Implement MII interface

- Extend the eth/v2 module to support MII besides RMII.
- Replace `Ethernet::new` with `Ethernet::new_mii` and
  `Ethernet::new_rmii`.
- Update ethernet examples.
- Add example for MII ethernet.

3 files changed, 144 insertions, 2 deletions

diff --git a/examples/stm32h7/src/bin/eth.rs b/examples/stm32h7/src/bin/eth.rs
index cd9a27fcd..9abdcf3c0 100644
--- a/examples/stm32h7/src/bin/eth.rs
+++ b/examples/stm32h7/src/bin/eth.rs
@@ -64,7 +64,7 @@ async fn main(spawner: Spawner) -> ! {
     let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];
 
     static PACKETS: StaticCell<PacketQueue<4, 4>> = StaticCell::new();
-    let device = Ethernet::new(
+    let device = Ethernet::new_rmii(
         PACKETS.init(PacketQueue::<4, 4>::new()),
         p.ETH,
         Irqs,
diff --git a/examples/stm32h7/src/bin/eth_client.rs b/examples/stm32h7/src/bin/eth_client.rs
index dcc6e36e2..c4da5776f 100644
--- a/examples/stm32h7/src/bin/eth_client.rs
+++ b/examples/stm32h7/src/bin/eth_client.rs
@@ -65,7 +65,7 @@ async fn main(spawner: Spawner) -> ! {
     let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];
 
     static PACKETS: StaticCell<PacketQueue<16, 16>> = StaticCell::new();
-    let device = Ethernet::new(
+    let device = Ethernet::new_rmii(
         PACKETS.init(PacketQueue::<16, 16>::new()),
         p.ETH,
         Irqs,
diff --git a/examples/stm32h7/src/bin/eth_client_mii.rs b/examples/stm32h7/src/bin/eth_client_mii.rs
new file mode 100644
index 000000000..de6ea522a
--- /dev/null
+++ b/examples/stm32h7/src/bin/eth_client_mii.rs
@@ -0,0 +1,142 @@
+#![no_std]
+#![no_main]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_net::tcp::client::{TcpClient, TcpClientState};
+use embassy_net::{Stack, StackResources};
+use embassy_stm32::eth::generic_smi::GenericSMI;
+use embassy_stm32::eth::{Ethernet, PacketQueue};
+use embassy_stm32::peripherals::ETH;
+use embassy_stm32::rng::Rng;
+use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
+use embassy_time::Timer;
+use embedded_io_async::Write;
+use embedded_nal_async::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpConnect};
+use rand_core::RngCore;
+use static_cell::StaticCell;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    ETH => eth::InterruptHandler;
+    RNG => rng::InterruptHandler<peripherals::RNG>;
+});
+
+type Device = Ethernet<'static, ETH, GenericSMI>;
+
+#[embassy_executor::task]
+async fn net_task(stack: &'static Stack<Device>) -> ! {
+    stack.run().await
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) -> ! {
+    let mut config = Config::default();
+    {
+        use embassy_stm32::rcc::*;
+        config.rcc.hsi = Some(HSIPrescaler::DIV1);
+        config.rcc.csi = true;
+        config.rcc.hsi48 = Some(Default::default()); // needed for RNG
+        config.rcc.pll1 = Some(Pll {
+            source: PllSource::HSI,
+            prediv: PllPreDiv::DIV4,
+            mul: PllMul::MUL50,
+            divp: Some(PllDiv::DIV2),
+            divq: None,
+            divr: None,
+        });
+        config.rcc.sys = Sysclk::PLL1_P; // 400 Mhz
+        config.rcc.ahb_pre = AHBPrescaler::DIV2; // 200 Mhz
+        config.rcc.apb1_pre = APBPrescaler::DIV2; // 100 Mhz
+        config.rcc.apb2_pre = APBPrescaler::DIV2; // 100 Mhz
+        config.rcc.apb3_pre = APBPrescaler::DIV2; // 100 Mhz
+        config.rcc.apb4_pre = APBPrescaler::DIV2; // 100 Mhz
+        config.rcc.voltage_scale = VoltageScale::Scale1;
+    }
+    let p = embassy_stm32::init(config);
+    info!("Hello World!");
+
+    // Generate random seed.
+    let mut rng = Rng::new(p.RNG, Irqs);
+    let mut seed = [0; 8];
+    rng.fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
+
+    let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];
+
+    static PACKETS: StaticCell<PacketQueue<16, 16>> = StaticCell::new();
+
+    let device = Ethernet::new_mii(
+        PACKETS.init(PacketQueue::<16, 16>::new()),
+        p.ETH,
+        Irqs,
+        p.PA1,
+        p.PC3,
+        p.PA2,
+        p.PC1,
+        p.PA7,
+        p.PC4,
+        p.PC5,
+        p.PB0,
+        p.PB1,
+        p.PG13,
+        p.PG12,
+        p.PC2,
+        p.PE2,
+        p.PG11,
+        GenericSMI::new(1),
+        mac_addr,
+    );
+    info!("Device created");
+
+    let config = embassy_net::Config::dhcpv4(Default::default());
+    //let config = embassy_net::Config::ipv4_static(embassy_net::StaticConfigV4 {
+    //    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
+    static STACK: StaticCell<Stack<Device>> = StaticCell::new();
+    static RESOURCES: StaticCell<StackResources<3>> = StaticCell::new();
+    let stack = &*STACK.init(Stack::new(
+        device,
+        config,
+        RESOURCES.init(StackResources::<3>::new()),
+        seed,
+    ));
+
+    // Launch network task
+    unwrap!(spawner.spawn(net_task(stack)));
+
+    // Ensure DHCP configuration is up before trying connect
+    stack.wait_config_up().await;
+
+    info!("Network task initialized");
+
+    let state: TcpClientState<1, 1024, 1024> = TcpClientState::new();
+    let client = TcpClient::new(&stack, &state);
+
+    loop {
+        // You need to start a server on the host machine, for example: `nc -l 8000`
+        let addr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(192, 168, 100, 1), 8000));
+
+        info!("connecting...");
+        let r = client.connect(addr).await;
+        if let Err(e) = r {
+            info!("connect error: {:?}", e);
+            Timer::after_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);
+                break;
+            }
+            Timer::after_secs(1).await;
+        }
+    }
+}