Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f3/STM32F303/ADC1/CR#0x0
control register
ADEN
ADDIS
ADSTART
JADSTART
ADSTP
JADSTP
ADVREGEN
ADCALDIF
ADCAL
https://github.com/modm-io/cmsis-svd-stm32