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+ "semver-parser",
+]
+
+[[package]]
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+ "new_debug_unreachable",
+ "once_cell",
+ "parking_lot",
+ "phf_shared",
+ "precomputed-hash",
+]
+
+[[package]]
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+version = "0.11.1"
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+ "quote",
+ "unicode-ident",
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+ "quote",
+ "unicode-ident",
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+ "rustversion",
+ "winapi",
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+
+[[package]]
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+ "proc-macro2",
+ "quote",
+ "syn 2.0.79",
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+]
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+ "vcell",
+]
+
+[[package]]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
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+dependencies = [
+ "windows-sys 0.59.0",
+]
+
+[[package]]
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+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
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+ "windows-targets",
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+[[package]]
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+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
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+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
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+[[package]]
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+[[package]]
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+
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+
+[[package]]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a836a73
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "picow"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+cortex-m-rt = "*"
+cyw43 = "*"
+cyw43-pio = "*"
+defmt = "*"
+defmt-rtt = "*"
+embassy-executor = { version = "*", features = ["arch-cortex-m", "defmt", "executor-interrupt", "executor-thread", "integrated-timers"] }
+embassy-rp = { version = "*", features = ["critical-section-impl", "defmt", "time-driver"] }
+embassy-time = { version = "*", features = ["defmt", "defmt-timestamp-uptime"] }
+panic-probe = { version = "*", features = ["print-defmt"] }
+portable-atomic = { version = "*", features = ["critical-section"] }
+static_cell = "*"
+
+[profile.release]
+debug = 2
+lto = true
+opt-level = "z"
diff --git a/README.md b/README.md
index 8d23161..4bb93b1 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,12 @@
-# picow
+# Picow
+
+My first attempt on embedded system.
+
+## Hardware
+
+[Raspberry Pi Pico WH](https://www.raspberrypi.com/products/raspberry-pi-pico)
+
+## Software
+
+Rust [Embassy](https://embassy.dev/)
 
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..3f915f9
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,36 @@
+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    // By default, Cargo will re-run a build script whenever
+    // any file in the project changes. By specifying `memory.x`
+    // here, we ensure the build script is only re-run when
+    // `memory.x` is changed.
+    println!("cargo:rerun-if-changed=memory.x");
+
+    println!("cargo:rustc-link-arg-bins=--nmagic");
+    println!("cargo:rustc-link-arg-bins=-Tlink.x");
+    println!("cargo:rustc-link-arg-bins=-Tlink-rp.x");
+    println!("cargo:rustc-link-arg-bins=-Tdefmt.x");
+}
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..fe73c3e
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,130 @@
+{
+  "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1728344376,
+        "narHash": "sha256-lxTce2XE6mfJH8Zk6yBbqsbu9/jpwdymbSH5cCbiVOA=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "fd86b78f5f35f712c72147427b1eb81a9bd55d0b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "fenix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1728628307,
+        "narHash": "sha256-GRMRHZyU+R0RqKPFFgi7BBMDIRFPnHaAhOIxlqyvbZQ=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "b0a014d5b9dba793ebc205bcf12a93b5f6a4c66c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1726560853,
+        "narHash": "sha256-X6rJYSESBVr3hBoH0WbKE5KvhPU5bloyZ2L4K60/fPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c1dfcf08411b08f6b8615f7d8971a2bfa81d5e8a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1728492678,
+        "narHash": "sha256-9UTxR8eukdg+XZeHgxW5hQA9fIKHsKCdOIUycTryeVw=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "5633bcff0c6162b9e4b5f1264264611e950c8ec7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1728538411,
+        "narHash": "sha256-f0SBJz1eZ2yOuKUr5CA9BHULGXVSn6miBuUWdTyhUhU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b69de56fac8c2b6f8fd27f2eca01dcda8e0a4221",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "crane": "crane",
+        "fenix": "fenix",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs_2"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1728505432,
+        "narHash": "sha256-QFPMazeiGLo7AGy4RREmTgko0Quch/toMVKhGUjDEeo=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "0fb804acb375b02a3beeaceeb75b71969ef37b15",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..a36eb42
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,33 @@
+{
+  inputs = {
+    crane.url = "github:ipetkov/crane";
+    flake-utils.url = "github:numtide/flake-utils";
+    fenix.url = "github:nix-community/fenix";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  };
+
+  outputs = {
+    self,
+    crane,
+    fenix,
+    flake-utils,
+    nixpkgs,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      fenixPkgs = fenix.packages.${system};
+      fenixToolchain = fenixPkgs.fromToolchainFile {
+        dir = ./.;
+        sha256 = "sha256-HAFn+jo7K/dwbCKRHNXQU+x9b+8LJ8xlQGL/tE0rNlE=";
+      };
+      craneLib = (crane.mkLib pkgs).overrideToolchain fenixToolchain;
+    in {
+      devShells.default = craneLib.devShell {
+        packages = with pkgs; [
+          elf2uf2-rs
+          fenixPkgs.rust-analyzer
+        ];
+        RUST_SRC_PATH = "${fenixPkgs.complete.rust-src}/lib/rustlib/src/rust/library";
+      };
+    });
+}
diff --git a/memory.x b/memory.x
new file mode 100644
index 0000000..ef19dff
--- /dev/null
+++ b/memory.x
@@ -0,0 +1,17 @@
+MEMORY {
+    BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+    FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+
+    /* Pick one of the two options for RAM layout     */
+
+    /* OPTION A: Use all RAM banks as one big block   */
+    /* Reasonable, unless you are doing something     */
+    /* really particular with DMA or other concurrent */
+    /* access that would benefit from striping        */
+    RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+
+    /* OPTION B: Keep the unstriped sections separate */
+    /* RAM: ORIGIN = 0x20000000, LENGTH = 256K        */
+    /* SCRATCH_A: ORIGIN = 0x20040000, LENGTH = 4K    */
+    /* SCRATCH_B: ORIGIN = 0x20041000, LENGTH = 4K    */
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..8b139c5
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly"
+targets = ["thumbv6m-none-eabi"]
+profile = "complete"
diff --git a/src/firmware/43439A0.bin b/src/firmware/43439A0.bin
new file mode 100644
index 0000000..a05482f
Binary files /dev/null and b/src/firmware/43439A0.bin differ
diff --git a/src/firmware/43439A0_clm.bin b/src/firmware/43439A0_clm.bin
new file mode 100644
index 0000000..dc4ee02
Binary files /dev/null and b/src/firmware/43439A0_clm.bin differ
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..de0610a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,84 @@
+#![no_std]
+#![no_main]
+
+use cyw43_pio::PioSpi;
+use defmt::*;
+use defmt_rtt as _;
+use embassy_executor::Spawner;
+use embassy_rp::{
+    bind_interrupts,
+    gpio::{Level, Output},
+    peripherals::{DMA_CH0, PIO0},
+    pio::{InterruptHandler, Pio},
+};
+use embassy_time::Timer;
+use panic_probe as _;
+use static_cell::StaticCell;
+
+// bind interrupt request to handler
+bind_interrupts!(struct Irqs {
+   PIO0_IRQ_0 => InterruptHandler<PIO0>;
+});
+
+// network task
+#[embassy_executor::task]
+async fn cyw43_task(
+    runner: cyw43::Runner<'static, Output<'static>, PioSpi<'static, PIO0, 0, DMA_CH0>>,
+) -> ! {
+    runner.run().await
+}
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    // hardware abstraction layer
+    let hal = embassy_rp::init(Default::default());
+
+    // wireless firmware binary
+    let fw = include_bytes!("./firmware/43439A0.bin");
+
+    // wireless country locale matrix
+    let clm = include_bytes!("./firmware/43439A0_clm.bin");
+
+    // wireless power on signal
+    let pwr = Output::new(hal.PIN_23, Level::Low);
+
+    // wireless serial peripheral interface chip select
+    let cs = Output::new(hal.PIN_25, Level::High);
+
+    // programmed input/output
+    let mut pio = Pio::new(hal.PIO0, Irqs);
+
+    // programmed serial peripheral interface
+    let spi = PioSpi::new(
+        &mut pio.common,
+        pio.sm0,
+        pio.irq0,
+        cs,
+        hal.PIN_24,
+        hal.PIN_29,
+        hal.DMA_CH0,
+    );
+
+    // wireless driver state
+    static STATE: StaticCell<cyw43::State> = StaticCell::new();
+    let state = STATE.init(cyw43::State::new());
+
+    // spawn network task
+    let (_, mut control, runner) = cyw43::new(state, pwr, spi, fw).await;
+    unwrap!(spawner.spawn(cyw43_task(runner)));
+
+    // initialize wireless
+    control.init(clm).await;
+    control
+        .set_power_management(cyw43::PowerManagementMode::PowerSave)
+        .await;
+
+    // time to blink
+    let mut led = false;
+    loop {
+        info!("Blink!");
+        led = !led;
+        control.gpio_set(0, led).await;
+        Timer::after_secs(1).await;
+    }
+}