pub trait SpiBus<Word: Copy = u8>: SpiBusRead<Word> + SpiBusWrite<Word> {
fn transfer(
&mut self,
read: &mut [Word],
write: &[Word]
) -> Result<(), Self::Error>;
fn transfer_in_place(
&mut self,
words: &mut [Word]
) -> Result<(), Self::Error>;
}Expand description
Read-write SPI bus
SpiBus represents exclusive ownership over the whole SPI bus, with SCK, MOSI and MISO pins.
See the module-level documentation for important information on SPI Bus vs Device traits.
Required Methods
Write and read simultaneously. write is written to the slave on MOSI and
words received on MISO are stored in read.
It is allowed for read and write to have different lengths, even zero length.
The transfer runs for max(read.len(), write.len()) words. If read is shorter,
incoming words after read has been filled will be discarded. If write is shorter,
the value of words sent in MOSI after all write has been sent is implementation-defined,
typically 0x00, 0xFF, or configurable.
Implementations are allowed to return before the operation is complete. See the module-level documentation for details.
fn transfer_in_place(&mut self, words: &mut [Word]) -> Result<(), Self::Error>
fn transfer_in_place(&mut self, words: &mut [Word]) -> Result<(), Self::Error>
Write and read simultaneously. The contents of words are
written to the slave, and the received words are stored into the same
words buffer, overwriting it.
Implementations are allowed to return before the operation is complete. See the module-level documentation for details.