Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F7x8/Flash/SR#0x0
Status register
End of operation
Operation error
Write protection error
Programming alignment error
Programming parallelism error
Programming sequence error
Busy
https://github.com/cmsis-svd/cmsis-svd-data