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use crate::*;
/// Provides access to the SPI.
///
/// See: [`Spi::read()`] and [`Spi::write()`].
pub struct Spi<'a> {
sim: &'a mut AvrSimulator,
id: u8,
}
impl<'a> Spi<'a> {
pub(crate) fn new(sim: &'a mut AvrSimulator, id: u8) -> Self {
Self { sim, id }
}
/// Retrieves a value from AVR.
///
/// See: [`Readable`].
/// See also: [`Self::try_read_byte()`].
///
/// # Examples
///
/// ```no_run
/// # use avr_tester::*;
/// # fn avr() -> AvrTester { panic!() }
/// #
/// let mut avr = avr();
///
/// // Retrieves a single byte:
/// // (when the input buffer is empty, panics.)
/// assert_eq!(72, avr.spi0().read::<u8>());
///
/// // Retrieves the entire buffer:
/// // (when it's empty, returns an empty vector.)
/// assert_eq!(vec![72, 101, 108, 108, 111], avr.spi0().read::<Vec<u8>>());
///
/// // Retrieves `n` bytes from the buffer:
/// // (when there's not enough bytes, panics.)
/// assert_eq!([72, 101, 108, 108, 111], avr.spi0().read::<[u8; 5]>());
///
/// // Retrieves the entire input buffer and converts it into string:
/// // (when it's empty, returns an empty string.)
/// assert_eq!("Hello", avr.spi0().read::<String>());
/// ```
pub fn read<T>(&mut self) -> T
where
T: Readable,
{
T::read(self)
}
/// Transmits a value to AVR.
///
/// See: [`Writable`].
///
/// # Examples
///
/// ```no_run
/// # use avr_tester::*;
/// # fn avr() -> AvrTester { panic!() }
/// #
/// let mut avr = avr();
///
/// // Transmits a single byte:
/// avr.spi0().write(123);
///
/// // Transmits many bytes:
/// avr.spi0().write([10, 20, 30]);
///
/// // Transmits a string:
/// avr.spi0().write("Hello!");
///
/// // Strings are transmitted as a series of their bytes, so the above is
/// // equivalent to:
/// avr.spi0().write([72, 101, 108, 108, 111, 33]);
/// // H e l l o !
/// ```
pub fn write<T>(&mut self, value: T)
where
T: Writable,
{
value.write(self);
}
}
impl Reader for Spi<'_> {
fn read_byte(&mut self) -> u8 {
self.try_read_byte().expect(
"SPI's buffer is empty - got no more bytes to read; if you're \
receiving a large buffer, try running the simulator for a bit \
longer so that the simulated AVR has more time to respond",
)
}
fn try_read_byte(&mut self) -> Option<u8> {
self.sim.read_spi(self.id)
}
}
impl Writer for Spi<'_> {
fn write_byte(&mut self, value: u8) {
self.sim.write_spi(self.id, value);
}
}
/// Asynchronous equivalent of [`Spi`].
///
/// See [`avr_rt()`] for more details.
pub struct SpiAsync {
id: u8,
}
impl SpiAsync {
pub(crate) fn new(id: u8) -> Self {
Self { id }
}
/// Asynchronous equivalent of [`Spi::read()`].
pub fn read<T>(&self) -> T
where
T: Readable,
{
self.with(|spi| spi.read())
}
/// Asynchronous equivalent of [`Spi::write()`].
pub fn write<T>(&mut self, value: T)
where
T: Writable,
{
self.with(|spi| spi.write(value))
}
fn with<T>(&self, f: impl FnOnce(&mut Spi) -> T) -> T {
ComponentRuntime::with(|rt| {
let mut spi = Spi::new(rt.sim(), self.id);
f(&mut spi)
})
}
}
impl Reader for SpiAsync {
fn read_byte(&mut self) -> u8 {
self.with(|spi| spi.read_byte())
}
fn try_read_byte(&mut self) -> Option<u8> {
self.with(|spi| spi.try_read_byte())
}
}
impl Writer for SpiAsync {
fn write_byte(&mut self, value: u8) {
self.with(|spi| spi.write_byte(value))
}
}