Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32F3x8/SDADC1/CONF2R#0x0
configuration 2 register
Twelve-bit calibration offset for configuration 2
Gain setting for configuration 2
Single-ended mode for configuration 2
Common mode for configuration 2
https://github.com/cmsis-svd/cmsis-svd-data