Compile starter project

.cargo/config.toml

@@ -0,0 +1,8 @@
+[build]
+target = "thumbv6m-none-eabi"
+
+[env]
+DEFMT_LOG = "debug"
+
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "elf2uf2-rs -d"

Cargo.toml

@@ -1,6 +1,22 @@
 [package]
-name = "pico"
+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"

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");
+}

flake.nix

@@ -16,13 +16,16 @@
     flake-utils.lib.eachDefaultSystem (system: let
       pkgs = nixpkgs.legacyPackages.${system};
       fenixPkgs = fenix.packages.${system};
-      craneLib = crane.mkLib pkgs;
+      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; [
-          fenixPkgs.rust-analyzer
           elf2uf2-rs
+          fenixPkgs.rust-analyzer
         ];
         RUST_SRC_PATH = "${fenixPkgs.complete.rust-src}/lib/rustlib/src/rust/library";
       };

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    */
+}

rust-toolchain.toml

@@ -0,0 +1,4 @@
+[toolchain]
+channel = "nightly"
+targets = ["thumbv6m-none-eabi"]
+profile = "complete"

src/main.rs

@@ -1,3 +1,84 @@
-fn main() {
-    println!("Hello, world!");
+#![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;
+    }
 }