Add v1c ethernet driver for the STM32F7 family.

3 files changed, 156 insertions, 2 deletions

diff --git a/examples/stm32f7/Cargo.toml b/examples/stm32f7/Cargo.toml
index cda2d777..f49a23e3 100644
--- a/examples/stm32f7/Cargo.toml
+++ b/examples/stm32f7/Cargo.toml
@@ -19,8 +19,10 @@ 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", "stm32f767zi", "unstable-pac", "time-driver-tim2"]  }
+embassy-stm32 = { version = "0.1.0", path = "../../embassy-stm32", features = ["defmt", "defmt-trace", "net", "stm32f767zi", "unstable-pac", "time-driver-tim2"]  }
 embassy-hal-common = {version = "0.1.0", path = "../../embassy-hal-common" }
+embassy-net = { path = "../../embassy-net", default-features = false, features = ["defmt-debug", "defmt", "tcp", "medium-ethernet", "pool-16"] }
+embassy-macros = { path = "../../embassy-macros" }
 
 defmt = "0.2.3"
 defmt-rtt = "0.2.0"
@@ -33,3 +35,17 @@ futures = { version = "0.3.17", default-features = false, features = ["async-awa
 rtt-target = { version = "0.3.1", features = ["cortex-m"] }
 heapless = { version = "0.7.5", default-features = false }
 nb = "1.0.0"
+rand_core = "0.6.3"
+critical-section = "0.2.3"
+
+
+[dependencies.smoltcp]
+git = "https://github.com/smoltcp-rs/smoltcp"
+rev = "e4241510337e095b9d21136c5f58b2eaa1b78479"
+default-features = false
+features = [
+    "proto-ipv4",
+    "socket",
+    "async",
+    "defmt",
+]
diff --git a/examples/stm32f7/src/bin/eth.rs b/examples/stm32f7/src/bin/eth.rs
new file mode 100644
index 00000000..afb86086
--- /dev/null
+++ b/examples/stm32f7/src/bin/eth.rs
@@ -0,0 +1,128 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::config;
+
+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, StackResources, StaticConfigurator, TcpSocket,
+};
+use embassy_stm32::eth::lan8742a::LAN8742A;
+use embassy_stm32::eth::{Ethernet, State};
+use embassy_stm32::rng::Rng;
+use embassy_stm32::{interrupt, peripherals};
+use heapless::Vec;
+use panic_probe as _;
+
+use peripherals::RNG;
+
+#[embassy::task]
+async fn main_task(
+    device: &'static mut Ethernet<'static, LAN8742A, 4, 4>,
+    config: &'static mut StaticConfigurator,
+    spawner: Spawner,
+) {
+    let net_resources = NET_RESOURCES.put(StackResources::new());
+
+    // Init network stack
+    embassy_net::init(device, config, net_resources);
+
+    // 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<Rng<RNG>> = None;
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+static STATE: Forever<State<'static, 4, 4>> = Forever::new();
+static ETH: Forever<Ethernet<'static, LAN8742A, 4, 4>> = Forever::new();
+static CONFIG: Forever<StaticConfigurator> = Forever::new();
+static NET_RESOURCES: Forever<StackResources<1, 2, 8>> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    info!("Setup RCC...");
+
+    let p = embassy_stm32::init(config());
+
+    let rng = Rng::new(p.RNG);
+    unsafe {
+        RNG_INST.replace(rng);
+    }
+
+    let eth_int = interrupt_take!(ETH);
+    let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];
+    let state = STATE.put(State::new());
+
+    let eth = unsafe {
+        ETH.put(Ethernet::new(
+            state, p.ETH, eth_int, p.PA1, p.PA2, p.PC1, p.PA7, p.PC4, p.PC5, p.PG13, p.PB13,
+            p.PG11, LAN8742A, mac_addr, 0,
+        ))
+    };
+
+    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.run(move |spawner| {
+        unwrap!(spawner.spawn(main_task(eth, config, spawner)));
+    })
+}
diff --git a/examples/stm32f7/src/example_common.rs b/examples/stm32f7/src/example_common.rs
index 54d63383..a786cb11 100644
--- a/examples/stm32f7/src/example_common.rs
+++ b/examples/stm32f7/src/example_common.rs
@@ -1,6 +1,9 @@
 #![macro_use]
 
-use defmt_rtt as _; // global logger
+use defmt_rtt as _;
+use embassy_stm32::time::U32Ext;
+use embassy_stm32::Config;
+// global logger
 use panic_probe as _;
 
 pub use defmt::*;
@@ -15,3 +18,10 @@ defmt::timestamp! {"{=u64}", {
         n as u64
     }
 }
+
+#[allow(unused)]
+pub fn config() -> Config {
+    let mut config = Config::default();
+    config.rcc.sys_ck = Some(200.mhz().into());
+    config
+}