humpback-dds/src/spi_slave.rs

use embedded_hal::{
	blocking::spi::Transfer,
	digital::v2::OutputPin,
};
use core::marker::PhantomData;

use crate::{DoOnGetRefMutData, Error, SelectChip};

pub struct SPISlave<'a, DEV: 'a, SPI, CS0, CS1, CS2> (
	&'a DEV,
	u8,
	PhantomData<(SPI, CS0, CS1, CS2)>,
);

pub struct Parts<'a, DEV: 'a, SPI, CS0, CS1, CS2> {
	pub spi1: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
	pub spi2: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
	pub spi3: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
	pub spi4: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
	pub spi5: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
	pub spi6: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
	pub spi7: SPISlave<'a, DEV, SPI, CS0, CS1, CS2>,
}

impl<'a, DEV, SPI, CS0, CS1, CS2> Parts<'a, DEV, SPI, CS0, CS1, CS2> {
	pub(crate) fn new(cpld: &'a DEV) -> Self {
		Parts {
			spi1: SPISlave(&cpld, 1, PhantomData),
			spi2: SPISlave(&cpld, 2, PhantomData),
			spi3: SPISlave(&cpld, 3, PhantomData),
			spi4: SPISlave(&cpld, 4, PhantomData),
			spi5: SPISlave(&cpld, 5, PhantomData),
			spi6: SPISlave(&cpld, 6, PhantomData),
			spi7: SPISlave(&cpld, 7, PhantomData),
		}
	}
}

impl<'a, DEV, SPI, CS0, CS1, CS2, E> Transfer<u8> for SPISlave<'a, DEV, SPI, CS0, CS1, CS2>
where
	CS2: OutputPin,
	CS1: OutputPin,
	CS0: OutputPin,
	DEV: DoOnGetRefMutData<SPI, CS0, CS1, CS2>,
	SPI: Transfer<u8, Error = E>,
{
	type Error = Error<E>;

	fn transfer<'w>(&mut self, words: &'w mut[u8]) -> Result<&'w [u8], Self::Error> {
		self.0.do_on_get_ref_mut_data(move |mut dev| {
			dev.select_chip(self.1);
			dev.spi.transfer(words).map_err(Error::SPI)
		})	
	}
}