initial commit

src/lib.rs

@@ -0,0 +1,41 @@
+#![no_std]
+
+use core::sync::atomic::{AtomicUsize, Ordering};
+
+use defmt_rtt as _; // global logger
+
+// TODO(5) adjust HAL import
+// use some_hal as _; // memory layout
+
+#[defmt::timestamp]
+fn timestamp() -> u64 {
+    static COUNT: AtomicUsize = AtomicUsize::new(0);
+    // NOTE(no-CAS) `timestamps` runs with interrupts disabled
+    let n = COUNT.load(Ordering::Relaxed);
+    COUNT.store(n + 1, Ordering::Relaxed);
+    n as u64
+}
+
+#[panic_handler] // panicking behavior
+fn panic(info: &core::panic::PanicInfo) -> ! {
+    if let Some(loc) = info.location() {
+        defmt::error!(
+            "panicked at {:str}:{:u32}:{:u32}",
+            loc.file(),
+            loc.line(),
+            loc.column()
+        )
+    } else {
+        // no location info
+        defmt::error!("panicked")
+    }
+
+    exit()
+}
+
+/// Terminates the application and makes `probe-run` exit with exit-code = 0
+pub fn exit() -> ! {
+    loop {
+        cortex_m::asm::bkpt();
+    }
+}