From 2e76b13a4c5fcf46b3a9fc58ceef91e9317c12b7 Mon Sep 17 00:00:00 2001
From: Ulf Lilleengen <lulf@redhat.com>
Date: Tue, 9 Aug 2022 14:44:18 +0200
Subject: [PATCH] Add example using embedded-nal-async traits

---
 examples/stm32h7/src/bin/eth_client.rs | 125 +++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 examples/stm32h7/src/bin/eth_client.rs

diff --git a/examples/stm32h7/src/bin/eth_client.rs b/examples/stm32h7/src/bin/eth_client.rs
new file mode 100644
index 000000000..a66c6f196
--- /dev/null
+++ b/examples/stm32h7/src/bin/eth_client.rs
@@ -0,0 +1,125 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::executor::Spawner;
+use embassy_executor::time::{Duration, Timer};
+use embassy_net::tcp::client::{TcpClient, TcpClientState};
+use embassy_net::{Stack, StackResources};
+use embassy_stm32::eth::generic_smi::GenericSMI;
+use embassy_stm32::eth::{Ethernet, State};
+use embassy_stm32::peripherals::ETH;
+use embassy_stm32::rng::Rng;
+use embassy_stm32::time::mhz;
+use embassy_stm32::{interrupt, Config, Peripherals};
+use embassy_util::Forever;
+use embedded_io::asynch::Write;
+use embedded_nal_async::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpConnect};
+use rand_core::RngCore;
+use {defmt_rtt as _, panic_probe as _};
+
+macro_rules! forever {
+    ($val:expr) => {{
+        type T = impl Sized;
+        static FOREVER: Forever<T> = Forever::new();
+        FOREVER.put_with(move || $val)
+    }};
+}
+
+type Device = Ethernet<'static, ETH, GenericSMI, 4, 4>;
+
+#[embassy_executor::task]
+async fn net_task(stack: &'static Stack<Device>) -> ! {
+    stack.run().await
+}
+
+pub fn config() -> Config {
+    let mut config = Config::default();
+    config.rcc.sys_ck = Some(mhz(400));
+    config.rcc.hclk = Some(mhz(200));
+    config.rcc.pll1.q_ck = Some(mhz(100));
+    config
+}
+
+#[embassy_executor::main(config = "config()")]
+async fn main(spawner: Spawner, p: Peripherals) -> ! {
+    info!("Hello World!");
+
+    // Generate random seed.
+    let mut rng = Rng::new(p.RNG);
+    let mut seed = [0; 8];
+    rng.fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
+
+    let eth_int = interrupt::take!(ETH);
+    let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];
+
+    let device = unsafe {
+        Ethernet::new(
+            forever!(State::new()),
+            p.ETH,
+            eth_int,
+            p.PA1,
+            p.PA2,
+            p.PC1,
+            p.PA7,
+            p.PC4,
+            p.PC5,
+            p.PG13,
+            p.PB13,
+            p.PG11,
+            GenericSMI,
+            mac_addr,
+            0,
+        )
+    };
+
+    let config = embassy_net::ConfigStrategy::Dhcp;
+    //let config = embassy_net::ConfigStrategy::Static(embassy_net::Config {
+    //    address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 61), 24),
+    //    dns_servers: Vec::new(),
+    //    gateway: Some(Ipv4Address::new(10, 42, 0, 1)),
+    //});
+
+    // Init network stack
+    let stack = &*forever!(Stack::new(
+        device,
+        config,
+        forever!(StackResources::<1, 2, 8>::new()),
+        seed
+    ));
+
+    // Launch network task
+    unwrap!(spawner.spawn(net_task(&stack)));
+
+    info!("Network task initialized");
+
+    // To ensure DHCP configuration before trying connect
+    Timer::after(Duration::from_secs(20)).await;
+
+    static STATE: TcpClientState<1, 1024, 1024> = TcpClientState::new();
+    let client = TcpClient::new(&stack, &STATE);
+
+    loop {
+        let addr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(10, 42, 0, 1), 8000));
+
+        info!("connecting...");
+        let r = client.connect(addr).await;
+        if let Err(e) = r {
+            info!("connect error: {:?}", e);
+            Timer::after(Duration::from_secs(1)).await;
+            continue;
+        }
+        let mut connection = r.unwrap();
+        info!("connected!");
+        loop {
+            let r = connection.write_all(b"Hello\n").await;
+            if let Err(e) = r {
+                info!("write error: {:?}", e);
+                return;
+            }
+            Timer::after(Duration::from_secs(1)).await;
+        }
+    }
+}