[examples] Add examples for STM32F3

examples/stm32f3/src/bin/button.rs

@@ -0,0 +1,33 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use cortex_m_rt::entry;
+use embassy_stm32::gpio::{Input, Level, Output, Pull, Speed};
+use embedded_hal::digital::v2::{InputPin, OutputPin};
+use example_common::*;
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let p = embassy_stm32::init(Default::default());
+
+    let button = Input::new(p.PA0, Pull::Down);
+    let mut led1 = Output::new(p.PE9, Level::High, Speed::Low);
+    let mut led2 = Output::new(p.PE15, Level::High, Speed::Low);
+
+    loop {
+        if unwrap!(button.is_high()) {
+            info!("high");
+            unwrap!(led1.set_high());
+            unwrap!(led2.set_low());
+        } else {
+            info!("low");
+            unwrap!(led1.set_low());
+            unwrap!(led2.set_high());
+        }
+    }
+}