Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG13P/EFR32FG13P231F512GM48/ETM/ETMTRIGGER#0x0
ETM Trigger Event Register
ETM Resource A
ETM Resource B
ETM Function
https://github.com/cmsis-svd/cmsis-svd-data