humpback-dds/src/spi_slave.rs

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Rust
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use crate::cpld::CPLD;
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use crate::urukul::Error;
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use embedded_hal::{blocking::spi::Transfer, digital::v2::OutputPin};
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pub struct SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>(
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// SPI device to be multiplexed
&'a CPLD<SPI, CS0, CS1, CS2, GPIO>,
// Channel of SPI slave
u8,
// Need I/O Update
bool,
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);
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pub struct Parts<'a, SPI, CS0, CS1, CS2, GPIO> {
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pub spi1: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
pub spi2: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
pub spi3: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
pub spi4: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
pub spi5: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
pub spi6: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
pub spi7: SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>,
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}
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impl<'a, SPI, CS0, CS1, CS2, GPIO> Parts<'a, SPI, CS0, CS1, CS2, GPIO> {
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pub(crate) fn new(cpld: &'a CPLD<SPI, CS0, CS1, CS2, GPIO>) -> Self {
Parts {
spi1: SPISlave(&cpld, 1, false),
spi2: SPISlave(&cpld, 2, false),
spi3: SPISlave(&cpld, 3, false),
spi4: SPISlave(&cpld, 4, true),
spi5: SPISlave(&cpld, 5, true),
spi6: SPISlave(&cpld, 6, true),
spi7: SPISlave(&cpld, 7, true),
}
}
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}
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impl<'a, SPI, CS0, CS1, CS2, GPIO, E> Transfer<u8> for SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>
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where
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CS2: OutputPin,
CS1: OutputPin,
CS0: OutputPin,
SPI: Transfer<u8, Error = E>,
GPIO: OutputPin,
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{
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type Error = Error<E>;
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fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
let mut dev = self
.0
.data
.try_borrow_mut()
.map_err(|_| Error::GetRefMutDataError)?;
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dev.select_chip(self.1).map_err(|_| Error::CSError)?;
let result = dev.spi.transfer(words).map_err(Error::SPI)?;
dev.select_chip(0).map_err(|_| Error::CSError)?;
if self.2 {
dev.issue_io_update().map_err(|_| Error::IOUpdateError)?;
}
Ok(result)
}
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}