imxrt: add button example

examples/mimxrt6/src/bin/button.rs

@@ -0,0 +1,29 @@
+#![no_std]
+#![no_main]
+
+use defmt::info;
+use embassy_executor::Spawner;
+use embassy_futures::select::{select, Either};
+use embassy_imxrt::gpio;
+use {defmt_rtt as _, embassy_imxrt_examples as _, panic_probe as _};
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    let p = embassy_imxrt::init(Default::default());
+
+    let mut user1 = gpio::Input::new(p.PIO1_1, gpio::Pull::None, gpio::Inverter::Disabled);
+    let mut user2 = gpio::Input::new(p.PIO0_10, gpio::Pull::None, gpio::Inverter::Disabled);
+
+    loop {
+        let res = select(user1.wait_for_falling_edge(), user2.wait_for_falling_edge()).await;
+
+        match res {
+            Either::First(()) => {
+                info!("Button `USER1' pressed");
+            }
+            Either::Second(()) => {
+                info!("Button `USER2' pressed");
+            }
+        }
+    }
+}