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use core::convert::Infallible;
use embedded_hal::{
blocking::spi::{Operation, Transactional, Transfer, Write, WriteIter},
spi::FullDuplex,
};
use crate::spi::SpiConfig;
use super::{Pins, SpiBus, SpiX};
pub struct SpiExclusiveDevice<SPI, PINS> {
bus: SpiBus<SPI, PINS>,
}
impl<SPI, PINS> SpiExclusiveDevice<SPI, PINS>
where
SPI: SpiX,
PINS: Pins<SPI>,
{
pub fn new(mut bus: SpiBus<SPI, PINS>, config: &SpiConfig) -> Self
where
PINS: Pins<SPI>,
{
bus.configure(config, PINS::CS_INDEX);
Self { bus }
}
pub fn release(self) -> (SPI, PINS) {
self.bus.release()
}
}
impl<SPI, PINS> FullDuplex<u8> for SpiExclusiveDevice<SPI, PINS>
where
SPI: SpiX,
PINS: Pins<SPI>,
{
type Error = Infallible;
fn read(&mut self) -> nb::Result<u8, Infallible> {
self.bus.read()
}
fn send(&mut self, byte: u8) -> nb::Result<(), Infallible> {
self.bus.send(byte)
}
}
impl<SPI, PINS> Transfer<u8> for SpiExclusiveDevice<SPI, PINS>
where
SPI: SpiX,
PINS: Pins<SPI>,
{
type Error = Infallible;
fn transfer<'w>(&mut self, words: &'w mut [u8]) -> Result<&'w [u8], Self::Error> {
self.bus.start_frame();
let result = self.bus.transfer(words);
self.bus.end_frame();
result
}
}
impl<SPI, PINS> Write<u8> for SpiExclusiveDevice<SPI, PINS>
where
SPI: SpiX,
PINS: Pins<SPI>,
{
type Error = Infallible;
fn write(&mut self, words: &[u8]) -> Result<(), Self::Error> {
self.bus.start_frame();
let result = self.bus.write(words);
self.bus.end_frame();
result
}
}
impl<SPI, PINS> WriteIter<u8> for SpiExclusiveDevice<SPI, PINS>
where
SPI: SpiX,
PINS: Pins<SPI>,
{
type Error = Infallible;
fn write_iter<WI>(&mut self, words: WI) -> Result<(), Self::Error>
where
WI: IntoIterator<Item = u8>,
{
self.bus.start_frame();
let result = self.bus.write_iter(words);
self.bus.end_frame();
result
}
}
impl<SPI, PINS> Transactional<u8> for SpiExclusiveDevice<SPI, PINS>
where
SPI: SpiX,
PINS: Pins<SPI>,
{
type Error = Infallible;
fn exec<'op>(&mut self, operations: &mut [Operation<'op, u8>]) -> Result<(), Infallible> {
self.bus.start_frame();
let result = self.bus.exec(operations);
self.bus.end_frame();
result
}
}