Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F407/SAI1/SAI_BSLOTR#0x0
SAI BSlot register
First bit offset
Slot size
Number of slots in an audio frame
Slot enable
https://github.com/cmsis-svd/cmsis-svd-data