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//! [`embassy-net`](https://crates.io/crates/embassy-net) driver for WIZnet ethernet chips.
#![no_std]
#![feature(async_fn_in_trait)]
pub mod chip;
mod device;
use embassy_futures::select::{select, Either};
use embassy_net_driver_channel as ch;
use embassy_net_driver_channel::driver::LinkState;
use embassy_time::{Duration, Timer};
use embedded_hal::digital::OutputPin;
use embedded_hal_async::digital::Wait;
use embedded_hal_async::spi::SpiDevice;
use crate::chip::Chip;
use crate::device::WiznetDevice;
const MTU: usize = 1514;
/// Type alias for the embassy-net driver.
pub type Device<'d> = embassy_net_driver_channel::Device<'d, MTU>;
/// Internal state for the embassy-net integration.
pub struct State<const N_RX: usize, const N_TX: usize> {
ch_state: ch::State<MTU, N_RX, N_TX>,
}
impl<const N_RX: usize, const N_TX: usize> State<N_RX, N_TX> {
/// Create a new `State`.
pub const fn new() -> Self {
Self {
ch_state: ch::State::new(),
}
}
}
/// Background runner for the driver.
///
/// You must call `.run()` in a background task for the driver to operate.
pub struct Runner<'d, C: Chip, SPI: SpiDevice, INT: Wait, RST: OutputPin> {
mac: WiznetDevice<C, SPI>,
ch: ch::Runner<'d, MTU>,
int: INT,
_reset: RST,
}
/// You must call this in a background task for the driver to operate.
impl<'d, C: Chip, SPI: SpiDevice, INT: Wait, RST: OutputPin> Runner<'d, C, SPI, INT, RST> {
pub async fn run(mut self) -> ! {
let (state_chan, mut rx_chan, mut tx_chan) = self.ch.split();
loop {
if self.mac.is_link_up().await {
state_chan.set_link_state(LinkState::Up);
loop {
match select(
async {
self.int.wait_for_low().await.ok();
rx_chan.rx_buf().await
},
tx_chan.tx_buf(),
)
.await
{
Either::First(p) => {
if let Ok(n) = self.mac.read_frame(p).await {
rx_chan.rx_done(n);
}
}
Either::Second(p) => {
self.mac.write_frame(p).await.ok();
tx_chan.tx_done();
}
}
}
} else {
state_chan.set_link_state(LinkState::Down);
}
}
}
}
/// Create a Wiznet ethernet chip driver for [`embassy-net`](https://crates.io/crates/embassy-net).
///
/// This returns two structs:
/// - a `Device` that you must pass to the `embassy-net` stack.
/// - a `Runner`. You must call `.run()` on it in a background task.
pub async fn new<'a, const N_RX: usize, const N_TX: usize, C: Chip, SPI: SpiDevice, INT: Wait, RST: OutputPin>(
mac_addr: [u8; 6],
state: &'a mut State<N_RX, N_TX>,
spi_dev: SPI,
int: INT,
mut reset: RST,
) -> (Device<'a>, Runner<'a, C, SPI, INT, RST>) {
// Reset the chip.
reset.set_low().ok();
// Ensure the reset is registered.
Timer::after(Duration::from_millis(1)).await;
reset.set_high().ok();
// Wait for PLL lock. Some chips are slower than others.
// Slowest is w5100s which is 100ms, so let's just wait that.
Timer::after(Duration::from_millis(100)).await;
let mac = WiznetDevice::new(spi_dev, mac_addr).await.unwrap();
let (runner, device) = ch::new(&mut state.ch_state, ch::driver::HardwareAddress::Ethernet(mac_addr));
(
device,
Runner {
ch: runner,
mac,
int,
_reset: reset,
},
)
}
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