Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f4/STM32F412/I2C4/OAR1#0x0
Own address register 1
OA1
OA11_7
OA18_9
OA1MODE
OA1EN
https://github.com/modm-io/cmsis-svd-stm32