Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/SPI1/CR1#0x0
control register 1
SPE
MASRX
CSTART
CSUSP
HDDIR
SSI
CRC33_17
RCRCINI
TCRCINI
IOLOCK
https://github.com/modm-io/cmsis-svd-stm32