continue workshop

microbit-code/app/.cargo/config.toml

@@ -0,0 +1,15 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace nRF82840_xxAA with your chip as listed in `probe-rs chip list`
+runner = "probe-rs run --chip nRF52833_xxAA --allow-erase-all"
+
+rustflags = [
+  "-C", "link-arg=-Tlink.x", # use the cortex-m-rt linker script
+  "-C", "linker=flip-link", # adds stack overflow protection
+  "-C", "link-arg=-Tdefmt.x", # defmt support
+]
+
+[build]
+target = "thumbv7em-none-eabihf"
+
+[env]
+DEFMT_LOG = "info"

microbit-code/app/Cargo.toml

@@ -0,0 +1,32 @@
+[package]
+edition = "2024"
+name = "rust-app"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+publish = false
+
+[dependencies]
+embassy-executor = { version = "0.10.0", features = ["platform-cortex-m", "executor-thread", "executor-interrupt", "defmt"] }
+embassy-time = { version = "0.5.1", features = ["defmt", "defmt-timestamp-uptime"] }
+embassy-nrf = { version = "0.10.0", features = ["defmt", "nrf52833", "time-driver-rtc1", "unstable-pac", "time"] }
+
+defmt = "1.0.1"
+defmt-rtt = "1.0.0"
+
+cortex-m = { version = "0.7.6", features = ["inline-asm", "critical-section-single-core"] }
+cortex-m-rt = "0.7.0"
+panic-probe = { version = "1.0.0", features = ["print-defmt"] }
+embedded-hal = { version = "1.0" }
+embedded-hal-async = { version = "1.0" }
+embedded-hal-bus = { version = "0.3", features = ["async"] }
+embedded-io = { version = "0.7.1", features = ["defmt"]  }
+embedded-io-async = { version = "0.7.0", features = ["defmt"] }
+portable-atomic = "1"
+
+[profile.release]
+debug = 2
+
+[package.metadata.embassy]
+build = [
+  { target = "thumbv7em-none-eabi", artifact-dir = "out/examples/nrf52840" }
+]

microbit-code/app/build.rs

@@ -0,0 +1,31 @@
+//! 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");
+}

microbit-code/app/memory.x

@@ -0,0 +1,6 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  FLASH : ORIGIN = 0x00000000, LENGTH = 512K
+  RAM : ORIGIN = 0x20000000, LENGTH = 128K
+}

microbit-code/app/src/bin/blinky.rs

@@ -0,0 +1,33 @@
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embassy_time::Timer;
+use rust_app as _;
+
+use embassy_nrf::gpio::Output;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) -> ! {
+    let periphs = embassy_nrf::init(embassy_nrf::config::Config::default());
+
+    defmt::println!("-- microbit v2 Blinky application --");
+
+    let mut row1 = Output::new(
+        periphs.P0_21,
+        embassy_nrf::gpio::Level::Low,
+        embassy_nrf::gpio::OutputDrive::Standard,
+    );
+    let mut col1 = Output::new(
+        periphs.P0_28,
+        embassy_nrf::gpio::Level::Low,
+        embassy_nrf::gpio::OutputDrive::Standard,
+    );
+    row1.set_high();
+    col1.set_low();
+    loop {
+        defmt::debug!("blinking LED");
+        row1.toggle();
+        Timer::after_millis(1000).await;
+    }
+}

microbit-code/app/src/bin/hello.rs

@@ -0,0 +1,11 @@
+#![no_std]
+#![no_main]
+
+use rust_app as _;
+use embassy_executor::Spawner;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) -> ! {
+    defmt::info!("Hello, world!");
+    loop {}
+}

microbit-code/app/src/bin/uart-echo.rs

@@ -0,0 +1,47 @@
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embedded_io_async::Write;
+use rust_app as _;
+
+use embassy_nrf::{
+    peripherals,
+    uarte::{self, Baudrate},
+};
+embassy_nrf::bind_interrupts!(
+    struct Irqs {
+        UARTE0 => uarte::InterruptHandler<peripherals::UARTE0>;
+    }
+);
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) -> ! {
+    let periphs = embassy_nrf::init(embassy_nrf::config::Config::default());
+
+    defmt::println!("-- microbit v2 UART echo application --");
+    let mut uarte_config = uarte::Config::default();
+    uarte_config.baudrate = Baudrate::BAUD115200;
+
+    let uart = uarte::Uarte::new(
+        periphs.UARTE0,
+        periphs.P1_08,
+        periphs.P0_06,
+        Irqs,
+        uarte_config,
+    );
+    let (mut uart_tx, mut uart_rx) =
+        uart.split_with_idle(periphs.TIMER0, periphs.PPI_CH0, periphs.PPI_CH1);
+    let mut rx_buf: [u8; 64] = [0; 64];
+    loop {
+        match uart_rx.read_until_idle(&mut rx_buf).await {
+            Ok(read_bytes) => match uart_tx.write_all(&rx_buf[0..read_bytes]).await {
+                Ok(_) => {
+                    defmt::trace!("read {} bytes", &read_bytes);
+                }
+                Err(e) => defmt::error!("UART transmission error: {}", e),
+            },
+            Err(e) => defmt::error!("UART reception error: {}", e),
+        }
+    }
+}

microbit-code/app/src/lib.rs

@@ -0,0 +1,5 @@
+#![no_std]
+
+use defmt_rtt as _;
+use embassy_nrf as _;
+use panic_probe as _;