:rainbow:

1 files changed, 114 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 000000000..bf14b05b4
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,114 @@
+#![no_std]
+/// [`embassy-net`](crates.io/crates/embassy-net) driver for the WIZnet W5500 ethernet chip.
+mod device;
+mod socket;
+mod spi;
+
+use crate::device::W5500;
+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;
+const MTU: usize = 1514;
+
+/// Type alias for the embassy-net driver for W5500
+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 W5500.
+///
+/// You must call `.run()` in a background task for the W5500 to operate.
+pub struct Runner<'d, SPI: SpiDevice, INT: Wait, RST: OutputPin> {
+    mac: W5500<SPI>,
+    ch: ch::Runner<'d, MTU>,
+    int: INT,
+    _reset: RST,
+}
+
+/// You must call this in a background task for the W5500 to operate.
+impl<'d, SPI: SpiDevice, INT: Wait, RST: OutputPin> Runner<'d, 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);
+            }
+        }
+    }
+}
+
+/// Obtain a driver for using the W5500 with [`embassy-net`](crates.io/crates/embassy-net).
+pub async fn new<
+    'a,
+    const N_RX: usize,
+    const N_TX: usize,
+    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, SPI, INT, RST>) {
+    // Reset the W5500.
+    reset.set_low().ok();
+    // Ensure the reset is registered.
+    Timer::after(Duration::from_millis(1)).await;
+    reset.set_high().ok();
+    // Wait for the W5500 to achieve PLL lock.
+    Timer::after(Duration::from_millis(2)).await;
+
+    let mac = W5500::new(spi_dev, mac_addr).await.unwrap();
+
+    let (runner, device) = ch::new(&mut state.ch_state, mac_addr);
+    (
+        device,
+        Runner {
+            ch: runner,
+            mac,
+            int,
+            _reset: reset,
+        },
+    )
+}