136 lines
4.0 KiB
Rust
136 lines
4.0 KiB
Rust
//! This example implements a TCP echo server on port 1234 and using DHCP.
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//! Send it some data, you should see it echoed back and printed in the console.
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//!
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//! Example written for the [`WIZnet W5500-EVB-Pico`](https://www.wiznet.io/product-item/w5500-evb-pico/) board.
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#![no_std]
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#![no_main]
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#![feature(type_alias_impl_trait)]
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use defmt::*;
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use embassy_executor::Spawner;
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use embassy_futures::yield_now;
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use embassy_net::{Stack, StackResources};
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use embassy_net_wiznet::chip::W5500;
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use embassy_net_wiznet::*;
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use embassy_rp::clocks::RoscRng;
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use embassy_rp::gpio::{Input, Level, Output, Pull};
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use embassy_rp::peripherals::{PIN_17, PIN_20, PIN_21, SPI0};
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use embassy_rp::spi::{Async, Config as SpiConfig, Spi};
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use embassy_time::{Delay, Duration};
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use embedded_hal_bus::spi::ExclusiveDevice;
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use embedded_io_async::Write;
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use rand::RngCore;
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use static_cell::make_static;
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use {defmt_rtt as _, panic_probe as _};
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#[embassy_executor::task]
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async fn ethernet_task(
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runner: Runner<
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'static,
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W5500,
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ExclusiveDevice<Spi<'static, SPI0, Async>, Output<'static, PIN_17>, Delay>,
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Input<'static, PIN_21>,
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Output<'static, PIN_20>,
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>,
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) -> ! {
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runner.run().await
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}
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#[embassy_executor::task]
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async fn net_task(stack: &'static Stack<Device<'static>>) -> ! {
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stack.run().await
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}
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#[embassy_executor::main]
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async fn main(spawner: Spawner) {
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let p = embassy_rp::init(Default::default());
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let mut rng = RoscRng;
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let mut led = Output::new(p.PIN_25, Level::Low);
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let mut spi_cfg = SpiConfig::default();
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spi_cfg.frequency = 50_000_000;
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let (miso, mosi, clk) = (p.PIN_16, p.PIN_19, p.PIN_18);
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let spi = Spi::new(p.SPI0, clk, mosi, miso, p.DMA_CH0, p.DMA_CH1, spi_cfg);
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let cs = Output::new(p.PIN_17, Level::High);
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let w5500_int = Input::new(p.PIN_21, Pull::Up);
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let w5500_reset = Output::new(p.PIN_20, Level::High);
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let mac_addr = [0x02, 0x00, 0x00, 0x00, 0x00, 0x00];
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let state = make_static!(State::<8, 8>::new());
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let (device, runner) = embassy_net_wiznet::new(
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mac_addr,
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state,
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ExclusiveDevice::new(spi, cs, Delay),
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w5500_int,
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w5500_reset,
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)
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.await;
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unwrap!(spawner.spawn(ethernet_task(runner)));
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// Generate random seed
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let seed = rng.next_u64();
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// Init network stack
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let stack = &*make_static!(Stack::new(
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device,
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embassy_net::Config::dhcpv4(Default::default()),
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make_static!(StackResources::<2>::new()),
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seed
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));
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// Launch network task
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unwrap!(spawner.spawn(net_task(&stack)));
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info!("Waiting for DHCP...");
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let cfg = wait_for_config(stack).await;
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let local_addr = cfg.address.address();
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info!("IP address: {:?}", local_addr);
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let mut rx_buffer = [0; 4096];
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let mut tx_buffer = [0; 4096];
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let mut buf = [0; 4096];
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loop {
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let mut socket = embassy_net::tcp::TcpSocket::new(stack, &mut rx_buffer, &mut tx_buffer);
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socket.set_timeout(Some(Duration::from_secs(10)));
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led.set_low();
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info!("Listening on TCP:1234...");
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if let Err(e) = socket.accept(1234).await {
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warn!("accept error: {:?}", e);
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continue;
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}
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info!("Received connection from {:?}", socket.remote_endpoint());
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led.set_high();
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loop {
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let n = match socket.read(&mut buf).await {
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Ok(0) => {
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warn!("read EOF");
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break;
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}
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Ok(n) => n,
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Err(e) => {
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warn!("{:?}", e);
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break;
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}
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};
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info!("rxd {}", core::str::from_utf8(&buf[..n]).unwrap());
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if let Err(e) = socket.write_all(&buf[..n]).await {
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warn!("write error: {:?}", e);
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break;
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}
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}
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}
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}
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async fn wait_for_config(stack: &'static Stack<Device<'static>>) -> embassy_net::StaticConfigV4 {
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loop {
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if let Some(config) = stack.config_v4() {
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return config.clone();
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}
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yield_now().await;
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}
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}
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