RC Input Spektrum SRXL .. available serial port?

[andrewvmessier (Andrew Messier)]

Hello, according to the ardupilot documentation The Spektrum SRXL protocol is supported through a direct UART connection:

https://ardupilot.org/copter/docs/common-rc-systems.html#common-rc-systems

I understand the default Navio RCIN only accepts PPM (which Spektrum stopped supporting) … but my questions is: is there a way to directly connect to an available raspberry PI serial port and use it for the RCIN function?

This link indicates a potentially spare UART on IO17 / IO18 …

Pinout | Navio2

… but I frankly have no idea how that would map to a serial port recognizable by ardupilot / mission planner. I guess in general I’m a little fuzzy on mappings from the NAVIO board to the arduino to ardupilot to mission planner.

Thanks!

[liudmila.slepova]

Hi Andrew,

Welcome to our forum!

Navio2 only supports PPM and SBUS inputs. Indeed, it doesn’t work with the SRXL protocol. The thing is, even if you connect the device to Navio2 and Raspberry Pi, it still needs additional code development to make it work.

However, as a workaround, you may check if there are Spektrum compatible receivers with SBUS output. You can take a look at the example of it from the older thread:

Newbie needing advice - Navio2 on RPI3 with dual Static IP Verizon Jetpacks

Congrats on quick results! Navio2 only supports PPM and SBUS inputs, it does not support SRXL. As a workaround you can use Spektrum-compatible receiver that is able to output SBUS. Seems like OrangeRx R800X is suitable for that purpose. Pixhawk wiki says that it is able to output 14 channels over SBUS.