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Make BlockDevice depend on Write<u8> to remove mutable reference on write buffer #30
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Hi!
I ran into the issue of write_bytes taking a &mut [u8], because the Transfer trait requires it.
The nRF52-hal SPI drivers appear to implement Write<_> at least, so I made the BlockDevice trait depend on that so write_bytes can be non-mutable.
This required some reorganisation of the Error type to receive the SPI Error type, as both Transfer and Write have their own associated Error type.
I might've missed some implications of depending on the Write trait, as I assumed that anything that implements Transfer, should have no problem implementing Write.