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.