stm32h7: Add ethernet example

embassy-stm32/Cargo.toml

@@ -10,7 +10,7 @@ embassy = { version = "0.1.0", path = "../embassy" }
 embassy-macros = { version = "0.1.0", path = "../embassy-macros", features = ["stm32"] }
 embassy-extras = {version = "0.1.0", path = "../embassy-extras" }
 embassy-traits = {version = "0.1.0", path = "../embassy-traits" }
-embassy-net = { version = "0.1.0", path = "../embassy-net", features = ["tcp", "medium-ethernet"], optional = true }
+embassy-net = { version = "0.1.0", path = "../embassy-net", default-features = false, optional = true }
 
 defmt = { version = "0.2.0", optional = true }
 log = { version = "0.4.11", optional = true }

examples/stm32h7/.cargo/config

@@ -0,0 +1,10 @@
+[target.thumbv7em-none-eabihf]
+runner = 'probe-run --chip STM32H743ZITx'
+rustflags = [
+  # LLD (shipped with the Rust toolchain) is used as the default linker
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+]
+
+[build]
+target = "thumbv7em-none-eabihf" # Cortex-M4F and Cortex-M7F (with FPU)

examples/stm32h7/Cargo.toml

@@ -19,8 +19,11 @@ defmt-error = []
 [dependencies]
 embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
 embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
-embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32h743zi"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "stm32h743zi", "net"] }
 embassy-extras = {version = "0.1.0", path = "../../embassy-extras" }
+embassy-net = { path = "../../embassy-net", default-features = false, features = ["defmt-debug", "defmt", "tcp", "medium-ethernet", "pool-16"] }
+stm32-metapac = { path = "../../stm32-metapac", features = ["stm32h743zi"] }
+embassy-macros = { path = "../../embassy-macros" }
 stm32h7 = { version = "0.13", features = ["stm32h743"]}
 stm32h7xx-hal = { version = "0.9.0", features = ["stm32h743"] }
 
@@ -34,6 +37,18 @@ panic-probe = { version = "0.2.0", features= ["print-defmt"] }
 futures = { version = "0.3.8", default-features = false, features = ["async-await"] }
 rtt-target = { version = "0.3", features = ["cortex-m"] }
 heapless = { version = "0.7.1", default-features = false }
+rand_core = { version = "0.6.2" }
+critical-section = "0.2.1"
 
 micromath = "2.0.0"
 
+[dependencies.smoltcp]
+git = "https://github.com/smoltcp-rs/smoltcp"
+rev = "e4241510337e095b9d21136c5f58b2eaa1b78479"
+default-features = false
+features = [
+  "proto-ipv4",
+  "socket",
+  "async",
+  "defmt",
+]

examples/stm32h7/build.rs

@@ -0,0 +1,21 @@
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+}

examples/stm32h7/memory.x

@@ -1,5 +1,5 @@
 MEMORY
 {
   FLASH : ORIGIN = 0x08000000, LENGTH = 2048K
-  RAM : ORIGIN = 0x20000000, LENGTH = 128K
+  RAM : ORIGIN = 0x24000000, LENGTH = 384K
 }

examples/stm32h7/src/bin/eth.rs

@@ -0,0 +1,167 @@
+#![no_std]
+#![no_main]
+#![feature(trait_alias)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![feature(type_alias_impl_trait)]
+
+use core::pin::Pin;
+use core::sync::atomic::{AtomicUsize, Ordering};
+
+use cortex_m_rt::entry;
+use defmt::{info, unwrap};
+use defmt_rtt as _; // global logger
+use embassy::executor::{Executor, Spawner};
+use embassy::io::AsyncWriteExt;
+use embassy::time::{Duration, Timer};
+use embassy::util::Forever;
+use embassy_macros::interrupt_take;
+use embassy_net::{Config as NetConfig, Ipv4Address, Ipv4Cidr, StaticConfigurator, TcpSocket};
+use embassy_stm32::clock::{Alarm, Clock};
+use embassy_stm32::eth::lan8742a::LAN8742A;
+use embassy_stm32::eth::Ethernet;
+use embassy_stm32::rcc::{Config as RccConfig, Rcc};
+use embassy_stm32::rng::Random;
+use embassy_stm32::time::Hertz;
+use embassy_stm32::{interrupt, peripherals, Config};
+use heapless::Vec;
+use panic_probe as _;
+use peripherals::{RNG, TIM2};
+
+defmt::timestamp! {"{=u64}", {
+        static COUNT: AtomicUsize = AtomicUsize::new(0);
+        // NOTE(no-CAS) `timestamps` runs with interrupts disabled
+        let n = COUNT.load(Ordering::Relaxed);
+        COUNT.store(n + 1, Ordering::Relaxed);
+        n as u64
+    }
+}
+
+#[embassy::task]
+async fn main_task(
+    device: &'static mut Pin<&'static mut Ethernet<'static, LAN8742A, 4, 4>>,
+    config: &'static mut StaticConfigurator,
+    spawner: Spawner,
+) {
+    // Init network stack
+    embassy_net::init(device, config);
+
+    // Launch network task
+    unwrap!(spawner.spawn(net_task()));
+
+    info!("Network task initialized");
+
+    // Then we can use it!
+    let mut rx_buffer = [0; 1024];
+    let mut tx_buffer = [0; 1024];
+    let mut socket = TcpSocket::new(&mut rx_buffer, &mut tx_buffer);
+
+    socket.set_timeout(Some(embassy_net::SmolDuration::from_secs(10)));
+
+    let remote_endpoint = (Ipv4Address::new(192, 168, 0, 10), 8000);
+    let r = socket.connect(remote_endpoint).await;
+    if let Err(e) = r {
+        info!("connect error: {:?}", e);
+        return;
+    }
+    info!("connected!");
+    loop {
+        let r = socket.write_all(b"Hello\n").await;
+        if let Err(e) = r {
+            info!("write error: {:?}", e);
+            return;
+        }
+        Timer::after(Duration::from_secs(1)).await;
+    }
+}
+
+#[embassy::task]
+async fn net_task() {
+    embassy_net::run().await
+}
+
+#[no_mangle]
+fn _embassy_rand(buf: &mut [u8]) {
+    use rand_core::RngCore;
+
+    critical_section::with(|_| unsafe {
+        unwrap!(RNG_INST.as_mut()).fill_bytes(buf);
+    });
+}
+
+static mut RNG_INST: Option<Random<RNG>> = None;
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+static TIMER_RTC: Forever<Clock<TIM2>> = Forever::new();
+static ALARM: Forever<Alarm<TIM2>> = Forever::new();
+static ETH: Forever<Ethernet<'static, LAN8742A, 4, 4>> = Forever::new();
+static DEVICE: Forever<Pin<&'static mut Ethernet<'static, LAN8742A, 4, 4>>> = Forever::new();
+static CONFIG: Forever<StaticConfigurator> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    use stm32_metapac::RCC;
+
+    info!("Hello World!");
+
+    info!("Setup RCC...");
+    let mut rcc_config = RccConfig::default();
+    rcc_config.sys_ck = Some(Hertz(400_000_000));
+    rcc_config.pll1.q_ck = Some(Hertz(100_000_000));
+    let config = Config::default().rcc(rcc_config);
+
+    let mut p = embassy_stm32::init(config);
+
+    // Constrain and Freeze clock
+
+    let mut rcc = Rcc::new(&mut p.RCC, RccConfig::default());
+    rcc.enable_debug_wfe(&mut p.DBGMCU, true);
+
+    unsafe {
+        RCC.ahb4enr().modify(|w| {
+            w.set_gpioaen(true);
+            w.set_gpioben(true);
+            w.set_gpiocen(true);
+            w.set_gpioden(true);
+            w.set_gpioien(true);
+        });
+    }
+
+    let rtc_int = interrupt_take!(TIM2);
+    let rtc = TIMER_RTC.put(Clock::new(p.TIM2, rtc_int));
+    rtc.start();
+    let alarm = ALARM.put(rtc.alarm1());
+
+    unsafe { embassy::time::set_clock(rtc) };
+
+    let rng = Random::new(p.RNG);
+    unsafe {
+        RNG_INST.replace(rng);
+    }
+
+    let eth_int = interrupt_take!(ETH);
+    let mac_addr = [0x10; 6];
+    let eth = ETH.put(Ethernet::new(
+        p.ETH, eth_int, p.PA1, p.PA2, p.PC1, p.PA7, p.PC4, p.PC5, p.PB12, p.PB13, p.PB11, LAN8742A,
+        mac_addr, 1,
+    ));
+
+    // NOTE(unsafe) This thing is a &'static
+    let net_device = DEVICE.put(unsafe { Pin::new_unchecked(eth) });
+    net_device.as_mut().init();
+
+    let config = StaticConfigurator::new(NetConfig {
+        address: Ipv4Cidr::new(Ipv4Address::new(192, 168, 0, 61), 24),
+        dns_servers: Vec::new(),
+        gateway: Some(Ipv4Address::new(192, 168, 0, 1)),
+    });
+
+    let config = CONFIG.put(config);
+
+    let executor = EXECUTOR.put(Executor::new());
+    executor.set_alarm(alarm);
+
+    executor.run(move |spawner| {
+        unwrap!(spawner.spawn(main_task(net_device, config, spawner)));
+    })
+}