diff --git a/Cargo.lock b/Cargo.lock
index 9960b5dd5..a0134424a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,6 +17,27 @@ version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
+[[package]]
+name = "as-slice"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45403b49e3954a4b8428a0ac21a4b7afadccf92bfd96273f1a58cd4812496ae0"
+dependencies = [
+ "generic-array 0.12.4",
+ "generic-array 0.13.3",
+ "generic-array 0.14.7",
+ "stable_deref_trait",
+]
+
+[[package]]
+name = "as-slice"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "516b6b4f0e40d50dcda9365d53964ec74560ad4284da2e7fc97122cd83174516"
+dependencies = [
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "ascii-canvas"
 version = "3.0.0"
@@ -44,6 +65,18 @@ dependencies = [
  "critical-section",
 ]
 
+[[package]]
+name = "atomic-pool"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "58c5fc22e05ec2884db458bf307dc7b278c9428888d2b6e6fad9c0ae7804f5f6"
+dependencies = [
+ "as-slice 0.1.5",
+ "as-slice 0.2.1",
+ "atomic-polyfill 1.0.3",
+ "stable_deref_trait",
+]
+
 [[package]]
 name = "atty"
 version = "0.2.14"
@@ -151,7 +184,7 @@ version = "0.10.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3078c7629b62d3f0439517fa394996acacc5cbc91c5a20d8c658e77abd503a71"
 dependencies = [
- "generic-array",
+ "generic-array 0.14.7",
 ]
 
 [[package]]
@@ -356,12 +389,13 @@ checksum = "7cc888e15f6be910b58fda4f056f673f58fb9348ea45da014283a14e6d2b58ec"
 [[package]]
 name = "coap-message-demos"
 version = "0.3.0"
-source = "git+https://gitlab.com/chrysn/coap-message-demos/#eb1b6ce4c72269b68e6be8ca758d3379d1e59258"
+source = "git+https://gitlab.com/chrysn/coap-message-demos/#9a42ab5353bb27a69bdab446b0cf183a74b11ead"
 dependencies = [
  "coap-handler",
  "coap-handler-implementations 0.4.2",
  "coap-message",
  "coap-numbers",
+ "coap-request",
  "heapless 0.7.16",
  "serde",
 ]
@@ -372,6 +406,15 @@ version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e766be4563107bc11c281c017ab922c3f3079345c9aa0fe747b4f9abc13411ac"
 
+[[package]]
+name = "coap-request"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32bc3e68c615d724b3b397ac2408b4dea533da85ada6b0fb4149034e5d5aae9d"
+dependencies = [
+ "coap-message",
+]
+
 [[package]]
 name = "codespan-reporting"
 version = "0.11.1"
@@ -483,7 +526,7 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1bfb12502f3fc46cca1bb51ac28df9d618d813cdc3d2f25b9fe775a34af26bb3"
 dependencies = [
- "generic-array",
+ "generic-array 0.14.7",
  "typenum",
 ]
 
@@ -611,7 +654,7 @@ dependencies = [
 [[package]]
 name = "embassy-embedded-hal"
 version = "0.1.0"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
  "embassy-futures",
  "embassy-sync 0.4.0",
@@ -626,10 +669,9 @@ dependencies = [
 
 [[package]]
 name = "embassy-executor"
-version = "0.3.2"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+version = "0.3.3"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
- "atomic-polyfill 1.0.3",
  "cortex-m",
  "critical-section",
  "embassy-macros",
@@ -639,7 +681,7 @@ dependencies = [
 [[package]]
 name = "embassy-futures"
 version = "0.1.1"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 
 [[package]]
 name = "embassy-gpio"
@@ -655,7 +697,7 @@ dependencies = [
 [[package]]
 name = "embassy-hal-internal"
 version = "0.1.0"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
  "cortex-m",
  "critical-section",
@@ -665,7 +707,7 @@ dependencies = [
 [[package]]
 name = "embassy-macros"
 version = "0.2.1"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
  "darling",
  "proc-macro2",
@@ -673,10 +715,54 @@ dependencies = [
  "syn 2.0.39",
 ]
 
+[[package]]
+name = "embassy-net"
+version = "0.1.0"
+dependencies = [
+ "embassy-executor",
+ "embassy-sync 0.3.0",
+ "embassy-time",
+ "riot-rs",
+ "riot-rs-boards",
+]
+
+[[package]]
+name = "embassy-net"
+version = "0.2.1"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
+dependencies = [
+ "as-slice 0.2.1",
+ "atomic-pool",
+ "embassy-net-driver",
+ "embassy-sync 0.4.0",
+ "embassy-time",
+ "futures",
+ "generic-array 0.14.7",
+ "heapless 0.8.0",
+ "managed",
+ "smoltcp",
+ "stable_deref_trait",
+]
+
+[[package]]
+name = "embassy-net-driver"
+version = "0.2.0"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
+
+[[package]]
+name = "embassy-net-driver-channel"
+version = "0.2.0"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
+dependencies = [
+ "embassy-futures",
+ "embassy-net-driver",
+ "embassy-sync 0.4.0",
+]
+
 [[package]]
 name = "embassy-nrf"
 version = "0.1.0"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
  "cfg-if",
  "cortex-m",
@@ -686,9 +772,14 @@ dependencies = [
  "embassy-hal-internal",
  "embassy-sync 0.4.0",
  "embassy-time",
+ "embassy-usb-driver",
  "embedded-hal 0.2.7",
+ "embedded-hal 1.0.0-rc.1",
+ "embedded-hal-async",
  "embedded-io 0.6.1",
+ "embedded-io-async",
  "embedded-storage",
+ "embedded-storage-async",
  "fixed",
  "nrf52805-pac",
  "nrf52810-pac",
@@ -706,7 +797,7 @@ dependencies = [
 [[package]]
 name = "embassy-rp"
 version = "0.1.0"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
  "atomic-polyfill 1.0.3",
  "cfg-if",
@@ -751,7 +842,7 @@ dependencies = [
 [[package]]
 name = "embassy-sync"
 version = "0.4.0"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
  "cfg-if",
  "critical-section",
@@ -762,7 +853,7 @@ dependencies = [
 [[package]]
 name = "embassy-time"
 version = "0.1.5"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 dependencies = [
  "cfg-if",
  "critical-section",
@@ -773,10 +864,22 @@ dependencies = [
  "heapless 0.8.0",
 ]
 
+[[package]]
+name = "embassy-usb"
+version = "0.1.0"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
+dependencies = [
+ "embassy-futures",
+ "embassy-net-driver-channel",
+ "embassy-sync 0.4.0",
+ "embassy-usb-driver",
+ "heapless 0.8.0",
+]
+
 [[package]]
 name = "embassy-usb-driver"
 version = "0.1.0"
-source = "git+https://github.com/embassy-rs/embassy#7e5deae58943e886d3879b29f752e4ebdee71195"
+source = "git+https://github.com/embassy-rs/embassy#006260feddf4d362a99260a38d86dffddab39d2e"
 
 [[package]]
 name = "embedded-dma"
@@ -874,9 +977,9 @@ checksum = "5443807d6dff69373d433ab9ef5378ad8df50ca6298caf15de6e52e24aaf54d5"
 
 [[package]]
 name = "errno"
-version = "0.3.6"
+version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7c18ee0ed65a5f1f81cac6b1d213b69c35fa47d4252ad41f1486dbd8226fe36e"
+checksum = "f258a7194e7f7c2a7837a8913aeab7fd8c383457034fa20ce4dd3dcb813e8eb8"
 dependencies = [
  "libc",
  "windows-sys",
@@ -1000,6 +1103,24 @@ version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1d758ba1b47b00caf47f24925c0074ecb20d6dfcffe7f6d53395c0465674841a"
 
+[[package]]
+name = "generic-array"
+version = "0.12.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffdf9f34f1447443d37393cc6c2b8313aebddcd96906caf34e54c68d8e57d7bd"
+dependencies = [
+ "typenum",
+]
+
+[[package]]
+name = "generic-array"
+version = "0.13.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f797e67af32588215eaaab8327027ee8e71b9dd0b2b26996aedf20c030fce309"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "generic-array"
 version = "0.14.7"
@@ -1319,6 +1440,12 @@ version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5e6163cb8c49088c2c36f57875e58ccd8c87c7427f7fbd50ea6710b2f3f2e8f"
 
+[[package]]
+name = "managed"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ca88d725a0a943b096803bd34e73a4437208b6077654cc4ecb2947a5f91618d"
+
 [[package]]
 name = "memchr"
 version = "2.6.4"
@@ -1739,6 +1866,15 @@ dependencies = [
  "syn 1.0.109",
 ]
 
+[[package]]
+name = "portable-atomic"
+version = "1.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bccab0e7fd7cc19f820a1c8c91720af652d0c88dc9664dd72aef2614f04af3b"
+dependencies = [
+ "critical-section",
+]
+
 [[package]]
 name = "precomputed-hash"
 version = "0.1.1"
@@ -1975,13 +2111,17 @@ version = "0.1.0"
 dependencies = [
  "critical-section",
  "embassy-executor",
+ "embassy-net 0.2.1",
  "embassy-nrf",
  "embassy-rp",
  "embassy-sync 0.3.0",
  "embassy-time",
+ "embassy-usb",
+ "heapless 0.8.0",
  "linkme",
  "riot-rs-core",
  "riot-rs-rt",
+ "static_cell",
 ]
 
 [[package]]
@@ -2000,6 +2140,7 @@ dependencies = [
  "cortex-m-rt",
  "cortex-m-semihosting",
  "linkme",
+ "portable-atomic",
  "riot-rs-boards",
  "riot-rs-threads",
  "rtt-target",
@@ -2171,9 +2312,9 @@ dependencies = [
 
 [[package]]
 name = "rustix"
-version = "0.38.22"
+version = "0.38.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "80109a168d9bc0c7f483083244543a6eb0dba02295d33ca268145e6190d6df0c"
+checksum = "9ad981d6c340a49cdc40a1028d9c6084ec7e9fa33fcb839cab656a267071e234"
 dependencies = [
  "bitflags 2.4.1",
  "errno",
@@ -2295,6 +2436,18 @@ version = "1.11.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4dccd0940a2dcdf68d092b8cbab7dc0ad8fa938bf95787e1b916b0e3d0e8e970"
 
+[[package]]
+name = "smoltcp"
+version = "0.10.0"
+source = "git+https://github.com/smoltcp-rs/smoltcp.git?rev=b57e2f9e70e82a13f31d5ea17e55232c11cc2b2d#b57e2f9e70e82a13f31d5ea17e55232c11cc2b2d"
+dependencies = [
+ "bitflags 1.3.2",
+ "byteorder",
+ "cfg-if",
+ "heapless 0.8.0",
+ "managed",
+]
+
 [[package]]
 name = "spin"
 version = "0.9.8"
@@ -2310,6 +2463,15 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
+[[package]]
+name = "static_cell"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa6ba4cf83bf80d3eb25f098ea5e790a0a1fcb5e357442259b231e412c2d3ca0"
+dependencies = [
+ "portable-atomic",
+]
+
 [[package]]
 name = "stm32f4"
 version = "0.14.0"
diff --git a/Cargo.toml b/Cargo.toml
index cf99463bd..aee568937 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,10 +31,12 @@ cortex-m-semihosting = { version = "0.5" }
 critical-section = { version = "1.1.2" }
 
 embassy-executor = { version = "0.3.2", default-features = false }
+embassy-net = { version = "0.2.1", default-features = false }
 embassy-nrf = { version = "0.1.0", default-features = false }
 embassy-rp = { version = "0.1.0", default-features = false }
 embassy-sync = { version = "0.3.0", default-features = false }
 embassy-time = { version = "0.1.5", default-features = false }
+embassy-usb = { version = "0.1.0", default-features = false }
 
 linkme = { version = "0.3.17", features = ["used_linker"] }
 
@@ -46,6 +48,7 @@ riot-wrappers = { version = "^0.8", default-features = false, features = [
   "with_riot_rs",
 ] }
 
+static_cell = { version = "2.0.0", features = [ "nightly" ] }
 ld-memory = { version = "0.2.9" }
 
 [profile.dev]
@@ -78,7 +81,9 @@ nrf52840-pac = { git = "https://github.com/kaspar030/nrf-pacs", branch = "riot-r
 nrf52832-pac = { git = "https://github.com/kaspar030/nrf-pacs", branch = "riot-rs" }
 embassy-macros = { git = "https://github.com/embassy-rs/embassy"}
 embassy-executor = { git = "https://github.com/embassy-rs/embassy"}
+embassy-net = { git = "https://github.com/embassy-rs/embassy"}
 embassy-nrf = { git = "https://github.com/embassy-rs/embassy"}
 embassy-rp = { git = "https://github.com/embassy-rs/embassy"}
 embassy-time = { git = "https://github.com/embassy-rs/embassy"}
 embassy-sync = { git = "https://github.com/embassy-rs/embassy"}
+embassy-usb = { git = "https://github.com/embassy-rs/embassy"}
diff --git a/examples/embassy-net/Cargo.toml b/examples/embassy-net/Cargo.toml
new file mode 100644
index 000000000..5906ebf4b
--- /dev/null
+++ b/examples/embassy-net/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "embassy-net"
+version = "0.1.0"
+authors.workspace = true
+edition.workspace = true
+publish = false
+
+[dependencies]
+riot-rs = { path = "../../src/riot-rs", features = [ "time", "usb_ethernet"] }
+riot-rs-boards = { path = "../../src/riot-rs-boards" }
+embassy-executor = { workspace = true, default-features = false }
+embassy-time = { workspace = true, default-features = false }
+embassy-sync = { workspace = true, default-features = false }
diff --git a/examples/embassy-net/README.md b/examples/embassy-net/README.md
new file mode 100644
index 000000000..3b52a8c9a
--- /dev/null
+++ b/examples/embassy-net/README.md
@@ -0,0 +1,15 @@
+# embassy-net
+
+## About
+
+This application is testing basic
+[embassy](https://github.com/embassy-rs/embassy) _networking_ usage with RIOT-rs.
+
+## How to run
+
+In this folder, run
+
+    laze build -b nrf52840dk run
+
+With the device USB cable connected, a USB ethernet device should pop up.
+RIOT-rs will reply to ping requests on 10.0.42.61.
diff --git a/examples/embassy-net/laze.yml b/examples/embassy-net/laze.yml
new file mode 100644
index 000000000..88f90e2bd
--- /dev/null
+++ b/examples/embassy-net/laze.yml
@@ -0,0 +1,4 @@
+apps:
+  - name: embassy-net
+    selects:
+      - ?release
diff --git a/examples/embassy-net/src/main.rs b/examples/embassy-net/src/main.rs
new file mode 100644
index 000000000..67a6d990e
--- /dev/null
+++ b/examples/embassy-net/src/main.rs
@@ -0,0 +1,48 @@
+#![no_main]
+#![no_std]
+#![feature(type_alias_impl_trait)]
+
+use riot_rs as _;
+
+use riot_rs::rt::debug::println;
+
+use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, signal::Signal};
+use riot_rs::embassy::{blocker, EXECUTOR};
+
+static SIGNAL: Signal<CriticalSectionRawMutex, u32> = Signal::new();
+
+#[embassy_executor::task]
+async fn async_task() {
+    use embassy_time::{Duration, Timer, TICK_HZ};
+    let mut counter = 0u32;
+    loop {
+        if counter % 2 == 0 {
+            println!("async_task() signalling");
+            SIGNAL.signal(counter);
+        } else {
+            println!("async_task()");
+        }
+        Timer::after(Duration::from_ticks(TICK_HZ / 10)).await;
+        counter += 1;
+    }
+}
+
+#[no_mangle]
+fn riot_main() {
+    println!(
+        "Hello from riot_main()! Running on a {} board.",
+        riot_rs::buildinfo::BOARD
+    );
+
+    let spawner = EXECUTOR.spawner();
+    spawner.spawn(async_task()).unwrap();
+
+    loop {
+        let val = blocker::block_on(SIGNAL.wait());
+        println!(
+            "now={}ms threadtest() val={}",
+            Instant::now().as_millis(),
+            val
+        );
+    }
+}
diff --git a/examples/laze.yml b/examples/laze.yml
index 24e094a22..a730814cd 100644
--- a/examples/laze.yml
+++ b/examples/laze.yml
@@ -8,6 +8,7 @@ subdirs:
   - bottles
   - core-sizes
   - embassy
+  - embassy-net
     #  - embassy-gpio
   - hello-world
   - minimal
diff --git a/src/riot-rs-embassy/Cargo.toml b/src/riot-rs-embassy/Cargo.toml
index 1137ca491..ed9022393 100644
--- a/src/riot-rs-embassy/Cargo.toml
+++ b/src/riot-rs-embassy/Cargo.toml
@@ -6,10 +6,11 @@ edition = "2021"
 [dependencies]
 # always
 linkme.workspace = true
+static_cell.workspace = true
+critical-section.workspace = true
 embassy-sync = { workspace = true }
 riot-rs-core = { path = "../riot-rs-core" }
 riot-rs-rt = { path = "../riot-rs-rt" }
-critical-section.workspace = true
 
 # time
 embassy-time = { workspace = true, optional = true, features = [
@@ -17,6 +18,10 @@ embassy-time = { workspace = true, optional = true, features = [
   "unstable-traits",
 ] }
 
+embassy-usb = { workspace = true, optional = true }
+embassy-net = { workspace = true, optional = true, features = [ "dhcpv4", "medium-ethernet" ] }
+heapless = "0.8.0"
+
 [target.'cfg(context = "cortex-m")'.dependencies]
 embassy-executor = { workspace = true, features = [
   "arch-cortex-m",
@@ -26,6 +31,7 @@ embassy-executor = { workspace = true, features = [
 
 [target.'cfg(context = "nrf52")'.dependencies]
 embassy-nrf = { workspace = true, features = [
+  "nightly",
   "time-driver-rtc1",
   "time",
   "unstable-pac",
@@ -53,3 +59,6 @@ embassy-rp = { workspace = true, features = [
 
 [features]
 time = ["dep:embassy-time", "embassy-executor/integrated-timers"]
+usb = [ "dep:embassy-usb" ]
+net = [ "dep:embassy-net" ]
+usb_ethernet = [ "usb", "net" ]
diff --git a/src/riot-rs-embassy/src/lib.rs b/src/riot-rs-embassy/src/lib.rs
index 29d2414af..0ee6a0dd6 100644
--- a/src/riot-rs-embassy/src/lib.rs
+++ b/src/riot-rs-embassy/src/lib.rs
@@ -2,59 +2,263 @@
 #![feature(type_alias_impl_trait)]
 #![feature(used_with_arg)]
 
-use embassy_executor::InterruptExecutor;
+use embassy_executor::{InterruptExecutor, Spawner};
+use static_cell::make_static;
 
-pub static EXECUTOR: InterruptExecutor = InterruptExecutor::new();
+#[cfg(feature = "usb")]
+use embassy_usb::{Builder, UsbDevice};
 
 pub mod blocker;
 
+pub static EXECUTOR: InterruptExecutor = InterruptExecutor::new();
+
 #[cfg(context = "nrf52")]
-use embassy_nrf as embassy_arch;
-#[cfg(context = "nrf52")]
-use embassy_nrf::interrupt::SWI0_EGU0 as SWI;
+mod nrf52 {
+    pub use embassy_nrf::interrupt;
+    pub use embassy_nrf::interrupt::SWI0_EGU0 as SWI;
+    pub use embassy_nrf::{init, Peripherals};
+
+    #[cfg(feature = "usb")]
+    use embassy_nrf::{bind_interrupts, peripherals, rng, usb as nrf_usb};
+
+    #[cfg(feature = "usb")]
+    bind_interrupts!(struct Irqs {
+        USBD => nrf_usb::InterruptHandler<peripherals::USBD>;
+        POWER_CLOCK => nrf_usb::vbus_detect::InterruptHandler;
+        RNG => rng::InterruptHandler<peripherals::RNG>;
+    });
+
+    #[interrupt]
+    unsafe fn SWI0_EGU0() {
+        crate::EXECUTOR.on_interrupt()
+    }
+
+    #[cfg(feature = "usb")]
+    pub mod usb {
+        use embassy_nrf::peripherals;
+        use embassy_nrf::usb::{vbus_detect::HardwareVbusDetect, Driver};
+        pub type UsbDriver = Driver<'static, peripherals::USBD, HardwareVbusDetect>;
+        pub fn driver(usbd: peripherals::USBD) -> UsbDriver {
+            use super::Irqs;
+            Driver::new(usbd, Irqs, HardwareVbusDetect::new(Irqs))
+        }
+    }
+}
 
 #[cfg(context = "rp2040")]
-use embassy_rp as embassy_arch;
-#[cfg(context = "rp2040")]
-use embassy_rp::interrupt::SWI_IRQ_1 as SWI;
+mod rp2040 {
+    pub use embassy_rp::interrupt;
+    pub use embassy_rp::interrupt::SWI_IRQ_1 as SWI;
+    pub use embassy_rp::{init, Peripherals};
 
-use embassy_arch::interrupt;
+    #[cfg(feature = "usb")]
+    use embassy_rp::{
+        bind_interrupts, peripherals,
+        peripherals::USB,
+        usb::{Driver, InterruptHandler},
+    };
 
-#[cfg(context = "nrf52")]
-#[interrupt]
-unsafe fn SWI0_EGU0() {
-    EXECUTOR.on_interrupt()
+    // rp2040 usb start
+    #[cfg(feature = "usb")]
+    bind_interrupts!(struct Irqs {
+        USBCTRL_IRQ => InterruptHandler<USB>;
+    });
+
+    #[interrupt]
+    unsafe fn SWI_IRQ_1() {
+        crate::EXECUTOR.on_interrupt()
+    }
+
+    #[cfg(feature = "usb")]
+    pub mod usb {
+        use embassy_rp::peripherals;
+        use embassy_rp::usb::Driver;
+        pub type UsbDriver = Driver<'static, peripherals::USB>;
+        pub fn driver(usb: peripherals::USB) -> UsbDriver {
+            Driver::new(usb, super::Irqs)
+        }
+    }
 }
 
+#[cfg(context = "nrf52")]
+use nrf52 as arch;
+
 #[cfg(context = "rp2040")]
-#[interrupt]
-unsafe fn SWI_IRQ_1() {
-    EXECUTOR.on_interrupt()
+use rp2040 as arch;
+
+use arch::SWI;
+
+//
+// usb common start
+#[cfg(feature = "usb")]
+use arch::usb::UsbDriver;
+
+#[cfg(feature = "usb")]
+#[embassy_executor::task]
+async fn usb_task(mut device: UsbDevice<'static, UsbDriver>) -> ! {
+    device.run().await
+}
+// usb common end
+//
+
+#[cfg(feature = "net")]
+//
+// usb net begin
+#[cfg(feature = "net")]
+const MTU: usize = 1514;
+
+#[cfg(feature = "net")]
+use embassy_net::{Stack, StackResources};
+
+#[cfg(feature = "usb_ethernet")]
+use embassy_usb::class::cdc_ncm::embassy_net::{Device, Runner};
+
+#[cfg(feature = "usb_ethernet")]
+#[embassy_executor::task]
+async fn usb_ncm_task(class: Runner<'static, UsbDriver, MTU>) -> ! {
+    class.run().await
+}
+
+#[cfg(feature = "usb_ethernet")]
+#[embassy_executor::task]
+async fn net_task(stack: &'static Stack<Device<'static, MTU>>) -> ! {
+    stack.run().await
 }
+// usb net end
+//
 
-// #[cfg(context = "rp2040")]
-// #[embassy_executor::task]
-// async fn embassy_init(p: Peripherals) {
-//     use embassy_rp::uart::{Config, UartTx};
-//     use embassy_time::{Duration, Timer};
-//     let mut uart_tx = UartTx::new(p.UART0, p.PIN_0, p.DMA_CH0, Config::default());
+#[cfg(feature = "usb")]
+const fn usb_default_config() -> embassy_usb::Config<'static> {
+    // Create embassy-usb Config
+    let mut config = embassy_usb::Config::new(0xc0de, 0xcafe);
+    config.manufacturer = Some("Embassy");
+    config.product = Some("USB-Ethernet example");
+    config.serial_number = Some("12345678");
+    config.max_power = 100;
+    config.max_packet_size_0 = 64;
 
-//     loop {
-//         let data = b"hello\n";
-//         uart_tx.write(&data[..]).await.unwrap();
-//         Timer::after(Duration::from_secs(1)).await;
-//     }
-// }
+    // Required for Windows support.
+    config.composite_with_iads = true;
+    config.device_class = 0xEF;
+    config.device_sub_class = 0x02;
+    config.device_protocol = 0x01;
+    config
+}
 
 pub(crate) fn init() {
     riot_rs_rt::debug::println!("riot-rs-embassy::init()");
-    let _p = embassy_arch::init(Default::default());
-
+    let p = arch::init(Default::default());
     EXECUTOR.start(SWI);
-    // #[cfg(context = "rp2040")]
-    // {
-    //     EXECUTOR.spawner().spawn(embassy_init(_p)).unwrap();
-    // }
+
+    EXECUTOR.spawner().spawn(init_task(p)).unwrap();
+    riot_rs_rt::debug::println!("riot-rs-embassy::init() done");
+}
+
+#[embassy_executor::task]
+async fn init_task(peripherals: arch::Peripherals) {
+    riot_rs_rt::debug::println!("riot-rs-embassy::init_task()");
+    #[cfg(all(context = "nrf52", feature = "usb"))]
+    {
+        // nrf52840
+        let clock: embassy_nrf::pac::CLOCK = unsafe { core::mem::transmute(()) };
+
+        riot_rs_rt::debug::println!("nrf: enabling ext hfosc...");
+        clock.tasks_hfclkstart.write(|w| unsafe { w.bits(1) });
+        while clock.events_hfclkstarted.read().bits() != 1 {}
+    }
+
+    #[cfg(feature = "usb")]
+    let mut usb_builder = {
+        let usb_config = usb_default_config();
+
+        #[cfg(context = "nrf52")]
+        let usb_driver = nrf52::usb::driver(peripherals.USBD);
+
+        #[cfg(context = "rp2040")]
+        let usb_driver = rp2040::usb::driver(peripherals.USB);
+
+        // Create embassy-usb DeviceBuilder using the driver and config.
+        let builder = Builder::new(
+            usb_driver,
+            usb_config,
+            &mut make_static!([0; 256])[..],
+            &mut make_static!([0; 256])[..],
+            &mut make_static!([0; 256])[..],
+            &mut make_static!([0; 128])[..],
+            &mut make_static!([0; 128])[..],
+        );
+
+        builder
+    };
+
+    // Our MAC addr.
+    #[cfg(feature = "usb_ethernet")]
+    let our_mac_addr = [0xCC, 0xCC, 0xCC, 0xCC, 0xCC, 0xCC];
+
+    #[cfg(feature = "usb_ethernet")]
+    let usb_cdc_ecm = {
+        // Host's MAC addr. This is the MAC the host "thinks" its USB-to-ethernet adapter has.
+        let host_mac_addr = [0x88, 0x88, 0x88, 0x88, 0x88, 0x88];
+
+        use embassy_usb::class::cdc_ncm::{CdcNcmClass, State};
+
+        // Create classes on the builder.
+        CdcNcmClass::new(
+            &mut usb_builder,
+            make_static!(State::new()),
+            host_mac_addr,
+            64,
+        )
+    };
+
+    let spawner = Spawner::for_current_executor().await;
+
+    #[cfg(feature = "usb")]
+    let usb = { usb_builder.build() };
+    #[cfg(feature = "usb")]
+    spawner.spawn(usb_task(usb)).unwrap();
+
+    #[cfg(feature = "usb_ethernet")]
+    let device = {
+        use embassy_usb::class::cdc_ncm::embassy_net::State as NetState;
+        let (runner, device) = usb_cdc_ecm
+            .into_embassy_net_device::<MTU, 4, 4>(make_static!(NetState::new()), our_mac_addr);
+
+        spawner.spawn(usb_ncm_task(runner)).unwrap();
+
+        device
+    };
+
+    #[cfg(feature = "usb_ethernet")]
+    {
+        // network stack
+        //let config = embassy_net::Config::dhcpv4(Default::default());
+        use embassy_net::{Ipv4Address, Ipv4Cidr};
+        let config = embassy_net::Config::ipv4_static(embassy_net::StaticConfigV4 {
+            address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 61), 24),
+            dns_servers: heapless::Vec::new(),
+            gateway: Some(Ipv4Address::new(10, 42, 0, 1)),
+        });
+
+        // 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);
+        let seed = 1234u64;
+
+        // Init network stack
+        let stack = &*make_static!(Stack::new(
+            device,
+            config,
+            make_static!(StackResources::<2>::new()),
+            seed
+        ));
+
+        spawner.spawn(net_task(stack)).unwrap();
+    }
+
+    riot_rs_rt::debug::println!("riot-rs-embassy::init_task() done");
 }
 
 use linkme::distributed_slice;
diff --git a/src/riot-rs-rt/Cargo.toml b/src/riot-rs-rt/Cargo.toml
index a8e0010ab..84488702c 100644
--- a/src/riot-rs-rt/Cargo.toml
+++ b/src/riot-rs-rt/Cargo.toml
@@ -8,16 +8,17 @@ edition = "2021"
 cfg-if = "1.0.0"
 
 [target.'cfg(context = "cortex-m")'.dependencies]
-cortex-m = { workspace = true, features = ["critical-section-single-core" ] }
+cortex-m = { workspace = true, features = ["critical-section-single-core"] }
 cortex-m-rt = { workspace = true }
 cortex-m-semihosting = { workspace = true, optional = true }
+portable-atomic = { version = "1.5.1", features = ["critical-section"] }
 riot-rs-threads = { path = "../riot-rs-threads", optional = true }
 rtt-target = { version = "0.4.0", optional = true }
 linkme.workspace = true
 
 [features]
-default = [ "threading" ]
-threading = [ "dep:riot-rs-threads" ]
+default = ["threading"]
+threading = ["dep:riot-rs-threads"]
 debug-console = []
 silent-panic = []
 
diff --git a/src/riot-rs-rt/src/lib.rs b/src/riot-rs-rt/src/lib.rs
index 1cb6d5e30..c65d7bdbc 100644
--- a/src/riot-rs-rt/src/lib.rs
+++ b/src/riot-rs-rt/src/lib.rs
@@ -42,7 +42,7 @@ pub use arch::benchmark;
 
 #[link_section = ".isr_stack"]
 #[used(linker)]
-static ISR_STACK: [u8; 1024] = [0u8; 1024];
+static ISR_STACK: [u8; 8 * 1024] = [0u8; 8 * 1024];
 
 #[panic_handler]
 fn panic(_info: &PanicInfo) -> ! {
diff --git a/src/riot-rs/Cargo.toml b/src/riot-rs/Cargo.toml
index 78b9f0876..c96421ad1 100644
--- a/src/riot-rs/Cargo.toml
+++ b/src/riot-rs/Cargo.toml
@@ -18,3 +18,6 @@ debug-console = [ "riot-rs-rt/debug-console" ]
 silent-panic = [ "riot-rs-rt/silent-panic" ]
 thread_info = [ "riot-rs-core/thread_info" ]
 time = [ "riot-rs-embassy/time" ]
+usb = [ "riot-rs-embassy/usb" ]
+net = [ "riot-rs-embassy/net" ]
+usb_ethernet = [ "riot-rs-embassy/usb_ethernet" ]