Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f3/STM32F302/ADC1/JSQR#0x0
injected sequence register
JL
JEXTSEL
JEXTEN
JSQ1
JSQ2
JSQ3
JSQ4
https://github.com/modm-io/cmsis-svd-stm32