/
spi.rs
127 lines (106 loc) · 3.31 KB
/
spi.rs
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//! Blocking SPI API
/// Blocking transfer
pub trait Transfer<W> {
/// Error type
type Error;
/// Sends `words` to the slave. Returns the `words` received from the slave
fn transfer<'w>(&mut self, words: &'w mut [W]) -> Result<&'w [W], Self::Error>;
}
/// Blocking write
pub trait Write<W> {
/// Error type
type Error;
/// Sends `words` to the slave, ignoring all the incoming words
fn write(&mut self, words: &[W]) -> Result<(), Self::Error>;
}
/// Blocking write (iterator version)
#[cfg(feature = "unproven")]
pub trait WriteIter<W> {
/// Error type
type Error;
/// Sends `words` to the slave, ignoring all the incoming words
fn write_iter<WI>(&mut self, words: WI) -> Result<(), Self::Error>
where
WI: IntoIterator<Item = W>;
}
/// Blocking transfer
pub mod transfer {
/// Default implementation of `blocking::spi::Transfer<W>` for implementers of
/// `spi::FullDuplex<W>`
pub trait Default<W>: ::spi::FullDuplex<W> {}
impl<W, S> ::blocking::spi::Transfer<W> for S
where
S: Default<W>,
W: Clone,
{
type Error = S::Error;
fn transfer<'w>(&mut self, words: &'w mut [W]) -> Result<&'w [W], S::Error> {
for word in words.iter_mut() {
block!(self.send(word.clone()))?;
*word = block!(self.read())?;
}
Ok(words)
}
}
}
/// Blocking write
pub mod write {
/// Default implementation of `blocking::spi::Write<W>` for implementers of `spi::FullDuplex<W>`
pub trait Default<W>: ::spi::FullDuplex<W> {}
impl<W, S> ::blocking::spi::Write<W> for S
where
S: Default<W>,
W: Clone,
{
type Error = S::Error;
fn write(&mut self, words: &[W]) -> Result<(), S::Error> {
for word in words {
block!(self.send(word.clone()))?;
block!(self.read())?;
}
Ok(())
}
}
}
/// Blocking write (iterator version)
#[cfg(feature = "unproven")]
pub mod write_iter {
/// Default implementation of `blocking::spi::WriteIter<W>` for implementers of
/// `spi::FullDuplex<W>`
pub trait Default<W>: ::spi::FullDuplex<W> {}
impl<W, S> ::blocking::spi::WriteIter<W> for S
where
S: Default<W>,
W: Clone,
{
type Error = S::Error;
fn write_iter<WI>(&mut self, words: WI) -> Result<(), S::Error>
where
WI: IntoIterator<Item = W>,
{
for word in words.into_iter() {
block!(self.send(word.clone()))?;
block!(self.read())?;
}
Ok(())
}
}
}
/// Operation for transactional SPI trait
///
/// This allows composition of SPI operations into a single bus transaction
#[derive(Debug, PartialEq)]
pub enum Operation<'a, W: 'static> {
/// Write data from the provided buffer, discarding read data
Write(&'a [W]),
/// Write data out while reading data into the provided buffer
Transfer(&'a mut [W]),
}
/// Transactional trait allows multiple actions to be executed
/// as part of a single SPI transaction
pub trait Transactional<W: 'static> {
/// Associated error type
type Error;
/// Execute the provided transactions
fn exec<'a>(&mut self, operations: &mut [Operation<'a, W>]) -> Result<(), Self::Error>;
}