Initial commit

.cargo/config

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+[build]
+target = "thumbv6m-none-eabi"
+
+[target.thumbv6m-none-eabi]
+runner = "elf2uf2-rs -d"
+rustflags = [
+  "-C", "link-arg=-Tlink.x",
+]

.gitignore

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+target/
+Cargo.lock

Cargo.toml

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+[package]
+name = "pico-test"
+version = "0.1.0"
+edition = "2018"
+
+[dependencies]
+cortex-m = "0.7.4"
+embedded-hal = "0.2.7"
+embedded-time = "0.12.1"
+panic-halt = "0.2.0"
+rp-pico = "0.2.0"

build.rs

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+use std::env;
+use std::fs;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
+    fs::File::create(out_dir.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("memory.x"))
+        .unwrap();
+
+    println!("cargo:rustc-link-search={}", out_dir.display());
+    println!("cargo:rerun-if-changed=memory.x");
+}

memory.x

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+MEMORY
+{
+  BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
+  FLASH : ORIGIN = 0x10000100, LENGTH = 2048K - 0x100
+  RAM   : ORIGIN = 0x20000000, LENGTH = 264K
+}
+
+EXTERN(BOOT2_FIRMWARE)
+
+SECTIONS
+{
+  .boot2 ORIGIN(BOOT2) :
+  {
+    KEEP(*(.boot2));
+  } > BOOT2
+}
+INSERT BEFORE .text;

src/main.rs

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+#![no_std]
+#![no_main]
+
+use embedded_hal::digital::v2::OutputPin;
+
+use embedded_time::fixed_point::FixedPoint;
+
+use panic_halt as _;
+
+use rp_pico::Pins;
+use rp_pico::entry;
+use rp_pico::hal::{Clock, Sio, Watchdog, clocks::init_clocks_and_plls};
+use rp_pico::pac::{CorePeripherals, Peripherals};
+
+#[entry]
+fn main() -> ! {
+    let mut p = Peripherals::take().unwrap();
+    let cp = CorePeripherals::take().unwrap();
+
+    let mut watchdog = Watchdog::new(p.WATCHDOG);
+    let clocks = init_clocks_and_plls(
+        rp_pico::XOSC_CRYSTAL_FREQ,
+        p.XOSC,
+        p.CLOCKS,
+        p.PLL_SYS,
+        p.PLL_USB,
+        &mut p.RESETS,
+        &mut watchdog
+    ).ok().unwrap();
+
+    let sio = Sio::new(p.SIO);
+    let pins = Pins::new(
+        p.IO_BANK0,
+        p.PADS_BANK0,
+        sio.gpio_bank0,
+        &mut p.RESETS,
+    );
+
+    let mut led = pins.led.into_push_pull_output();
+    let mut delay = cortex_m::delay::Delay::new(cp.SYST, clocks.system_clock.freq().integer());
+
+    loop {
+        led.set_high().unwrap();
+        delay.delay_ms(500);
+        led.set_low().unwrap();
+        delay.delay_ms(500);
+    }
+}