Move examples to a subdirectory

51 files changed, 374 insertions, 36 deletions

diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 542107005..3fdc10ab2 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -26,12 +26,10 @@ jobs:
           - package: embassy
             target: thumbv6m-none-eabi
             features: defmt
-          - package: embassy-std-examples
-            target: x86_64-unknown-linux-gnu
-          - package: embassy-net-examples
+
+          - package: examples/std
             target: x86_64-unknown-linux-gnu
-          - package: embassy-nrf-examples
-            target: thumbv7em-none-eabi
+
           - package: embassy-nrf
             target: thumbv7em-none-eabi
             features: nrf52805
@@ -59,8 +57,12 @@ jobs:
           - package: embassy-nrf
             target: thumbv7em-none-eabi
             features: nrf52840,defmt
-          - package: embassy-rp-examples
+          - package: examples/nrf
+            target: thumbv7em-none-eabi
+
+          - package: examples/rp
             target: thumbv6m-none-eabi
+
           - package: embassy-stm32
             target: thumbv7em-none-eabi
             features: stm32f411ce,defmt
@@ -76,7 +78,7 @@ jobs:
           - package: embassy-stm32
             target: thumbv6m-none-eabi
             features: stm32l053r8,defmt
-          - package: embassy-stm32-examples
+          - package: examples/stm32f4
             target: thumbv7em-none-eabi
 
     steps:
diff --git a/.vscode/settings.json b/.vscode/settings.json
index ca242662b..4c6c3bece 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -3,8 +3,8 @@
   "editor.formatOnSave": true,
   "rust-analyzer.checkOnSave.allFeatures": false,
   "rust-analyzer.checkOnSave.allTargets": false,
-  "rust-analyzer.cargo.target": "thumbv7em-none-eabi",
-  "rust-analyzer.checkOnSave.target": "thumbv7em-none-eabi",
+  //"rust-analyzer.cargo.target": "thumbv7em-none-eabi",
+  //"rust-analyzer.checkOnSave.target": "thumbv7em-none-eabi",
   "rust-analyzer.procMacro.enable": true,
   "rust-analyzer.cargo.loadOutDirsFromCheck": true,
   "files.watcherExclude": {
diff --git a/Cargo.example.toml b/Cargo.example.toml
index 010487b51..da3a80299 100644
--- a/Cargo.example.toml
+++ b/Cargo.example.toml
@@ -25,20 +25,21 @@ members = [
 
     # nRF
     #"embassy-nrf",
-    #"embassy-nrf-examples",
+    #"examples/nrf",
 
     # stm32
     #"embassy-stm32",
-    #"embassy-stm32-examples",
     #"stm32-metapac",
+    # uncomment ONLY ONE example crate.
+    #"examples/stm32f4",
 
     # rp2040
     #"embassy-rp",
-    #"embassy-rp-examples",
+    #"examples/rp2040",
 
     # std
     #"embassy-std",
-    #"embassy-std-examples",
+    #"examples/std",
 ]
 
 [profile.dev]
diff --git a/embassy-std-examples/Cargo.toml b/embassy-std-examples/Cargo.toml
deleted file mode 100644
index 0998899c8..000000000
--- a/embassy-std-examples/Cargo.toml
+++ /dev/null
@@ -1,14 +0,0 @@
-[package]
-authors = ["Dario Nieuwenhuis <[email protected]>"]
-edition = "2018"
-name = "embassy-std-examples"
-version = "0.1.0"
-
-[dependencies]
-async-io = "1.3.1"
-embassy = { version = "0.1.0", path = "../embassy", features = ["log"] }
-embassy-std = { version = "0.1.0", path = "../embassy-std" }
-env_logger = "0.8.2"
-futures = { version = "0.3.8", default-features = false, features = ["async-await"] }
-log = "0.4.11"
-nix = "0.19.1"
diff --git a/embassy-nrf-examples/.cargo/config.toml b/examples/nrf/.cargo/config.toml
index 58ac3debd..58ac3debd 100644
--- a/embassy-nrf-examples/.cargo/config.toml
+++ b/examples/nrf/.cargo/config.toml
diff --git a/embassy-nrf-examples/Cargo.toml b/examples/nrf/Cargo.toml
index 4cec37522..fa1dab360 100644
--- a/embassy-nrf-examples/Cargo.toml
+++ b/examples/nrf/Cargo.toml
@@ -17,9 +17,9 @@ 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-nrf = { version = "0.1.0", path = "../embassy-nrf", features = ["defmt", "defmt-trace", "nrf52840"] }
+embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
+embassy-traits = { version = "0.1.0", path = "../../embassy-traits", features = ["defmt"] }
+embassy-nrf = { version = "0.1.0", path = "../../embassy-nrf", features = ["defmt", "defmt-trace", "nrf52840"] }
 
 defmt = "0.2.0"
 defmt-rtt = "0.2.0"
diff --git a/embassy-nrf-examples/build.rs b/examples/nrf/build.rs
index d534cc3df..d534cc3df 100644
--- a/embassy-nrf-examples/build.rs
+++ b/examples/nrf/build.rs
diff --git a/embassy-nrf-examples/memory.x b/examples/nrf/memory.x
index 9b04edec0..9b04edec0 100644
--- a/embassy-nrf-examples/memory.x
+++ b/examples/nrf/memory.x
diff --git a/embassy-nrf-examples/src/bin/blinky.rs b/examples/nrf/src/bin/blinky.rs
index 8f12cfda9..8f12cfda9 100644
--- a/embassy-nrf-examples/src/bin/blinky.rs
+++ b/examples/nrf/src/bin/blinky.rs
diff --git a/embassy-nrf-examples/src/bin/buffered_uart.rs b/examples/nrf/src/bin/buffered_uart.rs
index c800e64fc..c800e64fc 100644
--- a/embassy-nrf-examples/src/bin/buffered_uart.rs
+++ b/examples/nrf/src/bin/buffered_uart.rs
diff --git a/embassy-nrf-examples/src/bin/executor_fairness_test.rs b/examples/nrf/src/bin/executor_fairness_test.rs
index 797be4335..797be4335 100644
--- a/embassy-nrf-examples/src/bin/executor_fairness_test.rs
+++ b/examples/nrf/src/bin/executor_fairness_test.rs
diff --git a/embassy-nrf-examples/src/bin/gpiote_channel.rs b/examples/nrf/src/bin/gpiote_channel.rs
index 9800aed98..9800aed98 100644
--- a/embassy-nrf-examples/src/bin/gpiote_channel.rs
+++ b/examples/nrf/src/bin/gpiote_channel.rs
diff --git a/embassy-nrf-examples/src/bin/gpiote_port.rs b/examples/nrf/src/bin/gpiote_port.rs
index 4a7951cd3..4a7951cd3 100644
--- a/embassy-nrf-examples/src/bin/gpiote_port.rs
+++ b/examples/nrf/src/bin/gpiote_port.rs
diff --git a/embassy-nrf-examples/src/bin/multiprio.rs b/examples/nrf/src/bin/multiprio.rs
index 79fa029b3..79fa029b3 100644
--- a/embassy-nrf-examples/src/bin/multiprio.rs
+++ b/examples/nrf/src/bin/multiprio.rs
diff --git a/embassy-nrf-examples/src/bin/ppi.rs b/examples/nrf/src/bin/ppi.rs
index 717604b9e..717604b9e 100644
--- a/embassy-nrf-examples/src/bin/ppi.rs
+++ b/examples/nrf/src/bin/ppi.rs
diff --git a/embassy-nrf-examples/src/bin/pwm.rs b/examples/nrf/src/bin/pwm.rs
index d2874a29b..d2874a29b 100644
--- a/embassy-nrf-examples/src/bin/pwm.rs
+++ b/examples/nrf/src/bin/pwm.rs
diff --git a/embassy-nrf-examples/src/bin/qspi.rs b/examples/nrf/src/bin/qspi.rs
index 6e49887a4..6e49887a4 100644
--- a/embassy-nrf-examples/src/bin/qspi.rs
+++ b/examples/nrf/src/bin/qspi.rs
diff --git a/embassy-nrf-examples/src/bin/qspi_lowpower.rs b/examples/nrf/src/bin/qspi_lowpower.rs
index ece3243b6..ece3243b6 100644
--- a/embassy-nrf-examples/src/bin/qspi_lowpower.rs
+++ b/examples/nrf/src/bin/qspi_lowpower.rs
diff --git a/embassy-nrf-examples/src/bin/raw_spawn.rs b/examples/nrf/src/bin/raw_spawn.rs
index 78de7b100..78de7b100 100644
--- a/embassy-nrf-examples/src/bin/raw_spawn.rs
+++ b/examples/nrf/src/bin/raw_spawn.rs
diff --git a/embassy-nrf-examples/src/bin/spim.rs b/examples/nrf/src/bin/spim.rs
index c42cc6015..c42cc6015 100644
--- a/embassy-nrf-examples/src/bin/spim.rs
+++ b/examples/nrf/src/bin/spim.rs
diff --git a/embassy-nrf-examples/src/bin/timer.rs b/examples/nrf/src/bin/timer.rs
index 43f6d76ce..43f6d76ce 100644
--- a/embassy-nrf-examples/src/bin/timer.rs
+++ b/examples/nrf/src/bin/timer.rs
diff --git a/embassy-nrf-examples/src/bin/twim.rs b/examples/nrf/src/bin/twim.rs
index 537cea160..537cea160 100644
--- a/embassy-nrf-examples/src/bin/twim.rs
+++ b/examples/nrf/src/bin/twim.rs
diff --git a/embassy-nrf-examples/src/bin/twim_lowpower.rs b/examples/nrf/src/bin/twim_lowpower.rs
index 1cd66a18e..1cd66a18e 100644
--- a/embassy-nrf-examples/src/bin/twim_lowpower.rs
+++ b/examples/nrf/src/bin/twim_lowpower.rs
diff --git a/embassy-nrf-examples/src/bin/uart.rs b/examples/nrf/src/bin/uart.rs
index e65e2fe51..e65e2fe51 100644
--- a/embassy-nrf-examples/src/bin/uart.rs
+++ b/examples/nrf/src/bin/uart.rs
diff --git a/embassy-nrf-examples/src/bin/uart_idle.rs b/examples/nrf/src/bin/uart_idle.rs
index dc2c73433..dc2c73433 100644
--- a/embassy-nrf-examples/src/bin/uart_idle.rs
+++ b/examples/nrf/src/bin/uart_idle.rs
diff --git a/embassy-nrf-examples/src/example_common.rs b/examples/nrf/src/example_common.rs
index 54d633837..54d633837 100644
--- a/embassy-nrf-examples/src/example_common.rs
+++ b/examples/nrf/src/example_common.rs
diff --git a/embassy-rp-examples/.cargo/config.toml b/examples/rp/.cargo/config.toml
index 1bbbe97da..1bbbe97da 100644
--- a/embassy-rp-examples/.cargo/config.toml
+++ b/examples/rp/.cargo/config.toml
diff --git a/embassy-rp-examples/Cargo.toml b/examples/rp/Cargo.toml
index 2cee99bc5..71b48129f 100644
--- a/embassy-rp-examples/Cargo.toml
+++ b/examples/rp/Cargo.toml
@@ -17,8 +17,8 @@ defmt-error = []
 
 
 [dependencies]
-embassy = { version = "0.1.0", path = "../embassy", features = ["defmt", "defmt-trace"] }
-embassy-rp = { version = "0.1.0", path = "../embassy-rp", features = ["defmt", "defmt-trace"] }
+embassy = { version = "0.1.0", path = "../../embassy", features = ["defmt", "defmt-trace"] }
+embassy-rp = { version = "0.1.0", path = "../../embassy-rp", features = ["defmt", "defmt-trace"] }
 rp2040-pac2 = { git = "https://github.com/Dirbaio/rp2040-pac", rev="254f4677937801155ca3cb17c7bb9d38eb62683e" }
 atomic-polyfill = { version = "0.1.1" }
 
diff --git a/embassy-rp-examples/build.rs b/examples/rp/build.rs
index d534cc3df..d534cc3df 100644
--- a/embassy-rp-examples/build.rs
+++ b/examples/rp/build.rs
diff --git a/embassy-rp-examples/memory.x b/examples/rp/memory.x
index aba861aae..aba861aae 100644
--- a/embassy-rp-examples/memory.x
+++ b/examples/rp/memory.x
diff --git a/embassy-rp-examples/src/bin/blinky.rs b/examples/rp/src/bin/blinky.rs
index e42999912..e42999912 100644
--- a/embassy-rp-examples/src/bin/blinky.rs
+++ b/examples/rp/src/bin/blinky.rs
diff --git a/embassy-rp-examples/src/bin/button.rs b/examples/rp/src/bin/button.rs
index c4d942ff5..c4d942ff5 100644
--- a/embassy-rp-examples/src/bin/button.rs
+++ b/examples/rp/src/bin/button.rs
diff --git a/embassy-rp-examples/src/bin/uart.rs b/examples/rp/src/bin/uart.rs
index 8b5f2a53b..8b5f2a53b 100644
--- a/embassy-rp-examples/src/bin/uart.rs
+++ b/examples/rp/src/bin/uart.rs
diff --git a/embassy-rp-examples/src/example_common.rs b/examples/rp/src/example_common.rs
index f7c4ef57a..f7c4ef57a 100644
--- a/embassy-rp-examples/src/example_common.rs
+++ b/examples/rp/src/example_common.rs
diff --git a/examples/std/Cargo.toml b/examples/std/Cargo.toml
new file mode 100644
index 000000000..04e89269d
--- /dev/null
+++ b/examples/std/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+authors = ["Dario Nieuwenhuis <[email protected]>"]
+edition = "2018"
+name = "embassy-std-examples"
+version = "0.1.0"
+
+[dependencies]
+embassy = { version = "0.1.0", path = "../../embassy", features = ["log"] }
+embassy-std = { version = "0.1.0", path = "../../embassy-std" }
+embassy-net = { version = "0.1.0", path = "../../embassy-net", features=["std", "log", "medium-ethernet", "tcp", "dhcpv4"] }
+smoltcp = { git = "https://github.com/smoltcp-rs/smoltcp", rev="ec59aba5e10cf91df0c9253d9c2aca4dd143d2ff", default-features = false }
+
+async-io = "1.3.1"
+env_logger = "0.8.2"
+futures = { version = "0.3.8", default-features = false, features = ["async-await"] }
+log = "0.4.11"
+nix = "0.21.0"
+libc = "0.2.81"
+clap = { version = "3.0.0-beta.2", features = ["derive"] }
+rand_core   = { version = "0.6.0", features = ["std"] }
+heapless            = { version = "0.5.6", default-features = false } 
diff --git a/examples/std/src/bin/net.rs b/examples/std/src/bin/net.rs
new file mode 100644
index 000000000..5a726e5d2
--- /dev/null
+++ b/examples/std/src/bin/net.rs
@@ -0,0 +1,103 @@
+#![feature(type_alias_impl_trait)]
+#![feature(min_type_alias_impl_trait)]
+#![feature(impl_trait_in_bindings)]
+#![allow(incomplete_features)]
+
+use clap::{AppSettings, Clap};
+use embassy::executor::Spawner;
+use embassy::io::AsyncWriteExt;
+use embassy::util::Forever;
+use embassy_net::*;
+use embassy_std::Executor;
+use heapless::Vec;
+use log::*;
+
+#[path = "../tuntap.rs"]
+mod tuntap;
+
+use crate::tuntap::TunTapDevice;
+
+static DEVICE: Forever<TunTapDevice> = Forever::new();
+static CONFIG: Forever<DhcpConfigurator> = Forever::new();
+
+#[derive(Clap)]
+#[clap(version = "1.0")]
+#[clap(setting = AppSettings::ColoredHelp)]
+struct Opts {
+    /// TAP device name
+    #[clap(long, default_value = "tap0")]
+    tap: String,
+}
+
+#[embassy::task]
+async fn net_task() {
+    embassy_net::run().await
+}
+
+#[embassy::task]
+async fn main_task(spawner: Spawner) {
+    let opts: Opts = Opts::parse();
+
+    // Init network device
+    let device = TunTapDevice::new(&opts.tap).unwrap();
+
+    // Static IP configuration
+    let config = StaticConfigurator::new(Config {
+        address: Ipv4Cidr::new(Ipv4Address::new(192, 168, 69, 2), 24),
+        dns_servers: Vec::new(),
+        gateway: Some(Ipv4Address::new(192, 168, 69, 1)),
+    });
+
+    // DHCP configruation
+    let config = DhcpConfigurator::new();
+
+    // Init network stack
+    embassy_net::init(DEVICE.put(device), CONFIG.put(config));
+
+    // Launch network task
+    spawner.spawn(net_task()).unwrap();
+
+    // Then we can use it!
+    let mut rx_buffer = [0; 4096];
+    let mut tx_buffer = [0; 4096];
+    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, 69, 74), 8000);
+    info!("connecting to {:?}...", remote_endpoint);
+    let r = socket.connect(remote_endpoint).await;
+    if let Err(e) = r {
+        warn!("connect error: {:?}", e);
+        return;
+    }
+    info!("connected!");
+    loop {
+        let r = socket.write_all(b"Hello!\n").await;
+        if let Err(e) = r {
+            warn!("write error: {:?}", e);
+            return;
+        }
+    }
+}
+
+#[no_mangle]
+fn _embassy_rand(buf: &mut [u8]) {
+    use rand_core::{OsRng, RngCore};
+    OsRng.fill_bytes(buf);
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+fn main() {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Debug)
+        .filter_module("async_io", log::LevelFilter::Info)
+        .format_timestamp_nanos()
+        .init();
+
+    let executor = EXECUTOR.put(Executor::new());
+    executor.run(|spawner| {
+        spawner.spawn(main_task(spawner)).unwrap();
+    });
+}
diff --git a/embassy-std-examples/src/bin/serial.rs b/examples/std/src/bin/serial.rs
index 1b22dc0de..1b22dc0de 100644
--- a/embassy-std-examples/src/bin/serial.rs
+++ b/examples/std/src/bin/serial.rs
diff --git a/embassy-std-examples/src/bin/tick.rs b/examples/std/src/bin/tick.rs
index 6f30edb34..6f30edb34 100644
--- a/embassy-std-examples/src/bin/tick.rs
+++ b/examples/std/src/bin/tick.rs
diff --git a/embassy-std-examples/src/serial_port.rs b/examples/std/src/serial_port.rs
index 7ac1b1edb..7ac1b1edb 100644
--- a/embassy-std-examples/src/serial_port.rs
+++ b/examples/std/src/serial_port.rs
diff --git a/examples/std/src/tuntap.rs b/examples/std/src/tuntap.rs
new file mode 100644
index 000000000..dd453deb3
--- /dev/null
+++ b/examples/std/src/tuntap.rs
@@ -0,0 +1,225 @@
+use async_io::Async;
+use libc;
+use log::*;
+use smoltcp::wire::EthernetFrame;
+use std::io;
+use std::io::{Read, Write};
+use std::os::unix::io::{AsRawFd, RawFd};
+
+pub const SIOCGIFMTU: libc::c_ulong = 0x8921;
+pub const SIOCGIFINDEX: libc::c_ulong = 0x8933;
+pub const ETH_P_ALL: libc::c_short = 0x0003;
+pub const TUNSETIFF: libc::c_ulong = 0x400454CA;
+pub const IFF_TUN: libc::c_int = 0x0001;
+pub const IFF_TAP: libc::c_int = 0x0002;
+pub const IFF_NO_PI: libc::c_int = 0x1000;
+
+#[repr(C)]
+#[derive(Debug)]
+struct ifreq {
+    ifr_name: [libc::c_char; libc::IF_NAMESIZE],
+    ifr_data: libc::c_int, /* ifr_ifindex or ifr_mtu */
+}
+
+fn ifreq_for(name: &str) -> ifreq {
+    let mut ifreq = ifreq {
+        ifr_name: [0; libc::IF_NAMESIZE],
+        ifr_data: 0,
+    };
+    for (i, byte) in name.as_bytes().iter().enumerate() {
+        ifreq.ifr_name[i] = *byte as libc::c_char
+    }
+    ifreq
+}
+
+fn ifreq_ioctl(
+    lower: libc::c_int,
+    ifreq: &mut ifreq,
+    cmd: libc::c_ulong,
+) -> io::Result<libc::c_int> {
+    unsafe {
+        let res = libc::ioctl(lower, cmd as _, ifreq as *mut ifreq);
+        if res == -1 {
+            return Err(io::Error::last_os_error());
+        }
+    }
+
+    Ok(ifreq.ifr_data)
+}
+
+#[derive(Debug)]
+pub struct TunTap {
+    fd: libc::c_int,
+    ifreq: ifreq,
+    mtu: usize,
+}
+
+impl AsRawFd for TunTap {
+    fn as_raw_fd(&self) -> RawFd {
+        self.fd
+    }
+}
+
+impl TunTap {
+    pub fn new(name: &str) -> io::Result<TunTap> {
+        unsafe {
+            let fd = libc::open(
+                "/dev/net/tun\0".as_ptr() as *const libc::c_char,
+                libc::O_RDWR | libc::O_NONBLOCK,
+            );
+            if fd == -1 {
+                return Err(io::Error::last_os_error());
+            }
+
+            let mut ifreq = ifreq_for(name);
+            ifreq.ifr_data = IFF_TAP | IFF_NO_PI;
+            ifreq_ioctl(fd, &mut ifreq, TUNSETIFF)?;
+
+            let socket = libc::socket(libc::AF_INET, libc::SOCK_DGRAM, libc::IPPROTO_IP);
+            if socket == -1 {
+                return Err(io::Error::last_os_error());
+            }
+
+            let ip_mtu = ifreq_ioctl(socket, &mut ifreq, SIOCGIFMTU);
+            libc::close(socket);
+            let ip_mtu = ip_mtu? as usize;
+
+            // SIOCGIFMTU returns the IP MTU (typically 1500 bytes.)
+            // smoltcp counts the entire Ethernet packet in the MTU, so add the Ethernet header size to it.
+            let mtu = ip_mtu + EthernetFrame::<&[u8]>::header_len();
+
+            Ok(TunTap { fd, mtu, ifreq })
+        }
+    }
+}
+
+impl Drop for TunTap {
+    fn drop(&mut self) {
+        unsafe {
+            libc::close(self.fd);
+        }
+    }
+}
+
+impl io::Read for TunTap {
+    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+        let len = unsafe { libc::read(self.fd, buf.as_mut_ptr() as *mut libc::c_void, buf.len()) };
+        if len == -1 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(len as usize)
+        }
+    }
+}
+
+impl io::Write for TunTap {
+    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        let len = unsafe { libc::write(self.fd, buf.as_ptr() as *mut libc::c_void, buf.len()) };
+        if len == -1 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(len as usize)
+        }
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+pub struct TunTapDevice {
+    device: Async<TunTap>,
+    waker: Option<Waker>,
+}
+
+impl TunTapDevice {
+    pub fn new(name: &str) -> io::Result<TunTapDevice> {
+        Ok(Self {
+            device: Async::new(TunTap::new(name)?)?,
+            waker: None,
+        })
+    }
+}
+
+use core::task::Waker;
+use embassy_net::{DeviceCapabilities, LinkState, Packet, PacketBox, PacketBoxExt, PacketBuf};
+use std::task::Context;
+
+impl crate::Device for TunTapDevice {
+    fn is_transmit_ready(&mut self) -> bool {
+        true
+    }
+
+    fn transmit(&mut self, pkt: PacketBuf) {
+        // todo handle WouldBlock
+        match self.device.get_mut().write(&pkt) {
+            Ok(_) => {}
+            Err(e) if e.kind() == io::ErrorKind::WouldBlock => {
+                info!("transmit WouldBlock");
+            }
+            Err(e) => panic!("transmit error: {:?}", e),
+        }
+    }
+
+    fn receive(&mut self) -> Option<PacketBuf> {
+        let mut pkt = PacketBox::new(Packet::new()).unwrap();
+        loop {
+            match self.device.get_mut().read(&mut pkt[..]) {
+                Ok(n) => {
+                    return Some(pkt.slice(0..n));
+                }
+                Err(e) if e.kind() == io::ErrorKind::WouldBlock => {
+                    let ready = if let Some(w) = self.waker.as_ref() {
+                        let mut cx = Context::from_waker(w);
+                        let ready = self.device.poll_readable(&mut cx).is_ready();
+                        ready
+                    } else {
+                        false
+                    };
+                    if !ready {
+                        return None;
+                    }
+                }
+                Err(e) => panic!("read error: {:?}", e),
+            }
+        }
+    }
+
+    fn register_waker(&mut self, w: &Waker) {
+        match self.waker {
+            // Optimization: If both the old and new Wakers wake the same task, we can simply
+            // keep the old waker, skipping the clone. (In most executor implementations,
+            // cloning a waker is somewhat expensive, comparable to cloning an Arc).
+            Some(ref w2) if (w2.will_wake(w)) => {}
+            _ => {
+                // clone the new waker and store it
+                if let Some(old_waker) = core::mem::replace(&mut self.waker, Some(w.clone())) {
+                    // We had a waker registered for another task. Wake it, so the other task can
+                    // reregister itself if it's still interested.
+                    //
+                    // If two tasks are waiting on the same thing concurrently, this will cause them
+                    // to wake each other in a loop fighting over this WakerRegistration. This wastes
+                    // CPU but things will still work.
+                    //
+                    // If the user wants to have two tasks waiting on the same thing they should use
+                    // a more appropriate primitive that can store multiple wakers.
+                    old_waker.wake()
+                }
+            }
+        }
+    }
+
+    fn capabilities(&mut self) -> DeviceCapabilities {
+        let mut caps = DeviceCapabilities::default();
+        caps.max_transmission_unit = self.device.get_ref().mtu;
+        caps
+    }
+
+    fn link_state(&mut self) -> LinkState {
+        LinkState::Up
+    }
+
+    fn ethernet_address(&mut self) -> [u8; 6] {
+        [0x02, 0x03, 0x04, 0x05, 0x06, 0x07]
+    }
+}
diff --git a/embassy-stm32-examples/.cargo/config.toml b/examples/stm32f4/.cargo/config.toml
index 8704a9ba5..8704a9ba5 100644
--- a/embassy-stm32-examples/.cargo/config.toml
+++ b/examples/stm32f4/.cargo/config.toml
diff --git a/embassy-stm32-examples/Cargo.toml b/examples/stm32f4/Cargo.toml
index 799f0f9b9..c5c8d9ae6 100644
--- a/embassy-stm32-examples/Cargo.toml
+++ b/examples/stm32f4/Cargo.toml
@@ -17,10 +17,10 @@ defmt-warn = []
 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", "stm32f429zi"]  }
-embassy-extras = {version = "0.1.0", path = "../embassy-extras" }
+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", "stm32f429zi"]  }
+embassy-extras = {version = "0.1.0", path = "../../embassy-extras" }
 stm32f4 = { version = "0.13", features = ["stm32f429"] }
 
 defmt = "0.2.0"
diff --git a/embassy-stm32-examples/build.rs b/examples/stm32f4/build.rs
index d534cc3df..d534cc3df 100644
--- a/embassy-stm32-examples/build.rs
+++ b/examples/stm32f4/build.rs
diff --git a/embassy-stm32-examples/memory.x b/examples/stm32f4/memory.x
index f21e32572..f21e32572 100644
--- a/embassy-stm32-examples/memory.x
+++ b/examples/stm32f4/memory.x
diff --git a/embassy-stm32-examples/src/bin/blinky.rs b/examples/stm32f4/src/bin/blinky.rs
index 7590764d8..7590764d8 100644
--- a/embassy-stm32-examples/src/bin/blinky.rs
+++ b/examples/stm32f4/src/bin/blinky.rs
diff --git a/embassy-stm32-examples/src/bin/button.rs b/examples/stm32f4/src/bin/button.rs
index 1ee99f527..1ee99f527 100644
--- a/embassy-stm32-examples/src/bin/button.rs
+++ b/examples/stm32f4/src/bin/button.rs
diff --git a/embassy-stm32-examples/src/bin/button_exti.rs b/examples/stm32f4/src/bin/button_exti.rs
index 8fc889dad..8fc889dad 100644
--- a/embassy-stm32-examples/src/bin/button_exti.rs
+++ b/examples/stm32f4/src/bin/button_exti.rs
diff --git a/embassy-stm32-examples/src/bin/spi.rs b/examples/stm32f4/src/bin/spi.rs
index af0d57412..af0d57412 100644
--- a/embassy-stm32-examples/src/bin/spi.rs
+++ b/examples/stm32f4/src/bin/spi.rs
diff --git a/embassy-stm32-examples/src/bin/usart.rs b/examples/stm32f4/src/bin/usart.rs
index f7b66f86b..f7b66f86b 100644
--- a/embassy-stm32-examples/src/bin/usart.rs
+++ b/examples/stm32f4/src/bin/usart.rs
diff --git a/embassy-stm32-examples/src/bin/usart_dma.rs b/examples/stm32f4/src/bin/usart_dma.rs
index fae05b607..fae05b607 100644
--- a/embassy-stm32-examples/src/bin/usart_dma.rs
+++ b/examples/stm32f4/src/bin/usart_dma.rs
diff --git a/embassy-stm32-examples/src/example_common.rs b/examples/stm32f4/src/example_common.rs
index 54d633837..54d633837 100644
--- a/embassy-stm32-examples/src/example_common.rs
+++ b/examples/stm32f4/src/example_common.rs