stm32h7: Add ethernet example

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)));
+    })
+}