hrtim: fix example and auto adjust psc.

examples/stm32f334/src/bin/button.rs

@@ -0,0 +1,27 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+use defmt::*;
+use embassy_executor::Spawner;
+use embassy_stm32::gpio::{Level, Output, Speed};
+use embassy_time::{Duration, Timer};
+use {defmt_rtt as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    info!("Hello World!");
+
+    let p = embassy_stm32::init(Default::default());
+
+    let mut out1 = Output::new(p.PA8, Level::Low, Speed::High);
+
+    out1.set_high();
+    Timer::after(Duration::from_millis(500)).await;
+    out1.set_low();
+
+    Timer::after(Duration::from_millis(500)).await;
+    info!("end program");
+
+    cortex_m::asm::bkpt();
+}