Adding Extra UART to Omnibus F4 Pro by editing hwdef file to repurpose RSSI and PWM5

ArduPlane
1

Following this RCGroups post I am trying to add an extra UART to my installed Omnibus F4 Pro V3.
https://www.rcgroups.com/forums/showpost.php?p=39970238&postcount=274

RSSI and PWM5 can be repurposed by editing the hwdef file it seems.

These are the instruction the RCGroups poster offered:

In hwdef.dat add UART4
UART_ORDER OTG1 USART6 UART4 USART1
PA0 UART4_TX UART4
PA1 UART4_RX UART4
Finally remove the RSSI (ADC) and PWM5 definitions.

This looks nothing like the hwdef file I can find in my target folder. This file is a .h file while the poster makes reference to a .dat file. Am I looking in the correct place? Can anyone give me pointers?

2

This is the file you want

3

Many thanks Pete for that link. Should have known to look in Chibios HAL directory.

4

Hi, I know it’s been a long time since your question but could you tell me if it’s necessary to change the software code inorder to enable uart 4 or you can also do it with just putting BRD_ALT_CONFIG to 3 and nothing else at all in mission planner ?

5

Varies with targets. But to use the rssi pad as a uart tx or rx on this board I think you may need to edit the hwdef.dat file and recompile.

6

Ok so does it work well enough on your board after doing the code change or did you do both the code change as well as BRD_ALT_CONFIG parameter to some operable value inorder to get uart 4 to work out ?

And another thing, the reason I did not want to do the software code change is because I’m severely inexperienced with insides of mission planner so could you give me a heads up on how exactly you changed the hwdef.dat files and recompiled the software? please try to be as basic as possible while also not leaving any important info out.