291 lines
8.4 KiB
Rust
291 lines
8.4 KiB
Rust
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#![no_std]
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#![no_main]
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#![feature(generic_associated_types)]
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#![feature(type_alias_impl_trait)]
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use core::sync::atomic::{AtomicBool, Ordering};
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use core::task::Waker;
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use defmt::*;
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use defmt_rtt as _; // global logger
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use embassy::blocking_mutex::raw::ThreadModeRawMutex;
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use embassy::channel::Channel;
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use embassy::executor::Spawner;
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use embassy::util::Forever;
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use embassy_net::tcp::TcpSocket;
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use embassy_net::{PacketBox, PacketBoxExt, PacketBuf, Stack, StackResources};
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use embassy_stm32::interrupt;
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use embassy_stm32::rcc::*;
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use embassy_stm32::rng::Rng;
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use embassy_stm32::time::Hertz;
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use embassy_stm32::usb::Driver;
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use embassy_stm32::{Config, Peripherals};
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use embassy_usb::{Builder, UsbDevice};
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use embassy_usb_ncm::{CdcNcmClass, Receiver, Sender, State};
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use panic_probe as _;
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use defmt_rtt as _;
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use embedded_io::asynch::{Read, Write};
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// global logger
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use panic_probe as _;
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use rand_core::RngCore;
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type MyDriver = Driver<'static, embassy_stm32::peripherals::USB>;
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macro_rules! forever {
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($val:expr) => {{
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type T = impl Sized;
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static FOREVER: Forever<T> = Forever::new();
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FOREVER.put_with(move || $val)
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}};
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}
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#[embassy::task]
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async fn usb_task(mut device: UsbDevice<'static, MyDriver>) -> ! {
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device.run().await
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}
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#[embassy::task]
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async fn usb_ncm_rx_task(mut class: Receiver<'static, MyDriver>) {
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loop {
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warn!("WAITING for connection");
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LINK_UP.store(false, Ordering::Relaxed);
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class.wait_connection().await.unwrap();
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warn!("Connected");
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LINK_UP.store(true, Ordering::Relaxed);
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loop {
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let mut p = unwrap!(PacketBox::new(embassy_net::Packet::new()));
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let n = match class.read_packet(&mut p[..]).await {
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Ok(n) => n,
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Err(e) => {
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warn!("error reading packet: {:?}", e);
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break;
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}
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};
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let buf = p.slice(0..n);
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if RX_CHANNEL.try_send(buf).is_err() {
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warn!("Failed pushing rx'd packet to channel.");
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}
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}
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}
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}
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#[embassy::task]
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async fn usb_ncm_tx_task(mut class: Sender<'static, MyDriver>) {
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loop {
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let pkt = TX_CHANNEL.recv().await;
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if let Err(e) = class.write_packet(&pkt[..]).await {
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warn!("Failed to TX packet: {:?}", e);
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}
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}
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}
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#[embassy::task]
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async fn net_task(stack: &'static Stack<Device>) -> ! {
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stack.run().await
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}
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fn config() -> Config {
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let mut config = Config::default();
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config.rcc.mux = ClockSrc::HSE(Hertz(16_000_000));
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config.rcc.mux = ClockSrc::PLL(
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PLLSource::HSI16,
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PLLClkDiv::Div2,
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PLLSrcDiv::Div1,
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PLLMul::Mul10,
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None,
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);
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config.rcc.hsi48 = true;
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config
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}
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#[embassy::main(config = "config()")]
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async fn main(spawner: Spawner, p: Peripherals) {
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// Create the driver, from the HAL.
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let irq = interrupt::take!(USB_FS);
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let driver = Driver::new(p.USB, irq, p.PA12, p.PA11);
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// Create embassy-usb Config
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let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
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config.manufacturer = Some("Embassy");
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config.product = Some("USB-Ethernet example");
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config.serial_number = Some("12345678");
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config.max_power = 100;
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config.max_packet_size_0 = 64;
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// Required for Windows support.
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config.composite_with_iads = true;
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config.device_class = 0xEF;
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config.device_sub_class = 0x02;
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config.device_protocol = 0x01;
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struct Resources {
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device_descriptor: [u8; 256],
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config_descriptor: [u8; 256],
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bos_descriptor: [u8; 256],
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control_buf: [u8; 128],
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serial_state: State<'static>,
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}
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let res: &mut Resources = forever!(Resources {
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device_descriptor: [0; 256],
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config_descriptor: [0; 256],
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bos_descriptor: [0; 256],
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control_buf: [0; 128],
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serial_state: State::new(),
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});
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// Create embassy-usb DeviceBuilder using the driver and config.
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let mut builder = Builder::new(
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driver,
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config,
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&mut res.device_descriptor,
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&mut res.config_descriptor,
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&mut res.bos_descriptor,
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&mut res.control_buf,
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None,
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);
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// WARNINGS for Android ethernet tethering:
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// - On Pixel 4a, it refused to work on Android 11, worked on Android 12.
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// - if the host's MAC address has the "locally-administered" bit set (bit 1 of first byte),
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// it doesn't work! The "Ethernet tethering" option in settings doesn't get enabled.
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// This is due to regex spaghetti: https://android.googlesource.com/platform/frameworks/base/+/refs/tags/android-mainline-12.0.0_r84/core/res/res/values/config.xml#417
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// and this nonsense in the linux kernel: https://github.com/torvalds/linux/blob/c00c5e1d157bec0ef0b0b59aa5482eb8dc7e8e49/drivers/net/usb/usbnet.c#L1751-L1757
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// Our MAC addr.
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let our_mac_addr = [0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC];
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// Host's MAC addr. This is the MAC the host "thinks" its USB-to-ethernet adapter has.
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let host_mac_addr = [0x88, 0x88, 0x88, 0x88, 0x88, 0x88];
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// Create classes on the builder.
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let class = CdcNcmClass::new(&mut builder, &mut res.serial_state, host_mac_addr, 64);
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// Build the builder.
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let usb = builder.build();
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unwrap!(spawner.spawn(usb_task(usb)));
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let (tx, rx) = class.split();
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unwrap!(spawner.spawn(usb_ncm_rx_task(rx)));
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unwrap!(spawner.spawn(usb_ncm_tx_task(tx)));
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let config = embassy_net::ConfigStrategy::Dhcp;
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//let config = embassy_net::ConfigStrategy::Static(embassy_net::Config {
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// address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 61), 24),
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// dns_servers: Vec::new(),
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// gateway: Some(Ipv4Address::new(10, 42, 0, 1)),
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//});
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// Generate random seed
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let mut rng = Rng::new(p.RNG);
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let seed = rng.next_u64();
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// Init network stack
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let device = Device {
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mac_addr: our_mac_addr,
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};
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let stack = &*forever!(Stack::new(
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device,
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config,
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forever!(StackResources::<1, 2, 8>::new()),
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seed
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));
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unwrap!(spawner.spawn(net_task(stack)));
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// And now we can use it!
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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 = TcpSocket::new(stack, &mut rx_buffer, &mut tx_buffer);
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socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
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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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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!("read error: {:?}", e);
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break;
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}
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};
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info!("rxd {:02x}", &buf[..n]);
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match socket.write_all(&buf[..n]).await {
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Ok(()) => {}
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Err(e) => {
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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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}
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static TX_CHANNEL: Channel<ThreadModeRawMutex, PacketBuf, 8> = Channel::new();
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static RX_CHANNEL: Channel<ThreadModeRawMutex, PacketBuf, 8> = Channel::new();
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static LINK_UP: AtomicBool = AtomicBool::new(false);
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struct Device {
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mac_addr: [u8; 6],
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}
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impl embassy_net::Device for Device {
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fn register_waker(&mut self, waker: &Waker) {
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// loopy loopy wakey wakey
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waker.wake_by_ref()
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}
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fn link_state(&mut self) -> embassy_net::LinkState {
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match LINK_UP.load(Ordering::Relaxed) {
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true => embassy_net::LinkState::Up,
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false => embassy_net::LinkState::Down,
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}
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}
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fn capabilities(&self) -> embassy_net::DeviceCapabilities {
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let mut caps = embassy_net::DeviceCapabilities::default();
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caps.max_transmission_unit = 1514; // 1500 IP + 14 ethernet header
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caps.medium = embassy_net::Medium::Ethernet;
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caps
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}
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fn is_transmit_ready(&mut self) -> bool {
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true
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}
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fn transmit(&mut self, pkt: PacketBuf) {
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if TX_CHANNEL.try_send(pkt).is_err() {
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warn!("TX failed")
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}
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}
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fn receive<'a>(&mut self) -> Option<PacketBuf> {
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RX_CHANNEL.try_recv().ok()
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}
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fn ethernet_address(&self) -> [u8; 6] {
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self.mac_addr
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}
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}
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