Add gpiote port example.

examples/src/bin/gpiote_port.rs

@@ -0,0 +1,62 @@
+#![no_std]
+#![no_main]
+#![feature(type_alias_impl_trait)]
+
+#[path = "../example_common.rs"]
+mod example_common;
+use example_common::*;
+
+use core::mem;
+use cortex_m_rt::entry;
+use nrf52840_hal::gpio;
+
+use embassy::executor::{task, Executor};
+use embassy::util::Forever;
+use embassy_nrf::gpiote;
+
+async fn button(g: &gpiote::Gpiote, n: usize, pin: gpio::Pin<gpio::Input<gpio::PullUp>>) {
+    let ch = g.new_port_input(pin);
+
+    loop {
+        ch.wait(gpiote::PortInputPolarity::Low).await;
+        info!("Button {:?} pressed!", n);
+        ch.wait(gpiote::PortInputPolarity::High).await;
+        info!("Button {:?} released!", n);
+    }
+}
+
+#[task]
+async fn run() {
+    let p = unwrap!(embassy_nrf::pac::Peripherals::take());
+    let port0 = gpio::p0::Parts::new(p.P0);
+
+    let g = gpiote::Gpiote::new(p.GPIOTE);
+    info!(
+        "sizeof Signal<()> = {:usize}",
+        mem::size_of::<embassy::util::Signal<()>>()
+    );
+    info!("sizeof gpiote = {:usize}", mem::size_of::<gpiote::Gpiote>());
+
+    info!("Starting!");
+
+    let button1 = button(&g, 1, port0.p0_11.into_pullup_input().degrade());
+    let button2 = button(&g, 2, port0.p0_12.into_pullup_input().degrade());
+    let button3 = button(&g, 3, port0.p0_24.into_pullup_input().degrade());
+    let button4 = button(&g, 4, port0.p0_25.into_pullup_input().degrade());
+    futures::join!(button1, button2, button3, button4);
+}
+
+static EXECUTOR: Forever<Executor> = Forever::new();
+
+#[entry]
+fn main() -> ! {
+    info!("Hello World!");
+
+    let executor = EXECUTOR.put(Executor::new(cortex_m::asm::sev));
+    unwrap!(executor.spawn(run()));
+
+    loop {
+        executor.run();
+        cortex_m::asm::wfe();
+    }
+}