init repo

.cargo/config.toml

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+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+#runner = "probe-rs run --chip RP235x"
+#runner = "elf2uf2-rs -d"
+runner = "picotool load -u -v -x -t elf"
+
+[build]
+target = "thumbv8m.main-none-eabihf"
+
+[env]
+DEFMT_LOG = "debug"

.gitignore

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+/target

Cargo.toml

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+[package]
+edition = "2024"
+name = "my-led-tree"
+version = "0.1.0"
+publish = false
+
+[dependencies]
+embassy-embedded-hal = { version = "0.5.0", features = ["defmt"] }
+embassy-sync = { version = "0.7.2", features = ["defmt"] }
+embassy-executor = { version = "0.9.0", features = [
+  "arch-cortex-m",
+  "executor-thread",
+  "executor-interrupt",
+  "defmt",
+] }
+embassy-time = { version = "0.5.0", features = [
+  "defmt",
+  "defmt-timestamp-uptime",
+] }
+embassy-rp = { version = "0.9.0", features = [
+  "defmt",
+  "unstable-pac",
+  "time-driver",
+  "critical-section-impl",
+  "rp235xa",
+  "binary-info",
+] }
+embassy-futures = { version = "0.1.2" }
+
+defmt = "1.0.1"
+defmt-rtt = "1.0.0"
+
+cortex-m = { version = "0.7.6", features = ["inline-asm"] }
+cortex-m-rt = "0.7.0"
+panic-probe = { version = "1.0.0", features = ["print-defmt"] }
+
+embedded-hal-1 = { package = "embedded-hal", version = "1.0" }
+embedded-hal-async = "1.0"
+embedded-io-async = { version = "0.7.0", features = ["defmt"] }
+static_cell = "2.1"
+
+[profile.release]
+# Enable generation of debug symbols even on release builds
+debug = true
+
+[package.metadata.embassy]
+build = [{ target = "thumbv8m.main-none-eabihf" }]

build.rs

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+//! 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=-Tdefmt.x");
+}

memory.x

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+MEMORY {
+    /*
+     * The RP2350 has either external or internal flash.
+     *
+     * 2 MiB is a safe default here, although a Pico 2 has 4 MiB.
+     */
+    FLASH : ORIGIN = 0x10000000, LENGTH = 2048K
+    /*
+     * RAM consists of 8 banks, SRAM0-SRAM7, with a striped mapping.
+     * This is usually good for performance, as it distributes load on
+     * those banks evenly.
+     */
+    RAM : ORIGIN = 0x20000000, LENGTH = 512K
+    /*
+     * RAM banks 8 and 9 use a direct mapping. They can be used to have
+     * memory areas dedicated for some specific job, improving predictability
+     * of access times.
+     * Example: Separate stacks for core0 and core1.
+     */
+    SRAM8 : ORIGIN = 0x20080000, LENGTH = 4K
+    SRAM9 : ORIGIN = 0x20081000, LENGTH = 4K
+}
+
+SECTIONS {
+    /* ### Boot ROM info
+     *
+     * Goes after .vector_table, to keep it in the first 4K of flash
+     * where the Boot ROM (and picotool) can find it
+     */
+    .start_block : ALIGN(4)
+    {
+        __start_block_addr = .;
+        KEEP(*(.start_block));
+        KEEP(*(.boot_info));
+    } > FLASH
+
+} INSERT AFTER .vector_table;
+
+/* move .text to start /after/ the boot info */
+_stext = ADDR(.start_block) + SIZEOF(.start_block);
+
+SECTIONS {
+    /* ### Picotool 'Binary Info' Entries
+     *
+     * Picotool looks through this block (as we have pointers to it in our
+     * header) to find interesting information.
+     */
+    .bi_entries : ALIGN(4)
+    {
+        /* We put this in the header */
+        __bi_entries_start = .;
+        /* Here are the entries */
+        KEEP(*(.bi_entries));
+        /* Keep this block a nice round size */
+        . = ALIGN(4);
+        /* We put this in the header */
+        __bi_entries_end = .;
+    } > FLASH
+} INSERT AFTER .text;
+
+SECTIONS {
+    /* ### Boot ROM extra info
+     *
+     * Goes after everything in our program, so it can contain a signature.
+     */
+    .end_block : ALIGN(4)
+    {
+        __end_block_addr = .;
+        KEEP(*(.end_block));
+    } > FLASH
+
+} INSERT AFTER .uninit;
+
+PROVIDE(start_to_end = __end_block_addr - __start_block_addr);
+PROVIDE(end_to_start = __start_block_addr - __end_block_addr);

rust-toolchain.toml

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+[toolchain]
+channel = "1.92"
+components = [ "rust-src", "rustfmt", "llvm-tools" ]
+targets = [
+    "thumbv7em-none-eabi",
+    "thumbv7m-none-eabi",
+    "thumbv6m-none-eabi",
+    "thumbv7em-none-eabihf",
+    "thumbv8m.main-none-eabihf",
+    "riscv32imac-unknown-none-elf",
+    "wasm32-unknown-unknown",
+    "armv7a-none-eabi",
+    "armv7r-none-eabi",
+    "armv7r-none-eabihf",
+]

src/main.rs

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+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use {defmt_rtt as _, panic_probe as _};
+
+#[unsafe(link_section = ".bi_entries")]
+#[used]
+pub static PICOTOOL_ENTRIES: [embassy_rp::binary_info::EntryAddr; 4] = [
+    embassy_rp::binary_info::rp_program_name!(c"My LED tree"),
+    embassy_rp::binary_info::rp_program_description!(c"A LED tree control program"),
+    embassy_rp::binary_info::rp_cargo_version!(),
+    embassy_rp::binary_info::rp_program_build_attribute!(),
+];
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    let _ = embassy_rp::init(Default::default());
+}