Merge pull request #2469 from embassy-rs/nrf51-basic-support

feat: add basic support for nRF51 chips to embassy-nrf

5 files changed, 89 insertions, 0 deletions

diff --git a/examples/nrf51/.cargo/config.toml b/examples/nrf51/.cargo/config.toml
new file mode 100644
index 000000000..1671f5db1
--- /dev/null
+++ b/examples/nrf51/.cargo/config.toml
@@ -0,0 +1,9 @@
+[target.'cfg(all(target_arch = "arm", target_os = "none"))']
+# replace nRF51422_xxAA with your chip as listed in `probe-rs chip list`
+runner = "probe-rs run --chip nRF51422_xxAA"
+
+[build]
+target = "thumbv6m-none-eabi"
+
+[env]
+DEFMT_LOG = "trace"
diff --git a/examples/nrf51/Cargo.toml b/examples/nrf51/Cargo.toml
new file mode 100644
index 000000000..d1e919a33
--- /dev/null
+++ b/examples/nrf51/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+edition = "2021"
+name = "embassy-nrf51-examples"
+version = "0.1.0"
+license = "MIT OR Apache-2.0"
+
+[dependencies]
+embassy-executor = { version = "0.5.0", path = "../../embassy-executor", features = ["task-arena-size-4096", "arch-cortex-m", "executor-thread", "executor-interrupt", "defmt", "integrated-timers"] }
+embassy-time = { version = "0.3.0", path = "../../embassy-time", features = ["defmt", "defmt-timestamp-uptime"] }
+embassy-nrf = { version = "0.1.0", path = "../../embassy-nrf", features = ["defmt", "nrf51", "time-driver-rtc1", "unstable-pac", "time", "rt"] }
+
+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"
+panic-probe = { version = "0.3", features = ["print-defmt"] }
+
+[profile.release]
+debug = 2
diff --git a/examples/nrf51/build.rs b/examples/nrf51/build.rs
new file mode 100644
index 000000000..30691aa97
--- /dev/null
+++ b/examples/nrf51/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");
+}
diff --git a/examples/nrf51/memory.x b/examples/nrf51/memory.x
new file mode 100644
index 000000000..98b3c792f
--- /dev/null
+++ b/examples/nrf51/memory.x
@@ -0,0 +1,5 @@
+MEMORY
+{
+  FLASH                    : ORIGIN = 0x00000000, LENGTH = 128K
+  RAM                      : ORIGIN = 0x20000000, LENGTH = 16K
+}
diff --git a/examples/nrf51/src/bin/blinky.rs b/examples/nrf51/src/bin/blinky.rs
new file mode 100644
index 000000000..7c12ffcbc
--- /dev/null
+++ b/examples/nrf51/src/bin/blinky.rs
@@ -0,0 +1,20 @@
+#![no_std]
+#![no_main]
+
+use embassy_executor::Spawner;
+use embassy_nrf::gpio::{Level, Output, OutputDrive};
+use embassy_time::Timer;
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_nrf::init(Default::default());
+    let mut led = Output::new(p.P0_21, Level::Low, OutputDrive::Standard);
+
+    loop {
+        led.set_high();
+        Timer::after_millis(300).await;
+        led.set_low();
+        Timer::after_millis(300).await;
+    }
+}