stm32: add stm32u5 GPDMA, SPIv4 support, add HIL tests.

examples/stm32u5/src/bin/blinky.rs

@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use defmt_rtt as _;
+use embassy::executor::Spawner;
+use embassy::time::{Duration, Timer};
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_stm32::Peripherals;
+// global logger
+use panic_probe as _;
+
+#[embassy::main]
+async fn main(_spawner: Spawner, p: Peripherals) -> ! {
+    info!("Hello World!");
+
+    let mut led = Output::new(p.PH7, Level::Low, Speed::Medium);
+
+    loop {
+        defmt::info!("on!");
+        led.set_low();
+        Timer::after(Duration::from_millis(200)).await;
+
+        defmt::info!("off!");
+        led.set_high();
+        Timer::after(Duration::from_millis(200)).await;
+    }
+}