Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f4/STM32F413/FMPI2C/TIMINGR#0x0
Timing register
SCLL
SCLH
SDADEL
SCLDEL
PRESC
https://github.com/modm-io/cmsis-svd-stm32