https://github.com/stm32-rs/stm32f4xx-hal/blob/578921a1dbfae4231924fc912138c861fca20253/src/adc.rs#L1187 This should be 16. And I find some others are 18, same with Vbat. https://github.com/stm32-rs/stm32f4xx-hal/blob/578921a1dbfae4231924fc912138c861fca20253/src/adc.rs#L1217 https://github.com/stm32-rs/stm32f4xx-hal/blob/578921a1dbfae4231924fc912138c861fca20253/src/adc.rs#L1307
