Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F3x8/SDADC1/CONF1R#0x0
configuration 1 register
Twelve-bit calibration offset for configuration 1
Gain setting for configuration 1
Single-ended mode for configuration 1
Common mode for configuration 1
https://github.com/cmsis-svd/cmsis-svd-data