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Document implicit assumption in non-blocking spi trait #120

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8 changes: 7 additions & 1 deletion src/spi.rs
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,13 @@ use nb;
///
/// - It's the task of the user of this interface to manage the slave select lines
///
/// - Due to how full duplex SPI works each `read` call must be preceded by a `send` call.
/// - Due to how full duplex SPI works each `try_read` call must be preceded by a `try_send` call.
///
/// - `try_read` calls only return the data received with the last `try_send` call.
/// Previously received data is discarded
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///
/// - Data is only guaranteed to be clocked out when the `try_read` call succeeds.
/// The slave select line shouldn't be released before that.
///
/// - Some SPIs can work with 8-bit *and* 16-bit words. You can overload this trait with different
/// `Word` types to allow operation in both modes.
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