Add RTIC example.

ci.sh

@@ -104,6 +104,7 @@ cargo batch  \
     --- build --release --manifest-path docs/modules/ROOT/examples/layer-by-layer/blinky-irq/Cargo.toml --target thumbv7em-none-eabi \
     --- build --release --manifest-path docs/modules/ROOT/examples/layer-by-layer/blinky-async/Cargo.toml --target thumbv7em-none-eabi \
     --- build --release --manifest-path examples/nrf52840/Cargo.toml --target thumbv7em-none-eabi --out-dir out/examples/nrf52840 \
+    --- build --release --manifest-path examples/nrf52840-rtic/Cargo.toml --target thumbv7em-none-eabi --out-dir out/examples/nrf52840-rtic \
     --- build --release --manifest-path examples/nrf5340/Cargo.toml --target thumbv8m.main-none-eabihf --out-dir out/examples/nrf5340 \
     --- build --release --manifest-path examples/rp/Cargo.toml --target thumbv6m-none-eabi --out-dir out/examples/rp \
     --- build --release --manifest-path examples/stm32f0/Cargo.toml --target thumbv6m-none-eabi --out-dir out/examples/stm32f0 \

examples/nrf52840-rtic/.cargo/config.toml

@@ -0,0 +1,9 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace nRF82840_xxAA with your chip as listed in `probe-rs-cli chip list`
+runner = "probe-rs-cli run --chip nRF52840_xxAA"
+
+[build]
+target = "thumbv7em-none-eabi"
+
+[env]
+DEFMT_LOG = "trace"

examples/nrf52840-rtic/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+edition = "2021"
+name = "embassy-nrf52840-rtic-examples"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+
+[dependencies]
+rtic = { version = "2", features = ["thumbv7-backend"] }
+
+embassy-futures = { version = "0.1.0", path = "../../embassy-futures" }
+embassy-sync = { version = "0.2.0", path = "../../embassy-sync", features = ["defmt"] }
+embassy-time = { version = "0.1.0", path = "../../embassy-time", features = ["nightly", "unstable-traits", "defmt", "defmt-timestamp-uptime", "generic-queue"] }
+embassy-nrf = { version = "0.1.0", path = "../../embassy-nrf", features = ["nightly", "unstable-traits", "defmt", "nrf52840", "time-driver-rtc1", "gpiote", "unstable-pac", "time"] }
+
+defmt = "0.3"
+defmt-rtt = "0.4"
+
+cortex-m = { version = "0.7.6", features = ["inline-asm", "critical-section-single-core"] }
+cortex-m-rt = "0.7.0"
+panic-probe = { version = "0.3", features = ["print-defmt"] }
+futures = { version = "0.3.17", default-features = false, features = ["async-await"] }

examples/nrf52840-rtic/build.rs

@@ -0,0 +1,35 @@
+//! 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");
+}

examples/nrf52840-rtic/memory.x

@@ -0,0 +1,7 @@
+MEMORY
+{
+  /* NOTE 1 K = 1 KiBi = 1024 bytes */
+  /* These values correspond to the NRF52840 with Softdevices S140 7.0.1 */
+  FLASH : ORIGIN = 0x00000000, LENGTH = 1024K
+  RAM : ORIGIN = 0x20000000, LENGTH = 256K
+}

examples/nrf52840-rtic/src/bin/blinky.rs

@@ -0,0 +1,43 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use {defmt_rtt as _, panic_probe as _};
+
+#[rtic::app(device = embassy_nrf, peripherals = false, dispatchers = [SWI0_EGU0, SWI1_EGU1])]
+mod app {
+    use defmt::info;
+    use embassy_nrf::gpio::{Level, Output, OutputDrive};
+    use embassy_nrf::peripherals;
+    use embassy_time::{Duration, Timer};
+
+    #[shared]
+    struct Shared {}
+
+    #[local]
+    struct Local {}
+
+    #[init]
+    fn init(_: init::Context) -> (Shared, Local) {
+        info!("Hello World!");
+
+        let p = embassy_nrf::init(Default::default());
+        blink::spawn(p.P0_13).map_err(|_| ()).unwrap();
+
+        (Shared {}, Local {})
+    }
+
+    #[task(priority = 1)]
+    async fn blink(_cx: blink::Context, pin: peripherals::P0_13) {
+        let mut led = Output::new(pin, Level::Low, OutputDrive::Standard);
+
+        loop {
+            info!("off!");
+            led.set_high();
+            Timer::after(Duration::from_millis(300)).await;
+            info!("on!");
+            led.set_low();
+            Timer::after(Duration::from_millis(300)).await;
+        }
+    }
+}