Add STM32U5 example.

examples/stm32u5/src/bin/boot.rs

@@ -0,0 +1,28 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use embassy_stm32::gpio::{Input, Pull};
+use embedded_hal::digital::v2::InputPin;
+use example_common::*;
+
+#[cortex_m_rt::entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    loop {}
+
+    //let p = embassy_stm32::init(Default::default());
+
+    //let button = Input::new(p.PC13, Pull::Up);
+
+    //loop {
+        //if unwrap!(button.is_high()) {
+            //info!("high");
+        //} else {
+            //info!("low");
+        //}
+    //}
+}

examples/stm32u5/src/example_common.rs

@@ -0,0 +1,17 @@
+#![macro_use]
+
+use defmt_rtt as _; // global logger
+use panic_probe as _;
+
+pub use defmt::*;
+
+use core::sync::atomic::{AtomicUsize, Ordering};
+
+defmt::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
+    }
+}