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//! Blocking hardware random number generator /// Blocking read /// /// *This trait is available if embedded-hal is built with the `"unproven"` feature.* #[cfg(feature = "unproven")] pub trait Read { /// Error type type Error; /// Reads enough bytes from hardware random number generator to fill `buffer` /// /// If any error is encountered then this function immediately returns. The contents of buf are /// unspecified in this case. /// /// If this function returns an error, it is unspecified how many bytes it has read, but it /// will never read more than would be necessary to completely fill the buffer. fn read(&mut self, buffer: &mut [u8]) -> Result<(), Self::Error>; }