Example first draft

1 files changed, 145 insertions, 0 deletions

diff --git a/examples/rp/src/bin/ethernet_w55rp20_tcp_server.rs b/examples/rp/src/bin/ethernet_w55rp20_tcp_server.rs
new file mode 100644
index 000000000..6f4ba4a70
--- /dev/null
+++ b/examples/rp/src/bin/ethernet_w55rp20_tcp_server.rs
@@ -0,0 +1,145 @@
+//! This example implements a TCP client that attempts to connect to a host on port 1234 and send it some data once per second.
+//!
+//! Example written for the [`WIZnet W55RP20-EVB-Pico`](https://docs.wiznet.io/Product/ioNIC/W55RP20/w55rp20-evb-pico) board.
+//! Note: the W55RP20 is a single package that contains both a RP2040 and the Wiznet W5500 ethernet
+//! controller
+
+#![no_std]
+#![no_main]
+
+use core::str::FromStr;
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_futures::yield_now;
+use embassy_net::{Stack, StackResources};
+use embassy_net_wiznet::chip::W5500;
+use embassy_net_wiznet::*;
+use embassy_rp::clocks::RoscRng;
+use embassy_rp::gpio::{Input, Level, Output, Pull};
+use embassy_rp::peripherals::PIO0;
+use embassy_rp::pio_programs::spi::Spi;
+use embassy_rp::spi::{Async, Config as SpiConfig};
+use embassy_rp::{bind_interrupts, pio};
+use embassy_time::{Delay, Duration, Timer};
+use embedded_hal_bus::spi::ExclusiveDevice;
+use embedded_io_async::Write;
+use static_cell::StaticCell;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    PIO0_IRQ_0 => pio::InterruptHandler<PIO0>;
+});
+
+#[embassy_executor::task]
+async fn ethernet_task(
+    runner: Runner<
+        'static,
+        W5500,
+        ExclusiveDevice<Spi<'static, PIO0, 0, Async>, Output<'static>, Delay>,
+        Input<'static>,
+        Output<'static>,
+    >,
+) -> ! {
+    runner.run().await
+}
+
+#[embassy_executor::task]
+async fn net_task(mut runner: embassy_net::Runner<'static, Device<'static>>) -> ! {
+    runner.run().await
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let p = embassy_rp::init(Default::default());
+    let mut rng = RoscRng;
+    let mut led = Output::new(p.PIN_19, Level::Low);
+
+    // The W55RP20 uses a PIO unit for SPI communication, once the SPI bus has been formed using a
+    // PIO statemachine everything else is generally unchanged from the other examples that use the W5500
+    let mosi = p.PIN_23;
+    let miso = p.PIN_22;
+    let clk = p.PIN_21;
+
+    let pio::Pio { mut common, sm0, .. } = pio::Pio::new(p.PIO0, Irqs);
+
+    // Construct an SPI driver backed by a PIO state machine
+    let mut spi_cfg = SpiConfig::default();
+    spi_cfg.frequency = 50_000_000;
+    let spi = Spi::new(&mut common, sm0, clk, mosi, miso, p.DMA_CH0, p.DMA_CH1, spi_cfg);
+
+    // Further control pins
+    let cs = Output::new(p.PIN_20, Level::High);
+    let w5500_int = Input::new(p.PIN_24, Pull::Up);
+    let w5500_reset = Output::new(p.PIN_25, Level::High);
+
+    let mac_addr = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00];
+    static STATE: StaticCell<State<8, 8>> = StaticCell::new();
+    let state = STATE.init(State::<8, 8>::new());
+    let (device, runner) = embassy_net_wiznet::new(
+        mac_addr,
+        state,
+        ExclusiveDevice::new(spi, cs, Delay),
+        w5500_int,
+        w5500_reset,
+    )
+    .await
+    .unwrap();
+    spawner.spawn(unwrap!(ethernet_task(runner)));
+
+    // Generate random seed
+    let seed = rng.next_u64();
+
+    // Init network stack
+    static RESOURCES: StaticCell<StackResources<3>> = StaticCell::new();
+    let (stack, runner) = embassy_net::new(
+        device,
+        embassy_net::Config::dhcpv4(Default::default()),
+        RESOURCES.init(StackResources::new()),
+        seed,
+    );
+
+    // Launch network task
+    spawner.spawn(unwrap!(net_task(runner)));
+
+    info!("Waiting for DHCP...");
+    let cfg = wait_for_config(stack).await;
+    let local_addr = cfg.address.address();
+    info!("IP address: {:?}", local_addr);
+
+    let mut rx_buffer = [0; 4096];
+    let mut tx_buffer = [0; 4096];
+    loop {
+        let mut socket = embassy_net::tcp::TcpSocket::new(stack, &mut rx_buffer, &mut tx_buffer);
+        socket.set_timeout(Some(Duration::from_secs(10)));
+
+        led.set_low();
+        info!("Connecting...");
+        let host_addr = embassy_net::Ipv4Address::from_str("192.168.1.110").unwrap();
+        if let Err(e) = socket.connect((host_addr, 1234)).await {
+            warn!("connect error: {:?}", e);
+            continue;
+        }
+        info!("Connected to {:?}", socket.remote_endpoint());
+        led.set_high();
+
+        let msg = b"Hello world!\n";
+        loop {
+            if let Err(e) = socket.write_all(msg).await {
+                warn!("write error: {:?}", e);
+                break;
+            }
+            info!("txd: {}", core::str::from_utf8(msg).unwrap());
+            Timer::after_secs(1).await;
+        }
+    }
+}
+
+async fn wait_for_config(stack: Stack<'static>) -> embassy_net::StaticConfigV4 {
+    loop {
+        if let Some(config) = stack.config_v4() {
+            return config.clone();
+        }
+        yield_now().await;
+    }
+}