Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32L4x6/SPI1/SR#0x0
status register
Receive buffer not empty
Transmit buffer empty
CRC error flag
Mode fault
Overrun flag
Busy flag
TI frame format error
FIFO reception level
FIFO transmission level
https://github.com/cmsis-svd/cmsis-svd-data