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Sebastian Hugentobler 2024-10-17 12:02:00 +02:00
commit c373ba5859
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GPG Key ID: BB32CF3CA052C2F0
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.cargo/config.toml Normal file
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[target.'cfg(all(target_arch = "arm", target_os = "none"))']
runner = "probe-rs run --chip nRF52833_xxAA --allow-erase-all"
linker = "flip-link"
[build]
target = "thumbv7em-none-eabihf"
[env]
DEFMT_LOG = "trace"

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.envrc Normal file
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use flake

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.gitignore vendored Normal file
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.direnv/
target/

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.vscode/launch.json vendored Normal file
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{
"version": "0.2.0",
"configurations": [
{
"type": "probe-rs-debug",
"request": "launch",
"name": "debug",
"cwd": "${workspaceFolder}",
"runtimeExecutable": "probe-rs",
"runtimeArgs": ["dap-server"],
"chip": "nRF52833_xxAA",
"flashingConfig": {
"flashingEnabled": true,
"haltAfterReset": false,
"formatOptions": {
"binaryFormat": "elf"
}
},
"coreConfigs": [
{
"coreIndex": 0,
"programBinary": "target/thumbv7em-none-eabihf/debug/micro-rust",
"svdFile": "nrf52833.svd"
}
],
"env": {
"RUST_LOG": "debug"
},
"consoleLogLevel": "Console"
}
]
}

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COPYING Normal file
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GNU GENERAL PUBLIC LICENSE
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version = "0.12.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "30713f36f1be02e5bc9abefa30eae4a1f943d810f199d4923d3ad062d1be1b3d"
dependencies = [
"cortex-m",
"cortex-m-rt",
"vcell",
]
[[package]]
name = "nrf5340-app-pac"
version = "0.12.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7c88824573cd150fe9f27c1a48cea31a8cb24d3322df488875775143618c087a"
dependencies = [
"cortex-m",
"cortex-m-rt",
"vcell",
]
[[package]]
name = "nrf5340-net-pac"
version = "0.12.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e5c03e44df22fe5888109fe42e523162c7059adf4d30860f4f73ecc8b1fc16fe"
dependencies = [
"cortex-m",
"cortex-m-rt",
"vcell",
]
[[package]]
name = "nrf9120-pac"
version = "0.12.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6c012f18dc278aa33741722d374bc84e3d2d7694e29745f0bb83e56b2d6faf9b"
dependencies = [
"cortex-m",
"cortex-m-rt",
"vcell",
]
[[package]]
name = "nrf9160-pac"
version = "0.12.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7344d74afb5684e00c48d175cad9619f36d629cfb0687d33b4d1bb86fba688f4"
dependencies = [
"cortex-m",
"cortex-m-rt",
"vcell",
]
[[package]]
name = "num-traits"
version = "0.2.19"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
dependencies = [
"autocfg",
]
[[package]]
name = "panic-probe"
version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4047d9235d1423d66cc97da7d07eddb54d4f154d6c13805c6d0793956f4f25b0"
dependencies = [
"cortex-m",
"defmt",
]
[[package]]
name = "pin-project-lite"
version = "0.2.14"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
[[package]]
name = "pin-utils"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
[[package]]
name = "proc-macro-error"
version = "1.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
dependencies = [
"proc-macro-error-attr",
"proc-macro2",
"quote",
"syn 1.0.109",
"version_check",
]
[[package]]
name = "proc-macro-error-attr"
version = "1.0.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
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"proc-macro2",
"quote",
"version_check",
]
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name = "proc-macro2"
version = "1.0.87"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"unicode-ident",
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name = "quote"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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"proc-macro2",
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name = "rand_core"
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dependencies = [
"semver",
]
[[package]]
name = "semver"
version = "0.9.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
dependencies = [
"semver-parser",
]
[[package]]
name = "semver-parser"
version = "0.7.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "388a1df253eca08550bef6c72392cfe7c30914bf41df5269b68cbd6ff8f570a3"
[[package]]
name = "stable_deref_trait"
version = "1.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
[[package]]
name = "strsim"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
[[package]]
name = "syn"
version = "1.0.109"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
dependencies = [
"proc-macro2",
"quote",
"unicode-ident",
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[[package]]
name = "syn"
version = "2.0.79"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "89132cd0bf050864e1d38dc3bbc07a0eb8e7530af26344d3d2bbbef83499f590"
dependencies = [
"proc-macro2",
"quote",
"unicode-ident",
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[[package]]
name = "thiserror"
version = "1.0.64"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d50af8abc119fb8bb6dbabcfa89656f46f84aa0ac7688088608076ad2b459a84"
dependencies = [
"thiserror-impl",
]
[[package]]
name = "thiserror-impl"
version = "1.0.64"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "08904e7672f5eb876eaaf87e0ce17857500934f4981c4a0ab2b4aa98baac7fc3"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.79",
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name = "typenum"
version = "1.17.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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name = "vcell"
version = "0.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "77439c1b53d2303b20d9459b1ade71a83c716e3f9c34f3228c00e6f185d6c002"
[[package]]
name = "version_check"
version = "0.9.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
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version = "1.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
[[package]]
name = "volatile-register"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "de437e2a6208b014ab52972a27e59b33fa2920d3e00fe05026167a1c509d19cc"
dependencies = [
"vcell",
]

45
Cargo.toml Normal file
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[workspace]
[package]
name = "micro-rust"
version = "0.1.0"
edition = "2021"
license = "GPL-3.0-or-later"
[dependencies.embassy-nrf]
version = "0.2.0"
git = "https://github.com/embassy-rs/embassy.git"
rev = "0ede8479dc4c6a58cfab0a5d4df41c0592405971"
features = ["defmt", "nrf52833", "nfc-pins-as-gpio", "time-driver-rtc1", "gpiote", "unstable-pac", "time"]
[dependencies.embassy-embedded-hal]
version = "0.2.0"
git = "https://github.com/embassy-rs/embassy.git"
rev = "0ede8479dc4c6a58cfab0a5d4df41c0592405971"
[dependencies.embassy-executor]
version = "0.6.0"
git = "https://github.com/embassy-rs/embassy.git"
rev = "0ede8479dc4c6a58cfab0a5d4df41c0592405971"
features = ["task-arena-size-32768", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt", "integrated-timers"]
[dependencies.embassy-time]
version = "0.3.2"
git = "https://github.com/embassy-rs/embassy.git"
rev = "0ede8479dc4c6a58cfab0a5d4df41c0592405971"
features = ["defmt", "defmt-timestamp-uptime"]
[dependencies.embassy-sync]
version = "0.6.0"
git = "https://github.com/embassy-rs/embassy.git"
rev = "cf0d227cca92a80e85575154d380d1ff73fb32cf"
[dependencies]
defmt = "0.3.8"
defmt-rtt = "0.4.1"
panic-probe = { version = "0.3.2", features = ["print-defmt"] }
cortex-m = { version = "0.7.7", features = ["inline-asm", "critical-section-single-core"] }
cortex-m-rt = "0.7.3"
embedded-hal-async = "1.0.0"

48
README.md Normal file
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# Micro-Rust
A sample project for [rust](https://www.rust-lang.org/) and
[embassy](https://embassy.dev/) on a [micro:bit](https://microbit.org/).
It uses the buttons to cycle through predefined led patterns.
![micro:bit with heart pattern](screenshot.jpg)
# Building
The recommended way is to use [nix](https://nixos.org/download/) with
[nix flakes](https://nixos.wiki/wiki/Flakes). It still is not for the faint of
heart but worth the investment.
Otherwise, [rustup](https://rustup.rs/) and other tools can be installed
manually.
## Nix
Install [nix](https://nixos.org/download/) and enable
[nix flakes](https://nixos.wiki/wiki/Flakes).
Enter the dev environment with `nix develop`. From there on the usual rust
commands work.
## Manual Way
Install [rustup](https://rustup.rs/), [probe-rs](https://probe.rs/) and
[flip-link](https://github.com/knurling-rs/flip-link). When running rust
commands (such as `cargo build`), rustup should pull in the specified toolchain.
# Usage
Connect the micro:bit to the computer and verify that it is listed when running
`probe-rs list`.
Using the normal `cargo run` command, will build the project, flash it onto the
microcontroller and run it.
Use the buttons to cycle through the different patterns.
# License
Licensed as [GPLv3](https://www.gnu.org/licenses/gpl-3.0.html) (apart from
[nrf52833.svd](nrf52833.svd) which is
[BSD-3-Clause](https://opensource.org/license/bsd-3-clause) and only used for
debugging).

35
build.rs Normal file
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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");
}

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flake.lock Normal file
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{
"nodes": {
"fenix": {
"inputs": {
"nixpkgs": "nixpkgs",
"rust-analyzer-src": "rust-analyzer-src"
},
"locked": {
"lastModified": 1728973961,
"narHash": "sha256-Jkqaw9O7WXTf5SHrK7xr9HpVU/mEPVg0Sp6s3AENC90=",
"owner": "nix-community",
"repo": "fenix",
"rev": "d6a9ff4d1e60c347a23bc96ccdb058d37a810541",
"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": 1728888510,
"narHash": "sha256-nsNdSldaAyu6PE3YUA+YQLqUDJh+gRbBooMMekZJwvI=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "a3c0b3b21515f74fd2665903d4ce6bc4dc81c77c",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-unstable",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"fenix": "fenix",
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs_2"
}
},
"rust-analyzer-src": {
"flake": false,
"locked": {
"lastModified": 1728921748,
"narHash": "sha256-BOCZ5osPOMh2BPHnkK4sVdTGj7sn47rBn1nxjrzWe5U=",
"owner": "rust-lang",
"repo": "rust-analyzer",
"rev": "0319586ef2a2636f6d6b891690b7ebebf4337c85",
"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
}

40
flake.nix Normal file
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{
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
flake-utils.url = "github:numtide/flake-utils";
fenix.url = "github:nix-community/fenix";
};
outputs =
{
nixpkgs,
fenix,
flake-utils,
...
}:
flake-utils.lib.eachDefaultSystem (
system:
let
pkgs = import nixpkgs { inherit system; };
rust =
with fenix.packages.${system};
fromToolchainFile {
file = ./rust-toolchain.toml;
sha256 = "sha256-VZZnlyP69+Y3crrLHQyJirqlHrTtGTsyiSnZB8jEvVo=";
};
in
{
devShells.default = pkgs.mkShell {
buildInputs = [
rust
pkgs.cargo-deny
pkgs.rust-analyzer
pkgs.probe-rs
pkgs.flip-link
pkgs.lldb_18
];
};
}
);
}

6
memory.x Normal file
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MEMORY
{
/* NOTE K = KiBi = 1024 bytes */
FLASH : ORIGIN = 0x00000000, LENGTH = 512K
RAM : ORIGIN = 0x20000000, LENGTH = 126K
}

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5
rust-toolchain.toml Normal file
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[toolchain]
channel = "stable"
components = [ "clippy", "rustfmt" ]
targets = [ "thumbv7em-none-eabi", "thumbv7em-none-eabihf" ]
profile = "minimal"

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35
src/buttons.rs Normal file
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//! micro:bit buttons to switch patterns.
use embassy_executor::{SpawnError, Spawner};
use embassy_nrf::gpio::{AnyPin, Input, Pull};
use crate::state;
/// Wait for a button press on the provided pin and then publish the provided message.
#[embassy_executor::task(pool_size = 2)]
async fn pattern_switch(button: AnyPin, pattern_move: state::StateChange) {
let mut button = Input::new(button, Pull::Up);
let state_pub = state::STATE.publisher().unwrap();
loop {
button.wait_for_low().await;
button.wait_for_high().await;
state_pub.publish_immediate(pattern_move);
}
}
/// Spawn tasks for the left and right button.
/// The left button sends a PatternLeft message, the right button a PatternRight.
pub fn spawn(
spawner: Spawner,
button_left: AnyPin,
button_right: AnyPin,
) -> Result<(), SpawnError> {
spawner.spawn(pattern_switch(button_left, state::StateChange::PatternLeft))?;
spawner.spawn(pattern_switch(
button_right,
state::StateChange::PatternRight,
))?;
Ok(())
}

84
src/leds.rs Normal file
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//! Driver for the micro:bit led display.
use embassy_nrf::gpio::{AnyPin, Level, Output, OutputDrive};
use embassy_time::Timer;
use crate::{patterns::PATTERN_START, state};
pub const ROWS: usize = 5;
pub const COLS: usize = 5;
pub type Matrix = [[u8; COLS]; ROWS];
pub struct Display<'a> {
rows: [Output<'a>; ROWS],
cols: [Output<'a>; COLS],
matrix: Matrix,
}
/// Create a low Output from an AnyPin instance.
fn pin_to_output<'a>(x: AnyPin) -> Output<'a> {
Output::new(x, Level::Low, OutputDrive::Standard)
}
impl<'a> Display<'a> {
/// Initialize the display with the provided pins.
pub fn new(rows: [AnyPin; ROWS], cols: [AnyPin; COLS]) -> Self {
let rows = rows.map(pin_to_output);
let cols = cols.map(pin_to_output);
Self {
rows,
cols,
matrix: [[0; COLS]; ROWS],
}
}
/// Set which leds are active.
pub fn set(&mut self, matrix: Matrix) {
self.matrix = matrix;
}
/// Show the defined pattern on the leds.
pub async fn show(&mut self) {
for (i, row) in self.matrix.iter().enumerate() {
self.rows[i].set_high();
for (j, cell) in row.iter().enumerate() {
if *cell > 0 {
self.cols[j].set_low();
}
}
// TODO: instead of waiting for a set time, try
// implementing some kind of constant refresh rate
Timer::after_micros(10).await;
for col in &mut self.cols {
col.set_high();
}
self.rows[i].set_low();
}
}
}
/// Show the active pattern on the led screen.
/// React on new pattern messages by showing the new pattern.
#[embassy_executor::task]
pub async fn task(rows: [AnyPin; ROWS], cols: [AnyPin; COLS]) {
let mut state_sub = state::STATE.subscriber().unwrap();
let mut display = Display::new(rows, cols);
display.set(PATTERN_START);
loop {
if let Some(msg) = state_sub.try_next_message_pure() {
if let state::StateChange::Pattern(new_pattern) = msg {
display.set(new_pattern);
}
}
display.show().await;
Timer::after_micros(10).await;
}
}

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src/main.rs Normal file
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//! Show predefined patterns on the micro:bit led display and switch between them using its
//! buttons.
#![no_std]
#![no_main]
use embassy_executor::Spawner;
use embassy_nrf::gpio::Pin;
use {defmt_rtt as _, panic_probe as _};
mod buttons;
mod leds;
mod patterns;
mod state;
/// Setup the necessary micro:bit hardware and spawn the worker tasks.
#[embassy_executor::main]
async fn main(spawner: Spawner) {
let p = embassy_nrf::init(Default::default());
let rows = [
p.P0_21.degrade(),
p.P0_22.degrade(),
p.P0_15.degrade(),
p.P0_24.degrade(),
p.P0_19.degrade(),
];
let cols = [
p.P0_28.degrade(),
p.P0_11.degrade(),
p.P0_31.degrade(),
p.P1_05.degrade(),
p.P0_30.degrade(),
];
let button_left = p.P0_14.degrade();
let button_right = p.P0_23.degrade();
spawner
.spawn(state::task())
.expect("state task failed to start");
spawner
.spawn(leds::task(rows, cols))
.expect("led task failed to start");
buttons::spawn(spawner, button_left, button_right).expect("button task failed to start");
}

31
src/patterns.rs Normal file
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@ -0,0 +1,31 @@
//! Predefined patterns for the led display.
use crate::leds::Matrix;
pub const HEART: Matrix = [
[0, 1, 0, 1, 0],
[1, 1, 1, 1, 1],
[1, 1, 1, 1, 1],
[0, 1, 1, 1, 0],
[0, 0, 1, 0, 0],
];
pub const CIRCLE: Matrix = [
[0, 1, 1, 1, 0],
[1, 0, 0, 0, 1],
[1, 0, 0, 0, 1],
[1, 0, 0, 0, 1],
[0, 1, 1, 1, 0],
];
pub const CROSS: Matrix = [
[0, 0, 1, 0, 0],
[0, 0, 1, 0, 0],
[1, 1, 1, 1, 1],
[0, 0, 1, 0, 0],
[0, 0, 1, 0, 0],
];
pub const PATTERN_COUNT: usize = 3;
pub const PATTERN_START: Matrix = HEART;
pub const PATTERNS: [Matrix; PATTERN_COUNT] = [HEART, CIRCLE, CROSS];

87
src/state.rs Normal file
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//! Bare bones state with pubsub access.
//! For more ergonomic access it might be nice to allow clients to subscribe to only the parts they
//! are interested in instead of the whole thing.
use embassy_sync::{blocking_mutex::raw::CriticalSectionRawMutex, pubsub::PubSubChannel};
use crate::{
leds::Matrix,
patterns::{PATTERNS, PATTERN_COUNT},
};
pub struct State {
pattern_idx: usize,
patterns: [Matrix; PATTERN_COUNT],
}
impl Default for State {
fn default() -> Self {
Self {
pattern_idx: Default::default(),
patterns: PATTERNS,
}
}
}
impl State {
/// Switch to the next pattern on the left.
/// Wrap around to the last if it is already the first one.
pub fn pattern_left(&mut self) {
self.pattern_idx = if self.pattern_idx == 0 {
self.patterns.len() - 1
} else {
self.pattern_idx - 1
};
}
/// Switch to the next pattern on the right.
/// Wrap around to the first if it is already the last one.
pub fn pattern_right(&mut self) {
self.pattern_idx = if self.pattern_idx == self.patterns.len() - 1 {
0
} else {
self.pattern_idx + 1
};
}
/// Return the active patern.
pub fn pattern(&self) -> Matrix {
self.patterns[self.pattern_idx]
}
}
#[derive(Clone, Copy)]
pub enum StateChange {
/// Switch to the paatternon the left of the active one.
PatternLeft,
/// Switch to the paatternon the right of the active one.
PatternRight,
/// Publish a new active pattern.
Pattern(Matrix),
}
/// PubSub channel to listen to state changes and publish them as well.
pub static STATE: PubSubChannel<CriticalSectionRawMutex, StateChange, 4, 4, 4> =
PubSubChannel::new();
/// Subscribe to state change messages and update the state accordingly.
/// Publish when a new pattern is active.
#[embassy_executor::task]
pub async fn task() {
let mut state = State::default();
let state_pub = STATE.publisher().unwrap();
let mut state_sub = STATE.subscriber().unwrap();
loop {
let old_pattern = state.pattern();
match state_sub.next_message_pure().await {
StateChange::PatternLeft => state.pattern_left(),
StateChange::PatternRight => state.pattern_right(),
_ => (),
}
if old_pattern != state.pattern() {
state_pub.publish_immediate(StateChange::Pattern(state.pattern()));
}
}
}