I trying to setup my OmniBus F4 Pro AIO V3, with a FMS FJ40, AKK F4 Flight Controller with Integrated OSD support SD Card. I have a GPS with compass a Rx and OSD on a gimbal mounted HD camera. So i need a third UART ports for the OSD telem.
Here is the config page
UART 1 = Rx works
UART 6 = GPS works
I2C = Compass works
On the config page it has this;
The RSSI pad can be re-purposed to be the TX output of UART4 instead of analog RSSI input, if the BRD_ALT_CONFIG param is set to 2 or 3. And if BRD_ALT_CONFIG param is set to 3, then PWM output pin 5 becomes instead, the RX pin of UART4 to provide a full addition UART. Also, if BRD_ALT_CONFIG param is set to 4, then both UART3 and UART4 are active and available.
see this too.
But this doesn’t seem to work?! No ‘UART 4’ appears with BRD_ALT_CONFIG = 3 ? What am I doing wrong?
Thanx