Have you set up your Crossfire Nano RX to use the SBUS protocol rather than the CRSF protocol by any chance? That is the only way I believe the Nano RX will work when connected to an SBUS pad. The downside to using the SBUS protocol on the Crossfire kit however is that the only telemetry you will get back to the transmitter is RSSI/LQ telemetry data because that is sent back directly from the Crossfire Nano RX so RSS/LQ telemetry data doesn't require a connection to the FC.

I also forgot that on the Mamba F405 MK2 stack that while the TX1 resource is mapped to an MCU pin, they don't break it out to a pad for some bizarre reason, so you can only use the RX connection (SBUS pad) for UART1 unless you want to try the risky task of soldering to a minuscule pin on the MCU itself. You also can't remap a hardware resource to another pad, which means you can't remap the TX connection for UART1 to the PPM pad.

Thank you for your help, I ordered an FC kakute HDV to no longer have a problem. I'm going to modify the pins.