nrf: 802.15.4 embassy-net-driver

8 files changed, 242 insertions, 2 deletions

diff --git a/embassy-net/README.md b/embassy-net/README.md
index 1722ffc7b..1c5b30a9c 100644
--- a/embassy-net/README.md
+++ b/embassy-net/README.md
@@ -25,6 +25,7 @@ unimplemented features of the network protocols.
 - [`embassy-stm32`](https://github.com/embassy-rs/embassy/tree/main/embassy-stm32) for the builtin Ethernet MAC in all STM32 chips (STM32F1, STM32F2, STM32F4, STM32F7, STM32H7, STM32H5).
 - [`embassy-net-wiznet`](https://github.com/embassy-rs/embassy/tree/main/embassy-net-wiznet) for Wiznet SPI Ethernet MAC+PHY chips (W5100S, W5500)
 - [`embassy-net-esp-hosted`](https://github.com/embassy-rs/embassy/tree/main/embassy-net-esp-hosted) for using ESP32 chips with the [`esp-hosted`](https://github.com/espressif/esp-hosted) firmware as WiFi adapters for another non-ESP32 MCU.
+- [`embassy-nrf`](https://github.com/embassy-rs/embassy/tree/main/embassy-nrf) for IEEE 802.15.4 support on nrf chips.
 
 ## Examples
 
diff --git a/embassy-nrf/CHANGELOG.md b/embassy-nrf/CHANGELOG.md
index 5dc941b25..befa34ecf 100644
--- a/embassy-nrf/CHANGELOG.md
+++ b/embassy-nrf/CHANGELOG.md
@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased - ReleaseDate
 
 - changed: nrf54l: Disable glitch detection and enable DC/DC in init.
+- changed: Add embassy-net-driver-channel implementation for IEEE 802.15.4
 
 ## 0.7.0 - 2025-08-26
 
diff --git a/embassy-nrf/Cargo.toml b/embassy-nrf/Cargo.toml
index 2ce75cfac..4afd28fbd 100644
--- a/embassy-nrf/Cargo.toml
+++ b/embassy-nrf/Cargo.toml
@@ -79,6 +79,9 @@ gpiote = []
 ## Use RTC1 as the time driver for `embassy-time`, with a tick rate of 32.768khz
 time-driver-rtc1 = ["_time-driver"]
 
+## Enable embassy-net 802.15.4 driver
+net-driver = ["_net-driver"]
+
 ## Allow using the NFC pins as regular GPIO pins (P0_09/P0_10 on nRF52, P0_02/P0_03 on nRF53)
 nfc-pins-as-gpio = []
 
@@ -154,6 +157,8 @@ _nrf91 = []
 
 _time-driver = ["dep:embassy-time-driver", "embassy-time-driver?/tick-hz-32_768", "dep:embassy-time-queue-utils", "embassy-embedded-hal/time"]
 
+_net-driver = ["dep:embassy-net-driver-channel","dep:embassy-futures"]
+
 # trustzone state.
 _s = []
 _ns = []
@@ -177,6 +182,8 @@ embassy-sync = { version = "0.7.2", path = "../embassy-sync" }
 embassy-hal-internal = { version = "0.3.0", path = "../embassy-hal-internal", features = ["cortex-m", "prio-bits-3"] }
 embassy-embedded-hal = { version = "0.5.0", path = "../embassy-embedded-hal", default-features = false }
 embassy-usb-driver = { version = "0.2.0", path = "../embassy-usb-driver" }
+embassy-net-driver-channel = { version = "0.3.2", path = "../embassy-net-driver-channel", optional = true}
+embassy-futures = { version = "0.1.2", path = "../embassy-futures", optional = true}
 
 embedded-hal-02 = { package = "embedded-hal", version = "0.2.6", features = ["unproven"] }
 embedded-hal-1 = { package = "embedded-hal", version = "1.0" }
diff --git a/embassy-nrf/README.md b/embassy-nrf/README.md
index 3df5f1fa5..26b1fa5ea 100644
--- a/embassy-nrf/README.md
+++ b/embassy-nrf/README.md
@@ -28,6 +28,10 @@ allows running Rust code without a SPM or TF-M binary, saving flash space and si
 
 If the `time-driver-rtc1` feature is enabled, the HAL uses the RTC peripheral as a global time driver for [embassy-time](https://crates.io/crates/embassy-time), with a tick rate of 32768 Hz.
 
+## Embassy-net-driver
+
+If the board supports IEEE 802.15.4 (see `src/radio/mod.rs`) the corresponding [embassy-net-driver](https://crates.io/crates/embassy-net-driver) implementation can be enabled with the feature `net-driver`.
+
 ## Embedded-hal
 
 The `embassy-nrf` HAL implements the traits from [embedded-hal](https://crates.io/crates/embedded-hal) (v0.2 and 1.0) and [embedded-hal-async](https://crates.io/crates/embedded-hal-async), as well as [embedded-io](https://crates.io/crates/embedded-io) and [embedded-io-async](https://crates.io/crates/embedded-io-async).
diff --git a/embassy-nrf/src/embassy_net_802154_driver.rs b/embassy-nrf/src/embassy_net_802154_driver.rs
new file mode 100644
index 000000000..8662be787
--- /dev/null
+++ b/embassy-nrf/src/embassy_net_802154_driver.rs
@@ -0,0 +1,96 @@
+//! embassy-net IEEE 802.15.4 driver
+
+use embassy_futures::select::{select3, Either3};
+use embassy_net_driver_channel::driver::LinkState;
+use embassy_net_driver_channel::{self as ch};
+use embassy_time::{Duration, Ticker};
+
+use crate::radio::ieee802154::{Packet, Radio};
+use crate::radio::InterruptHandler;
+use crate::{self as nrf, interrupt};
+
+/// MTU for the nrf radio.
+pub const MTU: usize = Packet::CAPACITY as usize;
+
+/// embassy-net device for the driver.
+pub type Device<'d> = embassy_net_driver_channel::Device<'d, MTU>;
+
+/// Internal state for the embassy-net driver.
+pub struct State<const N_RX: usize, const N_TX: usize> {
+    ch_state: ch::State<MTU, N_RX, N_TX>,
+}
+
+impl<const N_RX: usize, const N_TX: usize> State<N_RX, N_TX> {
+    /// Create a new `State`.
+    pub const fn new() -> Self {
+        Self {
+            ch_state: ch::State::new(),
+        }
+    }
+}
+
+/// Background runner for the driver.
+///
+/// You must call `.run()` in a background task for the driver to operate.
+pub struct Runner<'d, T: nrf::radio::Instance> {
+    radio: nrf::radio::ieee802154::Radio<'d, T>,
+    ch: ch::Runner<'d, MTU>,
+}
+
+impl<'d, T: nrf::radio::Instance> Runner<'d, T> {
+    /// Drives the radio. Needs to run to use the driver.
+    pub async fn run(mut self) -> ! {
+        let (state_chan, mut rx_chan, mut tx_chan) = self.ch.split();
+        let mut tick = Ticker::every(Duration::from_millis(500));
+        let mut packet = Packet::new();
+        state_chan.set_link_state(LinkState::Up);
+        loop {
+            match select3(
+                async {
+                    let rx_buf = rx_chan.rx_buf().await;
+                    self.radio.receive(&mut packet).await.ok().map(|_| rx_buf)
+                },
+                tx_chan.tx_buf(),
+                tick.next(),
+            )
+            .await
+            {
+                Either3::First(Some(rx_buf)) => {
+                    let len = rx_buf.len().min(packet.len() as usize);
+                    (&mut rx_buf[..len]).copy_from_slice(&*packet);
+                    rx_chan.rx_done(len);
+                }
+                Either3::Second(tx_buf) => {
+                    let len = tx_buf.len().min(Packet::CAPACITY as usize);
+                    packet.copy_from_slice(&tx_buf[..len]);
+                    self.radio.try_send(&mut packet).await.ok().unwrap();
+                    tx_chan.tx_done();
+                }
+                _ => {}
+            }
+        }
+    }
+}
+
+/// Make sure to use `HfclkSource::ExternalXtal` as the `hfclk_source`
+/// to use the radio (nrf52840 product spec v1.11 5.4.1)
+/// ```
+/// # use embassy_nrf::config::*;
+/// let mut config = Config::default();
+/// config.hfclk_source = HfclkSource::ExternalXtal;
+/// ```
+pub async fn new<'a, const N_RX: usize, const N_TX: usize, T: nrf::radio::Instance, Irq>(
+    mac_addr: [u8; 8],
+    radio: nrf::Peri<'a, T>,
+    irq: Irq,
+    state: &'a mut State<N_RX, N_TX>,
+) -> Result<(Device<'a>, Runner<'a, T>), ()>
+where
+    Irq: interrupt::typelevel::Binding<T::Interrupt, InterruptHandler<T>> + 'a,
+{
+    let radio = Radio::new(radio, irq);
+
+    let (runner, device) = ch::new(&mut state.ch_state, ch::driver::HardwareAddress::Ieee802154(mac_addr));
+
+    Ok((device, Runner { ch: runner, radio }))
+}
diff --git a/embassy-nrf/src/lib.rs b/embassy-nrf/src/lib.rs
index aa4801897..897e660b8 100644
--- a/embassy-nrf/src/lib.rs
+++ b/embassy-nrf/src/lib.rs
@@ -137,6 +137,17 @@ pub mod qspi;
 #[cfg(not(feature = "_nrf54l"))] // TODO
 #[cfg(not(any(feature = "_nrf91", feature = "_nrf5340-app")))]
 pub mod radio;
+
+#[cfg(any(
+    feature = "nrf52811",
+    feature = "nrf52820",
+    feature = "nrf52833",
+    feature = "nrf52840",
+    feature = "_nrf5340-net"
+))]
+#[cfg(feature = "_net-driver")]
+pub mod embassy_net_802154_driver;
+
 #[cfg(not(feature = "_nrf54l"))] // TODO
 #[cfg(feature = "_nrf5340")]
 pub mod reset;
diff --git a/examples/nrf52840/Cargo.toml b/examples/nrf52840/Cargo.toml
index a9339bcd3..452e83b7e 100644
--- a/examples/nrf52840/Cargo.toml
+++ b/examples/nrf52840/Cargo.toml
@@ -10,8 +10,8 @@ embassy-futures = { version = "0.1.2", path = "../../embassy-futures" }
 embassy-sync = { version = "0.7.2", path = "../../embassy-sync", features = ["defmt"] }
 embassy-executor = { version = "0.9.0", path = "../../embassy-executor", features = ["arch-cortex-m", "executor-thread", "executor-interrupt", "defmt"] }
 embassy-time = { version = "0.5.0", path = "../../embassy-time", features = ["defmt", "defmt-timestamp-uptime"] }
-embassy-nrf = { version = "0.7.0", path = "../../embassy-nrf", features = ["defmt", "nrf52840", "time-driver-rtc1", "gpiote", "unstable-pac", "time"] }
-embassy-net = { version = "0.7.1", path = "../../embassy-net", features = ["defmt", "tcp", "dhcpv4", "medium-ethernet"] }
+embassy-nrf = { version = "0.7.0", path = "../../embassy-nrf", features = ["defmt", "nrf52840", "time-driver-rtc1", "gpiote", "unstable-pac", "time", "net-driver"] }
+embassy-net = { version = "0.7.1", path = "../../embassy-net", features = ["defmt", "tcp", "dhcpv4", "medium-ethernet","udp", "medium-ieee802154", "proto-ipv6"] }
 embassy-usb = { version = "0.5.1", path = "../../embassy-usb", features = ["defmt"] }
 embedded-io = { version = "0.6.0", features = ["defmt-03"]  }
 embedded-io-async = { version = "0.6.1", features = ["defmt-03"] }
diff --git a/examples/nrf52840/src/bin/sixlowpan.rs b/examples/nrf52840/src/bin/sixlowpan.rs
new file mode 100644
index 000000000..00a597366
--- /dev/null
+++ b/examples/nrf52840/src/bin/sixlowpan.rs
@@ -0,0 +1,120 @@
+#![no_std]
+#![no_main]
+
+use core::net::Ipv6Addr;
+
+use defmt::{info, unwrap, warn};
+use embassy_executor::Spawner;
+use embassy_net::udp::{PacketMetadata, UdpMetadata, UdpSocket};
+use embassy_net::{IpAddress, IpEndpoint, IpListenEndpoint, Ipv6Cidr, StackResources, StaticConfigV6};
+use embassy_nrf::config::{Config, HfclkSource};
+use embassy_nrf::rng::Rng;
+use embassy_nrf::{bind_interrupts, embassy_net_802154_driver as net, peripherals, radio};
+use embassy_time::Delay;
+use embedded_hal_async::delay::DelayNs;
+use static_cell::StaticCell;
+use {defmt_rtt as _, panic_probe as _};
+
+bind_interrupts!(struct Irqs {
+    RADIO => radio::InterruptHandler<peripherals::RADIO>;
+    RNG => embassy_nrf::rng::InterruptHandler<peripherals::RNG>;
+});
+
+#[embassy_executor::task]
+async fn ieee802154_task(runner: net::Runner<'static, peripherals::RADIO>) -> ! {
+    runner.run().await
+}
+
+#[embassy_executor::task]
+async fn net_task(mut runner: embassy_net::Runner<'static, net::Device<'static>>) -> ! {
+    runner.run().await
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let mut config = Config::default();
+    // Necessary to run the radio nrf52840 v1.11 5.4.1
+    config.hfclk_source = HfclkSource::ExternalXtal;
+    let p = embassy_nrf::init(config);
+
+    let mac_addr: [u8; 8] = [2, 3, 4, 5, 6, 7, 8, 9];
+    static NRF802154_STATE: StaticCell<net::State<20, 20>> = StaticCell::new();
+    let (device, runner) = net::new(mac_addr, p.RADIO, Irqs, NRF802154_STATE.init(net::State::new()))
+        .await
+        .unwrap();
+
+    spawner.spawn(unwrap!(ieee802154_task(runner)));
+
+    // Swap these when flashing a second board
+    let peer = Ipv6Addr::new(0xfe80, 0, 0, 0, 0xd701, 0xda3f, 0x3955, 0x82a4);
+    let local = Ipv6Addr::new(0xfe80, 0, 0, 0, 0xd701, 0xda3f, 0x3955, 0x82a5);
+
+    let config = embassy_net::Config::ipv6_static(StaticConfigV6 {
+        address: Ipv6Cidr::new(local, 64),
+        gateway: None,
+        dns_servers: Default::default(),
+    });
+
+    // Generate random seed
+    let mut rng = Rng::new(p.RNG, Irqs);
+    let mut seed = [0; 8];
+    rng.blocking_fill_bytes(&mut seed);
+    let seed = u64::from_le_bytes(seed);
+
+    // Init network stack
+    static RESOURCES: StaticCell<StackResources<3>> = StaticCell::new();
+    let (stack, runner) = embassy_net::new(device, config, RESOURCES.init(StackResources::new()), seed);
+
+    spawner.spawn(unwrap!(net_task(runner)));
+
+    let mut rx_buffer = [0; 2096];
+    let mut tx_buffer = [0; 2096];
+    let mut tx_m_buffer = [PacketMetadata::EMPTY; 5];
+    let mut rx_m_buffer = [PacketMetadata::EMPTY; 5];
+
+    let mut delay = Delay;
+    loop {
+        let mut socket = UdpSocket::new(
+            stack,
+            &mut tx_m_buffer,
+            &mut rx_buffer,
+            &mut rx_m_buffer,
+            &mut tx_buffer,
+        );
+        socket
+            .bind(IpListenEndpoint {
+                addr: Some(IpAddress::Ipv6(local)),
+                port: 1234,
+            })
+            .unwrap();
+        let rep = UdpMetadata {
+            endpoint: IpEndpoint {
+                addr: IpAddress::Ipv6(peer),
+                port: 1234,
+            },
+            local_address: Some(IpAddress::Ipv6(local)),
+            meta: Default::default(),
+        };
+
+        info!("Listening on {:?} UDP:1234...", local);
+
+        let mut recv_buf = [0; 12];
+        loop {
+            delay.delay_ms(2000).await;
+            if socket.may_recv() {
+                let n = match socket.recv_from(&mut recv_buf).await {
+                    Ok((0, _)) => panic!(),
+                    Ok((n, _)) => n,
+                    Err(e) => {
+                        warn!("read error: {:?}", e);
+                        break;
+                    }
+                };
+                info!("Received {:02x}", &recv_buf[..n]);
+            }
+
+            info!("Sending");
+            socket.send_to(b"Hello World", rep).await.unwrap();
+        }
+    }
+}