humpback-dds/src/spi_slave.rs

62 lines
1.7 KiB
Rust

use embedded_hal::{
blocking::spi::Transfer,
digital::v2::OutputPin,
};
use crate::cpld::CPLD;
use crate::Error;
pub struct SPISlave<'a, SPI, CS0, CS1, CS2, GPIO> (
// SPI device to be multiplexed
&'a CPLD<SPI, CS0, CS1, CS2, GPIO>,
// Channel of SPI slave
u8,
// Need I/O Update
bool,
);
pub struct Parts<'a, SPI, CS0, CS1, CS2, GPIO> {
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>,
}
impl<'a, SPI, CS0, CS1, CS2, GPIO> Parts<'a, SPI, CS0, CS1, CS2, GPIO> {
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, true),
spi4: SPISlave(&cpld, 4, true),
spi5: SPISlave(&cpld, 5, true),
spi6: SPISlave(&cpld, 6, true),
spi7: SPISlave(&cpld, 7, true),
}
}
}
impl<'a, SPI, CS0, CS1, CS2, GPIO, E> Transfer<u8> for SPISlave<'a, SPI, CS0, CS1, CS2, GPIO>
where
CS2: OutputPin,
CS1: OutputPin,
CS0: OutputPin,
SPI: Transfer<u8, Error = E>,
GPIO: OutputPin,
{
type Error = Error<E>;
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)?;
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)
}
}