9 files changed, 913 insertions, 0 deletions
diff --git a/examples/nrf52840_blinky/.cargo/config.toml b/examples/nrf52840_blinky/.cargo/config.toml
new file mode 100644
index 00000000..419b43aa
--- /dev/null
+++ b/examples/nrf52840_blinky/.cargo/config.toml
@@ -0,0 +1,18 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+runner = "probe-rs run --chip nRF52840_xxAA"
+
+rustflags = [
+  "-C", "linker=flip-link",
+  "-C", "link-arg=-Tlink.x",
+  "-C", "link-arg=-Tdefmt.x",
+  # This is needed if your flash or ram addresses are not aligned to 0x10000 in memory.x
+  # See https://github.com/rust-embedded/cortex-m-quickstart/pull/95
+  "-C", "link-arg=--nmagic",
+]
+
+[build]
+target = "thumbv7em-none-eabihf" # Cortex-M4F and Cortex-M7F (with FPU)
+
+[alias]
+rb = "run --bin"
+rrb = "run --release --bin"
diff --git a/examples/nrf52840_blinky/.gitignore b/examples/nrf52840_blinky/.gitignore
new file mode 100644
index 00000000..ea8c4bf7
--- /dev/null
+++ b/examples/nrf52840_blinky/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/examples/nrf52840_blinky/.vscode/settings.json b/examples/nrf52840_blinky/.vscode/settings.json
new file mode 100644
index 00000000..c684c242
--- /dev/null
+++ b/examples/nrf52840_blinky/.vscode/settings.json
@@ -0,0 +1,9 @@
+{
+    // override the default setting (`cargo check --all-targets`) which produces the following error
+    // "can't find crate for `test`" when the default compilation target is a no_std target
+    // with these changes RA will call `cargo check --bins` on save
+    "rust-analyzer.checkOnSave.allTargets": false,
+    "rust-analyzer.checkOnSave.extraArgs": [
+        "--bins"
+    ]
+}
diff --git a/examples/nrf52840_blinky/Cargo.lock b/examples/nrf52840_blinky/Cargo.lock
new file mode 100644
index 00000000..a3d75427
--- /dev/null
+++ b/examples/nrf52840_blinky/Cargo.lock
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diff --git a/examples/nrf52840_blinky/Cargo.toml b/examples/nrf52840_blinky/Cargo.toml
new file mode 100644
index 00000000..8b136493
--- /dev/null
+++ b/examples/nrf52840_blinky/Cargo.toml
@@ -0,0 +1,68 @@
+[package]
+authors = ["Finomnis <finomnis@gmail.com>"]
+name = "nrf52840-blinky"
+edition = "2021"
+version = "0.1.0"
+
+[workspace]
+
+[lib]
+harness = false
+
+[dependencies]
+cortex-m = { version = "0.7", features = ["critical-section-single-core"] }
+cortex-m-rt = "0.7"
+defmt = "0.3"
+defmt-rtt = "0.4"
+panic-probe = { version = "0.3", features = ["print-defmt"] }
+cortex-m-semihosting = "0.5.0"
+nrf52840-hal = "0.16.0"
+fugit = { version = "0.3.7", features = ["defmt"] }
+
+[dependencies.rtic]
+path = "../../rtic"
+version = "2.0.1"
+features = ["thumbv7-backend"]
+
+[dependencies.rtic-monotonics]
+path = "../../rtic-monotonics"
+version = "1.4.0"
+features = ["nrf52840"]
+
+# cargo build/run
+[profile.dev]
+codegen-units = 1
+debug = 2
+debug-assertions = true # <-
+incremental = false
+opt-level = 'z'         # <-
+overflow-checks = true  # <-
+
+# cargo test
+[profile.test]
+codegen-units = 1
+debug = 2
+debug-assertions = true # <-
+incremental = false
+opt-level = 3           # <-
+overflow-checks = true  # <-
+
+# cargo build/run --release
+[profile.release]
+codegen-units = 1
+debug = 2
+debug-assertions = false # <-
+incremental = false
+lto = 'fat'
+opt-level = 3            # <-
+overflow-checks = false  # <-
+
+# cargo test --release
+[profile.bench]
+codegen-units = 1
+debug = 2
+debug-assertions = false # <-
+incremental = false
+lto = 'fat'
+opt-level = 3            # <-
+overflow-checks = false  # <-
diff --git a/examples/nrf52840_blinky/README.md b/examples/nrf52840_blinky/README.md
new file mode 100644
index 00000000..56eac32a
--- /dev/null
+++ b/examples/nrf52840_blinky/README.md
@@ -0,0 +1,33 @@
+# `nrf52840_blinky`
+
+An RTIC blinky example intended for [nrf52840-dongle].
+
+[nrf52840-dongle]: https://www.nordicsemi.com/Products/Development-hardware/nrf52840-dongle
+
+## Dependencies
+
+#### 1. `flip-link`:
+
+```console
+$ cargo install flip-link
+```
+
+#### 2. `probe-rs`:
+
+``` console
+$ # make sure to install v0.2.0 or later
+$ cargo install probe-rs --features cli
+```
+
+
+## Run
+
+The [nrf52840-dongle] needs to be connected to the computer via an SWD probe, like a [J-Link EDU Mini].
+
+Then, run:
+
+```
+cargo run --release --bin blinky_timer
+```
+
+[J-Link EDU Mini]: https://www.segger.com/products/debug-probes/j-link/models/j-link-edu-mini/
diff --git a/examples/nrf52840_blinky/src/bin/blinky_rtc.rs b/examples/nrf52840_blinky/src/bin/blinky_rtc.rs
new file mode 100644
index 00000000..e515659e
--- /dev/null
+++ b/examples/nrf52840_blinky/src/bin/blinky_rtc.rs
@@ -0,0 +1,69 @@
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+#![feature(type_alias_impl_trait)]
+
+use nrf52840_blinky::hal;
+
+#[rtic::app(device = hal::pac, dispatchers = [SWI0_EGU0])]
+mod app {
+    use super::*;
+
+    use hal::gpio::{Level, Output, Pin, PushPull};
+    use hal::prelude::*;
+
+    use rtic_monotonics::nrf::rtc::Rtc0 as Mono;
+    use rtic_monotonics::nrf::rtc::*;
+    use rtic_monotonics::Monotonic;
+
+    #[shared]
+    struct Shared {}
+
+    #[local]
+    struct Local {
+        led: Pin<Output<PushPull>>,
+    }
+
+    #[init]
+    fn init(cx: init::Context) -> (Shared, Local) {
+        // Configure low frequency clock
+        hal::clocks::Clocks::new(cx.device.CLOCK).start_lfclk();
+
+        // Initialize Monotonic
+        let token = rtic_monotonics::create_nrf_rtc0_monotonic_token!();
+        Mono::start(cx.device.RTC0, token);
+
+        // Setup LED
+        let port0 = hal::gpio::p0::Parts::new(cx.device.P0);
+        let led = port0.p0_06.into_push_pull_output(Level::Low).degrade();
+
+        // Schedule the blinking task
+        blink::spawn().ok();
+
+        (Shared {}, Local { led })
+    }
+
+    #[task(local = [led])]
+    async fn blink(cx: blink::Context) {
+        let blink::LocalResources { led, .. } = cx.local;
+
+        let mut next_tick = Mono::now();
+        let mut blink_on = false;
+        loop {
+            let now = Mono::now();
+            let now_ms: fugit::SecsDurationU64 = now.duration_since_epoch().convert();
+            defmt::println!("Timer {} ({})", now_ms, now.ticks());
+
+            blink_on = !blink_on;
+            if blink_on {
+                led.set_high().unwrap();
+            } else {
+                led.set_low().unwrap();
+            }
+
+            next_tick += 1000.millis();
+            Mono::delay_until(next_tick).await;
+        }
+    }
+}
diff --git a/examples/nrf52840_blinky/src/bin/blinky_timer.rs b/examples/nrf52840_blinky/src/bin/blinky_timer.rs
new file mode 100644
index 00000000..53ccf4e7
--- /dev/null
+++ b/examples/nrf52840_blinky/src/bin/blinky_timer.rs
@@ -0,0 +1,66 @@
+#![deny(unsafe_code)]
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+#![feature(type_alias_impl_trait)]
+
+use nrf52840_blinky::hal;
+
+#[rtic::app(device = hal::pac, dispatchers = [SWI0_EGU0])]
+mod app {
+    use super::*;
+
+    use hal::gpio::{Level, Output, Pin, PushPull};
+    use hal::prelude::*;
+
+    use rtic_monotonics::nrf::timer::Timer0 as Mono;
+    use rtic_monotonics::nrf::timer::*;
+    use rtic_monotonics::Monotonic;
+
+    #[shared]
+    struct Shared {}
+
+    #[local]
+    struct Local {
+        led: Pin<Output<PushPull>>,
+    }
+
+    #[init]
+    fn init(cx: init::Context) -> (Shared, Local) {
+        // Initialize Monotonic
+        let token = rtic_monotonics::create_nrf_timer0_monotonic_token!();
+        Mono::start(cx.device.TIMER0, token);
+
+        // Setup LED
+        let port0 = hal::gpio::p0::Parts::new(cx.device.P0);
+        let led = port0.p0_06.into_push_pull_output(Level::Low).degrade();
+
+        // Schedule the blinking task
+        blink::spawn().ok();
+
+        (Shared {}, Local { led })
+    }
+
+    #[task(local = [led])]
+    async fn blink(cx: blink::Context) {
+        let blink::LocalResources { led, .. } = cx.local;
+
+        let mut next_tick = Mono::now();
+        let mut blink_on = false;
+        loop {
+            let now = Mono::now();
+            let now_ms: fugit::SecsDurationU64 = now.duration_since_epoch().convert();
+            defmt::println!("Timer {} ({})", now_ms, now.ticks());
+
+            blink_on = !blink_on;
+            if blink_on {
+                led.set_high().unwrap();
+            } else {
+                led.set_low().unwrap();
+            }
+
+            next_tick += 1000.millis();
+            Mono::delay_until(next_tick).await;
+        }
+    }
+}
diff --git a/examples/nrf52840_blinky/src/lib.rs b/examples/nrf52840_blinky/src/lib.rs
new file mode 100644
index 00000000..7795f2da
--- /dev/null
+++ b/examples/nrf52840_blinky/src/lib.rs
@@ -0,0 +1,37 @@
+#![no_main]
+#![no_std]
+
+use cortex_m_semihosting::debug;
+
+use defmt_rtt as _; // global logger
+
+pub use nrf52840_hal as hal; // memory layout
+
+use panic_probe as _;
+
+// same panicking *behavior* as `panic-probe` but doesn't print a panic message
+// this prevents the panic message being printed *twice* when `defmt::panic` is invoked
+#[defmt::panic_handler]
+fn panic() -> ! {
+    cortex_m::asm::udf()
+}
+
+/// Terminates the application and makes a semihosting-capable debug tool exit
+/// with status code 0.
+pub fn exit() -> ! {
+    loop {
+        debug::exit(debug::EXIT_SUCCESS);
+    }
+}
+
+/// Hardfault handler.
+///
+/// Terminates the application and makes a semihosting-capable debug tool exit
+/// with an error. This seems better than the default, which is to spin in a
+/// loop.
+#[cortex_m_rt::exception]
+unsafe fn HardFault(_frame: &cortex_m_rt::ExceptionFrame) -> ! {
+    loop {
+        debug::exit(debug::EXIT_FAILURE);
+    }
+}