Add microbit-null demo (#139)

* add microbit-null demo

* add microbit demo to CI and scripts

.github/workflows/build-demos-nostd.yml

···
       - name: Install thumbv8m target
         run: rustup target add thumbv8m.main-none-eabihf
       #
+      # microbit demos
+      #
+      - name: Build microbit Demos
+        working-directory: ./demos/microbit
+        run: cargo build --all
+      #
       # nRF52840 demos
       #
       - name: Build nRF52840 Demos

checkall.sh

···
 cargo check --manifest-path=./demos/shared-icd/Cargo.toml
 cargo check --manifest-path=./demos/shared-icd/Cargo.toml --target=thumbv7em-none-eabi
 cargo check --all --manifest-path=./demos/std/Cargo.toml
+cargo check --all --target=thumbv7em-none-eabi --manifest-path=./demos/microbit/Cargo.toml
 cargo check --all --target=thumbv7em-none-eabi --manifest-path=./demos/nrf52840/Cargo.toml
 cargo check --all --target=thumbv6m-none-eabi --manifest-path=./demos/rp2040/Cargo.toml
 cargo check --all --target=riscv32imac-unknown-none-elf --manifest-path=./demos/esp32c6/Cargo.toml

cleanall.sh

···
 cargo clean --manifest-path=./demos/shared-icd/Cargo.toml
 cargo clean --manifest-path=./demos/shared-icd/Cargo.toml
 cargo clean --manifest-path=./demos/std/Cargo.toml
+cargo clean --manifest-path=./demos/microbit/Cargo.toml
 cargo clean --manifest-path=./demos/nrf52840/Cargo.toml
 cargo clean --manifest-path=./demos/rp2040/Cargo.toml
 cargo clean --manifest-path=./demos/esp32c6/Cargo.toml

demos/README.md

···
 
 These are various demos that are currently used to showcase specific features, and in many cases, act as basic smoke tests that things are still working.
 
-The demos are split into separate cargo workspaces, one per target platform.
+The demos are split into separate cargo workspaces, one per target platform and/or board.
 
 Currently, there are demos for:
 
···
 * `esp32c6` - Applications for the ESP32-C6 platform, typically using the `ESP32-C6-DevKitC-1`
 * `rp2350` - Applications for the RP2350 platform, typically using a `Pico2` development board, with or without a debugger.
 * `rp2040` - Applications for the RP2040 platform, typically using a `Pico` development board, with or without a debugger.
+* `microbit` - Applications for the micro:bit v2 board (nrf52833), which has an included debugger.
 * `nrf52840` - Applications for the `nRF52840` platform, typically using an `nRF52840-DK`
 
 ## End to End Demos

demos/microbit/.cargo/config.toml

···
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-rs run --chip nrf52833_xxAA --protocol swd"
+
+[build]
+target = "thumbv7em-none-eabihf"
+
+[env]
+DEFMT_LOG = "debug"
+
+[unstable]
+build-std = ["core"]
+build-std-features = ["panic_immediate_abort"]

demos/microbit/Cargo.lock

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demos/microbit/Cargo.toml

···
+[workspace]
+members = [
+    "microbit-null",
+]
+resolver = "2"
+
+[workspace.dependencies]
+ergot   = { path = "../../crates/ergot", features = ["embassy-usb-v0_5"] }
+
+bbq2                = { version = "0.4.1", default-features = false, features = ["critical-section", "maitake-sync-0_2"] }
+cortex-m            = { version = "0.7.7", features = ["inline-asm", "critical-section-single-core"] }
+embassy-executor    = { version = "0.7.0", features = ["task-arena-size-32768", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt"] }
+embassy-nrf         = { version = "0.5.0", features = ["defmt", "nrf52833", "time-driver-rtc1", "gpiote", "unstable-pac", "time"] }
+embassy-time        = { version = "0.4.0", features = ["defmt", "defmt-timestamp-uptime"] }
+mutex               = { version = "1.0.2", features = ["impl-unsafe-cortex-m-single-core"] }
+panic-probe         = { version = "1.0.0", features = ["print-defmt"] }
+
+cortex-m-rt     = "0.7.5"
+defmt           = "1.0.1"
+defmt-rtt       = "1.0.0"
+static_cell     = "2.1.1"
+embassy-usb     = "0.5.0"
+embassy-sync    = "0.7.0"
+
+[profile.release]
+debug = 2
+lto = true
+opt-level = 'z'
+codegen-units = 1
+incremental = false
+
+[profile.ci]
+inherits = "dev"
+debug = false
+strip = true
+debug-assertions = true
+overflow-checks = true
+lto = false
+panic = 'unwind'
+incremental = false
+codegen-units = 256
+rpath = false

demos/microbit/README.md

···
+# Ergot demos for the micro:bit v2
+
+These demos show how to use ergot on the micro:bit v2, which uses the nrf52833 chip. 
+The demos are similar to the nrf52840 ones, but adopting to the different hardware
+and specific to this board, which you might already have laying around.
+
+No board support crate is used, and we drive the hardware, for simplicity, directly with `embassy_nrf`.
+
+This demos are board specific to provide the simplest possible starting experience
+utilizing a low-cost and widely available board. 
+In that spirit, code comments are sprinkled throughout more extensively than usual.
+
+To run these demos, you need a micro:bit v2 board, a USB cable, and [probe-rs](https://probe.rs/).
+A good summary of how to get started with Rust and the micro:bit v2 is available in the 
+[Embedded Rust Discovery Book](https://docs.rust-embedded.org/discovery-mb2/index.html).
+
+## Demos currently implemented:
+
+- `microbit-null`: A minimal demo that does not communicate with the outside world. 
+  Message passing between tasks is implemented with ergot. After loading, press the two buttons and/or 
+  the touch logo to see some LEDs light up.
+
+## Further information:
+
+- [micro:bit Circuit Schematics, assembly and test point map](https://tech.microbit.org/hardware/schematic/)
+- [micro:bit Hardware schematic](https://github.com/microbit-foundation/microbit-v2-hardware)

demos/microbit/microbit-null/Cargo.toml

···
+[package]
+name = "microbit-null"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+ergot               = { workspace = true }
+
+bbq2                = { workspace = true }
+cortex-m            = { workspace = true }
+embassy-executor    = { workspace = true }
+embassy-nrf         = { workspace = true }
+embassy-time        = { workspace = true }
+mutex               = { workspace = true }
+panic-probe         = { workspace = true }
+
+cortex-m-rt         = { workspace = true }
+defmt               = { workspace = true }
+defmt-rtt           = { workspace = true }
+static_cell         = { workspace = true }
+embassy-usb         = { workspace = true }
+embassy-sync        = { workspace = true }

demos/microbit/microbit-null/build.rs

···
+//! 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");
+}

demos/microbit/microbit-null/memory.x

···
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  FLASH : ORIGIN = 0x00000000, LENGTH = 512K 
+  RAM : ORIGIN = 0x20000000, LENGTH = 128K
+}

demos/microbit/microbit-null/src/main.rs

···
+//! ergot null-interface demo for microbit
+
+#![no_std]
+#![no_main]
+
+use core::{mem, pin::pin};
+
+use defmt::info;
+use embassy_executor::{task, Spawner};
+use embassy_nrf::{
+    config::{Config as NrfConfig, HfclkSource},
+    gpio::{Input, Level, Output, OutputDrive, Pull},
+};
+use embassy_time::{Duration, WithTimeout};
+use ergot::{endpoint, interface_manager::profiles::null::Null, topic, Address, NetStack};
+use mutex::raw_impls::cs::CriticalSectionRawMutex;
+
+use {defmt_rtt as _, panic_probe as _};
+
+pub static STACK: NetStack<CriticalSectionRawMutex, Null> = NetStack::new();
+
+// Define an endpoint for toggling an LED and a topic for button presses
+endpoint!(LedEndpoint, bool, (), "led/set");
+topic!(ButtonPressedTopic, u8, "button/press");
+
+#[embassy_executor::main]
+async fn main(spawner: Spawner) {
+    // SYSTEM INIT
+    info!("Start");
+    let mut config = NrfConfig::default();
+    config.hfclk_source = HfclkSource::ExternalXtal;
+    let p = embassy_nrf::init(Default::default());
+
+    // Tasks continue running after main returns.
+
+    // Configure the LED pins that we use.
+    let led_pins = [
+        Output::new(p.P0_28, Level::High, OutputDrive::Standard), // LED col 1
+        Output::new(p.P0_31, Level::High, OutputDrive::Standard), // LED col 3
+        Output::new(p.P0_30, Level::High, OutputDrive::Standard), // LED col 5
+    ];
+
+    let led_names = ["LED1", "LED2", "LED3"];
+
+    // Put common anode to high and prevent it from being dropped when main returns.
+    let row3 = Output::new(p.P0_15, Level::High, OutputDrive::Standard);
+    mem::forget(row3);
+
+    // Configure the button pins that we use.
+    let btn_pins = [
+        Input::new(p.P0_14, Pull::Up),   // Button A = 1
+        Input::new(p.P1_04, Pull::None), // Touch Logo = 2, must be floating
+        Input::new(p.P0_23, Pull::Up),   // Button B = 3
+    ];
+
+    // Spawn the LED servers, which will toggle the LEDs when adequate messages are received.
+    for (name, led) in led_names.iter().zip(led_pins.into_iter()) {
+        spawner.must_spawn(led_server(name, led));
+    }
+
+    // Spawn the button workers, which will listen for button presses and message these events
+    for ((btn_idx, name), btn) in led_names.iter().enumerate().zip(btn_pins.into_iter()) {
+        // Note: the following `usize` to `u8` cast is safe, as we have only 3 buttons
+        spawner.must_spawn(button_worker(btn, name, (btn_idx + 1) as u8));
+    }
+
+    // Then start two tasks that just both listen and log every button press event
+    spawner.must_spawn(press_listener(1));
+    spawner.must_spawn(press_listener(2));
+}
+
+/// A task that listens to button press broadcast messages.
+///
+/// It subscribes to the `ButtonPressedTopic` and logs every message it receives.
+#[task(pool_size = 2)]
+async fn press_listener(idx: u8) {
+    // Declare and subscribe to the button pressed topic
+    let recv = STACK
+        .topics()
+        .bounded_receiver::<ButtonPressedTopic, 4>(None);
+    let recv = pin!(recv);
+    let mut recv = recv.subscribe();
+
+    loop {
+        // Now we wait for messages and log them when they arrive
+        let msg = recv.recv().await;
+        defmt::info!("Listener #{=u8}, button {=u8} pressed", idx, msg.t);
+    }
+}
+
+/// A task to run the LED server.
+///
+/// Creates a socket for the `LedEndpoint` and waits for the incoming messages.
+#[task(pool_size = 4)]
+async fn led_server(name: &'static str, mut led: Output<'static>) {
+    let socket = STACK
+        .endpoints()
+        .bounded_server::<LedEndpoint, 4>(Some(name));
+    let socket = pin!(socket);
+    let mut hdl = socket.attach();
+
+    loop {
+        let _ = hdl
+            .serve(async |on| {
+                defmt::info!("{=str} set {=bool}", name, *on);
+                if *on {
+                    led.set_low();
+                } else {
+                    led.set_high();
+                }
+            })
+            .await;
+    }
+}
+
+/// A task to handle button presses.
+///
+/// When a button is pressed, it sends a message to the corresponding `LedEndpoint` to turn the
+/// specific LED on/off. It also broadcasts a message to the `ButtonPressedTopic`.
+#[task(pool_size = 4)]
+async fn button_worker(mut btn: Input<'static>, name: &'static str, btn_idx: u8) {
+    // Create a client for the corresponding `LedENdpoint`.
+    let client = STACK
+        .endpoints()
+        .client::<LedEndpoint>(Address::unknown(), Some(name));
+    loop {
+        btn.wait_for_low().await;
+        let res = btn
+            .wait_for_high()
+            .with_timeout(Duration::from_millis(5))
+            .await;
+        if res.is_ok() {
+            continue;
+        }
+
+        // So the button was pressed, turn on the LED by sending a message...
+        client.request(&true).await.unwrap();
+        // ... and broadcast to the `ButtonPressedTopic`
+        let _ = STACK
+            .topics()
+            .broadcast::<ButtonPressedTopic>(&btn_idx, None);
+
+        btn.wait_for_high().await;
+        // Button released, turn off the LED
+        client.request(&false).await.unwrap();
+    }
+}

demos/microbit/rust-toolchain.toml

···
+[toolchain]
+targets = ["thumbv7em-none-eabihf"]

fmtall.sh

···
 # Format all the demo workspaces
 cargo fmt --manifest-path=./demos/shared-icd/Cargo.toml
 cargo fmt --all --manifest-path=./demos/std/Cargo.toml
+cargo fmt --all --manifest-path=./demos/microbit/Cargo.toml
 cargo fmt --all --manifest-path=./demos/nrf52840/Cargo.toml
 cargo fmt --all --manifest-path=./demos/rp2040/Cargo.toml
 cargo fmt --all --manifest-path=./demos/rp2350/Cargo.toml