Hi Martin,
here’s the official Matek docs, scroll to the bottom for frsky help.
you basically have 2 options:
- You can use the usual converter/inverter cable on any serial port
- if you have a receiver that somehow exposes an uninverted sport/fport pad you can try with Matek’s settings (the use SERIAL_OPTIONS=7 which doesn’t make sense for F4 do not support builtin inversion so the correct option is SERIAL_OPTION 4)
sport
- TX4 pad
- SERIAL2_BAUD 57
- SERIAL2_OPTIONS 4 (enable halfduplex)
- SERIAL2_PROTOCOL 10
fport (requires latest master)
- TX4 pad
- SERIAL2_BAUD 115
- SERIAL2_OPTIONS 4 (enable halfduplex)
- SERIAL2_PROTOCOL 23
best receiver with the uninverted sport/fport pad out of the box is the r-xsr which is great for mini/micro stuff
cheers,
Alex
Edit: corrected serial_option for sport, should be 10 to use my scripts