Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f3/STM32F302/ADC1/SMPR2#0x0
sample time register 2
SMP10
SMP11
SMP12
SMP13
SMP14
SMP15
SMP16
SMP17
SMP18
https://github.com/modm-io/cmsis-svd-stm32