Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F412/I2C4/TIMINGR#0x0
Timing register
SCLL
SCLH
SDADEL
SCLDEL
PRESC
https://github.com/cmsis-svd/cmsis-svd-data