stm32f3xx-hal
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Handle stm32f303x6/8 which does not have USB?
Reference Manual for the clock tree, where no USB clock appears.
https://github.com/stm32-rs/stm32f3xx-hal/blob/14ed7e55ed8f83f09a54d08fc81d7575d6404403/src/rcc.rs#L100-L101
Also, the feature usb ram feature in Cargo.toml do not get used in usb.rs.